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Melt state sensing system and detection method in injection mold based on point electrodes

An injection mold and state sensing technology, which is applied in the melt state sensing system and its detection field in the injection mold based on point electrodes, can solve the problems of difficult installation of plate capacitors, low flexibility, and narrow applicability, so as to reduce the impact, High flexibility and wide adaptability

Active Publication Date: 2017-10-10
GUANGZHOU HKUST FOK YING TUNG RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The experimental results found that the plate capacitor can accurately and effectively measure the material state of the plate plastic product in the mold cavity online, but the two poles of the plate capacitor are difficult to install in the mold with complex surface structure (such as the mold with non-planar structure) in this method. Less flexible and narrower applicability

Method used

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  • Melt state sensing system and detection method in injection mold based on point electrodes
  • Melt state sensing system and detection method in injection mold based on point electrodes
  • Melt state sensing system and detection method in injection mold based on point electrodes

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no. 1 example

[0052] The point electrode-based melt state perception system in the injection mold of the present invention includes a state identification system and a point electrode capacitance sensor composed of a point electrode capacitor and a capacitance measuring unit. The two parts are introduced respectively below.

[0053] (1) Point electrode capacitive sensor

[0054] In order to meet the needs of online measurement of flat-shaped products (such as mobile phone casings), some people have designed and processed flat-type capacitive sensors, but flat-type capacitors cannot be installed in plastic product molds with complex cavity surface structures. Based on this requirement, the present invention designs a novel point electrode capacitor sensor to solve the online measurement problem of complex surface plastic products.

[0055] The point sensor of the present invention can not only play the role of a flat plate capacitive sensor in the form of an array, but also can be rationall...

no. 2 example

[0064] For the sake of reliability, the point electrode capacitive sensor of the present invention is divided into three parts, which are respectively point electrodes, nests and bolts. The design of the point electrode needs to consider its working environment. In the mold, the point electrode must not only bear the pressure from the plastic in the mold cavity, but also must ensure that its electrode plate does not enter the mold cavity, so as to avoid affecting the product quality. Therefore, the point electrode plate needs to be positioned in two directions. Such as figure 2 As shown, the positioning of the point electrode in the present invention is realized by the shaft shoulder, and the upper part of the shaft shoulder cooperates with the positioning hole of the mold to realize the positioning in the upward direction; Mold fits to achieve positioning in the downward direction.

[0065] The present invention designs the point electrode, the nest and the threaded bolt ...

no. 3 example

[0070] The realization process of the method for detecting the state of the melt in the injection mold based on the point electrodes of the present invention is as follows:

[0071] (1) Install the point electrode of the point electrode capacitive sensor at the key point of the injection molding process, and connect the point electrode capacitive sensor with the state recognition system through the capacitance measurement unit, wherein the key point of the injection molding process is located in the mold, and the point electrode It can be arranged at the key points of the injection molding process, such as the glue inlet, the final filling position, and the final cooling position;

[0072] (2) The state recognition system sets the sampling period and regularly collects the output voltage according to the sampling period;

[0073] (3) The state recognition system records the collected output voltage and collection time, and obtains the corresponding output voltage-time curve; ...

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Abstract

The invention discloses a sensing system and a detecting method for the melt state in an injection mold based on point electrodes. The system comprises a point electrode capacitor sensor and a stage recognizing system. The point electrode capacitor sensor comprises a point electrode capacitor and a capacitance measuring unit. The two electrodes of the point electrode capacitor are located on the inner side of a movable mold body and the inner side of a static mold body of the mold respectively and are connected with the capacitance measuring unit, and the output end of the capacitance measuring unit is connected with the input end of the stage recognition system. According to the system, the point electrode capacitor structure that the two electrodes are located on the inner side of the movable mold body and the inner side of the static mold body of the mold respectively is adopted, the electrodes are free of the influence of the surface structure of a mold cavity, the point electrode capacitor sensor can be installed in a mold cavity with the complex surface structure, flexibility is high, and adaptability is wide. The sensing system and the detecting method can be widely applied to the injection molding field.

Description

technical field [0001] The invention relates to the field of injection molding, in particular to a point electrode-based melt state sensing system in an injection mold and a detection method thereof. Background technique [0002] In the polymer molding process, especially the injection molding process, online real-time measurement or detection of the state of the polymer melt in the injection mold plays a vital role in the detection of the entire injection molding process and the prediction of the final product quality. [0003] The state detection methods of the melt in the injection mold in the traditional injection molding process mainly include: [0004] 1) Indirectly infer the state of the melt in the mold by measuring other variables such as cavity pressure and cavity surface temperature, but this method is not easy to operate. [0005] 2) Install a glass cavity in the mold, and use a high-speed camera to take pictures of the state of the polymer melt in the mold. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C45/77
CPCB29C45/77B29C2945/76033B29C2945/76066B29C2945/76254B29C2945/76454
Inventor 何天一莫胜勇姚科高福荣
Owner GUANGZHOU HKUST FOK YING TUNG RES INST
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