JPH0796234B2 - Urethane foam injection device - Google Patents
Urethane foam injection deviceInfo
- Publication number
- JPH0796234B2 JPH0796234B2 JP2192288A JP2192288A JPH0796234B2 JP H0796234 B2 JPH0796234 B2 JP H0796234B2 JP 2192288 A JP2192288 A JP 2192288A JP 2192288 A JP2192288 A JP 2192288A JP H0796234 B2 JPH0796234 B2 JP H0796234B2
- Authority
- JP
- Japan
- Prior art keywords
- injection
- flow rate
- urethane foam
- pressure
- metering pump
- 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
Landscapes
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は発泡ウレタン注入装置に係り、特に注入ヘッド
からの吐出量を一定に保持し、かつ装置の異常監視も行
なえる高精度の注入装置に関する。Description: TECHNICAL FIELD The present invention relates to a urethane foam injecting device, and more particularly to a highly accurate injecting device capable of maintaining a constant discharge amount from an injection head and monitoring the abnormality of the device. Regarding
従来の発泡ウレタン注入装置は、少なくとも２種の原液
をそれぞれ計量ポンプ及び高低圧切替弁を介して、高圧
噴射ノズルを具備した注入ヘッドで混合吐出するものが
一般的である。しかし、実際に注入された成形品が設定
値どうり注入されたか否か判断することが困難であり、
最近では注入量異常を感知するため、例えば特開昭59−
260713号公報は、上記注入ヘッドからの戻り液を圧力セ
ンサーで感知することで注入量不足品を自動的に発見で
きる装置を提案している。A conventional urethane foam injection device generally mixes and discharges at least two kinds of stock solutions through a metering pump and a high / low pressure switching valve with an injection head equipped with a high pressure injection nozzle. However, it is difficult to judge whether or not the molded product actually injected is the set value.
Recently, in order to detect an abnormal injection amount, for example, JP-A-59-
Japanese Laid-Open Patent Publication No. 260713 proposes a device that can automatically detect an insufficient injection amount product by detecting the return liquid from the injection head with a pressure sensor.
上記従来技術では、注入ヘッドの作動不良等による注入
量異常は容易に感知されるが、注入精度自体の向上につ
いては配慮がされていない。すなわち、従来の注入ヘッ
ドからの吐出精度は、装置に異常がない限り計量ポンプ
の吐出精度でほぼ決まるが、実際には配管抵抗や原液温
度及び吐出圧力等の発泡条件の変動により計量ポンプの
吐出精度より劣る。また、計量ポンプや高低圧切替弁か
らの原液洩れ等があると吐出精度はさらに低下するとい
う問題があり、通常はこのような吐出流量のバラツキを
考慮して必要量よりも３％程度余分に注入することが多
い。In the above-mentioned conventional technique, an abnormal injection amount due to defective operation of the injection head is easily detected, but no consideration is given to the improvement of the injection accuracy itself. That is, the discharge accuracy from the conventional injection head is almost determined by the discharge accuracy of the metering pump as long as there is no abnormality in the device, but actually the discharge of the metering pump is caused by fluctuations in foaming conditions such as pipe resistance, stock solution temperature and discharge pressure. Inferior to accuracy. In addition, there is a problem that if there is a leak of the raw liquid from the metering pump or the high / low pressure switching valve, the discharge accuracy will be further reduced. Often injected.
本発明の目的は上記発泡条件等の変動に関係なく注入ヘ
ッドからの吐出精度を大幅に向上させた発泡ウレタン注
入装置を提供することにある。An object of the present invention is to provide a urethane foam injecting device in which the accuracy of ejection from the injection head is greatly improved regardless of the above-mentioned changes in the foaming conditions and the like.
上記目的は、少なくとも２種の原液をそれぞれ計量ポン
プ及び高低圧切替弁を介して、高圧噴射ノズルを具備し
た注入ヘッドで混合吐出する発泡ウレタン注入装置にお
いて、上記高低圧切替弁と注入ヘッドとの間に具備した
流量感知部の出力により上記計量ポンプの吐出流量を制
御する流量制御部を設けることにより達成される。The above-mentioned object is a urethane foam injecting device that mixes and discharges at least two kinds of stock solutions with an injection head equipped with a high-pressure injection nozzle via a metering pump and a high-low pressure switching valve, respectively. This can be achieved by providing a flow rate control unit for controlling the discharge flow rate of the metering pump by the output of the flow rate sensing unit provided between them.
計量ポンプにより送られた原液は高低圧切替弁を介して
高圧循環となり、上流流量感知部で実際の吐出流量を感
知しながら注入ヘッドにより吐出される。ここで感知し
た吐出流量が設定値をはずれて変動した場合、上記流量
制御部により瞬時に上記計量ポンプの吐出流量を自動変
換し、注入ヘッドからの吐出流量を常に設定値どうり一
定に保持するものである。The undiluted solution sent by the metering pump becomes high pressure circulation through the high / low pressure switching valve, and is discharged by the injection head while sensing the actual discharge flow rate by the upstream flow rate sensing unit. When the discharge flow rate sensed here fluctuates outside the set value, the flow rate control unit instantly automatically converts the discharge flow rate of the metering pump to keep the discharge flow rate from the injection head constant at the set value. It is a thing.
以下、本発明の一実施例を第１図により説明する。第１
図は本発明の流量制御部を備えた発泡ウレタン注入装置
のブロック図である。なお、２種の原液（ポリオール側
とイソシアネート側）を混合する装置の内、一方の原液
側循環経路は省略した。また、図中の矢印は原液及び信
号の流れを示す。An embodiment of the present invention will be described below with reference to FIG. First
The figure is a block diagram of a urethane foam injecting apparatus provided with a flow rate control unit of the present invention. In the apparatus for mixing two types of stock solutions (polyol side and isocyanate side), one stock solution side circulation path was omitted. The arrows in the figure show the flow of the stock solution and the signal.
図において、１は原液タンクであり、計量ポンプ２より
送り込まれた原液は高低圧切替弁５を介して高圧循環と
なり、流量センサ６（流量感知部）を通過した後、高圧
噴射ノズル7aの開閉により（開閉は油圧装置で行なう…
図示せず）注入ヘッド７で２種の原液が100kgf/cm2前後
の高圧で攪拌混合され製品11に注入される。なお、循環
時は絞り弁９で注入時とほぼ同じ圧力に調整しておくと
注入が安定し好ましい。さらに装置の故障等で圧力が異
常に変動した場合は、低圧カット３又は高圧カット４に
より自動的に注入装置を停止させる構成になっている。
また、注入量は成形する製品11及び発泡治具12の温度
（通常は30℃〜45℃に予熱して注入する）により異なる
が、本実施例では、壁温センサ10で注入直前の製品11及
び発泡治具12の予熱温度を検知し、制御部13内に組み込
まれたシーケンサ13aにより適正注入量（注入タイム）
を算出して注入ON−OFF、すなわち高圧噴射ノズル7aの
開閉を自動的に制御するものである。In the figure, 1 is a stock solution tank, and the stock solution sent from the metering pump 2 becomes a high pressure circulation through a high / low pressure switching valve 5, passes through a flow rate sensor 6 (flow rate sensing unit), and then opens / closes a high pressure injection nozzle 7a. By (opening and closing is done with a hydraulic device ...
(Not shown) The two kinds of stock solutions are stirred and mixed at a high pressure of about 100 kgf / cm 2 by the injection head 7 and injected into the product 11. During circulation, it is preferable that the throttle valve 9 adjusts the pressure to approximately the same as during injection, because the injection is stable. Further, if the pressure fluctuates abnormally due to a device failure or the like, the injection device is automatically stopped by the low pressure cut 3 or the high pressure cut 4.
Further, the injection amount differs depending on the temperature of the product 11 to be molded and the temperature of the foaming jig 12 (usually preheated to 30 ° C. to 45 ° C. for injection), but in the present embodiment, the product 11 immediately before the injection is performed by the wall temperature sensor 10. And the preheating temperature of the foaming jig 12 is detected, and the proper injection amount (injection time) is set by the sequencer 13a incorporated in the control unit 13.
Is calculated and injection ON-OFF, that is, the opening / closing of the high-pressure injection nozzle 7a is automatically controlled.
一方、本発明では上記流量センサ６の出力を制御部13に
送り、高圧循環時及び注入時の実際の吐出流量を計測
し、シーケンサ13aにより0.5秒ごとに誤差演算を行な
い、流量設定値に対する誤差分をその都度流量変換する
ものである。流量変換はシーケンサ13aからの信号によ
り、流量変換装置13b（インバータ）で計量ポンプ２を
運転するモータ2aの回転数を制御することにより行な
う。On the other hand, in the present invention, the output of the flow rate sensor 6 is sent to the control unit 13 to measure the actual discharge flow rate during high-pressure circulation and injection, and the sequencer 13a performs an error calculation every 0.5 seconds to obtain an error for the flow rate setting value. The flow rate is converted every minute. The flow rate conversion is performed by controlling the number of rotations of the motor 2a that operates the metering pump 2 with the flow rate conversion device 13b (inverter) according to the signal from the sequencer 13a.
なお、上記流量センサ６は日東精工製RHP2型流量計等が
好ましく、高低圧力切替弁５と注入ヘッド７との間に、
好ましくは注入ヘッド７の直前に配設するのが良い。The flow sensor 6 is preferably a RHP2 type flow meter manufactured by Nitto Seiko, etc., and between the high / low pressure switching valve 5 and the injection head 7,
It is preferably arranged immediately before the injection head 7.
さらに、注入ヘッド７からの戻り配管に圧力センサ８を
配設した。循環時の戻り配管内圧力は絞り弁９により10
0kgf/cm2前後に調整されているが、注入時では原液の流
れが止まり圧力はほぼ０に近くなる。したがって、この
圧力変化を上記圧力センサ８で感知することにより、高
圧噴射ノズルの実際の開閉時間注入時間及び注入時に戻
り液がないかを監視し、異常の場間は、注入量不良品と
判断しその信号が制御部13に送られ自動的に注入装置を
停止させるものである。Further, a pressure sensor 8 is arranged in the return pipe from the injection head 7. The pressure in the return pipe during circulation is adjusted to 10 by the throttle valve 9.
The pressure is adjusted to around 0 kgf / cm 2 , but at the time of injection, the flow of the stock solution stops and the pressure becomes almost zero. Therefore, by detecting this pressure change with the pressure sensor 8, the actual opening / closing time of the high-pressure injection nozzle and the injection time and whether there is any return liquid during the injection are monitored. The signal is sent to the control unit 13 to automatically stop the injection device.
本実施例によれば製品や発泡治具の予熱温度に対応した
最適注入量に制御することができ、かつ注入時の吐出流
量を常に設定値どうり一定に保持することができるので
注入精度が大幅に向上し、注入量の無駄がなくなると共
に成形した製品の品質向上に効果がある。また、圧力セ
ンサで注入異常を監視することで実際に注入された製品
が設定値どうり注入されたか否かを感知することができ
るので、注入不良品を自動的に発見できる効果がある。According to this embodiment, it is possible to control the optimum injection amount corresponding to the preheating temperature of the product or the foaming jig, and it is possible to always maintain the discharge flow rate at the time of injection at a set value. It is greatly improved, the injection amount is not wasted, and the quality of the molded product is improved. Further, by monitoring the injection abnormality with the pressure sensor, it is possible to detect whether or not the actually injected product is injected according to the set value, so that an injection defective product can be automatically detected.
本発明によれば、配管低抗や原液温度及び吐出圧力等の
発泡条件の変動に関係なく注入ヘッドからの吐出流量は
常に設定置どうり一定となるので、大幅に吐出精度を向
上できる。また、従来吐出流量のバラツキを考慮し必要
量よりも３％程度余分に注入していたものが、その必要
がなくなり約３％注入量を削減できると共に、信頼性を
大幅に改善できる効果がある。According to the present invention, the discharge flow rate from the injection head is always set and constant regardless of the fluctuation of the foaming conditions such as the pipe resistance and the stock solution temperature and the discharge pressure, so that the discharge accuracy can be greatly improved. Further, although the conventional injection amount is about 3% more than the required amount in consideration of the variation in the discharge flow rate, it is not necessary, and the injection amount can be reduced by about 3%, and the reliability can be greatly improved. .
第１図は本発明の流量制御部を備えた発泡ウレタン注入
装置のブロック図である。 １……原液タンク、２……計量ポンプ、2a……モータ
ー、３……低圧カット、４……高圧カット、５……高低
圧力切替弁、６……流量センサ、７……注入ヘッド、7a
……高圧噴射ノズル、８……圧力センサ、９……絞り
弁、10……壁温センサ、11……製品、12……発泡治具、
13……制御部、13a……シーケンサ、13b……流量変換装
置。FIG. 1 is a block diagram of a urethane foam injecting device provided with a flow rate control unit of the present invention. 1 ... undiluted solution tank, 2 ... metering pump, 2a ... motor, 3 ... low pressure cut, 4 ... high pressure cut, 5 ... high / low pressure switching valve, 6 ... flow sensor, 7 ... injection head, 7a
...... High-pressure injection nozzle, 8 ...... Pressure sensor, 9 ...... Throttle valve, 10 ...... Wall temperature sensor, 11 ...... Product, 12 ...... Foaming jig,
13 ... Control unit, 13a ... Sequencer, 13b ... Flow rate converter.
Claims (1)
プ及び高低圧切替弁を介して、高圧噴射ノズルを具備し
た注入ヘッドで混合吐出する発泡ウレタン注入装置にお
いて、上記高低圧切替弁と注入ヘッドとの間に具備した
流量感知部の出力により上記計量ポンプの吐出流量を制
御する流量制御部を設けたことを特徴とする発泡ウレタ
ン注入装置。1. A urethane foam injecting device for mixing and discharging at least two kinds of stock solutions with an injection head equipped with a high-pressure injection nozzle via a metering pump and a high-low pressure switching valve, respectively. An apparatus for injecting urethane foam, comprising a flow rate control section for controlling the discharge flow rate of the metering pump according to the output of a flow rate sensing section provided between the two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2192288A JPH0796234B2 (en) | 1988-02-03 | 1988-02-03 | Urethane foam injection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2192288A JPH0796234B2 (en) | 1988-02-03 | 1988-02-03 | Urethane foam injection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01198313A JPH01198313A (en) | 1989-08-09 |
| JPH0796234B2 true JPH0796234B2 (en) | 1995-10-18 |
Family
ID=12068564
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2192288A Expired - Fee Related JPH0796234B2 (en) | 1988-02-03 | 1988-02-03 | Urethane foam injection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0796234B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5523330A (en) * | 1994-07-21 | 1996-06-04 | Woodbridge Foam Corporation | Process for producing a foamed isocyanate-based polymer |
| KR20000070441A (en) | 1997-01-23 | 2000-11-25 | 선스타 기켄 가부시키가이샤 | Two-pack urethane foam composition, and two-pack urethane foam composition packing apparatus and method |
| DE102010043329A1 (en) * | 2010-11-03 | 2012-05-03 | Bayer Materialscience Aktiengesellschaft | Process for the production of foamed moldings |
| CN116176008B (en) * | 2023-04-25 | 2023-08-22 | 北京维盛复合材料有限公司 | Raw material process flow control system |
-
1988
- 1988-02-03 JP JP2192288A patent/JPH0796234B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01198313A (en) | 1989-08-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |