WO2024116312A1 - Electrostatic sorting device - Google Patents

Electrostatic sorting device Download PDF

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WO2024116312A1
WO2024116312A1 PCT/JP2022/044124 JP2022044124W WO2024116312A1 WO 2024116312 A1 WO2024116312 A1 WO 2024116312A1 JP 2022044124 W JP2022044124 W JP 2022044124W WO 2024116312 A1 WO2024116312 A1 WO 2024116312A1
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electrostatic
electric field
voltage electrode
sorting
electrode
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PCT/JP2022/044124
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French (fr)
Japanese (ja)
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保博 中村
康隆 稲永
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三菱電機株式会社
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Priority to JP2023519497A priority Critical patent/JP7301254B1/en
Priority to PCT/JP2022/044124 priority patent/WO2024116312A1/en
Publication of WO2024116312A1 publication Critical patent/WO2024116312A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C7/00—Separating solids from solids by electrostatic effect
    • B03C7/02—Separators
    • B03C7/12—Separators with material falling free

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  • This application relates to an electrostatic separation device.
  • This application discloses technology to solve the problems described above, and aims to provide an electrostatic sorting device that reduces the occurrence of corona discharge at both ends of the high-voltage electrodes, stabilizes sorting performance, and improves sorting efficiency.
  • the electrostatic separation device disclosed in the present application comprises: An electrostatic sorting device that forms an electrostatic field space between a ground electrode and a high-voltage electrode arranged opposite to each other, and sorts a plurality of sorting objects displaced by electrostatic force by passing the objects through the electrostatic field space,
  • the high-voltage electrode is provided at both ends with electric field mitigation portions each having a curved shape and larger than the both ends of the high-voltage electrode.
  • Corona discharge is less likely to occur at both ends of the high voltage electrode, which stabilizes sorting performance and improves sorting efficiency.
  • FIG. 1 is a schematic diagram showing a configuration of an electrostatic separation device according to a first embodiment.
  • FIG. FIG. 2 is an enlarged schematic view of a counter electrode portion of the electrostatic separation device shown in FIG. 1 .
  • FIG. 3 is an enlarged schematic view of a counter electrode portion of the electrostatic separation device shown in FIG. 2 .
  • Fig. 1 is a schematic diagram showing the configuration of an electrostatic separation device according to embodiment 1.
  • Fig. 2 is a schematic diagram showing an enlarged view of a counter electrode portion of the electrostatic separation device shown in Fig. 1.
  • Fig. 3 is a schematic diagram showing an enlarged view of the high-voltage electrode side of the electrostatic separation device shown in Fig. 2.
  • the electrostatic sorting device 10 electrostatically sorts flake-shaped sorting objects 100 that are a mixture of multiple types of materials.
  • the sorting objects 100 are, for example, a mixture of two types of material fragments, a mixture of positively charged resin 101 and negatively charged resin 102.
  • the electrostatic sorting device 10 includes a charging unit 12, a transport unit 13, an opposing electrode 17, and a collection container 14.
  • the charging unit 12 agitates the objects 100 to be sorted, causing frictional charging between the objects 100, and charging the positively charged resin 101 positively and the negatively charged resin 102 negatively.
  • the transport unit 13 transports the objects 100 to be sorted, which have been charged by the charging unit 12, to the electrostatic field space A, and is formed, for example, by a vibrating feeder, and is electrically grounded.
  • the opposing electrode 17 is configured with a ground electrode 3 and a high-voltage electrode 4 facing each other.
  • the distance between the ground electrode 3 and the high-voltage electrode 4 is arranged so that it gradually becomes wider from the conveying section 13 side to the collection container 14 side.
  • the ground electrode 3 is electrically grounded.
  • a positive high voltage for example, is applied to the high-voltage electrode 4 from the high-voltage power supply unit 11.
  • the high-voltage power supply unit 11 (see FIG. 2) connects a high-voltage cable to the side of the high-voltage electrode 4 opposite the ground electrode 3 with a screw to supply power.
  • the ground electrode 3 is arranged on the side close to the conveying section 13 and the charging section 12, which are electrically grounded.
  • the high-voltage electrode 4 is arranged on the side away from the conveying section 13 and the charging section 120.
  • the positional relationship between the ground electrode 3 and the high-voltage electrode 4 may be reversed. However, it is better to arrange the ground electrode 3 on the conveying section 13, which is the side where the objects to be sorted 100 are input, in terms of handling the electrostatic sorting device 10.
  • the collection container 14 has a partition section 15, and sorts and collects the sorting objects 100 that are displaced and dropped within the electrostatic field space A.
  • both ends 6 of the high-voltage electrode 4 to which a high voltage is applied have an electric field mitigation section 1 made of metal (e.g., aluminum) with a rounded shape that is slightly larger than the size of the end 6 in order to mitigate the electric field.
  • the electric field mitigation section 1 has a recess 2 formed therein, into which the end 6 is inserted to be integrated. Furthermore, the electric field mitigation section 1 has two through holes 7 in a portion where the recess 2 is not formed.
  • the through holes 7 are formed, for example, as screw holes, and two fastening sections 8, for example, bolts are inserted into each of them, and the fastening sections 8 are fastened to the through holes 7, thereby integrating the high-voltage electrode 4 and the electric field mitigation section 1 with the insulator 5. After fastening, the fastening sections 8 are configured to be embedded in the electric field mitigation section 1.
  • the object to be sorted 100 is a mixture of two types of material, for example, fragments of positively charged resin 101 and negatively charged resin 102, and the positively charged resin 101 and the negatively charged resin 102 are frictionally charged by stirring in the charging section 120, so that the positively charged resin 101 is positively charged and the negatively charged resin 102 is negatively charged.
  • a positive high voltage is output from the high voltage power supply section 11.
  • the sorting objects 100 separated in this manner are collected by material in a collection container 14 below the opposing electrode 17.
  • a corona discharge occurs at the end of the high-voltage electrode due to the electric field concentration caused by the edge shape, and ions generated by the discharge adhere to the sorting objects (resin), changing the charged state of the sorting objects.
  • the end 6 of the high-voltage electrode 4 of the electrostatic sorting device 10 is covered with an electric field mitigation portion 1 that is slightly larger and rounder than the end 6 of the high-voltage electrode 4, so electric field concentration does not occur at the end 6 of the high-voltage electrode 4 and corona discharge does not occur (back ionization discharge is less likely to occur). Since the discharge is intermittent and unstable, rather than a sustained discharge like corona discharge caused by the edge shape of the end 6, it does not have a significant adverse effect on sorting.
  • An electrostatic sorting device that forms an electrostatic field space between a ground electrode and a high-voltage electrode arranged opposite to each other, and sorts a plurality of sorting objects displaced by electrostatic force by passing them through the electrostatic field space,
  • the high-voltage electrode is provided at both ends with electric field mitigation parts each having a curved shape and larger than the both ends of the high-voltage electrode. Since the occurrence of corona discharge due to electric field concentration at the end of the high-voltage electrode can be suppressed, stable sorting performance is obtained and sorting efficiency is improved.
  • the electric field mitigation portion has a through hole, The electric field mitigation portion and the insulator are fastened to each other through the through hole. Since the occurrence of discharge originating from the fastening portion can be suppressed, more stable sorting performance can be obtained and sorting efficiency can be improved.
  • Embodiment 2 The electrostatic separation device 10 according to the second embodiment has a similar configuration to that of the first embodiment, but differs from the first embodiment in that the electric field mitigation section 1 is made of an insulating material.
  • the electric field mitigation section 1 is made of an insulating material (for example, glass epoxy, PTFE (abbreviation of polytetrafluoroethylene), ceramic, etc.).
  • both ends 6 of the high voltage electrode 4 are covered with the electric field mitigation parts 1 made of an insulating material that are slightly larger and rounded than the size of both ends 6, so that electric field concentration at both ends 6 is unlikely to occur and corona discharge is unlikely to occur.
  • the electric field mitigation section 1 is made of an insulating material, the entire electric field mitigation section 1 does not become at a high voltage as in the case where the electric field mitigation section 1 is made of metal, and further, because the electric field mitigation section 1 is rounded, the electric field mitigation effect on the surface of the electric field mitigation section 1 is more effective than in the above-mentioned embodiment 1. Therefore, even if electrostatic sorting is performed for a long period of time and the objects 100 (resin) to be sorted are accumulated in the electric field mitigation section 1, the electric field applied within the accumulated layer of the objects 100 (resin) to be sorted is reduced, and reverse ionization discharge is less likely to occur within the layer of the objects 100 (resin) to be sorted.
  • the same effects as those of the first embodiment can be obtained, and Since the electric field mitigation portion is made of an insulating material, In addition to suppressing corona discharge, it is possible to suppress the occurrence of back ionization discharge caused by the material to be sorted (resin) adhering to the electric field mitigation portion, thereby achieving even more stable and high sorting performance.
  • 1 electric field relaxation section 10 electrostatic sorting device, 100 sorting object, 101 positively charged resin, 102 negatively charged resin, 11 high voltage power supply section, 12 charging section, 13 transport section, 14 collection container, 15 partition section, 17 opposing electrode, 2 recessed section, 3 ground electrode, 4 high voltage electrode, 5 insulator, 6 end section, 7 through hole, 8 fastening section, A electrostatic field space.

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  • Electrostatic Separation (AREA)

Abstract

An electrostatic sorting device (10) performs sorting by forming an electrostatic field space (A) between a ground electrode (3) and a high voltage electrode (4), which are arranged so as to oppose each other, and passing a plurality of objects (100) to be sorted, which are displaced by an electrostatic force, through the electrostatic field space (A). Each of both end portions (6) of the high voltage electrode (4) is provided with an electric field relaxation portion (1) which is larger than the size of the each of both end portions (6) of the high voltage electrode (4) and which has a curved surface shape.

Description

静電選別装置Electrostatic Separation Equipment
　本願は、静電選別装置に関するものである。 This application relates to an electrostatic separation device.
　従来の静電選別装置は、複数種の材料の破片からなる混合物を撹拌などして、材料同士を摩擦させ、材料種、混合物中の組成に応じた帯電符号、帯電量で帯電させる。例えば、樹脂のリサイクル工程ではこの特性を利用して、帯電させた混合樹脂片を高電圧の電極で挟まれた静電界空間中に落下させ、静電気力により変位させることで材料毎に選別する静電選別が行われている。例えば、接地電極と高電圧電極との間に静電界空間を形成し、混合樹脂片を静電気的に選別する方法が提案されている（例えば、特許文献１参照）。 　Conventional electrostatic sorting devices stir a mixture of fragments of multiple types of materials, causing friction between the materials and charging them with a charge sign and amount that corresponds to the type of material and composition of the mixture. For example, in the resin recycling process, this characteristic is used to electrostatically sort charged mixed resin fragments by dropping them into an electrostatic field space sandwiched between high-voltage electrodes and displacing them using electrostatic force to separate them into individual materials. For example, a method has been proposed in which an electrostatic field space is formed between a ground electrode and a high-voltage electrode, and mixed resin fragments are electrostatically sorted (see, for example, Patent Document 1).
特許第５５３４８００号Patent No. 5534800
　従来の静電選別装置は、高電圧電極の端部において電界集中によるコロナ放電が発生し、放電によって生成されたイオンが樹脂に付着することで帯電状態が変化し、樹脂の選別効率が低下するという問題点があった。 　Conventional electrostatic sorting devices have the problem that corona discharge occurs due to electric field concentration at the end of the high-voltage electrode, and ions generated by the discharge adhere to the resin, changing the charged state and reducing the sorting efficiency of the resin.
　本願は、上記のような課題を解決するための技術を開示するものであり、高電圧電極の両端部でのコロナ放電を生じ難くして、選別性能が安定するとともに選別効率が向上する静電選別装置を提供することを目的とする。 This application discloses technology to solve the problems described above, and aims to provide an electrostatic sorting device that reduces the occurrence of corona discharge at both ends of the high-voltage electrodes, stabilizes sorting performance, and improves sorting efficiency.
　本願に開示される静電選別装置は、
対向して配置された接地電極と高電圧電極との間に静電界空間を形成し、静電気力により変位された複数の選別対象物を、前記静電界空間に通過させて選別を行う静電選別装置であって、
前記高電圧電極の両端部には、前記高電圧電極の前記両端部の大きさよりも大きくかつ曲面形状を有する電界緩和部をそれぞれ備えたものである。 The electrostatic separation device disclosed in the present application comprises:
An electrostatic sorting device that forms an electrostatic field space between a ground electrode and a high-voltage electrode arranged opposite to each other, and sorts a plurality of sorting objects displaced by electrostatic force by passing the objects through the electrostatic field space,
The high-voltage electrode is provided at both ends with electric field mitigation portions each having a curved shape and larger than the both ends of the high-voltage electrode.
　本願に開示される静電選別装置によれば、
高電圧電極の両端部でのコロナ放電を生じ難く、選別性能が安定するとともに選別効率が向上する。 According to the electrostatic separation device disclosed in the present application,
Corona discharge is less likely to occur at both ends of the high voltage electrode, which stabilizes sorting performance and improves sorting efficiency.
実施の形態１による静電選別装置の構成を示す模式図である。1 is a schematic diagram showing a configuration of an electrostatic separation device according to a first embodiment. FIG. 図１に示した静電選別装置の対向電極部分を拡大した模式図である。FIG. 2 is an enlarged schematic view of a counter electrode portion of the electrostatic separation device shown in FIG. 1 . 図２に示した静電選別装置の対向電極部分を拡大した模式図である。FIG. 3 is an enlarged schematic view of a counter electrode portion of the electrostatic separation device shown in FIG. 2 .
実施の形態１．
　図１は、実施の形態１による静電選別装置の構成を示す模式図である。図２は、図１に示した静電選別装置の対向電極部分を拡大した模式図である。図３は、図２に示した静電選別装置の高電圧電極側を拡大した模式図である。 Embodiment 1.
Fig. 1 is a schematic diagram showing the configuration of an electrostatic separation device according to embodiment 1. Fig. 2 is a schematic diagram showing an enlarged view of a counter electrode portion of the electrostatic separation device shown in Fig. 1. Fig. 3 is a schematic diagram showing an enlarged view of the high-voltage electrode side of the electrostatic separation device shown in Fig. 2.
　図１に示すように、静電選別装置１０は、複数種の材料が混じったフレーク状の選別対象物１００を静電選別するものである。選別対象物１００は、例えば、２種類の材料破片の混合物であり、正帯電樹脂１０１と負帯電樹脂１０２との混合物である。 As shown in FIG. 1, the electrostatic sorting device 10 electrostatically sorts flake-shaped sorting objects 100 that are a mixture of multiple types of materials. The sorting objects 100 are, for example, a mixture of two types of material fragments, a mixture of positively charged resin 101 and negatively charged resin 102.
　静電選別装置１０は、帯電部１２、搬送部１３、対向電極１７、および、回収容器１４を備える。帯電部１２は、選別対象物１００を攪拌し、選別対象物１００同士で摩擦帯電させ、正帯電樹脂１０１を正、負帯電樹脂１０２を負に帯電させる。搬送部１３は、帯電部１２にて帯電された選別対象物１００を静電界空間Ａへ搬送するものであり、例えば振動フィーダにて形成され、電気的に接地されている。 The electrostatic sorting device 10 includes a charging unit 12, a transport unit 13, an opposing electrode 17, and a collection container 14. The charging unit 12 agitates the objects 100 to be sorted, causing frictional charging between the objects 100, and charging the positively charged resin 101 positively and the negatively charged resin 102 negatively. The transport unit 13 transports the objects 100 to be sorted, which have been charged by the charging unit 12, to the electrostatic field space A, and is formed, for example, by a vibrating feeder, and is electrically grounded.
　対向電極１７は、接地電極３と高電圧電極４とが対向して構成される。そして、接地電極３と高電圧電極４との間隔は、搬送部１３側から回収容器１４側に向かうほど漸次広くなるように配置されている。接地電極３は、電気的に接地されている。高電圧電極４には、高電圧電源部１１から例えば、正の高電圧が印加される。例えば、高電圧電源部１１（図２参照）は、高電圧電極４の接地電極３とは相反する側に、高電圧のケーブルをネジ止めで接続し給電している。接地電極３は、電気的に接地された搬送部１３および帯電部１２と近接する側に配置される。また、高電圧電極４は、搬送部１３および帯電部１２０と離反する側に配置される。なお、接地電極３と高電圧電極４との位置関係は、逆の位置関係であってもよい。但し、選別対象物１００が投入される側である搬送部１３に接地電極３が配置されている方が、静電選別装置１０の取り扱い上、優れている。 The opposing electrode 17 is configured with a ground electrode 3 and a high-voltage electrode 4 facing each other. The distance between the ground electrode 3 and the high-voltage electrode 4 is arranged so that it gradually becomes wider from the conveying section 13 side to the collection container 14 side. The ground electrode 3 is electrically grounded. A positive high voltage, for example, is applied to the high-voltage electrode 4 from the high-voltage power supply unit 11. For example, the high-voltage power supply unit 11 (see FIG. 2) connects a high-voltage cable to the side of the high-voltage electrode 4 opposite the ground electrode 3 with a screw to supply power. The ground electrode 3 is arranged on the side close to the conveying section 13 and the charging section 12, which are electrically grounded. The high-voltage electrode 4 is arranged on the side away from the conveying section 13 and the charging section 120. The positional relationship between the ground electrode 3 and the high-voltage electrode 4 may be reversed. However, it is better to arrange the ground electrode 3 on the conveying section 13, which is the side where the objects to be sorted 100 are input, in terms of handling the electrostatic sorting device 10.
　そして、接地電極３と高電圧電極４との間に静電界空間Ａが形成される。回収容器１４は、仕切り部１５を有し、静電界空間Ａ内で変位させながら落下させた選別対象物１００を選別して回収する。 Then, an electrostatic field space A is formed between the ground electrode 3 and the high voltage electrode 4. The collection container 14 has a partition section 15, and sorts and collects the sorting objects 100 that are displaced and dropped within the electrostatic field space A.
　図２および図３に示すように、高電圧が印加される高電圧電極４の両端部６は電界を緩和するため、端部６の大きさよりも一回り大きく丸みを帯びた形状で金属（例えば、アルミニウム）で形成された電界緩和部１を備える。電界緩和部１は、窪み部２が形成されており、当該窪み部２に端部６を差し込んで一体化されている。さらに、電界緩和部１は、窪み部２が形成されていない部分に、２つの貫通孔７を備える。貫通孔７を例えばねじ穴にて形成し、２つの締結部８として例えばボルトをそれぞれ挿入し、締結部８を貫通孔７に締結させることにより、高電圧電極４および電界緩和部１と碍子５とを一体化している。締結後、締結部８は電界緩和部１内に埋没するように構成されている。 As shown in Figures 2 and 3, both ends 6 of the high-voltage electrode 4 to which a high voltage is applied have an electric field mitigation section 1 made of metal (e.g., aluminum) with a rounded shape that is slightly larger than the size of the end 6 in order to mitigate the electric field. The electric field mitigation section 1 has a recess 2 formed therein, into which the end 6 is inserted to be integrated. Furthermore, the electric field mitigation section 1 has two through holes 7 in a portion where the recess 2 is not formed. The through holes 7 are formed, for example, as screw holes, and two fastening sections 8, for example, bolts are inserted into each of them, and the fastening sections 8 are fastened to the through holes 7, thereby integrating the high-voltage electrode 4 and the electric field mitigation section 1 with the insulator 5. After fastening, the fastening sections 8 are configured to be embedded in the electric field mitigation section 1.
　高電圧電極４を支持するためには、上記に示したように、電界緩和部１と碍子５とを締結する必要がある。その際、高電圧電極４と締結部８とが直接触れない、または、近接しないように構成する必要がある。締結部８は、電気的に接地された場合であっても、放電が生じやすくなるので、上記に示したような構成とすることにより、締結部８が電気的に浮遊した状態を確保できる。このことで、締結部８に高電圧および高電界がかからず、締結部８を起点とした放電が生じにくくなる。 In order to support the high-voltage electrode 4, it is necessary to fasten the electric field mitigation portion 1 and the insulator 5 as described above. In this case, it is necessary to configure the high-voltage electrode 4 and the fastening portion 8 so that they do not come into direct contact or are not in close proximity. Even if the fastening portion 8 is electrically grounded, discharge is likely to occur, so by configuring it as described above, it is possible to ensure that the fastening portion 8 is in an electrically floating state. This prevents high voltage and high electric field from being applied to the fastening portion 8, making it difficult for discharge to occur starting from the fastening portion 8.
　次に、上記のように構成された実施の形態１による静電選別装置１０の動作について説明する。この例では、選別対象物１００が２種類の材料、例えば、正帯電樹脂１０１と負帯電樹脂１０２との破片の混合物であり、帯電部１２０内での撹拌により正帯電樹脂１０１および負帯電樹脂１０２同士を摩擦帯電させ、一方の正帯電樹脂１０１は正に、負帯電樹脂１０２は負に帯電している場合を例に説明する。さらに、本実施の形態１では。高電圧電源部１１から正の高電圧を出力する例を示す。 Next, the operation of the electrostatic sorting device 10 according to the first embodiment configured as described above will be described. In this example, the object to be sorted 100 is a mixture of two types of material, for example, fragments of positively charged resin 101 and negatively charged resin 102, and the positively charged resin 101 and the negatively charged resin 102 are frictionally charged by stirring in the charging section 120, so that the positively charged resin 101 is positively charged and the negatively charged resin 102 is negatively charged. Furthermore, in this first embodiment, an example is shown in which a positive high voltage is output from the high voltage power supply section 11.
　まず、高電圧電源部１１から高電圧電極４に正の高電圧を印加すると、高電圧電極４と接地電極３との間に静電界空間Ａが形成される。そして、摩擦帯電させた選別対象物１００を、振動フィーダによる搬送部１３０から搬送され、高電圧電極４と接地電極３との間に形成された静電界空間Ａの上方から落下させて投入する。このとき、各選別対象物１００は対向電極１７間を落下する過程で静電気力により正に帯電している正帯電樹脂１０１は接地電極３側に、負に帯電している負帯電樹脂１０２は高電圧電極４側に引き寄せられ、分離される。 First, when a positive high voltage is applied from the high voltage power supply unit 11 to the high voltage electrode 4, an electrostatic field space A is formed between the high voltage electrode 4 and the ground electrode 3. Then, the frictionally charged sorting objects 100 are transported from the transport unit 130 by a vibrating feeder and dropped from above into the electrostatic field space A formed between the high voltage electrode 4 and the ground electrode 3. At this time, as each sorting object 100 falls between the opposing electrodes 17, the positively charged resin 101, which is positively charged by electrostatic force, is attracted to the ground electrode 3 side, and the negatively charged resin 102, which is negatively charged, is attracted to the high voltage electrode 4 side, and they are separated.
　このようにして分離された選別対象物１００を対向電極１７の下方の回収容器１４にて材料毎に回収する。電界緩和部を備えていない従来の静電選別装置であれば高電圧電極に高電圧を印加した際、高電圧電極の端部においてエッジ形状による電界集中によりコロナ放電が発生し、放電で発生したイオンが選別対象物（樹脂）に付着することで、選別対象物の帯電状態が変化する。 The sorting objects 100 separated in this manner are collected by material in a collection container 14 below the opposing electrode 17. In a conventional electrostatic sorting device that does not have an electric field mitigation section, when a high voltage is applied to the high-voltage electrode, a corona discharge occurs at the end of the high-voltage electrode due to the electric field concentration caused by the edge shape, and ions generated by the discharge adhere to the sorting objects (resin), changing the charged state of the sorting objects.
　これに対し、本実施の形態１では、静電選別装置１０の高電圧電極４の端部６には、高電圧電極４の端部６よりも一回り大きく丸みを帯びた電界緩和部１で覆われているため、高電圧電極４の端部６による電界集中が起こらずコロナ放電は生じない（逆電離放電が生じにくくなる）。端部６のエッジ形状によるコロナ放電のような持続的な放電ではなく、断続的で不安定な放電であるため、選別への悪影響は大きくない。 In contrast, in the present embodiment 1, the end 6 of the high-voltage electrode 4 of the electrostatic sorting device 10 is covered with an electric field mitigation portion 1 that is slightly larger and rounder than the end 6 of the high-voltage electrode 4, so electric field concentration does not occur at the end 6 of the high-voltage electrode 4 and corona discharge does not occur (back ionization discharge is less likely to occur). Since the discharge is intermittent and unstable, rather than a sustained discharge like corona discharge caused by the edge shape of the end 6, it does not have a significant adverse effect on sorting.
　上記のように構成された実施の形態１の静電選別装置によれば、
対向して配置された接地電極と高電圧電極との間に静電界空間を形成し、静電気力により変位された複数の選別対象物を、前記静電界空間に通過させて選別を行う静電選別装置であって、
前記高電圧電極の両端部には、前記高電圧電極の前記両端部の大きさより大きくかつ曲面形状を有する電界緩和部をそれぞれ備えたので、
高電圧電極の端部の電界集中によるコロナ放電の発生を抑制できるため、安定した選別性能を得るとともに選別効率が向上する。 According to the electrostatic separation device of the first embodiment configured as described above,
An electrostatic sorting device that forms an electrostatic field space between a ground electrode and a high-voltage electrode arranged opposite to each other, and sorts a plurality of sorting objects displaced by electrostatic force by passing them through the electrostatic field space,
The high-voltage electrode is provided at both ends with electric field mitigation parts each having a curved shape and larger than the both ends of the high-voltage electrode.
Since the occurrence of corona discharge due to electric field concentration at the end of the high-voltage electrode can be suppressed, stable sorting performance is obtained and sorting efficiency is improved.
　さらに、前記電界緩和部は、貫通孔を有し、
前記電界緩和部と碍子とを当該貫通孔を介して締結する締結部を備えたので、
締結部を起点とする放電の発生を抑制できるため、さらに、安定した選別性能を得るとともに選別効率が向上する。 Furthermore, the electric field mitigation portion has a through hole,
The electric field mitigation portion and the insulator are fastened to each other through the through hole.
Since the occurrence of discharge originating from the fastening portion can be suppressed, more stable sorting performance can be obtained and sorting efficiency can be improved.
実施の形態２．
　実施の形態２による静電選別装置１０は、上記実施の形態１と同様の構成を備えるが、上記実施の形態１と異なる点は、電界緩和部１が絶縁材にて構成されている点である。本実施の形態２による静電選別装置１０は、電界緩和部１が絶縁材（例えば、ガラスエポキシ、ＰＴＦＥ（ｐｏｌｙｔｅｔｒａｆｌｕｏｒｏｅｔｈｙｌｅｎｅの略称）、セラミックなど）で形成される。 Embodiment 2.
The electrostatic separation device 10 according to the second embodiment has a similar configuration to that of the first embodiment, but differs from the first embodiment in that the electric field mitigation section 1 is made of an insulating material. In the electrostatic separation device 10 according to the second embodiment, the electric field mitigation section 1 is made of an insulating material (for example, glass epoxy, PTFE (abbreviation of polytetrafluoroethylene), ceramic, etc.).
　次に、上記のように構成された実施の形態２における静電選別装置１０の動作について説明する。まず、高電圧電極４に高電圧が印加された際、高電圧電極４の両端部６に両端部６の大きさよりも一回り大きく丸みを帯びた絶縁材による電界緩和部１で覆われているため、両端部６での電界集中が生じにくくコロナ放電が生じにくい。 Next, the operation of the electrostatic sorting device 10 in the second embodiment configured as described above will be described. First, when a high voltage is applied to the high voltage electrode 4, both ends 6 of the high voltage electrode 4 are covered with the electric field mitigation parts 1 made of an insulating material that are slightly larger and rounded than the size of both ends 6, so that electric field concentration at both ends 6 is unlikely to occur and corona discharge is unlikely to occur.
　さらに、電界緩和部１が絶縁材にて形成されているため、電界緩和部１が金属の場合のように電界緩和部１全体が高電圧にはならず、さらに、電界緩和部１が丸みを帯びていることで電界緩和部１の表面における電界緩和効果が上記実施の形態１の場合よりさらに働く。よって、長期間静電選別を行い電界緩和部１に選別対象物１００（樹脂）が堆積した場合でも、堆積した選別対象物１００（樹脂）層内にかかる電界は小さくなり、選別対象物１００（樹脂）層内での逆電離放電が生じにくくなる。
 Furthermore, because the electric field mitigation section 1 is made of an insulating material, the entire electric field mitigation section 1 does not become at a high voltage as in the case where the electric field mitigation section 1 is made of metal, and further, because the electric field mitigation section 1 is rounded, the electric field mitigation effect on the surface of the electric field mitigation section 1 is more effective than in the above-mentioned embodiment 1. Therefore, even if electrostatic sorting is performed for a long period of time and the objects 100 (resin) to be sorted are accumulated in the electric field mitigation section 1, the electric field applied within the accumulated layer of the objects 100 (resin) to be sorted is reduced, and reverse ionization discharge is less likely to occur within the layer of the objects 100 (resin) to be sorted.
　上記のように構成された実施の形態２の静電選別装置によれば、上記実施の形態１と同様の効果を奏するとともに、
前記電界緩和部は、絶縁材にて構成されたので、
コロナ放電の抑制に加えて、電界緩和部に付着した選別対象物（樹脂）による逆電離放電の発生を抑制できるため、さらに安定して高い選別性能を得ることができる。 According to the electrostatic separation device of the second embodiment configured as described above, the same effects as those of the first embodiment can be obtained, and
Since the electric field mitigation portion is made of an insulating material,
In addition to suppressing corona discharge, it is possible to suppress the occurrence of back ionization discharge caused by the material to be sorted (resin) adhering to the electric field mitigation portion, thereby achieving even more stable and high sorting performance.
　本願は、様々な例示的な実施の形態及び実施例が記載されているが、１つ、または複数の実施の形態に記載された様々な特徴、態様、及び機能は特定の実施の形態の適用に限られるのではなく、単独で、または様々な組み合わせで実施の形態に適用可能である。
従って、例示されていない無数の変形例が、本願に開示される技術の範囲内において想定される。例えば、少なくとも１つの構成要素を変形する場合、追加する場合または省略する場合、さらには、少なくとも１つの構成要素を抽出し、他の実施の形態の構成要素と組み合わせる場合が含まれるものとする。 Although the present application describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments are not limited to application to a particular embodiment, but may be applied to the embodiments alone or in various combinations.
Therefore, countless modifications not exemplified are assumed within the scope of the technology disclosed in this application, including, for example, modifying, adding, or omitting at least one component, and further, extracting at least one component and combining it with a component of another embodiment.
　１　電界緩和部、１０　静電選別装置、１００　選別対象物、１０１　正帯電樹脂、１０２　負帯電樹脂、１１　高電圧電源部、１２　帯電部、１３　搬送部、１４　回収容器、１５　仕切り部、１７　対向電極、２　窪み部、３　接地電極、４　高電圧電極、５　碍子、６　端部、７　貫通孔、８　締結部、Ａ　静電界空間。 1 electric field relaxation section, 10 electrostatic sorting device, 100 sorting object, 101 positively charged resin, 102 negatively charged resin, 11 high voltage power supply section, 12 charging section, 13 transport section, 14 collection container, 15 partition section, 17 opposing electrode, 2 recessed section, 3 ground electrode, 4 high voltage electrode, 5 insulator, 6 end section, 7 through hole, 8 fastening section, A electrostatic field space.

Claims (3)

  1. 対向して配置された接地電極と高電圧電極との間に静電界空間を形成し、静電気力により変位された複数の選別対象物を、前記静電界空間に通過させて選別を行う静電選別装置であって、
    前記高電圧電極の両端部には、前記高電圧電極の前記両端部の大きさよりも大きくかつ曲面形状を有する電界緩和部をそれぞれ備えた静電選別装置。     An electrostatic sorting device that forms an electrostatic field space between a ground electrode and a high-voltage electrode arranged opposite to each other, and sorts a plurality of sorting objects displaced by electrostatic force by passing the objects through the electrostatic field space,
    The electrostatic separation device includes electric field mitigation sections, each of which is larger than both ends of the high voltage electrode and has a curved shape, at both ends of the high voltage electrode.
  2. 前記電界緩和部は、絶縁材にて構成された請求項１に記載の静電選別装置。 The electrostatic separation device according to claim 1, wherein the electric field mitigation section is made of an insulating material.
  3. 前記電界緩和部は、貫通孔を有し、
    前記電界緩和部と碍子とを当該貫通孔を介して締結する締結部を備えた請求項１または請求項２に記載の静電選別装置。     The electric field mitigation portion has a through hole,
    3. The electrostatic separation device according to claim 1, further comprising a fastening portion that fastens the electric field mitigation portion and the insulator through the through hole.
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Citations (3)

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Publication number Priority date Publication date Assignee Title
JPH10235228A (en) * 1997-02-27 1998-09-08 Mitsubishi Heavy Ind Ltd Electrostatic sorting device
JP2001079450A (en) * 1999-09-20 2001-03-27 Hitachi Zosen Corp Apparatus for sorting plastics.
JP2003001142A (en) * 2001-06-19 2003-01-07 Mitsubishi Electric Corp Electro static sorting device

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JP2003049628A (en) * 2001-08-08 2003-02-21 Yamakei:Kk Purifying device of exhaust gas material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10235228A (en) * 1997-02-27 1998-09-08 Mitsubishi Heavy Ind Ltd Electrostatic sorting device
JP2001079450A (en) * 1999-09-20 2001-03-27 Hitachi Zosen Corp Apparatus for sorting plastics.
JP2003001142A (en) * 2001-06-19 2003-01-07 Mitsubishi Electric Corp Electro static sorting device

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