JPH04209016A - Flow rate control system - Google Patents
Flow rate control systemInfo
- Publication number
- JPH04209016A JPH04209016A JP34124290A JP34124290A JPH04209016A JP H04209016 A JPH04209016 A JP H04209016A JP 34124290 A JP34124290 A JP 34124290A JP 34124290 A JP34124290 A JP 34124290A JP H04209016 A JPH04209016 A JP H04209016A
- Authority
- JP
- Japan
- Prior art keywords
- flow rate
- mass flow
- control valve
- signal
- paint
- 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.)
- Pending
Links
- 239000012530 fluid Substances 0.000 claims description 20
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 230000011664 signaling Effects 0.000 claims description 2
- 239000003973 paint Substances 0.000 abstract description 42
- 239000011248 coating agent Substances 0.000 abstract description 5
- 238000000576 coating method Methods 0.000 abstract description 5
- 238000005507 spraying Methods 0.000 abstract description 3
- 230000005284 excitation Effects 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 238000010422 painting Methods 0.000 description 22
- 238000010586 diagram Methods 0.000 description 11
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Landscapes
- Feedback Control In General (AREA)
- Flow Control (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Spray Control Apparatus (AREA)
- Coating Apparatus (AREA)
Abstract
Description
【発明の詳細な説明】
垣１分立
本発明は、間歇的に流体を噴射する装置において流体の
質量流量を高速で計測制御する流量コントローラに関し
、より詳細には自動車の本体の塗装において均一な被膜
を塗料の無駄がなく、しかも高速に行う塗装ライン用の
流量コントローラに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flow rate controller that measures and controls the mass flow rate of a fluid at high speed in a device that intermittently injects fluid, and more specifically relates to a flow rate controller that measures and controls the mass flow rate of a fluid at high speed in a device that injects fluid intermittently. This relates to a flow rate controller for a painting line that does not waste paint and does so at high speed.
ｌ米致■
自動車の車体の塗装の良否は、車体の耐蝕上に影響する
だけでなく、美観上も重要であり、塗料の被膜が塗装面
に亘って均一で平滑な仕１ユげが行われることが求めら
れる。しかも、これらの作業において無駄なく有効な噴
射がなされることが条件とされる。■ The quality of the paint on the car body not only affects the corrosion resistance of the car body, but is also important for aesthetics. It is required to be understood. Moreover, it is a condition that effective injection be performed without waste in these operations.
第５図は、自動車の車体塗装の概要を説明する図であり
、図中、４０は車体、４１は塗料噴射の軌跡を示す。車
体４０はＸ軸上に間歇的に移動し、塗装用のノズル（図
示せず）は車体４０に対し塗料噴射の軌跡４１に示すよ
うな移動を伴って塗料の噴射が行われる。即ち、ノズル
は、車体４０が停止時には矢印■方向に移動しながら塗
装し、ｙ、に達した時点で塗装を停止し車体を△Ｘ移動
し、移動が完了したら矢印に従った逆方向に再び塗装を
開示し、図示の矢印の如く上記の塗装、車体の移動を繰
返し、所定面の塗装を完了する。しかしながら、ノズル
の移動速度が一定であるから塗装が車体面に均一になさ
れるためには、ノズルから噴射される塗料質量流量を一
定にしなければならない。しかし、ノズルの開口は一定
であるから塗料の体積流量は粘度、密度が影響する。塗
料の粘度、密度は気温の上昇に従って低下し、気温の低
下により増加する。このため塗装に当っては適宜実流量
のチエツクがなされ、これに基づいてノズルが選ばれる
。FIG. 5 is a diagram illustrating the outline of car body painting. In the figure, 40 shows the car body, and 41 shows the locus of paint injection. The vehicle body 40 moves intermittently on the X-axis, and a paint nozzle (not shown) moves toward the vehicle body 40 as shown in a paint spray trajectory 41 to spray paint. That is, when the car body 40 is stopped, the nozzle paints while moving in the direction of the arrow ■, and when it reaches y, it stops painting and moves the car body △X, and when the movement is completed, it moves again in the opposite direction according to the arrow. Painting is started, and the above painting and movement of the vehicle body are repeated as shown by the arrows in the figure to complete the painting of the predetermined surface. However, since the moving speed of the nozzle is constant, the mass flow rate of the paint injected from the nozzle must be constant in order to uniformly paint the surface of the vehicle body. However, since the opening of the nozzle is constant, the volumetric flow rate of the paint is affected by the viscosity and density. The viscosity and density of paint decrease as the temperature rises, and increase as the temperature decreases. For this reason, when painting, the actual flow rate is checked as appropriate, and the nozzle is selected based on this.
第６図は、従来の塗装ノズルの構成を示す図で、図中、
４１，４２，４３．４４は配管、４５゜４６．４７はノ
ズル、４８，４９，４９ａ、４９ｂ、４９ｃは弁、５０
は容器、５１は分岐管である。図示においてノズル４５
，４６．４７の流量割合は例えば各々ｌ、９．］の比に
区分されている。塗装に当っては、準備操作としてまず
弁４９は閉、弁４８は開の状態で配管４１から定圧で供
給された塗料は分岐管５Ｉを通って所定時間容器５０に
注入し、この間容器５０内に収容された塗料の体積量か
ら流量を算出する。算出された流量は、この時点におけ
る粘度、密度により定められる試験流量であり、この流
量に基づいて予め現定された表に従って弁４９ ａ、
４９ ｂ、 ４９ ｃを開閉しノズル４５，４６．４７
を選択し組合せて流量割合９，１０．ＩＩの塗料を噴射
する。すなわち±１０％の流量範囲の選択がなされる。FIG. 6 is a diagram showing the configuration of a conventional painting nozzle.
41, 42, 43.44 are pipes, 45° 46.47 are nozzles, 48, 49, 49a, 49b, 49c are valves, 50
is a container, and 51 is a branch pipe. In the illustration, nozzle 45
, 46.47 are, for example, l, 9., respectively. ] are divided into ratios. For painting, first, as a preparatory operation, the valve 49 is closed, the valve 48 is opened, and the paint supplied from the pipe 41 at a constant pressure is injected into the container 50 for a predetermined period of time through the branch pipe 5I. The flow rate is calculated from the volume of paint contained in the container. The calculated flow rate is a test flow rate determined by the viscosity and density at this point, and the valve 49 a,
49 b, 49 c open and close nozzles 45, 46, 47
Select and combine the flow rate ratios 9, 10. Spray paint II. That is, a flow rate range of ±10% is selected.
斜上の如く、従来の塗装ノズルを用いて塗装する方法は
、塗装前に測定された塗料の体積流量に基づいて単にノ
ズルを選択するだけで、実際の塗装においては計量する
ことはなく、噴射量は低精度であり操作も煩雑であるこ
とから質量流量計で直接質量流量を計測して塗装するこ
とが試みられる。As shown in the above example, the conventional method of painting using paint nozzles simply selects the nozzle based on the volumetric flow rate of the paint measured before painting, and there is no metering during actual painting. Since the amount has low accuracy and the operation is complicated, attempts have been made to directly measure the mass flow rate with a mass flow meter and apply the coating.
一佳一一一飾一
本発明は、斜上の問題点に鑑みなされたもので、塗料を
質量流量計により計測し、計測した質量流量信号と予め
設定された所定の質量流量に対応する設定信号とを比較
し制御弁を制御し塗料を所定の質量流量で噴射し塗装す
ることにより塗料の温度による体積流量の変化を考慮す
ることなしに一定の膜厚の塗装を行い高品位の塗装を簡
易に行なうことを可能とする流量コントロールシステム
を提供することを目的とする。The present invention was made in view of the problem of slanting. The present invention is made by measuring the paint with a mass flow meter, and setting the measured mass flow rate signal and a predetermined mass flow rate. By comparing the signal with the control valve and spraying the paint at a predetermined mass flow rate, a constant coating thickness is achieved without considering changes in the volumetric flow rate due to paint temperature, resulting in high-quality painting. The purpose of the present invention is to provide a flow rate control system that can be easily controlled.
■−−炭
本発明は、上記目的を達成するために、（１）流体源に
連通ずる質量流量計、制御弁、弁手段および前記流体源
から給液される流体を噴射するノズルを直列接続した流
路において、前記流体を、所定時間毎の期間に噴射し５
噴射する流体の質量流量を所定の質量流量設定値に制御
する制御弁の制御手段を具備したこと、更には、（２）
前記流量コントロールシステムにおいて、流体噴射期間
の立上りにおいて質量流量設定信号に略々等しい信号を
発信する信号手段により制御弁を開弁じ、質量流量が設
定値近傍に達する時期に、予め設定した前記質量流量設
定信号と質量流量計信号とを比較し質量流量が設定値と
なるように制御弁を制御駆動すること、更には、（３）
前記期間において制御弁を制御駆動し、質量流量が設定
値に達したとき、制御を解き記憶した設定信号により制
御弁を駆動することを特徴とするものである。以下、本
発明の実施例に基づいて説明する。(1) A mass flow meter, a control valve, a valve means, and a nozzle for injecting fluid supplied from the fluid source are connected in series to achieve the above object. The fluid is injected at predetermined time intervals in the flow path.
(2) further comprising a control valve control means for controlling the mass flow rate of the fluid to be injected to a predetermined mass flow rate setting value;
In the flow rate control system, the control valve is opened by a signal means that transmits a signal substantially equal to the mass flow rate setting signal at the rise of a fluid injection period, and the preset mass flow rate is controlled at a time when the mass flow rate reaches a vicinity of the set value. (3) Comparing the setting signal and the mass flowmeter signal and controlling and driving the control valve so that the mass flow rate becomes the set value;
The control valve is controlled and driven during the period, and when the mass flow rate reaches a set value, the control is released and the control valve is driven according to the stored setting signal. Hereinafter, the present invention will be explained based on examples.
第１図は、本発明の流量コントロールシステムの構成を
しめずブロック図で、図中、１はタンク、２は塗料、３
は質量流量計（Ｍ−Ｍ）、４は制御弁、５はノズル、６
はポンプ、７，８は電磁弁、９は配管、１０は制御手段
、１１は流量設定部（Ｑ−８ＥＴ）、１２は流量制御部
（Ｆ’ＩＣ）、１３はＡ／Ｄ （アナログ／デジタル）
変換器である。質量流量計Ｉ３はコリオリの力を利用し
た流量計で、Ｕ字導管を支持点を結んだ軸まわりに定振
幅で加振した場合、前記Ｕ字管対称軸まわりに質量流量
に比例したコリオリの力によるトルクが発生し、該コリ
オリの力をＵ字導管の捩れ変位として検知する質量流量
計であり、加振周波数が高いので極めて応答が速く質量
流量をアナログ信号として出力する。流量制御部１２は
流量設定部１１により質量流量に応じた基準信号を設定
し、該設定信号と前記質量流量信号とを比較し、質量量
流量が設定値になるようにＡ／Ｄ変換器１３によりデジ
タル変換し、制御弁１４をデジタル信号により開閉制御
するとともに塗装プログラムに従って流路を開閉する。FIG. 1 is a block diagram showing the configuration of the flow control system of the present invention, in which 1 is a tank, 2 is a paint, 3 is a
is a mass flow meter (M-M), 4 is a control valve, 5 is a nozzle, 6
is a pump, 7 and 8 are electromagnetic valves, 9 is a pipe, 10 is a control means, 11 is a flow rate setting section (Q-8ET), 12 is a flow rate control section (F'IC), 13 is an A/D (analog/digital )
It is a converter. The mass flowmeter I3 is a flowmeter that uses the Coriolis force, and when a U-shaped conduit is vibrated with constant amplitude around the axis connecting the supporting points, a Coriolis force proportional to the mass flow rate is generated around the symmetrical axis of the U-shaped tube. This is a mass flow meter that generates torque due to force and detects the Coriolis force as a torsional displacement of a U-shaped conduit.Since the excitation frequency is high, the response is extremely fast and the mass flow rate is output as an analog signal. The flow rate control unit 12 sets a reference signal according to the mass flow rate by the flow rate setting unit 11, compares the setting signal with the mass flow rate signal, and controls the A/D converter 13 so that the mass flow rate becomes the set value. The control valve 14 is controlled to open and close using the digital signal, and the flow path is opened and closed according to the coating program.
すなわち、タンクｌ内の塗料２はポンプ１６により定圧
輸液され、更に圧力制御弁（図示せず）により高精度な
一定圧力のもとて配管１９内に充たされる。流量制御部
１２の指令により電磁弁１７．１８が開路することによ
りノズル１５より前記の如く設定値に制御された質量流
量の塗料が噴射される。この場合、塗装プログラムにお
ける塗装指令は設定された質量流量により塗装を開始し
所定時間後に停止する０Ｎ−ＯＦＦ信号である。That is, the paint 2 in the tank 1 is infused at a constant pressure by the pump 16, and is further filled into the pipe 19 under a highly accurate constant pressure by a pressure control valve (not shown). When the electromagnetic valves 17 and 18 are opened in response to a command from the flow rate controller 12, the nozzle 15 injects paint at a mass flow rate controlled to the set value as described above. In this case, the painting command in the painting program is an ON-OFF signal that starts painting at a set mass flow rate and stops after a predetermined time.
第２図は、ω料の質量流量の流量パターンを表すグラフ
で、横軸に時間、縦軸に質量流量をとっである。グラフ
の質量流量はＱ、に設定してあり、時間軸の０点で塗装
開始指令が発信された場合のもので制御はＰＩＤ（比例
・積分・微分制御）が適用される。図示のグラフは振動
を実際以上に大きくして示しているが、比例・微分ゲイ
ンをあげると応答が速くし振動を抑制し設定質量流量Ｑ
。FIG. 2 is a graph showing the flow rate pattern of the mass flow rate of the ω material, with time on the horizontal axis and mass flow rate on the vertical axis. The mass flow rate in the graph is set to Q, and this is when a coating start command is issued at the 0 point on the time axis, and PID (proportional integral differential control) is applied to the control. The graph shown shows vibration larger than it actually is, but increasing the proportional/derivative gain will speed up the response and suppress vibration, allowing the set mass flow rate Q
.
に達するのに時間をできるだけ速くなるように調整する
。この間の塗料は被膜厚さに影響を及ぼすので短時間（
例えば３秒）で定質量流量に達することが要求される。Adjust the time to reach as fast as possible. During this time, the paint will affect the film thickness, so it will take a short time (
eg 3 seconds) to reach a constant mass flow rate.
より短時間で定質量流量に達するようにするためには、
塗料期間の立上り時期をオープンループで開弁じ質量流
量が所定値に達した時点で制御を行うことである。To reach a constant mass flow rate in a shorter time,
The start-up timing of the paint period is controlled in an open loop when the valve is opened and the mass flow rate reaches a predetermined value.
第３図は、本発明の流量コントロールシステムの他の実
施例の構成を示すブロック図で、図中、２１は容器、２
２は塗料、２３は質量流量計、２３ａは変換器、２４は
制御弁、２５はノズル、２６はポンプ、２７．２８は電
磁弁、２９は配管、３０は制御手段、３１は流量設定部
（Ｑ−３ＥＴ）、３２は制御部（ＦＩＧ）、３３はアナ
ログメモリ部（Ａ −ＭＥＭＯ）、３４はバルブ設定部
（Ｖ−５ＥＴ）、３５は第一切替スイッチ、３６は第二
切替スイッチである。図示の流量コントロールシステム
は、容器２１内に塗料を収容し、ポンプ２６で輸液する
流体源と、質量流量計２３、制御弁２４およびノズル２
５とを配管２９に直列に接続した流路と、流量設定部３
１に塗装時にノズル２５より噴射される塗料質量流量の
目標値を設定して、塗料を設定値となるよう制御する制
御手段３０とからなっている。FIG. 3 is a block diagram showing the configuration of another embodiment of the flow rate control system of the present invention, in which 21 is a container;
2 is paint, 23 is a mass flow meter, 23a is a converter, 24 is a control valve, 25 is a nozzle, 26 is a pump, 27.28 is a solenoid valve, 29 is piping, 30 is a control means, 31 is a flow rate setting part ( Q-3ET), 32 is a control unit (FIG), 33 is an analog memory unit (A-MEMO), 34 is a valve setting unit (V-5ET), 35 is a first changeover switch, and 36 is a second changeover switch. . The illustrated flow control system includes a fluid source containing paint in a container 21 and injected by a pump 26, a mass flow meter 23, a control valve 24, and a nozzle 2.
5 connected in series to the piping 29, and the flow rate setting section 3.
1, a control means 30 sets a target value for the mass flow rate of the paint to be injected from the nozzle 25 during painting, and controls the paint so that the paint reaches the set value.
以下、図示に基づいて本発明の他の実施例の流量コント
ロールシステムの動作を下記フローパターンとともに説
明する。Hereinafter, the operation of a flow rate control system according to another embodiment of the present invention will be explained based on the drawings together with the following flow pattern.
第４図は、本発明の質量流量のパターンを示す図で、横
軸は時間、縦軸は質量流量をとっている。FIG. 4 is a diagram showing the mass flow rate pattern of the present invention, where the horizontal axis represents time and the vertical axis represents mass flow rate.
まず、質量流量計２３は、コリオリの力を利用したもの
で、Ｕ字形導管を支持軸まわりに定振幅で加振した場合
、Ｕ字導管には対称軸に関し、質量流量に比例したコリ
オリの力によるモーメントが発生してねじれ変位をとも
ない、このねじれ変位に比例したアナログ信号を変換器
２３ａより出力する。−力制御弁４は電流、電圧等のア
ナログ信号が印加されると弁体が上昇して開弁し流量係
数（Ｃｖ値）を変化させる。従って制御弁２４は上下流
間の差圧が一定であれば信号の印加により、該信号の関
数としての流量が流れる。すなわち、印加信号が定まれ
ば該印加信号に対応する通過流量が規定される。通常、
前記制御弁２４の流量特性は予め仕様規格等により定め
られている。バルブ設定部３４は、塗装時の質量流量Ｑ
１が定まれば設定により該質量流量Ｑ１に対応する電流
又は電圧を発生するもので、第二切替スイッチ３６がＯ
Ｎ接点側に接続することにより制御弁４は開弁時の質量
流量Ｑ、が流通する開度で弁開する。First, the mass flow meter 23 utilizes the Coriolis force, and when the U-shaped conduit is vibrated with a constant amplitude around the support axis, the U-shaped conduit has a Coriolis force proportional to the mass flow rate about the axis of symmetry. A moment is generated and a torsional displacement is generated, and an analog signal proportional to this torsional displacement is outputted from the converter 23a. - When an analog signal such as current or voltage is applied to the force control valve 4, the valve body rises to open the valve and change the flow coefficient (Cv value). Therefore, if the differential pressure between the upstream and downstream sides is constant, the control valve 24 receives a signal and a flow rate flows as a function of the signal. That is, once the applied signal is determined, the passing flow rate corresponding to the applied signal is determined. usually,
The flow rate characteristics of the control valve 24 are determined in advance by specifications and the like. The valve setting section 34 controls the mass flow rate Q during painting.
1 is determined, a current or voltage corresponding to the mass flow rate Q1 is generated depending on the setting, and the second changeover switch 36 is set to O.
By connecting the control valve 4 to the N contact side, the control valve 4 opens at an opening such that a mass flow rate Q when the valve is opened flows.
一方、制御部３２においては、第一切替スイッチ３５は
ＯＦＦ接点側に切替っており自己ループを形成し、流量
設定部３１の設定信号の印加にょり出力ＭＶは前記設定
信号に固定され、アナログメモリ３３に設定信号と等し
い信号値が記憶される。この時点では電磁弁２７は１弁
しているが、電磁弁２８は閉じられて４゛リノズル２５
よりの塗料噴射は行われない。On the other hand, in the control section 32, the first changeover switch 35 is switched to the OFF contact side and forms a self-loop, and when the setting signal of the flow rate setting section 31 is applied, the output MV is fixed to the setting signal, and the analog A signal value equal to the setting signal is stored in the memory 33. At this point, the solenoid valve 27 is operating 1 valve, but the solenoid valve 28 is closed and the 4 inch nozzle 25 is closed.
Further paint injection is not performed.
次に、この状態で、第二切替スイッチ３６はＯＮ側に切
替えて前記の値で開弁じ塗装開始の指令信号により電磁
弁８が開弁されると、質量流量Ｑ、に設定された制御弁
４を流通する塗料は第４図の１２時間の間で、流量は質
量流量Ｑ、に向けて上昇し、同時に質量流量計２３によ
り質量流量が計測され、変換器２３’ａより信号出力さ
れる。Next, in this state, the second changeover switch 36 is switched to the ON side and opened at the above value. When the solenoid valve 8 is opened by the command signal to start painting, the control valve is set to the mass flow rate Q. During the 12 hours shown in Fig. 4, the flow rate of the paint flowing through 4 increases toward the mass flow rate Q, and at the same time, the mass flow rate is measured by the mass flow meter 23, and a signal is output from the converter 23'a. .
′ｒ１時間後には制御弁２４を流通する塗料流量は設定
された質量流量Ｑ１よりもわずかに小さいか大きい量（
図においては僅かに小さい）に達する。After 1 hour, the paint flow rate flowing through the control valve 24 is slightly smaller or larger than the set mass flow rate Q1 (
(slightly smaller in the figure).
次のＴ１時間の間では、第一切替スイッチ３５はＯＮ接
点側に切替わり、第二切替スイッチ３６はＯＦＦ接点側
に切替わり通常のＰＩＤ （比例・微分・積分）制御を
開始する。この場合、塗料の質量流量は前記の如く質量
流量Ｑ１近傍であり、制御弁２４も質量流量Ｑ、を流通
する弁開度近傍に開弁じているので、偏差量は極めて小
さく、微小な遅れをもって定値制御動作に入り、流量の
立上り期間Ｔ、での定量制御動作は短時間に終了する。During the next time T1, the first changeover switch 35 is switched to the ON contact side, and the second changeover switch 36 is switched to the OFF contact side, and normal PID (proportional, differential, integral) control is started. In this case, the mass flow rate of the paint is near the mass flow rate Q1 as described above, and the control valve 24 is also opened near the valve opening that allows the mass flow rate Q to flow, so the amount of deviation is extremely small and there is no delay. The fixed value control operation starts, and the quantitative control operation during the rise period T of the flow rate ends in a short time.
次の期間では、第一切替スイッチ３５をＯＦＦ接点側に
切替えて自己ループを形成し、期間Ｔ。In the next period, the first selector switch 35 is switched to the OFF contact side to form a self-loop, and period T begins.
で定められた安定した流量値に対応する電圧値を保持す
るとともに、アナログメモリ３３に該電圧値を記憶し、
制御弁２４を開弁じ続は安定した流量値を保持しノズル
２５より塗料を噴射する。塗料の噴射はＴ−Ｔ、の期間
続けられ、この期間に達すると電磁弁２４は閉止され一
回目の塗装は完了する。holding a voltage value corresponding to a stable flow rate value determined by and storing the voltage value in the analog memory 33;
As long as the control valve 24 is kept open, a stable flow rate value is maintained and paint is injected from the nozzle 25. The spraying of the paint continues for a period of T-T, and when this period is reached, the solenoid valve 24 is closed and the first coating is completed.
次回の塗装においては、前記同様の動作が繰返される。In the next painting, the same operation as described above is repeated.
以上の操作により、塗装開始の初期段階でオープンルー
プで開弁じて流量の急速な立上りを実現し、設定値近傍
に達した時点で制御に切替るので制御偏差は小さく極め
て短時間に制御動作が完了するので短時間で高精度な設
定質量流量が得られる。By the above operation, the valve is opened in an open loop at the initial stage of starting painting to achieve a rapid rise in flow rate, and control is switched to when it reaches near the set value, so control deviation is small and control operation can be performed in an extremely short time. Since the process is completed, a highly accurate set mass flow rate can be obtained in a short time.
なお上記の説明においては、流量制御部３２と制御弁２
４との間に、アナログメモリ３３を配設したが、第一切
替スイッチ３５の切替え時間を第二切替スイッチ３６の
切替時間よりも僅かに遅らせることによりアナログメモ
リ３３を不要とすることができる。Note that in the above description, the flow rate control section 32 and the control valve 2 are
Although the analog memory 33 is disposed between the first selector switch 35 and the second selector switch 36, the analog memory 33 can be made unnecessary.
また１、３Ｆ、記説明においては塗料の噴射について説
明したが、塗料に限られたものではなく一般の流体に適
用できる。Furthermore, in the descriptions of 1 and 3F, the explanation was given regarding the injection of paint, but the invention is not limited to paint and can be applied to general fluids.
羞−一末
以一りの説明から明らかなように、本発明の流量コント
ロールシステムによれば、塗料等の流体を質量流量とし
て検知して制御し噴射することにより温度変化による体
積流量が変化する等の不具合をなくすることができる。As is clear from the above explanation, according to the flow rate control system of the present invention, the volumetric flow rate changes due to temperature changes by detecting, controlling and injecting fluid such as paint as a mass flow rate. It is possible to eliminate such problems.
更には設定された設定信号との比較制御を初期段階では
オープンループで行ない質量流量が設定値に達する直前
で帰還ループを形成して制御することにより応答性が優
れ、しかも、高精度に塗料等流体の質量流量を計測して
ノズル噴射することができ、無駄なく流体を利用できる
。In addition, comparison control with the set signal is performed in an open loop at the initial stage, and a feedback loop is formed just before the mass flow rate reaches the set value. The mass flow rate of fluid can be measured and injected from the nozzle, allowing fluid to be used without waste.
第１図は、本発明の流量コントロールシステムの一実施
例の構成を示すブロック図、第２図は、本発明の質量流
量のパターンを示す図、第３図は、本発明の他の実施例
の流量コントロールシステムの構成図、第４図は、他の
実施例による質量流量のパターンを示す図、第５図は、
自動車の車体塗装の概要を説明する図、第６図は、従来
の塗装ノズルの構成を示す図である。
ｌ・・・容器、２・・・塗料、３・・・質量流量計、４
・・・制御弁、５・・・ノズル、６・・・ポンプ、７，
８・・・電磁弁、９・・・配管、１０・・・制御手段、
１１・・・流量設定部、１２・・・制御部、１３・・・
Ａ／Ｄ変換器。
第２図
第４図
第５区
第６図FIG. 1 is a block diagram showing the configuration of one embodiment of the flow rate control system of the present invention, FIG. 2 is a diagram showing the mass flow rate pattern of the present invention, and FIG. 3 is another embodiment of the present invention. 4 is a diagram showing the mass flow rate pattern according to another embodiment, and FIG. 5 is a diagram showing the configuration of the flow rate control system.
FIG. 6, which is a diagram illustrating an overview of car body painting, is a diagram showing the configuration of a conventional painting nozzle. l... Container, 2... Paint, 3... Mass flow meter, 4
...Control valve, 5...Nozzle, 6...Pump, 7,
8... Solenoid valve, 9... Piping, 10... Control means,
11...Flow rate setting section, 12...Control section, 13...
A/D converter. Figure 2 Figure 4 District 5 Figure 6
Claims (1)
び前記流体源から給液される流体を噴射するノズルを直
列接続した流路において、前記流体を、所定時間毎の期
間に噴射し、噴射する流体の質量流量を所定の質量流量
設定値に制御する制御弁の制御手段を具備したことを特
徴とする流量コントロールシステム。 ２、前記流量コントロールシステムにおいて、流体噴射
期間の立上りにおいて質量流量設定信号に略々等しい信
号を発信する信号手段により制御弁を開弁し、質量流量
が設定値近傍に達する時期に、予め設定した前記質量流
量設定信号と質量流量計信号とを比較し質量流量が設定
値となるように制御弁を制御駆動することを特徴とした
流量コントロールシステム。 ３、前記期間において制御弁を制御駆動し、質量流量が
設定値に達したとき、制御を解き記憶した設定信号によ
り制御弁を駆動することを特徴とした請求項１記載の流
量コントロールシステム。[Scope of Claims] 1. In a flow path in which a mass flow meter communicating with a fluid source, a control valve, a valve means, and a nozzle for injecting fluid supplied from the fluid source are connected in series, the fluid is supplied for a predetermined period of time. 1. A flow rate control system comprising a control valve control means for controlling a mass flow rate of a fluid to be injected at a predetermined mass flow rate setting value. 2. In the flow rate control system, the control valve is opened by a signal means that transmits a signal substantially equal to the mass flow rate setting signal at the rise of the fluid injection period, and a preset signal is set at a time when the mass flow rate reaches near the set value. A flow rate control system comprising: comparing the mass flow rate setting signal with a mass flow meter signal and controlling and driving a control valve so that the mass flow rate becomes a set value. 3. The flow rate control system according to claim 1, wherein the control valve is controlled and driven during the period, and when the mass flow rate reaches a set value, the control is released and the control valve is driven by the stored setting signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34124290A JPH04209016A (en) | 1990-11-30 | 1990-11-30 | Flow rate control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34124290A JPH04209016A (en) | 1990-11-30 | 1990-11-30 | Flow rate control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04209016A true JPH04209016A (en) | 1992-07-30 |
Family
ID=18344502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34124290A Pending JPH04209016A (en) | 1990-11-30 | 1990-11-30 | Flow rate control system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04209016A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06318116A (en) * | 1993-05-10 | 1994-11-15 | Nec Corp | Gas flow rate controller |
| JP2000262948A (en) * | 1999-03-23 | 2000-09-26 | Konica Corp | Slide bead coating method and slide bead coating device |
| JP2007206936A (en) * | 2006-02-01 | 2007-08-16 | Ckd Corp | Flow rate control system |
| JP2008089373A (en) * | 2006-09-29 | 2008-04-17 | Oval Corp | Flow measurement by coriolis flowmeter, and flow controller |
| JP2014057930A (en) * | 2012-09-19 | 2014-04-03 | Dainippon Screen Mfg Co Ltd | Coating device and operation method of coating device |
| CN103924223A (en) * | 2014-04-28 | 2014-07-16 | 北京七星华创电子股份有限公司 | Film thickness and gas flow modeling method applied to CVD (Chemical Vapor Deposition) film-forming process and film thickness adjusting method |
| JP2015116534A (en) * | 2013-12-18 | 2015-06-25 | 日東電工株式会社 | Coating apparatus and production method of coating film |
| JP2015531680A (en) * | 2012-08-23 | 2015-11-05 | フィニッシング ブランズ ホールディングス，インコーポレイティド | System and method for using electrostatic tools |
-
1990
- 1990-11-30 JP JP34124290A patent/JPH04209016A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06318116A (en) * | 1993-05-10 | 1994-11-15 | Nec Corp | Gas flow rate controller |
| JP2000262948A (en) * | 1999-03-23 | 2000-09-26 | Konica Corp | Slide bead coating method and slide bead coating device |
| JP2007206936A (en) * | 2006-02-01 | 2007-08-16 | Ckd Corp | Flow rate control system |
| JP2008089373A (en) * | 2006-09-29 | 2008-04-17 | Oval Corp | Flow measurement by coriolis flowmeter, and flow controller |
| JP4684202B2 (en) * | 2006-09-29 | 2011-05-18 | 株式会社オーバル | Flow measurement and flow control device with Coriolis flow meter |
| JP2015531680A (en) * | 2012-08-23 | 2015-11-05 | フィニッシング ブランズ ホールディングス，インコーポレイティド | System and method for using electrostatic tools |
| JP2014057930A (en) * | 2012-09-19 | 2014-04-03 | Dainippon Screen Mfg Co Ltd | Coating device and operation method of coating device |
| JP2015116534A (en) * | 2013-12-18 | 2015-06-25 | 日東電工株式会社 | Coating apparatus and production method of coating film |
| CN103924223A (en) * | 2014-04-28 | 2014-07-16 | 北京七星华创电子股份有限公司 | Film thickness and gas flow modeling method applied to CVD (Chemical Vapor Deposition) film-forming process and film thickness adjusting method |
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