JP4313893B2

JP4313893B2 - Abrasive supply method and apparatus in blast processing

Info

Publication number: JP4313893B2
Application number: JP14386099A
Authority: JP
Inventors: 恵二間瀬; 真治神田
Original assignee: Fuji Manufacturing Co Ltd
Current assignee: Fuji Manufacturing Co Ltd
Priority date: 1999-05-24
Filing date: 1999-05-24
Publication date: 2009-08-12
Anticipated expiration: 2019-05-24
Also published as: JP2000326230A

Description

【０００１】
【発明の属する技術分野】
本発明は、ブラスト加工において研磨材圧送タンクから定量の研磨材を噴射ノズルに供給する研磨材供給方法および装置に関する。研磨材圧送タンク内の研磨材を噴射ノズルから被加工物へ定量的に噴射する、すなわち噴射量を一定に維持することは、良好で安定したブラスト加工を行うための重要なブラスト加工条件の一つであり、本発明は研磨材圧送タンク内の研磨材を定量的に噴射ノズルへ供給するための研磨材供給方法および装置に関する。
【０００２】
【従来の技術】
従来、研磨材供給装置４０としては、図６に示すように、研磨材から粉塵を分級して再使用可能な研磨材を回収する回収タンク７０の底面近傍の下部に、当該回収タンク７０の側壁から内部を通過し前記側壁の反対側の側壁７１を貫通するサクションパイプ５２を設け、前記サクションパイプ５２の上部に小径の導入孔５３を設けている。前記サクションパイプ５２の一端は研磨材供給管１４（図４）を介して噴射ノズル１３に連通し、サクションパイプ５２の他端は回収タンク７０の側壁７１の外方へ臨んでいる。
【０００３】
回収タンク７０又はこれに連通する研磨材タンク（以下、両者を含め、単に、『回収タンク』ともいう。）内の研磨材がサクションパイプ５２に設けた導入孔５３からサクションパイプ５２内へ徐々にほぼ一定の速度で落下するにつれて、回収タンク７０内の研磨材に図６に一点鎖線に示すようなすり鉢状の穴ができ、このすり鉢状の穴は次第に拡がっていく。一方、導入孔５３から落下した研磨材はサクションパイプ５２内へ円錐体を成すように積み上げられ、この円錐体の研磨材はサクションパイプ５２内を流れる空気流により噴射ノズル１３へ向けて吸引される。このように研磨材は前記すり鉢状の穴と円錐体の傾斜角がほぼ一定の角度を成し、この傾斜角を安息角θという。以上のように導入孔５３からサクションパイプ５２内へ研磨材を徐々に定量的に落下させるためには前記導入孔５３は小径にする必要があった。
【０００４】
上記のような研磨材供給装置４０は図４に示すような重力式のブラスト加工装置６０に装着されている。以下、重力式のブラスト加工装置６０について説明すると、図４及び図５において、６１はキャビネットで、被加工物を出し入れする投入口６３を備え、キャビネット６１内に前記投入口６３から投入した被加工物に研磨材を噴射する噴射ノズル１３を設ける。
【０００５】
また、前記キャビネット６１の下部にはホッパ６８が設けられ、ホッパ６８の最下端は導管６５を介してキャビネット６１の上部に設置された研磨材回収用の回収タンク７０の上部に連通する。
【０００６】
回収タンク７０は所謂サイクロンで、粉塵を研磨材から分離する装置であり、図４に示すように、上部に円筒形状を成す円筒部と、下部に下方に向けて徐々に狭くなる円錐状を成す円錐部とから成り、回収タンク７０の円筒部の上部の側壁に流入口７３を設け、この流入口７３に連通管７５を介して前記導管６５の先端を連結する。前記連通管７５の軸線方向は円筒部の横断面円形を成す内壁面の接線方向に位置しているので、連通管７５から回収タンク７０内へ流入した気流は円筒部の内壁に沿って回りながら降下してゆく。回収タンク７０の円錐部の下端は噴射ノズル１３から噴射する研磨材の噴射量を調整し供給する研磨材供給装置４０を備え、この研磨材供給装置４０を研磨材供給管１４を介して噴射ノズル１３に連通している。なお、噴射ノズル１３には図示せざる圧縮空気供給源からの圧縮空気を供給する管６２を連結している。また、前記回収タンク７０の上端壁面の略中央には連結管７４が設けられ、この連結管７４は排出管６７を介してダストコレクタ６６に連通している。
【０００７】
ダストコレクタ６６は排風機６９を回転しダストコレクタ６６内の空気を外気へ放出している。この排風機６９によりブラスト加工装置６０のキャビネット６１、導管６５、回収タンク７０内の空気を吸引し、各部がそれぞれ負圧になり、また図示せざる圧縮空気供給源から供給された空気が研磨材と共に噴射ノズル１３から噴射されるので、キャビネット６１から順に導管６５、回収タンク７０、ダストコレクタ６６へ気流が流れる。
【０００８】
前記噴射ノズル１３に圧縮空気供給源からの圧縮空気を管６２を介して供給することにより、噴射ノズル１３および研磨材供給管１４内に負圧が生じ、この負圧によりサクションパイプ５２内の研磨材が吸引されて研磨材供給管１４を経て噴射ノズル１３へ給送され、噴射ノズル１３内で研磨材と圧縮空気が混合して噴射ノズル１３から被加工物へ向けて噴射される。
【０００９】
直圧式では、図７に示すように、研磨材回収タンク７０の下方に研磨材圧送タンク１１があり、その中間に前記研磨材回収タンク７０の下方と研磨材圧送タンク１１の連通あるいは遮断する例えばダンプバルブ４１などのバルブ機構が介設され、このバルブ機構を開閉することにより、研磨材回収タンク７０と研磨材圧送タンク１１を連通・遮断する。研磨材圧送タンク１１内に圧縮空気供給管５４から圧縮空気が充満され、その圧縮空気に押されて、ダンプバルブ４１が押し上げられ研磨材回収タンク７０と研磨材圧送タンク１１とを遮断すると、圧縮空気供給管５４の圧縮空気が圧縮空気供給管５４とダンプバルブ４１下方の間隙から研磨材圧送タンク１１内に充填され、研磨材と圧縮空気の混合流体が研磨材圧送タンク１１の下部の研磨材量調整管５２内に圧送され、そこで空気と研磨材１５とが適当に混合されて、研磨材と圧縮空気の混合流体が研磨材供給管１４を経て噴射ノズル１３より噴射される。キャビネット内で噴射された研磨材および破砕された研磨材及び被加工物から出た粉塵は、除塵気流に乗って、前述の研磨材回収タンク７０の下部および、ダストコレクタに集積される。
【００１０】
前記バルブ機構の開閉手段例えばフットスイッチまたはマイクロスイッチを作動し、圧縮空気供給管５４への圧縮空気の供給を断つと、ダンプバルブ４１が自重で下方に下がり、研磨材圧送タンク１１とダストコレクタを介して大気に連通する研磨材回収タンク７０が連通し、研磨材圧送タンク１１内の圧縮空気が研磨材回収タンク１１の中に逃げて、研磨材圧送タンク１１内は大気圧になる。圧縮空気供給管５４への圧縮空気の供給を断つと同時に研磨材の噴射は止まり研磨材回収タンク１１とダンプバルブ４１との間隙から、研磨材回収タンク１１の底部に集積されている研磨材１５が一気に研磨材圧送タンク内に落下する。
【００１１】
【発明が解決しようとする課題】
従来の研磨材供給手段においては、前述した回収タンク７０及び研磨材を貯溜する単なる研磨材の貯溜タンク等を含む研磨材タンクからサクションパイプ５２へ落下する研磨材の量は、導入孔５３の大きさ、研磨材の材質、粒径、比重等の違いにより大きく左右されていた。さらに、研磨材タンク内の研磨材の量が多いときと少ないときでは研磨材タンクからサクションパイプ５２へ落下する研磨材の量や速度が異なる場合があった。研磨材を噴射ノズルから被加工物へ向けて噴射すると、被加工物へ衝突して破損した再使用不可能な研磨材は研磨材タンクで分級されてダストコトレクタ６６へ送られ廃棄される。したがって、ブラスト加工を行なうに連れて研磨材タンク内の研磨材の量が減少するため、サクションパイプ５２内への研磨材の落下量は必ずしも一定量にならないという問題点があった。
【００１２】
また、サクションパイプ５２への研磨材の落下量を安定させるために、導入孔５３を小さくしているので、研磨材内の異物が前記導入孔５３を塞いで研磨材の落下を遮断したり、あるいは設定量の研磨材が落下しないという問題点があった。
【００１３】
また、研磨材には微粉性質を示すものと微粉性質を示すさないものがある。微粉性質とは、研磨材タンク内の底部に集積した研磨材の安息角θが一定にならないほどの微粉状態を示す性質をいう。なお、研磨材が微粉性質を示す要因は、研磨材の材質、比重、粒径、及び研磨材タンク内の圧力等によって異なる。例えば、タンク内の圧力が常圧のときの微粉性質を有する研磨材の一例として、（１）アランダム系の研磨材材質で、みかけ比重が２〜３、研磨材粒径が約＃２４０以下の場合、（２）研磨材材質がスチールビーズで、みかけ比重が４、研磨材粒径が約＃６００以下の場合がある。しかし、研磨材タンク内の圧力が常圧以上になると、微粉性質を示す研磨材の比重と粒径は変化する。例えば、研磨材タンク内の圧力が５kg/cm のとき、アランダム系の研磨材材質では、研磨材粒径が＃１５０でも微粉性質を示すが、スチールビーズの研磨材材質では、研磨材粒径が＃３００で微粉性質を示さない。
【００１４】
以上のような微粉性質を示す研磨材は、従来の研磨材供給装置４０を用いると、微粉特有の相互の付着力のために互いに吸着したり研磨材タンクの壁面に付着するなどして安息角θが一定にならず、図８に示すように研磨材タンク内の研磨材は導入孔５３の直上方に穴が開いた状態になり、あるいは図９に示すように導入孔５３の上部に空洞４４を形成して研磨材が落下しなくなることがあった。
【００１５】
また、前記従来の直圧式は、エネルギー効率は、高いが、研磨材圧送タンクへの回収タンクからの研磨材導入に際して、研磨材の供給が止まり、連続噴射ができない。
【００１６】
以上のように、従来の研磨材供給方法および装置においては、研磨材タンクから常に一定量の研磨材を噴射ノズルへ供給することが難しいという問題点があった。
【００１７】
本発明は叙上の問題点を解決するために開発されたもので、研磨材圧送タンクから噴射ノズルへ定量の研磨材を安定した状態で供給するための研磨材供給方法および装置を提供し、さらに、研磨材の種類に応じて所望の研磨材供給量を容易に設定できる研磨材供給方法および装置を提供することを目的とする。
【００１８】
上記課題を解決すべく、出願人は、すでに特許第２８３１９５０号をもって、図１０に示すように、研磨材タンク１１の下部に連通し、空気取り入れ口３２を有する研磨材量調整タンク１２を備え、この研磨材量調整タンク１２を圧縮空気供給源に連通する噴射ノズル１３に研磨材供給管１４を介して連通すると共に、前記圧縮空気供給源の圧縮空気を噴射ノズル１３から噴射して生じる研磨材供給管１４内の負圧により研磨材量調整タンク１２から研磨材を吸引して噴射ノズル１３へ供給するブラスト加工装置の前記研磨材量調整タンク１２内に、例えば、凹部２２から成る補集部を円周面に形成した補集回転盤２１を回転駆動手段で回転自在に設け、且つ、前記補集回転盤２１の円周面の少なくとも一部を研磨材量調整タンク１２内に流入した研磨材内へ埋没させると共に、前記補集回転盤２１の円周面に前記研磨材供給管１４の研磨材供給方向後端の吸込口２４を近接した研磨材供給装置１０を提案しており、本願発明は直圧式の利点をさらに発展させるべく上記先行特許のさらなる改良に係るものである。
【００１９】
【課題を解決するための手段】
上記目的を達成するために、本発明の研磨材供給方法にあっては、
圧密状態の研磨材圧送タンク１１内の研磨材を研磨材供給管１４を介して圧縮空気により噴射ノズル１３へ供給し、前記噴射ノズルから被加工物に噴射するブラスト加工において、
圧縮空気を前記研磨材圧送タンク１１に供給し、且つ該研磨材圧送タンクに同圧管４５を介して圧密状態で連通する研磨材量調整タンク１２に前記圧縮空気を供給すると共に、前記研磨材圧送タンク内の研磨材を研磨材量調整タンク１２内へ給送し、少なくとも円周の一部を研磨材量調整タンク１２内に流入した研磨材内へ埋没させた補集回転盤２１の円周面で研磨材を補集し、前記円周面に端縁を接触し又は端縁を可及的に近接させて臨む研磨材供給管１４の圧送口２４から前記研磨材量調整タンク内の圧縮空気により研磨材を圧送して噴射ノズル１３へ供給すると共に、研磨材量調整管５２を介して前記研磨材供給管１４に圧縮空気を導入して前記研磨材量調整タンク１２と前記研磨材供給管１４内の相対的圧力差を調整するものである。
【００２０】
また、本発明の他の研磨材供給方法にあっては、前記研磨材量調整タンク１２内の下部に流入した研磨材で形成される研磨材層１７と、この研磨材層１７の上部の空気層１８にそれぞれ補集回転盤２１の円周の一部を埋没又は臨ませて回転させる。前記空気層１８において前記補集回転盤２１の円周面に臨む研磨材供給管１４の圧送口２４から研磨材を圧送して噴射ノズル１３へ供給するものである。
【００２１】
なお、前記研磨材量調整タンク１２内で補集回転盤２１の円周面に形成した補集部により研磨材を補集し、この補集された研磨材を研磨材供給管１４の圧送口２４から圧送して噴射ノズル１３へ供給することができる。
【００２２】
また、前記補集回転盤２１を設定回転数において回転し、任意設定量の研磨材を補集回転盤２１の円周面に臨む研磨材供給管１４の圧送口２４から圧送して噴射ノズル１３へ供給することができる。
【００２３】
さらに、前記研磨材量調整タンク１２に振動を加えて補集回転盤２１の円周面による研磨材の補集量を設定量に維持し、あるいは振動量により捕集量を調整可能とする。
【００２４】
本発明の研磨材供給装置１０にあっては、回収タンク７０に、該回収タンクに開閉自在のバルブ機構を介して連通する研磨材圧送タンク１１に圧縮空気供給管を介して圧縮空気供給源を連通し、前記研磨材圧送タンク１１を研磨材供給管１４を介して連通する噴射ノズルを備えるブラスト加工装置において、
前記研磨材圧送タンク１１に連通する研磨材量調整タンク１２を備え、且つ、該研磨材量調整タンク１２を前記研磨材圧送タンク１１に同圧管４５を介して圧密状態で連通し、前記研磨材量調整タンク１２を研磨材供給管１４を介して噴射ノズルへ連通すると共に、
前記研磨材量調整タンク１２内に、例えば、凹部（２２）から成る補集部を円周面に形成した補集回転盤２１を回転駆動手段で回転自在に設け、且つ、前記補集回転盤２１の円周面の少なくとも一部を研磨材量調整タンク１２内に流入した研磨材内へ埋没させると共に、前記補集回転盤２１の円周面に前記研磨材供給管１４の研磨材供給方向後端の圧送口２４の端縁を可及的に近接し、更に前記研磨材供給管１４に圧縮空気を導入して前記研磨材量調整タンク１２と前記研磨材供給管１４内の相対的圧力差を調整する研磨材量調整管５２を設けたものである。
【００２５】
本発明の他の研磨材供給装置１０にあっては、前記研磨材タンク１１の下部に連通する導入管１６を研磨材量調整タンク１２内に挿通して前記研磨材量調整タンク１２内の下部に流入した研磨材で成る研磨材層１７と該研磨材層１７の上部に空気層１８とを形成すると共に、例えば、凹部から成る補集部を円周面に形成した補集回転盤２１を前記研磨材層１７と空気層１８にそれぞれ前記補集回転盤２１の円周面の一部を埋没又は臨ませて回転自在に設け、前記空気層１８に臨む補集回転盤２１の円周面に前記研磨材供給管１４の研磨材供給方向後端の圧送口２４を近接したものである。
【００２６】
なお、前記補集部は、平面矩形又は円形を成す多数の凹痕から成るものでよい。
【００２７】
さらに、前記補集部は、円周方向に連続する一連の無端条溝を円周面幅方向に平行に複数形成して成るものでよい。
【００２８】
また、前記補集回転盤２１の回転速度を調整することにより、研磨材量調整タンク１２内の研磨材を設定量噴射ノズル１３へ供給する。
【００２９】
また、前記補集回転盤２１の回転速度を調整自在に設けることは、補集回転盤２１の回転速度を変えて回転数を増減させることにより噴射ノズル１３への研磨材供給量を容易に所望量に設定できるという点で望ましい。
【００３０】
さらに、前記研磨材供給管１４の圧送口２４を補集回転盤２１の幅方向を被蓋可能に臨ませて設けることは、研磨材を効率よく補集できるという点で望ましく、又、研磨材供給管１４の圧送口２４を補集回転盤２１の幅方向に細長に形成することは幅広に設けた補集回転盤２１の円周面の研磨材を全て効率よく圧送するという点で望ましい。
【００３１】
また、前記研磨材量調整タンク１２を振動するバイブレータ２８等の振動発生手段を設けることが、補集回転盤２１の円周面の凹部に研磨材を十分に入り込ませ、補集回転盤２１による研磨材補集量を定量にするという点で望ましい。
【００３２】
さらに、前記補集回転盤２１の円周面に近接又は接触するスクレーパを設けることが、補集回転盤２１の円周上の研磨材補集量を一定にするという点で望ましい。
【００３３】
【発明の実施の形態】
本発明の研磨材供給方法および装置の実施の形態について、以下に図を参照して説明する。なお、上述した従来例と同一の部材等については同一の符号を用い、従来例で説明した点と同一の構成については、省略して説明する。
【００３４】
本発明の研磨材供給装置１０を設置するブラスト加工装置は、前記被加工物へ研磨材と圧縮空気の混合流体を研磨材供給管１４を介して噴射する噴射ノズル１３を備え、且つ、被加工物を収納するキャビネットと、噴射ノズル１３から噴射された研磨材から粉塵を分離して再使用可能な研磨材を回収し貯溜する回収タンク７０にダンプバルブ４１等のバルブ機構を介して前記回収タンクを連通・遮断する研磨材圧送タンク１１とを備え、このような所謂直圧式ブラスト加工装置に送風機や排風機、圧縮機等の気流発生手段を連通して、気流を発生させ、この気流に研磨材或いは粉塵を載せてキャビネットから研磨材圧送タンク１１ないしはダストコレクタへ移送する。
【００３５】
前記研磨材圧送タンク１１の下部に研磨材圧送タンク１１と同様ダンプバルブ４１により圧密状態で研磨材量調整タンク１２を連通し、研磨材圧送タンク１１内の研磨材を研磨材量調整タンク１２へ流入させ、研磨材量調整タンク１２内の下部に流入した研磨材で形成される研磨材層１７を成し、前記研磨材圧送タンク１１と、前記研磨材量調整タンク１２内上方を同圧管４５を介して連通して、この研磨材層１７の上部にも前記研磨材圧送タンク１１内の研磨材１５上方と同圧の圧縮空気層３７が形成されるよう構成される。
【００３６】
さらに、モータ等の回転駆動手段の回転力で等速度に回転する補集回転盤２１を研磨材量調整タンク１２内の研磨材層１７に円周の一部を埋設して設け、且つ、前記補集回転盤２１の円周面の一部を前記圧縮空気層３７に露出させる。なお、前記補集回転盤２１の回転速度を調整して、噴射ノズル１３に供給する研磨材の量を容易に増減して所望の設定量に調整できる。
【００３７】
補集回転盤２１は、当該補集回転盤２１の円周面に、研磨材を補集する補集部を形成している。例えば、前記補集部は断面形状がＶ字状、四角形、Ｕ字状の凹部でもよく、この凹部の配列は補集回転盤２１の円周方向に連続する一連の無端条溝を円周面幅方向に平行に複数形成してもよい。或いは前記凹部は補集回転盤２１の幅方向に長い溝で、この溝複数を補集回転盤２１の円周方向に平行に形成することもできる。例えば、補集回転盤２１の円周面幅方向に長い板状の羽根複数枚を適宜均等間隔を介して円周面円周方向に平行に突設したものでもよい。
【００３８】
前記溝幅が研磨材の粒径より数倍の広い間隔である場合は、研磨材が前記溝の両端から落下しないようにするために前記各溝の両端を閉塞することが望ましいが、溝幅が研磨材の粒径より僅かに大きい程度の狭い間隔である場合は、研磨材が前記溝の両端から落下することが少ないので前記溝の両端を閉塞しなくともよい。また、補集部は補集回転盤２１の円周方向および幅方向に斜めに交差する溝を補集回転盤２１の円周面に形成することもできる。又、補集部は補集回転盤２１の円周面に平面矩形又は円形を成す多数の凹痕を形成したものでもよい。なお、各凹部は規則正しく配列することが、研磨材を定量的に補集するという点で望ましい。凹部としては、以上のように種々の形状を掲げることができるが、いずれにしても、凹部は研磨材を載置あるいは嵌入可能に形成して研磨材を補集できる形状であればよく、前述した形状に限定されない。
【００３９】
なお、本実施例では図２に示すように補集回転盤２１は研磨材量調整タンク２１の幅の約３分の１程度の幅にしてもよい、圧送口２４に作用する圧送力によって研磨材を圧送可能な範囲内でできるだけ幅広く形成する方が、円周面の面積が大きくなるためにより多くの研磨材を効率よく補集できるという点で望ましい。
【００４０】
さらに、前記研磨材量調整タンク１２にバイブレータ２８等の振動発生手段を連結することは、補集回転盤２１の円周面で補集される研磨材の補集量を一定にするという点で望ましい。つまり、前記振動発生手段で研磨材量調整タンク１２を振動させることにより、補集回転盤２１の円周面の凹部内に研磨材が十分に且つある程度凝集固化した状態で填め込まれるので、補集される研磨材は常に一定量となると言える。したがって、前記振動量で、捕集量が設定可能である。又、補集回転盤２１も振動することにより、凹部内に入り込む研磨材以外の余分な研磨材は振るい落とされるので研磨材補集量を均一に維持できる。
【００４１】
また、前記補集回転盤２１の円周面に、金属や樹脂等の板状もしくは棒状のスクレーパの側縁を近接又は接触させることにより、補集回転盤２１の円周面の凹部で補集される研磨材のうち一定量以外の研磨材をスクレーパの側縁で払い落として補集回転盤２１の円周面で補集される研磨材の量を一定にするという点で望ましい。なお、圧送口２４の端縁を補集回転盤２１の円周面から一定の間隔で近接させることにより当該圧送口２４をスクレーパとして用いることができる。
【００４２】
噴射ノズル１３に連通する研磨材供給管１４の研磨材供給方向後方端の圧送口２４は、前記圧縮空気層３７に露出した補集回転盤２１の円周面に近接する位置に設ける。
【００４３】
圧縮空気供給源から研磨材圧送タンク１１および研磨材量調整タンク１２へ圧縮空気を供給すると、研磨材供給管１４が低、研磨材量調整タンク１２が高という圧力差が生まれ、等速度で回転する補集回転盤２１の円周面の補集部で補集された研磨材が前記圧送口２４から圧送されて研磨材供給管１４を経て噴射ノズル１３へ供給され、常時、一定量の研磨材が噴射ノズル１３から被加工物へ噴射される。
【００４４】
なお、前述した実施の形態では、補集回転盤２１の上部が研磨材量調整タンク１２内の圧縮空気層３７に露出する場合について説明したが、本発明においては、補集回転盤２１の全体が研磨材層１７内に没している場合においても、もしくは研磨材量調整タンク１２内が研磨材で充満し、所謂研磨材量調整タンク１２内に圧縮空気層３７が形成されない場合においても適用できる。この場合、研磨材供給管１４の圧送口２４の端縁を補集回転盤２１の円周面に接触あるいはできる限り近接させることは、補集回転盤２１の円周面の凹部で補集された研磨材のみを圧送口２４から圧送するという点で望ましい。つまり、圧送口２４と補集回転盤２１の円周面との間隔が大きいと、圧送口２４の周囲の研磨材が前記間隔から圧送ないし吸引される率が多くなるために研磨材の圧送量ないしは、研磨材量調整タンク１２内の圧縮空気層３７と研磨材量調整管５２ないし研磨材供給管１４内との相対的圧力差の大小（研磨材量調整タンク１２＞研磨材量調整管５２）による吸引量とも言えるが、研磨材供給量が不安定になる要素が多くなるからである。
【００４５】
以下に、前述した本発明の研磨材供給方法および装置の実施の形態について図面を参照して具体的に説明する。
【００４６】
図１において、７０は回収タンクで、所謂サイクロンであり、粉塵を研磨材から分離する装置である。回収タンク７０の底部には粉塵を分離した後の再使用可能な研磨材１５が貯溜する。前述したように、前記回収タンク７０の底部に研磨材圧送タンク１１をダンプバルブ４１を介して連結し、この研磨材圧送タンク１１内に回収タンク７０内の研磨材１５が落下し貯溜する。
【００４７】
１２は研磨材量調整タンクで、略直方体を成す密閉型タンクである。前記研磨材圧送タンク１１の底面に連通する導入管１６を研磨材量調整タンク１２の上壁面から内部に挿通し、前記導入管１６の先端の導入口１９の面を研磨材量調整タンク１２の底面からの高さ方向で３分の２程度の位置に設けている。したがって、研磨材圧送タンク１１内の研磨材１５は導入管１６を経て下方の研磨材量調整タンク１２内へ落下流入し、研磨材量調整タンク１２内の下部に流入した研磨材で成る研磨材層１７が導入口１９の下方に形成され、当該研磨材層１７の上方に圧縮空気層３７が形成される。研磨材圧送タンク１１内の研磨材１５が研磨材量調整タンク１２内へ流入することにより研磨材層１７の上面が上昇し導入管１６の導入口１９と略同一の高さで停止する。つまり、研磨材層１７の上面が導入口１９まで上昇すると研磨材圧送タンク１１内の研磨材１５は研磨材量調整タンク１２へ流入しない。
【００４８】
したがって、研磨材量調整タンク１２内は常時、高さ方向で上方の約２分の１〜３分の１に圧縮空気層３７を形成し、下方の約２分の１〜３分の２に研磨材層１７を形成することが好ましい。
【００４９】
２１は補集回転盤で、本実施例では図２に示すように、補集回転盤２１の円周面に円周方向に連続する一連のＶ字状の無端条溝で成る溝部２２を円周面幅方向に平行に複数形成している。補集回転盤２１は研磨材量調整タンク１２内の研磨材層１７中で縦方向に回転自在に回転軸２５で軸承され、しかも前記回転軸２５は研磨材層１７の上面より下方に位置し、且つ補集回転盤２１の上部又は上部の一部分が圧縮空気層３７に露出する位置に設けている。なお、補集回転盤２１の上部とは補集回転盤２１の回転軸の中心を通過する水平線より上方に位置する部分の範囲をいう。したがって、本実施例では補集回転盤２１の円周の下半部全体は研磨材層１７内に確実に没し、且つ補集回転盤２１の円周の上半部の一部が圧縮空気層３７に露出している。したがって、補集回転盤２１が回転する時、補集回転盤２１の円周の上半部の一部分が研磨材層１７内に没しているので研磨材が溝部２２内に入り込み易くなり、研磨材層１７の研磨材が確実に圧縮空気層３７へ移送される。
【００５０】
前記回転軸２５は研磨材量調整タンク１２の外部で軸受２７により軸支され、回転軸２５の軸端にプーリ２６を設け、このプーリ２６に図示せざるモータ等の回転駆動手段に回転力を伝達するＶベルトを介して連結する。なお、前記回転駆動手段の回転速度は既知の手段により容易に調整自在に構成されている。
【００５１】
２３は圧送管で、噴射ノズル１３に連通する研磨材供給管１４の研磨材供給方向後方端に連結しており、圧送管２３の後端面は前記補集回転盤２１の円周面の幅とほぼ同じ長さに細長の圧送口２４を形成し、この圧送口２４から研磨材供給方向前方に向けて狭くなるよう形成されている。前記圧送口２４は図２に示すように、箱状、あるいは台形ないし漏斗状を成し、圧送口２４の長手方向の全長が補集回転盤２１の全幅を被蓋可能に臨ませて設け補集回転盤２１の頂点の円周面に近接している。
【００５２】
補集回転盤２１が回転駆動手段により等速度で図１の紙面上反時計回り方向に回転すると、補集回転盤２１の円周面の溝部２２内に入り込んで補集された研磨材層１７の研磨材が圧縮空気層３７へ移送される。
【００５３】
前述したように、圧縮空気供給管５４の圧縮空気が圧縮空気供給管５４とダンプバルブ４１下方の間隙から研磨材圧送タンク１１内に充填され、同時に前記研磨材量調整タンク１２内へも同圧管４５を介して圧縮空気が充填され、回転している補集回転盤２１の前記溝部２２内の研磨材が補集回転盤２１の頂点で圧送口２４から吸引ないし圧送され、研磨材と圧縮空気の混合流体が圧送口２４から圧送管２３を介して圧送され、研磨材供給管１４を経て噴射ノズル１３より噴射される。
【００５４】
尚、前記研磨材量調整管５２の末端に示す矢印は、前記圧縮空気供給管５４に流量調整弁等を介して連通し、圧縮空気を導入して、噴射量などの微調整を図るようにしても良いことを示したものであり、噴射ノズルの噴射口径など設計に応じ、研磨材圧送タンク１１内と同圧もしくは、やや低い圧力を補助圧としてかけるものであるが、当然、前記研磨材量調整管５２の末端は、これを常時閉鎖してもよい。
【００５５】
前記補集回転盤２１を等速度で回転し、補集回転盤２１の円周面で補集される研磨材の量は定量となるので、圧送口２４から吸引され噴射ノズル１３へ供給される研磨材の量が定量になる。なお、圧送口２４の端縁は前述したようにスクレーバの機能を果たし、一定量以外の研磨材を補集回転盤２１の円周面から払い落とすのでより一層確実に研磨材を定量にすることに寄与する。
【００５６】
さらに、前記研磨材量調整タンク１２の底面にバイブレータ２８を連結し、このバイブレータ２８で研磨材量調整タンク１２に振動を与えることにより、研磨材が補集回転盤２１の円周面の溝部２２内に十分に入り込み、又補集回転盤２１も振動することにより溝部２２内に入り込んだ研磨材以外の研磨材は振るい落とされるので、補集回転盤２１の円周面で補集される研磨材の量は常時、定量になり、より一層安定した状態で一定量の研磨材が補集される。したがって、噴射ノズル１３へ供給される研磨材は確実に一定量に維持される。
【００５７】
なお、補集回転盤２１の回転速度を調整することにより回転数の増減を図り、噴射ノズル１３への研磨材供給量を調整することができる。例えば、補集回転盤２１の回転速度を速くすることにより研磨材が多く供給され、補集回転盤２１の回転速度を遅くすることにより研磨材が少なく供給される。なお、補集回転盤２１の回転速度が何れの場合であっても回転速度を一定に維持することにより、常時安定した状態で一定量の研磨材が噴射ノズル１３へ供給され、定量の研磨材が噴射ノズル１３から被加工物へ噴射される。したがって、補集回転盤２１の回転速度と研磨材供給量とは相関関係にあるので、この関係式を求めて研磨材供給量を補集回転盤２１の回転速度でデジタル化することにより所望の研磨材供給量に容易に調整できる。
【００５８】
図３は、前記研磨材回収タンク７０の下方と研磨材圧送タンク１１の連通あるいは遮断するバルブ機構として、それぞれ開閉動作を交互に行う一対のピンチバルブ３８、３８を前記研磨材回収タンク７０と研磨材圧送タンク１１間に設けたもので、ピンチバルブ３８，３８はそれぞれ膨張時断面半円状中空ゴム体から成り、切欠き端面を前記研磨材回収タンク７０と研磨材圧送タンク１１間の補助タンク３５に所定間隔を介して固着し、中空部３６，３６には、それぞれピンチバルブ３８，３８作動用の圧縮空気導入管３４，３３が挿設されている。この圧縮空気導入管３４，３３に電磁弁により交互に圧縮空気を供給して前記研磨材回収タンク７０と研磨材圧送タンク１１間を圧密状態で連通遮断し、研磨材回収タンク７０内の研磨材を補助タンク３５に収納する。この構成においては、研磨材の補助タンク３５に収納されている研磨材により、研磨材圧送タンク１１内の圧力を維持したまま、研磨材を研磨材圧送タンク１１内に供給し、連続噴射ができる。
【００５９】
【発明の効果】
本発明は、以上説明したように構成されているので、以下に記載されるような効果を奏する。
【００６０】
本発明は、従来の直圧式における欠点を除去し、連続した定量噴射が可能なブラスト加工手段を提供し、いわゆる直圧式の長所である噴射圧力を高くして、したがって、高い噴射エネルギーを得ることができ、サクション式と異なり断面円形以外であっても噴射ノズルの形状を問わないため種種の加工形状に対応できると共に以下の効果を奏するものである。
【００６１】
（１）従来、研磨材は研磨材タンクから小さな導入孔を経て研磨材量調整タンクへ供給されていたので異物によるトラブルが発生しやすかったが、本発明は研磨材圧送タンクと研磨材量調整タンク間を連通する導入管の内径を小さくする必要がないので異物によるトラブルが発生しない。
【００６２】
（２）従来、研磨材圧送タンクから研磨材量調整タンク内へ落下する研磨材の量が安定しないものであったが、本発明は研磨材量調整タンク内で補集回転盤を回転させ、この補集回転盤の円周面で研磨材量調整タンク内の研磨材を定量的に補集し、この補集した研磨材を研磨材供給管の圧送口から圧送するので、研磨材圧送タンクから噴射ノズルへ確実に定量の研磨材を安定した状態で供給することができた。
【００６３】
（３）本発明は補集回転盤の回転速度を変化させて回転数を増減させることにより研磨材供給量の増減を図ることができ、また補集回転盤の回転速度に応じて研磨材を安定した状態で一定量に供給することができる。したがって、補集回転盤の回転速度を自在に調整することにより、研磨材の種類に応じて所望の研磨材供給量に確実且つ容易に調整できる。しかも、研磨材供給量に対応する補集回転盤の回転速度をデジタル化することにより所望の研磨材供給量、したがって、噴射量を容易に設定できる。
【００６４】
（４）本発明は、たとえ微粉性質を示す研磨材であっても、上記の（１）項の理由で、研磨材圧送タンクと研磨材量調整タンクとを連通する導入管の内径を大きく形成することができるので、従来のように定量に落下しないというトラブルがなく、さらに上記の（２）項の理由で、微粉性質を示す研磨材に対しても補集回転盤の円周面の補集部で研磨材を定量に補集でき、一定量の研磨材を確実に噴射ノズルへ供給できた。
【図面の簡単な説明】
【図１】本発明の実施例の研磨材供給装置の要部断面を示す正面図である。
【図２】本発明実施形態の研磨材量調整タンク内の要部断面を示す側面図である。
【図３】本発明の他の実施形態の研磨材量調整タンク内を示す斜視図である。
【図４】重力式のブラスト加工装置を示す正面図である。
【図５】重力式のブラスト加工装置を示す側面図である。
【図６】従来の研磨材供給装置の要部断面図を示し、特に微粉性質を示さない研磨材がサクションパイプ内に落下するときの研磨材の状態を示すものである。
【図７】従来の直圧式ブラスト装置を示す要部断面図である。
【図８】従来の研磨材供給装置の要部断面図を示し、特に微粉性質を示す研磨材がサクションパイプ内に落下するときの研磨材の状態を示すものである。
【図９】従来の研磨材供給装置の要部断面図を示し、特に微粉性質を示す研磨材がサクションパイプ内に落下するときの研磨材の状態を示すものである。
【図１０】本願発明に先行する研磨材量調整タンクを有する研磨材供給装置の要部断面図を示すものである。
【符号の説明】
１０研磨材供給装置
１１研磨材（圧送）タンク
１２研磨材量調整タンク
１３噴射ノズル
１４研磨材供給管
１５研磨材
１６導入管
１７研磨材層
１８空気層
１９導入口
２１補集回転盤
２２溝部（凹部）
２３圧送管
２４圧送口
２５回転軸
２６プーリ
２７軸受
２８バイブレータ（振動発生手段）
３２外気取入口
３３圧縮空気導入管
３４圧縮空気導入管
３５補助タンク
３７圧縮空気層
３８ピンチバルブ
４０研磨材供給装置
４１バルブ機構（ダンプバルブ）
４４空洞
４５同圧管
５２サクションパイプ
５３導入孔
５４圧縮空気供給管（研磨材圧送タンク１１へ）
６０ブラスト加工装置
６１キャビネット
６２管
６３投入口
６５導管
６６ダストコレクタ
６７排出管
６８ホッパ
６９排風機
７０回収タンク
７３流入口
７４連結管
７５連通管[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an abrasive material supply method and apparatus for supplying a fixed amount of abrasive material from an abrasive material pressure feeding tank to an injection nozzle in blast processing. Quantitatively injecting the abrasive in the abrasive pressure feed tank from the injection nozzle to the workpiece, that is, maintaining a constant injection amount is one of the important blasting conditions for good and stable blasting. In particular, the present invention relates to an abrasive material supply method and apparatus for quantitatively supplying an abrasive material in an abrasive pressure feeding tank to an injection nozzle.
[0002]
[Prior art]
Conventionally, as shown in FIG. 6, as the abrasive supply device 40, the side wall of the recovery tank 70 is disposed at the lower portion near the bottom of the recovery tank 70 that classifies dust from the abrasive and collects reusable abrasive. Is provided with a suction pipe 52 that passes through the inside and passes through the side wall 71 on the opposite side of the side wall, and a small-diameter introduction hole 53 is provided above the suction pipe 52. One end of the suction pipe 52 communicates with the injection nozzle 13 via the abrasive supply pipe 14 (FIG. 4), and the other end of the suction pipe 52 faces the outside of the side wall 71 of the recovery tank 70.
[0003]
  The abrasive in the recovery tank 70 or an abrasive tank communicating with the recovery tank 70 (hereinafter simply referred to as “recovery tank”) is gradually introduced into the suction pipe 52 from the introduction hole 53 provided in the suction pipe 52. FIG. 6 shows the abrasive in the recovery tank 70 as it falls at a substantially constant speed.Single pointA mortar-shaped hole is formed as shown by a chain line, and this mortar-shaped hole gradually expands. On the other hand, the abrasive dropped from the introduction hole 53 is stacked into a suction pipe 52 so as to form a cone, and the abrasive of this cone is sucked toward the injection nozzle 13 by the air flow flowing in the suction pipe 52. . Thus, in the abrasive, the angle of inclination of the mortar-shaped hole and the cone forms a substantially constant angle, and this angle of inclination is called the angle of repose θ. As described above, in order to gradually and quantitatively drop the abrasive from the introduction hole 53 into the suction pipe 52, the introduction hole 53 needs to have a small diameter.
[0004]
The abrasive supply device 40 as described above is mounted on a gravity blasting device 60 as shown in FIG. Hereinafter, the gravity type blasting apparatus 60 will be described. In FIGS. 4 and 5, reference numeral 61 denotes a cabinet, which is provided with an input port 63 for taking in and out a workpiece, and the workpiece input into the cabinet 61 from the input port 63. An injection nozzle 13 is provided for injecting abrasive on the object.
[0005]
Further, a hopper 68 is provided at the lower part of the cabinet 61, and the lowermost end of the hopper 68 communicates with an upper part of a recovery tank 70 for recovering abrasives installed at the upper part of the cabinet 61 through a conduit 65.
[0006]
The recovery tank 70 is a so-called cyclone and is a device that separates dust from the abrasive. As shown in FIG. 4, the recovery tank 70 has a cylindrical portion that forms a cylindrical shape at the top and a conical shape that gradually narrows downward at the bottom. The inlet port 73 is provided on the upper side wall of the cylindrical portion of the recovery tank 70, and the leading end of the conduit 65 is connected to the inlet port 73 through the communication pipe 75. Since the axial direction of the communication pipe 75 is located in the tangential direction of the inner wall surface forming a circular cross section of the cylindrical portion, the airflow flowing into the recovery tank 70 from the communication pipe 75 rotates along the inner wall of the cylindrical portion. Going down. The lower end of the conical portion of the recovery tank 70 is provided with an abrasive supply device 40 that adjusts and supplies the amount of abrasive sprayed from the spray nozzle 13, and this abrasive supply device 40 is sprayed through the abrasive supply pipe 14. 13 communicates. A pipe 62 that supplies compressed air from a compressed air supply source (not shown) is connected to the injection nozzle 13. Further, a connecting pipe 74 is provided in the approximate center of the upper end wall surface of the recovery tank 70, and this connecting pipe 74 communicates with the dust collector 66 through a discharge pipe 67.
[0007]
The dust collector 66 rotates the exhaust fan 69 and discharges the air in the dust collector 66 to the outside air. The air in the cabinet 61, the conduit 65, and the recovery tank 70 of the blast processing device 60 is sucked by the exhaust fan 69, and each part has a negative pressure. The air supplied from a compressed air supply source (not shown) is used as an abrasive. At the same time, since the air is injected from the injection nozzle 13, the airflow flows from the cabinet 61 to the conduit 65, the recovery tank 70 and the dust collector 66 in order.
[0008]
By supplying compressed air from a compressed air supply source to the injection nozzle 13 via a pipe 62, negative pressure is generated in the injection nozzle 13 and the abrasive supply pipe 14, and this negative pressure causes polishing in the suction pipe 52. The material is sucked and fed to the injection nozzle 13 through the abrasive supply pipe 14, and the abrasive and compressed air are mixed in the injection nozzle 13 and injected from the injection nozzle 13 toward the workpiece.
[0009]
In the direct pressure type, as shown in FIG. 7, there is an abrasive pressure feed tank 11 below the abrasive material recovery tank 70, and the lower part of the abrasive material recovery tank 70 and the abrasive material pressure feed tank 11 communicate with or be cut off in the middle. A valve mechanism such as a dump valve 41 is interposed. By opening and closing the valve mechanism, the abrasive recovery tank 70 and the abrasive pressure feeding tank 11 are communicated and disconnected. When the compressed air is filled from the compressed air supply pipe 54 into the abrasive pressure feed tank 11 and pushed by the compressed air, the dump valve 41 is pushed up to shut off the abrasive recovery tank 70 and the abrasive pressure feed tank 11. The compressed air in the air supply pipe 54 is filled into the abrasive pressure feeding tank 11 from the gap below the compressed air supply pipe 54 and the dump valve 41, and the mixed fluid of the abrasive and compressed air is the abrasive in the lower part of the abrasive pressure feeding tank 11. The air and the abrasive 15 are appropriately mixed in the quantity adjusting pipe 52, and the mixed fluid of the abrasive and the compressed air is injected from the injection nozzle 13 through the abrasive supply pipe 14. The abrasives sprayed in the cabinet, the crushed abrasives, and the dust discharged from the workpiece ride on the dust removal airflow and are collected in the lower part of the aforementioned abrasive recovery tank 70 and in the dust collector.
[0010]
When the valve mechanism opening / closing means such as a foot switch or a micro switch is operated to stop the supply of compressed air to the compressed air supply pipe 54, the dump valve 41 is lowered by its own weight, and the abrasive pressure feed tank 11 and the dust collector are lowered. Accordingly, the abrasive recovery tank 70 communicating with the atmosphere communicates, and the compressed air in the abrasive pressure feed tank 11 escapes into the abrasive recovery tank 11, and the pressure in the abrasive pressure feed tank 11 becomes atmospheric pressure. At the same time as the supply of compressed air to the compressed air supply pipe 54 is cut off, the injection of the abrasive stops and the abrasive 15 accumulated at the bottom of the abrasive recovery tank 11 from the gap between the abrasive recovery tank 11 and the dump valve 41. Falls into the abrasive pressure feed tank at once.
[0011]
[Problems to be solved by the invention]
In the conventional abrasive material supply means, the amount of the abrasive material falling from the abrasive material tank including the recovery tank 70 and the mere abrasive material storage tank for storing the abrasive material to the suction pipe 52 is the size of the introduction hole 53. It was greatly influenced by the difference in the material, particle size, specific gravity and the like of the abrasive. Further, the amount and speed of the abrasive falling from the abrasive tank to the suction pipe 52 may differ depending on whether the amount of abrasive in the abrasive tank is large or small. When the abrasive is sprayed from the injection nozzle toward the workpiece, the non-reusable abrasive that collides with the workpiece and is damaged is classified in the abrasive tank, sent to the dust collector 66, and discarded. Therefore, since the amount of abrasive in the abrasive tank decreases as blasting is performed, there is a problem in that the amount of abrasive falling into the suction pipe 52 is not necessarily constant.
[0012]
In addition, since the introduction hole 53 is made small in order to stabilize the amount of the abrasive falling on the suction pipe 52, foreign matter in the abrasive closes the introduction hole 53 to block the fall of the abrasive. Or there was a problem that a set amount of abrasive did not fall.
[0013]
Further, there are abrasives that show fine powder properties and those that do not show fine powder properties. The fine powder property refers to a property showing a fine powder state such that the repose angle θ of the abrasive accumulated at the bottom in the abrasive tank is not constant. The factor that the abrasive exhibits fine powder properties varies depending on the material, specific gravity, particle size, pressure in the abrasive tank, and the like. For example, as an example of an abrasive having fine powder properties when the pressure in the tank is normal pressure, (1) an alundum type abrasive material with an apparent specific gravity of 2-3 and an abrasive particle size of about # 240 or less In this case, (2) the abrasive material may be steel beads, the apparent specific gravity may be 4, and the abrasive particle size may be about # 600 or less. However, when the pressure in the abrasive tank becomes equal to or higher than normal pressure, the specific gravity and particle size of the abrasive exhibiting fine powder properties change. For example, when the pressure in the abrasive tank is 5 kg / cm 2, the alundum abrasive material shows fine powder properties even when the abrasive particle size is # 150, but the abrasive particle size of steel beads is the abrasive particle size. No. # 300 does not show fine powder properties.
[0014]
  When the conventional abrasive supply device 40 is used, the abrasive having the fine powder property as described above is adsorbed to each other due to the mutual adhesive force unique to the fine powder or adheres to the wall surface of the abrasive tank. θ is not constant,8As shown in FIG. 4, the abrasive in the abrasive tank is in a state where a hole is opened immediately above the introduction hole 53, or9As shown in FIG. 3, the cavity 44 is formed in the upper portion of the introduction hole 53, and the abrasive may not fall.
[0015]
In addition, the conventional direct pressure type has high energy efficiency, but when the abrasive is introduced from the recovery tank into the abrasive pressure feed tank, the supply of the abrasive is stopped and continuous injection cannot be performed.
[0016]
As described above, the conventional abrasive supply method and apparatus have a problem that it is difficult to always supply a fixed amount of abrasive from the abrasive tank to the injection nozzle.
[0017]
The present invention was developed to solve the above problems, and provides an abrasive supply method and apparatus for supplying a fixed amount of abrasive from an abrasive pressure feed tank to an injection nozzle in a stable state, Furthermore, it aims at providing the abrasive | polishing material supply method and apparatus which can set the desired abrasive | polishing material supply amount easily according to the kind of abrasive | polishing material.
[0018]
  In order to solve the above problems, the applicant has alreadyJapanese Patent No. 2931950As shown in FIG. 10, there is provided an abrasive quantity adjustment tank 12 that communicates with the lower part of the abrasive tank 11 and has an air intake port 32, and an injection that communicates this abrasive quantity adjustment tank 12 with a compressed air supply source. The nozzle 13 communicates with the abrasive supply pipe 14 and polishes from the abrasive quantity adjustment tank 12 by the negative pressure in the abrasive supply pipe 14 generated by injecting the compressed air of the compressed air supply source from the injection nozzle 13. In the polishing material amount adjusting tank 12 of the blast processing apparatus that sucks the material and supplies it to the injection nozzle 13, for example, a collecting rotating disk 21 having a collecting portion formed of a concave portion 22 formed on the circumferential surface is rotated. And at least a part of the circumferential surface of the collection turntable 21 is buried in the abrasive that has flowed into the abrasive amount adjustment tank 12, and the circumference of the collection turntable 21 surface The abrasive supply device 10 is proposed in which the suction port 24 at the rear end of the abrasive supply direction of the abrasive supply pipe 14 is close. The present invention is a further improvement of the above-mentioned prior patent in order to further develop the advantages of the direct pressure type. It is concerned.
[0019]
[Means for Solving the Problems]
  In order to achieve the above object, in the abrasive supply method of the present invention,
  In the blasting process in which the abrasive in the compacted abrasive pressure feeding tank 11 is supplied to the injection nozzle 13 by compressed air through the abrasive supply pipe 14 and injected from the injection nozzle onto the workpiece.
  Compressed air is supplied to the abrasive pressure feed tank 11, and the compressed air is supplied to the abrasive amount adjustment tank 12 communicating with the abrasive pressure feed tank in a compacted state via the same pressure pipe 45, and the abrasive pressure feed The circumference of the collection turntable 21 in which the abrasive in the tank is fed into the abrasive quantity adjustment tank 12 and at least a part of the circumference is buried in the abrasive that has flowed into the abrasive quantity adjustment tank 12. Abrasive material is collected on the surface, and the circumferential surfaceTouching edges or bringing edges as close as possibleThe abrasive is pumped from the pressure feed port 24 of the facing abrasive feed pipe 14 by the compressed air in the abrasive quantity adjustment tank and supplied to the injection nozzle 13.At the same time, compressed air is introduced into the abrasive supply pipe 14 via the abrasive quantity adjustment pipe 52 to adjust the relative pressure difference between the abrasive quantity adjustment tank 12 and the abrasive supply pipe 14.Is.
[0020]
In another abrasive supply method of the present invention, the abrasive layer 17 formed of the abrasive that has flowed into the lower part of the abrasive amount adjustment tank 12 and the air above the abrasive layer 17 are provided. Each layer 18 is rotated with a part of the circumference of the collection turntable 21 buried or faced. In the air layer 18, the abrasive is pumped from the pumping port 24 of the abrasive feed pipe 14 facing the circumferential surface of the collecting turntable 21 and supplied to the injection nozzle 13.
[0021]
The abrasive material is collected by a collecting portion formed on the circumferential surface of the collecting turntable 21 in the abrasive material amount adjusting tank 12, and the collected abrasive material is pumped into the pressure supply port of the abrasive material supply pipe 14. It can be pumped from 24 and supplied to the injection nozzle 13.
[0022]
Further, the collecting turntable 21 is rotated at a set rotation speed, and an arbitrarily set amount of abrasive is pumped from the pumping port 24 of the abrasive supply pipe 14 facing the circumferential surface of the collecting turntable 21 to inject the injection nozzle 13. Can be supplied to.
[0023]
Further, the abrasive amount adjustment tank 12 is vibrated to maintain the collection amount of the abrasive material by the circumferential surface of the collection turntable 21 at a set amount, or the collection amount can be adjusted by the vibration amount.
[0024]
  In the abrasive material supply apparatus 10 of the present invention, a compressed air supply source is connected to the recovery tank 70 via the compressed air supply pipe to the abrasive pressure feed tank 11 that communicates with the recovery tank via a valve mechanism that can be freely opened and closed. In a blasting apparatus comprising an injection nozzle that communicates with the abrasive pressure feed tank 11 via an abrasive supply pipe 14;
  An abrasive amount adjustment tank 12 communicating with the abrasive pressure feed tank 11 is provided, and the abrasive amount adjustment tank 12 is communicated with the abrasive pressure feed tank 11 through the same pressure pipe 45 in a compacted state. The quantity adjustment tank 12 is communicated with the injection nozzle through the abrasive supply pipe 14, and
  In the polishing material amount adjusting tank 12, for example, a collecting turntable 21 in which a collecting portion including a concave portion (22) is formed on the circumferential surface is provided rotatably by a rotation driving means, and the collecting turntable At least a part of the circumferential surface of the abrasive 21 is buried in the abrasive that has flowed into the abrasive amount adjustment tank 12, and the abrasive supply direction of the abrasive supply pipe 14 is arranged on the circumferential surface of the collecting turntable 21. Pumping port 24 at the rear endEdge ofTheAs much as possibleCloseFurther, an abrasive material amount adjusting tube 52 is provided for introducing a compressed air into the abrasive material supplying tube 14 to adjust a relative pressure difference between the abrasive material amount adjusting tank 12 and the abrasive material supplying tube 14.It is a thing.
[0025]
In another abrasive supply device 10 according to the present invention, an introduction pipe 16 communicating with the lower part of the abrasive tank 11 is inserted into the abrasive quantity adjustment tank 12 and the lower part in the abrasive quantity adjustment tank 12 is inserted. An abrasive layer 17 made of an abrasive that has flowed into the air and an air layer 18 on the upper part of the abrasive layer 17 are formed, and, for example, a collecting turntable 21 having a collecting portion made of a recess formed on the circumferential surface is provided. A part of the circumferential surface of the collecting turntable 21 is embedded in or exposed to each of the abrasive layer 17 and the air layer 18 so as to be rotatable, and the circumferential surface of the collecting turntable 21 facing the air layer 18. Further, the pressure supply port 24 at the rear end in the abrasive supply direction of the abrasive supply pipe 14 is close.
[0026]
In addition, the said collection part may consist of many concave marks which comprise a planar rectangle or a circle.
[0027]
Further, the collecting portion may be formed by forming a plurality of endless grooves continuous in the circumferential direction in parallel with the circumferential width direction.
[0028]
Further, the abrasive in the abrasive quantity adjustment tank 12 is supplied to the set quantity injection nozzle 13 by adjusting the rotational speed of the collecting turntable 21.
[0029]
In addition, the rotational speed of the collecting turntable 21 can be adjusted in an adjustable manner by easily changing the rotational speed of the collecting turntable 21 and increasing / decreasing the number of revolutions so that the abrasive supply amount to the injection nozzle 13 is desired. It is desirable in that it can be set to a quantity.
[0030]
Further, it is desirable to provide the pressure feed port 24 of the abrasive supply pipe 14 so that the width direction of the collection rotating disk 21 faces the cover so that the abrasive can be collected efficiently. Forming the feed port 14 of the supply pipe 14 to be elongated in the width direction of the collection turntable 21 is desirable in that all the abrasive on the circumferential surface of the collection turntable 21 provided wide is efficiently pumped.
[0031]
Further, providing a vibration generating means such as a vibrator 28 that vibrates the abrasive amount adjusting tank 12 causes the abrasive to sufficiently enter the concave portion of the circumferential surface of the collecting rotating disk 21, and the collecting rotating disk 21. This is desirable in that the amount of collected abrasive is quantified.
[0032]
Furthermore, it is desirable to provide a scraper that is close to or in contact with the circumferential surface of the collecting turntable 21 in that the amount of collected abrasive on the circumference of the collecting turntable 21 is constant.
[0033]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of an abrasive material supply method and apparatus according to the present invention will be described below with reference to the drawings. In addition, about the member same as the prior art example mentioned above, the same code | symbol is used, and it abbreviate | omits and demonstrates the structure same as the point demonstrated by the prior art example.
[0034]
A blasting apparatus provided with the abrasive material supply device 10 of the present invention includes an injection nozzle 13 for injecting a mixed fluid of an abrasive material and compressed air to the workpiece through an abrasive material supply pipe 14, and to be processed. The collection tank is connected to a recovery tank 70 for separating and storing reusable abrasives by separating dust from the abrasives sprayed from the spray nozzle 13 and a valve mechanism such as a dump valve 41. And an abrasive pressure feed tank 11 that communicates and shuts off the air, and an air flow generating means such as a blower, an exhaust fan, and a compressor is connected to such a so-called direct pressure blasting apparatus to generate an air current, and the air current is polished to the air current. The material or dust is placed and transferred from the cabinet to the abrasive pressure feeding tank 11 or the dust collector.
[0035]
Abrasive material amount adjusting tank 12 is communicated with the lower portion of the abrasive material pressure feeding tank 11 in a compacted state by a dump valve 41 in the same manner as the abrasive material pressure feeding tank 11. A polishing material layer 17 is formed which is made of the polishing material flowing into the lower portion of the polishing material amount adjusting tank 12 and formed above the polishing material pressure feeding tank 11 and the upper portion of the polishing material amount adjusting tank 12. Thus, a compressed air layer 37 having the same pressure as that above the abrasive 15 in the abrasive pressure feeding tank 11 is also formed on the upper part of the abrasive layer 17.
[0036]
Further, a collecting turntable 21 that rotates at a constant speed by the rotational force of a rotational driving means such as a motor is provided with a part of the circumference embedded in the abrasive layer 17 in the abrasive amount adjustment tank 12, and A part of the circumferential surface of the collection turntable 21 is exposed to the compressed air layer 37. It should be noted that the rotational speed of the collecting turntable 21 can be adjusted to easily increase or decrease the amount of abrasive supplied to the injection nozzle 13 to a desired set amount.
[0037]
The collection turntable 21 forms a collection portion for collecting abrasives on the circumferential surface of the collection turntable 21. For example, the collecting portion may be a concave portion having a V-shaped, quadrangular or U-shaped cross section, and the arrangement of the concave portions is a series of endless grooves continuous in the circumferential direction of the collecting turntable 21 on the circumferential surface. A plurality may be formed parallel to the width direction. Alternatively, the concave portion is a groove that is long in the width direction of the collection rotating disk 21, and a plurality of the grooves can be formed in parallel to the circumferential direction of the collection rotating disk 21. For example, a plurality of plate-like blades that are long in the circumferential surface width direction of the collection rotating disk 21 may be provided so as to protrude in parallel to the circumferential surface circumferential direction through appropriate equal intervals.
[0038]
When the groove width is several times wider than the grain size of the abrasive, it is desirable to close both ends of each groove so that the abrasive does not fall from both ends of the groove. However, if the gap is narrow enough to be slightly larger than the particle size of the abrasive, the abrasive does not fall from both ends of the groove, so that both ends of the groove need not be closed. The collecting portion can also form grooves on the circumferential surface of the collecting turntable 21 that obliquely intersect the circumferential direction and the width direction of the collecting turntable 21. In addition, the collecting portion may be formed by forming a large number of concave marks forming a planar rectangle or a circle on the circumferential surface of the collecting turntable 21. In addition, it is desirable that the recesses are regularly arranged in terms of collecting the abrasive material quantitatively. As the concave portion, various shapes can be mentioned as described above. In any case, the concave portion may be any shape as long as it can collect the abrasive by placing or inserting the abrasive. The shape is not limited.
[0039]
In this embodiment, as shown in FIG. 2, the collection rotating disk 21 may have a width of about one third of the width of the abrasive amount adjustment tank 21, and polishing is performed by a pumping force acting on the pumping port 24. It is desirable to form the material as widely as possible within the range where the material can be pumped, because the area of the circumferential surface becomes large and more abrasives can be collected efficiently.
[0040]
Furthermore, connecting the vibration generating means such as the vibrator 28 to the abrasive amount adjusting tank 12 makes the amount of collected abrasive collected on the circumferential surface of the collecting turntable 21 constant. desirable. That is, by vibrating the abrasive amount adjustment tank 12 by the vibration generating means, the abrasive is sufficiently and sufficiently agglomerated and solidified in the concave portion of the circumferential surface of the collecting turntable 21. It can be said that the amount of abrasive collected is always constant. Therefore, the amount of collection can be set by the amount of vibration. Further, since the collecting turntable 21 also vibrates, excess abrasive material other than the abrasive material entering the recess is shaken off, so that the abrasive material collection amount can be maintained uniformly.
[0041]
Further, by bringing a side edge of a plate-like or bar-like scraper such as metal or resin close to or in contact with the circumferential surface of the collecting turntable 21, the collecting turntable 21 collects at the concave portion on the circumferential face. It is desirable in that the amount of abrasive collected on the circumferential surface of the collecting turntable 21 is made constant by scraping off abrasives other than a certain amount among the abrasives to be collected at the side edges of the scraper. In addition, the said pumping port 24 can be used as a scraper by making the edge of the pumping port 24 approach from the circumferential surface of the collection turntable 21 at a fixed interval.
[0042]
The pressure feed port 24 at the rear end in the abrasive supply direction of the abrasive supply pipe 14 communicating with the injection nozzle 13 is provided at a position close to the circumferential surface of the collection rotating disk 21 exposed to the compressed air layer 37.
[0043]
When compressed air is supplied from the compressed air supply source to the abrasive pressure feed tank 11 and the abrasive amount adjustment tank 12, a pressure difference is generated in which the abrasive supply pipe 14 is low and the abrasive amount adjustment tank 12 is high, and the pressure difference rotates. The polishing material collected by the collecting portion on the circumferential surface of the collecting turntable 21 is pumped from the pumping port 24 and supplied to the spray nozzle 13 through the polishing material supply pipe 14, and a constant amount of polishing is always performed. The material is injected from the injection nozzle 13 onto the workpiece.
[0044]
In the above-described embodiment, the case where the upper part of the collecting turntable 21 is exposed to the compressed air layer 37 in the abrasive amount adjustment tank 12 has been described. However, in the present invention, the entire collecting turntable 21 is exposed. Is also applied to the case where the material is immersed in the abrasive material layer 17 or the case where the abrasive material amount adjustment tank 12 is filled with the abrasive material and the compressed air layer 37 is not formed in the so-called abrasive material amount adjustment tank 12. it can. In this case, bringing the edge of the pressure feed port 24 of the abrasive supply pipe 14 into contact with or as close as possible to the circumferential surface of the collecting turntable 21 is collected by the concave portion of the circumferential surface of the collecting turntable 21. It is desirable in that only the abrasive is pumped from the pumping port 24. That is, if the gap between the pressure feed port 24 and the circumferential surface of the collection turntable 21 is large, the rate at which the abrasive around the pressure feed port 24 is pumped or sucked from the gap increases. Or, the relative pressure difference between the compressed air layer 37 in the abrasive material amount adjusting tank 12 and the abrasive material amount adjusting tube 52 or the abrasive material supply tube 14 (the abrasive material amount adjusting tank 12> the abrasive material amount adjusting tube 52). This is because there are many factors that make the abrasive supply amount unstable.
[0045]
Hereinafter, embodiments of the above-described abrasive supply method and apparatus of the present invention will be specifically described with reference to the drawings.
[0046]
In FIG. 1, reference numeral 70 denotes a recovery tank, which is a so-called cyclone, which is an apparatus for separating dust from an abrasive. The reusable abrasive 15 after separating the dust is stored at the bottom of the recovery tank 70. As described above, the abrasive pressure feed tank 11 is connected to the bottom of the recovery tank 70 via the dump valve 41, and the abrasive 15 in the recovery tank 70 falls into the abrasive pressure feed tank 11 and is stored.
[0047]
Reference numeral 12 denotes an abrasive amount adjustment tank, which is a sealed tank having a substantially rectangular parallelepiped shape. An introduction pipe 16 communicating with the bottom surface of the abrasive pressure feed tank 11 is inserted from the upper wall surface of the abrasive quantity adjustment tank 12 into the inside, and the surface of the introduction port 19 at the tip of the introduction pipe 16 is inserted into the abrasive quantity adjustment tank 12. It is provided at a position about 2/3 in the height direction from the bottom surface. Accordingly, the abrasive 15 in the abrasive pressure feeding tank 11 drops and flows into the lower abrasive amount adjustment tank 12 through the introduction pipe 16 and is made of the abrasive that flows into the lower portion of the abrasive amount adjustment tank 12. The layer 17 is formed below the inlet 19, and the compressed air layer 37 is formed above the abrasive layer 17. When the abrasive 15 in the abrasive pressure feed tank 11 flows into the abrasive amount adjustment tank 12, the upper surface of the abrasive layer 17 rises and stops at substantially the same height as the inlet 19 of the introduction pipe 16. That is, when the upper surface of the abrasive layer 17 rises to the introduction port 19, the abrasive 15 in the abrasive pressure feed tank 11 does not flow into the abrasive amount adjustment tank 12.
[0048]
Accordingly, the inside of the abrasive material amount adjusting tank 12 is always formed with the compressed air layer 37 in the upper half of the upper half in the height direction, and in the lower half of the lower half. It is preferable to form the abrasive layer 17.
[0049]
Reference numeral 21 denotes a collecting turntable. In this embodiment, as shown in FIG. 2, a groove portion 22 formed of a series of V-shaped endless grooves continuous in the circumferential direction on the circumferential surface of the collecting turntable 21 is circular. A plurality are formed in parallel with the circumferential width direction. The collection turntable 21 is supported by a rotary shaft 25 so as to be rotatable in the vertical direction in the abrasive layer 17 in the abrasive amount adjustment tank 12, and the rotary shaft 25 is positioned below the upper surface of the abrasive layer 17. The upper part of the collection turntable 21 or a part of the upper part is provided at a position where it is exposed to the compressed air layer 37. The upper part of the collection turntable 21 refers to a range of a portion located above a horizontal line passing through the center of the rotation axis of the collection turntable 21. Therefore, in this embodiment, the entire lower half of the circumference of the collecting turntable 21 is surely submerged in the abrasive layer 17 and a part of the upper half of the circumference of the collecting turntable 21 is compressed air. Exposed to layer 37. Therefore, when the collecting turntable 21 rotates, a part of the upper half of the circumference of the collecting turntable 21 is submerged in the abrasive layer 17, so that the abrasive easily enters the groove portion 22 and is polished. The abrasive of the material layer 17 is reliably transferred to the compressed air layer 37.
[0050]
The rotary shaft 25 is pivotally supported by a bearing 27 outside the abrasive amount adjustment tank 12, and a pulley 26 is provided at the shaft end of the rotary shaft 25, and rotational force is applied to a rotary drive means such as a motor (not shown) on the pulley 26. It connects via the V belt which transmits. The rotational speed of the rotational drive means is configured to be easily adjustable by known means.
[0051]
Reference numeral 23 denotes a pressure feed pipe connected to the rear end of the abrasive feed pipe 14 communicating with the injection nozzle 13 in the abrasive feed direction, and the rear end face of the pressure feed pipe 23 has a width of the circumferential surface of the collecting turntable 21. An elongated pumping port 24 is formed in substantially the same length, and is formed so as to narrow toward the front in the abrasive supply direction from the pumping port 24. As shown in FIG. 2, the pumping port 24 has a box shape, a trapezoidal shape, or a funnel shape. The longitudinal length of the pumping port 24 is provided so that the entire width of the collecting rotating disk 21 can be covered. It is close to the circumferential surface at the apex of the collection rotating disk 21.
[0052]
When the collection rotating disk 21 is rotated counterclockwise on the paper surface of FIG. 1 at a constant speed by the rotation driving means, the abrasive layer 17 that has entered and collected in the groove portion 22 on the circumferential surface of the collection rotating disk 21. The abrasive is transferred to the compressed air layer 37.
[0053]
As described above, the compressed air in the compressed air supply pipe 54 is filled into the abrasive pressure feeding tank 11 from the gap below the compressed air supply pipe 54 and the dump valve 41, and at the same time, the same pressure pipe is also introduced into the abrasive quantity adjusting tank 12. The abrasive in the groove 22 of the rotating collection rotating disk 21 is filled with compressed air through 45 and is sucked or pumped from the pumping port 24 at the apex of the collecting rotation disk 21, and the abrasive and the compressed air The mixed fluid is pumped from the pumping port 24 through the pumping pipe 23 and is jetted from the jet nozzle 13 through the abrasive supply pipe 14.
[0054]
The arrow shown at the end of the abrasive amount adjusting pipe 52 communicates with the compressed air supply pipe 54 via a flow rate adjusting valve or the like, and introduces compressed air to finely adjust the injection amount. According to the design such as the injection nozzle diameter of the injection nozzle, the same pressure as the inside of the abrasive pressure feed tank 11 or a slightly lower pressure is applied as an auxiliary pressure. The end of the quantity adjusting tube 52 may be closed at all times.
[0055]
Since the amount of the abrasive collected on the circumferential surface of the collection turntable 21 is fixed by rotating the collection turntable 21 at a constant speed, it is sucked from the pumping port 24 and supplied to the injection nozzle 13. The amount of abrasive is quantitative. As described above, the edge of the pumping port 24 functions as a scraper, and the abrasive material other than a certain amount is removed from the circumferential surface of the collecting turntable 21, so that the abrasive material can be quantified more reliably. Contribute to.
[0056]
Further, a vibrator 28 is connected to the bottom surface of the abrasive material amount adjusting tank 12, and the vibrator 28 applies vibrations to the abrasive material amount adjusting tank 12, whereby the abrasive material is grooved 22 on the circumferential surface of the collection rotating disk 21. Since the polishing material other than the polishing material that has entered the groove portion 22 is shaken off when the collecting rotating disk 21 vibrates, the polishing that is collected on the circumferential surface of the collecting rotating disk 21. The amount of material is always fixed, and a certain amount of abrasive is collected in a more stable state. Therefore, the abrasive supplied to the injection nozzle 13 is reliably maintained at a constant amount.
[0057]
In addition, by adjusting the rotation speed of the collection turntable 21, the number of rotations can be increased and decreased, and the amount of abrasive supplied to the injection nozzle 13 can be adjusted. For example, a large amount of abrasive is supplied by increasing the rotational speed of the collecting turntable 21, and a small amount of abrasive is supplied by reducing the rotational speed of the collecting turntable 21. It should be noted that a constant amount of abrasive is supplied to the injection nozzle 13 in a constantly stable state by keeping the rotational speed constant regardless of the rotational speed of the collection turntable 21, and a fixed amount of abrasive. Is jetted from the jet nozzle 13 to the workpiece. Accordingly, since the rotational speed of the collecting turntable 21 and the abrasive supply amount are correlated, the relational expression is obtained and the abrasive supply amount is digitized by the rotational speed of the collecting turntable 21 to obtain a desired value. It is easy to adjust the abrasive supply amount.
[0058]
FIG. 3 shows a pair of pinch valves 38, 38 that alternately open and close as a valve mechanism for communicating or blocking between the lower part of the abrasive recovery tank 70 and the abrasive pressure feed tank 11. The pinch valves 38 and 38 are each formed of a hollow rubber body having a semicircular cross section when expanded, and the notch end face is an auxiliary tank between the abrasive recovery tank 70 and the abrasive pressure supply tank 11. 35 are fixed to each other at a predetermined interval, and compressed air introduction pipes 34 and 33 for operating pinch valves 38 and 38 are inserted into the hollow portions 36 and 36, respectively. Compressed air is alternately supplied to the compressed air introduction pipes 34 and 33 by electromagnetic valves to cut off communication between the abrasive recovery tank 70 and the abrasive pressure feed tank 11 in a compacted state, and the abrasive in the abrasive recovery tank 70 Is stored in the auxiliary tank 35. In this configuration, the abrasive contained in the abrasive auxiliary tank 35 is supplied to the abrasive pressurizing tank 11 while maintaining the pressure in the abrasive pressurizing tank 11, and continuous injection can be performed. .
[0059]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
[0060]
The present invention eliminates the drawbacks of the conventional direct pressure type, provides a blasting means capable of continuous quantitative injection, increases the injection pressure, which is the advantage of the so-called direct pressure type, and thus obtains high injection energy. Unlike the suction type, the shape of the injection nozzle is not limited even if it is other than a circular cross section, so that it can cope with various processing shapes and has the following effects.
[0061]
(1) Conventionally, since the abrasive was supplied from the abrasive tank to the abrasive quantity adjustment tank through a small introduction hole, troubles due to foreign matter were likely to occur. However, the present invention is directed to the abrasive pressure feed tank and the abrasive quantity adjustment. Since there is no need to reduce the inner diameter of the introduction pipe communicating between the tanks, troubles due to foreign matter do not occur.
[0062]
(2) Conventionally, the amount of abrasive falling from the abrasive pressure feed tank into the abrasive amount adjustment tank was not stable, but the present invention rotates the collecting turntable in the abrasive amount adjustment tank, The abrasive in the abrasive volume adjustment tank is collected quantitatively on the circumferential surface of this collection rotating disk, and this collected abrasive is pumped from the pumping port of the abrasive supply pipe. From the above, it was possible to reliably supply a fixed amount of abrasive material to the injection nozzle.
[0063]
(3) The present invention can increase or decrease the amount of abrasives supplied by changing the rotational speed of the collection rotating disk to increase or decrease the rotational speed. A constant amount can be supplied in a stable state. Therefore, by freely adjusting the rotational speed of the collecting turntable, it is possible to reliably and easily adjust the desired abrasive supply amount according to the type of abrasive. In addition, by digitizing the rotational speed of the collecting turntable corresponding to the abrasive supply amount, the desired abrasive supply amount, and hence the injection amount, can be easily set.
[0064]
(4) In the present invention, even if the abrasive material exhibits fine powder properties, the inner diameter of the introduction pipe that connects the abrasive pressure feeding tank and the abrasive material amount adjusting tank is made large for the reason of the above item (1). Therefore, there is no trouble that it does not fall in a fixed amount as in the past, and for the reason of the above item (2), it is also possible to compensate the circumferential surface of the collecting rotating disk even for abrasives exhibiting fine powder properties. Abrasive material could be collected in a fixed amount at the collecting part, and a certain amount of abrasive material could be reliably supplied to the injection nozzle.
[Brief description of the drawings]
FIG. 1 is a front view showing a cross section of a main part of an abrasive material supply apparatus according to an embodiment of the present invention.
FIG. 2 is a side view showing a cross section of the main part in the abrasive material amount adjustment tank of the embodiment of the present invention.
FIG. 3 is a perspective view showing the inside of an abrasive material amount adjusting tank according to another embodiment of the present invention.
FIG. 4 is a front view showing a gravity blasting apparatus.
FIG. 5 is a side view showing a gravity type blasting apparatus.
FIG. 6 is a cross-sectional view of a main part of a conventional abrasive supply device, and particularly shows the state of an abrasive when an abrasive that does not exhibit fine powder properties falls into a suction pipe.
FIG. 7 is a cross-sectional view of a main part showing a conventional direct pressure blasting apparatus.
FIG. 8 is a cross-sectional view of a main part of a conventional abrasive supply device, and particularly shows the state of an abrasive when an abrasive exhibiting fine powder properties falls into a suction pipe.
FIG. 9 is a cross-sectional view of a main part of a conventional abrasive supply device, and particularly shows the state of the abrasive when an abrasive exhibiting fine powder properties falls into a suction pipe.
FIG. 10 is a cross-sectional view of the main part of an abrasive material supply apparatus having an abrasive material amount adjusting tank prior to the present invention.
[Explanation of symbols]
10 Abrasive supply device
11 Abrasive (pressure feed) tank
12 Abrasive volume adjustment tank
13 Injection nozzle
14 Abrasive supply pipe
15 Abrasive
16 Introduction pipe
17 Abrasive layer
18 Air layer
19 Introduction
21 Collecting turntable
22 Groove (recess)
23 Pumping tube
24 Pressure feed port
25 Rotating shaft
26 pulley
27 Bearing
28 Vibrator (vibration generating means)
32 Outside air intake
33 Compressed air introduction pipe
34 Compressed air introduction pipe
35 Auxiliary tank
37 Compressed air layer
38 Pinch valve
40 Abrasive supply device
41 Valve mechanism (dump valve)
44 cavity
45 Same pressure pipe
52 Suction pipe
53 Introduction hole
54 Compressed air supply pipe (to abrasive pressure tank 11)
60 Blasting equipment
61 cabinet
62 tubes
63 slot
65 conduit
66 Dust collector
67 discharge pipe
68 Hopper
69 Ventilator
70 Recovery tank
73 Inlet
74 Connecting pipe
75 communication pipe

Claims

In the blasting process in which the abrasive in the compacted abrasive pressure feeding tank is supplied to the injection nozzle by compressed air through the abrasive supply pipe, and is injected from the injection nozzle onto the workpiece.
Compressed air is supplied to the abrasive pressure feed tank, and the compressed air is supplied to an abrasive amount adjustment tank communicating with the abrasive pressure feed tank in a compacted state via the same pressure pipe. Feed the abrasive into the abrasive volume adjustment tank,
At least a part of the circumference is rotated in the abrasive volume adjusting tank, and the polishing rotating disk is buried in the abrasive flowing into the abrasive volume adjusting tank, and polished on the circumferential surface of the collecting rotating disk. Abrasive material is collected by compressed air in the abrasive amount adjusting tank from a pressure feed port of an abrasive material supply pipe facing the edge or contacting the edge as close as possible to the circumferential surface. While being pumped and supplied to the injection nozzle , compressed air is introduced into the abrasive supply pipe via the abrasive quantity adjustment pipe to adjust the relative pressure difference between the abrasive quantity adjustment tank and the abrasive supply pipe. An abrasive supply method in blasting characterized by the above.

A part of the circumference of the collecting turntable is buried or exposed in the abrasive layer formed of the abrasive that has flowed into the lower part of the abrasive quantity adjustment tank and the compressed air layer on the upper part of the abrasive layer. 2. The blasting apparatus according to claim 1, wherein the abrasive is pumped and supplied to the injection nozzle from a pumping port of the abrasive supply pipe facing the circumferential surface of the collecting rotating disk in the compressed air layer. Abrasive supply method in processing.

The abrasive material is collected by a collecting part formed on the circumferential surface of the collecting rotating disk in the abrasive amount adjusting tank, and the collected abrasive material is pumped from the pressure supply port of the abrasive material supply pipe and injected. The method for supplying an abrasive in blasting according to claim 1 or 2, wherein the abrasive is supplied to a nozzle.

The said collection rotating disk is rotated at a set rotational speed, and an arbitrarily set amount of abrasive is pumped from the pumping port of the abrasive supply pipe facing the circumferential surface of the collecting rotating disk and supplied to the injection nozzle. 3. A method for supplying an abrasive in blasting according to any one of 3 above.

The method for supplying abrasives in blast processing according to any one of claims 1 to 4, wherein vibration is applied to the abrasive quantity adjustment tank.

A compressed air supply source is connected to the recovery tank via a compressed air supply pipe to an abrasive pressure feed tank that communicates with the recovery tank via a valve mechanism that can be opened and closed. The abrasive pressure feed tank is connected to the recovery tank via an abrasive supply pipe. In a blasting apparatus having an injection nozzle communicating with each other,
An abrasive amount adjusting tank communicating with the abrasive pressure feeding tank is provided, and the abrasive amount adjusting tank is communicated with the abrasive pressure feeding tank in a compacted state via the same pressure pipe, and the abrasive amount adjusting tank is polished. While communicating with the injection nozzle through the material supply pipe,
A collecting turntable having a collecting portion formed on the circumferential surface thereof is rotatably provided in the polishing material amount adjusting tank by a rotation driving means, and at least a part of the circumferential surface of the collecting turntable is polished. It is buried in the abrasive that has flowed into the material adjustment tank, and the edge of the pumping port at the rear end of the abrasive supply direction of the abrasive supply pipe is as close as possible to the circumferential surface of the collecting rotating disk Further , a blasting process is provided , further comprising an abrasive amount adjusting pipe for adjusting a relative pressure difference between the abrasive amount adjusting tank and the abrasive supplying pipe by introducing compressed air into the abrasive supplying pipe. Abrasive supply device.

An introduction pipe communicating with the lower part of the abrasive pressure feeding tank is inserted into the abrasive quantity adjustment tank and flows into the lower part of the abrasive quantity adjustment tank. And forming a compressed air layer and a collecting turntable having a collecting portion formed on the circumferential surface thereof, wherein a part of the circumferential surface of the collecting turntable is buried or exposed in the abrasive layer and the air layer, respectively. 7. A blasting assembly as set forth in claim 6, wherein the blasting port is provided close to a circumferential end surface of the collecting turntable facing the compressed air layer, and a pumping port at the rear end of the abrasive supply pipe in the abrasive supply direction. Abrasive supply device in processing.

The abrasive supply device in blast processing according to claim 6 or 7, wherein the collecting portion is formed by forming a plurality of continuous endless grooves in the circumferential direction in parallel with the circumferential surface width direction.

The abrasive supply device in blast processing according to claim 6 or 7, wherein the collecting portion is composed of a number of concave marks having a planar rectangular shape or a circular shape.

The abrasive material supply apparatus in blast processing according to any one of claims 6 to 9, wherein the pressure supply port of the abrasive material supply pipe is provided so that the circumferential surface width direction of the collecting turntable faces the cover.

The abrasive | polishing material supply apparatus in the blast process of any one of Claims 6-10 which provided the scraper which adjoins or contacts the circumferential surface of the said collection rotation disk.