JP3379800B2 - High pressure urethane injection device - Google Patents
High pressure urethane injection deviceInfo
- Publication number
- JP3379800B2 JP3379800B2 JP28578293A JP28578293A JP3379800B2 JP 3379800 B2 JP3379800 B2 JP 3379800B2 JP 28578293 A JP28578293 A JP 28578293A JP 28578293 A JP28578293 A JP 28578293A JP 3379800 B2 JP3379800 B2 JP 3379800B2
- Authority
- JP
- Japan
- Prior art keywords
- raw material
- mixing head
- temperature
- tank
- discharge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
- B29B7/76—Mixers with stream-impingement mixing head
- B29B7/7615—Mixers with stream-impingement mixing head characterised by arrangements for controlling, measuring or regulating, e.g. for feeding or proportioning the components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
- B29B7/58—Component parts, details or accessories; Auxiliary operations
- B29B7/72—Measuring, controlling or regulating
- B29B7/726—Measuring properties of mixture, e.g. temperature or density
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/80—Component parts, details or accessories; Auxiliary operations
- B29B7/801—Valves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/80—Component parts, details or accessories; Auxiliary operations
- B29B7/82—Heating or cooling
- B29B7/823—Temperature control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/80—Component parts, details or accessories; Auxiliary operations
- B29B7/82—Heating or cooling
- B29B7/826—Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
- B29B7/76—Mixers with stream-impingement mixing head
- B29B7/7663—Mixers with stream-impingement mixing head the mixing head having an outlet tube with a reciprocating plunger, e.g. with the jets impinging in the tube
- B29B7/7684—Parts; Accessories
- B29B7/7689—Plunger constructions
- B29B7/7694—Plunger constructions comprising recirculation channels; ducts formed in the plunger
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Nozzles (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Molding Of Porous Articles (AREA)
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】この発明は、高圧ウレタン注入装
置に関する。
【０００２】
【従来の技術】高圧ウレタン注入装置は、ポリオール側
原料とイソシアネート側原料を各原料タンクからミキシ
ングヘッドへ圧送し、そのミキシングヘッドで衝突混合
させた後にミキシングヘッド先端の吐出口から吐出させ
るものである。
【０００３】従来の高圧ウレタン注入装置は、図２に示
すように、ポリオール側原料タンク６１とイソシアネー
ト側原料タンク６２の各々が、各原料を圧送するための
原料圧送用ポンプｐ1 ，ｐ2 を備えた供給配管６３，６
４と、戻り配管６５，６６とを介してミキシングヘッド
６８に連結されている。また、前記供給配管６３，６４
はミキシングヘッド６８の手前で、高低圧切替弁６９，
７０を介して迂回用配管７１，７２により戻り配管６
５，６６に連結されている。一方、前記戻り配管６５，
６６における迂回用配管連結部７３，７４と各原料タン
ク６１，６２の戻り側間には熱交換器７５，７６が設け
られている。
【０００４】図中７７は各原料タンク温調用の恒温水
槽、p3は恒温水用ポンプ、７９は熱交換器用の冷水槽、
p4は冷水用ポンプである。また、ミキシングヘッド６８
には各原料温度を測定するセンサーt1，t2が設けられて
いて、その検出温度に応じて、各原料タンクと恒温水槽
間にある電磁バルブb1，b2の開閉及び熱交換器と冷水槽
間にある電磁バルブb3，b4の開閉を行い、各原料タンク
側へ流れる恒温水の量及び熱交換器側へ流れる冷水の量
を調節し、各原料温度が一定になるようにしている。な
お、t3ないしt6は各原料タンクから供給される各原料の
温度あるいは各原料タンクへ戻る各原料の温度を測定す
るセンサーである。
【０００５】この従来の高圧ウレタン注入装置にあって
は、まず高低圧切替弁６９，７０により迂回用配管７
１，７２が開かれて吐出準備状態とされる。そして、各
原料タンク６１，６２から各原料が供給配管６３，６４
へ圧送される。供給配管６３，６４へ圧送された各原料
は、迂回用配管７１，７２を通って戻り配管６５，６６
へ流れ、熱交換器７５，７６で冷却された後に各原料タ
ンク６１，６２へ戻る。その後再び供給配管６３，６４
へ圧送され、迂回用配管７１，７２を通って前記循環を
繰り返す。なお、熱交換器による各原料の冷却は、各原
料の圧送による圧縮発熱および循環時の摩擦による発熱
を吸収して温度上昇を防ぐためである。
【０００６】しばらく前記の原料循環を続けて、各原料
温度、粘度等が安定した時点で、高低圧切替弁６９，７
０により迂回用配管７１，７２が閉鎖され、吐出状態と
される。これにより、各原料タンク６１，６２から圧送
された各原料は、迂回用配管７１，７２を通ることなく
ミキシングヘッド６８に圧送され、ミキシングヘッド６
８で衝突混合した後ミキシングヘッドの吐出口６９から
吐出する。吐出終了後は、次の吐出時まで再び迂回用配
管７１，７２が開かれて、前記吐出準備状態とされる。
【０００７】ところで、ウレタンの反応は、原料混合時
の原料温度に影響を受けるため、良好な反応を行うに
は、混合直前位置で所定温度になるよう各原料の温度管
理を行うことが好ましい。
【０００８】しかし、従来にあっては前記のように吐出
準備段階の循環時、各原料は迂回用配管７１，７２を通
って循環しミキシングヘッド６８を通らない。そのた
め、ミキシングヘッドの温度測定センサーt1，t2は、前
回の吐出時にミキシングヘッド６８に滞留した各原料の
温度を測定することになり、混合直前の各原料温度とは
相違した測定温度になる。したがって、その測定温度に
基づいて各原料タンクの温調及び熱交換器による冷却が
なされることになり、各原料の混合直前位置における温
度を所定温度にし難かった。しかも、前記循環時の各原
料の流量は、吐出時の混合比に合わせた流量にされるも
のの、圧送のエネルギー効率等の点から比較的少なくさ
れるため、熱交換器７５，７６における熱交換能力を充
分に発揮できなかった。
【０００９】そのため、従来の装置にあっては、外気温
によって供給配管部分等が受ける影響、あるいは生産量
に伴う循環時間の変動等を、その都度作業者が考慮して
熱交換器、各原料タンク、冷水槽及び恒温水槽の温度調
整及びバルブ調整をしなければならない煩わしさがあっ
た。また、高低圧切替弁の作動不良によるトラブルも生
じ易かった。
【００１０】
【発明が解決しようとする課題】そこで、この発明は前
記の点に鑑みてなされたもので、各原料を混合直前位置
で容易に所定の温度にすることができ、しかも高低圧切
替弁の作動不良による問題を無くした高圧ウレタン注入
装置を提供するものである。
【００１１】
【課題を解決するための手段】この発明は、ポリオール
側原料タンク及びイソシアネート側原料タンクから圧送
される各原料を、非吐出時には混合することなく前記各
原料タンクに戻して循環し、他方吐出時には原料温度測
定センサーを設けたミキシングヘッドで混合して吐出す
る高圧ウレタン注入装置において、前記吐出時及び非吐
出循環時に各原料タンクからミキシングヘッドへ各原料
を圧送する往路配管と、前記非吐出循環時にミキシング
ヘッドから各原料タンクへ各原料を戻す復路配管とによ
り、前記各原料タンクをミキシングヘッドに連結する一
方、各原料タンクから復路配管へ各原料を圧送する補助
循環用配管により、前記各原料タンクの原料供給側を復
路配管途中に連結し、前記復路配管における補助循環用
配管との連結部と各原料タンク間には熱交換器を設けた
ことを特徴とする高圧ウレタン注入装置に係る。
【００１２】
【作用】非吐出循環時、各原料は吐出時における流量よ
り少ない流量、すなわち低圧で各原料タンクから往路配
管へ圧送され、ミキシングヘッドに到る。ミキシングヘ
ッドに到った各原料は、原料温度測定センサーで温度が
測定され、互いに混合されることなくそのままミキシン
グヘッドから復路配管に到り、熱交換器を通った後各原
料タンクへ戻る循環を繰り返す。また、前記ミキシング
ヘッドへ向かう原料とは別に、各原料タンクから補助循
環用配管を通って復路配管に到る原料が圧送される。そ
の原料は、復路配管で前記ミキシングヘッドから戻って
来る各原料と合流した後、熱交換器を経て各原料タンク
へ戻る。そのため、熱交換器を通る各原料の流量は、混
合比率に調整されて往路配管に圧送された各原料と、補
助循環用配管に圧送された各原料との和になり、効率良
く熱交換するのに充分な流量になる。
【００１３】また、前記非吐出循環時、ミキシングヘッ
ドの原料温度測定センサーは、そのミキシングヘッドを
通る各原料の温度を測定するため、常に吐出直前位置の
原料温度を測定することになる。そして、吐出時には、
それまで前記のような循環状態にあった各原料が、ミキ
シングヘッドで互いに混合されてミキシングヘッド先端
から吐出する。
【００１４】
【実施例】以下添付の図面に従ってこの発明を詳細に説
明する。図１はこの発明の一実施例を示す高圧ウレタン
注入装置の構造を示す図である。この高圧ウレタン注入
装置は、ポリオール側原料タンク１１、イソシアネート
側原料タンク１２及びミキシングヘッド２１を備える。
ポリオール側原料タンク１１は、ポリウレタン原料のポ
リオール側原料、すなわちポリオールに触媒、架橋剤及
び発泡剤等を混合した原料を収納するタンクである。一
方、イソシアネート側原料タンク１２は、ポリウレタン
原料のイソシアネート側原料を収納するタンクである。
各原料タンク１１，１２の外周部は、電磁弁Ｂ1 ，Ｂ2
及びポンプＰ3 を介して恒温水槽１５と接続され、その
恒温水槽１５から供給される恒温水によって各原料タン
ク１１，１２内の原料が所望温度に維持されるようにな
っている。
【００１５】なお、電磁弁Ｂ1 ，Ｂ2 の開閉は、ミキシ
ングヘッド２１に設けた後記原料温度測定センサーＴ
1 , Ｔ2 による測定値に対応して行なわれ、その電磁弁
の開閉によって恒温水槽１５から各原料タンク１１，１
２側へ流れる恒温水の量が調節される。また、恒温水槽
１５と冷水槽５１の設定温度も、ミキシングヘッド２１
に設けた原料温度測定センサーＴ1 , Ｔ2 により制御さ
れる。
【００１６】ミキシングヘッド２１は、高圧ウレタン注
入装置のミキシングヘッドとして用いられている公知の
ものが使用できる。一例として、前進後退可能なロッド
（図示せず）が内部に収納され、該ロッドと略直交する
壁部に各原料流入口と戻り口が、少なくとも前記各原料
流入口が前記ロッドを挟んで互いに対向するように形成
され、ヘッド先端には吐出口２３が形成されたものを挙
げる。このミキシングヘッド２１は、前記各原料流入口
からミキシングヘッド内に圧入される各原料がロッドの
後退により互いに衝突混合し、先端の吐出口２３から吐
出する。また、前記ロッドが前進して各原料流入口間を
遮り、各原料流入口と戻り口をロッド側面で連通する。
それにより、各原料の流入口からミキシングヘッド２１
内に入った各原料は、互いに衝突混合することなく各原
料の戻り口からミキシングヘッド２１外へ流れる。
【００１７】また、前記ミキシングヘッド２１には、原
料温度測定センサーＴ1 ，Ｔ2 が、その感知部がミキシ
ングヘッド２１内の各原料通路近くに位置するように設
けられている。この原料温度測定センサーＴ1 ，Ｔ
2 は、図示しない制御装置を介して前記原料タンク温調
用電磁弁Ｂ1 ，Ｂ2 及び後記する熱交換器用電磁弁
Ｂ3 ，Ｂ4 と接続されていて、検出温度の値に応じて原
料タンク温調用電磁弁Ｂ1 ，Ｂ2 及び熱交換器用電磁弁
Ｂ3 ，Ｂ4 の開閉、並びに恒温水槽１５と冷水槽５１の
温度制御を行なうようになっている。
【００１８】前記各原料タンク１１，１２とミキシング
ヘッド２１は、往路配管３１，３２と復路配管４１，４
２を介して連結されている。往路配管３１，３２は、一
端が各原料タンク１１，１２の原料供給側に接続され、
他端がミキシングヘッド２１の前記原料流入口に接続さ
れている。この往路配管３１，３２には原料圧送ポンプ
Ｐ1 ，Ｐ2 が設けられている。３３，３４はポンプ
Ｐ1 ，Ｐ2 用のインバータモータである。またＴ3 ，Ｔ
4 は、各原料タンク１１，１２から往路配管３１，３２
へ圧送される各原料の温度を測定する原料温度測定セン
サーである。
【００１９】復路配管４１，４２は、一端が各原料タン
ク１１，１２の原料戻り側に接続され、他端がミキシン
グヘッド２１の前記原料戻り口に接続されている。この
復路配管４１，４２の途中は、補助原料圧送ポンプ
Ｐ5 ，Ｐ6 を備えた補助循環用配管４３，４４を介して
各原料タンク１１，１２の供給側と連結されている。ま
た、復路配管４１，４２において、補助循環用配管４
３，４４との接続部４５，４６と各原料タンク１１，１
２の戻り側との間には、熱交換器４７，４８が設けられ
ている。この熱交換器４７，４８は、熱交換器用電磁弁
Ｂ3 ，Ｂ4 及びポンプＰ4 を介して共通の冷水槽５１と
連結されている。熱交換器用電磁弁Ｂ3 ，Ｂ4は、前記
のように制御装置を介してミキシングヘッド２１の原料
温度測定センサーＴ1 ，Ｔ2 と連結している。なお、Ｔ
5 ，Ｔ6 は各原料タンクへ戻る各原料の温度を測定する
センサーである。
【００２０】このようにしてなるウレタン高圧注入装置
は作動時、まず非吐出循環状態にされる。その際、ミキ
シングヘッド２１内のロッドが前進して、ミキシングヘ
ッド２１の各原料流入口と各原料戻り口がロッドの側面
で連通した状態とされる。その状態で、所定温度の各原
料が、原料圧送ポンプＰ1 ，Ｐ2 によって各原料タンク
１１，１２から往路配管３１，３２に圧送されるととも
に、補助原料圧送ポンプＰ5 ，Ｐ6 によって補助循環用
配管４３，４４に圧送される。この時、往路配管３１，
３２に圧送されるポリオール側原料とイソシアネート側
原料の流量比は、各原料の配合に応じて定まる吐出時の
混合比と等しくされ、又流量はインバータモータ３３，
３４によって吐出時より小とされる。一方補助循環用配
管４３，４４に圧送されるポリオール側原料とイソシア
ネート側原料の流量は、熱交換器による効率の良い熱交
換を考慮して定められる。
【００２１】往路配管３１，３２に圧送された各原料
は、ミキシングヘッド２１の原料流入口からミキシング
ヘッド２１内に流入し、互いに混合することなく原料戻
り口からミキシングヘッド２１外へ流出して復路配管４
１，４２へ至る。一方、補助循環用配管４３，４４に圧
送された各原料は復路配管４１，４２に至り、前記ミキ
シングヘッド２１を経て戻って来た各原料と各々合流し
た後、各原料タンク１１，１２へ向けて復路配管４１，
４２を圧送される。この合流した各原料は、途中熱交換
器４７，４８を通って所定温度に冷却された後に各原料
タンク１１，１２へ戻り、その後この循環が繰り返され
る。その際、前記合流した各原料が熱交換器４７，４８
を通るため、熱交換に必要な充分な流量となり、各原料
が効率良く冷却される。
【００２２】また、前記非吐出循環時、ミキシングヘッ
ド２１を通る各原料の温度は、ミキシングヘッド２１に
設けられた原料温度測定センサーＴ1 ，Ｔ2 により常時
測定される。そしてその測定温度と予め設定した原料の
混合吐出温度との差に応じて、前記原料タンク温調用電
磁弁Ｂ1 ，Ｂ2 及び熱交換器用電磁弁Ｂ3 ，Ｂ4 の開閉
がなされて、ミキシングヘッド２１を通る各原料の温度
が、設定した混合吐出温度になるようにされる。
【００２３】なお、前記測定温度と設定温度との比較、
原料タンク温調用電磁弁Ｂ1 ，Ｂ2と熱交換器用電磁弁
Ｂ3 ，Ｂ4 の開閉命令は、前記制御装置により行っても
よく、あるいはその制御装置を設けることなく、原料温
度測定センサーＴ1 ，Ｔ2 の測定値に応じて作業者が電
磁弁Ｂ1 ，・・の開閉を行ってもよい。
【００２４】次いで、原料の混合吐出がなされる。その
混合吐出は、インバータモータ３３，３４によって原料
圧送ポンプＰ1 ，Ｐ2 の圧を上げ、又ミキシングヘッド
２１内のロッドを後退させることによりなされる。それ
によりミキシングヘッド２１の各原料流入口が直接対向
し、前記往路配管３１，３２を通ってミキシングヘッド
２１の原料流入口からミキシングヘッド２１内に圧送さ
れた高圧の各原料が互いに衝突混合し、ミキシングヘッ
ド２１の吐出口２３から吐出される。この間も各原料は
補助循環用配管４３，４４を通って循環する。また、原
料温度測定センサーＴ1 ，Ｔ2 によりミキシングヘッド
２１内の各原料温度が測定され、その測定温度に応じて
各原料の温度調節がなされる。なお、吐出終了後再び前
記非吐出循環状態とされて次の吐出に備えられる。
【００２５】
【発明の効果】以上図示し説明したように、この発明に
よれば、常時各原料がミキシングヘッドを通るため、そ
のミキシングヘッドに設けた原料温度測定センサーによ
り、混合吐出直前位置における各原料の温度を測定でき
る。したがって、その測定温度に基づいて各原料の温度
調節を行なえば、各原料の混合直前位置における温度を
きわめて容易に適正値にすることができる。
【００２６】しかも、前記ミキシングヘッドを通って循
環する各原料と、補助循環用配管を通って循環する各原
料が合流した後に熱交換器を通るため、熱交換器を通る
各原料の流量は、効率良い熱交換に必要とされる充分な
量となり、原料温度調節が効率よくなされる。また、高
低圧切替弁を必要としないため、その高低圧切替弁の作
動不良による問題も生じない。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure urethane injection device. 2. Description of the Related Art In a high-pressure urethane injection apparatus, a polyol-side raw material and an isocyanate-side raw material are pressure-fed from respective raw material tanks to a mixing head. Things. In a conventional high-pressure urethane injection apparatus, as shown in FIG. 2, each of a polyol-side raw material tank 61 and an isocyanate-side raw material tank 62 is provided with raw material pumps p 1 and p 2 for pumping each raw material. Supply piping 63, 6 provided
4 and the return pipes 65 and 66 are connected to the mixing head 68. Further, the supply pipes 63, 64
Is in front of the mixing head 68, and the high / low pressure switching valve 69,
70 and return pipe 6 by detour pipes 71 and 72.
5,66. On the other hand, the return pipe 65,
Heat exchangers 75 and 76 are provided between the bypass pipe connecting portions 73 and 74 at 66 and the return sides of the raw material tanks 61 and 62. In the figure, 77 is a constant temperature water tank for controlling the temperature of each raw material tank, p 3 is a constant temperature water pump, 79 is a cold water tank for a heat exchanger,
p 4 is a cold water pump. Also, the mixing head 68
Are provided with sensors t 1 and t 2 for measuring the temperature of each raw material, and according to the detected temperature, opening and closing of electromagnetic valves b 1 and b 2 between each raw material tank and the constant temperature water tank, and a heat exchanger. Open and close the electromagnetic valves b 3 and b 4 between the cold water tanks and adjust the amount of constant temperature water flowing to each raw material tank side and the amount of cold water flowing to the heat exchanger side so that each raw material temperature becomes constant. ing. Incidentally, the t 3 no t 6 is a sensor for measuring the temperature of each raw material back to the temperature or the raw material tank of the raw material supplied from the raw material tank. In this conventional high-pressure urethane injection device, first, a bypass pipe 7 is operated by high-low pressure switching valves 69 and 70.
1, 72 are opened to be in the ejection preparation state. Then, the respective raw materials are supplied from the respective raw material tanks 61, 62 to the supply pipes 63, 64.
To be pumped. The raw materials pumped to the supply pipes 63 and 64 pass through the bypass pipes 71 and 72 and return pipes 65 and 66.
After being cooled by the heat exchangers 75 and 76, it returns to the raw material tanks 61 and 62. After that, supply pipes 63 and 64 are again
And the circulation is repeated through the bypass pipes 71 and 72. The cooling of each raw material by the heat exchanger is performed to prevent the temperature from rising by absorbing the compression heat generated by the pressure feeding of each raw material and the heat generated by friction during circulation. After circulating the raw material for a while, when the temperature, viscosity, etc. of each raw material are stabilized, the high / low pressure switching valves 69, 7
By 0, the bypass pipes 71 and 72 are closed to be in a discharge state. As a result, the raw materials fed from the raw material tanks 61 and 62 are fed to the mixing head 68 without passing through the bypass pipes 71 and 72, and
After the collision mixing in step 8, the mixture is discharged from the discharge port 69 of the mixing head. After the discharge is completed, the bypass pipes 71 and 72 are opened again until the next discharge, and the discharge preparation state is established. Since the reaction of urethane is affected by the temperature of the raw materials at the time of mixing the raw materials, it is preferable to control the temperature of each raw material to a predetermined temperature immediately before mixing in order to perform a good reaction. However, in the prior art, at the time of circulation in the discharge preparation stage as described above, each raw material circulates through the bypass pipes 71 and 72 and does not pass through the mixing head 68. Therefore, the temperature measurement sensors t 1 and t 2 of the mixing head measure the temperature of each raw material staying in the mixing head 68 at the time of the previous ejection, and the measured temperature is different from each raw material temperature immediately before mixing. . Therefore, the temperature control of each raw material tank and the cooling by the heat exchanger are performed based on the measured temperature, and it is difficult to set the temperature of each raw material immediately before mixing to a predetermined temperature. In addition, although the flow rate of each raw material during the circulation is set to a flow rate corresponding to the mixing ratio at the time of discharge, the flow rate is relatively small in view of the energy efficiency of pumping and the like, so that the heat exchange in the heat exchangers 75 and 76 is performed. I could not fully demonstrate my ability. Therefore, in the conventional apparatus, the heat exchanger and each raw material are taken into consideration by the operator in consideration of the influence of the outside air temperature on the supply pipe section or the like, or the fluctuation of the circulation time due to the production amount. There has been troublesome adjustment of the temperature and valves of the tank, the cold water tank and the constant temperature water tank. In addition, troubles due to poor operation of the high / low pressure switching valve were likely to occur. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and it is possible to easily set each raw material at a predetermined temperature immediately before mixing, and to switch between high and low pressures. An object of the present invention is to provide a high-pressure urethane injection device that eliminates problems caused by poor operation of a valve. According to the present invention, the raw materials pressure-fed from the polyol-side raw material tank and the isocyanate-side raw material tank are circulated back to the raw material tanks without mixing during non-discharge. On the other hand, in a high-pressure urethane injection device for mixing and discharging by a mixing head provided with a raw material temperature measuring sensor at the time of discharge, an outgoing pipe for pressure-feeding each raw material from each raw material tank to the mixing head during the discharge and non-discharge circulation; The return pipes returning the respective raw materials from the mixing head to the respective raw material tanks during the discharge circulation connect the respective raw material tanks to the mixing head, and the auxiliary circulation pipes for pressure-feeding the respective raw materials from the respective raw material tanks to the return pipes. The raw material supply side of each raw material tank is connected in the middle of the return pipe, and the auxiliary circulation pipe in the return pipe is connected. And a heat exchanger is provided between the connection portion of the high pressure urethane and each raw material tank. During non-discharge circulation, each raw material is pressure-fed from each raw material tank to the outgoing pipe at a flow rate smaller than the flow rate at the time of discharge, that is, at a low pressure, and reaches the mixing head. The temperature of each raw material that reaches the mixing head is measured by a raw material temperature measurement sensor, and the mixture goes from the mixing head directly to the return pipe without being mixed with each other, returns to each raw material tank after passing through the heat exchanger, and circulates. repeat. Further, separately from the raw material heading to the mixing head, the raw material that reaches the return piping from each raw material tank through the auxiliary circulation piping is pumped. The raw material joins with each raw material returning from the mixing head through a return pipe, and then returns to each raw material tank via a heat exchanger. Therefore, the flow rate of each raw material passing through the heat exchanger is adjusted to a mixing ratio, and is the sum of each raw material that is pressure-fed to the outgoing piping and each raw material that is pressure-fed to the auxiliary circulation piping, thereby performing efficient heat exchange. The flow rate is sufficient for During the non-discharge circulation, the raw material temperature measuring sensor of the mixing head measures the temperature of each raw material passing through the mixing head, so that the raw material temperature at the position immediately before the discharge is always measured. And at the time of ejection,
The raw materials which have been circulated as described above are mixed with each other by the mixing head and discharged from the tip of the mixing head. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a view showing a structure of a high-pressure urethane injection apparatus showing one embodiment of the present invention. The high-pressure urethane injection device includes a polyol-side raw material tank 11, an isocyanate-side raw material tank 12, and a mixing head 21.
The polyol-side raw material tank 11 is a tank for storing a polyol-side raw material of a polyurethane raw material, that is, a raw material in which a polyol, a catalyst, a crosslinking agent, a foaming agent, and the like are mixed. On the other hand, the isocyanate-side raw material tank 12 is a tank for storing the isocyanate-side raw material of the polyurethane raw material.
The outer peripheral portions of the raw material tanks 11 and 12 are connected to solenoid valves B 1 and B 2
And through the pump P 3 is connected to a constant temperature water bath 15, so that the material in the material tank 11, 12 is maintained at the desired temperature by a constant temperature water supplied from the constant-temperature water bath 15. The opening and closing of the solenoid valves B 1 and B 2 is controlled by a raw material temperature measuring sensor T provided on the mixing head 21.
1, T 2, which are performed in response to the measured values.
The amount of constant temperature water flowing to the two sides is adjusted. Further, the set temperatures of the constant temperature water tank 15 and the cold water tank 51 are also controlled by the mixing head 21.
Is controlled by the raw material temperature measurement sensors T 1 and T 2 provided in the first and second embodiments. As the mixing head 21, a known head used as a mixing head of a high-pressure urethane injection device can be used. As an example, a rod (not shown) capable of moving forward and backward is housed therein, and each raw material inlet and a return port are formed on a wall portion substantially orthogonal to the rod. An example in which the ejection port 23 is formed at the tip of the head is exemplified. In the mixing head 21, the raw materials press-fitted into the mixing head from the raw material inlets collide with each other by retreating the rod, and are discharged from the discharge port 23 at the tip. Further, the rod moves forward to block between the raw material inlets, and connects the raw material inlets and the return port with the side surface of the rod.
As a result, the mixing head 21 flows from the inlet of each raw material.
The raw materials that have entered inside flow out of the mixing head 21 from the return ports of the raw materials without collision and mixing with each other. Further, the mixing head 21 is provided with raw material temperature measuring sensors T 1 and T 2 so that their sensing parts are located near the respective raw material passages in the mixing head 21. The raw material temperature measurement sensors T 1 , T
2 is connected to the raw material tank temperature regulating solenoid valves B 1 , B 2 and the heat exchanger solenoid valves B 3 , B 4 described below via a controller (not shown), and the raw material tank is controlled according to the detected temperature value. The temperature control solenoid valves B 1 and B 2 and the heat exchanger solenoid valves B 3 and B 4 are opened and closed, and the temperature of the constant temperature water tank 15 and the cold water tank 51 is controlled. The raw material tanks 11 and 12 and the mixing head 21 are connected to outgoing pipes 31 and 32 and return pipes 41 and 4.
2 are connected. One end of each of the outward pipes 31 and 32 is connected to the raw material supply side of each of the raw material tanks 11 and 12.
The other end is connected to the raw material inflow port of the mixing head 21. The outgoing pipes 31 and 32 are provided with raw material pumps P 1 and P 2 . Reference numerals 33 and 34 denote inverter motors for the pumps P 1 and P 2 . Also, T 3 , T
4 is the outgoing piping 31, 32 from each raw material tank 11, 12.
This is a raw material temperature measurement sensor that measures the temperature of each raw material that is pressure-fed. One end of each of the return pipes 41 and 42 is connected to the raw material return side of each of the raw material tanks 11 and 12, and the other end is connected to the raw material return port of the mixing head 21. Middle of the return pipe 41, through the auxiliary raw material feed pump P 5, the auxiliary circulation pipe 43 provided with a P 6 is connected to the supply side of the raw material tank 11, 12. In addition, in the return pipes 41 and 42,
Connecting portions 45 and 46 to the raw material tanks 11 and 1
Heat exchangers 47 and 48 are provided between the two return sides. The heat exchangers 47 and 48 are connected to a common cold water tank 51 via heat exchanger solenoid valves B 3 and B 4 and a pump P 4 . The heat exchanger solenoid valves B 3 and B 4 are connected to the raw material temperature measuring sensors T 1 and T 2 of the mixing head 21 via the control device as described above. Note that T
5, T 6 is a sensor for measuring the temperature of each raw material back to the raw material tank. When the high-pressure urethane injection device thus configured is operated, it is first set to a non-discharge circulation state. At this time, the rod in the mixing head 21 moves forward, and each raw material inlet port and each raw material return port of the mixing head 21 are in a state of communicating with each other on the side surface of the rod. In this state, each raw material at a predetermined temperature is pumped from the raw material tanks 11 and 12 to the outgoing pipes 31 and 32 by the raw material pumps P 1 and P 2 , and is also circulated by the auxiliary raw material pumps P 5 and P 6 . To the supply pipes 43 and 44. At this time, the outbound piping 31,
The flow rate ratio between the polyol-side raw material and the isocyanate-side raw material that is pumped to 32 is made equal to the mixing ratio at the time of discharge determined according to the composition of each raw material.
34, it is made smaller than at the time of ejection. On the other hand, the flow rates of the polyol-side raw material and the isocyanate-side raw material that are pressure-fed to the auxiliary circulation pipes 43 and 44 are determined in consideration of efficient heat exchange by the heat exchanger. The raw materials fed to the outgoing pipes 31 and 32 flow into the mixing head 21 from the raw material inflow port of the mixing head 21 and flow out of the mixing head 21 from the raw material return port without being mixed with each other to return to the home. Piping 4
1,42. On the other hand, the raw materials pressure-fed to the auxiliary circulation pipes 43 and 44 reach the return pipes 41 and 42 and merge with the raw materials returned through the mixing head 21, respectively. Return pipe 41,
42 is pumped. The combined raw materials pass through the heat exchangers 47 and 48 on the way, are cooled to a predetermined temperature, return to the raw material tanks 11 and 12, and thereafter the circulation is repeated. At this time, the combined raw materials are supplied to the heat exchangers 47 and 48.
Therefore, the flow rate is sufficient for heat exchange, and each raw material is efficiently cooled. During the non-discharge circulation, the temperature of each raw material passing through the mixing head 21 is constantly measured by the raw material temperature measuring sensors T 1 and T 2 provided in the mixing head 21. Then, according to the difference between the measured temperature and the preset mixing / discharging temperature of the raw material, the raw material tank temperature regulating solenoid valves B 1 and B 2 and the heat exchanger solenoid valves B 3 and B 4 are opened and closed to perform mixing. The temperature of each raw material passing through the head 21 is set to the set mixed discharge temperature. Note that a comparison between the measured temperature and a set temperature,
The opening / closing command of the raw material tank temperature regulating solenoid valves B 1 and B 2 and the heat exchanger solenoid valves B 3 and B 4 may be performed by the above-mentioned controller, or the raw material temperature measuring sensor T may be provided without providing the controller. The operator may open and close the solenoid valves B 1 ,... According to the measured values of T 1 and T 2 . Next, mixed discharge of the raw materials is performed. The mixing and discharging are performed by increasing the pressures of the raw material pumps P 1 and P 2 by the inverter motors 33 and 34 and retreating the rods in the mixing head 21. As a result, the raw material inlets of the mixing head 21 directly oppose each other, and the high-pressure raw materials pumped into the mixing head 21 from the raw material inlets of the mixing head 21 through the outgoing pipes 31 and 32 collide and mix with each other. It is discharged from the discharge port 23 of the mixing head 21. During this time, each raw material circulates through the auxiliary circulation pipes 43 and 44. The temperature of each raw material in the mixing head 21 is measured by the raw material temperature measuring sensors T 1 and T 2 , and the temperature of each raw material is adjusted according to the measured temperature. After the end of the discharge, the non-discharge circulation state is set again to prepare for the next discharge. As shown and described above, according to the present invention, since each raw material always passes through the mixing head, each raw material at the position immediately before mixing and discharging is determined by the raw material temperature measuring sensor provided in the mixing head. The temperature of the raw material can be measured. Therefore, if the temperature of each raw material is adjusted based on the measured temperature, the temperature of each raw material at the position immediately before mixing can be extremely easily adjusted to an appropriate value. Further, since each raw material circulating through the mixing head and each raw material circulating through the auxiliary circulation pipe are merged and then passed through the heat exchanger, the flow rate of each raw material passing through the heat exchanger is: The amount required is sufficient for efficient heat exchange, and the raw material temperature is controlled efficiently. Further, since the high / low pressure switching valve is not required, there is no problem due to the malfunction of the high / low pressure switching valve.
【図面の簡単な説明】
【図１】この発明の一実施例を示す高圧ウレタン注入装
置の構造を示す図である。
【図２】従来の高圧ウレタン注入装置の構造を示す図で
ある。
【符号の説明】
１１，１２ 原料タンク
２１ ミキシングヘッド
３１，３２ 往路配管
４１，４２ 復路配管
４３，４４ 補助循環用配管
４７，４８ 熱交換器
Ｔ1 ，Ｔ2 原料温度測定センサーBRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a structure of a high-pressure urethane injection device showing one embodiment of the present invention. FIG. 2 is a view showing the structure of a conventional high-pressure urethane injection device. [Description of Reference Numerals] 11, 12 raw material tank 21 a mixing head 31 and 32 outbound pipeline 41 return pipe 43 auxiliary circulation pipe 47, 48 heat exchanger T 1, T 2 material temperature measurement sensor
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｂ２９Ｃ 45/78 Ｂ２９Ｃ 45/78 (56)参考文献 特開 平６−210150（ＪＰ，Ａ) 特開 平７−26056（ＪＰ，Ａ) 特開 平４−269510（ＪＰ，Ａ) 特開 平６−99452（ＪＰ，Ａ) 特開 平３−161078（ＪＰ，Ａ) 特開 平２−293062（ＪＰ，Ａ) 特開 平１−191212（ＪＰ，Ａ) 特開 昭59−212236（ＪＰ，Ａ) 実開 昭56−104909（ＪＰ，Ｕ) 実開 昭59−86236（ＪＰ，Ｕ) 実開 昭62−3709（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) B29B 7/00 - 7/94 B01F 5/00 - 5/26 B05B 7/00 - 9/08 B29C 39/00 - 39/44 B29C 45/00 - 45/84 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI B29C 45/78 B29C 45/78 (56) References JP-A-6-210150 (JP, A) JP-A-7-26056 (JP) JP-A-4-269510 (JP, A) JP-A-6-99452 (JP, A) JP-A-3-161078 (JP, A) JP-A-2-2933062 (JP, A) JP-A-59-212236 (JP, A) JP-A-56-104909 (JP, U) JP-A-59-86236 (JP, U) JP-A-62-3709 (JP, A) U) (58) Fields investigated (Int.Cl. 7 , DB name) B29B 7 /00-7/94 B01F 5/00-5/26 B05B 7 /00-9/08 B29C 39/00-39/44 B29C 45/00-45/84
Claims (1)
ート側原料タンクから圧送される各原料を、非吐出時に
は混合することなく前記各原料タンクに戻して循環さ
せ、他方吐出時には原料温度測定センサーを設けたミキ
シングヘッドで混合して吐出させる高圧ウレタン注入装
置において、 前記吐出時及び非吐出循環時に各原料タンクからミキシ
ングヘッドへ各原料を圧送する往路配管と、前記非吐出
循環時にミキシングヘッドから各原料タンクへ各原料を
戻す復路配管とにより、前記各原料タンクをミキシング
ヘッドに連結する一方、前記各原料タンクから復路配管
へ各原料を圧送する補助循環用配管により、前記各原料
タンクの原料供給側を復路配管途中に連結し、前記復路
配管における補助循環用配管との連結部と各原料タンク
間には熱交換器を設けたことを特徴とする高圧ウレタン
注入装置。(57) Claims 1. Each raw material fed from a polyol-side raw material tank and an isocyanate-side raw material tank is returned to the respective raw material tanks without being mixed when not discharged, and circulated. In a high-pressure urethane injecting apparatus that sometimes mixes and discharges by a mixing head provided with a raw material temperature measuring sensor, a forward pipe for pressure-feeding each raw material from each raw material tank to the mixing head during the discharge and non-discharge circulation, and a non-discharge circulation At the same time, each of the raw material tanks is connected to the mixing head by a return pipe that returns each raw material from the mixing head to each raw material tank, while the auxiliary circulation pipe that feeds each raw material from each of the raw material tanks to the return pipe is The raw material supply side of the raw material tank is connected in the middle of the return pipe, and a connection portion with the auxiliary circulation pipe in the return pipe is provided. A high-pressure urethane injection device, wherein a heat exchanger is provided between each of the raw material tanks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28578293A JP3379800B2 (en) | 1993-10-20 | 1993-10-20 | High pressure urethane injection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28578293A JP3379800B2 (en) | 1993-10-20 | 1993-10-20 | High pressure urethane injection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07117045A JPH07117045A (en) | 1995-05-09 |
| JP3379800B2 true JP3379800B2 (en) | 2003-02-24 |
Family
ID=17696002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28578293A Expired - Fee Related JP3379800B2 (en) | 1993-10-20 | 1993-10-20 | High pressure urethane injection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3379800B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000102944A (en) * | 1998-09-29 | 2000-04-11 | Nippon Zeon Co Ltd | Method and apparatus for reactive polymerization molding |
| EP1408063A4 (en) * | 2001-05-24 | 2004-11-17 | Mitsui Takeda Chemicals Inc | Process for producing flexible polyurethane foams and apparatus for producing flexible polyurethane foams |
| JP5039897B2 (en) * | 2007-11-09 | 2012-10-03 | 東洋ゴム工業株式会社 | Polyurethane foam stock solution component supply equipment |
| JP7181247B2 (en) * | 2020-04-11 | 2022-11-30 | 株式会社日本アクア | Urethane foam forming system |
-
1993
- 1993-10-20 JP JP28578293A patent/JP3379800B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07117045A (en) | 1995-05-09 |
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