KR101607465B1 - Induction Heating system for Heating-bolt and Control Method Thereof - Google Patents

Induction Heating system for Heating-bolt and Control Method Thereof Download PDF

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Publication number
KR101607465B1
KR101607465B1 KR1020160005912A KR20160005912A KR101607465B1 KR 101607465 B1 KR101607465 B1 KR 101607465B1 KR 1020160005912 A KR1020160005912 A KR 1020160005912A KR 20160005912 A KR20160005912 A KR 20160005912A KR 101607465 B1 KR101607465 B1 KR 101607465B1
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KR
South Korea
Prior art keywords
heating
bolt
temperature
unit
power
Prior art date
Application number
KR1020160005912A
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Korean (ko)
Inventor
강문수
강병관
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디아이케이(주)
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Priority to KR1020160005912A priority Critical patent/KR101607465B1/en
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/101—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00—Thermometers specially adapted for specific purposes
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/18—Status alarms
    • G08B21/182—Level alarms, e.g. alarms responsive to variables exceeding a threshold
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B3/00—Audible signalling systems; Audible personal calling systems
    • G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B5/00—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied
    • G08B5/22—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission
    • G08B5/36—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission using visible light sources
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/023—Industrial applications
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/07—Heating plates with temperature control means

Abstract

The present invention relates to an induction heating system for a heating bolt. The induction heating system includes: a heating bolt which is in the shape of a hollow cylinder tube having screw threads respectively formed on the outer peripheral surfaces of both ends to couple a first coupling unit and a second coupling unit facing each other while having installation holes formed on the inner center in a longitudinal direction; a heating unit which is inserted into the installation holes in the longitudinal direction of the heating bolt, selectively heats the heating bolt through induction heating, and changes the elongation rate of the heating bolt to compress or stretch the heating bolt in accordance with a temperature change; and a temperature sensor unit which is arranged near the heating unit to sense the temperature of each section set in the area being heated by the heating unit.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating system for a heating bolt,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating system for heating bolts and a control method thereof, and more particularly to a heater fastening apparatus for heating a heating bolt through dielectric heating or induction heating using a high frequency electromagnetic field.

Large turbines, high-pressure valves, and internal combustion engines used in power plants and various industrial plants are tightened using heating bolts.

Such a heating bolt is a bolt member having a hollow shape and is heated and stretched through an induction heater or the like during fastening or detachment thereof in order to maintain a sufficient coupling force in a large turbine or the like operated at high temperature or high pressure.

The amount of heating bolts heated is a very important factor for the heating bolts to maintain proper bonding force. If the heating bolts are excessively heated or stretched too little, they may be damaged due to heating bolt breakage, casing deformation, loosening of the nut, It may cause problems such as poor bonding performance.

The induction heater used to extend the heating bolt is called a radio heater in such a way that an object is placed in a strong electromagnetic field.

The high-frequency heating method includes dielectric heating (induction heating) and induction heating (induction heating).

Here, dielectric heating is a principle in which an object to be heated is placed in a high-frequency electric field to cause heat loss due to dielectric loss of the dielectric material. Induction heating is a method in which, when an electric good conductor is placed in a high frequency magnetic field, Or by self-heating due to loss of hysteresis.

This type of dielectric heating method can be applied to the drying and bonding of wood, the vulcanization of rubber, the molding of synthetic resin, the bonding of vinyl film (high frequency bonding), the drying of fibers, the processing of bamboo products, (Microwave oven) and so on. Generally, the higher the frequency, the higher the calorific value. However, since the heated body is not heated evenly, the frequency used ranges from several KHz to several GHz depending on the object to be heated. There are flat electrode, lattice electrode and coaxial electrode for the high-frequency electrode, and a cavity resonator when the frequency is high. This heating method is characterized in that even if the insulator having a low thermal conductivity is an object to be heated, the efficiency of the object to be heated is good due to the heat generated by the object to be heated, and the desired portion can be selected and heated.

In addition, the induction heating method is used for melting, quenching, annealing, welding, brazing, and forging of a metal alloy, and for producing a molten refined single crystal of germanium or silicon in the semiconductor industry. As the frequency increases, the eddy current flows only on the surface of the conductor and does not penetrate into the inside of the conductor. Therefore, a relatively low frequency is used for melting and a relatively high frequency is used for heating only the surface such as metal surface quenching . This heating method is characterized in that a metal having a high thermal conductivity can be locally heated or melted, and a metal melting with high purity is performed in a vacuum.

Therefore, when the heating bolt is heated by the induction heating method, the heating bolt can be easily heated and the heating time can be shortened, so that it is advantageous that the heating bolt fastened to the large plant can be easily fastened or detached.

However, it is difficult to accurately measure the temperature of the heating bolt according to the set interval of the heating bolt while heating the heating bolt through the high frequency induction heating apparatus, so that it is pointed out that the stress or elongation due to the physical properties of the heating bolt changes .

Therefore, it is difficult to measure the deformation of the physical properties such as the tensile strength and the yield strength as the heating bolts are locally overheated in the heating process only when the heating bolts are stretched according to the elongated amount of the heating bolts. Therefore, There are problems such as occurrence of a safety accident by reusing the bolt, or serious damage to the entire plant.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and more particularly, it is an object of the present invention to provide a heating bolt which is capable of preventing a local physical property from being deformed by measuring the temperature of a heating bolt heated in the heating bolt, And an object of the present invention is to provide an induction heating system for a heating bolt and a control method thereof that can prevent a safety accident or an industrial disaster from occurring due to heating and uniformity of the elongation rate.

According to an aspect of the present invention, there is provided a hollow pipe having a hollow pipe shape, wherein threaded portions are formed on outer circumferential surfaces of both end portions to fasten first and second fastening portions opposed to each other, A heating bolt formed therein; A heating unit inserted into the installation hole along the longitudinal direction of the heating bolt and selectively heating the heating bolt through induction heating to change an extension ratio of the heating bolt to be tensioned or compressed in accordance with a temperature change, And a temperature sensor unit disposed around the heating unit and sensing a set temperature of the region heated by the heating unit.

The temperature sensor unit may include a plurality of sensor members formed in a unit length so as to sense the temperature of each of the predetermined intervals according to the length of the installation hole.

The sensor members may be disposed at equal intervals along the longitudinal direction inside or outside the installation hole.

The sensor member may be formed of a non-metallic optical fiber.

The induction heating system for heating bolts may further include a control unit for receiving data from the temperature sensor unit and controlling the heating unit.

The control unit may control to shut off the power supply to the heating unit when any one of the set temperatures of the heating bolts exceeds the set temperature based on data provided from each of the sensor members.

The control unit may include an alarm unit for notifying power of the heating unit and recognizing the power of the heating unit in a visual or auditory sense when the temperature of one of the zones exceeds the set temperature.

According to another aspect of the present invention, there is provided a method of manufacturing a heating bolt, comprising the steps of: inputting information on size, material, strength, and elongation according to a type of a heating bolt to be fastened; Heating the heating bolt through the heating unit based on the input information of the heating bolt; A temperature measuring step of measuring a temperature for each section set through a temperature sensor arranged along a longitudinal direction in an internal installation hole of the heating bolt and a step of controlling the heating unit through a control unit in response to a temperature change of the heating bolt And a control method of the induction heating system for a heating bolt.

The controlling of the heating unit may include adjusting the temperature of the heating bolt to a predetermined heating temperature by adjusting at least one of a time, a temperature, a current, a voltage and a frequency of heating the heating bolt through the control unit, An adjustment step.

The temperature control step may reduce the power output of the heating unit or cut off the power so as to prevent at least one of the tensile strength, the yield strength and the elongation of the heating bolt from exceeding the set range by overheating.

The step of controlling the heating unit may include an alarm step of informing the operator of the fact that the power of the heating unit is cut off.

According to the present invention, there is provided an induction heating system for a heating bolt,

First, since fastening or detaching is performed by heating, the first binding port and the second binding port can be firmly coupled,

Second, it is possible to prevent a safety accident from occurring due to a strong coupling force, prevent industrial disasters from occurring,

Third, since the internal temperature of the heating bolt can be grasped accurately, it is expected that the heating bolt can be uniformly and quickly heated within a range that does not deform the physical properties of the bolt.

1 is a schematic view showing an induction heating system for a heating bolt according to the present invention.
2 is a side view showing a side view of the induction heating system for the heating bolt shown in Fig.
Fig. 3 is a sectional view showing the first binding portion and the second binding portion into which the heating bolt shown in Fig. 1 is inserted. Fig.
4 is a perspective view showing a heating part and a temperature sensor part inserted into the heating bolt shown in FIG.
5 is an enlarged perspective view of sensor members of the temperature sensor unit shown in Fig.
6 is a block diagram showing a control method of the induction heating system for a heating bolt of the present invention.
7 is a flowchart showing a control method of the induction heating system for a heating bolt of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It should be noted that the drawings denoted by the same reference numerals in the drawings denote the same reference numerals whenever possible, in other drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. And certain features shown in the drawings are to be enlarged or reduced or simplified for ease of explanation, and the drawings and their components are not necessarily drawn to scale. However, those skilled in the art will readily understand these details.

FIG. 1 is a reference view schematically showing an induction heating system for a heating bolt according to the present invention, and FIG. 2 is a side view showing a side view of an induction heating system for a heating bolt shown in FIG.

1 and 2, an induction heating system for a heating bolt according to the present invention includes an inverter body 110, a cooling unit 120, and a cooling unit 120. The induction heating system includes induction heating, A heating bolt 150 for heating the first binding part and the second binding part substantially through heating through the heating part 130 and a control part for controlling the temperature applied to the heating ball 130 .

Therefore, when power is supplied from the inverter main body 110 at an appropriate voltage and current, the power is transmitted to the cooling unit 120 through the power cable 10. Power is supplied through a heating coil (not shown) in the heating unit 130 connected to the cooling unit 120, and a water-cooling type cooling operation is performed through a cooling pipe (not shown). The cooling unit 120 also includes a function for cooling the inverter main body 110.

Although not shown in the figure, a power supply unit for controlling the power supplied from the outside to the inverter main body 110 is provided in the inverter main body 110. The power supply unit supplies the current and voltage suitable for induction heating and also provides the ability to generate the appropriate frequency.

In addition, the inverter main body 110 is provided with a controller 160 for controlling the current, voltage, frequency, reactive power, and the like. The controller 160 controls the output of the induction heating system to control the heating unit 130 to operate at a uniform temperature and also provides a function of preventing overheating.

Therefore, the heating bolt 150 can be extended in a short time by the power supplied to the heating unit 130, and it is possible to reduce time and cost due to disassembly or assembly due to fastening or removing .

A coupling hole 111 is formed in the inverter main body 110 at one side. The coupling hole 111 is formed inwardly from one side of the inverter main body 110 and the coupling portion 20 is disposed inside the coupling hole 111.

The cooling unit 120 may have the same structure as that of the engaging portion 20. Therefore, the power cable 10 or the heating unit 130 is coupled by the coupling unit. At this time, a bus bar 131 is coupled to one end of the power cable 10 and the heating unit 130, inserted into the coupling unit, and the coupling unit is rotated down and fixed by pressing. Therefore, the power cable 10 and the heating unit 130 are selectively coupled to each other so that they can be attached and detached.

Reference numeral 11 in FIG. 1 has the same function as the power cable 10.

FIG. 3 is a sectional view showing a first binding part and a second binding part in which the heating bolt shown in FIG. 1 is inserted, FIG. 4 is a perspective view showing a heating part and a temperature sensor part inserted into the heating bolt shown in FIG. 3 And FIG. 5 is an enlarged perspective view of the sensor members of the temperature sensor unit shown in FIG.

3 to 5, the induction heating system 100 for a heating bolt of the present invention has a hollow circular pipe shape and has first and second fastening portions 30 and 30, A heating bolt 150 having an attachment hole 151 formed at an inner center thereof along a longitudinal direction and a fixing bolt 150 inserted into the installation hole 151 along the longitudinal direction of the heating bolt 150 A heating unit 130 that selectively heats the heating bolt 150 through induction heating and changes an extension ratio of the heating bolt 150 so as to be tensioned or compressed according to a temperature change, A temperature sensor unit 140 disposed in the heating unit 130 for sensing a temperature of a predetermined region of the heated region 130 and a controller 130 for receiving data from the temperature sensor unit 140 and controlling the heating unit 130 And a control unit (refer to FIG. 1).

As shown in Fig. 3, the first binding portion 30 and the second binding portion 40 may correspond to, for example, a main body and a cover (casing) of a large turbine. Therefore, the first binding portion 30 and the second binding portion 40, which must be firmly coupled by using the heating bolt 150, are fastened.

The booster bar 131 is coupled to the inverter body 110 or the cooling unit 120 at one end of the heating unit 130. Although not shown in the drawing, a flow path through which the cooling fluid supplied from the cooling unit 120 is circulated is formed inside the heating unit 130, and a high-frequency current supplied from the inverter main body 110 is received, And a heating coil for performing induction heating in the heating bolt 150 is provided. Here, the heating unit 130 induction-heats the heating bolt 150 formed of a metal conductor or the like through a current (alternating current) provided from the inverter main body 110. For example, the heating unit 130 may form a high frequency magnetic field around the heating coil through the supplied current, and the heating coil formed of a metal conductor or the like may generate eddy current loss or hysteresis loss in a high frequency magnetic field, As shown in Fig. The principle of such induction heating is well known in the art, and a detailed description thereof will be omitted.

As shown in FIG. 4, the heating unit 130 is integrally connected to one end and the other end, and a central portion of the heating unit 130 is located inside the heating bolt 150.

The heating unit 130 and the temperature sensor unit 140 are inserted into the mounting hole 151 formed in the heating bolt 150 and the heat generated by the induction heating in the heating unit 130 is heated to the temperature And transmits the measured temperature data sensed by the sensor unit 140 to the controller 160. Of course, the temperature sensor unit 140 may be disposed outside the heating bolt 150. When the temperature sensor unit 140 is disposed outside the heating bolt 150, the temperature of the outer surface of the heating bolt 150 may be measured. Further, when measuring the temperature of the outer surface of the heating bolt 150, the sensor member of the wire may be formed so as to be capable of wireless measurement as well.

At this time, the heating bolt 150 is fastened in a heated state between the first binding part 30 and the second binding part 140, fastened in a state elongated along the longitudinal direction, The length of the heating bolt 150 is reduced and the first binding portion 30 and the second binding portion 40 are fastened together.

As shown in FIG. 5, the temperature sensor unit 140 includes a plurality of sensor members 141 formed in different lengths in the mounting hole 151.

The sensor member 141 is coupled to the heating bolt 150 in a predetermined interval, and provides a function of measuring the temperature of each section.

Accordingly, it is sensed that the region where the heating unit 130 is heated is abnormally overheated or the rate of temperature change is larger or smaller than the other regions, so that the heating bolt 150 can be uniformly heated .

Of course, the sensor members 141 may be disposed at equal intervals in the installation hole 151, and may be disposed at predetermined intervals according to the length or type of the heating bolts 150.

The sensor members 141 are made of a non-metallic optical sensor, and any temperature sensor can be used as long as it is not heated by the induction heating of the heating unit 130.

The control unit 160 controls the heating temperature of the heating unit 130 based on the data received from the temperature sensor unit 140 so that the heating bolt 150 is uniformly heated. The control unit 160 also includes an alarm unit 161 (see FIG. 1) for shutting off the power of the heating unit and informing the power off state when the set interval temperature of the heating bolt 150 exceeds a set range do.

The alarm unit 161 has a function of generating sounds such as a buzzer, a speaker, or a siren so that a worker can visually or audibly recognize a power-off state, a function of emitting a light such as an LED light or a display, Signal.

Also, the controller 160 may adjust the heating condition of the heater 130 separately from the inverter main body 110. At this time, the control unit 160 may be formed to be able to control by radio. In addition, when the controller 160 is disposed adjacent to the heating bolt 150 or can control the heating bolt 150 wirelessly, it is possible to perform the operation while checking the extended state of the heating bolt 150, It is effective.

When the controller 160 receives a set value of at least one of time, temperature, current, voltage, frequency, effective power, reactive power, tensile strength, yield strength, and elongation among conditions for heating the heating unit 130 The database can be constructed so that the set values of the remaining elements are set.

In addition, setting values may be set by manually inputting values of time, temperature, current, voltage, frequency, active power, reactive power, tensile strength, yield strength, and elongation in the conditions for heating the heating unit 130. This is because the setting value can be changed according to the type, size, and material of the heating bolt 150 applied.

Although not shown, the heating bolt 150 or the controller 160 may include an elongation percentage measuring sensor (not shown) for measuring the elongation percentage as the heating bolt 150 is heated and its length is increased. The elongation percentage measuring sensor measures the elongation change amount of the heating bolt 150 and transmits the elongation change amount to the controller 160. The controller 160 adjusts the heating state of the heating unit 130 based on the received data, Or the power of the heating unit 130 is shut off.

Accordingly, since the length of the heating bolt 150 can be prevented from increasing to a predetermined range or more, it is possible to maintain accurate timing of the heating bolt 150 and prevent accidental accident.

Hereinafter, a method of controlling the induction heating system for a heating bolt of the present invention will be described in detail.

FIG. 6 is a block diagram showing a control method of the induction heating system for a heating bolt of the present invention, and FIG. 7 is a flowchart showing a control method of the induction heating system for a heating bolt of the present invention.

6 and 7, a control method (S100) of the induction heating system for a heating bolt of the present invention includes the steps of inputting information on size, material, strength, and elongation according to the type of heating bolts to be fastened (S110) (S120) heating the heating bolt through the heating unit on the basis of the input information of the heating bolt, and measuring a temperature for each predetermined interval through the temperature sensor disposed along the longitudinal direction in the internal mounting hole of the heating bolt And a step S140 of controlling the heating unit through the control unit in response to the temperature measurement step S130 and the temperature change of the heating bolt.

First, in step S110, information about the size such as length, width, and diameter is input according to the type of the heating bolt, and information about the tensile strength, yield strength, yield ratio, and the like is also input. For example, in the case of the heating bolt manufactured as a prefabricated product, such information may be converted into data by setting the kind of the heating bolt in the control unit without inputting it separately.

Through the input information, the control unit distinguishes the heating bolts and limits the upper limit heating temperature based on the information.

Then, the heating bolt is heated through the heating unit (S120).

The step of heating the heating bolts (S120) is performed in a set time, a set temperature, and a set frequency range.

In the temperature measurement step (S130), the temperature sensor measures the temperature of each section of the heating bolt and transmits the measured temperature to the controller. Of course, the temperature measurement step S130 may control the sensor members to transmit the measured temperature in real time or to transmit the measured temperature at the set time.

The step of controlling the heating unit (S140) may include setting the time, temperature, current, voltage, and frequency of heating the heating bolt by the heating unit through the controller based on the data obtained in the temperature measuring step (S130) (S141) adjusting at least one of the heating bolts to a predetermined heating temperature of the heating bolts.

The temperature control step S141 is performed to increase the temperature of the low temperature section in the temperature measuring step S130 and to lower the temperature of the high temperature section. Therefore, there is an effect that the heating bolt can be uniformly heated and prevented from being overheated in a local portion.

In the temperature control step S141, when at least one of the tensile strength, the yield strength, and the elongation of the heating bolt exceeds a predetermined range, the power of the heating unit may be cut off or the power output may be decreased. In addition, the temperature control step S141 includes an alarm step S142 for notifying the operator that the power is turned off when the power is turned off.

Therefore, since the temperature of the heating bolt is uniformly increased, there is no problem in safety even if the heating bolt in a state of being fastened or detached is reused, and safety accident can be prevented in advance.

Further, since the operator can quickly grasp the power-off state of the heating unit, it is possible to shorten the time required to reheat the heating bolt, thereby reducing the maintenance cost.

The flowchart shown in Fig. 7 shows a process of heating the heating bolts.

Where t (n) is the heating time, t (max) is the heating upper limit time, T (n) is the present temperature and T (max) is the maximum heating temperature. DELTA T is a temperature change amount, and DELTA T (max) is a maximum temperature change amount.

Therefore, as described above, information of the heating bolt is input first, and heating is started. At this time, if the heating time t (n) is larger than the heating upper limit time t (max), the stop or alarm proceeds, and if it is smaller, the next step proceeds.

Next, if the present temperature T (n) is larger than the maximum heating temperature T (max), the stop or alarm proceeds, and if it is smaller, the next step proceeds.

Next, the temperature change amount DELTA T of the heating bolt is formed by the difference of the previous measured temperature T (n-1) at the present temperature T (n) and the temperature change amount DELTA T is the difference between the maximum temperature change amount DELTA max)), the alarm of the stop or alarm proceeds, and if it is smaller, the process of measuring the current temperature (T (n)) is repeated.

Of course, it is possible to judge the difference from the set factors including the heating time t (n), the heating temperature T (n) and the temperature variation T, as well as the voltage, current and frequency, Of course.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, . ≪ / RTI > Accordingly, such modifications are deemed to be within the scope of the present invention, and the scope of the present invention should be determined by the following claims.

100: Induction heating system for heating bolts
110: inverter main body 120: cooling unit
130: Heating unit 140: Temperature sensor unit
150: Heating bolt 160: Control unit

Claims (12)

A heating bolt having a hollow circular pipe shape in which threads are formed on outer circumferential surfaces of both end portions to fasten the first binding portion and the second binding portion which are opposed to each other and the mounting hole is formed at the inner center along the longitudinal direction;
A heating unit inserted in the installation hole along the longitudinal direction of the heating bolt and selectively heating the heating bolt through induction heating and changing the extension rate of the heating bolt to be stretched or compressed according to a temperature change;
A temperature sensor disposed in the vicinity of the heating unit to sense a set temperature of the region heated by the heating unit;
Wherein the heating bolt comprises a plurality of heating elements. The method according to claim 1,
The temperature sensor unit,
And a plurality of sensor members formed in a unit length so as to be able to sense the temperature of each section according to the length of the installation hole. The method of claim 2,
Wherein the sensor members are disposed at equal intervals in the longitudinal direction at the inside or outside of the installation hole. The method of claim 2,
Wherein the sensor member is formed of an optical fiber which is not heated by induction heating. [Claim 2]
Further comprising a control unit for receiving data from the temperature sensor unit and controlling the heating unit. The method of claim 5,
Wherein,
Wherein the controller controls to shut off the power supply to the heating unit when the temperature of any one of the predetermined sections of the heating bolt exceeds the set temperature based on data provided from each of the sensor members. The method of claim 6,
Wherein,
And an alarm unit for notifying power of the heating unit and recognizing the power of the heating unit in a visual or audible manner when the temperature of any one of the zones exceeds a preset temperature. Inputting information on size, material, strength, and elongation according to the type of heating bolts to be fastened;
Heating the heating bolt through the heating unit based on the input information of the heating bolt;
A temperature measuring step of measuring a temperature for each section set through a temperature sensor disposed along the longitudinal direction in the internal mounting hole of the heating bolt,
Controlling the heating unit through a control unit in response to a temperature change of the heating bolt;
And controlling the heating of the heating bolt. The method of claim 8,
The step of controlling the heating unit includes:
The heating unit may adjust at least one of the time, temperature, current, voltage, and frequency of heating the heating bolt through the control unit based on the data obtained in the temperature measurement step to set the heating temperature of the heating bolt And a temperature control step of controlling the temperature of the heating bolt. The method of claim 9,
The temperature control step may include:
Characterized in that the power output of the heating unit is reduced or the power source is shut off so that at least one of the tensile strength, yield strength and elongation of the heating bolt can be prevented from exceeding the set range by overheating, Control method of induction heating system. The method of claim 10,
The step of controlling the heating unit includes:
And an alarm step of informing the operator of the fact that the power of the heating part is cut off when the power of the heating part is cut off. The method of claim 6,
Wherein,
If the set value of at least one of time, temperature, current, voltage, frequency, active power, reactive power, tensile strength, yield strength and elongation is inputted in the condition of heating the heating part, data set so that the set values of remaining elements are automatically set And a data base for storing the heating bolt.
KR1020160005912A 2016-01-18 2016-01-18 Induction Heating system for Heating-bolt and Control Method Thereof KR101607465B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101688072B1 (en) * 2016-08-12 2016-12-20 디아이케이(주) Induction Heating system for Heating-bolt
KR101688073B1 (en) * 2016-08-23 2016-12-20 디에스파워 주식회사 Induction Heating system for Heating-bolt
KR101961402B1 (en) * 2018-12-17 2019-03-22 디아이케이(주) Induction Heating Device for Heating-bolt and Control Method Thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003300121A (en) 2002-04-02 2003-10-21 Mitsubishi Heavy Ind Ltd Bolt heater
KR101460208B1 (en) 2013-07-15 2014-11-10 한전케이피에스 주식회사 Induction heating type heater

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003300121A (en) 2002-04-02 2003-10-21 Mitsubishi Heavy Ind Ltd Bolt heater
KR101460208B1 (en) 2013-07-15 2014-11-10 한전케이피에스 주식회사 Induction heating type heater

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101688072B1 (en) * 2016-08-12 2016-12-20 디아이케이(주) Induction Heating system for Heating-bolt
KR101688073B1 (en) * 2016-08-23 2016-12-20 디에스파워 주식회사 Induction Heating system for Heating-bolt
KR101961402B1 (en) * 2018-12-17 2019-03-22 디아이케이(주) Induction Heating Device for Heating-bolt and Control Method Thereof

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