CN105328886B - Melt state sensory perceptual system and its detection method in injection mold based on point electrode - Google Patents
Melt state sensory perceptual system and its detection method in injection mold based on point electrode Download PDFInfo
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- CN105328886B CN105328886B CN201510762903.8A CN201510762903A CN105328886B CN 105328886 B CN105328886 B CN 105328886B CN 201510762903 A CN201510762903 A CN 201510762903A CN 105328886 B CN105328886 B CN 105328886B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76003—Measured parameter
- B29C2945/76033—Electric current or voltage
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76003—Measured parameter
- B29C2945/76066—Time
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76177—Location of measurement
- B29C2945/76254—Mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76451—Measurement means
- B29C2945/76454—Electrical, e.g. thermocouples
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses melt state sensory perceptual system and its detection method in a kind of injection mold based on point electrode, system includes point electrode capacitor sensor and state recognition system, the point electrode capacitor sensor includes point electrode capacitor and capacitance measurement unit, two electrodes of the point electrode capacitor are located at the inner side of mould dynamic model and quiet mould respectively, two electrodes of the point electrode capacitor are connected with capacitance measurement unit, and the output end of the capacitance measurement unit and the input of state recognition system are connected.The system of the present invention employs the point electrode capacitor arrangement that two electrodes are located at the inner side of mould dynamic model and quiet mould respectively, do not influenceed by cavity surface structure, so that point electrode capacitor sensor may be mounted in the complicated mould cavity of surface texture, flexibility ratio is higher and adaptability is wider.It the composite can be widely applied to injection molding art.
Description
Technical field
The present invention relates to injection molding art, in especially a kind of injection mold based on point electrode melt state sensory perceptual system and
Its detection method.
Background technology
During polymer shaping, particularly injection moulding process, On-line sampling system or detection macromolecule melt are in note
State in mould, the prediction of detection and end product quality for whole injection moulding process has vital effect.
Condition detection method of the melt in injection mold mainly includes in traditional injection moulding process：
1）, by measuring its dependent variable such as cavity pressure, cavity surface temperature deduce the shape of melt in mould indirectly
State, but this method operate it is not enough easy.
2）, glass die cavity is installed in a mold, pass through high speed camera and shoot macromolecule melt state in a mold.The party
Method provides preferable experiment information, but is due to melt in glass surface and its used metal die surface in the industry
Flowing and diabatic process it is entirely different, this method can not be applied in industry, and application is smaller.
3）, the state that melt flows in a mold is detected by ultrasonic pulse reflection method.This method according to macromolecule and
Air detects the position that melt front end is flowed in a mold to the differential declines degree of ultrasonic wave.In a mold, multiple pass is installed
Sensor, when melt front end flow to the installation site of sensor, the amplitude that ultrasonic pulse is reflected changes immediately, by
This obtains the position that melt flows in a mold.But, before this method can only detect melt in the position that sensor is installed
End, can only provide the information of interruption or discrete melt flows state, not accurate enough.
In order to overcome disadvantages described above, it is thus proposed that use flat capacitance sensor（By plate condenser and corresponding electricity
Capacitance measuring circuit is constituted）Method detect state of the melt in injection mold.The capacitance sensor utilizes the type of being arranged on
Two flat poles of chamber both sides perceive the plastic melt state in die cavity.Experimental result finds that plate capacitor can be just
True effectively materials behavior of the plate plastic product of on-line measurement in die cavity, but the two of this method middle plateform capacitor are extremely difficult
With installed in the complicated mould of surface texture（Such as the mould of nonplanar structure）Interior, flexibility ratio is relatively low and applicability is narrower.
The content of the invention
In order to solve the above-mentioned technical problem, the purpose of the present invention is：There is provided that a kind of flexibility ratio is higher and applicability is wider,
Melt state sensory perceptual system in injection mold based on point electrode.
It is another object of the present invention to：There is provided that a kind of flexibility ratio is higher and applicability is wider, the injection based on point electrode
Melt state detection method in mould.
The technical solution adopted for the present invention to solve the technical problems is：
Melt state sensory perceptual system in injection mold based on point electrode, including point electrode capacitor sensor and state are known
Other system, the point electrode capacitor sensor includes point electrode capacitor and capacitance measurement unit, the point electrode capacitor
Two electrodes be located at the inner side of mould dynamic model and quiet mould respectively, two electrodes of the point electrode capacitor are and capacitance measurement
Unit is connected, and the output end of the capacitance measurement unit and the input of state recognition system are connected.
Further, the one of the point electrode capacitor is extremely arranged on the point electrode in the quiet mould of mould, the point electrode electricity
Another metal electrode being extremely arranged on mould dynamic model of container, the point electrode and metal electrode are and capacitance measurement unit
Connection.
Further, the electrode capacitor sensor also includes the top of the shaft shoulder in nested and helical bolt, the point electrode
The bottom of the shaft shoulder in the positioning for realizing upward direction, the point electrode is coordinated to pass through nested and helical bolt with the positioning hole of mould
Coordinate, realize positioning in downward direction.
Further, the bottom of the shaft shoulder is additionally provided with the wiring hole being connected with capacitance measurement unit in the point electrode.
Further, the point electrode with it is nested between be additionally provided with insulating barrier.
Further, the capacitance measurement unit includes capacitance-voltage conversion circuit, analog-digital converter and acquisition module, described
Point electrode and metal electrode are connected with capacitance-voltage conversion circuit, and the output end of the capacitance-voltage conversion circuit passes through modulus
Converter and then it is connected with the input of acquisition module.
Further, the one of the point electrode capacitor is extremely arranged on the point electrode on mould dynamic model thimble, the point electricity
Another metal electrode being extremely arranged on the quiet mould of mould of electrode capacitor, the point electrode and metal electrode are and capacitance measurement
Unit is connected.
The present invention solves another technical scheme for being used of its technical problem：
Melt state detection method in injection mold based on point electrode, including：
S1, the point electrode of point electrode capacitance sensor is arranged at the key point of injection moulding process, and by point electrode electric capacity
Sensor is connected by capacitance measurement unit with state recognition system, wherein, the key point of injection moulding process is in mould；
S2, according to the timing of default sampling period the output voltage of point electrode capacitance sensor is acquired；
S3, the output voltage according to collection and collection moment carry out state recognition, so as to detect melt in injection mold
State.
Further, the key point of the injection moulding process is the glue-feeder, last filling position or last cooling of injection moulding process
Position.
The beneficial effect of system of the present invention is：Two electrodes are employed respectively positioned at the both sides of mould dynamic model and quiet mould
Point electrode capacitor arrangement, is not influenceed by cavity surface structure so that point electrode capacitor sensor may be mounted at surface
In baroque mould cavity, flexibility ratio is higher and adaptability is wider.Further, point electrode capacitor sensor includes point electricity
Pole, nesting and helical bolt, point electrode realize the positioning of point electrode by working in coordination between the shaft shoulder and nested, helical bolt,
So that point electrode is bearing the pressure of plastics in die cavity while ensureing that pole plate is introduced into die cavity, it is relatively reliable.Further, it is directly sharp
Point electrode is used as with thimble, it is not necessary to which mould structure is modified, more facilitate and be generally applicable.
The beneficial effects of the method for the present invention is：The point electrode of point electrode capacitance sensor need to be only arranged in mould
At injection moulding process key point, and conjunction measuring unit and state recognition system just can complete the detection of melt state in mould, drop
Low influence of the mould cavity surface texture to mould state-detection process, so as to which point electrode capacitor sensor is installed
In the complicated mould cavity of surface texture, flexibility ratio is higher and adaptability is wider.
Brief description of the drawings
The invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is the functional block diagram of melt state sensory perceptual system in the injection mold of the invention based on point electrode；
Fig. 2 is the structural representation of point electrode capacitor sensor of the present invention；
Fig. 3 is melt state detection method in the injection mold of the invention based on point electrode；
Fig. 4 is the configuration diagram of some electrode capacitors of the embodiment of the present invention；
Fig. 5 is the structured flowchart of capacitance measurement unit of the present invention；
Fig. 6 is output voltage-time graph of the embodiment of the present invention two.
Reference：1st, point electrode；2nd, insulating barrier；3rd, it is nested；4th, helical bolt；5th, wiring hole；6th, the shaft shoulder；7th, quiet mould；8、
Die cavity；9th, object is measured；10th, grounding electrode.
Embodiment
Melt state sensory perceptual system in reference picture 1, the injection mold based on point electrode, including point electrode capacitor sensor
And state recognition system, the point electrode capacitor sensor includes point electrode capacitor and capacitance measurement unit, point electricity
Two electrodes of electrode capacitor are located at the inner side of mould dynamic model and quiet mould 7 respectively, and two electrodes of the point electrode capacitor are equal
It is connected with capacitance measurement unit, the output end of the capacitance measurement unit and the input of state recognition system are connected.
Reference picture 2, is further used as preferred embodiment, and the one of the point electrode capacitor to be extremely arranged on mould quiet
Point electrode 1 in mould 7, another metal electrode being extremely arranged on mould dynamic model of the point electrode capacitor 1, the point electricity
Pole 1 and metal electrode are connected with capacitance measurement unit.
Point electrode can be installed on the quiet mould of mould by the present invention, and the signal wire for drawing point electrode need not be with mould
The variation of dynamic model and change, with so that the signal arrived more stablize.
Reference picture 2, is further used as preferred embodiment, and the electrode capacitor sensor also includes nesting 3 and spiral shell
The positioning hole of the top of the shaft shoulder 6 and mould coordinates the positioning for realizing upward direction, the point electrode in line bolt 4, the point electrode 1
Positioning in downward direction is realized in the bottom of the shaft shoulder 6 by nesting 3 and the cooperation of helical bolt 4 in 1.
Reference picture 2, is further used as preferred embodiment, and the bottom of the shaft shoulder 6 is additionally provided with and electricity in the point electrode 1
Hold the wiring hole 5 of measuring unit connection.
It is further used as preferred embodiment, insulating barrier 2 being additionally provided between the point electrode 1 is with nested 3.
Reference picture 5, is further used as preferred embodiment, and the capacitance measurement unit includes convert of capacitor to voltage electricity
Road, analog-digital converter and acquisition module, the point electrode and metal electrode are connected with capacitance-voltage conversion circuit, the electric capacity
The output end of voltage conversion circuit is connected by analog-digital converter and then with the input of acquisition module.
It is further used as preferred embodiment, the one of the point electrode capacitor is extremely arranged on mould dynamic model thimble
Point electrode 1, another metal electrode being extremely arranged on the quiet mould 7 of mould of the point electrode capacitor, the He of point electrode 1
Metal electrode is connected with capacitance measurement unit.
The present invention can also be by the way that thimble be carried out after particular design（For example plus insulating barrier）, directly it is used as point by the use of thimble
Electrode.In this case, point electrode is exactly on the dynamic model of mould（Because thimble is typically all on dynamic model）, now with an electricity
Extremely corresponding metal electrode is directly exactly the corresponding metal surface of mould, i.e., area corresponding with part in point electrode insulating barrier.
The benefit of this design is that mould need not be modified（Because each mould necessarily has thimble）, it is very convenient and be easy to
Realize.
Melt state detection method in reference picture 3, the injection mold based on point electrode, including：
S1, the point electrode of point electrode capacitance sensor is arranged at the key point of injection moulding process, and by point electrode electric capacity
Sensor is connected by capacitance measurement unit with state recognition system, wherein, the key point of injection moulding process is in mould；
S2, according to the timing of default sampling period the output voltage of point electrode capacitance sensor is acquired；
S3, the output voltage according to collection and collection moment carry out state recognition, so as to detect melt in injection mold
State.
Be further used as preferred embodiment, the key point of the injection moulding process for injection moulding process glue-feeder, last
Filling position finally cools down position.
It is further used as preferred embodiment, the point electrode capacitor sensor is point electrode electricity as shown in Figure 2
Container sensor.
The present invention is described in further detail with reference to Figure of description and specific embodiment.
Embodiment one
Reference picture 1, Fig. 2, Fig. 4 and Fig. 5, the first embodiment of the present invention：
Melt state sensory perceptual system includes state recognition system and by an electricity in injection mold of the invention based on point electrode
The point electrode capacitance sensor of electrode capacitor, capacitance measurement unit composition.This two large divisions is introduced separately below.
（One）Point electrode capacitance sensor
In order to solve the product based on writing board shape（Such as phone housing）On-line measurement demand, had at present
People's design has processed plate capacitance sensor, but plate capacitor can not be arranged on the baroque modeling of cavity surface
Expect in product mold.Based on this demand, the present invention devises a kind of new point electrode capacitor sensor to solve complexity
The on-line measurement problem of surface plastic materials product.
The point-type sensor of the present invention both can play a part of plate capacitance sensor by the form of array, also may be used
With rational deployment in the mould of non-planar surfaces structure, applicability is wider.The capacitance sensor plate designs of the present invention are single
Point shape（Generally 3 ~ 6mm is circular）, can be laid out respectively in glue-feeder, finally last filling position, the injection such as cooling position
At the key point of process.
The point electrode capacitor sensor of the present invention includes point electrode capacitor and capacitance measurement unit.Wherein, point electrode
The measurement structural representation of capacitor is as shown in figure 4, constitute capacitor between point electrode and grounding electrode plate.When tested plastics are molten
When body is placed between above-mentioned two electrode, melt causes capacitance to raise as medium substitution air dielectric, in addition the material of melt
The factors such as state, thickness, mold temperature can also influence the change of capacitance in injection moulding process.Therefore, this configuration is applied in mould
Just real-time procedural information can be monitored in tool by monitoring capacitance in real time.Two metal electrodes of point electrode capacitor point
Not Zhuan mould two halves（Half is quiet mould, and half is dynamic model, as shown in Figure 4.During mould is closed, quiet mould is motionless,
Dynamic model is closed to quiet mould direction, while what this two metallic plate was mutually isolated）, so as to form two electrodes of capacitor.
In addition, because plate electrode and mould are all metal material, in order to reduce the complexity of design, the present invention is only designed
Point electrode, and another electrode of point electrode capacitor is then replaced by the dynamic model of access capacitance measurement unit.As shown in figure 4,
One piece of stainless steel plate is arranged in dynamic model, a pole of point electrode capacitor is formed, while the quiet mould part comprising point electrode is not required to
Any modification is wanted, an other pole for point electrode capacitor is formed.
For point electrode size the characteristics of small and the position relationship of thimble and mould considers, point electrode sensing of the invention
Device also is designed to replace thimble with thimble identical shape, i.e., point electrode is arranged on the thimble of mould dynamic model and by gold
Category electrode is arranged on the quiet mould of mould.Such design can be formed by existing equipment quick transformation, vary without existing mould
Thimble, only need to be improved and just can realize by lamps structure, it is to avoid the other processing mounting holes on mould, more facilitate and generally
It is applicable.
And the capacitance measurement unit of the present invention is then mainly made up of three parts, as shown in figure 5, wherein, capacitance-voltage conversion
Module measures to the capacitance of point electrode capacitor and capacitance is converted into analog voltage output, and output voltage and electricity
Capacitance is linear；The analog voltage of output is converted into digital quantity by the analog-to-digital conversion module of capacitance measurement unit；Electric capacity is surveyed
The digital quantity that the acquisition module of amount unit is exported to capacitance measurement unit is acquired and feeds back to state recognition system.
（Two）State recognition system
State recognition system is acquired and recorded in the digital quantity not exported in the same time to capacitance measurement unit, obtains defeated
Go out voltage-time curve, then the curve is analyzed, you can identify melt state in which in mould.
Embodiment two
Reference picture 2, the second embodiment of the present invention：
For the consideration of reliability, point electrode capacitance sensor of the invention divides three parts, respectively point electrode, embedding
Set and helical bolt.The design of point electrode needs to consider its working environment.In a mold, point electrode should bear to mould in die cavity
The pressure of material, must assure that its pole plate is introduced into die cavity again, to avoid the influence to product quality.Therefore, point electrode plate needs
Positioning is realized in the two directions.As shown in Fig. 2 positioning of the present invention to point electrode is realized by the shaft shoulder, shaft shoulder top and mould
Positioning hole coordinate and realize the positioning of upward direction；And the bottom of the shaft shoulder then with nested arrangements, then by helical bolt by screw thread with
Quiet mould mould coordinates, and realizes positioning in downward direction.
The structure that point electrode, nesting, screwed plug three are designed to cooperate by the present invention, realizes that point electrode capacitor is passed
The positioning and assembling of sensor in a mold.Point electrode is positioned by the nested cooperation realized with bolt, to be fixed on quiet mould
It is interior, and pass through the plastic state information in its surface induction mould.
Point electrode capacitor sensor needs to be processed mould when being installed on mould（Such as drill）, in order that its
Better adaptability and cost-effective, can also make the part changed on mould quiet mould module, remainder is all made identical
Structure.So for different products, when it needs to carry out different sensing station layouts, it is only necessary to which processing is different
Quiet mould module, then quiet mould module is assembled in the groove of mould, significantly reduces and producing cost and improves
The applicability of mould.
In order to form capacitor, the two poles of the earth of capacitor must be mutually isolated.The present invention carrys out isolating points electricity using electrical insulator
Other positions of pole and mould, point electrode with it is nested between be provided with insulating barrier.
Embodiment three
Reference picture 3 and Fig. 6, the third embodiment of the present invention：
The implementation process of melt state detection method is in injection mold of the invention based on point electrode：
（1）, the point electrode of point electrode capacitance sensor is arranged at the key point of injection moulding process, and by point electrode electric capacity
Sensor is connected by capacitance measurement unit with state recognition system, wherein, the key point of injection moulding process is in mould, and point is electric
Pole can be respectively laid out in glue-feeder, last filling position, finally be cooled down at the key point of the injection moulding process such as position；
（2）, state recognition system setting the sampling period and according to the sampling period timing output voltage is acquired；
（3）, state recognition system record collection output voltage and collection the moment, obtain corresponding output voltage-time
Curve；
（4）, state recognition system analyzed according to obtained state recognition system curve, draw in mould residing for melt
State.
Each state of one injection cycle is analyzed below according to the output voltage-time graph：
As shown in fig. 6, in matched moulds stage, dynamic model is drawn close to quiet mould, mould inner capacitor the two poles of the earth distance between plates shortens.The change
The capacitance of point electrode capacitor is caused gradually to increase；Because output voltage linearly changes with electric capacity, so capacitance measurement list
The magnitude of voltage of member output also accordingly increases, untill the relative distance between dynamic model and quiet mould no longer changes.In injection stage,
Because polymer dielectric constant is bigger than air, as macromolecule melt is gradually injected die cavity, the capacitance of mould inner capacitor also by
Cumulative big, the output voltage values of capacitance measurement unit also increase therewith；In packing stage, a small amount of melt be squeezed into die cavity with
Product shrinks caused by compensating melt cooling, and now the output voltage of capacitance measurement unit also mutually increases, but relative to injection rank
Section, increasing degree and speed of the output voltage in this stage becomes very slow.Accordingly, the voltage based on above procedure-
On time graph, the output characteristics in two above stage has very big difference, if electrode is arranged on die cavity by mould inner capacitor
Last filling point, then the switching time point in two above stage can be directly detected according to this output characteristics difference, is entered
And the machine Control system stage is switched in time, it is to avoid after causing die cavity discontented because of too early or too late switching or overcharge
Really.After pressurize terminates, injection moulding process enters cooling stage, and significant change does not occur for the capacitance of point electrode capacitor；
When product solidification is abundant, mould is opened, and the distance of the interpolar of electric capacity two becomes big suddenly, under causing capacitance and output voltage rapid
Drop.By the above method, state recognition system can clearly monitor the state in each stage of injection moulding process, and be injection machine
Central control system provides data and supported.
Example IV
The present embodiment is to melt state sensory perceptual system in injection mold of the present invention based on point electrode in Industry Control
Practical application is illustrated.
（1）By the present invention mould in melt state sensory perceptual system can determine injection stage to packing stage change when
Between point.
When die cavity is full of by melt, injection moulding process is switched to packing stage from injection stage.Moral is corresponded,
This time point（Inject pressurize switching point）, injection moulding process controls to be switched to the pressure of packing stage by the speed control of injection portion
Power is controlled.If switching is too early, it can cause to short, i.e., mould filling is discontented with；If switching late, it can cause to overcharge, i.e. melt
Overflow.Therefore at the accurate time point for determining injection pressurize switching in time, it is necessary successfully to be operated for injection moulding process.And
Melt state sensory perceptual system can be for detecting the injection pressurize switching time point in the mould of the present invention.The electricity of mould inner capacitor
Capacitance gradually increases with the injection of melt, after melt reaches the point electrode in mould, although capacitance continues to increase, its speed
Degree is very slow, as shown in fig. 6, injection stage and the increased speed difference of packing stage electric capacity are very big.Therefore, if by mould
End covering finally filled that point of die cavity of capacitor plate, then the time point of switching is just easy to by injection mold
The output of interior melt state sensory perceptual system is detected.
（2）By melt state sensory perceptual system in the mould of the present invention, on-line prediction product weight is online product weight control
System provides Fundamentals of Measurement.
The weight of product is that a crucial product quality represents item.It is typically only capable to measure in the case of offline, i.e.,
After product stripping.The sign of offline measurement simply afterwards, it is impossible to for realizing the on line real time control of product weight.Such as Fig. 6
Shown, the output of melt capacitance sensor increases gradually in injection stage with gradually flowing into for melt in mould, in pressurize rank
Section, output continues to increase, but is due to that this stage melt flows into the quantity and speed of die cavity compared to being significantly reduced in injection stage,
So gathering way for the output of sensor also substantially slows down.In the cast gate condensation of injection machine（Now melt can not be flowed into again
Die cavity）, flow into die cavity melt quantity reach that the output of melt sensor in highest, corresponding mould also reaches maximum.Pouring
Mount point electrode capacitance sensor at mouthful, can accurately perceive the capacitance variations at cast gate, and in gate solidification, electrode capacitance
The output of sensor is by the final weight of representative products well.Therefore, the output of this melt state sensory perceptual system of the invention
It can be used to detect and predict final products weight.In specific implementation process, first obtain the output of system before the injection and maximum is defeated
Variable quantity between going out, sets up the linear model of this variable quantity and product weight, then can on-line prediction product according to this model
Weight, controls product quality to provide the basis measured for line closed loop.
Above is the preferable implementation to the present invention is illustrated, but the invention is not limited to the implementation
Example, those skilled in the art can also make a variety of equivalent variations or replace on the premise of without prejudice to spirit of the invention
Change, these equivalent deformations or replacement are all contained in the application claim limited range.
Claims (7)
1. melt state sensory perceptual system in the injection mold based on point electrode, it is characterised in that：Including point electrode capacitor sensing
Device and state recognition system, the point electrode capacitor sensor include point electrode capacitor and capacitance measurement unit, the point
Two electrodes of electrode capacitor are located at mould dynamic model and quiet mould respectively（7）Inner side, two electricity of the point electrode capacitor
Extremely it is connected with capacitance measurement unit, the output end of the capacitance measurement unit and the input of state recognition system are connected；
The one of the point electrode capacitor is extremely arranged on the quiet mould of mould（7）Interior point electrode（1）, the point electrode capacitor
Another metal electrode being extremely arranged on mould dynamic model, the point electrode（1）Connect with metal electrode with capacitance measurement unit
Connect；
Or, the one of the point electrode capacitor is extremely arranged on the point electrode on mould dynamic model thimble（1）, the point electrode electricity
The another of container is extremely arranged on the quiet mould of mould（7）On metal electrode, the point electrode（1）Surveyed with metal electrode with electric capacity
Measure unit connection；
The point electrode（1）For 3~6mm circle.
2. melt state sensory perceptual system in the injection mold according to claim 1 based on point electrode, it is characterised in that：Institute
Stating point electrode capacitor sensor also includes nesting（3）With helical bolt（4）, the point electrode（1）The middle shaft shoulder（6）Top and mould
The positioning hole of tool coordinates the positioning for realizing upward direction, the point electrode（1）The middle shaft shoulder（6）Bottom pass through nesting（3）With spiral shell
Line bolt（4）Cooperation, realize positioning in downward direction.
3. melt state sensory perceptual system in the injection mold according to claim 2 based on point electrode, it is characterised in that：Institute
State point electrode（1）The middle shaft shoulder（6）Bottom be additionally provided with the wiring hole being connected with capacitance measurement unit（5）.
4. melt state sensory perceptual system in the injection mold according to claim 2 based on point electrode, it is characterised in that：
The point electrode（1）With it is nested（3）Between be additionally provided with insulating barrier（2）.
5. melt state sensory perceptual system in the injection mold according to claim 2 based on point electrode, it is characterised in that：Institute
Stating capacitance measurement unit includes capacitance-voltage conversion circuit, analog-digital converter and acquisition module, the point electrode（1）With metal electricity
Extremely it is connected with capacitance-voltage conversion circuit, the output end of the capacitance-voltage conversion circuit is by analog-digital converter and then with adopting
Collect the input connection of module.
6. melt state detection method in the injection mold based on point electrode, it is characterised in that：Including：
S1, the point electrode of point electrode capacitor sensor is arranged at the key point of injection moulding process, and by point electrode capacitor
Sensor is connected by capacitance measurement unit with state recognition system, wherein, the key point of injection moulding process is in mould；
S2, according to the timing of default sampling period the output voltage of point electrode capacitor sensor is acquired；
S3, the output voltage according to collection and collection moment carry out state recognition, so as to detect the shape of melt in injection mold
State；
The point electrode capacitor sensor is point electrode capacitor sensor as claimed in claim 1 or 2.
7. melt state detection method in the injection mold according to claim 6 based on point electrode, it is characterised in that：Institute
The key point of injection moulding process is stated for the glue-feeder of injection moulding process, last filling position or position is finally cooled down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510762903.8A CN105328886B (en) | 2015-11-10 | 2015-11-10 | Melt state sensory perceptual system and its detection method in injection mold based on point electrode |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510762903.8A CN105328886B (en) | 2015-11-10 | 2015-11-10 | Melt state sensory perceptual system and its detection method in injection mold based on point electrode |
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| Publication Number | Publication Date |
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| CN105328886A CN105328886A (en) | 2016-02-17 |
| CN105328886B true CN105328886B (en) | 2017-10-10 |
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| CN107589154A (en) * | 2016-07-08 | 2018-01-16 | 群达模具(深圳)有限公司 | Melt sensor and Mo Nei melt sensor-based systems in a kind of mould |
| CN107856265A (en) * | 2016-09-22 | 2018-03-30 | 群达模具(深圳)有限公司 | Split type sensor and injection mold in a kind of injection mold |
| CN107856252A (en) * | 2016-09-22 | 2018-03-30 | 群达模具(深圳)有限公司 | Integral sensor and injection mold in a kind of injection mold |
| CN109342514A (en) * | 2018-09-04 | 2019-02-15 | 东莞弗兰德通信科技有限公司 | The dielectric constant measurement method and device of dielectric plastic |
| CN114043694B (en) * | 2021-11-22 | 2024-03-19 | 广州市香港科大***研究院 | Weight prediction method of injection molding object, key parameter adjustment method and device |
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