JPS60161778A - Sieve surface not clogged - Google Patents

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 本発明は、被篩分物の篩い分けに用いる振動篩の篩面の
改良に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the sieving surface of a vibrating sieve used for sieving a material to be sieved.

振動篩は目詰まりをよく起こし篩分効率が低下するので
、これを防止する技術が種々工夫されているが、決め手
となる技術は未だ開発されていない現状にある。Since vibrating sieves often become clogged and the sieving efficiency decreases, various techniques have been devised to prevent this, but the decisive technology has not yet been developed.

本発明者は、石炭の選炭、セメント工場や石灰石鉱山に
おける鉱石等の分級に関する永年の経験に基づき、色々
の篩面を試験的に、および実地に使用し、目詰まりの生
成機構の解明について種々研究を重ね、篩面の目詰まり
防止機能の重要な要素を発見し、目詰まりを起こさない
形状の篩面を開発した。Based on many years of experience in coal preparation and classification of ores in cement factories and limestone mines, the present inventor has used various sieve surfaces both experimentally and in practice, and has made various efforts to elucidate the clogging formation mechanism. Through repeated research, we discovered the important factors that prevent clogging of the sieve surface, and developed a sieve surface with a shape that prevents clogging.

本発明は、このような篩面を提供することを目的とする
ものである。The object of the present invention is to provide such a sieve surface.

ここに、篩面とは、金網などのようにワイヤを織ったも
の、打抜鉄板、バーグリズリ−、ラバースクリーンなど
、振動篩にその分級部として取り付けられるものをいう
。Here, the sieve surface refers to a material attached to the vibrating sieve as a classification section, such as a woven wire such as a wire mesh, a punched iron plate, a bar grizzly, or a rubber screen.

本発明の要旨とするところは、振動篩に取り付ける篩面
において、被部分物落下透過孔の形状が、三角形、四角
形、多角形、円形、楕円形、長円形のいづれかであって
、該被部分物落下透過孔の縁が被篩分物の進行方向前方
に倒れた形状をなすことを特徴とする目詰まりしない篩
面にある。The gist of the present invention is that on the sieve surface attached to the vibrating sieve, the shape of the object drop permeation hole is any one of triangular, quadrangular, polygonal, circular, oval, or oval, and the object The sieve surface is characterized in that the edges of the material falling through holes are tilted forward in the direction of movement of the material to be sieved.

本発明の篩面に類似した構成の篩面が実公昭４６−２９
４０．８に開示されているが、この篩面は本発明とは逆
に被篩分物の落下透過孔の縁が被篩分物進行方向後方に
倒れた形状をなしており、摩耗防止と取替とを容易にす
ることを特徴とする篩面であって、目詰まりの観点から
は最も目詰まりしやすいものである。A sieve surface having a structure similar to the sieve surface of the present invention was published in 1973-29.
40.8, but contrary to the present invention, this sieve surface has a shape in which the edges of the holes through which the material to be sieved falls are tilted backward in the direction of movement of the material to be sieved, which is effective for preventing wear. It is a sieve surface that is characterized by easy replacement, and from the viewpoint of clogging, it is the one that is most likely to become clogged.

第１図〜第３図は、篩面ｌの一個の落下透過孔２の被篩
分物の進行方向（矢印４）に沿う断面と、この落下透過
孔２に臨んで落下透過孔の縁５に接触している被篩分物
塊または粒子３との関係を示す模式的断面図で、第１図
は従来の篩面、第２図（ａ）、（ｂ）、第３図は本発明
に係る篩面である。Figures 1 to 3 show the cross section of one falling permeation hole 2 on the sieve surface l along the direction of movement of the material to be sieved (arrow 4), and the edge 5 of the falling permeation hole facing the falling permeation hole 2. FIG. 1 is a schematic cross-sectional view showing the relationship between the mass of material to be sieved or particles 3 in contact with the sieve surface, and FIG. 1 is a conventional sieve surface, and FIGS. This is the sieve surface related to.

第２図（ａ）、（ｂ）、第３図の場合は第１図の場合に
比し著しく目詰まりが少ない。In the cases of FIGS. 2(a), (b), and 3, clogging is significantly less than in the case of FIG. 1.

第１図では、被篩分物塊または粒子３が篩面の落下透過
孔の縁５にひっかかったとき、接触点６．７において接
触する。篩面ｌは矢印８の方向に振動し、被篩分物また
は粒子３は矢印９方向に加速度を与えられる。しかし接
触点６．７で落下透過孔の縁５に接している粒子は、落
下透過孔２を通過することも落下透過孔２から脱して前
進することもできない。In FIG. 1, when the mass or particles 3 to be sieved catch the edge 5 of the falling perforation in the sieve surface, they come into contact at a contact point 6.7. The sieve surface l vibrates in the direction of arrow 8, and the material or particles 3 to be sieved are accelerated in the direction of arrow 9. However, particles which are in contact with the edge 5 of the drop-through hole at the point of contact 6.7 cannot pass through the fall-through hole 2 nor can they escape from the fall-through hole 2 and move forward.

第２図（ａ）では被篩分物塊または粒子３が篩面の落下
透過孔の縁５にひっかかったとき、篩面の透過孔の縁部
５と接触点６ａ、７ａで接する。In FIG. 2(a), when the mass or particle 3 to be sieved is caught on the edge 5 of the falling permeation hole on the sieve surface, it comes into contact with the edge 5 of the permeation hole on the sieve surface at contact points 6a, 7a.

篩面１は矢印８の方向に振動するので、被篩分物塊また
は粒子３も矢印９の方向に加速度を受けて姿勢を変え、
篩面の落下透過孔を通って落下することになる。さらに
第２図（ｂ、）に示すように後方からの被篩分物３ａが
ひっかかった被篩分物塊または粒子３の頭をたたき、前
記した姿勢を変える作用をしているという要素もある。Since the sieve surface 1 vibrates in the direction of arrow 8, the mass or particles 3 to be sieved also receive acceleration in the direction of arrow 9 and change their posture.
It will fall through the drop permeation holes on the sieve surface. Furthermore, as shown in FIG. 2(b), there is also an element in which the sieved material 3a from the rear hits the head of the caught sieved material mass or particles 3, thereby changing the posture described above. .

第３図は本発明の篩面１において落下透過孔２を通過し
ない被篩分物３が落下透過孔の縁５にひっかかったとき
の状態を示すものである。第２図と同じように被篩分物
３は上下の接触点６ａ。FIG. 3 shows a state in which the material to be sieved 3 which does not pass through the falling permeation holes 2 on the sieve surface 1 of the present invention is caught on the edge 5 of the falling permeation holes. As in FIG. 2, the material to be sieved 3 has upper and lower contact points 6a.

７ａで落下透過孔の縁５と接しているので、篩から矢印
９方向の加速度を与えられたとき、この落下透過孔２か
ら抜は出して矢印４方向へ前進する。Since it is in contact with the edge 5 of the falling permeation hole at 7a, when acceleration in the direction of arrow 9 is applied from the sieve, the material is pulled out of the fall permeation hole 2 and moves forward in the direction of arrow 4.

このように本発明の篩面は、落下透過孔２が１、矢印４
で示す被篩分物の進行方向前方に倒れた縁５を持−って
いるので、目詰まりを起こしにくい。In this way, in the sieve surface of the present invention, the falling permeation hole 2 is 1 and the arrow 4 is
Since it has an edge 5 that is tilted forward in the direction of movement of the material to be sieved, as shown by , clogging is less likely to occur.

すなわち、第２図、第３図の場合被篩分物３は落下透過
孔の縁５と接融点６ａ、７ａで接しており、振動篩から
の振動力、篩面目体の二次振動力が接融点６’ａ、７ａ
を作用点として被篩分物３に作用し、このほか第２図（
ａ）図のように後方からの被篩分物３ａによってたたか
れる力も作用し、これらの力と自重との合力は複雑であ
るが、被篩分物に回転運動をもたらし、その姿勢を変え
させて、接融点６　ａ　、　−７ａがフリーとなり、結
局は第２図、第３図における矢印９で示した方向の運動
をすることとなり、篩面を透過しく第２図（ａ）、（ｂ
）３．あるいはとび出す（第３図）チャンスが与えられ
る。このことは、本発明の篩面を負荷運転状態から空運
転状態にしたとき、落下透過孔にはまり込んだ被篩分物
がたちまち抜けてしまう現象の観察からも明らかに認め
られる。That is, in the case of FIGS. 2 and 3, the material to be sieved 3 is in contact with the edge 5 of the falling permeation hole at the contact melting points 6a and 7a, and the vibration force from the vibrating sieve and the secondary vibration force of the phloem surface are Contact melting point 6'a, 7a
acts on the material to be sieved 3 using
a) As shown in the figure, the force hit by the material to be sieved 3a from behind also acts, and the resultant force of these forces and its own weight is complex, but it brings about rotational movement to the material to be sieved and changes its posture. As a result, the contact melting points 6a and -7a become free, and they end up moving in the direction shown by the arrow 9 in Figs. 2 and 3, transmitting through the sieve surface as shown in Figs. b
)3. Or you will be given a chance to jump out (Figure 3). This is clearly recognized from the observation that when the sieve surface of the present invention is changed from a loaded operating state to an idle operating state, the material to be sieved that has gotten stuck in the falling permeation holes immediately falls out.

第１図〜第３図では振動篩が矢印８方向に直線運動する
篩について説明したが、円運動または楕円連動する篩に
おいても上記の作用、効果は同様に現われる。Although the sieve in which the vibrating sieve moves linearly in the direction of arrow 8 has been described in FIGS. 1 to 3, the above-mentioned functions and effects are similarly obtained in the case of a sieve in which the vibrating sieve moves in a circular or elliptical manner.

本発明の篩面の落下透過孔の平面形状は三角形、四角形
、多角形、円形、楕円形、長円形のいづれかから適切に
選択することができる。The planar shape of the falling permeation holes on the sieve surface of the present invention can be appropriately selected from triangular, quadrangular, polygonal, circular, elliptical, and oval.

また、このような落下透過孔の縁部は、必ずしも被部分
物進行方向に直交するとは限らないが、少なくとも、被
部分物進行方向前方に倒れた形状であればよい。この倒
れ角の大きさは限定されないが、水平に対して真傾斜で
４５〜７０度が好適であり、直線振動をする篩では篩の
振動方向にほぼ沿う角度がよい。この傾斜は３０度程度
でも目詰り防止に効果があるが篩の透過量が減少し処理
量が少なくなった。Further, the edge of such a drop permeation hole does not necessarily have to be orthogonal to the traveling direction of the object, but may at least have a shape that falls forward in the traveling direction of the object. Although the size of this inclination angle is not limited, it is preferably 45 to 70 degrees as a true inclination with respect to the horizontal, and in the case of a sieve that vibrates in a straight line, an angle that substantially follows the vibration direction of the sieve is preferable. Although this inclination of about 30 degrees was effective in preventing clogging, the amount of permeation through the sieve was reduced, resulting in a decrease in throughput.

本発明の篩面の最も適切な一実施例としては、ｆ５４図
に部分平面図、そのｘ−ｘ矢視を第５図に示すように、
ｒＪＩｓ　Ｇ３３５１　エキスバンドメタルＪに示され
る形状と同様の篩面を、第４、図に示す矢印Ａ方向、Ｂ
方向、Ｃ方向、Ｄ方向を被部分物進行方向としたものが
よい。この実施例の篩面では、Ａ方向を被篩分物の進行
方向としたものが最も目詰まりを起こしにくく、Ｂ方向
、Ｃ方向が、これに次ぐ成績を示し、Ｄ方向を進行方向
としてもＢ方向、Ｃ方向、とほぼ同等の目詰まり防止効
果がある。ただしＡ方向、Ｂ方向、Ｃ方向と逆方向に被
篩分物を進行させたときは、目詰まりが著しい。The most suitable embodiment of the sieve surface of the present invention is as shown in FIG.
rJIs G3351 The sieve surface similar to the shape shown in Exband Metal J was
It is preferable that the direction, C direction, and D direction be the moving direction of the object. In the sieve surface of this example, the one with the A direction as the traveling direction of the material to be sieved is the least likely to cause clogging, the B direction and the C direction show the second highest results, and even with the D direction as the traveling direction. It has almost the same clogging prevention effect as in the B direction and C direction. However, when the material to be sieved is advanced in the direction opposite to the directions A, B, and C, clogging becomes significant.

次に本発明の実施例を用いた使用例を挙げてさらに具体
的に説明する。Next, a more specific explanation will be given by giving an example of use using the embodiment of the present invention.

この実施例は石灰石鉱山の石灰石の破砕、篩分工程中に
適用した一例である。第６図はフローシートを示し、−
次破砕された石灰石給鉱１１をクラッシャ１２で破砕し
、その破砕産物１３を振動篩１４に供給し、これを篩面
１５で篩分け、その網上産物１６はクラッシャ１２に戻
し、網下産物１７を得る。使用した振動篩１４はニュー
ロッドスクリーンと通称される水平篩で、４５度の直線
振動を篩面に与える。篩面は第７図に平面図を示すよう
に、幅Ｗ　＝　１．８　ｍ　、石灰石の進行方向ｌ（矢
印１８）に沿う長さＬ　＝　４．２　ｍ　テあり、第７
図のように２１．２２．２３．２４と４枚の篩面に分け
られ、各々その側部を篩枠に固定される。This example is an example in which the present invention was applied during the limestone crushing and sieving process in a limestone mine. Figure 6 shows the flow sheet, -
Next, the crushed limestone feed 11 is crushed by the crusher 12, and the crushed product 13 is supplied to the vibrating sieve 14, which is sieved by the sieve surface 15. The on-screen product 16 is returned to the crusher 12, and the under-screen product is Get 17. The vibrating sieve 14 used is a horizontal sieve commonly known as a New Rod screen, which applies linear vibration at 45 degrees to the sieve surface. As shown in the plan view in Fig. 7, the sieve surface has a width W = 1.8 m, a length L = 4.2 m along the limestone traveling direction l (arrow 18), and a seventh
As shown in the figure, it is divided into four sieve surfaces 21, 22, 23, and 24, and each side is fixed to a sieve frame.

この固定は第８図に例示するような通常の篩網の固定と
同様の態様で篩面２１〜２４の側部２５をばね２６を有
するボルト２７によって緊張金物２８を介して篩枠側板
２９に緊張固定した。また篩面２１〜２４は中間部を弾
性材料３０を介して篩枠に取付けられるが、その他は弾
性材料３１を介して下方から支持され、篩面自身が２次
振動をすることが許容されている。篩面の第７図の長さ
Ｌ方向の寸法は、篩面２１が０．６　ｍ、篩面２２゜２
３．２４はいづれも１．２ｍである。This fixing is done in the same manner as the fixation of a normal sieve screen as shown in FIG. The tension was fixed. In addition, the intermediate parts of the sieve surfaces 21 to 24 are attached to the sieve frame through an elastic material 30, but the rest of the sieve surfaces are supported from below through an elastic material 31, and the sieve surfaces themselves are allowed to undergo secondary vibration. There is. The length L direction of the sieve surface in FIG. 7 is 0.6 m for the sieve surface 21, and 22°2 for the sieve surface.
3.24 is all 1.2m.

篩面として種々のものを試験した結果は次のようであっ
た。The results of testing various sieve surfaces were as follows.

（イ）織り網＝２５ｍｍ×２５ｍｍの正方形の落下透過
孔をもつ普通織り網を使用したが、目詰まりが激しかっ
た。フラットトップ織りは素線の折れが発生しやすく、
目詰りの上に付着が発達し、網目が全くつぶれてしまう
。(a) Woven net = An ordinary woven net with 25 mm x 25 mm square falling holes was used, but it was severely clogged. Flat top weaving tends to cause wires to break,
Adhesion develops on top of the blockage and the mesh becomes completely collapsed.

（ロ）打抜鋼板も同様に目詰まりが多かった。(b) The punched steel plate also had a lot of clogging.

（ハ）ラバースクリーン：２５ｍｍＸ２５ｍｍの正方形
の開口を有するラバースクリーンは目詰まり防止、騒音
防止には効果を発揮したが、開口率が５０％以下と小さ
く、篩の処理量が低下した。また寿命の点でも満足でき
なかった。(c) Rubber screen: A rubber screen having square openings of 25 mm x 25 mm was effective in preventing clogging and noise, but the opening ratio was small at 50% or less, and the throughput of the sieve was reduced. Also, I was not satisfied with the lifespan.

（ニ）長方形篩目の線径１０ｍｍ、落下透過孔が２５ｍ
ｍＸ５０ｍｍのものは、目詰まりは織り網よりも少なか
ったが、篩下にサイズの大きい粒子が混入し、需要先か
らクレームが出た。(d) Rectangular sieve mesh wire diameter 10mm, falling penetration hole 25m
The m x 50 mm screen had less clogging than the woven screen, but large particles were mixed in at the bottom of the sieve, resulting in complaints from customers.

（ホ）ウレタンゴム製の篩面は耐摩耗性に欠は問題があ
った。(e) The sieve surface made of urethane rubber had a problem with a lack of wear resistance.

（へ）フラットウェーブスクリーンは目詰まりは少ない
が、素線が断線しやすく寿命が短く、また高価である。(f) Flat wave screens are less prone to clogging, but the wires tend to break and have a short lifespan, and are expensive.

（ト）本発明の実施例の第６図の篩面をＡ方向を進行方
向として用いたところ、目詰まりがほとんど皆無であっ
た。(g) When the sieve surface of the example of the present invention shown in FIG. 6 was used with direction A as the traveling direction, there was almost no clogging.

以上の（イ）〜（へ）の試験において、振動篩１５への
給鉱１３が、粘土等を含まない乾いた石灰石の場合でも
、各篩面はそれぞれ上記のように目詰まりを起こした。In the tests (a) to (f) above, even when the ore 13 fed to the vibrating sieve 15 was dry limestone containing no clay or the like, each sieve surface was clogged as described above.

粘土分を含みかつ水分を持つ石灰石では、石灰石自体の
目詰まりのほか、石灰石の周囲を粘土分で固化したよう
な状態の塊または粒子が目詰まりを起こし、この目詰ま
りした石灰石を取除くのに大変な時間と労力とを要した
。With limestone that contains clay and has water, not only the limestone itself can become clogged, but also the lumps or particles surrounding the limestone that are solidified with clay can cause clogging, and it is difficult to remove this clogged limestone. It took a lot of time and effort.

上記試験（ト）においては、本発明の好適な実施例とし
て、第６図に示す篩面を第５図に示す篩面２２，２３．
２４の位置に取り付けた。この篩面の落下透過孔の寸法
は対角長さで２５　ｍ　ｍ　Ｘ４６ｍｍ、ストランドの
寸法は第７図に示すようにＴ＝６．０ｍｍ、Ｓ＝５．０
ｍｍである。なお、この寸法は上記ＪＩＳ　Ｇ３３５１
に規定されている寸法とは異なるものである。In the above test (g), as a preferred embodiment of the present invention, the sieve surfaces shown in FIG.
It was installed at position 24. The dimensions of the falling permeation holes on the sieve surface are 25 mm x 46 mm in diagonal length, and the dimensions of the strands are T = 6.0 mm and S = 5.0 as shown in Figure 7.
It is mm. This dimension is based on JIS G3351 above.
The dimensions are different from those specified in .

篩面２１には従来の２５ｍｍＸ２５ｍｍの織網からなる
篩面を使用した。As the sieve surface 21, a conventional sieve surface made of a 25 mm x 25 mm woven mesh was used.

クラッシャラン最大粒径６０ｍｍで、２５　ｍ　ｍ篩下
７０〜７５％を含む石灰石１３を振動篩１４に供給した
場合、従来の篩面では目詰まりを起こすために、網上産
物１６に２５ｍｍ篩下の混入量が５０〜６０％あったの
が、本発明の篩面を使用した後はこれが９〜ｌＯ％に減
少し、給鉱１１は２２５Ｔ／ｈから２７０Ｔ／ｈに約２
０％上昇した。また篩面の目詰まりの掃除の必要がなく
なった。なお１本発明の実施例として用いた篩面は正方
形の篩目でないので、細長い石灰石が網下産物１７に混
入することは止むを得ないが、網下産物１７中の２５ｍ
ｍ篩上の混入量は１．３〜１．５％であった。When crushed limestone 13 with a crusher run maximum particle size of 60 mm and containing 70 to 75% of the 25 mm sieve area is fed to the vibrating sieve 14, the screen product 16 has a 25 mm sieve area of 70% to 75%, which causes clogging on the conventional sieve surface. The amount of contamination was 50-60%, but after using the sieve surface of the present invention, this decreased to 9-10%, and the feed ore 11 was reduced from 225 T/h to 270 T/h by about 2
It increased by 0%. Also, there is no need to clean the clogged sieve surface. Note that since the sieve surface used in the embodiment of the present invention does not have a square sieve mesh, it is unavoidable that elongated limestone is mixed into the sieve product 17.
The amount of contamination on the m-sieve was 1.3-1.5%.

上記実施例の本発明の篩面は例えばエキスバンドメタル
の製造方法と同様な冷間切地法によって製造することが
できる。またこのような製造方法によって篩目の寸法が
砂の篩分けに適した篩目のものも製作することができ、
このような篩面を篩分サイズ２．５　ｍ　ｍの砕石砂の
篩分けに用いた結果、正方形の織網に比し目詰まりが著
しく少なかった。The sieve surface of the present invention in the above embodiments can be manufactured, for example, by a cold cutting method similar to the method for manufacturing expanded metal. In addition, by using this manufacturing method, it is possible to manufacture a sieve whose mesh size is suitable for sieving sand.
When such a sieve surface was used to sieve crushed stone sand with a sieve size of 2.5 mm, clogging was significantly less than that of a square woven screen.

本発明の篩面はさらに次のような特徴がある。The sieve surface of the present invention further has the following features.

（１）開口率を大きく取ることができる。(1) The aperture ratio can be increased.

（２）エキスバンドメタルと同様の篩面はストランドが
一体となっているあで、織網や打抜網と異なり、篩面全
体が二次振動を起こし、目詰まり防止効果を向上させる
効果がある。(2) The sieve surface, similar to expanded metal, has integrated strands, and unlike woven or punched screens, the entire sieve surface causes secondary vibration, which improves the clogging prevention effect. be.

（３）手簡にも使用することができる。(3) It can be used easily.

【図面の簡単な説明】 第１図〜第３図は篩面の１個の落下透過孔における被被
篩分物の挙動を模式的に示す断面図、第４図は本発明の
実施例の篩面の部分平面図、第５図は第４図のｘ−ｘ矢
視断面図、第６図は篩分は試験のフローシート、第７図
は第６図の篩面の平面図、第８図は篩面の篩の側枠への
固定の態様を示す篩の横断面図である。 １・・・篩面　２・・・落下透過孔 ３・・・被篩分物 ４・・・被部分物進行方向を示す矢印 ５・・・落下透過孔の縁 ６．６ａ、７，７ａ・・・接触点 ８・・・振動方向を示す矢印 ９・・・加速度方向を示す矢印 １１・・・給鉱（石灰石） １２・・・クラッシャ　１３・・・破砕産物１４・・・
振動篩　１５・・・篩面 １６・・・網上産物　１７・・・網下産物１８・・・進
行方向を示す矢印 ２１．２２．．２３．２４・・・篩面 ２５・・・篩面の側部　２６・・・ばね２７・・・ポル
ト　２８・・・緊張金物２９・・・篩枠側板　３０．３
１・・・弾性材斜出　願　人　三菱鉱業セメント株式会
社代　理　人　弁理士　小　杉　佳　男 弁理士　齋　藤　和　則 第４図 Ｉ”Ｘ 第５図 第６図 １[Brief Description of the Drawings] Figs. 1 to 3 are cross-sectional views schematically showing the behavior of the material to be sieved in one falling permeation hole on the sieve surface, and Fig. 4 is a cross-sectional view schematically showing the behavior of the material to be sieved in one falling permeation hole on the sieve surface. A partial plan view of the sieve surface, FIG. 5 is a sectional view taken along the line x-x in FIG. 4, FIG. FIG. 8 is a cross-sectional view of the sieve showing how the sieve surface is fixed to the side frame of the sieve. 1... Sieve surface 2... Falling penetration hole 3... Material to be sieved 4... Arrow indicating direction of movement of material to be sieved 5... Edge of falling penetration hole 6.6a, 7, 7a. ...Contact point 8...Arrow 9 indicating the direction of vibration...Arrow 11 indicating the direction of acceleration...Feeding ore (limestone) 12...Crusher 13...Crushed product 14...
Vibrating sieve 15...Sieve surface 16...Product on the screen 17...Product under the screen 18...Arrow indicating direction of movement 21.22. ．． 23.24... Sieve surface 25... Side part of sieve surface 26... Spring 27... Porto 28... Tension hardware 29... Sieve frame side plate 30.3
1...Applicant for elastic material diagonal application Person: Mitsubishi Mining and Cement Co., Ltd. Agent Patent attorney: Yoshi Kosugi Male patent attorney: Kazunori Saito Figure 4 I”X Figure 5 Figure 6 Figure 1

Claims (1)

【特許請求の範囲】[Claims] ｌ　振動篩に取り付ける篩面において、被部分物落下透
過孔の形状が、三角形、四角形、多角形、円形、楕円形
、長円形のいづれかであって、該被部分物落下透過孔の
縁が被篩分物の進行方向前方に倒れた形状をなすことを
特徴とする目詰まりしない篩面。l On the sieve surface attached to the vibrating sieve, the shape of the object-falling hole is triangular, square, polygonal, circular, oval, or oval, and the edge of the object-falling hole is covered. A sieve surface that does not become clogged and is characterized by having a shape that is tilted forward in the direction of movement of the sieved material.