KR100306126B1 - Mold heating device by using high-frequency induction heat - Google Patents

Abstract

PURPOSE: Provided is a device for conveniently heating mold for producing a precision glass article without deformation in a short time, using high-frequency induction heat principle. CONSTITUTION: The device comprises a work coil winding around article to be heated; a high frequency oscillator(4) for supplying high frequency electric power to the work coil and induction heating the article; a temperature sensor for maintaining the temperature of mold by controlling the supply of high frequency electric power; a bottom-opened furnace for induction heating the article; elevator for elevating the furnace; a valance unit(10) for keeping its balance with elevating moving of the furnace; an optical sensor(12) which senses heating temperature of the mold by spectrum; a sensor(14) for protecting against overheating of the furnace(8); and a control part(16) therefor.

Description

Mold heating device by using high-frequency induction heat

The present invention provides a mold heating apparatus that can easily heat a mold for manufacturing a glass product requiring high precision, such as a cathode ray tube, in a short time without deformation by using a high-frequency induction heat principle. In detail, the work coil is installed around the edge of the heating furnace in which the heating chamber and the lifting means are installed in the lower part, and then the high frequency feeding line of the high frequency oscillator is connected, and the temperature sensing means is installed in the heating furnace to install the high frequency oscillator. By controlling the high frequency power of the heating element to be heated quickly and easily to the desired temperature.

In general, when industrially repeatedly molding glass products that require precision such as cathode ray tubes (brown tubes), the temperature of the mold is heated to a temperature of 500 ° C. to 600 ° C. similar to the glass solution using heating means, and then the glass products are It prevents defects, deformation and breakage of molded glass products by molding, and when the cathode ray tube molding continues, the temperature of the glass solution is conducted to the mold, so only the initial heating of the mold is required without heating the mold continuously by heating means. You can achieve it.

On the other hand, the heating of large molds is concerned about thermal deformation due to temperature change, so the resistance heating method by electric heater has been adopted so far, but the heating time is too long, which increases the waiting time for heating and the waste of power due to long time heating. A lot.

In addition, the installation cost of the heating device is also large and occupies a lot of space for installing the heating device, but an effective method for improving the situation is not suggested. The manufacturing process of glass products requiring precision such as cathode ray tubes is expensive at a large scale. The production cost of the unit line of equipment is relatively weak compared to other manufacturing lines.

In addition, the initial heating time of the mold also takes more than 3 hours, which takes a lot of preparation time for heating the mold, greatly reducing productivity, and because the moving distance of the heated mold is long, it takes a long time to move to the molding apparatus. There was a problem that the mold falls below the required temperature, causing a defect in the product. Therefore, there is a need for a new concept of heating equipment to improve this process.

Accordingly, an object of the present invention is to enable a mold for forming a precision glass product, such as a CRT, to be quickly heated to a desired temperature in a simple and quick time using a high-frequency induction heat principle.

In addition, the optical sensor protected by the protective glass is installed in the heating furnace to irradiate the infrared rays with the mold to be heated to analyze the spectrum of the reflected infrared beam to detect the correct temperature, and then input it to the controller, In comparison, the heating is continued until the temperature of the mold reaches the set temperature, and when the heating temperature of the mold approaches the desired temperature, the heating is gradually performed so as not to exceed the desired temperature.

In addition, by installing an overheat prevention sensor connected to the control unit in the upper part of the heating furnace, when the mold is overheated due to a failure or malfunction of the optical sensor, the alarm is cut off and the high frequency induction power supplied to the work coil is cut off while heating. It aims to protect the furnace body and the heated object.

In addition, it is intended to install a protective tube inserted loosely in the lower part of the frame and then to connect the end of the chain connected to the rod of the air cylinder so as not to be separated from the chain sprocket when the chain moves.

In addition, the heating furnace wraps the work coil in which the coolant is circulated between the inner and outer plates filled with insulation and excellent heat resistance and strength in a loop shape to form a closed circuit, and then electrically connects the high frequency feeder of the high frequency oscillator to the inner plate. In order to secure the cap blade plate made of a non-ferrous metal plate with a fastening means, the cap blade plates are spaced apart from each other to prevent contact and deformation due to thermal expansion and the resulting electrical short (short).

In addition, the work coil installed in the heating furnace is aimed to maintain the interval (pitch) of the work coil in a pair of spaces in which a semicircular groove is formed.

In addition, the work coil is composed of a copper tube or copper pipe, but the connecting portion is extended to the end of the work coil or the end of the elbow formed of the copper tube or copper pipe by burring, and then inserted by force fitting to maintain watertightness and conductivity. The purpose.

In order to achieve the above object, a high frequency oscillator generating a high frequency for induction heating and supplying it to a work coil, and a heating furnace capable of induction heating a mold into which a work coil is embedded, Lifting mechanism for raising and lowering the heating furnace, balance device for maintaining stable balance and lifting movement of the heating furnace, optical sensor for detecting the heating temperature of the mold in a spectrum, and preventing overheating of the heating furnace (8). The overheat prevention sensor and the reference temperature set in the control unit and the temperature detected by the light sensor are compared to compensate the temperature by the feedback control method while heating the heating target object to a desired temperature, and when the heating element is overheated, it is supplied to the work coil. It consists of a control unit that cuts off high frequency power and a pallet that supports the mold to quickly heat the heated object such as the mold to a desired temperature. Standing easily allows you to induction heating (induction heat).

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1-Front view of the present invention.

Figure 2-Overall plan view of the present invention.

Figure 3-Top view of the main parts of the present invention.

Figure 4-Cross section view of the present invention.

Figure 5-side view of the heating furnace in a lower state in the present invention.

6 is a side view of a heating furnace in a raised state in the present invention.

7 is a partial cross-sectional view of a heating furnace in a state where a mold is inserted in the present invention.

8 is a longitudinal cross-sectional view of a part of a heating furnace in which a mold is inserted in the present invention.

9-an exploded perspective view of a part of the heating furnace of the present invention.

10 is a plan view of the connection state of the connection portion of the work coil of the present invention.

11-A partial cross-sectional view of the heating furnace of the present invention.

<Explanation of symbols for the main parts of the drawings>

(2)-mould (4)-high frequency oscillator

(6)-work coil (8)-heating furnace

(8a)-top plate of heating furnace (8b)-heating chamber

(10)-Balance (12)-Optical sensor

(14)-Overheat Protection Sensor (16)-Control Section

(18)-Pallet (20) (20a)-Horizontal Frame

(22)-Servant Frame (24)-Expectation

(26)-Drive Shaft (28)-Drive Shaft

(30)-Axle Bearing (32) (32a) (34) (34a) (36)-Chain Sprocket

(38) (38a) (38b) (38c) (44) (44a)-Guide

(40) (40a) (40b) (40c) (48) (48a) (94)-wheel

(42) (42a) (42b) (42c)-Axle (50)-Air cylinder

(50a) (50b)-Upper and Lower limit switch (52)-Load of air cylinder

(54)-Weight (56)-Protector

(58) (60) (60a)-Chain (62)-Protective Glass

(64) (64a) (70) (70a)-plate (66) (66a) (66b) (92)-insulation

(68)-Outer Plate (72)-Inner Plate

(74)-Water Cooling Room (76)-Feeder Line

(78)-Elbow (80)-Motherboard

(82)-Piece (Bolt) (84) (86)-Space

(84a) (86a) -semicircle groove (88)-block

(90)-Steel Plate (96)-Transport Truck

(98)-footrest (100)-foot

The present invention is a high frequency to the temperature (500 ℃ ~ 600 ℃) effectively required within the shortest time within the range that the mold (2) is not affected by the temperature when the mold (2) is instantaneously heated, the deformation does not occur Induction heating will be possible.

Mold heating apparatus of the present invention is a high-frequency oscillator (4) and the work coil (6) having a large-capacity high-frequency oscillator for generating high-frequency (1 ~ 40 kHz) power for induction heating to the work coil (6) A heating furnace 8 in which a heating chamber 8b is formed so as to inductionly heat the mold 2, which is a heating object, and a lifting mechanism for elevating the heating furnace 8 to inject and take out the heating object; Balanced (10) device to maintain a stable lifting motion of (8), an optical sensor (12) for detecting the heating temperature of the mold (2) spectrum and overheating of the heating furnace (8) Compensation control of the temperature of the object to be heated by the feedback control method by comparing the reference temperature set in the control unit with the reference temperature set in the control unit and the temperature detected by the optical sensor 12 to prevent the overheated object is overheated The control unit 16 for cutting off the high frequency power supplied to the coil 6 and the mold 2 for supporting The pallet 18 is large.

The drive shaft 26 and the driven shaft 28 are installed in parallel with the shaft bearing 30 at the center and the rear of the upper surface of the base 24 composed of the horizontal frames 20, 20a and the vertical frame 22, and Chain sprockets 32, 32a, 34 and 34a are respectively fixed to both ends of the drive shaft 26 and the driven shaft 28, and the protruding ends of the drive shaft 26 which protrude more than the driven shaft 28 are also fixed. Insert the chain sprocket 36 into place.

Guide rods 38, 38a, 38b and 38c are installed vertically on both sides of the base 24 before and after the base 24, and the wheels 40 on both sides of the outer surface of the heating furnace 8 before and after. Guide bars 38 to which the wheels 40, 40a, 40b and 40c are in contact by fixing the shaft rods 42, 42a, 42b and 42c provided with the shafts 40a, 40b and 40c. (38a) (38b) (38c) to make a rolling motion, and a pair of guide rods (44) (44a) are also installed vertically on both sides of the rear end of the base (23) as shown in FIG. A pair of wheels 48 and 48a are also installed on both sides, and then contacted with the guide rods 44 and 44a to allow rolling motion.

The wheels 40, 40a, 40b, and 40c provided on the front and rear outer surfaces of the heating furnace 8 are installed on the upper and lower parts of the heating furnace 8 and lifted up as shown in FIGS. It is to prevent the flow of the heating furnace (8).

The air cylinder 50 is installed vertically on one side of the base 24 so that the rod 52 can be sunk upward, and the chain 58 is connected to the rod 52 of the air cylinder 50. The drive shaft 26 rotates forward or reverse as the rod 52 is mounted on the chain sprocket 36, and the piston is moved on the upper and lower surfaces of the air cylinder 50 as shown in FIGS. 6 and 7. The upper and lower limit switches 50a and 50b for sensing are provided to determine the number of strokes (upper limit and lower limit) at which the piston can move and the lifting distance of the heating furnace 6 accordingly.

6 and 7, the protective tube 56 is inserted into the lower weight of the horizontal frame 20a loosely inserted as shown in Figs. 6 and 7, and then the end of the chain 58 connected to the rod 52 54) so that the chain sprocket 36 does not leave when the chain 58 moves.

Further, the chains 60 and 60a are hooked and installed on the sprockets 32, 32a, 34 and 34a of the drive shaft 26 and the driven shaft 28, and then one side end of the chains 60 and 60a is provided. It is fixed to both sides of the upper plate 8a of the heating furnace 8, and the other ends of the chains 60 and 60a are fixed to both sides of the upper surface of the balance 10 so that the drive shaft 26 is moved by the air cylinder 50. When the clockwise rotation rotates forward, the heating furnace 8 rises. On the contrary, when the driving shaft 26 rotates counterclockwise, the heating furnace 8 descends.

The balance 10 which interlocks with the heating furnace 8 is equal to or almost the same as the weight of the heating furnace 8 so that the lifting movement of the heating furnace 8 is naturally performed, and the air cylinder 50 Reduce the load of 負荷.

In addition, the temperature of the mold 2 and the state of the mold 2 can be managed in a state where the temperature of the mold 2 exceeds 500 ° C. by the high frequency induction heating, and the internal observation of the heating furnace 8 in which the mold 2 is located is impossible. Therefore, when the current temperature is fed back using the infrared precision optical sensor 12, the control is performed at the set temperature in comparison with the preset reference temperature in the controller 16.

7 and 8 are cross-sectional views of the heating furnace 8 in which the optical sensor 12 and the overheat prevention sensor 14 of the present invention are installed, and the optical sensor 12 protected by the protection glass 62 is a mold that is a heating body ( 2) to analyze the spectrum of the reflected infrared beam by irradiating the infrared rays to detect the correct temperature, the detected temperature is input to the control unit 16 embedded in the high frequency oscillator (4) is a reference set in advance in the control unit 16 The heating may be continued until the temperature of the mold 2 reaches the set temperature in comparison with the temperature.

At this time, when the heating temperature of the mold 2 is set to 500 ° C, it is preferable that the heating temperature is gradually heated just before the temperature of the mold 2 to approach 500 ° C so that the heating temperature does not exceed the set 500 ° C. .

On the other hand, the overheat prevention sensor 14 is installed on the upper part of the heating furnace 8 so that the overheat prevention sensor 14 is overheated when the mold 2 overheats due to a failure or malfunction of the optical sensor 12. Since the detection and transfer to the control unit 16, the control unit 16 to protect the mold (2) and the heating furnace (8) by blocking the high frequency induction power supplied to the work coil (6) at the same time as the alarm.

On the other hand, the mold (2) must maintain a temperature distribution within a certain temperature, the deviation occurring between the mold (2) regardless of the upper and lower parts must meet the fine tolerance range.

Therefore, when the mold 2 is heated quickly by applying a large amount of energy in a short time, the shape of the mold 2 is partially different, and the distribution of heating energy is also different, thereby increasing the risk of thermal deformation. Through the special design of (6), it is possible to endure in high temperature environment in order to make the heating distribution degree as much as possible, to support and protect the work coil 6 over 500 ° C for a certain time, and to suppress the temperature drop of the mold 2. The heating furnace 8 is made of nonferrous or nonmetallic material.

The heating chamber 8b for heating the injected mold 2 and the heating furnace 8 through which the mold 2 can enter and exit the opened lower portion are a pair of plate members 64 and 64a as shown in FIGS. 7 to 11. It consists of an outer plate 68 filled with a heat insulating material 66 therebetween, and an inner plate 72 filled with a heat insulating material 66a between a pair of plate materials 70 and 70a. Between 68) and 72, the work coil 6 in which the coolant is circulated is rolled around in a loop to form a closed circuit, and then electrically connected to the high frequency feed line 76 connected to the high frequency oscillator 4 to heat the heating body 8. Induction heating of the mold 2 located at the center of the inner surface of the mold 2 is performed, and a heat insulating material 66b is filled between the inner and outer plates 68 and 72 to achieve thermal insulation of the heating furnace 8.

The outer plate 64 constituting the outer plate 68 is to use a high strength epoxy, the inner plate 64a of the outer plate 68 and the inner and outer plate 70 of the inner plate 72 ( 70a) is to use a ceramic board having excellent heat resistance and high strength, and the heat insulating material 66, 66a, 66b is preferably to use a heat insulating material of a material having excellent heat resistance and heat insulating effect, such as glass fiber.

The work coil 6 installed in the heating furnace 8 does not need to be installed in the lower portion of the open heating furnace 8 and the upper portion of the heating furnace 8, and the heating furnace 8 using the elbow 78. You can install it around the wall of the wall.

The work coil 6 is composed of a copper tube or a copper pipe, but when connecting the connection portion, the end of the work coil 6 or the end of the elbow 78 is expanded by burring, and then the elbow 78 and the work as shown in FIG. The coil 6 is inserted by force to maintain watertightness, and the water cooling chamber 74 of the work coil 8 is forced to circulate the cooling water with a circulation pump (not shown) to protect the work coil 8 from high heat. do.

The circulation pump is embedded in the middle or inlet portion of the high frequency feed line 76 or the high frequency oscillator 4 to force the cooling water to be circulated.

In addition, the inner plate material 70a of the heating furnace 8 is brought into contact with the hat plate 80 made of a non-ferrous metal plate such as stainless steel, and then fastened by fastening with a bolt or piece 82 to fix the heat and electricity of the heating furnace 8. Prevent shorts.

Since the hat blade plate 80 is thermally expanded by the internal temperature of the heating furnace 8, adjacent hat blade plates 80 are spaced apart by about 10 mm to 20 mm, and the contact between the hat blade plates 80 and the deformation according to the contact. And to prevent electrical shorts.

The bolt or piece 82 fixing the cap blade 80 in the above also uses a non-ferrous metal material to prevent heating of the bolt or piece 82 and to reduce power loss due to heating.

In addition, the work coil 6 installed in the heating furnace 8 around the work coil 8 uses a pair of spaces 84 and 86 having semicircular grooves 84a and 86a formed thereon as shown in FIG. 9. Keep the interval (pitch) of the.

In the present invention, the pallet 18 which raises and supports the mold 2 introduced into the heating furnace 8 to a height at which the work coil 6 is located is minimized as shown in FIGS. 2, 5, and 6. A plurality of blocks 88 supporting (2), a steel plate 90 supporting the block 88, and a footrest 98 of a carriage 96 having a heat insulating material 92 and a wheel 94 are inserted. It is composed of the supporting plate 100, the steel sheet 90 is composed of a non-ferrous metal such as stainless, so as to suppress the heat loss to the maximum by the heat insulating material 92 located in the lower portion of the steel sheet (90).

Reference numeral 102 is a start switch, 104 is a stop switch, 106 is a rise switch, 108 is a down switch, 108 is a chain fixture, 110 is a bracket, 112 is a high frequency feed It is a terminal.

According to the present invention configured as described above, the mold heating apparatus of the present invention is operated by pressing the start switch 102 while the high frequency oscillator 4 is operated, and pressing the lift switch 106 to load the rod 52 of the air cylinder 50. ) Will rise.

Therefore, since the chain sprocket 36 rotates forward clockwise, the heating furnace 8 lowered as shown in FIG. 5 by the chains 60 and 60a connecting the drive shaft 26 and the driven shaft 28 is moved. Ascend and the balance 10 is lowered.

On the other hand, since the piston 52 is stopped by the upper limit switch 50a, the rod 52 that is continuously rising stops rotation of the drive shaft 26 and the driven shaft 28, and the heating furnace 8 that has been raised is shown in FIG. It will stop together.

The weight 58 is prevented from being separated or peeled off by the weight 54 connected to the end of the chain 58, the weight 54 is installed inside the protective tube 56, and as a result of the lifting It is prevented, and detachment or peeling of the chain 58 by the flow is prevented.

In addition, the balance between the heating furnace 8 and the balance 10 is maintained by the balance 10 connected to the ends of the chains 60 and 60a when the drive shaft 26 is rotated by the air cylinder 50. In addition, the rising heating furnace 8 is smoothly raised by a plurality of wheels 40, 40a, 40b and 40c and vertical guide rods 38, 38a, 38b and 38c provided on both sides. Since the balance 10 is also clouded by a pair of wheels 48 and 48a and guide rods 44 and 44a, the load on the air cylinder 50 is greatly reduced.

On the other hand, in the state in which the heating furnace 8 is raised, the pallet 18 which consists of the block 88, the steel plate 90, the heat insulating material 92, etc. is mounted on the scaffold 98 of the transport trolley 96, and the pallet ( 18) Load a plurality of molds (2) to be heated on the top, and then moved to the lower portion of the heating furnace (8) to separate the transport cart 96, and then press the lower switch 108, the rod 50b of the air cylinder (50) ) Will descend.

Therefore, since the chain sprocket 36 rotates counterclockwise, the heating furnace 8 which has been raised as shown in FIG. 6 by the chains 60 and 60a connecting the drive shaft 26 and the driven shaft 28. Is lowered and the balance 10 is raised.

On the other hand, since the piston 52 is stopped by the lower limit switch 50b, the rod 52 that is continuously lowered stops the rotation of the drive shaft 26 and the driven shaft 28, and the heating furnace 8 that is lowered is As described above, the plurality of molds 2 are stopped and lowered, and the plurality of molds 2 introduced through the opening of the heating furnace 8 are positioned in the heating chamber 8b as shown in FIGS. 7 and 8.

When the high frequency power produced by the high frequency oscillator 4 is supplied to the work coil 6 through the feed line 76 in the above state, the high frequency power is guided to the mold 2 so that the mold 2 is heated. The mold 2 is rapidly heated until the desired temperature set in the controller 16 is reached, and the optical sensor 12 protected by the protection glass 62 is irradiated with infrared rays by the mold 2, which is the object to be heated, to be reflected. By analyzing the spectrum of the infrared beam to detect the correct temperature, the detected temperature is input to the control unit 16 embedded in the high frequency oscillator 4 and compared with the reference temperature preset in the control unit 16 of the mold (2) Heating continues until the temperature reaches the set temperature.

At this time, when the heating temperature of the mold 2 is set to 500 ° C, when the temperature of the mold 2 to be heated approaches 500 ° C, the heating is gradually performed, so that the heating temperature does not exceed the set 500 ° C.

In addition, since the overheat prevention sensor 14 is installed on the upper part of the heating furnace 8, when the mold 2 overheats due to a failure or malfunction of the optical sensor 12, the overheat prevention sensor 14 is overheated. This is sensed and transmitted to the controller 16, and the controller 16 blocks the high frequency induction power supplied to the work coil 6 at the same time as the alarm, thereby protecting the mold 2 and the heating furnace 8.

In addition, the ambient temperature of the heating chamber 8b increases according to the heating of the mold 2, but the heat loss is reduced because the heat insulation is maintained by the heat insulating materials 66, 66a, 66b, and the inner plate 72. Since the inner blade 70 of the non-ferrous metal plate is attached to the inner blade member 70, the heat resistance of the inner and outer plate members 70 and 70a is greatly improved.

Since the hat blade 80 is composed of a non-ferrous metal plate such as stainless steel does not interfere with the induction heating, the hat blade 80 and the hat blades 80 are somewhat spaced apart from the thermal expansion of the hat blades 80 from the thermal expansion Contact or deformation is prevented, and electrical shorts due to contact are prevented.

In addition, the work coil 6 installed in the heating furnace 8 in a circular manner is formed by the pair of spaces 84 and 86 formed with the semicircular grooves 84a and 86a as shown in FIG. Since the interval (pitch) is maintained, the induced power is evenly transmitted to the mold (32).

On the other hand, the mold 2 should maintain a temperature distribution within a certain temperature, and the deviation between the molds 2 should meet the fine tolerance range regardless of the upper and lower parts, and apply a large output energy in a short time. When the mold 2 is quickly heated, the shape of the mold 2 is partially different, and the distribution of heating energy is also different, thereby increasing the risk of thermal deformation. However, in the present invention, the special design of the heating furnace 8 and the work coil 6 is performed. The heating distribution is maintained as evenly as possible.

That is, the outer plate 64 constituting the outer plate 68 uses high strength epoxy, and the inner plate 64a of the outer plate 68 and the inner and outer plate 70 and 70a of the inner plate 72. ) Uses a non-ferrous or non-metal ceramic board having excellent heat resistance and high strength, and the heat insulating material 66, 66a, 66b uses a heat insulating material made of a material having high heat resistance and heat insulating effect such as glass fiber, and thus has a value of 500 or more. It protects while supporting the work coil 6 over degreeC, and the temperature fall of the metal mold | die 2 is suppressed.

In addition, the elbow 78 formed of the copper tube or the copper pipe is forcibly inserted into the connection portion of the work coil 6 composed of the copper tube or the copper pipe to maintain the watertightness and conductivity, and the work coil 8 ), The water cooling chamber 74 forcibly circulates the cooling water with a circulation pump (not shown), thereby protecting the work coil 8 from high heat.

On the other hand, when the heating of the mold 2 is completed, as described above, the heating furnace 8 is stopped and lifted up, and then the hardened mold 2 is pulled out using the transport trolley 96 and moved to the molding apparatus. The cathode ray tube may be molded, and a new mold to be heated may be moved to the transport cart 96 and repeatedly heated.

In the present invention, a mold for manufacturing a cathode ray tube is used as the heating object, but of course, other molds requiring heating can be heated, and the action and effect thereof are identified with the present invention.

As described above, in the present invention, since the conventional mold heating apparatus is indirectly heated by an electric heater, not only the heating space is large, but also a large amount of heat loss and power consumption, and the initial heating time also takes more than 3 hours to prepare for the mold heating. There is a problem that the productivity is lowered, but the present invention directly heats the mold using the principle of high-frequency induction heat, so the power consumption can be significantly reduced to 1/10 by the efficient use of heat. As the volume of the heating device is small, the heating space can be greatly reduced, and the initial heating time of the mold is also greatly reduced to several tens of minutes, thereby greatly improving productivity.

In addition, the mold heating apparatus of the present invention can quickly and easily shorten the moving distance of the mold, so that the glass panel (or funnel) can be molded into a heated mold without a large error.

On the other hand, when it is a standard that maintains the same characteristics of the mold as it is heated in the existing mold heating equipment, the characteristics are classified into three types. First, the heating time is only about 1/6 of the existing equipment. Second, the power cost is significantly reduced, and third, the equipment dead time is reduced to less than one third, and in addition, it is a very useful invention that has the effect of simple operation and no need for preheating.

Claims (4)

A work coil wound around the heating object, a high frequency oscillator for induction heating of the heating object by supplying high frequency power to the work coil, and a temperature installed around the mold to maintain the heating temperature of the mold by controlling the high frequency power. A mold heating apparatus using a high frequency induction heating principle configured to sense heat to quickly heat a heated object to a desired temperature; Lower open heating furnace for induction heating of the heated object to which the work coil is installed and installed, a lifting mechanism for elevating the heating furnace, and a balancing device for maintaining a stable lifting motion and balance of the heating furnace. And mold heating using a high frequency induction heating principle, comprising: an optical sensor for detecting the heating temperature of the mold in a spectrum, an overheat prevention sensor for preventing overheating of the heating furnace 8, and a controller thereof. Device. The drive shaft 26 and the driven shaft 28 on which the chain sprockets 32, 32a, 34, 34a, 36 are fixed are installed in parallel to the upper portion of the base 24, and the base ( Vertical guide rods 38, 38a, 38b and 38c are provided on both sides of the front and rear sides of the 24, and guide rods 38, 38a and 38b on both sides of the outer surface of the heating furnace 8 before and after. The wheels 40, 40a, 40b, and 40c which are rolling along the 38c are axially mounted, and a pair of vertical guide rods 44 and 44a are provided on both sides of the rear end of the base 23. The wheels 48 and 48a of the pair are rolled, and the chains 60 and 60a are mounted on the sprockets 32, 32a, 34 and 34a of the drive shaft 26 and the driven shaft 28. One end of the chain 60 (60a) is fixed to the upper plate (8a) of the heating furnace 8, the other end of the chain 60 (60a) is fixed to the upper surface of the balance 10, The air cylinder 50 is vertically installed on one side of the base 24 to allow the rod 52 to be lifted upward, and the chain 58 having the weight 54 to the end of the rod 52 is connected. The drive shaft 26 rotates forward and backward as the rod 52 is mounted on the in sprocket 36, and upper and lower limit switches 50a and 50b are provided on the upper and lower surfaces of the air cylinder 50. Mold heating apparatus using the high frequency induction heating principle, characterized in that to set the stroke of the rod (52). The heating furnace (8) according to claim 2, wherein the heating furnace (8) is provided between an outer plate (68) filled with a heat insulating material (66) between a pair of plate (64) (64a), and a pair of plate (70) (70a). It consists of an inner plate 72 filled with a heat insulating material 66a, and wraps the work coil 6 in which the cooling water is circulated in a loop form between the inner and outer plates 68 and 72 to form a closed circuit. A mold heating apparatus using the high frequency induction heating principle, which is electrically connected to the high frequency feed line (76) of the oscillator (4) and filled with a heat insulating material (66b) between the inner and outer plates (68, 72). The non-ferrous metal hat plate 80 is brought into contact with the inner plate member 70a of the heating furnace 8, and then fastened by a piece and fixed thereto, but adjacent hat plate plates 10 mm to 20 are in contact with each other. Mold heating apparatus using the high frequency induction heating principle, characterized in that spaced apart by mm.