CN105313286A - Point electrode capacitive sensor and injection molding machine employing same - Google Patents
Point electrode capacitive sensor and injection molding machine employing same Download PDFInfo
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- CN105313286A CN105313286A CN201510791193.1A CN201510791193A CN105313286A CN 105313286 A CN105313286 A CN 105313286A CN 201510791193 A CN201510791193 A CN 201510791193A CN 105313286 A CN105313286 A CN 105313286A
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- point electrode
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- capacitance sensor
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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
-
- 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
- B29C2945/76257—Mould cavity
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The invention discloses a point electrode capacitive sensor and an injection molding machine employing the same. The sensor comprises a point electrode capacitor and a capacitance measuring unit connected with the point electrode capacitor. The two poles of the point electrode capacitor are a point electrode and a metal electrode, and the point electrode and the metal electrode are arranged on a static mold body and a movable mold body of a mold respectively and are both connected with the capacitance measuring unit. According to the point electrode capacitive sensor, the point electrode capacitor with the two poles arranged on the static mold body and the movable mold body of the mold respectively is adopted, the point electrode capacitor is not influenced by the surface structure of a mold cavity, the point electrode capacitive sensor can be mounted in the mold cavity, with the complex surface structure, of the mold, flexibility is high, and adaptability is high. The point electrode capacitive sensor and the injection molding machine employing the same can be widely applied to the field of injection molding.
Description
Technical field
The present invention relates to injection molding art, especially a kind of point electrode capacitance sensor and apply the injection machine of this sensor.
Background technology
In polymer shaping process, particularly injection moulding process, On-line sampling system or the state of detection macromolecule melt in injection mold, have vital effect for the detection of whole injection moulding process and the prediction of end product quality.
In traditional injection moulding process, the condition detection method of melt in injection mold mainly comprises:
1), by its dependent variables such as measurement mode cavity pressure, cavity surface temperatures indirectly infer the state melt in mould, but the method operates easy not.
2), mounting glass die cavity in a mold, by high speed camera shooting macromolecule melt state in a mold.This method provide good experiment information, but due to melt completely different in the movable pole point process on used the in the industry metal die surface of glass surface and its, the method cannot be applied in industry, and range of application is less.
3), detect by ultrasonic pulse reflection method the state that melt flows in a mold.The method detects the position of flowing in a mold melt front end according to macromolecule and air to hyperacoustic differential declines degree.In a mold, install multiple sensor, when melt front end flow to the installation site of sensor, the amplitude that ultrasonic pulse reflects changes immediately, obtains the position that melt flows in a mold thus.But the position that the method can only be installed at sensor detects the front end of melt, the information of that can only provide interruption or discrete melt flows state is not accurate enough.
In order to overcome above defect, someone proposes and adopts the method for flat capacitance sensor (by plate condenser and corresponding capacitance measurement circuit) to detect the state of melt in injection mold.But the two poles of the earth of the method middle plateform capacitor are difficult to be arranged in the mould cavity (mould cavity as nonplanar structure) of surface texture complexity, and flexibility ratio is lower and applicability is narrower.
Summary of the invention
In order to solve the problems of the technologies described above, the object of the invention is: the point electrode capacitance sensor that a kind of flexibility ratio is higher and applicability is wider is provided.
Another object of the present invention is: provide a kind of flexibility ratio higher wider with applicability, the injection machine of point of application electrode capacitance sensor.
The technical solution adopted for the present invention to solve the technical problems is:
Point electrode capacitance sensor, the capacitance measurement unit comprising point electrode capacitor and be connected with point electrode capacitor, two of described point electrode capacitor very sets up point electrode on the quiet mould of mould and dynamic model and metal electrode separately, and described point electrode is all connected with capacitance measurement unit with metal electrode.
Further, described point electrode is arranged on the thimble of mould dynamic model, and described metal electrode is arranged on the quiet mould of mould.
Further, described point electrode is arranged on the quiet mould of mould, and described metal electrode is arranged on the dynamic model of mould.
Further, also comprise nested and helical bolt, in described point electrode, the top of the shaft shoulder coordinates with the locating hole of mould the location realizing upward direction, and in described point electrode, the bottom of the shaft shoulder is by nested coordinating with helical bolt, realization location in downward direction.
Further, in described point electrode, the bottom of the shaft shoulder is also provided with the wiring hole be connected with capacitance measurement unit.
Further, described point electrode with nested between be also provided with insulating barrier.
Further, described capacitance measurement unit comprises capacitance-voltage conversion circuit, analog-digital converter and acquisition module, described point electrode is all connected with capacitance-voltage conversion circuit with metal electrode, and the output of described capacitance-voltage conversion circuit is by analog-digital converter and then be connected with the input of acquisition module.
Further, described point electrode and metal electrode are divided into the both sides of mould cavity.
The present invention solves another technical scheme that its technical problem adopts:
The injection machine of point of application electrode capacitance sensor, comprises point electrode capacitance sensor and control system for shot machine, and described point electrode capacitance sensor is arranged in mould, and the described output of point electrode capacitance sensor is connected with the input of control system for shot machine.
The beneficial effect of point electrode capacitance sensor of the present invention is: have employed the two poles of the earth divide be located at mould dynamic model and quiet mould on point electrode capacitor arrangement, not by the impact of cavity surface structure, make point electrode capacitance sensor can be arranged in the mould cavity of surface texture complexity, flexibility ratio is higher and adaptability is wider.Further, directly utilize thimble as point electrode, do not need to change mould structure, convenient and be generally suitable for.Further, also comprise nested and helical bolt, point electrode realizes the location of point electrode by the shaft shoulder with working in coordination between nested, helical bolt, makes point electrode ensure that pole plate does not enter die cavity at the pressure bearing plastics in die cavity, more simultaneously.
The beneficial effect of injection machine of the present invention is: have employed the point electrode capacitor arrangement be arranged in mould and detect to carry out melt state in mould, not by the impact of cavity surface structure, make point electrode capacitance sensor can be arranged in the mould cavity of surface texture complexity, flexibility ratio is higher and adaptability is wider.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 is the overall structure figure of point electrode capacitance sensor of the present invention;
Fig. 2 is the structural representation of injection machine of the present invention;
Fig. 3 is the structural representation of the embodiment of the present invention one mid point electrode capacitance sensor;
Fig. 4 is the circuit structure block diagram of capacitance measurement unit of the present invention.
Reference numeral: 1, point electrode; 2, insulating barrier; 3, nested; 4, helical bolt; 5, wiring hole; 6, the shaft shoulder; 7 and 10, quiet mould; 8, die cavity; 9, dynamic model; 11, cast gate; 12, heating collar; 13, screw rod; 14, object is measured; 15, earth electrode.
Detailed description of the invention
With reference to Fig. 1, point electrode capacitance sensor, the capacitance measurement unit comprising point electrode capacitor and be connected with point electrode capacitor, two of described point electrode capacitor very sets up point electrode 1 on the quiet mould 7 of mould and dynamic model and metal electrode separately, and described point electrode 1 is all connected with capacitance measurement unit with metal electrode.
Be further used as preferred embodiment, described point electrode 1 is arranged on the thimble of mould dynamic model, and described metal electrode is arranged on the quiet mould 7 of mould.
The present invention can, by (such as adding insulating barrier) after thimble is carried out particular design, directly utilize thimble as point electrode.In this case, point electrode is exactly that now corresponding with point electrode metal electrode is exactly directly metal surface corresponding to mould, namely corresponding with part in point electrode insulating barrier area on the dynamic model of mould (because thimble is all generally) on dynamic model.The benefit of this design does not need to change (because each mould necessarily have thimble) to mould, very convenient and be easy to realize.
With reference to Fig. 1, be further used as preferred embodiment, described point electrode 1 is arranged on the quiet mould 7 of mould, and described metal electrode is arranged on the dynamic model of mould.
Point electrode also can be installed on the quiet mould of mould by the present invention, and the holding wire that point electrode is drawn does not need with the variation of mould dynamic model and changes, to make the signal obtained more stable.
With reference to Fig. 1, be further used as preferred embodiment, also comprise nested 3 and helical bolt 4, in described point electrode 1, the top of the shaft shoulder 6 coordinates with the locating hole of mould the location realizing upward direction, in described point electrode 1 shaft shoulder 6 bottom by nested 3 with the coordinating of helical bolt 4, realize location in downward direction.
With reference to Fig. 1, be further used as preferred embodiment, in described point electrode 1, the bottom of the shaft shoulder 6 is also provided with the wiring hole 5 be connected with capacitance measurement unit.
With reference to Fig. 1, be further used as preferred embodiment, between described point electrode 1 is with nested 3, is also provided with insulating barrier 2.
With reference to Fig. 4, be further used as preferred embodiment, described capacitance measurement unit comprises capacitance-voltage conversion circuit, analog-digital converter and acquisition module, described point electrode 1 is all connected with capacitance-voltage conversion circuit with metal electrode, and the output of described capacitance-voltage conversion circuit is by analog-digital converter and then be connected with the input of acquisition module.
Be further used as preferred embodiment, described point electrode 1 and metal electrode are divided into the both sides of mould cavity 8.
With reference to Fig. 2, the injection machine of point of application electrode capacitance sensor, comprise point electrode capacitance sensor and control system for shot machine, described point electrode capacitance sensor is arranged in mould, and the described output of point electrode capacitance sensor is connected with the input of control system for shot machine.
Be further used as preferred embodiment, described point electrode capacitance sensor is point electrode capacitance sensor as shown in figs. 1 and 4.
Below in conjunction with Figure of description and specific embodiment, the present invention is described in further detail.
Embodiment one
With reference to Fig. 3, the first embodiment of the present invention:
In order to solve the demand of the on-line measurement of the product (such as phone housing) based on writing board shape, someone designs and has processed plate capacitance sensor at present.This capacitance sensor utilizes the plastic melt state be arranged in two flat pole perception die cavitys of die cavity both sides.Experimental result finds that plate capacitor can the correct materials behavior of the plate plastic product of on-line measurement in die cavity effectively, but plate capacitor cannot be arranged in the baroque plastic product mould of cavity surface.Based on this demand, the present invention devises the on-line measurement problem that a kind of novel point electrode capacitance sensor solves complex surface plastic product.
Point-type sensor of the present invention both can play the effect of plate capacitance sensor by the form of array, also can rational deployment in the mould of non-planar surfaces structure, applicability is wider.Capacitance sensor plate designs of the present invention is single point shape (being generally 3 ~ 6mm circular), can by the key point place of difference layout at injection moulding process such as glue-feeder, last filling position, last cool position.Battery lead plate, by Anti-interference cable, is connected to measured capacitance value unit by socket, thus measures the change of injection moulding process key point place material capacitance, and through Modling model and data analysis, reach the object finding out procedural information by point electrode capacitor.
The instrumentation plan of point electrode capacitor of the present invention as shown in Figure 3, forms capacitor between point electrode and grounding electrode plate.When tested plastic melt is placed between above-mentioned two electrodes, melt replaces air dielectric as medium and causes capacitance to raise, and the factor such as materials behavior, thickness, mold temperature of melt also can affect the change of capacitance in injection moulding process in addition.Therefore, the application of this configuration just can be monitored real-time procedural information by Real-Time Monitoring capacitance in a mold.Two electrodes of point electrode capacitor are contained in the two halves of mould respectively, and (half is quiet mould, and half is dynamic model, as shown in Figure 3.In the process that mould is closed, quiet mould is motionless, and dynamic model closes to quiet mould direction, and this two metallic plate is mutually isolated simultaneously), thus form two cube 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 only devises 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 3, one piece of corrosion resistant plate is arranged in dynamic model, forms a pole of plate condenser, comprises the quiet mould part of point electrode without any need for amendment simultaneously, forms an other pole of point electrode capacitor.
And consider for the position relationship of the little feature of point electrode size and thimble and mould, point electrode sensor of the present invention also can be designed to the shape identical with thimble and replace thimble, is arranged on the quiet mould of mould on the thimble being arranged on mould dynamic model and by metal electrode by point electrode.Such design can be formed by existing equipment quick transformation, does not need to change existing mould structure, only thimble need be carried out improving just can realize, avoid other processing mounting holes on mould, convenient and be generally suitable for.
Embodiment two
With reference to Fig. 1, the second embodiment of the present invention:
For the consideration of reliability, the capacitance sensor of the present embodiment divides three parts, is respectively point electrode, nested and helical bolt.The design of point electrode needs to consider its working environment.In a mold, point electrode should bear the pressure from plastics in die cavity, must ensure that again its pole plate does not enter die cavity, to avoid the impact on product quality.Therefore, point electrode plate needs to realize location in the two directions.As shown in Figure 1, the location of the present invention to point electrode is realized by the shaft shoulder, and shaft shoulder top coordinates with the locating hole of mould the location realizing upward direction; The bottom of the shaft shoulder then with nested arrangements, then to be coordinated with quiet mould mould by screw thread by helical bolt, realize location in downward direction.
Point electrode, nested, screwed plug three are designed to the structure cooperatively interacted by the present invention, realize point electrode capacitance sensor location in a mold and assembling.Point electrode relies on nested realization to locate with coordinating of bolt, to be fixed in quiet mould, and by the plastic state information in its surface induction mould.
Point electrode capacitance sensor needs when being installed on mould to process (as boring etc.) mould, and in order to make its better adaptability and cost-saving, also the part that mould changes can be made quiet mould module, remainder all makes identical structure.Like this for different products, when it needs to carry out different sensing station layouts, only need to process different quiet mould module, then by quiet mould module assembly in the groove of mould, significantly reduce producing cost and improve the applicability of mould.
Embodiment three
With reference to Fig. 1, the third embodiment of the present invention:
For forming a capacitor, the two poles of the earth of point electrode capacitor must be mutually isolated.The present embodiment uses electrical insulator to come other positions of isolating points electrode and mould, and electrical insulator adopts the method for spray aluminum oxide insulated paint to make.But find in an experiment, the spray layer thickness of insulated paint and machining accuracy are difficult to control, and can cause the point electrode external diameter of the sensor after spray applied insulation cannot be good fit with quiet nib footpath, easily occur the situation of matched in clearance or interference fit.In addition, in order to realize better insulation effect, need the thickness increasing insulating barrier.But easily there is the situation that insulated paint peels off in the increase of thickness, can not ensure the durability of sensor.
Based on considering of above factor, the insulating barrier of the present embodiment have employed more advanced blasting craft and silica glass material.Sandblasting is mainly used in carrying out surface treatment to material, makes other coating be adsorbed on material surface better.Sandblasting adopt compressed air be power, by travel high-speed spray beam by material spray high velocity jet to be processed surface of the work.Compared with spraying coating process, the dimensioned precision of blasting craft is higher, and surface quality is better.And silex glass is compared aluminium oxide and is had better insulating properties.Therefore, adopt the insulating barrier of blasting craft and silex glass insulating materials to have higher machining accuracy and better insulation effect, the thickness of insulating materials is generally about 0.2mm.
Embodiment four
With reference to Fig. 1,2 and Fig. 4, the fourth embodiment of the present invention:
Compared with existing injection machine, injection machine of the present invention mainly adds point electrode capacitance sensor, and the point electrode of this point electrode capacitance sensor can by the key point place of difference layout at injection moulding process such as glue-feeder, last filling position, last cool position.Point electrode of the present invention be connected to measured capacitance value unit by Anti-interference cable and socket, thus in real time measure the change of injection moulding process key point place material capacitance, to reflect the state of melt in mould.
As shown in Figure 4, capacitance measurement unit of the present invention forms primarily of three parts, wherein, the capacitance of capacitance-voltage modular converter to point electrode capacitor measure and capacitance is converted into analog voltage export, and output voltage and capacitance linear; The analog voltage of output is converted into digital quantity by the analog-to-digital conversion module of capacitance measurement unit; The acquisition module of capacitance measurement unit gathers the digital quantity that capacitance measurement unit exports and feeds back to control system for shot machine.Control system for shot machine gathers the digital quantity do not obtained in the same time and records and can obtain voltage-time curve.Because the voltage-time curve obtained intuitively reflects the state situation of change of melt in mould, therefore can learn when the state in front mold residing for melt by analyzing this curve.
Compared with prior art, the present invention has the following advantages:
(1) have employed the two poles of the earth divide be located at mould dynamic model and quiet mould on point electrode capacitor arrangement, not by the impact of cavity surface structure, make point electrode capacitance sensor can be arranged in the mould cavity of surface texture complexity, flexibility ratio is higher and adaptability is wider;
(2) directly utilize thimble as point electrode, do not need to change mould structure, convenient and be generally suitable for;
(3) point electrode capacitor also comprises nested and helical bolt, point electrode realizes the location of point electrode by the shaft shoulder with working in coordination between nested, helical bolt, make point electrode ensure that pole plate does not enter die cavity at the pressure bearing plastics in die cavity, more simultaneously.
More than that better enforcement of the present invention is illustrated, but the invention is not limited to described embodiment, those of ordinary skill in the art also can make all equivalent variations or replacement under the prerequisite without prejudice to spirit of the present invention, and these equivalent distortion or replacement are all included in the application's claim limited range.
Claims (10)
1. point electrode capacitance sensor, is characterized in that: comprise point electrode capacitor and be connected with point electrode capacitor
Capacitance measurement unit, two of described point electrode capacitor very sets up point electrode (1) on the quiet mould of mould (7) and dynamic model and metal electrode separately, and described point electrode (1) is all connected with capacitance measurement unit with metal electrode.
2. point electrode capacitance sensor according to claim 1, is characterized in that: described point electrode (1) is established
Put on the thimble of mould dynamic model, described metal electrode is arranged on the quiet mould (7) of mould.
3. point electrode capacitance sensor according to claim 1, is characterized in that: described point electrode (1) is established
Put on the quiet mould (7) of mould, described metal electrode is arranged on the dynamic model of mould.
4. point electrode capacitance sensor according to claim 3, is characterized in that: also comprise nested (3) and
Helical bolt (4), in described point electrode (1), the top of the shaft shoulder (6) coordinates with the locating hole of mould the location realizing upward direction, bottom the coordinating by nested (3) and helical bolt (4) of the shaft shoulder (6) in described point electrode (1), realization location in downward direction.
5. point electrode capacitance sensor according to claim 4, is characterized in that: in described point electrode (1)
The bottom of the shaft shoulder (6) is also provided with the wiring hole (5) be connected with capacitance measurement unit.
6. point electrode capacitance sensor according to claim 4, is characterized in that: in described point electrode (1)
Insulating barrier (2) is also provided with between nested (3).
7. point electrode capacitance sensor according to claim 1, is characterized in that: described capacitance measurement unit
Comprise capacitance-voltage conversion circuit, analog-digital converter and acquisition module, described point electrode (1) is all connected with capacitance-voltage conversion circuit with metal electrode, and the output of described capacitance-voltage conversion circuit is by analog-digital converter and then be connected with the input of acquisition module.
8. point electrode capacitance sensor according to claim 1, is characterized in that: described point electrode (1) and
Metal electrode is divided into the both sides of mould cavity (8).
9. the injection machine of point of application electrode capacitance sensor, is characterized in that: comprise point electrode capacitance sensor and note
Molding machine control system, described point electrode capacitance sensor is arranged in mould, and the described output of point electrode capacitance sensor is connected with the input of control system for shot machine.
10. the injection machine of point of application electrode capacitance sensor according to claim 9, is characterized in that: described in
Point electrode capacitance sensor is the point electrode capacitance sensor as described in any one of claim 1-8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510791193.1A CN105313286B (en) | 2015-11-10 | 2015-11-17 | The injection machine of point electrode capacitance sensor and the application sensor |
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| CN201510762266 | 2015-11-10 | ||
| CN2015107622664 | 2015-11-10 | ||
| CN201510791193.1A CN105313286B (en) | 2015-11-10 | 2015-11-17 | The injection machine of point electrode capacitance sensor and the application sensor |
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| CN105313286A true CN105313286A (en) | 2016-02-10 |
| CN105313286B CN105313286B (en) | 2017-10-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105563784A (en) * | 2016-02-18 | 2016-05-11 | 群达模具(深圳)有限公司 | Injection mold sensor and manufacturing method of sensing components thereof |
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| JPH05237894A (en) * | 1992-02-26 | 1993-09-17 | Hitachi Ltd | Method and apparatus for molding substrate for data recording medium |
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