CN202399510U - System for controlling wall thickness of parison - Google Patents
System for controlling wall thickness of parison Download PDFInfo
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- CN202399510U CN202399510U CN201120552225XU CN201120552225U CN202399510U CN 202399510 U CN202399510 U CN 202399510U CN 201120552225X U CN201120552225X U CN 201120552225XU CN 201120552225 U CN201120552225 U CN 201120552225U CN 202399510 U CN202399510 U CN 202399510U
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- type germ
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Abstract
The utility model discloses a system for controlling the wall thickness of a parison. The system for controlling the wall thickness of the parison comprises a nonlinear controller, a linear displacement sensor and an actuating mechanism, wherein the linear displacement sensor is used for measuring a gap value of a mould core and feeding back the gap value of the mould core to the nonlinear controller; the nonlinear controller inquires an axial distribution curve of the wall thickness of the parison which is obtained by a Bezier curve division interpolation method to obtain a set value of the wall thickness of the parison at the moment, compares the set value of the wall thickness of the parison and a feedback value of the wall thickness of the parison, and outputs a corresponding control signal; and the actuating mechanism controls a difference value between the feedback value of the wall thickness of the parison and the set value of the wall thickness of the parison to be within a preset range according to the received control signal. The axial distribution curve of the wall thickness of the parison which is obtained by the Bezier curve division interpolation method is high in local controllability; and the nonlinear controller is adopted, so that the response speed and the anti-jamming performance of a control system are improved, and the overshoot and the fluctuation time of the control system are reduced.
Description
Technical field
The application relates to the hollow blow molding technical field, particularly relates to the thick control of type germ wall system.
Background technology
The hollow blow molding technology is to make the type embryo of plasticizing be close to the mould inner wall moulding through air pressure; The mode of production of type embryo is an extruded type; Being about to the heating plasticizing melt extrudes from the core rod slit of different shape; Form the tubbiness type embryo of different shape, the type embryo of extruding receives gravitational effect vertical hanging.Hollow container goods requirement of strength have together been stipulated minimum wall thickness (MINI W.); But early stage hollow blow molding equipment lacks the thick control of type germ wall system; For the wall thickness of the thinnest part that makes the hollow container goods reaches the minimum wall thickness (MINI W.) requirement, other positions of said hollow container goods will correspondingly thicken, and cause the waste of material; Cause cost to increase; Simultaneously the cool time of hollow container goods is long, the production cycle is long, for save cost, shorten cool time, the speed production cycle, so need the wall thickness of control type embryo.
Wall thickness control system is that controller is exported the corresponding signal of telecommunication to electrohydraulic servo valve according to the thick axial change curve of type germ wall that the user sets; Drive moving up and down of core rod by electrohydraulic servo valve; Thereby the system of the variation in control model slit is in the production process of hollow container, for guaranteeing product quality; Require controlled volume can follow the tracks of settings exactly, require response process quick simultaneously.
Traditional wall thickness control system adopts linear interpolation algorithm to obtain the thick axial change curve of type germ wall; This kind method is very easy to for the match between 2 o'clock; But the transition for two-end-point does not consider there is not rounding off between end points, requires the adjust to rounding off of operator with each end points; So basically, all to adjust complicated operation at every.The wall thickness controller adopts linear PID controller, because the execution architecture of the thick control of type germ wall system is an electrohydraulic servo system, the characteristic feature of electrohydraulic servo system is low damping, time variation, non-linear, and big inertia and hysteresis quality are arranged.Traditional linear pid algorithm can cause the fluctuation of bigger hyperharmonic long period at big inertia and hysteresis quality integral.
The utility model content
For solving the problems of the technologies described above, the application embodiment provides the thick control of a kind of type germ wall system, and to solve thick control method of existing type germ wall and complex, long problem of overshoot great fluctuation process time, technical scheme is following:
The thick control of a kind of type germ wall system comprises: gamma controller, Linear displacement transducer and executing agency, wherein,
Said Linear displacement transducer is used to measure said core rod gap width, and feeds back to said gamma controller as the thick value of feedback of type germ wall;
The inquiry of said gamma controller is cut apart the thick axial distribution curve of type germ wall that interpolation method obtains by Bezier, obtains the thick setting value of type germ wall this moment, and relatively thick setting value of this type germ wall and the thick value of feedback of said type germ wall, the output control signal corresponding;
Said executing agency links to each other with said gamma controller, is used for according to the said control signal that receives, controls difference between thick value of feedback of said type germ wall and the thick setting value of said type germ wall in preset range.
Preferably, said gamma controller is non-linear ratio-derivative controller, comprising: wall thickness axial distribution curved unit, proportional controller, first wave filter, derivative controller and amplitude limit output unit, wherein:
Said wall thickness axial distribution curved unit, the wall thickness setting value that is used to store said type embryo;
Said proportional controller carries out scale operation to the wall thickness setting value of said type embryo and the difference between the thick value of feedback of said type germ wall, obtains the thick error of said type germ wall;
Said first wave filter is used for the thick value of feedback of said type germ wall that receives is carried out high-pass filtering, obtains the thick value of feedback of type germ wall after the high-pass filtering, and offers said derivative controller;
Said derivative controller is used for the thick value of feedback of type germ wall after the said high-pass filtering is differentiated, and obtains the thick value of feedback of the first type germ wall, and superposes with the thick error of said type germ wall, controlled information, and offer said amplitude limit output unit;
Said amplitude limit output unit is used for producing the control signal of amplitude in preset range according to the said control information that receives.
Preferably, said gamma controller also comprises second wave filter, is used for the interfering signal of the thick value of feedback of the said type germ wall of filtering.
Preferably, said gamma controller also comprises:
With the mode selecting unit that the thick distribution curve of said type germ wall unit links to each other, be used to select the mode of operation of the thick control of said type germ wall system, this mode of operation comprises: continous way wall thickness control model and storing type wall thickness control model.
Preferably, said executing agency is an electrohydraulic servo system, and said electrohydraulic servo system comprises: proportional servo valve and hydraulic jack, wherein:
Said proportional servo valve receives the control signal of said gamma controller output, controls the position of piston in the said hydraulic jack, so that the difference between core rod gap width and the thick setting value of said type germ wall is in preset range.
Preferably, said gamma controller is a programmable logic controller (PLC).
Technical scheme by above the application embodiment provides is visible; The thick control of the said type germ wall system that the application embodiment provides; Adopt Bezier to cut apart differential technique and obtain the thick axial distribution curve of type germ wall, it had both satisfied the requirement of end points rounding off, and certain some stretch range that can overcome existing natural batten differential technique is again crossed the shortcoming that senior general causes the distant place curve deformation; Therefore, it is good to adopt Bezier to cut apart the partial controllable property of the thick axial distribution curve of type germ wall that differential technique obtains.And the controller of the thick control of said type germ wall system adopts gamma controller, has improved the response speed and the interference free performance of control system, has reduced the overshoot and the fluctuation time of control system.
Description of drawings
In order to be illustrated more clearly in the application embodiment or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiment that put down in writing among the application, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of the thick control of a kind of type germ wall of the application embodiment system;
Fig. 2 is the structural representation of the thick control of the another kind of type germ wall of the application embodiment system.
The specific embodiment
In the hollow blow molding process; The very little abrupt change of Thickness Distribution curve all can cause the variation that hollow plastic product is bigger; Therefore, require will can lead continuously between each set point on the thick axial distribution curve of type germ wall, the utility model embodiment is considering under the situation that end points rounding off and local control characteristic are independent of each other; Adopt Bezier to cut apart interpolation method and obtained the thick axial distribution curve of type germ wall; And then obtaining the thick setting value of type germ wall, this method can satisfy the requirement of endpoint curve rounding off, can overcome the bad shortcoming of local control characteristic of natural spline interpolation method again.
The system that during the thick control of type germ wall system the folding degree in core rod slit is controlled is in the production process of hollow plastic container goods, for guaranteeing product quality; Require controlled volume can follow the tracks of the wall thickness setting value exactly, simultaneously, also require the response speed of control system fast; With simple 10 wall thickness control systems is example, and under the pattern of extruding continuously, the shortest time of enumerating a type embryo from die head is 5s; Will realize in time the function curve of a finite length need being divided into 10 paragraphs at 5s, each paragraph has only the time of about 0.5s; Theoretical according to following the tracks of; The unit pulse of the thick control of type germ wall system should be 1/5～1/10 of each paragraph time transit time, i.e. 0.05s～0.1s, and this just requires the thick control system response time of type germ wall very fast.And in response simultaneously so rapidly, will guarantee that also controlled volume can accurately follow the tracks of the thick settings of said type germ wall, otherwise wall thickness control will lose meaning.Therefore, the utility model embodiment provides a kind of gamma controller, has improved the response speed of controller, hydraulic system parameters is changed insensitive, strong robustness, and certain adaptability is arranged, and can effectively overcome the big inertia and the hysteresis quality of electrohydraulic servo system.
In order to make those skilled in the art person understand the technical scheme among the application better; To combine the accompanying drawing among the application embodiment below; Technical scheme among the application embodiment is carried out clear, intactly description; Obviously, described embodiment only is the application's part embodiment, rather than whole embodiment.Based on the embodiment among the application, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all should belong to the scope of the application's protection.
See also Fig. 1, show the structural representation of the thick control of a kind of type germ wall of the application embodiment system, this system comprises: gamma controller 1, Linear displacement transducer 2 and executing agency 3, wherein:
The input of gamma controller 1 links to each other with Linear displacement transducer 2, and output links to each other with executing agency 3.
Said Linear displacement transducer 2 is used for said core rod gap width, offers said gamma controller 1 as the thick value of feedback of type germ wall.
Concrete.Tearing the mobile phone gamma controller can realize through programmable logic controller (PLC).Certainly, also can adopt other controller to realize that the application does not limit this.
Concrete; The thick axial distribution curve negotiating of said type germ wall Bezier is cut apart interpolation method and is obtained; This method had both satisfied the requirement of unlimited end points rounding off; Simultaneously, also overcome the shortcoming of the excessive distant place curve deformation that causes of certain some stretch range of natural spline interpolation method, had the good characteristics of partial controllable property.
The thick control of the type germ wall system that present embodiment provides; Adopt Bezier to cut apart interpolation method and obtain the thick axial distribution curve of said type germ wall; And utilize gamma controller according to thick setting value of said type germ wall and the thick value of feedback of type germ wall; Regulate the core rod gap width, thereby rapid adjustment core rod gap width makes difference between itself and the thick setting value of type germ wall in preset range, has improved the response speed of the thick control of type germ wall system; Reduce the overshoot and the fluctuation time of control system, and then controlled the wall thickness of said type embryo well.
To introduce below and adopt Bezier to cut apart the process that interpolation method obtains the thick axial distribution curve of type germ wall.
Because the speed of extrusion type embryo is certain; Therefore; The axial length of the type embryo that blow moulding machine is extruded is directly proportional with finding time, and has certain corresponding relation between the wall thickness of the axial length of type embryo and type embryo, so find time and there is certain corresponding relation in the type germ wall between thick.Adopting Bezier to cut apart the thick axial distribution curve of type germ wall that interpolation method obtains is to find time and the thick corresponding curve map of type germ wall.
Concrete, when each regional transition point of type embryo is considered, to introduce Bezier and cut apart differential technique, the thick distribution curve of type germ wall is mainly realized by the Thickness Distribution set of curves.The thick axial distribution curve of type germ wall is divided into several three rank Beziers:
is that i three rank Beziers distribute.
Distribute according to three rank Beziers;
(0≤i≤n) on the thick distribution curve of type germ wall;
is outside the thick distribution curve of type germ wall; Be curvature of curve typing point;
can adjust like this; Consider the single order geometric continuity of current adjustment point during adjustment, can obtain confirming that the formula of adjustment
coordinate figure is following:
(formula 2)
In the formula 2, P
1 I+1Be the coordinate of i+2 second point on the three rank Beziers, P
0 I+1Be the coordinate of i+2 first point on the three rank Beziers, P
3 iBe the coordinate of i+1 the 4th point on the three rank Beziers, P
2 iBe the coordinate of i+1 the 3rd point on the three rank Beziers, λ is a curvature of curve.
Like this, realized the partial controllable property of the thick distribution curve of type germ wall, and whole piece curve single order geometry continuously, reaches the requirement of the thick curve rounding off of type germ wall.
For single Bezier fragment, adopt three times the Bezier formula:
C (t)=(1-t)
3P
0+ 3t (1-t)
2P
1+ 3t
2(1-t) P
2+ t
3P
3(0≤t≤1) (formula 3)
In the formula 3, C (t) is t time following coordinate function, and t is the time independent variable, between 0 and 1, and P
0, P
1, P
2, P
3Be polygonal 4 points of characteristic, P
0Be starting point, P
3Be terminal point.
The data of each point on the calculated curve obtain the setting data of wall thickness profile at last, during adjusting, and the end points of each Bezier that stretches, thus reach the requirement of wall thickness control.This mode can satisfy the requirement of endpoint curve rounding off, can overcome the shortcoming of the excessive distant place curve deformation that causes of certain some stretch range of natural spline interpolation method again.
See also Fig. 2, show the structural representation of a kind of gamma controller of the application embodiment, this gamma controller comprises:
Wall thickness axial distribution curved unit 101, proportional controller 102, first wave filter 103, derivative controller 104, amplitude limit output unit 105, wherein:
Said wall thickness axial distribution curved unit 101 is used to store the thick axial distribution curve of said type germ wall, and promptly the wall thickness setting value of type embryo specifically can realize through memory.
Said proportional controller 102 is used for the difference between thick setting value of said type germ wall and the thick value of feedback of type germ wall that receives is carried out scale operation, obtains the thick error of said type germ wall.
Said first wave filter 103 is used for the thick value of feedback of said type germ wall is carried out high-pass filtering, obtains the thick value of feedback of type germ wall after the high-pass filtering, and offers said derivative controller 104.
Said derivative controller 104; Be used for the thick value of feedback of type germ wall after the said high-pass filtering is differentiated; Obtain the thick value of feedback of the first type germ wall; And this thick value of feedback of first type germ wall and the thick error of said type germ wall superposeed, controlled information, and offer said amplitude limit output unit 105.
Said amplitude limit output unit 105 is used for producing the control signal of amplitude in preset range according to the said control information that receives.
Concrete; This gamma controller receives the core rod gap width that Linear displacement transducer records; It is the thick value of feedback of type germ wall; Thick value of feedback of this type germ wall and the thick setting value of obtaining from the thick axial distribution curved unit 101 of said type germ wall of corresponding type germ wall are compared, and carry out scale operation, thereby obtain the thick error of type germ wall; Simultaneously; Utilize first wave filter 103 to filter the low frequency part in the thick feedback signal of said type germ wall; Obtain the high frequency non-linear partial in the thick feedback signal of type germ wall, and differentiate, thereby eliminate the sudden change that the thick feedback signal of nonlinear type germ wall causes through derivative controller.Thick error of said type germ wall and the thick value of feedback stack of said first type germ wall back are offered amplitude limit output unit 105 as control information, final by the control signal of amplitude limit output unit output amplitude in preset range.
The gamma controller that present embodiment provides is at traditional linear PID (Proportion Integration Differentiation; PID) on the basis of controller; Thick error of type germ wall and the thick value of feedback of non-linear type germ wall are superposeed, and abandon integral controller, differential is carried out suitable one order inertia filtering; Adding an adjustable gain Kp regulates; Obtain gamma controller, improved system response time, and the thick setting value of following-up type germ wall quick and precisely.
In addition; After the control signal of above-mentioned gamma controller output adds vibrating signal, be used for controlling electrohydraulic servo system, said vibrating signal is a kind of high-frequency oscillation signal that is superimposed upon on the servo valve input signal; The effect of vibrating signal is the play that reduces or eliminates in the servo valve; In the two-stage servo valve, vibrating signal provides a relative motion for the spool and the valve pocket of prestage, thereby has eliminated the friction that is existed by two interelements effectively and the play that produces.Since vibrating signal make main valve remain on a kind of amplitude minimum, read in the very high vibrational state, therefore, be advisable to preventing 2～3 times of stuck servo valve frequency range.The amplitude of vibrating signal is advisable with the play width that overcomes in the servo valve, such as, be equivalent to the main valve plug amplitude about about 2.5 μ m of moving.
Preferably, see also Fig. 2, said gamma controller also comprises: second wave filter 106 and mode selecting unit 100, wherein:
Said second wave filter 106 is used for the interfering signal of the thick value of feedback of filtering type germ wall, and offers the said proportional controller 102 and first wave filter 103.
Said mode selecting unit 100 is used for the mode of operation of the thick control of selection type germ wall system, and concrete, the thick control of type germ wall has two kinds of control modes, and a kind of is the time control mode, and another kind is based on the Position Control mode of accumulator.The time control mode is also claimed continous way, extrudes in the cycle at a type embryo exactly, and the wall thickness value of current time is set in time-based change, thereby reaches the purpose of control wall thickness; It is control that the Position Control of accumulator also weighs up material, and the zone that just will shoot material is divided into counting of wall thickness control, like 300 points, 100 points, 50 points; At this wall thickness setting numerical value of the star in certain some zone; Set the wall thickness of current location according to the change of the position signalling of storing electronic ruler, and extrude after the cycle accomplishes at a type embryo, carry out certain time-delay after; Carry out next cycle, promptly carry out the production of next type embryo.Through this mode selecting unit can the thick control of setting type germ wall system control model.
The executing agency of the thick control of the medium-sized germ wall of the application embodiment system is an electrohydraulic servo system, and said electrohydraulic servo system is a kind of feedback control system of being made up of electric signal process unit and hydraulic power mechanism.Concrete, this electrohydraulic servo system is the voltage location servo-drive system, comprises proportional servo valve and hydraulic jack; Wherein, Said proportional servo valve receives the signal of telecommunication, the signal of telecommunication is amplified the hydraulic pressure that changes hydraulic jack into can export, and the control signal of said gamma controller output offers said proportional servo valve; The position of proportional servo valve control hydraulic jack inner carrier; Thereby change the core rod gap width, so that the difference between core rod gap width and the thick setting value of said type germ wall finally makes the thick setting value of the thick following-up type rapidly and accurately of type germ wall germ wall in preset range.
Proportional servo valve has stronger anti-sticking ability, and the Electromagnetically-operating force rate of proportional servo valve guide controlled stage in the past the pilot operated power of electro-control converter commonly used improved manyfold.
The moving-iron type structure that the pilot stage of proportional servo valve adopts, so the wiring of taking of its solenoid can not fracture because of the action of electromagnetic core or come off, thus improved reliability.Therefore the reliability of the thick control of the type germ wall system that provides of the application embodiment is high.
Need to prove; In this article; Relational terms such as first and second grades only is used for an entity or operation are made a distinction with another entity or operation, and not necessarily requires or hint relation or the order that has any this reality between these entities or the operation.
The above only is the application's the specific embodiment; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the application's principle; Can also make some improvement and retouching, these improvement and retouching also should be regarded as the application's protection domain.
Claims (6)
1. the thick control of a type germ wall system is characterized in that, comprising: gamma controller, Linear displacement transducer and executing agency, wherein,
Said Linear displacement transducer is used to measure said core rod gap width, and feeds back to said gamma controller as the thick value of feedback of type germ wall;
The inquiry of said gamma controller is cut apart the thick axial distribution curve of type germ wall that interpolation method obtains by Bezier, obtains the thick setting value of type germ wall this moment, and relatively thick setting value of this type germ wall and the thick value of feedback of said type germ wall, the output control signal corresponding;
Said executing agency links to each other with said gamma controller, is used for according to the said control signal that receives, controls difference between thick value of feedback of said type germ wall and the thick setting value of said type germ wall in preset range.
2. system according to claim 1; It is characterized in that; Said gamma controller is non-linear ratio-derivative controller, comprising: wall thickness axial distribution curved unit, proportional controller, first wave filter, derivative controller and amplitude limit output unit, wherein:
Said wall thickness axial distribution curved unit, the wall thickness setting value that is used to store said type embryo;
Said proportional controller carries out scale operation to the wall thickness setting value of said type embryo and the difference between the thick value of feedback of said type germ wall, obtains the thick error of said type germ wall;
Said first wave filter is used for the thick value of feedback of said type germ wall that receives is carried out high-pass filtering, obtains the thick value of feedback of type germ wall after the high-pass filtering, and offers said derivative controller;
Said derivative controller is used for the thick value of feedback of type germ wall after the said high-pass filtering is differentiated, and obtains the thick value of feedback of the first type germ wall, and superposes with the thick error of said type germ wall, controlled information, and offer said amplitude limit output unit;
Said amplitude limit output unit is used for producing the control signal of amplitude in preset range according to the said control information that receives.
3. system according to claim 2 is characterized in that said gamma controller also comprises second wave filter, is used for the interfering signal of the thick value of feedback of the said type germ wall of filtering.
4. system according to claim 2 is characterized in that, said gamma controller also comprises:
With the mode selecting unit that the thick distribution curve of said type germ wall unit links to each other, be used to select the mode of operation of the thick control of said type germ wall system, this mode of operation comprises: continous way wall thickness control model and storing type wall thickness control model.
5. system according to claim 1 is characterized in that, said executing agency is an electrohydraulic servo system, and said electrohydraulic servo system comprises: proportional servo valve and hydraulic jack, wherein:
Said proportional servo valve receives the control signal of said gamma controller output, controls the position of piston in the said hydraulic jack, so that the difference between core rod gap width and the thick setting value of said type germ wall is in preset range.
6. system according to claim 1 is characterized in that, said gamma controller is a programmable logic controller (PLC).
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| CN201120552225XU CN202399510U (en) | 2011-12-26 | 2011-12-26 | System for controlling wall thickness of parison |
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| CN201120552225XU CN202399510U (en) | 2011-12-26 | 2011-12-26 | System for controlling wall thickness of parison |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102490349A (en) * | 2011-12-26 | 2012-06-13 | 宁波弘讯科技股份有限公司 | Parison wall thickness controlling system and method |
| CN114986854A (en) * | 2022-07-14 | 2022-09-02 | 宁波弘讯科技股份有限公司 | Wall thickness control method for material storage cylinder type wall thickness controller of blow molding machine |
-
2011
- 2011-12-26 CN CN201120552225XU patent/CN202399510U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102490349A (en) * | 2011-12-26 | 2012-06-13 | 宁波弘讯科技股份有限公司 | Parison wall thickness controlling system and method |
| CN114986854A (en) * | 2022-07-14 | 2022-09-02 | 宁波弘讯科技股份有限公司 | Wall thickness control method for material storage cylinder type wall thickness controller of blow molding machine |
| CN114986854B (en) * | 2022-07-14 | 2024-01-30 | 宁波弘讯科技股份有限公司 | Wall thickness control method for storage cylinder type wall thickness controller of blow molding machine |
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