JP4729385B2 - Vibrating sieve device - Google Patents

Vibrating sieve device Download PDF

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JP4729385B2
JP4729385B2 JP2005323359A JP2005323359A JP4729385B2 JP 4729385 B2 JP4729385 B2 JP 4729385B2 JP 2005323359 A JP2005323359 A JP 2005323359A JP 2005323359 A JP2005323359 A JP 2005323359A JP 4729385 B2 JP4729385 B2 JP 4729385B2
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vibration
transmission rod
sieve
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JP2007130520A (en
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嘉則 神谷
英二 松本
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株式会社村上精機工作所
嘉則 神谷
英二 松本
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本発明は、粒体などを大きさで分別する振動ふるい装置に関し、とくに、２０〜１００μｍ程度の微粒子の分別に適した高周波振動によるふるい装置に関する。   The present invention relates to a vibration sieving apparatus that sorts particles and the like according to size, and more particularly, to a sieving apparatus using high-frequency vibration that is suitable for sorting fine particles of about 20 to 100 μm.

係る高周波振動によるふるい装置として、例えば、下記特許文献１に開示された構造のものがある。   As a sieving apparatus using such high-frequency vibration, for example, there is a structure disclosed in Patent Document 1 below.

この特許文献１に開示されたふるい装置は、ふるい網に振動伝達棒（共振伝達要素）を取り付け、この振動伝達棒を超音波変換器に結合された共振子と結合し、超音波変換器の共振に合わせて振動伝達棒を曲げ振動させて、ふるい網を振動させるようにしたものである。   In the sieving device disclosed in Patent Document 1, a vibration transmission rod (resonance transmission element) is attached to a sieving net, and the vibration transmission rod is coupled to a resonator coupled to an ultrasonic transducer. The vibration transmission rod is bent and vibrated in accordance with the resonance to vibrate the sieve net.

このように高周波振動によるふるい装置は従来より種々検討されているが、専ら振動伝達棒に曲げ振動を与える構造のものである。
特表平８−５０００５８号公報 As described above, various types of sieving devices using high-frequency vibration have been studied, but they are exclusively structured to give bending vibration to the vibration transmitting rod.
Japanese National Patent Publication No. 8-500058

しかし、振動伝達棒に単に曲げ振動を与える構造のものでは、ふるい網が上下方向にのみ振動するため、ふるい網に目詰まりが発生しやすいという問題がある。   However, in the structure that simply applies bending vibration to the vibration transmitting rod, the sieve mesh vibrates only in the vertical direction, and therefore there is a problem that the sieve mesh is likely to be clogged.

本発明の課題は、ふるい網に目詰まりが発生しにくい高周波振動によるふるい装置を提供することにある。   An object of the present invention is to provide a sieving device using high-frequency vibration that is less likely to cause clogging in the sieving screen.

本発明の振動ふるい装置は、ふるい枠に張られたふるい網と、ふるい網のふるい面に沿ってふるい網に固定された振動伝達棒と、振動伝達棒に結合されこの振動伝達棒にその軸方向に沿った高周波（２０〜５０ｋＨｚ程度）の縦振動を与える振動子とを備えたものである。前記振動伝達棒は１本の直線状の棒からなり、この振動伝達棒は、その基端側に固定された固定金具を、円形の板バネを介して前記振動子の前面金具に固定することにより、前記振動子の振動方向と前記振動伝達棒の軸方向とが一致するように前記振動子に結合されている。 The vibration sieving device of the present invention includes a sieve mesh stretched on a sieve frame, a vibration transmission rod fixed to the sieve mesh along the sieve surface of the sieve mesh, a shaft coupled to the vibration transmission rod and its axis. And a vibrator that provides longitudinal vibration of high frequency (about 20 to 50 kHz) along the direction. The vibration transmission rod is composed of a single linear rod, and the vibration transmission rod is configured to fix a fixing bracket fixed to a base end side thereof to a front metal fitting of the vibrator via a circular leaf spring. Thus, the vibration direction of the vibrator and the axial direction of the vibration transmission rod are coupled to the vibrator.

このように本発明では、ふるい網のふるい面に沿って固定された振動伝達棒に縦振動を与えることによって、ふるい網の目開きが微小な範囲で拡縮を繰り返し、これによってふるい網の目詰まりが防止される。   As described above, according to the present invention, by applying longitudinal vibration to the vibration transmission rod fixed along the sieve screen of the sieve mesh, the sieve mesh is repeatedly expanded and contracted in a minute range, thereby clogging the sieve mesh. Is prevented.

本発明によれば、ふるい網の目詰まりが防止されるので、ふるい装置の安定運転性が向上し、メンテナンスの手間も軽減される。   According to the present invention, clogging of the sieve screen is prevented, so that the stable operation of the sieve device is improved and the labor of maintenance is reduced.

本発明の実施の形態を具体的な実施例に基づいて説明する。   Embodiments of the present invention will be described based on specific examples.

図１は本発明の振動ふるい装置の実施例を示す断面図、図２は図１のＡ−Ａ断面図である。図３は図１における振動ふるい装置のフレームのみを示す。   FIG. 1 is a cross-sectional view showing an embodiment of the vibration sieving device of the present invention, and FIG. 2 is a cross-sectional view taken along line AA of FIG. FIG. 3 shows only the frame of the vibration sieving device in FIG.

振動ふるい装置のふるい網１はふるい枠２に張られ、フレーム３に取り付けられる。フレーム３の上側にはカバー４が取り付けられる。フレーム３には図２及び図３に示すように切欠き部が設けられ、この切欠き部にふるい枠２が取り付けられる。ふるい枠２とフレーム３との隙間は、接合面にシリコンコンパウンドを充填して密閉される。   The sieve screen 1 of the vibration sieving device is stretched on the sieve frame 2 and attached to the frame 3. A cover 4 is attached to the upper side of the frame 3. As shown in FIGS. 2 and 3, the frame 3 is provided with a notch, and the sieve frame 2 is attached to the notch. The gap between the sieving frame 2 and the frame 3 is sealed by filling the joint surface with silicon compound.

ふるい網１には、そのふるい面に沿って振動伝達棒７が接着剤にて固定される。振動伝達棒７の基端側にはネジ付き固定金具８が溶接にて固定され、ネジ付き固定金具８は円形板バネ５をはさんで振動子６の前面金具９にネジにて固定される。振動伝達棒７の先端側には上下左右に振動可能な板バネ１５の一端が溶接され、板バネ１５の他端はふるい枠２に溶接にて固定される。   A vibration transmission rod 7 is fixed to the sieve net 1 with an adhesive along the sieve surface. A threaded fixture 8 is fixed to the base end side of the vibration transmission rod 7 by welding, and the threaded fixture 8 is fixed to the front bracket 9 of the vibrator 6 with a screw across the circular leaf spring 5. . One end of a plate spring 15 that can vibrate vertically and horizontally is welded to the distal end side of the vibration transmission rod 7, and the other end of the plate spring 15 is fixed to the sieve frame 2 by welding.

一方、円形板バネ５の外側フランジ部分は、ふるい枠２に溶接された固定金具１０の加工されたフランジ面１１に押さえ板１２にてボルト締めされ、その外側はカバー１３にて密閉される。固定金具１０の先端側には、振動伝達棒７の外形に合わせて少しのギャップを持たせた開口を有する密閉板１６が取り付けられる。また、固定金具１０の下面側には流入した粒子を取り除くための開口部が設けられ、その開口部は常時は閉鎖板１７によって塞がれる。   On the other hand, the outer flange portion of the circular leaf spring 5 is bolted to the processed flange surface 11 of the fixing bracket 10 welded to the sieve frame 2 with a pressing plate 12, and the outside is sealed with a cover 13. A sealing plate 16 having an opening with a slight gap in accordance with the outer shape of the vibration transmitting rod 7 is attached to the front end side of the fixture 10. Further, an opening for removing the inflowing particles is provided on the lower surface side of the fixing metal 10, and the opening is normally closed by the closing plate 17.

以上の構成において、本発明の振動ふるい装置は、振動子６により振動伝達棒７に縦振動を与え、振動伝達棒７の固有の縦振動を利用してふるい網１の目開きの大きさを微小な範囲で反復的に拡縮させて粒子の通過を良くすることを特徴とするものである。また、ふるい網１の目開きの反復的な拡縮により粒体が上下方向に振動し、これに伴いふるい網１も上下方向に振動する。このように、本発明の振動ふるい装置では、ふるい網１に左右方向（水平方向）と上下方向（垂直方向）の振動を与えることでふるい効果が一段と高くなり、目詰まりも少なくなる。また、振動子６をふるい網１を囲むフレーム３とカバー４の外側に設けることができるので、ふるい網１部分に振動子を溶接固定する必要がなく、装置構成が簡単になる。   In the above configuration, the vibration sieving device of the present invention applies longitudinal vibration to the vibration transmission rod 7 by the vibrator 6 and uses the inherent longitudinal vibration of the vibration transmission rod 7 to increase the size of the mesh of the sieve mesh 1. It is characterized by improving the passage of particles by repeatedly expanding and contracting in a minute range. In addition, the particles vibrate in the vertical direction due to the repetitive expansion and contraction of the mesh of the sieve net 1, and accordingly, the sieve net 1 also vibrates in the vertical direction. As described above, in the vibration sieving apparatus of the present invention, the sieving effect is further enhanced by applying vibrations in the horizontal direction (horizontal direction) and the vertical direction (vertical direction) to the sieving net 1, and clogging is reduced. Further, since the vibrator 6 can be provided outside the frame 3 and the cover 4 surrounding the sieve mesh 1, it is not necessary to weld and fix the vibrator to the sieve mesh 1 portion, and the apparatus configuration is simplified.

図４は振動伝達棒７の形状例を示す説明図である。   FIG. 4 is an explanatory view showing an example of the shape of the vibration transmitting rod 7.

ここで、振動伝達棒の縦振動の固有振動数（周波数）ｆは、λを振動数係数、ｌを振動伝達棒の長さ、Ｅをヤング係数、ｇを重力加速度、ρを振動伝達棒の比重とすると、次式（１）で表わされる。
ｆ＝（λ／２πｌ）×（Ｅｇ／ρ）１／２ ・・・（１） Here, the natural frequency (frequency) f of the longitudinal vibration of the vibration transmission rod is λ is the frequency coefficient, l is the length of the vibration transmission rod, E is the Young's modulus, g is the gravitational acceleration, and ρ is the vibration transmission rod. Assuming specific gravity, it is represented by the following formula (1).
f = (λ / 2πl) × (Eg / ρ) 1/2 (1)

例えば、振動伝達棒をステンレスのような鋼製とした場合には、Ｅは２．１×１０６ｋｇ／ｃｍ２ 、ｇは９８０ｃｍ／ｓ２ 、ρは７．８５×１０−３ｋｇ／ｃｍ３ 、λは振動次数により、一次振動のときπ、二次振動のとき２π、三次振動のとき３π、ｎ次振動のときｎπであるから、振動伝達棒の縦振動の固有振動数ｆは、上式（１）に示すように、振動伝達棒の長さｌのみの関数となり、断面２次モーメントや質量に関係ないため振動子の固有振動数（周波数）に調整するのは比較的簡単である。
For example, when the vibration transmitting rod is made of steel such as stainless steel, E is 2.1 × 10 6 kg / cm 2 , g is 980 cm / s 2 , and ρ is 7.85 × 10 −3 kg / cm. 3 and λ are π in the case of primary vibration, 2π in the case of secondary vibration, 3π in the case of tertiary vibration, and nπ in the case of n-order vibration, depending on the vibration order. Therefore, the natural frequency f of the longitudinal vibration of the vibration transmitting rod is As shown in the above formula (1), it is a function of only the length l of the vibration transmission rod and is not related to the moment of inertia or mass of the cross section , so it is relatively easy to adjust to the natural frequency (frequency) of the vibrator. is there.

本発明の振動ふるい装置において、そのふるい効果を最大限に発揮するには、振動子６とこれに結合された振動伝達棒７との組み合わせにおいて生成可能な複数の縦振動の共振周波数のうち最大の振動加速度を出す共振周波数を選定し、この選定された共振周波数の共振電力を振動子６の圧電素子１４に供給するように運転する。   In the vibration sieving device of the present invention, in order to maximize the sieving effect, the maximum of the resonance frequencies of a plurality of longitudinal vibrations that can be generated by the combination of the vibrator 6 and the vibration transmitting rod 7 coupled thereto is the maximum. The resonance frequency for generating the vibration acceleration is selected, and the resonance power of the selected resonance frequency is supplied to the piezoelectric element 14 of the vibrator 6.

以下、この振動ふるい装置の運転方法の一例を説明する。   Hereinafter, an example of an operation method of the vibration sieving device will be described.

振動子６の圧電素子１４として周波数（固有振動数）が２７ｋＨｚのものを使用し、これに結合された振動伝達棒７との組み合わせで生成可能な複数の縦振動の共振周波数のうち圧電素子１４の周波数（２７ｋＨｚ）の近くで最大の振動加速度を発生する３０ｋＨｚの共振周波数を選ぶ。具体的には、図５に示すように、振動子６の圧電素子１２に周波数を変化させて共振電力を供給し、発生する振動加速度（ゲインＧ１に相当）を実測する。図５より、３０ｋＨｚで最大の振動加速度が得られていることがわかる。そして、圧電素子１４の３０ｋＨｚにおける静電容量に対応する共振インピーダンスを使用し、また、選定した共振周波数の微小変動（温度、電圧、負荷の変動分）に対し、安定な共振を保持するために、位相固定ループ形発振方式を適用し、選定された共振周波数の共振電力を振動子６の圧電素子１４に供給する。   A piezoelectric element 14 having a frequency (natural frequency) of 27 kHz is used as the piezoelectric element 14 of the vibrator 6, and the piezoelectric element 14 among a plurality of longitudinal vibration resonance frequencies that can be generated in combination with the vibration transmission rod 7 coupled thereto. A resonance frequency of 30 kHz that generates the maximum vibration acceleration near the frequency (27 kHz) is selected. Specifically, as shown in FIG. 5, the resonance power is supplied by changing the frequency to the piezoelectric element 12 of the vibrator 6, and the generated vibration acceleration (corresponding to the gain G1) is measured. FIG. 5 shows that the maximum vibration acceleration is obtained at 30 kHz. Then, the resonance impedance corresponding to the capacitance of the piezoelectric element 14 at 30 kHz is used, and in order to maintain a stable resonance with respect to the minute fluctuation (temperature, voltage, load fluctuation) of the selected resonance frequency. Then, the phase-locked loop oscillation method is applied, and the resonance power of the selected resonance frequency is supplied to the piezoelectric element 14 of the vibrator 6.

本発明は、各種の粒体のふるい分けに利用可能である。   The present invention can be used for sieving various particles.

本発明の振動ふるい装置の実施例を示す断面図である。It is sectional drawing which shows the Example of the vibration sieve apparatus of this invention. 図１のＡ−Ａ断面図である。It is AA sectional drawing of FIG. 図１における振動ふるい装置のフレームのみを示す。Only the frame of the vibrating screen device in FIG. 1 is shown. 振動伝達棒の形状例を示す説明図である。It is explanatory drawing which shows the example of a shape of a vibration transmission rod. 振動加速度の実測データを示す。The actual measurement data of vibration acceleration is shown.

符号の説明Explanation of symbols

１：ふるい網
２：ふるい枠
３：フレーム
４：カバー
５：円形板バネ
６：振動子
７：振動伝達棒
８：ネジ付き固定金具
９：振動子の前面金具
１０：固定金具
１１：フランジ面
１２：押さえ板
１３：カバー
１４：圧電素子
１５：板バネ
１６：密閉板
１７：閉鎖板 1: Sieve screen 2: Sieve frame 3: Frame 4: Cover 5: Circular leaf spring 6: Vibrator 7: Vibration transmission rod 8: Fixing bracket with screw 9: Front fitting of vibrator 10: Fixing fitting 11: Flange surface 12 : Press plate 13: Cover 14: Piezoelectric element 15: Plate spring 16: Sealing plate 17: Closing plate

Claims (1)

ふるい枠に張られたふるい網と、ふるい網のふるい面に沿ってふるい網に固定された振動伝達棒と、振動伝達棒に結合されこの振動伝達棒にその軸方向に沿った高周波の縦振動を与える振動子とを備えた振動ふるい装置において、
前記振動伝達棒は１本の直線状の棒からなり、この振動伝達棒は、その基端側に固定された固定金具を、円形の板バネを介して前記振動子の前面金具に固定することにより、前記振動子の振動方向と前記振動伝達棒の軸方向とが一致するように前記振動子に結合されていることを特徴とする振動ふるい装置。 A sieve mesh stretched on the sieve frame, a vibration transmission rod fixed to the sieve mesh along the sieve surface of the sieve mesh, and a high frequency longitudinal vibration along the axial direction of the vibration transmission rod coupled to the vibration transmission rod in vibrating screen apparatus having a vibrator that gives,
The vibration transmission rod is composed of a single linear rod, and the vibration transmission rod is configured to fix a fixing bracket fixed to a base end side thereof to a front metal fitting of the vibrator via a circular leaf spring. Thus, the vibration sieving apparatus is coupled to the vibrator so that the vibration direction of the vibrator and the axial direction of the vibration transmission rod coincide with each other.
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DE202011102752U1 (en) * 2011-07-04 2011-12-01 Artech Systems Ag Screen frame for ultrasonic sieve and ultrasonic sieve
JP5475078B2 (en) * 2012-09-11 2014-04-16 株式会社徳寿工作所 Circular vibration sieve device
CN105835113B (en) * 2016-05-04 2017-05-31 吉首大学 The bark of eucommia is peeled off two-stage screening conveying devices
CN109675810B (en) * 2019-03-01 2024-03-15 福建南方路面机械股份有限公司 Multistage combination screening equipment

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JPH08500058A (en) * 1993-05-26 1996-01-09 テルソニック、アクチェンゲゼルシャフト Equipment and methods for sieving, classifying, filtering, filtering or sizing substances
JP2002505954A (en) * 1998-03-11 2002-02-26 ドクトル ヒールシャー ゲーエムベーハー How to excite sieve frame with ultrasonic
JP2002108017A (en) * 2000-10-03 2002-04-10 Canon Inc Method for manufacturing toner
JP2006507934A (en) * 2002-12-02 2006-03-09 ラッセル・フィネックス・リミテッド Sieve

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