KR20140089738A - Heating apparatus for cylinder using high frequency induction heating - Google Patents

Abstract

The present invention relates to a heating apparatus for a cylinder using high frequency induction heating which controls operation by using a single inverter of heating blocks independently heating multiple sections and is able to largely reduce manufacturing costs and performing correct temperature control by independently and sequentially controlling the heating blocks according to predetermined temperature. The heating apparatus comprises multiple hating blocks installed on the outer peripheral of a cylinder. Each heating block includes a temperature sensor sensing the temperature of a corresponding heating block, and an induction coil. The heating apparatus comprises: relays which apply or block induction coil driving power provided to the heating blocks; an inverter driving means which provides driving power to the induction coil of a corresponding heating block so that the temperature of the corresponding heating block is maintained at predetermined temperature in the basis of a current temperature signal and the predetermined temperature of the heating block connected to a current relay provided from a relay control means; and a relay driving means which gives orders so that the relays come sequentially for constant period and provide a current temperature signal and the predetermined temperature of a heating block connected to each relay to the inverter driving means.

Description

TECHNICAL FIELD [0001] The present invention relates to a heating apparatus for a cylinder using high frequency induction heating,

The present invention relates to a heating apparatus for a cylinder to which a high frequency induction heating system is applied, and more particularly, to a heating apparatus for heating a heating block for independently heating a plurality of sections using a single inverter, And more particularly, to a heating apparatus for a cylinder using a high-frequency induction heating so that accurate temperature control and manufacturing cost can be greatly reduced.

The cylinder as is known may be applied to, for example, an extruder or an extruder, or it may be an accessory that may be applied to another pipe type of temperature control field.

In the accompanying drawings, FIG. 1 shows a main structure of a general injection molding machine.

A conventional injection machine includes a cylinder 10 in the form of a pipe and a tip 11 of the cylinder 10 is provided with a nozzle 11 through which molten plastic material is discharged, And is connected to the device 70.

A screw 20 reciprocating is mounted in the cylinder 10.

The screw 20 is formed with a threaded portion 21 and a screw head 22 is mounted on the front surface and a hydraulic cylinder 30 and a rotary motor 40 are connected to the other end.

The cylinder 10 is provided with a hopper 60 into which a plastic material is injected and a heating device 50 for melting the plastic material injected into the cylinder through the hopper 60 is provided on the outer circumferential surface of the cylinder 10, Respectively.

When the plastic material is injected into the cylinder 10 through the hopper 60, the injected material is heated by the heating device 50, and is mixed with the rotation of the screw 20. In this case, And is injected into the mold apparatus 70 through the cylinder nozzle 11 while being melted.

The molten plastic material injected into the mold apparatus 70 is released from the mold while the screw 20 is retracted to initiate a new injection molding cycle.

Referring to the heating device 50 applied to such an injection molding machine,

The heating device 50 serves to heat and maintain the temperature of the cylinder 10 constantly in order to melt the plastic material injected into the cylinder 10.

Also, since the heating device 50 needs to heat a relatively wide section, the heating device 50 generally includes a plurality of heating blocks in consideration of the maximum load capacity of the heater.

In this embodiment, three heating blocks, such as the first heater unit 51, the second heater unit 52 and the third heater unit 53, are formed.

Also, most of the conventional heating devices use a heating method, which causes a large amount of power consumption, and a heating device using a high frequency induction heating method with remarkably low power consumption has been developed in recent years.

The heating device 50 of the cylinder 10 using the induction heating method is provided with a plurality of heating blocks 51, 52, In general, the inverter driving apparatus is mounted on the cylinder 10 of the injector in at least about 7 to 8 heating blocks. The cost of the inverter driving apparatus corresponding thereto increases the product cost.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a heating control apparatus and a heating control method thereof, in which heating blocks for independently heating a plurality of sections are driven and controlled using a single inverter, The present invention is to provide a heating apparatus for a cylinder using a high frequency induction heating so that accurate temperature control and manufacturing cost can be greatly reduced.

According to an aspect of the present invention, there is provided a method of manufacturing a semiconductor device including a plurality of heating blocks mounted on an outer circumferential surface of a cylinder, Each of the heating blocks includes an induction coil and a temperature sensor for sensing a temperature of the heating block; The temperature of the corresponding heating block is set based on the set temperature and the current temperature signal of the heating block connected to the current relay provided from the relay control means and the relays that apply or cut off the induction coil driving power provided by the heating blocks, A controller for instructing the relays to be sequentially turned on for a predetermined time, and for controlling the set temperature and current temperature signal of the heating block connected to each relay to the inverter drive And a relay drive means for providing the drive signal to the drive means.

Further, the relays according to the present invention may further comprise: a first relay interposed between the first induction coil and the inverter driving means of the first heater portion; a second relay interposed between the second induction coil of the second heater portion and the inverter driving means; A third induction coil of the third heater unit, and a third relay interposed in the inverter driving unit.

The inverter driving means according to the present invention further includes a rectifying portion for rectifying the AC input power to a DC power source, a constant voltage portion for boosting and outputting a DC voltage inputted through the rectifying portion to a constant voltage, A switching signal output unit for outputting a switching signal to a switching element of the inverter unit, and a setting unit for setting a specific heating block input from the relay control unit, And an output control unit for outputting a switching control signal to the switching signal output unit so that the temperature of the specific heating block is maintained at the set temperature according to the temperature and the current temperature signal.

Further, the relay control means according to the present invention may further include a relay driving portion for turning on and off each relay of the relay portion, a temperature detecting portion for inputting the temperature of each heating block detected from the temperature sensor to the relay control portion, A relay for supplying a set temperature and a current temperature signal of a heating block connected to each relay to the inverter driving means in order to input a set temperature of the heating blocks, And a control unit.

Further, the relay control means according to the present invention sequentially connects the relays connected to the heating block, and when the heating block connected to the corresponding relay reaches the set temperature, the relay connected to the heating block is interrupted, the next relay is turned on, And when the temperature is reached, driving control for connecting the next relay is sequentially performed.

As described above, according to the present invention, the heating blocks for independently heating a plurality of sections are driven and controlled by using a single inverter, and the heating blocks are sequentially and independently controlled according to the set temperature, It offers the advantage of being able to.

In addition, the present invention provides the advantage that the power consumption can be greatly reduced by making the heating device mounted on the cylinder a heating device using the high frequency induction heating method.

1 is a schematic view of a general injection molding machine,
2 is a configuration diagram of a cylinder heating apparatus using high frequency induction heating according to an embodiment of the present invention,
3 is a detailed circuit block diagram of a relay control means and an inverter driving means according to an embodiment of the present invention;
4 is an output waveform diagram of an inverter driving means to which the present invention is applied.

In the drawings, the same reference numerals as possible denote the same elements in the drawings, although they are shown in different drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

2 is a configuration diagram of a cylinder heating apparatus using high frequency induction heating according to an embodiment of the present invention.

As shown in the figure, in a heating apparatus for a cylinder using high frequency induction heating,

And a plurality of heating blocks mounted on the outer circumferential surface of the cylinder (10).

The heating block includes a first heater unit 51, a second heater unit 52, and a third heater unit 53.

Here, the cylinder 10 will be described as an example of a cylinder applied to an injector or an extruder, but is not limited thereto.

The number of the heating blocks is three, but the present invention is not limited thereto.

Each of the heating blocks includes an induction heating coil and a temperature sensor for sensing a temperature of the heating block.

That is, the first heater 51 and the second heater 52 are connected by a first induction coil 51a and a temperature sensor 51b, a second heater 52 by a second induction coil 52a and a temperature sensor 52b, The portion 53 includes a third induction coil 53a and a temperature sensor 53b.

Further, the present invention is characterized in that, based on the set temperatures and the current temperature signals of the heating blocks connected to the current relay provided from the relay control means and the relays that apply or block the induction coil driving power provided by the heating blocks, (110) for supplying driving power to the induction coil of the heating block so that the temperature of the heating block is maintained at a predetermined temperature, And a relay driving means (120) for providing a current temperature signal to the inverter driving means (110).

The relays include a first relay 101 interposed between the first induction coil 51a of the first heater unit 51 and the inverter driving means 110 and the second relay 101 of the second heater unit 52, A second relay 102 interposed between the coil 52a and the inverter driving means 110 and a third relay 102 interposed between the third induction coil 53 of the third heater portion 53 and the inverter driving means 110, And a relay (103).

More detailed configurations of the inverter driving means 110 and the relay control means 120 will be described with reference to Fig.

The inverter driving unit 110 includes a rectifying unit 111 for rectifying the AC input power source AC to a DC power source and a constant voltage unit for boosting the DC voltage input through the rectifying unit 111 to a constant voltage The induction coils 51a to 53a of the corresponding heating blocks 51 to 53 are supplied with power through the relay units 101 to 103 by being switched and receiving a DC voltage through the constant voltage unit 112 A switching signal output section 114 for outputting a switching signal to the switching elements Q1 and Q2 of the inverter section 113 and a switching signal output section 114 for outputting a switching signal to the switching elements Q1 and Q2 of the specific heating block And an output control unit 115 for outputting a switching control signal to the switching signal output unit 114 so that the temperature of the specific heating block maintains the set temperature according to the set temperature and the current temperature signal.

The relay control means 120 includes a relay driving portion 121 for turning on and off each of the relays 101 to 103 of the relay portion and a relay control portion 121 for controlling the temperature of each heating block detected from the temperature sensors 51b to 53b, A setting unit 123 for inputting a set temperature of each heating block to the relay control unit 124 and a controller 122 for controlling the relay driving unit 121 such that the relays are sequentially turned on And a relay control unit (124) for providing the set temperature and current temperature signal of the heating block connected to each relay to the inverter driving means (110).

In addition, the relay control unit 120 controls the heating block by sequentially connecting the relays connected to the heating block. When the heating block connected to the relay reaches the set temperature, the relay control unit 120 cuts off the currently connected relay and turns on the next relay And a driving control for connecting the next relay when the heating block connected thereto reaches the set temperature.

The operation of the inverter driving means 110 and the relay control means 120 constructed as above will be described.

First, when the power source AC is input, the input AC power source is rectified and smoothed through the rectifying unit 111, converted into direct current power, boosted through the constant voltage unit 112, and applied as a driving voltage to the inverter unit 113 .

At this time, the output control unit 115 outputs a switching control signal for driving and controlling the inverter unit 113 based on the set temperature and the current temperature signal of the specific heating block input from the relay control unit 120 to the switching signal output unit 114 .

Therefore, the switching signal output unit 114 outputs the switching pulse signal as shown in (A) and (B) of FIG. 4 to the output ports G1 and G2.

The pulse signal P1 as shown in Figure 4A output to the port G1 of the switching signal output unit 114 turns on the switching element Q1 of the inverter unit 113 and turns on the switching element Q1, The current flows through the induction coils 51a to 53a of the heating blocks 51 to 53 through the relays selected from the relay units 101 to 103 through the relay.

For example, when the first relay 101 is turned on by the relay control means 120, current flows through the first induction coil 51a of the first heater unit 51, which is a heating block.

4, which is outputted at the port G2 of the switching signal output unit 114 at the time point t2 after a certain time interval, the pulse signal P1 shown in (A) is turned off at the time point t1 of FIG. The pulse signal as shown in Fig. 5B turns on the switching element Q2 of the inverter unit 113 and causes the current to flow through the first induction coil 51a through the switching element Q2.

Therefore, the first induction coil 51a is driven to generate an induction current to heat the first heater unit 51. [

At this time, the widths T1 of the pulse signals P1 output to the ports G1 and G2 of the switching signal output unit 114 are equal to each other.

The output control unit 115 receives the set temperature and the current temperature signal of the selected heating block (first heater unit) input from the relay control unit 120 and outputs the set temperature of the corresponding heating block (first heater unit) So that the output is controlled.

That is, the pulse width T1 of the pulse signal P1 output to the port G1 of the switching signal output unit 114 is increased (P2) or decreased (P3) as shown in FIG. 4 (A) The amount of current flowing through the heating resistor 51a is varied to control the temperature.

If the pulse width T2 of the pulse signal P1 at the output port G1 of the switching signal output unit 114 is changed to the pulse signal P2, the pulse width T2 output to the port G2 As shown in Fig. 4 (C).

When the set temperature is input to the relay control unit 124 from the first to third controllers 51 to 53 which are heating blocks through the setting unit 123, And outputs a command for driving and controlling them.

At this time, the relay control unit 120 drives and controls the heating blocks in two ways.

First, the first control method is a simple time-division method in which the relays 101 to 103 of the relay unit are sequentially turned on for a predetermined time, and the temperature of the heating block connected to each relay is detected to maintain the set temperature.

 That is, the relay control unit 124 sequentially turns on the first relay 101, the second relay 102, and the third relay 103 at predetermined time intervals through the relay driving unit 121.

When the first relay 101 is turned on, the current temperature of the first heater unit 51 detected from the temperature sensor 51b of the first heater unit 51 through the temperature detector 122 and the current temperature of the first heater unit 51 detected by the setting unit 123 to the output control unit 115 of the inverter driving means 110. The output control unit 115 of the inverter driving means 110 receives the set temperature of the first heater unit 51,

The output control unit 115 adjusts the output amount based on the set temperature and the current temperature provided from the relay control unit 120 and outputs a switching signal to the switching signal output unit 114. The switching signal output unit 114 outputs the switching signal, A current flows through the first induction coil 51a through the first relay 101 by driving the inverter unit 113 and the first heater unit 51 generates heat.

The relay control means 120 turns off the first relay 101 and stops providing the current temperature and the set temperature signal of the first heater unit 51 to the inverter driving means 110 do.

At the same time, the relay control means 120 turns on the second relay 102 and provides the current temperature and the set temperature signal of the second heater unit 52 to the inverter driving means 110.

Therefore, the inverter driving unit 110 adjusts the output amount based on the set temperature and the current temperature of the second heater unit 52 provided from the relay control unit 120 and controls the second induction unit 102 via the second relay 102, The current of the coil 52a is controlled.

In this way, the relays 101 to 103 are sequentially turned on at predetermined time intervals to drive and control the corresponding heating blocks.

 In the second control method, the temperature of each heating block is detected in a time division manner according to the temperature detection, and when the corresponding heating block reaches the set temperature, the temperature of the next heating block is detected and the driving of the corresponding heating block is repeatedly executed .

The relay control unit 120 turns on the first relay 101 and detects the temperature of the first heater unit 51 and outputs the set temperature and the current temperature signal of the first heater unit 51 to the inverter driving unit 110 ).

Accordingly, the inverter driving unit 110 adjusts the output amount based on the set temperature and the current temperature of the first heater unit 51 provided from the relay control unit 120, and controls the first induction unit 101 through the first relay 101, And drives the coil 51a.

Then, when the current temperature of the first heater unit 51 reaches the set temperature, the inverter driving means 110 stops outputting, and at the same time, the relay control means 120 turns off the first relay 101 The second relay 102 is turned on.

The relay control unit 120 detects the temperature of the second heater unit 52 and provides the set temperature and current temperature signal of the second heater unit 52 to the inverter driving unit 110, The means 110 adjusts the amount of output based on the set temperature and the current temperature of the second heater unit 52 provided from the relay control means 120 and controls the second induction coil 52a through the second relay 102, .

In this way, the relays 101 to 103 are sequentially turned on, and when the set temperature and the current temperature match, the temperature of the corresponding heating block is sequentially controlled through the next relay.

This method is possible because the heating blocks include an insulating material such as ceramic and the like, and maintain a constant temperature even if the induction coil is not driven for a long time.

According to the present invention, the following control may be performed due to the temperature characteristics of the heating blocks.

That is, when the temperature of the specific heating block is being raised in the temperature control of the heating block, the corresponding relay is shut off in advance before a certain time before reaching the set temperature to stop the driving and control the temperature of the next relay. At this time, even if the heating block is not driven, the temperature is raised.

Also, if the temperature of the heating block is falling, the corresponding relay is turned on in advance before a certain time before falling below the set temperature to start the driving and to control the temperature of the next relay.

As described above, the on / off control of the heating block is predicted and performed before and after a predetermined time with the set temperature as the center, thereby enabling more efficient temperature control.

10: cylinder 50: heating device
51: first heater section 52: second heater section
53: third heater parts 51a to 53a: first to third induction coils to third induction coil
51b to 53b: temperature sensors 101 to 103: relays
110: inverter drive means 111:
112: constant voltage section 113: inverter section
114: switching signal output unit 115: output control unit
120: Relay control means 121: Relay driver
122: Temperature detection unit 123:
124: Relay driver

Claims (6)

A plurality of heating blocks mounted on an outer circumferential surface of the cylinder;
Each of the heating blocks includes an induction coil and a temperature sensor for sensing a temperature of the heating block;
The temperature of the corresponding heating block is set based on the set temperature and the current temperature signal of the heating block connected to the current relay provided from the relay control means and the relays that apply or cut off the induction coil driving power provided by the heating blocks, A controller for instructing the relays to be sequentially turned on for a predetermined time, and for controlling the set temperature and current temperature signal of the heating block connected to each relay to the inverter drive And a relay driving means provided to the cylinder by means of the high frequency induction heating.
The method according to claim 1,
The relays include a first relay interposed between the first induction coil and the inverter driving means of the first heater portion, a second relay interposed between the second induction coil and the inverter driving means of the second heater portion, And a third relay interposed between the third induction coil and the inverter driving means. The method according to claim 1,
Wherein the inverter driving means includes a rectifying section for rectifying the AC input power to a DC power source, a constant voltage section for boosting a DC voltage input through the rectifying section to a constant voltage, A switching signal output unit for outputting a switching signal to the switching element of the inverter unit, and a switching unit for switching the set temperature and the current temperature signal of the specific heating block input from the relay control unit, And outputting a switching control signal to the switching signal output unit so that the temperature of the specific heating block is maintained at a predetermined temperature according to the temperature of the heating block.
The method according to claim 1,
The relay control means includes a relay driving unit for turning on and off each relay of the relay unit, a temperature detection unit for inputting the temperature of each heating block detected from the temperature sensor to the relay control unit, And a relay control unit for instructing the relay driving unit to sequentially turn on the relays for a predetermined time and providing the set temperature and current temperature signal of the heating block connected to each relay to the inverter driving unit A heating device for a cylinder using high frequency induction heating.
The method according to claim 1,
The relay control means sequentially connects the relays connected to the heating block. When the heating block connected to the relay reaches the set temperature, the relay connected to the heating block is interrupted and the next relay is turned on. When the heating block connected thereto reaches the set temperature, And driving control for connecting the relays is sequentially performed. The apparatus for heating a cylinder using high frequency induction heating.
6. The method of claim 5,
Wherein heating and cooling control of the heating block is predicted and performed before and after a predetermined time based on the set temperature of the heating block.

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