CN201300524Y - High-frequency heating device for injection molding machine - Google Patents

Abstract

The utility model discloses a high-frequency heating device for an injection molding machine, which comprises a gun barrel, an injection molding machine circuit control device and an alternating current power supply, a rectifying circuit and an amplifying circuit which are controlled by the circuit control device, wherein a high-efficiency heat insulation layer is wrapped on the outer circle surface of the gun barrel, and a plurality of groups of high-frequency induction coils are arranged on the outer surface of the high-efficiency heat insulation layer; the alternating current power supply controlled by the controller is connected with a high-frequency pulse generator through a rectifying circuit. It utilizes electromagnetic induction principle to become heat energy with electric energy conversion, produce heat heating plastic material through the whole magnetic induction of metal barrel and melt, because the high-efficient insulating layer protection of barrel skin, through circuit control device and sensor control temperature, it is real-time accurate, the heat that the metal barrel response produced heats complete melting with plastic material, heat outward diffusion has effectively been prevented, when improving injection moulding quality and production efficiency, the on-the-spot operational environment has been improved, the problem of current injection moulding equipment energy waste has been solved, environmental pollution, product quality and production efficiency.

Description

High frequency heating device for injection molding machine

technical field

The utility model belongs to the technical field of injection molding equipment, and relates to a structure of a high-frequency heating device, in particular to a high-frequency heating device for an injection molding machine.

Background technique

The injection molding machine in the prior art is to use the injection molding machine to heat the barrel to melt the plastic raw material, and then through the thrust of the screw or plunger arranged in the injection molding machine, the plastic that has been plasticized in a molten state (that is, a viscous flow state) is injected under high pressure. The process of quickly injecting into the closed mold cavity and obtaining the finished product after curing and shaping.

According to the plasticizing method, the injection molding machine can be divided into: screw type and plunger type; according to the arrangement of the injection device and the clamping device, the injection molding machine can be divided into: vertical type, horizontal type and angle type. The most widely used is the horizontal screw injection molding machine. The heating method of the injection molding machine for the plastic material is to heat through the resistance wire wrapped outside the heating barrel, or through the electromagnetic eddy current induction heating of the electromagnet distributed on the barrel to heat up, so that the plastic material is melted by the heating barrel. . In these ways, the heat is transferred to the barrel through contact conduction, and only the heat close to the inside of the barrel is transferred to the barrel, and most of the heat outside the resistance wire or electromagnetic induction heating ring is lost to the air. There is always a large amount of heat loss in the process, which will cause high temperature and stuffiness in the processing site, and the working environment is harsh; in addition, the resistance wire heating type resistance wire itself generates high temperature, and then its heat is slowly conducted from the high temperature area on the outer surface of the barrel to the gun barrel. In the low temperature area of the center of the barrel, the transmission speed is slow, and there is a large error between the actual temperature of the plastic material at the center of the barrel and the surface temperature of the barrel. When the temperature of the plastic reaches the requirement, although the resistance wire stops heating, due to the temperature error, the barrel The surface still continues to conduct heat to the inside of the barrel, resulting in inaccurate temperature control, which not only affects the quality of injection molding, but also reduces production efficiency. Therefore, the existing injection molding machines have problems of consuming time and electricity and affecting product quality and output.

Contents of the invention

The purpose of this utility model is to provide a high-frequency heating device for injection molding machines with simple structure, energy saving and environmental protection. It adopts the principle of high-frequency induction heating to heat plastic materials through the overall magnetic induction of metal barrels. The temperature control is real-time and accurate. The outer layer of the barrel is protected by a high-efficiency heat insulation layer. The heat generated by the induction of the metal barrel is basically absorbed by the plastic material, so that the raw material is completely melted, effectively preventing the heat from spreading outward, and improving the injection molding quality and production efficiency of injection molded products. At the same time, the on-site working environment is also improved, and the problems of large energy waste, serious environmental pollution, low product quality and low production efficiency of existing injection molding equipment are solved.

The technical solution adopted by the utility model is, a high-frequency heating device for injection molding machine, including a barrel, an injection molding machine circuit control device and a high-frequency control circuit controlled by the injection molding machine circuit control device, wrapped on the outer surface of the barrel A layer of high-efficiency heat insulation layer, several groups of high-frequency induction coils are arranged on the outer surface of the high-efficiency heat insulation layer, and sensors are evenly distributed in the barrel.

The several groups of high-frequency induction coils are uniformly distributed along the axial direction of the gun barrel and installed on the outer surface of the high-efficiency heat insulation layer.

The AC power controlled by the circuit control device of the injection molding machine is connected with a high-frequency pulse generator through a rectification circuit, and the high-frequency induction coil is connected with the MCU through the high-frequency pulse generator.

The utility model high-frequency heating device for injection molding machine is a device that converts electric energy into heat energy by using the principle of electromagnetic induction. The high-frequency controller converts 220V, 50/60Hz alternating current into direct current, and then converts direct current into high frequency of 20-40Hz. High-frequency high-voltage electricity, heat generated by the overall magnetic induction of the metal barrel to heat the plastic material, control the temperature through the circuit control device and sensors, real-time and accurate, because the outer layer of the barrel is protected by a high-efficiency heat insulation layer, the heat generated by the induction of the metal barrel is basically It is used for heating plastic materials to completely melt the raw materials, effectively preventing the heat from spreading outward, improving the quality and efficiency of injection molded products, and solving the problems of energy, environmental protection, quality and efficiency existing in existing injection molding equipment.

Description of drawings

Fig. 1 is a structural schematic diagram of a high-frequency heating device for an injection molding machine of the present invention;

Fig. 2 is a partial cross-sectional view of the high-frequency heating device for the injection molding machine of the present invention;

Fig. 3 is a schematic diagram of the control circuit of the high-frequency heating device for the injection molding machine of the present invention.

In the figure, 1. Barrel, 2. Circuit control device of injection molding machine, 3. High-frequency pulse generator, 4. AC power supply, 5. High-efficiency heat insulation layer, 6. High-frequency induction coil, 7. Sensor, 8. Feeding Barrel, 9. Die head, 10. Drive circuit, 11. Amplifying circuit, 12 Resonant circuit.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

A high-frequency heating device for an injection molding machine, as shown in Figure 1 and Figure 2, a high-frequency heating device for an injection molding machine, including a barrel 1, an injection molding machine circuit control device 2, and a high-frequency heating device controlled by the injection molding machine circuit control device 2 frequency control circuit; a layer of high-efficiency heat insulation layer 5 is wrapped on the outer surface of the barrel 1, and several groups of high-frequency induction coils 6 are arranged on the outer surface of the high-efficiency heat insulation layer 5, and sensors are evenly distributed in the barrel 1 7.

Several sets of high-frequency induction coils 6 are installed on the outer surface of the high-efficiency heat insulation layer 5 evenly distributed along the axial direction of the gun barrel 1; the AC power controlled by the circuit control device 2 is connected with a high-frequency pulse generator 3 through a rectifier circuit, and the high-frequency induction The coil 6 is connected with the MCU through the high-frequency pulse generator 3 .

The control circuit of the high-frequency heating device for the injection molding machine of the utility model is shown in Figure 3. When in use, the power is turned on, and the plastic material is injected into the gun barrel 1 from the feeding barrel 8, and the circuit control device 2 converts the 220V, 50/60Hz alternating current into direct current, and then convert the direct current into high-frequency high-voltage electricity with a frequency of 20-40 Hz. The high-frequency high-voltage current that changes at a high speed flows through the high-frequency induction coil 6 that is coated on the outside of the gun barrel 1 to generate a high-speed alternating magnetic field. When the magnetic field lines in the magnetic field pass through the magnetically conductive metal barrel 1, countless small eddy currents will be generated in the metal barrel 1, which will cause the metal barrel 1 to heat itself at high speed, thereby heating the plastic material in the barrel 1 and melting it. Then the molten plastic is quickly injected into the closed die head 9 cavity with a screw rod for injection molding. Since there is a layer of high-efficiency heat insulation layer 5 between the high-frequency induction coil 6 and the barrel 1, only a small amount of heat inside the barrel 1 is radiated into the air. After testing, the utility model saves 40% of electric energy compared with the existing injection molding machine. 60%, the power saving effect is more obvious for high-power injection molding machines. The utility model adopts high-frequency induction so that the heated metal gun barrel 1 generates heat through its own current, and the heat energy is generated by the whole gun barrel 1. In order to make the temperature control real-time and accurate, sensors 7 are evenly distributed in the gun barrel 1. The temperature inside and outside the barrel 1 is the same. Once the plastic material in the barrel is heated to the temperature of the set melting state, the sensor 7 will send a signal to the circuit control device of the injection molding machine to control the current on and off, thereby controlling the high-frequency control circuit. The high-frequency control circuit It will automatically stop heating, so the real-time and accurate temperature control is realized, the product quality is improved, and the production efficiency is greatly improved. And because it is different from other heating methods, the outer surface temperature of the high-frequency induction coil 6 is low, it will not burn the foreign matter, plastic particles, oil stains and dust adsorbed on its surface, and will not produce harmful gas, which improves the work at the production site Conditions are conducive to the physical and mental health of operators, and the working environment is greatly improved.

The above-mentioned embodiment is only an example of the utility model, and is not used to limit the implementation of the utility model and the scope of rights. All equivalent changes and modifications made according to the content of the patent protection scope of the utility model application shall be included in this utility model. Within the scope of utility model patent application.

Claims (3)

1, a kind of injection machine thermatron, the high frequency control circuit that comprises gun barrel (1), injection machine circuit control device (2) and injection machine circuit control device (2) control, it is characterized in that, outer round surface parcel one deck effectively insulating layer (5) at gun barrel (1), be provided with some groups of radio-frequency induction coils (6) at effectively insulating layer (5) outer surface, in gun barrel (1), also evenly be distributed with sensor (7).

2, injection machine thermatron according to claim 1 is characterized in that, described some groups of radio-frequency induction coils (6) axially evenly distribute along gun barrel (1) and are installed in effectively insulating layer (5) outer surface.

3, injection machine thermatron according to claim 1, it is characterized in that, the AC power of described injection machine circuit control device (2) control is connected with high frequency pulse generator (3) through rectification circuit, and described radio-frequency induction coil (6) is connected with MCU by high frequency pulse generator (3).

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