CN103309288A - Automatic control system of filament bundle oil agent concentration - Google Patents
Automatic control system of filament bundle oil agent concentration Download PDFInfo
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- CN103309288A CN103309288A CN2012100612850A CN201210061285A CN103309288A CN 103309288 A CN103309288 A CN 103309288A CN 2012100612850 A CN2012100612850 A CN 2012100612850A CN 201210061285 A CN201210061285 A CN 201210061285A CN 103309288 A CN103309288 A CN 103309288A
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Abstract
The invention relates to an automatic control system of a filament bundle oil agent concentration. One end of a medium inlet stop valve is connected with a thin oil agent transfer pump, and the other end of the medium inlet stop valve is connected with a sampling valve; one end of the sampling valve is connected with an on-line concentration analyzer; the on-line concentration analyzer is connected with one end of an outlet stop valve; the other end of the outlet stop valve is connected with a sampling backflow pipeline and the backflow pipeline is connected with the top of the thin oil agent pot; the on-line concentration analyzer is connected with a change-over switch through a wire; the change-over switch is connected with an on-site regulator and a DCS (distributed control system) regulator; the on-site regulator and the DCS regulator are respectively connected with the other change-over switch; the other change-over switch is connected with a regulating valve; a stop interlock signal sending terminal of a crimper is connected with a DCS control system; the DCS control system is connected with the regulating valve; an inlet of the regulating valve is connected with an outlet of a thick oil agent pump; an outlet of the regulating valve is connected with an inlet of the thin oil agent transfer pump; and an inlet of the thin oil agent transfer pump is connected with an outlet of the thin oil agent pot. The control system can realize the automatic control of the thin oil agent concentration so that the qualified rate of the pumped filament bundle oil agent is substantially increased.
Description
Technical field
The present invention relates to a kind ofly in acrylics filament oils operation, oil concentration is carried out the oil concentration automatic control system of analysis and control.
Background technology
The UR-20 type concentration analyzer of producing take Italian Maselli company is as foundation, in conjunction with the tow process characteristics that oils, background technology is described below:
Flow process as shown in Figure 1, the canned dense finish of 200Kg is through heating, with pump suction dense finish tank.Dilute at dense finish tank, final concentration reaches approximately 17%.Mix with the thin oil agent of circulation through dense finishing oil pump, filtrator and variable valve, be mixed with the agent of 1%-2.5% thin oil, then squeeze into the finishing bathtray of tow production line through finishing oil pump and heat interchanger, tow is oiled.Because tow is constantly taken away finish from finishing bathtray, the oil concentration in the groove will constantly reduce.The thin oil agent utilized difference in height to flow back to thin oil agent tank by pipeline after oil concentration reduced in the finishing bathtray.
2. oil concentration control brief introduction
In tow was produced, the oil concentration of technological requirement was 1%-3%, and oil concentration is low, and variation range is narrow, adds the singularity of oil agent, realized detecting with steadily control is very difficult automatically.Some device adopts volume pump and hand valve quantitatively to add dense finish and controls the thin oil agent concentration.Some devices detect and adopt ANACON type refractometer to detect control, after coming into operation, owing to having many problems aspect detection and the control, cause system normally to move and failure.
3. the problem that exists of background technology
(1) adopt volume pump and hand valve quantitatively to add the automatic control that dense finish can't be realized oil concentration.Making tow contain oil index (0.2%-0.4%) can't be guaranteed.
(2) problem that adopts ANACON type refractometer to detect the control appearance is: 1) refractometer is installed on the Trunk Line, and medium temperature is up to 82 ℃, and this just causes, and the refractometer failure rate is high, the life-span is short.When 2) refractometer detects finish, detect the border sheet easily contaminated, need often pull down maintenance.But refractometer adopts and is bolted on the Trunk Line, need stop the line dismounting when safeguarding, this namely affects production, and dismounting is trouble again, and maintenance difficulties is large.3) away from check point is added a little too from dense finish, cause to detect to lag behind, control is unstable.4) refractometer before only has manual temperature compensation, without automatic temperature compensation function.This is so that when the finish temperature variation, compensation can't from motion tracking, cause instrument to detect inaccurate.5) after spinning threadling stops, again drive, the concentration of thin oil agent is always more higher than originally.
Summary of the invention
The objective of the invention is to design a kind of tow oil solution concentration automatic control system, realize the on-line analysis of thin oil agent concentration and the automatic control that dense finish is added, make the tow oleaginousness meet the requirements of numerical value.
Tow oil solution concentration automatic control system of the present invention is to be made of thin oil agent discharge pump, medium inlet stop valve, sample valve, online concentration analyzer, outlet shutoff valve, sampling reflux pipeline, change-over switch, Field adjustment device, DCS regulator, change-over switch, DCS control system, crimping machine, variable valve, thin oil agent tank, dense finish tank, dense finishing oil pump;
Stop valve one end in medium inlet links to each other with thin oil agent discharge pump, and the other end links to each other with sample valve; Sample valve one end links to each other with online concentration analyzer by threeway; The outlet of online concentration analyzer links to each other with outlet shutoff valve; The other end of outlet shutoff valve directly links to each other with φ sampling reflux pipeline, and the reflux pipeline outlet directly links to each other with thin oil agent tank top; The output signal end of online concentration analyzer links to each other with change-over switch on the control box by wire; Change-over switch links to each other with the DCS regulator with the Field adjustment device by wire; The Field adjustment device links to each other with switch by wire with the DCS regulator; Switch links to each other with variable valve by wire; The parking interlocking signal of crimping machine sends end and links to each other with the DCS control system by wire; The DCS control system links to each other with variable valve by wire; The variable valve entrance is connected with dense finishing oil pump outlet, and the variable valve outlet links to each other with the entrance of thin oil agent discharge pump, and the entrance of thin oil agent discharge pump links to each other with the outlet of thin oil agent tank.
The present invention thes contents are as follows:
1. Control System Design:
The finish control system is comprised of online concentration analyzer, regulator, variable valve, switching controls case, industrial computer and desk-top concentration analyzer.
Online concentration analyzer is the UR-20 type concentration analyzer that Italian Maselli surveying instrument company produces, and concentration analyzer shows with scene temperature and concentration, and is inner with setting program.It is φ 16 that concentration analyzer is installed bore, both sides are with welding tip is installed, welding tip one end and reflux pipeline are by being weldingly connected, the other end detects thorax by buckle and analyser and links to each other, the detection gauge outfit of analyser is fixed by snap the detection on the thorax, between thorax and the gauge outfit with sealing ring, to prevent dielectric leakage.This analyser is owing to adopting buckle to install, and is very convenient when detecting thorax internal check and cleaning detection lug in the dismounting gauge outfit, only needs tens second time.The effect of concentration analyzer mainly is to detect oil concentration, and it is converted to the 4-20mA current signal carries out teletransmission, so that show and control.
The field control case is of a size of 600 * 500 * 300mm, and the above is equipped with Field adjustment device, two change-over switches, power switch and connecting terminal blocks.
The Field adjustment device is the XMA5000 type regulator that China hundred big-and-middle control instrument and meter companies produce, and is of a size of 150 * 80 * 40mm.It is with showing on the spot, and is inner with various setting programs.Pid parameter can be set by program.Its effect is receiving and analyzing instrument concentration signal and shows on the spot and control.
What variable valve was selected is that the Daqing petrochemical company instrument is repaiied the ZMSZ-FP type variable valve that factory produces.Nominal diameter is 20mm, and specified Cv value is 0.4.Its effect is the control that realizes dense finish addition.
Desk-top concentration analyzer is the desk-top concentration analyzer of LR-01 type that Italian Maselli surveying instrument company produces, and is of a size of 300 * 300 * 50mm.Online refractometer is in detecting the finish process, and detecting eyeglass has contaminated situation, and this makes finish control lose efficacy with regard to causing detection to be forbidden.For the accuracy that can judge in time that online concentration analyzer detects, at any time sampling is carried out offline inspection with this desk-top concentration analyzer, to follow the tracks of the working condition of online concentration analyzer.
Control system is divided field control part and pulpit DCS control system.The measuring-signal of concentration analyzer namely can be delivered to the Field adjustment device, also can deliver to pulpit DCS control system.The purpose of design is like this: under normal circumstances, show control by pulpit DCS control.Need maintenance, dissembling inspection etc. in particular cases at concentration analyzer, just variable valve is manually controlled to regulator on the spot by two switching overs on the field control case.And can realize each other redundant control for subsequent use.
Online concentration analyzer automatically converts the 0-5Brix oil concentration signal of measuring to the 4-20mADC signal and gives the Field adjustment device, this signal and given signal compare, then results conversion is relatively become the 4-20mADC signal, give variable valve and come the by-pass valve control aperture.
The detection signal of 4-20mADC is sent into again the DCS variable valve by switch, by DCS variable valve control finish addition.The DCS variable valve is to be made of the CENTUM-CS system, can be used for receiving the 4-20mADC oil concentration signal that concentration analyzer sends by analog input channel, and the analog output channel is used for controlling on-the-spot variable valve.The range of input and output channel card is defined as 0-100%, and is corresponding with the aperture of Field adjustment valve.Output characteristics is selected retroaction, so that corresponding with the wind pass variable valve at scene.
2. analytical sampling point is determined at thin oil agent pump discharge pipeline place:
Analyser originally is because reasons in structure, can only be installed in from thin oil agent pump discharge Trunk Line away from 8 meters is arranged on, this concentration that has just strengthened the thin oil agent detects and mistiming of the control of dense finish variable valve, has caused serious control hysteresis, makes control system be difficult to realize steady control.The sample valve of new choosing is positioned at 1 meter of thin oil agent discharge pump outlet, and this just so that detection is more timely, has reduced time lag, makes control more steady.
3. reflux pipeline, sampling gateway stop valve and sample valve are installed in sampling additional:
Reflux pipeline is selected the 316L stainless steel, adopts 4 minutes pipelines, and the material of sampling gateway stop valve and sample valve is also selected stainless steel, is spheroidal stop valve.The reflux pipeline outlet directly is added on the thin oil agent tank, makes tested thin oil agent out rear during being fed back into tank from thin oil agent tank.The thin oil agent flux of reflux pipeline will be controlled suitably by the gateway stop valve, and flow is unsuitable excessive or too small, the excessive energy dissipation that causes pump, and too small causing detected hysteresis.Sample valve is installed in the bottom of reflux pipeline, and Open Side Down, so that sample examination is carried out in the thin oil agent.The gateway stop valve of concentration analyzer is installed in tears light analyser both sides open, when concentration analyzer carries out disassembly, cleaning, so that cut off at any time the reflux pipeline medium.
4. interlocking stops:
Spinning threadling often twines rod parking phenomenon, and the thin oil agent circulation system is not stopped transport.Because thin oil agent tank is larger, whole Spin Finish System has certain hysteresis quality.Therefore, after spinning threadling stopped, valve opening kept original position, and dense finish continues to add.When the concentration of by the time whole thin oil agent system was higher, valve cut out gradually, and this just causes the fluctuation of thin oil agent concentration.Therefore, we determine design one interlocking that the cover crimping machine stops and variable valve cuts out in the DCS control loop, stop transport the purpose that dense finish stops to add to reach spinning threadling.
To computer control loop configuration the time, the operating state signal that crimping machine is sent is as a preferential controlled condition, and when crimping machine was stopped transport, interlocking stoppage in transit signal was output as 1, join in the configuration of control loop, make the control of pid control circuit be output as 0%.To reach the purpose of closing valve.
1. install the Dg16 return wire additional in the outlet of thin oil agent charge pump, check point is changed on the return wire, has solved detection hysteresis problem.
2. refractometer adopts buckle-type to fix, and is inner with cleaning device and temperature self-compensation function, this with regard to solved dismounting inconvenience, frequently cleaned, failure rate is high, without the problem of temperature self-compensation.
3. this system has solved manual control and has not lived oil concentration and pulpit without showing and the problem such as control function.
4. the interlocking that the design crimping machine is stopped transport and dense finish stops to add has solved the spinning threadling stoppage in transit, the problem that dense finish continues to add.
5. the precision desktop concentration analyzer can constantly monitor the ruuning situation of online refractometer.
6. the all-round steadily automatically control that realizes online thin oil agent concentration of this system.And the whole system failure rate is very low, is in the freedom from repairs state.
Description of drawings
Fig. 1. tow oil solution concentration automatic control system
Among Fig. 1: 1, thin oil agent discharge pump; 2, entrance stop valve; 3, sample valve; 4, online concentration analyzer; 5, outlet shutoff valve; 6, sampling reflux pipeline; 7, change-over switch 8, Field adjustment device; 9, DCS regulator; 10, change-over switch; 11, DCS control system; 12, crimping machine; 13, variable valve; 14, thin oil agent tank; 15, dense finish tank; 16, dense finishing oil pump;
Embodiment
Tow oil solution concentration automatic control system of the present invention is to be made of thin oil agent discharge pump 1, medium inlet stop valve 2, sample valve 3, online concentration analyzer 4, outlet shutoff valve 5, sampling reflux pipeline 6, change-over switch 7, Field adjustment device 8, DCS regulator 9, change-over switch 10, DCS control system 11, crimping machine 12, variable valve 13, thin oil agent tank 14, dense finish tank 15, dense finishing oil pump 16;
Stop valve 2 one ends in medium inlet link to each other with thin oil agent discharge pump 1, and the other end links to each other with sample valve 3; Sample valve 3 one ends link to each other with online concentration analyzer 4 by threeway; The outlet of online concentration analyzer 4 links to each other with outlet shutoff valve 5; The other end of outlet shutoff valve 5 directly links to each other with φ 16 sampling reflux pipelines 6, and reflux pipeline 6 outlets directly link to each other with thin oil agent tank 14 tops; The output signal end of online concentration analyzer links to each other with change-over switch 7 on the control box by wire; Change-over switch 7 links to each other with DCS regulator 9 with Field adjustment device 8 by wire; Field adjustment device 8 links to each other with switch 10 by wire with DCS regulator 9; Switch 10 links to each other with variable valve 13 by wire; The parking interlocking signal of crimping machine 12 sends end and links to each other with DCS control system 11 by wire; DCS control system 11 links to each other with variable valve 13 by wire; Variable valve 13 entrances are connected with dense finishing oil pump 16 outlets, and variable valve 13 outlets link to each other with the entrance of thin oil agent discharge pump 1, and the entrance of thin oil agent discharge pump 1 links to each other with 14 outlets of thin oil agent tank.
Instrument selection
1. online concentration analyzer:
Producer: Italian Maselli surveying instrument company
Model: UR-20
Measurement range: 0-5Brix
Measuring accuracy: ± 0.15Brix
Auto thermal compensation scope: (5-105 ℃)
Output: 4-20mA
2. regulator on the spot:
Manufacturer: China hundred big-and-middle control instrument and meter companies.
Product type: XMA5000.
3. variable valve:
Producer: the Daqing Petrochemical Complex instrument is repaiied factory
Model: ZMSZ-FP
Major parameter: nominal diameter: 20mm
Specified Cv value: 0.4
Regulating ratio: 30: 1
Bleed pressure: 0.14MPa
Signal pressure: 0.02-0.1MPa
Discharge characteristic: equal percentage
4. desk-top concentration analyzer:
Producer: Italian Maselli surveying instrument company
Model: LR-01
Measurement range: 0-5Brix
Measuring accuracy: ± 0.08Brix
This control device has been applied in the operation that oils of Daqing petrochemical company Acrylic Fibers Plant spinning threadling, has received the effect of anticipation.The whole system maintenance is little, and is easy to maintenance, and failure rate is extremely low.Thin oil agent concentration control steadily, the tow qualification rate that oils promotes greatly.
Points for attention
1. control setting value: 1.4Brix.
2. the variable valve installation site is from thin oil agent pump intake approximately away from 1 meter.
3. of thorax wiping in three days in the in-line analyzer
4. measured medium was got a sample in three hours and is detected of contrast with desk-top refractometer
5. analyser gauge outfit sealing gasket service life is about 1 year, therefore will suitably be equipped with gasket seal.
Claims (5)
1. a tow oil solution concentration automatic control system is to be made of thin oil agent discharge pump, medium inlet stop valve, sample valve, online concentration analyzer, outlet shutoff valve, sampling reflux pipeline, change-over switch, Field adjustment device, DCS regulator, change-over switch, DCS control system, crimping machine, variable valve, thin oil agent tank, dense finish tank, dense finishing oil pump; It is characterized in that:
Stop valve one end in medium inlet links to each other with thin oil agent discharge pump, and the other end links to each other with sample valve; Sample valve one end links to each other with online concentration analyzer by threeway; The outlet of online concentration analyzer links to each other with outlet shutoff valve; The other end of outlet shutoff valve directly links to each other with φ sampling reflux pipeline, and the reflux pipeline outlet directly links to each other with thin oil agent tank top; The output signal end of online concentration analyzer links to each other with change-over switch on the control box by wire; Change-over switch links to each other with the DCS regulator with the Field adjustment device by wire; The Field adjustment device links to each other with switch by wire with the DCS regulator; Switch links to each other with variable valve by wire; The parking interlocking signal of crimping machine sends end and links to each other with the DCS control system by wire; DCS control system machine links to each other with variable valve by wire; The variable valve entrance is connected with dense finishing oil pump outlet, and the variable valve outlet links to each other with the entrance of thin oil agent discharge pump, and the entrance of thin oil agent discharge pump links to each other with the outlet of thin oil agent tank.
2. a kind of tow oil solution concentration automatic control system according to claim 1, it is characterized in that: online concentration analyzer automatically converts the 0-5Brix oil concentration signal of measuring to the 4-20mADC signal and gives the Field adjustment device, this signal and given signal compare, then results conversion is relatively become the 4-20mADC signal, give variable valve and come the by-pass valve control aperture; Simultaneously, the detection signal of 4-20mADC is sent into again the DCS regulator by switch, by DCS regulator control finish addition.
3. a kind of tow oil solution concentration automatic control system according to claim 2 is characterized in that:
Described DCS regulator is comprised of the CENTUM-CS system, can be used for receiving the 4-20mADC oil concentration signal that concentration analyzer sends by analog input channel; The analog output channel is used for controlling on-the-spot variable valve; The range of input and output channel card is defined as 0-100%, and is corresponding with the aperture of Field adjustment valve.
4. a kind of tow oil solution concentration automatic control system according to claim 1, it is characterized in that: in the DCS control system, be designed with the interlock that crimping machine stops and variable valve cuts out, to computer control loop configuration the time, the operating state signal that crimping machine is sent is as a preferential controlled condition, when crimping machine was stopped transport, interlocking stoppage in transit signal was output as 1, joins in the configuration of control loop, make the control of pid control circuit be output as 0%, variable valve cuts out.
5. a kind of tow oil solution concentration automatic control system according to claim 1 is characterized in that: described sample valve is positioned at 1 meter of thin oil agent discharge pump outlet.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210061285.0A CN103309288B (en) | 2012-03-09 | 2012-03-09 | A kind of Automatic control system of filament bundle oil agent concentration |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210061285.0A CN103309288B (en) | 2012-03-09 | 2012-03-09 | A kind of Automatic control system of filament bundle oil agent concentration |
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| CN103309288A true CN103309288A (en) | 2013-09-18 |
| CN103309288B CN103309288B (en) | 2016-04-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106591971A (en) * | 2016-12-27 | 2017-04-26 | 南通醋酸纤维有限公司 | Device and method for testing oiling performance of cellulose acetate tow |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10168645A (en) * | 1996-12-10 | 1998-06-23 | Toray Ind Inc | Production of synthetic fiber |
| CN200952647Y (en) * | 2006-05-30 | 2007-09-26 | 朱勇强 | Primary liquid on-line continuous diluting and adding device |
| CN201713614U (en) * | 2010-07-13 | 2011-01-19 | 宁波大发化纤有限公司 | Automatic preparing device for spinning oil |
| CN201773331U (en) * | 2010-09-03 | 2011-03-23 | 包德全 | Alkalinity automatic control device |
| CN201864809U (en) * | 2010-09-27 | 2011-06-15 | 江阴博伦化纤有限公司 | Oiling agent recycling device |
-
2012
- 2012-03-09 CN CN201210061285.0A patent/CN103309288B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10168645A (en) * | 1996-12-10 | 1998-06-23 | Toray Ind Inc | Production of synthetic fiber |
| CN200952647Y (en) * | 2006-05-30 | 2007-09-26 | 朱勇强 | Primary liquid on-line continuous diluting and adding device |
| CN201713614U (en) * | 2010-07-13 | 2011-01-19 | 宁波大发化纤有限公司 | Automatic preparing device for spinning oil |
| CN201773331U (en) * | 2010-09-03 | 2011-03-23 | 包德全 | Alkalinity automatic control device |
| CN201864809U (en) * | 2010-09-27 | 2011-06-15 | 江阴博伦化纤有限公司 | Oiling agent recycling device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106591971A (en) * | 2016-12-27 | 2017-04-26 | 南通醋酸纤维有限公司 | Device and method for testing oiling performance of cellulose acetate tow |
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| CN103309288B (en) | 2016-04-06 |
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