Point electrode capacitance sensor and injection molding machine using the sensor

A point electrode and capacitor technology, applied in the field of injection molding machines, can solve the problems of low flexibility, narrow applicability, and difficulty in installing flat plate capacitors, and achieve the effect of high flexibility and wide adaptability

Active Publication Date: 2017-10-17
GUANGZHOU HKUST FOK YING TUNG RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this method, it is difficult to install the two poles of the plate capacitor in the mold cavity with complex surface structure (such as the mold cavity with non-planar structure), which has low flexibility and narrow applicability

Method used

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  • Point electrode capacitance sensor and injection molding machine using the sensor
  • Point electrode capacitance sensor and injection molding machine using the sensor
  • Point electrode capacitance sensor and injection molding machine using the sensor

Examples

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no. 1 example

[0044] 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-panel capacitive sensors. The capacitive sensor uses two flat electrodes installed on both sides of the cavity to sense the state of the plastic melt in the cavity. The experimental results show that the plate type capacitor can accurately and effectively measure the material state of the plate type plastic product in the mold cavity on-line, but the plate type capacitor cannot be installed in the plastic product mold with complex cavity surface structure. Based on this requirement, the present invention designs a novel point electrode capacitive sensor to solve the problem of online measurement of plastic products with complex surfaces.

[0045] 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 rationally arranged in a mold with ...

no. 2 example

[0051] For the sake of reliability, the capacitive sensor of this embodiment is divided into three parts, which are 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. like figure 1 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.

[0052] The invention designs the point electrode, nesting and threaded bolt into a structure that cooperates with each other, so...

no. 3 example

[0056] To form a capacitor, the two poles of a point electrode capacitor must be isolated from each other. In this embodiment, an electrical insulator is used to isolate the point electrodes from other parts of the mold, and the electrical insulator is made by spraying alumina insulating varnish. However, it was found in the experiment that the thickness and machining accuracy of the sprayed layer of insulating varnish are difficult to control, which will cause the outer diameter of the point electrode of the sensor after spraying the insulating layer to fail to match the aperture of the static mold well, and clearance fit or interference fit may easily occur. In addition, in order to achieve a better insulating effect, it is necessary to increase the thickness of the insulating layer. However, the increase in thickness is prone to peeling of the insulating varnish, and the durability of the sensor cannot be guaranteed.

[0057] Based on the comprehensive consideration of the...

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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 [0001] The invention relates to the field of injection molding, in particular to a point electrode capacitance sensor and an injection molding machine using the sensor. 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. This method provi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C45/76
CPCB29C45/76B29C2945/76257
Inventor 莫胜勇姚科高福荣
Owner GUANGZHOU HKUST FOK YING TUNG RES INST
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