KR101894051B1 - High frequency thawing device - Google Patents

Abstract

The present invention improves the configuration of a high-frequency thawing machine capable of uniformly continuously discharging a large amount of thawing water in a short time using a high frequency and minimizing a drip loss caused in thawing, thereby increasing the efficiency of defrosting operation, And a plurality of functions are improved such that the negative heat is rapidly discharged.
That is, the present invention provides a high frequency generating device comprising a high frequency generating part 3 and a power supply part 4 provided on the upper part of a base 2, And a lower electrode 8 provided below the thawing portion 7. The thawing portion 7 is provided with a coil 6 and an upper electrode 9, A high frequency concentrating cover 15 which is installed to surround the upper electrode 9 and is opened at the bottom and which is provided with a sliding unit 10 or a conveyor 14 selectively ; A ventilation duct (12) and a ventilation fan (13) for discharging heat generated in the high frequency generator (3); A grounding copper plate 17 provided between the upper electrode 9 mounting frame and the base frame; And a trans-cooling fan (20) for cooling the transformer (19) installed at one side of the high frequency generator (3).

Description

{High frequency thawing device}

The present invention relates to a high-frequency thawing machine, and more particularly, to a high-frequency thawing machine capable of uniformly and continuously discharging a large amount of thawing water in three short time periods using a high frequency wave, The present invention relates to a high-frequency thawing machine in which a plurality of functions are improved, such as an increase in efficiency of operation and a rapid discharge of heat from the high-frequency generating portion and the transformer portion.

Korea consumes about 1.35 million tons of frozen aquatic products per year. In the process of thawing, there are leading deterioration, quality deterioration, secondary pollution and excessive defrosting costs.

Commonly known thawing techniques include natural thawing, high temperature wet thawing, immersion water thawing, and immersion aeration.

In the case of natural thawing, it takes about 12 ~ 24 hours for labor to be consumed due to multi-stage loading of thawing trucks. Therefore, uniform thawing is impossible due to quality degradation and temperature difference between inside and outside. Labor force is consumed due to forced demolition, It is unsanitary and requires a lot of space.

In case of high-temperature wet-type thawing, it takes 8 ~ 12 hours of thawing time and work at high temperature of 20 ℃. , The labor force is consumed due to forced demolition, and drips are generated, which is unsanitary and requires a lot of space.

It is unhygienic and secondary contamination is serious due to the consumption of labor force due to the input and discharge of the thawing tank, pollution of wastewater from the effluent, unhygienic dismantling, consumption of labor force due to decommissioning,

Also, in the case of immersion and aeration, the labor cost, difficulty of dismantling, time consuming for 3 ~ 6 periods, quality deterioration due to drip generation, and secondary pollution became problems.

In other words, the conventional defrosting technology requires a lot of space and time, leading to deterioration of lead, drip generation, wastewater generation, secondary pollution, labor, and cost.

In addition, since the tap water thawing occurs more frequently than the thawing of the refrigerator, and the loss of the nutrient content of the extract is increased, the defrosting technology capable of minimizing the amount of drip after defrosting has been desperately desired.

For reference, shortening the time required for thawing determines the quality of aquatic products, but generally the thawing rate is about two times slower than the freezing rate. The reason for this difference in the time required is that the heat transfer rate is about four times higher than that before freezing if the food is frozen.

When the object freezes, it begins to freeze from the surface, so that heat conduction is improved and cold heat is conducted to the object at a high speed. However, when thawing, the surface melts first and the heat conduction from outside to inside deteriorates.

Since the thermal conductivity of water is about 1/4 of ice and the thermal diffusivity is about 1/10 of ice, the thermal properties of water, which accounts for the majority (60 ~ 80%) of the food ingredients, Is slower than the freezing rate.

On the other hand, there is known a technology capable of defrosting thawing water using microwaves. However, microwaves have a high heat resistance to water, but when used for defrosting food, heat is generated in the course of ice molecules changing into water And there is a problem that uniform thawing is impossible due to overheating and partial hot spots (hot spots).

Since the high-frequency wave penetrates deeply into the thawing water because it has a longer wavelength than the microwave, it is required to develop a more efficient and stable thawing machine by using high frequency wave because uniform thawing is possible.

KR Patent No. 10-0591780 Korean Patent Publication No. 1994-0011762

The present invention is based on the discovery of a new technology for solving all the problems of the prior art as described above. It is possible to perform uniform thawing even in rapid thawing, so that there is no deterioration of the defrosted object, .

In addition, it is possible to rapidly discharge the heat of the high-frequency generating unit and the transformer unit, and to prevent the high frequency generated from the upper electrode to the lower electrode of the thawing unit of the conveyor type high-frequency thruster from affecting the adjacent high- And to provide a high frequency thawing machine capable of doubling the operation reliability of the apparatus and minimizing the performance deterioration and malfunction of the thawing machine due to electromagnetic noise.

In order to accomplish the above object, the present invention provides a high-frequency thawing machine,

A coil and an upper electrode which are installed so as to be able to move up and down to a thawing portion through an electrode interval adjusting device in the high frequency generating portion, a lower electrode provided below the thawing portion, A disposable high-frequency thawing machine, comprising: a sliding unit for inputting and extracting thawing water; and a door unit that can be opened and closed at one side of a thawing unit,

A high frequency concentrated cover installed to surround the upper electrode and opened at a lower portion thereof;

A ventilation duct for venting the heat generated by the high frequency generator and an air blowing fan;

A grounding unit provided between the upper electrode mounting frame and the base frame;

And a trans-cooling fan for cooling the transformer installed at one side of the high-frequency generating unit is provided.

In addition, it is also possible to provide a high frequency generating portion and a power supply portion provided on the upper portion of the substrate, a coil and an upper electrode which are installed in the high frequency generating portion so as to be ascendable and descendable through the electrode spacing adjusting device, A conveyor type high-frequency thawing machine having a conveyor for continuously introducing and extracting thawing water to and from a portion of a conveyor;

A high frequency centralized cover installed to surround the upper electrode so as to be opened;

A ventilation duct for venting the heat generated by the high frequency generator and an air blowing fan;

A side copper plate installed between the upper electrode mounting frame and the base frame, and a side copper plate installed to be able to receive the electromagnetic wave generated from the upper electrode and the lower electrode and to transmit a current to the high frequency generating unit;

And a blocking wire duct for blocking the electromagnetic wave generated from the upper electrode from affecting the surrounding electric wire.

An analog ammeter may be installed in the high frequency generating unit to transmit only the voltage output to the control box of the power supply unit, and a plurality of noise filters may be provided.

The high-frequency wave defroster provided in the present invention is capable of defrosting a large amount of defrosting water in a short time by uniformly heating the defrosting water from inside using high frequency waves,

Particularly, in the present invention, the ventilation duct 12 and the ventilation fan 13 are provided in the high frequency generating section 3, and the trans cooling fan 20 is installed in the transformer section 19, So that reliability of operation of the apparatus can be doubled,

The high frequency centralized cover 15 is provided on the upper electrode 9 so that the high frequency is concentrated on the lower electrode 8 so that shortening of the defrosting time and the occurrence of crossing between high frequencies generated in the neighboring high frequency generating part 3, It can be done.

It is also possible to block the electromagnetic wave generated in the upper electrode 9 from affecting the surrounding electric wire by installing a shielding wire duct in the wire wiring portion and to maintain balance by installing the grounding copper plate 17, So that the current can be circulated to the high frequency generator 3.

In addition, the conveyor type high-frequency wave defroster 1 can be separated and manufactured in three stages, such as a three-stage stage, so that it is possible to provide transportation and installation advantages.

1 is a front view showing an embodiment of a high-frequency thawing machine provided in the present invention.
2 is a plan view showing an embodiment of the high-frequency thawing machine provided by the present invention.
3 is a side view showing an embodiment of the high-frequency thawing machine provided in the present invention
Fig. 4 is a perspective view showing a conveyor type high-
5 is a front view showing the conveyor type high-frequency wave breaking device provided in the present invention.
Fig. 6 is a side view showing the conveyor type high-frequency thawing machine provided in the present invention
7 is a side cross-sectional view showing the conveyor type high-frequency wave breaking device provided in the present invention
Fig. 8 is an electric circuit diagram of the conveyor type high-frequency thawing machine provided in the present invention
Fig. 9 is an electric circuit diagram of the conveyor type high-frequency thawing machine provided in the present invention

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying 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 obscure the subject matter of the present invention.

The high-frequency wave defroster provided in the present invention provides a high-frequency wave defroster capable of uniformly defrosting the defrosted water in a short time by inputting defrosting water and effectively discharging heat from the high-frequency generating unit and the transformer, The disturbance signal is actively suppressed and the operation reliability is greatly enhanced.

That is, the high-frequency wave defroster of the present invention is manufactured as a batch type or a conveyor type, and includes a ventilation duct and an air blowing fan that can rapidly discharge heat generated when the high frequency generating unit is operated, A high frequency centralized cover provided on the upper electrode for concentrating the high frequency generated from the upper electrode in the lower electrode during operation of the generator and a blocking wire duct for blocking the high frequency from affecting the surrounding wire are provided, Is installed on the side plate to transfer the high frequency generated from the lower electrode to the high frequency generator and it is possible to defrost the specific thawing water automatically by programming the dictionary menu according to the defrosting operation .

Various embodiments of the present invention having the above-described features will be described in detail below with reference to the drawings.

FIG. 1 is a front view showing a preferred embodiment of the high-frequency wave defroster provided in the present invention, FIG. 2 is a plan view, and FIG. 3 is a side view.

This is a batch type high frequency wave defrosting machine 1 in which a high frequency generating portion 3 and a power supply portion 4 are provided on an upper portion of a base body 2 and an electrode gap adjusting device 5 And a thawing portion 7 formed at the middle of the base body 2 by providing a coil 6 and an upper electrode 9 formed under the lifting frame 2a, It is possible to perform a quick and uniform defrosting between the lower electrode 8 and the upper electrode 9 by using a high frequency wave.

An output copper plate 16 for transmitting the high frequency generated from the upper high frequency generating portion 3 to the coil 6 and the upper electrode 9 is formed at the central portion of the lifting frame 2a. A grounding copper plate 17 may be further formed between the lifting frame 2a and the frame of the base body 2 below the high frequency generating portion 3 so as to maintain the electrostatic shielding effect.

A sliding unit 10 is installed in the thawing unit 7 so that the thawing water 21 can be inserted and withdrawn from the front surface of the base body 2 in a sliding manner. A door unit 11 capable of slidingly opening and closing is installed.

Referring to the side view of FIG. 3, the sliding unit 10 adjusts the stopping lever 31 up and down so that the sliding unit 10 can control the pulling-in and pulling-in operations.

That is, when the stopping lever 31 is raised, the blocking plate located on the opposite side is angularly downwardly moved about the pivot axis to be separated from the sliding unit 10. When the stopping lever 31 is downward, the blocking plate is moved upward, .

The door unit 11 connects the link 11a with the cylinder 11b having the end fixed in the defrosting unit 7 so that the door unit 11 can be opened and closed stably without any flow during the vertical opening and closing operation.

The electrode gap adjusting device 5 in the batch type high frequency wave defroster 1 is provided with a pinion 5b rotated in normal and reverse directions by a motor 5a and a coil 6 formed below the rack gear 5c which is gear- And the upper electrode 9 is provided below the coil so that the coil 6 and the upper electrode are raised and lowered above the lower electrode 8 fixed to the lower end of the defrosting portion 7 by driving the motor 5a.

The ventilation duct 12 and the ventilation fan 13 are installed on the upper part of the base 2 so as to quickly discharge the heat generated when the high frequency generating part 3 is operated.

The high frequency generator 3 of the high frequency generator of the present invention amplifies a voltage to generate a high voltage and oscillates the high frequency wave through a vacuum tube. This is a technique that has been applied to existing industrial fields. .

The lower portion of the upper electrode 9 is opened in the direction of the outer edge of the upper electrode 9 so that the high frequency generated by the operation of the high frequency generating portion 3 can be concentrated to the thawing portion 7 between the upper electrode 9 and the lower electrode 8 The concentrated high-frequency cover 15 is installed. In the high-frequency thruster, a shield wire made of a metal mesh is used as a wire to block the electromagnetic waves generated in the upper electrode 9 from affecting the wire.

Fig. 4 is a perspective view showing a high-frequency thawing machine provided in the present invention, and Fig. 5 is a front view, Fig. 6 is a side view, and Fig.

The conveyor type is a case in which the high-frequency defrosting device 1 is constituted so that the defrosting water 21 is continuously fed into the conveyor 14 so that the continuous defrosting operation can be performed.

The conveyor type high-frequency wave defroster 1 exemplifies the case where seven high-frequency generating units 3 are continuously provided on the upper side of the base 2. [ Of course, the number of the high-frequency generating units 3 that can be installed in one high-frequency thawing machine 1 can be increased or decreased according to the required capacity of the required area.

If the worker moves the frozen thawed water 21 onto the conveyor 14, the defrosted water is gradually thawed and discharged from the rear end as the conveyor 14 moves backward, so that mass thawing can be continuously performed.

To this end, the conveyor 14 installed in the left and right longitudinal direction within the base can be driven by the conveyor drive motor 14a.

A lower electrode 8 is fixed to the lower portion of the conveyor 14 and a plurality of lifting frames 2a are connected to the lower end of the electrode gap adjusting device 5, A coil 6 is formed on the lower side of the lower electrode 8 and an upper electrode 9 is provided on the lower side of the coil so that the defrosted water 21 charged into the defrosting portion 7 formed in the middle of the base body 2 through the conveyor, And the upper electrode 9 are defrosted.

In the conveyor type high-frequency wave defroster 1, a pinion 5b rotating in normal and reverse directions by a motor 5a as in the arrangement type in which the electrode gap adjusting device 5 is provided, and a rack- Since the upper electrode 9 and the coil are simultaneously raised and lowered by providing the upper electrode 6 and the upper electrode 9 and seven high frequency generating portions 3 are provided, The drive shaft 5d to which the pinion 5b is fixed is coupled with the coupling 5e so as to simultaneously perform the lifting and lowering operation.

On the other hand, a ventilation fan 13 is installed on one side of the upper part of the thawing machine so that heat generated in the electronic devices can be rapidly discharged when the high frequency generating part 3 installed on the upper part of the base 2 is operated, And the ventilation duct 12 is disposed on the upper part of the base so that the outside air introduced by the ventilation duct 12 can be discharged to the outside through the high frequency generating unit 3. [

A trans-cooling fan 20 for cooling is also installed in the transformer unit 19 provided on one side of the high-frequency generating unit 3. [

The lower portion of the upper electrode 9 is opened in the direction of the outer edge of the upper electrode 9 so that the high frequency generated by the operation of the high frequency generating portion 3 can be concentrated to the thawing portion 7 between the upper electrode 9 and the lower electrode 8 The concentrated high-frequency cover 15 is installed. This is because the high-frequency generating unit 3 and the upper electrode 9 are provided adjacent to each other in a mutually continuous manner to shield the high-frequency generating unit 3, which is adjacent to the high-frequency generating unit 3, from generating cross- Role.

Further, the electric wires use a shield wire made of a metal net with a sheath as an electric wire, and further, a shielding wire duct is provided at a portion where the electric wire is wired to prevent the electromagnetic wave generated in the upper electrode 9 from affecting the surrounding wire .

The grounding copper plate (the grounding copper plate) is provided between the elevation frame 2a provided with the coil 6 and the upper electrode 9 and raised and lowered by the electrode gap adjusting device 5 and the frame 2 below the high- 17) is installed to maintain the operation stability at the time of generating high frequency and to achieve the electrostatic shielding effect.

An output copper plate 16 having a multi-stepped shape is provided at the central portion of the lifting frame 2a so as to transmit the high frequency generated from the vacuum tube of the high frequency generating portion 3 located at the upper portion to the coil 6 and the upper electrode 9 .

A side copper plate 18 for connecting the lower electrode 8 and the high frequency generating portion 3 is provided on the side surface of the base body so that the electromagnetic wave transmitted from the upper electrode 9 is received by the lower electrode 8, A side copper plate 18 is installed so that electromagnetic waves can be transmitted to the side copper plate 18 again. The outer side of the side copper plate 18 is covered with synthetic resin to shield electromagnetic waves.

The conveyor-type high-frequency wave defroster 1 is configured such that a large amount of thawing water 21 is loaded on the conveyor 14 and is thawed while being continuously transported, so that a large amount of thawing water 21 can be simultaneously thawed, And it is possible to automate all the operations by a subsequent process such as cleaning, inspection, and processing of the thawing water 21 after being discharged to the next process.

In addition, the height of the upper electrode 9 is automatically adjusted according to the height of the defrosting water 21, and the output amount and time of the high-frequency power are controlled according to the size and height of the defrosting water 21. At this time, the weight detecting unit of the thawing water 21 controls the high frequency output amount by the unit weight of the defrosting water 21, and the condition changing unit controls the high frequency output amount according to the kind of the defrosting water 21.

The operation of the high-frequency wave defroster 1 of the present invention, which is constituted by a batch type or a conveyor type, is performed in a manner that the defrosting water 21 is supplied from the control panel unit 22, which is configured to allow a worker to operate with a touchpad type, , The user touches the memorized button in the dictionary menu or the like to proceed with the operation.

The menus memorized in the control panel unit 22 can be classified into kinds of the defrosting water 21, that is, fish, meat, vegetables, etc., and the detailed menus of each menu are also memorized.

For example, in the case of fish, the menu can be subdivided into mackerel, dynamic, squid, etc., and the weight, box size, electrode height, defrosting time and the like of the defrosting water 21 can be adjusted and stored in accordance with the defrosting water 21 .

The number of high-frequency output stages can be set in multiple stages, and the defrosting time and the lowering width of the upper electrode 9 can be set in accordance with the height of the box in which the defrosting water 21 is stored.

When the defrosting operation of the defrosting water 21 introduced into the defrosting unit 7 is started by setting the working conditions in the control panel unit 22, (9) is lowered so that the gap between the lower electrode (8) and the defrosting water (21) is adjusted appropriately and the high frequency wave corresponding to the defrosting water (21) (1) is performed automatically.

8 and 9 are electric circuit diagrams of the high-frequency wave defroster 1 of the present invention.

9, a first noise filter 24 is installed at a 3-phase 380V power input terminal to block main noise, an analog ammeter 23 is installed outside the high frequency generator 3, and a converter is configured on the circuit So that only the voltage output value is converted into the communication data via the converter and transmitted to the control panel unit 22, thereby reducing the heat generation problem and the possibility of noise.

10, the three-phase power source operates the motor 5a and the conveyor drive motor 14a of each of the seven high frequency generators 3, the electrode spacing devices, And a second noise filter 25 is provided for blocking the noise immediately after the conversion.

In addition, a third noise filter 26 is further provided on the line connected to the control panel unit 22 for blocking PLC power noise.

The high-frequency wave defrosters of the present invention, which are configured in such a manner as to be arranged or conveyed, can be constructed so that the defrosted water 21 can be thrown and defrosted inside the base body 2, So that the defrosting water 21 can be smoothly introduced into the defrosting water 21 by lowering the upper electrode 9 through the defrosting water source 5 and adjusting the amount and time of the high- ), It is possible to perform uniform thawing in a short time, and the occurrence of drip loss can be minimized.

Particularly, in the present invention, the ventilation duct 12 and the ventilation fan 13 are provided in the high frequency generating section 3, and the trans cooling fan 20 is installed in the transformer section 19, The high frequency centralized cover 15 is provided on the upper electrode 9 so that the high frequency is concentrated on the lower electrode 8 so that the defrosting time is shortened and the adjacent high frequency generating part It is possible to shield the generation of crosstalk between the high frequency waves generated in the antenna 3.

In the case of a conveyor type defrosting machine, a shielding wire duct may be provided at the wire wiring portion so as to prevent electromagnetic waves generated from the upper electrode 9 from affecting the surrounding wires. The grounding copper plate 17 and the side copper plate 18, So that the current reaching the lower electrode 8 can be circulated to the upper high-frequency generating unit 3 again while maintaining a stable balance.

Further, as described above, a converter is provided in each high-frequency generating unit, and a plurality of noise filters are provided on the circuit line, thereby positively suppressing the noise disturbance signal, thereby greatly increasing the operational reliability.

While the present invention has been described in connection with what is presently considered to be the most practical embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Therefore, the scope of protection of the present invention is not limited to the above-described embodiments, but the scope of the claims of the following claims and the scope of protection from these techniques to equivalent technical means should be acknowledged.

1: high frequency thawing machine 2: airframe 2a: lift frame
3: high-frequency generating part 4: power supply part 5: electrode interval adjusting device
5a: motor 5b: pinion 5c: rack gear 5d: drive shaft 5e: coupling
6: coil 7: defrosting part 8: lower electrode 9: upper electrode
10: Sliding unit 11: Door unit 11a: Link 11b: Cylinder
12: Ventilation duct 13: Ventilation fan
14: Conveyor 14a: Conveyor drive motor 15: High frequency concentrated cover
16: output copper plate 17: grounding copper plate 18: side copper plate 19:
20: Fan for cooling the transformer part 21: Thawing water 22: Control panel part
23: Analog ammeter 24,25,26: Noise filter 27: Isolation transformer
31: stopping lever 32: blocking plate 33:

Claims (6)

A power supply section 4 provided on the base 2 and a high frequency generating section 3 for generating a high frequency and a lifting frame 2a connected to the lower end of the electrode gap adjusting device 5 formed on the inner upper side of the base A coil 6 and an upper electrode 9 formed under the lifting frame 2a and a thawing portion 7 formed between the base 2 and the thawing portion to defrost thawing, A sliding unit 10 for loading and unloading the defrosting water 21 to the defrosting unit 7 and a door unit 11 for opening and closing to one side of the defrosting unit 7, A high-frequency thawing machine;
A high frequency concentrated cover 15 installed to surround the upper electrode 9 and opened at a lower portion thereof;
A ventilation duct (12) and an air blowing fan (13) installed on the upper part of the gas for discharging heat generated from the high frequency generating part (3);
An output copper plate 16 for transmitting the high frequency generated in the upper high frequency generating portion 3 to the coil 6 and the upper electrode 9 at the central portion of the lifting frame 2a;
And a grounding copper plate (17) provided between the lifting frame (2a) and the frame (2) of the lower side of the high frequency generating part (3) so as to maintain the operation stability and generate an electrostatic shielding effect when high frequency is generated,
A blocking plate 32 located on the opposite side is angularly moved downward about the pivot shaft 33 to be slid toward the sliding unit 10 when the stopping lever 31 protruded outward is raised up to one side of the lower side of the sliding unit 10. [ And when the stopping lever (31) is downward, the blocking plate (32) is moved upward to brak down the sliding unit.
A plurality of high frequency generating units 3 connected in series in the upper part of the base 2 to generate high frequency waves and a plurality of elevating and lowering electrodes connected to the lower ends of a plurality of electrode gap adjusting units 5 formed on the inner upper side of the base 2, A plurality of coils 6 and an upper electrode 9 formed under the lifting frame 2a and a thawing portion 7 formed at the middle of the base 2 and for defrosting thawing water , A conveyor (14) for continuously introducing and extracting thawing water (21) to the thawing part (7), and a lower electrode (8) fixedly installed right under the conveyor (14) In the group (1);
A high frequency concentrated cover 15 installed to surround each of the upper electrodes 9 and opened at a lower portion thereof;
A ventilation duct (12) and an air blowing fan (13) for discharging heat generated in each of the high frequency generating units (3);
A grounding copper plate (17) installed between the lifting frame (2a) and the frame (2) of the lower side of the high frequency generator (3) so as to maintain the operational stability and generate an electrostatic shielding effect when high frequency is generated;
And an output copper plate 16 for transmitting the high frequency generated in the upper high frequency generating portion 3 to the coil 6 and the upper electrode 9 is provided at the central portion of the lifting frame 2a,
The side copper plate 18 is further provided between the lower electrode 8 and the high frequency generating portion 3 on the side surface of the base so that the electromagnetic wave of the lower electrode 8 can be transmitted to the high frequency generating portion 3 again,
A second noise filter 25 for blocking the noise of a power source transformed by the isolation transformer 27, and a second noise filter 25 for blocking PLC mains noise, Characterized in that the third noise filter (26) provided on the line connected to the control panel part (22) is further provided on the electric circuit of the high frequency wave defroster (1).
delete 3. The method of claim 2,
A trans-cooling fan 20 for cooling the transformer 19 installed at one side of the high frequency generator 3;
And a shielding wire duct for shielding electromagnetic waves generated from the upper electrode (9) from affecting the surrounding electric wires, wherein the electric wires are shielded wires made of metal mesh.
delete 3. The method of claim 2,
An analog ammeter 23 is provided outside the high frequency generator 3 and a converter is formed on the circuit so that only the voltage output value is converted into communication data via the converter and transmitted to the control panel unit 22. [ group.

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