JP3930005B2 - Molding material vacuum dryer - Google Patents

Molding material vacuum dryer Download PDF

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JP3930005B2
JP3930005B2 JP2004250553A JP2004250553A JP3930005B2 JP 3930005 B2 JP3930005 B2 JP 3930005B2 JP 2004250553 A JP2004250553 A JP 2004250553A JP 2004250553 A JP2004250553 A JP 2004250553A JP 3930005 B2 JP3930005 B2 JP 3930005B2
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drying
molding material
storage tank
hopper
desiccant
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JP2006062308A (en
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昭 藤山
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昭 藤山
木川 一彦
李 相烈
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Priority to KR1020040078623A priority patent/KR100572374B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/18—Drying solid materials or objects by processes involving the application of heat by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Microbiology (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Drying Of Solid Materials (AREA)

Description

本発明は、射出成形機による樹脂成形の材料のような成形材料、例えば樹脂ペレットを乾燥するのに好適な成形材料真空乾燥装置に関する。   The present invention relates to a molding material vacuum drying apparatus suitable for drying a molding material such as a resin molding material by an injection molding machine, for example, resin pellets.

樹脂成形材料である樹脂ペレットの外周に水分が付着していたり、樹脂ペレット内に水分が含まれていると、成形時の加熱でそれらの水分が気化し、成型品の品質に悪影響を与えたり、不良品を発生させる虞があるので、射出成形機へ供給する成形材料に対して、供給前に乾燥処理が行われている。
この乾燥処理は一般的に熱風乾燥により行われているが、熱風乾燥を行うには大型の熱風乾燥装置を必要とし、通常その設定温度は１２０℃程度とされている。
しかし、加熱温度が水分の蒸発温度である１００℃を越えると、成形材料の黄変や酸化が発生しやすい。また、熱風乾燥装置は使用電力量が多くて、射出成形製品の製造コストを引き上げる要因となり、吹き出す熱風によって室内の温度が上昇し、作業環境が悪化する虞がある。さらに、大型の熱風乾燥装置は、その据え付け場所を確保することも問題となる。 If moisture is attached to the outer periphery of resin pellets, which are resin molding materials, or if moisture is contained in the resin pellets, the moisture will evaporate due to heating during molding, which may adversely affect the quality of the molded product. Since there is a risk of generating defective products, a drying process is performed on the molding material supplied to the injection molding machine before supply.
This drying process is generally performed by hot air drying. However, a large hot air drying device is required to perform hot air drying, and the set temperature is usually about 120 ° C.
However, when the heating temperature exceeds 100 ° C., which is the evaporation temperature of moisture, the molding material tends to yellow or oxidize. In addition, the hot air drying apparatus uses a large amount of electric power and increases the manufacturing cost of the injection molded product. The hot air blown out increases the temperature in the room and may deteriorate the working environment. Furthermore, securing a place for installing the large-sized hot air drying apparatus is also a problem.

このため、水分蒸発温度を下げて、成形材料の黄変・酸化等を防ぐために、減圧手段として真空ポンプを使用し、減圧雰囲気で成形材料の乾燥を行い、また、成形材料を加熱乾燥する乾燥手段としてヒータを使用するようになっている。
ところが、従来の真空乾燥はバッチ方式で行われており、空気の対流による伝熱がないので、加熱効率が悪いという欠点がある。
また、乾燥した成形材料を射出成形機へ供給する際に、再度吸湿しないように、乾燥空気や、窒素ガス、アルゴンガス等の低露点の雰囲気で覆われた供給ホッパが必要となる。 Therefore, in order to lower the moisture evaporation temperature and prevent yellowing and oxidation of the molding material, use a vacuum pump as a decompression means, dry the molding material in a reduced pressure atmosphere, and dry the molding material by heating. A heater is used as a means.
However, the conventional vacuum drying is performed in a batch system, and there is no heat transfer due to air convection.
Further, when supplying the dried molding material to the injection molding machine, a supply hopper covered with a low dew point atmosphere such as dry air, nitrogen gas or argon gas is required so as not to absorb moisture again.

本発明が解決しようとする課題は、比較的低温で速やかに成形材料を乾燥することができ、成形材料の黄変・酸化等の変質を防ぐ成形材料真空乾燥装置を提供することにある。   The problem to be solved by the present invention is to provide a molding material vacuum drying apparatus which can quickly dry a molding material at a relatively low temperature and prevents deterioration of the molding material such as yellowing and oxidation.

本発明の成形材料真空乾燥装置は、成形材料を収納して加熱乾燥する乾燥ホッパと、乾燥剤を貯蔵して加熱する乾燥剤貯蔵槽とを設け、前記乾燥ホッパと第１の真空ポンプとを排気路を介して連絡し、前記乾燥剤貯蔵槽に流路開閉弁を設けた外気導入路を連結し、前記乾燥ホッパの下部と前記乾燥剤貯蔵槽とを別の排気路で連絡したものであって、前記乾燥ホッパと前記乾燥剤貯蔵槽とを隣接して設けると共に、これら乾燥ホッパと乾燥剤貯蔵槽との境界部にヒータを設置し、該ヒータによって前記乾燥ホッパ内の成形材料及び前記乾燥剤貯蔵槽内の乾燥剤を共に加熱することを特徴とするものである。
請求項２に係る成形材料真空乾燥装置は、請求項１に係る成形材料真空乾燥装置において、前記別の排気路に流路開閉弁を設け、前記別の排気路における乾燥剤貯蔵槽と前記流路開閉弁との間を、乾燥剤乾燥用流路によって第２の真空ポンプに連絡したことを特徴とするものである。
請求項３に係る成形材料真空乾燥装置は、請求項１乃至２のいずれか１つに係る成形材料真空乾燥装置において、前記乾燥ホッパと成形材料貯蔵タンクとが輸送パイプで連絡され、前記排気路が、流路開閉弁を設けた第１流路と、圧力調整弁を設けた第２流路とを並列に有することを特徴とするものである。 The molding material vacuum drying apparatus of the present invention is provided with a drying hopper for storing and heating and drying the molding material, and a desiccant storage tank for storing and heating the desiccant, and the drying hopper and the first vacuum pump are provided. which communicates through an exhaust passage, and connecting the desiccant air introduction passage provided with a flow path opening and closing valve to the storage tank and communicating the lower and the desiccant reservoir of the drying hopper in another exhaust path The drying hopper and the desiccant storage tank are provided adjacent to each other, and a heater is installed at the boundary between the drying hopper and the desiccant storage tank, and the molding material in the drying hopper and the heater are installed by the heater. The desiccant in the desiccant storage tank is heated together .
A molding material vacuum drying apparatus according to a second aspect is the molding material vacuum drying apparatus according to the first aspect, wherein a flow opening / closing valve is provided in the another exhaust passage, and the desiccant storage tank and the flow in the another exhaust passage are provided. The passage opening / closing valve is connected to the second vacuum pump by a desiccant drying passage.
A molding material vacuum drying apparatus according to claim 3 is the molding material vacuum drying apparatus according to any one of claims 1 to 2, wherein the drying hopper and the molding material storage tank are connected by a transport pipe, and the exhaust path Has a first flow path provided with a flow path opening / closing valve and a second flow path provided with a pressure adjusting valve in parallel.

請求項１に係る発明によれば、成形材料を低真空状態で加熱乾燥するので、比較的低温で水分が蒸発して短時間で乾燥できるばかりか、成形材料乾燥中に乾燥空気を乾燥ホッパ下部から噴出させると、成形材料が攪拌されるので、成形材料の温度が均一となってさらに速やかに乾燥され、この結果、成形材料の黄変・酸化等の変質を防ぎ、電力消費量が少なくて済み、温度上昇による作業環境の悪化も抑制できる。
また、乾燥剤貯蔵槽を通過した乾燥空気を供給して乾燥ホッパ内を大気圧に戻すことができるので、成形材料が再吸湿することが無く、再吸湿を防ぐような特殊構造の供給ホッパが不要となる。熱風発生装置を利用せずに、同じヒータで成形材料及び乾燥剤を直接加熱するので、さらに使用電力を少なくすることができ、装置の構造も簡略化される。 According to the first aspect of the present invention, since the molding material is heated and dried in a low vacuum state, moisture can evaporate at a relatively low temperature and can be dried in a short time. Since the molding material is agitated, the temperature of the molding material becomes uniform, and the molding material is dried more quickly. As a result, the molding material is prevented from being yellowed and oxidized and the power consumption is low. In addition, deterioration of the working environment due to temperature rise can be suppressed.
Also, since the drying air that has passed through the desiccant storage tank can be supplied to return the inside of the drying hopper to atmospheric pressure, there is no supply hopper with a special structure that prevents the molding material from reabsorbing moisture and preventing reabsorption. It becomes unnecessary. Since the molding material and the desiccant are directly heated with the same heater without using the hot air generator, the power consumption can be further reduced, and the structure of the apparatus is simplified.

請求項２に係る発明によれば、乾燥剤貯蔵槽内の乾燥剤は、乾燥ホッパにおいて真空乾燥が行われている間も乾燥再生されるので、常に十分乾燥した空気を供給することが可能となる。 According to the invention of claim 2, desiccant in the desiccant reservoirs, since dried reproduced while the vacuum drying is performed in the drying hopper, it can be supplied always enough dry air It becomes.

請求項３に係る発明によれば、排気路からの排気によって成形材料を真空吸引する際に、圧力調整弁を操作して成形材料の吸引力を調節することができる。 According to the invention of claim 3, when the vacuum suction of the molding material by the exhaust from the exhaust passage, Ru can adjust the attraction force of the molding material by operating a pressure control valve.

以下、本発明の実施例を図面に基づいて詳細に説明する。
本発明の成形材料真空乾燥装置は、図１に示すように、成形材料である樹脂ペレット３０を低真空状態で加熱乾燥させて、射出成形機へ供給するものであって、樹脂ペレット３０を加熱乾燥する乾燥ホッパ１、ヒータ２、樹脂ペレット３０を貯蔵した成形材料貯蔵タンク２５、成形材料貯蔵タンク２５と乾燥ホッパ１とを接続する輸送パイプ９、筒状の乾燥剤貯蔵槽１４、乾燥ホッパ１へ連絡された第１の真空ポンプ３、乾燥剤貯蔵槽１４へ連絡された第２の真空ポンプ１７、及び、供給ホッパ２３を備える。
また、成形材料真空乾燥装置は、図２に示すように、電気制御ボックス４１を介して操作される。電気制御ボックス４１の表面には、メインスイッチ４２及びタッチパネル方式の操作部４５と共に、自動温度調節計４３が取り付けられている。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1, the molding material vacuum drying apparatus of the present invention heats and drys resin pellets 30 as molding materials in a low vacuum state and supplies them to an injection molding machine. Drying hopper 1 to be dried, heater 2, molding material storage tank 25 storing resin pellets 30, transport pipe 9 connecting the molding material storage tank 25 and drying hopper 1, cylindrical desiccant storage tank 14, drying hopper 1 The first vacuum pump 3 communicated with the second vacuum pump 17, the second vacuum pump 17 communicated with the desiccant storage tank 14, and the supply hopper 23.
Further, the molding material vacuum drying apparatus is operated via an electric control box 41 as shown in FIG. An automatic temperature controller 43 is attached to the surface of the electric control box 41 together with the main switch 42 and the touch panel type operation unit 45.

乾燥ホッパ１及び乾燥剤貯蔵槽１４は外気に対して密封されており、乾燥ホッパ１が乾燥剤貯蔵槽１４の中心を貫通すると共に、乾燥ホッパ１と乾燥剤貯蔵槽１４との間を空気が流通するようになっている。
乾燥剤貯蔵槽１４の内部には、合成ゼオライト系吸着剤等の乾燥剤３１が充填されている。そして、乾燥ホッパ１の底面は、乾燥剤貯蔵槽１４の底面の上方に位置して、乾燥剤貯蔵槽１４内の乾燥剤３１により被覆され、断熱性の高い二重構造となっている。
また、乾燥剤貯蔵槽１４の側面には、乾燥ホッパ１の内部を透視できる樹脂量監視窓２８が形成されると共に、ここに樹脂量監視センサ１５が設置される。
樹脂量監視センサ１５は、高さを変えて複数個設置し、電気制御ボック４１の操作部４５によって、いずれかの樹脂量監視センサ１５を選択できるようにすると良い。
さらに、乾燥ホッパ１と乾燥剤貯蔵槽１４の境界面に沿ってヒータ２が装着され、乾燥ホッパ１の内部及び乾燥剤貯蔵槽１４の内部を同時に加熱するようになっている。 The drying hopper 1 and the desiccant storage tank 14 are sealed against the outside air. The drying hopper 1 penetrates the center of the desiccant storage tank 14 and air is passed between the drying hopper 1 and the desiccant storage tank 14. It comes to circulate.
The desiccant storage tank 14 is filled with a desiccant 31 such as a synthetic zeolite adsorbent. The bottom surface of the drying hopper 1 is located above the bottom surface of the desiccant storage tank 14 and is covered with the desiccant 31 in the desiccant storage tank 14 to form a double structure with high heat insulation.
Further, a resin amount monitoring window 28 through which the inside of the drying hopper 1 can be seen is formed on the side surface of the desiccant storage tank 14, and a resin amount monitoring sensor 15 is installed here.
A plurality of resin amount monitoring sensors 15 may be installed at different heights so that any one of the resin amount monitoring sensors 15 can be selected by the operation unit 45 of the electric control box 41.
Further, a heater 2 is mounted along the boundary surface between the drying hopper 1 and the desiccant storage tank 14 to heat the inside of the drying hopper 1 and the inside of the desiccant storage tank 14 at the same time.

乾燥ホッパ１の底部中心から下方に排出管３２が延び、排出管３２の基部に乾燥空気噴出リング２４が周方向に沿って設置される。
また、排出管３２の下端部は供給ホッパ２３の上部に挿入され、排出管３２下端の排出口には空気の流通を遮断する真空遮断弁１３が設置されると共に、そのやや上方には樹脂ペレット３０の排出を遮断するシャッタ１２が設置される。
さらに、供給ホッパ２３の下端は射出成形機に接続され、供給ホッパ２３の下端排出口よりやや上方に樹脂残量監視窓２９が形成されると共に、ここに樹脂残量監視センサ１６が設置されている。 A discharge pipe 32 extends downward from the center of the bottom of the drying hopper 1, and a dry air jet ring 24 is installed along the circumferential direction at the base of the discharge pipe 32.
Further, the lower end portion of the discharge pipe 32 is inserted into the upper portion of the supply hopper 23, and the vacuum shut-off valve 13 for shutting off the air flow is installed at the discharge port at the lower end of the discharge pipe 32. A shutter 12 for blocking 30 discharge is installed.
Further, the lower end of the supply hopper 23 is connected to an injection molding machine, a resin remaining amount monitoring window 29 is formed slightly above the lower end discharge port of the supply hopper 23, and the remaining resin amount monitoring sensor 16 is installed here. Yes.

乾燥ホッパ１の上部には輸送パイプ９の一端が開口し、輸送パイプ９の他端部に設けられた吸引パイプ８が、成形材料貯蔵タンク２５内へ挿入される。また、輸送パイプ９の中間部にはピンチバルブ７が設置されている。
なお、輸送パイプ９の一端には落下ガイド板を設け、計量な樹脂ペレット３０が輸送パイプ９から静かに乾燥ホッパ１内へ落下するようになっている。 One end of the transport pipe 9 is opened above the drying hopper 1, and the suction pipe 8 provided at the other end of the transport pipe 9 is inserted into the molding material storage tank 25. In addition, a pinch valve 7 is installed at an intermediate portion of the transport pipe 9.
Note that a drop guide plate is provided at one end of the transport pipe 9 so that the measured resin pellets 30 gently fall into the dry hopper 1 from the transport pipe 9.

乾燥ホッパ１は排気路３３を介して第１の真空ポンプ３と連絡されている。排気路３３の中間部は、第１流路３４ａと第２流路３４ｂとを並列に有し、並列部分よりも乾燥ホッパ１寄りには圧力計５が設置され、さらにその上流側に防塵フィルタ６が装着されている。
排気路３３の吸気口には、軽量な樹脂ペレット３０が吸い込まれるのを防ぐために、吸い込み防止メタルプレートが設置されている。
また、第１流路３４ａに流路開閉弁４が設けられ、第２流路３４ｂに圧力調整弁１０及び開閉弁１１が設置されている。なお、圧力調整弁１０はニードル式の圧力調整バルブとし、一度調節したら、二回目からはほとんどその調節量のまま使用できるようにする。 The drying hopper 1 is in communication with the first vacuum pump 3 through an exhaust passage 33. The intermediate portion of the exhaust passage 33 has a first flow path 34a and a second flow path 34b in parallel, and a pressure gauge 5 is installed closer to the drying hopper 1 than the parallel portion, and further a dustproof filter on the upstream side thereof. 6 is installed.
A suction-preventing metal plate is installed at the intake port of the exhaust passage 33 in order to prevent the lightweight resin pellet 30 from being sucked.
Further, the flow path opening / closing valve 4 is provided in the first flow path 34a, and the pressure regulating valve 10 and the opening / closing valve 11 are disposed in the second flow path 34b. The pressure regulating valve 10 is a needle type pressure regulating valve, and once adjusted, the pressure regulating valve 10 can be used with almost the adjusted amount from the second time.

乾燥ホッパ１の下部に設けられた乾燥空気噴出リング２４と乾燥剤貯蔵槽１４とは、別の排気路３６によって連絡される。
別の排気路３６の乾燥剤貯蔵槽１４寄りには防塵フィルタ２１が装着され、防塵フィルタ２１より乾燥空気噴出リング２４寄りには、乾燥空気導入バルブ２２より成る流路開閉弁が設けられる。
また、乾燥剤貯蔵槽１４と乾燥空気導入バルブ２２との間において、別の排気路３６は乾燥剤乾燥用流路３５を介して第２の真空ポンプ１７と連絡される。乾燥剤乾燥用流路３５には流路開閉弁１８が設置されている。
さらに、乾燥剤貯蔵槽１４に外気導入路３７が接続され、外気導入路３７に外気導入バルブ１９より成る流路開閉弁及び防塵フィルタ２０が設置される。
また、排気路３３の並列部分よりも下流側と、乾燥剤乾燥用流路３５の流路開閉弁１８よりも下流側とは、共通排気バルブ２６より成る開閉弁を有する共通流路３８によって連結されている。 The dry air jet ring 24 provided in the lower part of the drying hopper 1 and the desiccant storage tank 14 are connected to each other by another exhaust path 36.
A dustproof filter 21 is mounted on the other exhaust path 36 near the desiccant storage tank 14, and a flow path opening / closing valve including a dry air introduction valve 22 is provided closer to the dry air ejection ring 24 than the dustproof filter 21.
Further, another exhaust path 36 is connected to the second vacuum pump 17 via the desiccant drying flow path 35 between the desiccant storage tank 14 and the dry air introduction valve 22. A flow path opening / closing valve 18 is installed in the desiccant drying flow path 35.
In addition, an outside air introduction path 37 is connected to the desiccant storage tank 14, and a channel opening / closing valve and a dustproof filter 20 including the outside air introduction valve 19 are installed in the outside air introduction path 37.
Further, the downstream side of the parallel portion of the exhaust path 33 and the downstream side of the flow path opening / closing valve 18 of the desiccant drying flow path 35 are connected by a common flow path 38 having an open / close valve composed of the common exhaust valve 26. Has been.

なお、乾燥ホッパ１、乾燥剤貯蔵槽１４、供給ホッパ２３及び各排気路を構成する配管の接続部分は、Ｏリング、パッキング等により密封されている。
また、上記したように、各空気流路には防塵フィルタ６，２０，２１が設置されており、目詰まりが発生した場合には、簡単に掃除や交換ができるようになっている。
さらに、ピンチバルブ７、シャッタ１２及び真空遮断弁１３は、それぞれエアシリンダＡＳで開閉駆動される。エアシリンダＡＳには押し・引きいずれの方向においても近接スイッチが設けられて、開放信号及び閉鎖信号を発するようになっている。 In addition, the connection part of the drying hopper 1, the desiccant storage tank 14, the supply hopper 23, and the piping which comprises each exhaust path is sealed by O-ring, packing, etc.
Further, as described above, the dustproof filters 6, 20, and 21 are installed in each air flow path, and can be easily cleaned and replaced when clogging occurs.
Further, the pinch valve 7, the shutter 12, and the vacuum shut-off valve 13 are each opened and closed by an air cylinder AS. The air cylinder AS is provided with a proximity switch in both the pushing and pulling directions to generate an open signal and a close signal.

樹脂ペレット３０の乾燥は次のように行われる。
電気制御ボックス４１のメインスイッチ４２を入れると、自動温度調節計４３のスイッチが入って、ヒータ２が加熱を開始し、乾燥すべき樹脂ペレット３０が乾燥ホッパ１内に充填されるのを待つ。
同時に、ヒータ２は乾燥剤貯蔵槽１４内の乾燥剤３１を加熱する。加熱温度は、自動温度調節計４３で指示される。 Drying of the resin pellet 30 is performed as follows.
When the main switch 42 of the electric control box 41 is turned on, the automatic temperature controller 43 is turned on, the heater 2 starts heating, and waits for the resin pellets 30 to be dried to be filled in the drying hopper 1.
At the same time, the heater 2 heats the desiccant 31 in the desiccant storage tank 14. The heating temperature is instructed by the automatic temperature controller 43.

次いで、乾燥ホッパ１のシャッタ１２を閉じ、輸送パイプ９のピンチバルブ７を開くと、ピンチバルブ７のエアシリンダＡＳからの開放信号を受けて第１の真空ポンプ３が作動する。さらに、第２流路３４ｂの開閉弁１１を開けてから、圧力調製バルブ１０を開いて吸引圧力を調節すると、乾燥ホッパ１内が減圧されて、成形材料貯蔵タンク２５内の樹脂ペレット３０が輸送パイプ９を通して吸引され、輸送パイプ９の一端から乾燥ホッパ１内へ排出される。
なお、吸引パイプ８の上部への空気吸い込み量を調節することによって、樹脂ペレット３０の吸引量を調節することもできる。 Next, when the shutter 12 of the drying hopper 1 is closed and the pinch valve 7 of the transport pipe 9 is opened, the first vacuum pump 3 is activated in response to an open signal from the air cylinder AS of the pinch valve 7. Furthermore, when the opening / closing valve 11 of the second flow path 34b is opened and then the pressure adjusting valve 10 is opened to adjust the suction pressure, the inside of the drying hopper 1 is depressurized, and the resin pellets 30 in the molding material storage tank 25 are transported. It is sucked through the pipe 9 and discharged from one end of the transport pipe 9 into the drying hopper 1.
Note that the amount of suction of the resin pellets 30 can be adjusted by adjusting the amount of air sucked into the upper portion of the suction pipe 8.

また、第１の真空ポンプ３を起動するのと同時に、第２の真空ポンプ１７を起動させて流路開閉弁１８を開き、乾燥剤貯蔵槽１４内を減圧して、その内部に貯蔵されている乾燥剤３１の乾燥排気を行う。
乾燥ホッパ１内の樹脂ペレット３０が所定高さに達したことを樹脂量監視センサ１５が検知すると、樹脂量監視センサ１５の検知信号を受けて輸送パイプ９のピンチバルブ７が閉じ、乾燥ホッパ１への樹脂ペレット３０の供給が停止する。
同時に、第２流路３４ｂの開閉弁１１が閉じ、流路開閉弁４が開いて第１の真空ポンプ３が真空排気を継続することにより、乾燥ホッパ１内の樹脂ペレット３０の真空乾燥が行われる。
低真空雰囲気下では、水の蒸発温度が低いため、ヒータ２で加熱された水分が比較的低温で蒸発し、短時間で排出されるので、樹脂ペレット３０が黄変しにくい。 At the same time as starting the first vacuum pump 3, the second vacuum pump 17 is started to open the flow path opening / closing valve 18, and the inside of the desiccant storage tank 14 is decompressed and stored therein. Drying exhaust of the desiccant 31 is performed.
When the resin amount monitoring sensor 15 detects that the resin pellet 30 in the drying hopper 1 has reached a predetermined height, the pinch valve 7 of the transport pipe 9 is closed in response to the detection signal of the resin amount monitoring sensor 15, and the drying hopper 1 The supply of the resin pellet 30 to is stopped.
At the same time, the opening / closing valve 11 of the second flow path 34b is closed, the flow opening / closing valve 4 is opened, and the first vacuum pump 3 continues to be evacuated, whereby the resin pellets 30 in the drying hopper 1 are vacuum dried. Is called.
In a low vacuum atmosphere, since the water evaporation temperature is low, the water heated by the heater 2 evaporates at a relatively low temperature and is discharged in a short time, so that the resin pellet 30 is hardly yellowed.

また、乾燥ホッパ１内で樹脂ペレット３０の真空乾燥を行っている間に、タイマーで設定した時間ごとに、外気導入バルブ１９及び乾燥空気導入バルブ２２を開く。すると、外気導入路３７から導入されて乾燥剤貯蔵槽１４を通過した乾燥空気が、乾燥ホッパ１の底部中央に設置された乾燥空気噴出リング２４から間欠的に噴出して、乾燥ホッパ１内の樹脂ペレット３０を攪拌する。
この結果、乾燥ホッパ１内の樹脂ペレット３０の温度が均一化されると共に、流速の速い乾燥空気によって水分排出が促進されて、速やかで均一な乾燥が行われる。 In addition, while the resin pellets 30 are vacuum dried in the drying hopper 1, the outside air introduction valve 19 and the dry air introduction valve 22 are opened every time set by a timer. Then, the dry air introduced from the outside air introduction path 37 and passing through the desiccant storage tank 14 is intermittently ejected from the dry air ejection ring 24 installed at the bottom center of the drying hopper 1, and the inside of the drying hopper 1 The resin pellet 30 is stirred.
As a result, the temperature of the resin pellets 30 in the drying hopper 1 is made uniform, and moisture discharge is promoted by dry air having a high flow rate, so that quick and uniform drying is performed.

供給ホッパ２３内の樹脂ペレット３０の残量が少なくなったことを樹脂残量監視センサ１６が検知すると、樹脂残量監視センサ１６が検知信号を発し、この検知信号を受けて流路開閉弁４及び流路開閉弁１８が閉じる。また、乾燥空気導入バルブ２２及び外気導入バルブ１９が開く。
この結果、乾燥ホッパ１からの真空排気が停止すると共に、外気導入路３７から導入されて乾燥剤貯蔵槽１４を通過した乾燥空気が乾燥ホッパ１内に流入し、乾燥ホッパ１内が大気圧に戻り、乾燥ホッパ１内と供給ホッパ２３内との間には圧力差が無くなる。 When the remaining resin monitoring sensor 16 detects that the remaining amount of the resin pellets 30 in the supply hopper 23 has decreased, the remaining resin monitoring sensor 16 issues a detection signal, and the flow path opening / closing valve 4 receives this detection signal. And the flow path opening / closing valve 18 is closed. Further, the dry air introduction valve 22 and the outside air introduction valve 19 are opened.
As a result, the vacuum evacuation from the drying hopper 1 is stopped, and the dry air introduced from the outside air introduction passage 37 and passing through the desiccant storage tank 14 flows into the drying hopper 1, and the inside of the drying hopper 1 is brought to atmospheric pressure. Returning, there is no pressure difference between the drying hopper 1 and the supply hopper 23.

乾燥ホッパ１内が大気圧に戻ったことを圧力計５で確認したら、真空遮断弁１３を開き、さらにシャッタ１２を開く。
すると、乾燥ホッパ１内の乾燥終了した樹脂ペレット３０が、供給ホッパ２３へ全量落下する。
次いで、第２の真空ポンプ１７を作動した状態で、外気導入バルブ１９を閉じてから、流路開閉弁１８を３〜５秒程度開くと、乾燥ホッパ１、乾燥剤貯蔵槽１４及び供給ホッパ２３の内部が減圧され、供給ホッパ２３内は、乾燥した樹脂ペレット３０が再吸湿するための水分を殆ど含まない雰囲気となる。
次に、シャッタ１２を閉じてから、真空遮断弁１３を閉じると、真空遮断弁１３のエアシリンダに設けられた近接スイッチからの閉鎖信号を受けて、ピンチバルブ７が開く。
そして、上記した樹脂ペレット３０の真空吸引及び真空乾燥の過程を必要回数繰り返す。 When the pressure gauge 5 confirms that the inside of the drying hopper 1 has returned to atmospheric pressure, the vacuum shut-off valve 13 is opened, and the shutter 12 is further opened.
Then, the resin pellets 30 that have finished drying in the drying hopper 1 fall down to the supply hopper 23.
Next, when the outside air introduction valve 19 is closed while the second vacuum pump 17 is operated, and the flow path opening / closing valve 18 is opened for about 3 to 5 seconds, the drying hopper 1, the desiccant storage tank 14, and the supply hopper 23 are opened. The inside of the supply hopper 23 is in an atmosphere that hardly contains moisture for the dried resin pellets 30 to absorb moisture again.
Next, when the shutter 12 is closed and then the vacuum shut-off valve 13 is closed, the pinch valve 7 is opened in response to a close signal from a proximity switch provided in the air cylinder of the vacuum shut-off valve 13.
The process of vacuum suction and vacuum drying of the resin pellet 30 described above is repeated as many times as necessary.

乾燥ホッパ１内における樹脂ペレット３０の真空乾燥中に真空排気量が不足した時は、流路開閉弁１８を閉じて共通排気バルブ２６を開き、第１の真空ポンプ３と第２の真空ポンプ１７とによって、乾燥ホッパ１の真空排気を行う。
一方、乾燥剤貯蔵槽１４内の乾燥剤３１が再生不良を起こした場合には、流路開閉弁４及び開閉弁１１を閉じ、共通排気バルブ２６を開き、第１の真空ポンプ３と第２の真空ポンプ１７とによって、乾燥剤貯蔵槽１４の真空排気を行う。なお、共通排気バルブ２６の開閉操作は、電気制御ボックス４１の操作部４５によって行う。
また、上記実施例では、樹脂ペレット３０を乾燥ホッパ１内で真空乾燥させている間に、第２の真空ポンプ１７を作動させて乾燥剤貯蔵槽１４の真空吸引を同時に行っているが、乾燥剤３１の吸湿量が一定以上となった場合のみ、或いは定期的に乾燥剤貯蔵槽１４の真空排気を行っても良い。 When the amount of vacuum exhaust is insufficient during the vacuum drying of the resin pellets 30 in the drying hopper 1, the flow opening / closing valve 18 is closed and the common exhaust valve 26 is opened, and the first vacuum pump 3 and the second vacuum pump 17. Then, the drying hopper 1 is evacuated.
On the other hand, when the desiccant 31 in the desiccant storage tank 14 has failed to be regenerated, the flow path on-off valve 4 and on-off valve 11 are closed, the common exhaust valve 26 is opened, and the first vacuum pump 3 and the second The desiccant storage tank 14 is evacuated by the vacuum pump 17. The opening / closing operation of the common exhaust valve 26 is performed by the operation unit 45 of the electric control box 41.
In the above embodiment, while the resin pellet 30 is vacuum-dried in the drying hopper 1, the second vacuum pump 17 is operated to perform vacuum suction of the desiccant storage tank 14 at the same time. The desiccant storage tank 14 may be evacuated only when the moisture absorption amount of the agent 31 reaches a certain level or periodically.

本発明の実施例を示す成形材料真空乾燥装置の断面図。Sectional drawing of the molding material vacuum dryer which shows the Example of this invention. 電気制御ボックスの正面図。The front view of an electric control box.

符号の説明Explanation of symbols

１ 乾燥ホッパ
２ ヒータ
３ 第１の真空ポンプ
４ 流路開閉弁
５ 圧力計
６ 防塵フィルタ
７ ピンチバルブ
８ 吸引パイプ
９ 輸送パイプ
１０ 圧力調整弁
１１ 開閉弁
１２ シャッタ
１３ 真空遮断弁
１４ 乾燥剤貯蔵槽
１５ 樹脂量監視センサ
１６ 樹脂残量監視センサ
１７ 第２の真空ポンプ
１８ 流路開閉弁
１９ 外気導入バルブ
２０ 防塵フィルタ
２１ 防塵フィルタ
２２ 乾燥空気導入バルブ
２３ 供給ホッパ
２４ 乾燥空気噴出リング
２５ 成形材料貯蔵タンク
２６ 共通排気バルブ
２８ 樹脂量監視窓
２９ 樹脂残量監視窓
３０ 樹脂ペレット
３１ 乾燥剤
３２ 排出管
３３ 排気路
３４ａ 第１流路
３４ｂ 第２流路
３５ 乾燥剤乾燥用流路
３６ 別の排気路
３７ 外気導入路
３８ 共通流路
４１ 電気制御ボックス
４２ メインスイッチ
４３ 自動温度調節計
４５ 操作部
ＡＳ エアシリンダ
DESCRIPTION OF SYMBOLS 1 Drying hopper 2 Heater 3 1st vacuum pump 4 Flow path on-off valve 5 Pressure gauge 6 Dust-proof filter 7 Pinch valve 8 Suction pipe 9 Transport pipe 10 Pressure adjustment valve 11 On-off valve 12 Shutter 13 Vacuum shut-off valve 14 Desiccant storage tank 15 Resin amount monitoring sensor 16 Resin remaining amount monitoring sensor 17 Second vacuum pump 18 Flow path opening / closing valve 19 Outside air introduction valve 20 Dustproof filter 21 Dustproof filter 22 Dry air introduction valve 23 Supply hopper 24 Dry air ejection ring 25 Molding material storage tank 26 Common exhaust valve 28 Resin amount monitoring window 29 Resin remaining amount monitoring window 30 Resin pellet 31 Desiccant 32 Discharge pipe 33 Exhaust passage 34a First passage 34b Second passage 35 Desiccant drying passage 36 Separate exhaust passage 37 Outside air Introduction path 38 Common flow path 41 Electric control box 42 Main switch 43 Temperature adjusting meter 45 operation unit AS air cylinder

Claims (3)

成形材料を収納して加熱乾燥する乾燥ホッパと、乾燥剤を貯蔵して加熱する乾燥剤貯蔵槽とを設け、前記乾燥ホッパと第１の真空ポンプとを排気路を介して連絡し、前記乾燥剤貯蔵槽に流路開閉弁を設けた外気導入路を連結し、前記乾燥ホッパの下部と前記乾燥剤貯蔵槽とを別の排気路で連絡した成形材料真空乾燥装置において、前記乾燥ホッパと前記乾燥剤貯蔵槽とを隣接して設けると共に、これら乾燥ホッパと乾燥剤貯蔵槽との境界部にヒータを設置し、該ヒータによって前記乾燥ホッパ内の成形材料及び前記乾燥剤貯蔵槽内の乾燥剤を共に加熱することを特徴とした成形材料真空乾燥装置。 A drying hopper for storing and drying the molding material and a desiccant storage tank for storing and heating the desiccant are provided, the drying hopper and the first vacuum pump are connected via an exhaust passage, and the drying is performed. In a molding material vacuum drying apparatus in which an outside air introduction path provided with a flow path opening / closing valve is connected to the agent storage tank, and the lower part of the drying hopper and the desiccant storage tank are connected by another exhaust path, the drying hopper and The desiccant storage tank is provided adjacent to the heater, and a heater is installed at the boundary between the drying hopper and the desiccant storage tank, and the heater allows the molding material in the drying hopper and the drying in the desiccant storage tank to be dried. A molding material vacuum drying apparatus characterized by heating the agent together . 前記別の排気路に流路開閉弁を設け、前記別の排気路における乾燥剤貯蔵槽と前記流路開閉弁との間を、乾燥剤乾燥用流路によって第２の真空ポンプに連絡したことを特徴とする請求項１に記載の成形材料真空乾燥装置。 A flow path opening / closing valve is provided in the another exhaust passage, and the second vacuum pump is communicated between the desiccant storage tank and the flow passage opening / closing valve in the separate exhaust passage by a drying agent drying passage. The molding material vacuum drying apparatus according to claim 1. 前記乾燥ホッパと成形材料貯蔵タンクとが輸送パイプで連絡され、前記排気路が、流路開閉弁を設けた第１流路と、圧力調整弁を設けた第２流路とを並列に有することを特徴とする請求項１乃至２のうちのいずれか１つに記載の成形材料真空乾燥装置。 The drying hopper and the molding material storage tank are connected by a transport pipe, and the exhaust passage has a first passage provided with a passage opening / closing valve and a second passage provided with a pressure regulating valve in parallel. The molding material vacuum drying apparatus according to claim 1, wherein the molding material vacuum drying apparatus is characterized by.
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