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Protector of plastic molding machine

A technology for protection devices and molding machines, applied in the field of circuit protection devices, can solve the problems of easy breakdown of plastic workpieces, poor stability of protection devices and difficulty in breakdown of high-frequency plastic molding machine workpieces, etc., achieving low production costs and obvious protection effects , The effect of protecting the workpiece from breakdown

Inactive Publication Date: 2009-07-22
余张坚
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, since the protection circuit 13 shares the same ground with the high-frequency circuit 11 of the molding machine, that is, it is directly connected, high-frequency interference can easily enter the protection circuit 13, resulting in poor stability of the protection device, and it is difficult to break down the workpiece of the high-frequency plastic molding machine effective protection
At present, technical personnel in this industry do not have enough understanding of this high-frequency interference problem, and have not found an effective technical solution to this problem, resulting in the use of high-frequency electric fields to heat plastic workpieces for molding and welding. The defect of breakdown has not been fundamentally overcome for a long time

Method used

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  • Protector of plastic molding machine
  • Protector of plastic molding machine
  • Protector of plastic molding machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] see image 3 , the detection circuit 2 of the present embodiment is provided with a sampling resistor R on the screen current circuit of the high-frequency oscillator of the electron tube, which is used for screen current sampling; the signal transmission unit 3 is a photocoupler M, and the signal passes through the electric-optical-electrical path Transmission to the protection circuit 4, thereby realizing the electrical isolation of the protection circuit 4 and the high-frequency circuit 1; the protection circuit 4 of this embodiment contains a resistor R 1 , Transistor BG 1 , Relay J. One end of the sampling resistor R is grounded, the other end is connected to the cathode of the tube high-frequency oscillator, and this end passes through a resistor R at the same time. 2 Connect to the anode of the light-emitting diode in the photocoupler M, and connect the cathode of the light-emitting diode to the comparison voltage V 0 , The emitter of the photosensitive tube i...

Embodiment 2

[0032] see Figure 4, the detection circuit 2 of the present embodiment is the same as the embodiment 1, and also adopts the sampling resistor R; the signal transmission unit 3 adopts the transformer B, and a current transformer can also be used as the signal transmission unit 3, and the detection signal is transmitted through the electric-magnetic-electrical way to protection circuit 4. The input terminals of the transformer B are respectively connected to the output terminals of the sampling resistor R and the comparison voltage V 0 , The output terminals are respectively grounded and connected in series with a diode D, followed by a protection circuit 4. The protection process of the protection device of the plastic molding machine of this embodiment is the same as that of Embodiment 1.

Embodiment 3

[0034] see Figure 5 , the detection circuit 2 of this embodiment is the same as the embodiment 1, the photosensitive element of the optocoupler used by the signal transmission unit 3 is a photocell U, and the detection signal is transmitted through the electric-optical-electrical route. The anode of the light-emitting diode in the photocoupler is connected to the output terminal of the sampling resistor R, the negative pole of the light-emitting diode is connected to the adjustable terminal of the potentiometer W, the output terminal of the photocell U is connected to the protection circuit 4, and the two fixed terminals of the potentiometer W are respectively Connect to potential +E 0 peacefully. The protection device compares the voltage V 0 Provided by the potentiometer W, the maximum screen current value can be set according to the processing needs, so as to realize the automatic operation of the output power of the preset high-frequency molding machine. When the moldi...

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Abstract

The invention discloses a circuit protection device, particularly a protection device for a plastic molding machine, which is used for the breakdown protection of a workpiece of a high-frequency plastic molding machine. The protection device of the plastic molding machine includes a detection circuit and a protection circuit connected to the high-frequency circuit of the molding machine. A signal transmission unit with a non-electric medium as the medium, the output of the signal transmission unit is connected to a protection circuit. The invention overcomes the defects existing in the prior art, can block high-frequency interference signals from entering the protection circuit, and can effectively protect the breakdown of the high-frequency plastic molding machine workpiece.

Description

technical field [0001] The invention relates to a circuit protection device, in particular to a protection device for a plastic molding machine, which is used for breakdown protection of high-frequency plastic molding machine workpieces. Background technique [0002] Putting the plastic workpiece in the working capacitor, using the high-frequency electric field to heat it for molding and welding processing, has the advantages of uniform heating and good product quality. The breakdown of the workpiece produces a strong arc, resulting in damage to the workpiece or even ablation of the mold, resulting in material scrap and equipment damage. Therefore, it is necessary to protect the processing process. The existing technology utilizes the law that the potential or current of certain points in the high-frequency circuit of the molding machine will change when the workpiece breaks down, and sets detection points on the high-frequency circuit 11 of the molding machine, connects to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C43/00B29C51/00B29C65/00
Inventor 余张坚
Owner 余张坚