CN201629871U - An electromagnetic induction single-coil heating device for a barrel with multiple temperature zones - Google Patents

Abstract

The utility model relates to an electromagnetic induction single-coil heating device for a multi-temperature zone material cylinder, in particular to an electromagnetic induction heating device for a multi-temperature zone material cylinder. It includes an induction heating power supply, a barrel, and a heat insulation layer on the barrel; the outer peripheral surface of the heat insulation layer is wound with unevenly distributed electromagnetic induction heating coils along the length direction of the barrel; the electromagnetic induction heating coil is A temperature sensor is provided, the output end of the temperature sensor is connected to the input end of the temperature controller, and the output end of the temperature controller is connected to the input end of the induction heating power supply; the induction heating power supply is connected to the electromagnetic induction heating coil. The utility model has the advantages of low cost, simple structure and convenient installation and maintenance.

Description

An electromagnetic induction single-coil heating device for a barrel with multiple temperature zones

technical field

The invention relates to an electromagnetic induction heating device, in particular to an electromagnetic induction single-coil heating device for a barrel with multiple temperature zones

Background technique

According to the requirements of the production process, during the heating process of the barrel of the plastic molding machine, the temperature requirements of different parts of the barrel are different. Generally, the barrel is divided into multiple temperature zones (generally divided into 3 to 10 temperature zones), and each temperature zone is heated and controlled by different heating devices and temperature control instruments. As shown in Figure 1, it is a commonly used high-power electromagnetic heating device at present. For the barrel 1 with multiple temperature zones, each temperature zone uses a separate induction heating power supply to heat the barrel 1. In Fig. 1, the barrel 1 is provided with three groups of electromagnetic induction heating coils 3, each group of electromagnetic induction heating coils 3 is provided with a temperature controller 5, and the output terminal of the temperature controller 5 is connected to the corresponding induction heating power supply 4; The temperature controller 5 controls the heating time of different electromagnetic induction heating coils 3 on the barrel 1 by controlling the energization time of the induction heating power supply 4 , so as to realize the requirements for heating temperatures in different temperature zones of the barrel 1 . This method is mainly suitable for heating when the heating power is increased. Its main advantage is that it is easy to control, and each temperature zone has an independent power supply. When the total heating power is small, if each temperature zone is still equipped with a power supply for heating, it will cause waste of power, take up a lot of space, increase costs, and cause waste of resources.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art, and provide an electromagnetic induction single-coil heating device for multi-temperature zone barrels, which has low cost, simple structure, and convenient installation and maintenance.

According to the technical solution provided by the present invention, an electromagnetic induction single-coil heating device for a barrel with multiple temperature zones includes an induction heating power supply, a barrel, and a heat insulation layer on the barrel; the outer peripheral surface of the heat insulation layer An electromagnetic induction heating coil with uneven distribution is wound along the length direction of the barrel; a temperature sensor is arranged on the electromagnetic induction heating coil, and the output end of the temperature sensor is connected to the input end of the temperature controller, and the temperature controller The output end of the induction heating power supply is connected with the input end of the induction heating power supply; the induction heating power supply is connected with the electromagnetic induction heating coil.

The induction heating power supply is provided with a power plug. The induction heating power supply is connected to both ends of the electromagnetic induction heating coil through a power cord and a connector. The thickness of the heat insulation layer is 15-40mm. The output voltage of the induction heating power supply is 200-800V, and the frequency is 8-40KHz alternating current. The barrel is made of steel, alloy steel or stainless steel.

The advantages of the present invention: the present invention adopts an induction heating power supply to heat the material cylinder to meet the temperature requirements of different temperature zones of the material cylinder, and the equipment cost is low. The induction heating power supply is directly connected to the two ends of the electromagnetic induction heating coil, no other control device is needed, the structure is simple, the technical requirements of the installation and maintenance personnel are reduced, and the installation and maintenance are convenient.

Description of drawings

Fig. 1 is a schematic structural diagram of an existing electromagnetic induction heating device.

Fig. 2 is a structural schematic diagram of the present invention.

Detailed ways

The present invention will be further described below in conjunction with specific drawings and embodiments.

As shown in Figure 2: the present invention includes a barrel 1, a thermal insulation layer 2, an electromagnetic induction heating coil 3, an induction heating power supply 4, a temperature controller 5, a power cord 6, a power plug 7, a temperature sensor 8 and a connector 9.

As shown in FIG. 2 , a heat insulation layer 2 with a thickness of 15-40 mm is wound on the outer peripheral surface of the barrel 1 , and the heat insulation layer 2 can effectively reduce the heat release of the barrel 1 to the outside. The heat insulation layer 2 is wound with unevenly distributed electromagnetic induction heating coils 3 along the length direction of the barrel 1. The electromagnetic induction heating coils 3 are wound by a high temperature resistant cable. The electromagnetic induction heating coils 3 Can withstand high temperature above 190 degrees. The distribution density of the electromagnetic induction heating coil 3 is related to the temperature requirements of different positions of the barrel 1; when the heating temperature of the corresponding part in the barrel 1 is high, the distribution density of the corresponding electromagnetic induction heating coil 3 on the heat insulation layer 2 large; when the heating temperature of the corresponding part in the barrel 1 is low, the distribution density of the corresponding electromagnetic induction heating coil 3 on the heat insulation layer 2 is small; the asymmetric distribution of the electromagnetic induction heating coil 3 realizes the Requirements for different heating temperatures. A temperature sensor 8 is provided at the place with the highest distribution density on the electromagnetic induction heating coil 3 , and the output end of the temperature sensor 8 is connected with the input end of the temperature controller 5 . The temperature sensor 8 detects the heating temperature in the corresponding part of the barrel 1, and transmits the above-mentioned temperature value to the temperature controller 5; the temperature controller 5 compares the temperature value set in the temperature controller 5, and when detecting When the temperature value reached is higher than the set temperature value, the temperature controller 5 outputs a control signal to the induction heating power supply 4, and controls the induction heating power supply 4 to disconnect from the electromagnetic induction heating coil 3, so as to avoid damage to the corresponding parts in the barrel 1. overheat. Other parts of the electromagnetic induction heating coil 3 can also be provided with a temperature sensor 8 according to the needs of the injection molding machine itself.

The power supply end of the induction heating power supply 4 is provided with a power plug 7, and the induction heating power supply 4 is connected to an external power supply through the power plug 7 to provide electric energy for the entire electric heating device. The induction heating power supply 4 utilizes the power cord 6 and the connector 9 to be connected with the two ends of the electromagnetic induction heating coil 3, so that a loop is formed between the induction heating power supply 4 and the electromagnetic induction heating coil 3; when the induction heating power supply 4 is switched on, the electromagnetic induction heating An induced current will be generated in the coil 3 . When there is an induced current in the electromagnetic induction heating coil 3 , according to the principle of electromagnetic induction, the electromagnetic induction heating coil 3 will generate an eddy current in the barrel 1 , thereby heating the material in the barrel 1 . The distribution density of the electromagnetic induction heating coil 3 is different, and the size of the eddy current generated in the barrel 1 is different, so that the heating temperature in the barrel 1 is different, and the heating in different temperature zones of the barrel 1 is realized. The barrel 1 is made of ordinary steel, alloy steel or stainless steel, and can generate electromagnetic induction with the electromagnetic induction heating coil 3 . The output frequency of the induction heating power supply 4 is 8-40KHz, and the voltage is an alternating current of 200-800V.

As shown in Figure 2: when in use, the power plug 7 is connected to an external power supply to provide electric energy for the induction heating power supply 4 . The induction heating power supply 4 is connected to both ends of the electromagnetic induction heating coil 3 , forms a closed loop with the electromagnetic induction heating coil 3 , and generates an induced current in the electromagnetic induction heating coil 3 . The induced current generated in the electromagnetic induction heating coil 3 generates an eddy current in the barrel 1; the density distribution of the electromagnetic induction heating coil 3 is different, and the size of the eddy current generated in the barrel 1 is different, thereby obtaining different temperatures in the barrel 1 heating zone. The temperature sensor 8 is set at the place where the density distribution of the electromagnetic induction heating coil 3 is the largest, which is used to detect the temperature of the corresponding part in the barrel 1, and transmits it to the temperature controller 5 to control the on-off of the induction heating power supply 4, so as to prevent the heating temperature in the barrel 1 from increasing. overheating; when the induction heating power supply 4 is disconnected, the closed circuit between the induction heating power supply 4 and the electromagnetic induction heating coil 3 is disconnected, the induced current in the electromagnetic induction heating coil 3 disappears, and the heating of the material in the barrel 1 is stopped. When the temperature requirement in the barrel 1 changes, the device corresponding to the heating requirement can be obtained by changing the distribution density of the electromagnetic induction heating coil 3 in the corresponding part, and the operation is convenient.

The present invention utilizes the principle of electromagnetic induction to heat the material in the barrel 1 . Through the difference in distribution density of the electromagnetic induction heating coil 3 on the barrel 1 , the heating temperature requirements of different temperature zones in the barrel 1 are realized. The electromagnetic induction heating coil 3 generates eddy current in the barrel 1, which can melt the material in the barrel 1, with high speed, low energy consumption and stable temperature control. The present invention can be applied to barrel heating of plastic injection machines, barrel heating of plastic extruders (door and window profiles, pipes, granulators, etc.), barrel heating of plastic film blowing machines, barrel heating of chemical fiber equipment, and food puffing equipment. The cylinder heating and the small cylinder heating of various drying equipment are low in cost and high in control accuracy. Using the temperature sensor 8 and the temperature controller 5 to control the opening and closing of the electromagnetic induction heating coil 3 and the induction heating power supply 4 does not require a controller, the heating cost is low, the structure is simple, and the installation and maintenance are convenient.

Claims (6)

1. A heating device for an electromagnetic induction single coil of a multi-temperature zone barrel, comprising an induction heating power supply (4), a barrel (1) and a thermal insulation layer (2) positioned on the barrel (1), which The feature is: the outer peripheral surface of the heat insulation layer (2) is wound with electromagnetic induction heating coils (3) unevenly distributed along the length direction of the barrel (1); the electromagnetic induction heating coil (3) is provided with a temperature sensor (8), the output end of the temperature sensor (8) is connected to the input end of the temperature controller (5), and the output end of the temperature controller (5) is connected to the input end of the induction heating power supply (4); The induction heating power supply (4) is connected with the electromagnetic induction heating coil (3). 2. An electromagnetic induction single-coil heating device for a barrel with multiple temperature zones according to claim 1, characterized in that: said induction heating power supply (4) is provided with a power plug (7). 3. A heating device for an electromagnetic induction single coil for a barrel with multiple temperature zones according to claim 1, characterized in that: the induction heating power supply (4) passes through the power cord (6) and the connector (9) ) is connected to the two ends of the electromagnetic induction heating coil (3). 4. An electromagnetic induction single-coil heating device for a barrel with multiple temperature zones according to claim 1, characterized in that: the thickness of the heat insulation layer (2) is 15-40 mm. 5. An electromagnetic induction single-coil heating device for multi-temperature zone barrels according to claim 1, characterized in that: the induction heating power supply (4) has an output voltage of 200-800V and a frequency of 8-800V. 40KHz AC. 6. An electromagnetic induction single-coil heating device for a barrel with multiple temperature zones according to claim 1, characterized in that: the barrel (1) is made of steel, alloy steel or stainless steel.

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