JPH04208816A - Simple flow rate control apparatus - Google Patents
Simple flow rate control apparatusInfo
- Publication number
- JPH04208816A JPH04208816A JP34124190A JP34124190A JPH04208816A JP H04208816 A JPH04208816 A JP H04208816A JP 34124190 A JP34124190 A JP 34124190A JP 34124190 A JP34124190 A JP 34124190A JP H04208816 A JPH04208816 A JP H04208816A
- Authority
- JP
- Japan
- Prior art keywords
- flow rate
- fluid
- paint
- control valve
- valve
- 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 abstract description 39
- 238000002347 injection Methods 0.000 claims abstract description 21
- 239000007924 injection Substances 0.000 claims abstract description 21
- 238000005259 measurement Methods 0.000 claims description 3
- 239000003973 paint Substances 0.000 abstract description 35
- 238000010422 painting Methods 0.000 abstract description 18
- 238000013459 approach Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 10
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000007921 spray Substances 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
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Details Of Flowmeters (AREA)
- Spray Control Apparatus (AREA)
Abstract
Description
【発明の詳細な説明】
致ＪじＬ訪
本発明は、間歇的に流体を噴射する噴射流量を簡易に補
正する流量コントロールシステムに関し、より詳細には
例えば自動車の車体塗装における噴射塗料の流量を制御
する簡易流量コントロールシステムに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flow rate control system that easily corrects the injection flow rate of intermittently injecting fluid, and more specifically, the present invention relates to a flow control system that easily corrects the injection flow rate of intermittently injecting fluid. This invention relates to a simple flow rate control system.
史米韮亘
塗料は高粘度流体であり、塗装に当って最適な粘度を選
ぶことは塗装結果に重要な影響を及ぼす。Shimei Niwanei paint is a high viscosity fluid, and selecting the optimal viscosity for painting has an important effect on the painting result.
このため塗装作業には熟練度が要求されるものであり、
すべての対象に対して均等な塗装を行うことは困離であ
った。特に多量生産される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上げ
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。For this reason, painting work requires skill,
It was difficult to apply uniform coating to all objects. In particular, the quality of the paint on the body of mass-produced automobiles not only affects the corrosion resistance of the car body, but is also important for aesthetics, and it is important to ensure that the paint film has a uniform and smooth finish over the painted surface. is required. Moreover, it is a condition that effective injection be performed without waste in these operations.
第４図は、自動車の車体塗装の概要を説明する図であり
、図中、２０は車体、２１は塗料噴射の軌跡を示す。車
体２０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２ｏに対し塗料噴射の軌跡２１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２０が停止時には矢印Ｖ方向に移動しながら塗
装し、ｙｌ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. 4 is a diagram illustrating the outline of car body painting. In the figure, 20 shows the car body, and 21 shows the locus of paint injection. The vehicle body 20 moves intermittently on the X-axis, and a paint nozzle (not shown) moves as shown in a paint spray trajectory 21 to the vehicle body 2o to spray paint. That is, when the car body 20 is stopped, the nozzle paints while moving in the direction of arrow V, stops painting when it reaches yl, moves the car body △X, and once the movement is completed, paints again in the opposite direction according to the arrow. The above-mentioned painting and movement of the vehicle body are repeated as shown by the arrows in the figure, and the painting of the predetermined surface is completed. 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５図は、従来の塗装ノズルの構成を示す図で、図中、
３１，３２，３３．３４は配管、３５゜３６．３７はノ
ズル、３８，３９，３９ａ、３９ｂ、３９ｃは弁、４０
は容器、４１は分岐管である。図示においてノズル３５
，３６．３７の流量割合は各々例えばｌ、９．１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３９は閉、弁３８は開の状態で配管３１から定圧で供
給された塗料は分岐管４１を通って所定時間容器４０に
注入し、この間容器４０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
量に基づいて予め規定された表に従って弁３９ ａ、
３９ ｂ、 ３９ ｃを開閉しノズル３５，３６．
３７を選択し組合せて流量割合９，１０．１１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. 5 is a diagram showing the configuration of a conventional painting nozzle, and in the figure,
31, 32, 33.34 are pipes, 35° 36.37 are nozzles, 38, 39, 39a, 39b, 39c are valves, 40
is a container, and 41 is a branch pipe. In the illustration, nozzle 35
, 36.37 are divided into ratios of, for example, 1 and 9.1, respectively. For painting, first, as a preparatory operation, the valve 39 is closed, the valve 38 is opened, and the paint supplied from the pipe 31 at a constant pressure is injected into the container 40 for a predetermined period of time through the branch pipe 41. During this time, the inside of the container 40 is 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 39 a,
39 b, 39 c are opened and closed, and the nozzles 35, 36 .
37 is selected and combined to inject paint with a flow rate of 9, 10.11. 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
ズルの選択するだけで、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.
−１−一り−
本発明は、斜上の実情に鑑みてなされたもので、簡易安
価でしかも高精度な塗装を行なう簡易な流量コントロー
ルシステムを提供することを目的とするもので、質量流
量計、制御弁、開閉弁およびノズルを直列接続し、流体
の温度検出器を備えた流路において、流通する流体の流
量を前記制御弁が基準温度で流通する流量として設定し
、前記開閉弁を一定間隔で開閉し流体を間歇的にノズル
噴射する流体装置において、初回の間歇流体噴射は、基
準温度に換算した流体を流通する制御弁の弁開度で行い
、該弁開度で流通する前記初回の間歇流体を質量流量測
定し、該測定値と設定値との偏差を検知し、次回の間歇
流体噴射では前記偏差を補正した制御弁の弁開度で流通
し、継続する間歇流体噴射において制御弁を順次、前回
の間歇流体噴射の質量計測値に基づいた偏差を補正した
開度に補正することを目的としたものである。-1-1- The present invention was made in view of the actual situation of slanting.It is an object of the present invention to provide a simple flow rate control system that is simple, inexpensive, and performs high-precision painting. In a flow path in which a meter, a control valve, an on-off valve, and a nozzle are connected in series and a fluid temperature sensor is provided, the flow rate of the flowing fluid is set as the flow rate at which the control valve flows at a reference temperature, and the on-off valve is In a fluid device that opens and closes at regular intervals and intermittently injects fluid through a nozzle, the first intermittent fluid injection is performed at the valve opening of a control valve that circulates fluid converted to a reference temperature, and the The mass flow rate of the intermittent fluid is measured for the first time, the deviation between the measured value and the set value is detected, and the next intermittent fluid injection flows at the valve opening of the control valve that corrects the deviation, and in the continuing intermittent fluid injection. The purpose is to sequentially correct the opening degree of the control valves to correct the deviation based on the mass measurement value of the previous intermittent fluid injection.
１−五一五
本発明は、上記目的を達成するためになされたもので、
以下実施例に基づいて説明する。1-515 The present invention has been made to achieve the above object,
The following will be explained based on examples.
第１図は、本発明の簡易流量コントロールシステムの構
成を示すブロック図で、図中、ｌ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は温度検出器（Ｔ）、７はポンプ、８，９は電磁弁、
１ｏは配管、〕１は制御装置、１２は流量設定器である
。図示において、タンクｌに収容された塗料２は、ポン
プ７で定圧に加圧され、電磁弁８，９および制御弁４が
開弁されると塗料２はノズル５より噴射される。電磁弁
８，９および制御弁４の開閉は制御装置１１の指令によ
りなされ、前記制御弁４の開閉は電圧又は電流信号によ
りなされる。FIG. 1 is a block diagram showing the configuration of the simple flow rate control system of the present invention, in which l is a tank, 2 is a paint,
3 is a mass flow meter (M-M), 4 is a control valve, 5 is a nozzle,
6 is a temperature detector (T), 7 is a pump, 8 and 9 are solenoid valves,
1o is a pipe, 1 is a control device, and 12 is a flow rate setting device. In the figure, the paint 2 contained in a tank 1 is pressurized to a constant pressure by a pump 7, and when the electromagnetic valves 8, 9 and the control valve 4 are opened, the paint 2 is injected from a nozzle 5. The solenoid valves 8, 9 and the control valve 4 are opened and closed by commands from a control device 11, and the control valve 4 is opened and closed by voltage or current signals.
第２図は、制御弁４の流量特性の一例を示す図で、横軸
Ｅに制御弁４に印加される電流を縦軸Ｑには制御弁４前
後の差圧を一定とした場合において制御弁４を流通する
流量をあられす。特性曲線Ａ、Ｂ、Ｃは各々流体温度が
２０℃、２５℃。FIG. 2 is a diagram showing an example of the flow rate characteristics of the control valve 4. The horizontal axis E shows the current applied to the control valve 4, and the vertical axis Q shows the control when the differential pressure before and after the control valve 4 is constant. The flow rate flowing through valve 4 is determined. Characteristic curves A, B, and C have fluid temperatures of 20°C and 25°C, respectively.
１５℃における流量特性であり、図示のごとく制御弁４
の流量特性は流体温度に依存して定められる。一般に、
弁装置の流量特性は、前後差圧を一定としたときの流量
をボンド・インチで表わした流量係数Ｃｖ値であられさ
れ、開口面積を可変としたオリフィスの特性をもってい
る。This is the flow rate characteristic at 15°C, and as shown in the figure, the control valve 4
The flow characteristics of are determined depending on the fluid temperature. in general,
The flow characteristics of the valve device are determined by the flow coefficient Cv value, which is the flow rate expressed in bond inches when the differential pressure across the valve is constant, and has the characteristics of an orifice with a variable opening area.
従って、制御弁４を流れる流体の体積流量は、流体およ
び該流体温度が定まれば定められる。温度検出器６は流
体の温度を検知するためのものである。Therefore, the volumetric flow rate of the fluid flowing through the control valve 4 is determined once the fluid and its temperature are determined. The temperature detector 6 is for detecting the temperature of the fluid.
いま、流量設定器１２に塗料の基準温度として、例えば
２０℃（１，、、）においての流量１ＯＯＱ／ｍｉｎ
（リッタ７分）を設定したとした場合、温度検出器６は
、現時点での塗料温度例えばしを検知して、制御装置１
１において基準温度しよ、に相当する弁開度を指令して
制御弁４に電圧又は電流信号を印加する。これらの指令
は制御弁４の流量特性が知られれば、デジタル的にもア
ナログ的にも演算して出力することができる。Now, set the flow rate setting device 12 as the reference temperature of the paint, for example, a flow rate of 1OOQ/min at 20°C (1,,,).
(7 minutes per liter), the temperature detector 6 detects the current paint temperature, for example, and controls the control device 1.
1, a valve opening corresponding to the reference temperature is commanded and a voltage or current signal is applied to the control valve 4. These commands can be calculated and output either digitally or analogously if the flow rate characteristics of the control valve 4 are known.
質量流量計３は、上記の如く制御されて噴射される塗料
が設定された流量であるか否がを記録表示することによ
りチエツクするためのものである。The mass flow meter 3 is used to check by recording and displaying whether or not the paint being sprayed under the control described above is at a set flow rate.
質量流量計３は、Ｕ字導管に流れる流体の質量流量を質
量流量に比例して生ずるコリオリの力から求めるもので
、Ｕ字導管の支持軸まわりに定振幅で加振した場合、Ｕ
字導管の対称軸まわりにコリオリの力に比例するモーメ
ントが発生することを利用したもので、加振周波数に応
じた応答速度をもっている。The mass flow meter 3 determines the mass flow rate of the fluid flowing in the U-shaped conduit from the Coriolis force that is generated in proportion to the mass flow rate.
It takes advantage of the fact that a moment proportional to the Coriolis force is generated around the symmetry axis of the shaped conduit, and has a response speed that depends on the excitation frequency.
第３図は、本発明の詳細な説明するための図で、横軸に
時間、縦軸に流量をとっている。まず、流量は流量設定
器１２にＱｓで設定しておく、このとき電磁弁８は開弁
し、電磁弁９は閉弁しており、時刻ｔ、で期間Ｔ。Ｎの
間開弁される。制御装置１１は、この時点では、計測さ
れた塗料温度に基づいて制御弁４を制御し、塗料温度が
基準温度（２０℃）に換算したときの流量（質量流量）
となる弁開度を定める。しかし、制御弁４の流量特性は
製品により異なり一定ではなく、このとき流れる流体の
質量流量も設定した値Ｑｓになるとは限らず、通常偏差
を伴うものである。これを質量流量計３で計測し、この
計測結果と前記設定値Ｑｓとを比較する。従って初回の
間歇流体噴射の時間Ｔ。Ｎでは面積Ｗ１に相当する偏差
を含んだ質量流量の塗料が噴射される。時間Ｔ。ＦＦ後
の時刻し、で初回の偏差を補正した弁開度によって次回
の間歇噴射が前記同様に時間Ｔ。Ｎの間で面積Ｗ３の質
量流量の塗料噴射が行われる。この間においても前回同
様に流れた質量流量を計測し前記設定流量Ｑｓと比較し
偏差が求められる。時間℃５からの間歇噴射期間ではこ
の偏差に応じて弁開度を補正した制御弁４により面積Ｗ
３に相当する塗料が噴射される。この面積に相当する流
量と質量流量とを比較し次回に制御弁開度を補正するこ
とを繰返しこのようにして順次、塗料の体積は面積Ｗ。FIG. 3 is a diagram for explaining the present invention in detail, with the horizontal axis representing time and the vertical axis representing flow rate. First, the flow rate is set at Qs in the flow rate setting device 12. At this time, the solenoid valve 8 is opened and the solenoid valve 9 is closed, and a period T occurs at time t. The valve is opened for N. At this point, the control device 11 controls the control valve 4 based on the measured paint temperature, and calculates the flow rate (mass flow rate) when the paint temperature is converted to the reference temperature (20°C).
Determine the valve opening degree. However, the flow rate characteristics of the control valve 4 vary depending on the product and are not constant, and the mass flow rate of the fluid flowing at this time does not necessarily reach the set value Qs, but usually involves deviation. This is measured by the mass flow meter 3, and this measurement result is compared with the set value Qs. Therefore, the time T of the first intermittent fluid injection. At N, paint is injected at a mass flow rate that includes a deviation corresponding to the area W1. Time T. At the time after FF, the next intermittent injection is performed at time T in the same manner as described above, depending on the valve opening corrected for the initial deviation. Paint injection with a mass flow rate of area W3 is performed between N and W3. During this time, the mass flow rate that flowed in the same manner as last time is measured and compared with the set flow rate Qs to find the deviation. During the intermittent injection period from time ℃5, the control valve 4 corrects the valve opening according to this deviation to reduce the area W.
Paint corresponding to No. 3 is sprayed. The flow rate corresponding to this area is compared with the mass flow rate, and the control valve opening degree is corrected next time. In this way, the volume of the paint becomes the area W.
・・・の如く等間隔で噴射され設定流量Ｑｓに近づいて
噴射される。なお、上記説明においては流体を塗料とし
て述べたが流体特性が知られているものであれば何如な
る流体でもよい。... is injected at equal intervals, and is injected close to the set flow rate Qs. In the above description, the fluid was described as paint, but any fluid with known fluid characteristics may be used.
ガーー米
以上の説明から明らかなように、本発明によると、流体
の特性が知られている場合、流体温度を検知して、初回
の間歇流体噴射において基準温度における流量すなわち
質量流量とするように予め知られた温度特性に基づいて
制御弁を開閉駆動し、この間流通する質量流量と設定流
量との偏差から次回の間歇噴射流量を補正し、これを間
歇噴射ごとに繰返すので順次設定流量に近づいた質量流
量の流体噴射がなされ、噴射毎に流量精度が向上する。As is clear from the above description, according to the present invention, when the characteristics of the fluid are known, the fluid temperature is detected and the flow rate at the reference temperature, that is, the mass flow rate, is set at the first intermittent fluid injection. The control valve is opened and closed based on the temperature characteristics known in advance, and the next intermittent injection flow rate is corrected based on the deviation between the mass flow rate flowing during this period and the set flow rate.This is repeated for each intermittent injection, so the flow rate gradually approaches the set flow rate. Fluid is injected with a mass flow rate that increases the accuracy of the flow rate with each injection.
この結果簡易で安価な流量コントロールシステムが得ら
れ、しかも高精度に制御が行われる。As a result, a simple and inexpensive flow control system is obtained, and control is performed with high precision.
第１図は、本発明の簡易流量コントロールシステムの構
成を示すブロック図、第２図は、制御弁４の流量特性の
一例を示す図、第３図は、本発明の詳細な説明するため
の図、第４図は、自動車の車体塗装の概要を説明する図
、第５図は、従来の塗装ノズルの構成を示す図である。
ｌ・・・タンク、２・・・塗料、３・・・質量流量計（
Ｍ・Ｍ）、４・・・制御弁、５・・・ノズル、６・・・
温度検出器（Ｔ） 、７・・・ポンプ、８，９・・・電
磁弁、１０・・・配管、１１・・・制御装置、１２・・
・流量設定器。
第２区
第３図
第４図
篤５又FIG. 1 is a block diagram showing the configuration of the simple flow rate control system of the present invention, FIG. 2 is a diagram showing an example of the flow rate characteristics of the control valve 4, and FIG. 3 is a diagram for explaining the present invention in detail. 4 are diagrams for explaining the outline of car body painting, and FIG. 5 is a diagram showing the configuration of a conventional painting nozzle. l...Tank, 2...Paint, 3...Mass flow meter (
M・M), 4... Control valve, 5... Nozzle, 6...
Temperature detector (T), 7... Pump, 8, 9... Solenoid valve, 10... Piping, 11... Control device, 12...
・Flow rate setting device. Section 2, Figure 3, Figure 4, Atsushi 5-way
Claims (1)
続し、流体の温度検出器を備えた流路において、流通す
る流体の流量を前記制御弁が基準温度で流通する流量と
して設定し、前記開閉弁を一定間隔で開閉し流体を間歇
的にノズル噴射する流体装置において、初回の間歇流体
噴射は、基準温度に換算した流体を流通する制御弁の弁
開度で行い、該弁開度で流通する前記初回の間歇流体を
質量流量測定し、該測定値と設定値との偏差を検知し、
次回の間歇流体噴射では前記偏差を補正した制御弁の弁
開度で流通し、継続する間歇流体噴射において制御弁を
順次、前回の間歇流体噴射の質量計測値に基づいた偏差
を補正した開度に補正することを特徴とした簡易流量コ
ントロールシステム。1. In a flow path in which a mass flow meter, a control valve, an on-off valve, and a nozzle are connected in series and a fluid temperature sensor is provided, the flow rate of the flowing fluid is set as the flow rate at which the control valve flows at a reference temperature, In the fluid device that opens and closes the on-off valve at regular intervals and intermittently injects fluid through a nozzle, the first intermittent fluid injection is performed at the valve opening of the control valve through which the fluid flows, which is converted to a reference temperature, and the valve opening is measuring the mass flow rate of the first intermittent fluid flowing through the flow, detecting the deviation between the measured value and the set value;
The next intermittent fluid injection will flow at the valve opening of the control valve that has corrected the deviation, and in continuing intermittent fluid injection, the control valves will flow at the opening that has corrected the deviation based on the mass measurement value of the previous intermittent fluid injection. A simple flow control system that compensates for
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34124190A JPH04208816A (en) | 1990-11-30 | 1990-11-30 | Simple flow rate control apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34124190A JPH04208816A (en) | 1990-11-30 | 1990-11-30 | Simple flow rate control apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04208816A true JPH04208816A (en) | 1992-07-30 |
Family
ID=18344492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34124190A Pending JPH04208816A (en) | 1990-11-30 | 1990-11-30 | Simple flow rate control apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04208816A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2017043648A1 (en) * | 2015-09-11 | 2018-06-28 | 日立金属株式会社 | Mass flow controller |
-
1990
- 1990-11-30 JP JP34124190A patent/JPH04208816A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2017043648A1 (en) * | 2015-09-11 | 2018-06-28 | 日立金属株式会社 | Mass flow controller |
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