JP3029920B2 - Extubation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tube removing device suitable for replacing a boiler tube such as a steam drum and a water drum of a steam boiler.

[0002]

2. Description of the Related Art Conventionally, when replacing a boiler tube which is fixedly joined to a steam drum, a water drum, or the like of a steam boiler by expanding the tube, the expanded portion of the inner surface of the tube is heated by combustible gas and then rapidly cooled by air or water. The tube is extruded by contraction and relaxation of the tube , and no other heat source is applied for heating except for heating with a combustible gas such as propane or acetylene.

[0003] As described above, conventionally , the expansion of the expanded portion is performed only by heating with a combustible gas.
Effectively and uniformly heat only expanded portion from inside a relatively small diameter tubes, for example, inner diameter 20mm, such as boiler tubes
It can not, also not temperature control is accurately performed in the combustible gas, heated to an unnecessary portion such as a drum shell plate, there are problems such as the material deterioration of the drum shell plate is raw Ji Ruosore, further combustible in a gas locally it takes a long heating time since not concentrate heat, not only leads to man-hour increase, rapid heating the tube, there is a problem of poor efficiency for targeting the contraction and relaxation by quenching.

[0004]

[SUMMARY OF THE INVENTION The present invention has been proposed in view of such circumstances, it is possible to locally efficiently and uniformly heat the inner surface, it can be reduced heating steps And meets the specified heating conditions
As a result, it is possible to prevent the quality deterioration without unnecessary heating of the surrounding members, and to reduce the number of tube removal steps by performing only the heating step or the heating and cooling steps according to the sequence. It is an object of the present invention to provide an extubation device capable of performing the above-mentioned operations.

[0005]

For this purpose, the extubation of the present invention is provided.
The device is supported with the pipe end penetrating the pipe support wall.
Withdraw the tube supported by the wall from the tube support wall
This is a tube removal device for use when connecting to a high-frequency power supply.
Power cable and cooling water inlet / outlet support
Protruding from the tip of the body
From the high frequency power supply via the power cable
Receiving the high frequency current of
High frequency is inserted into the hollow part and
A high-frequency induction heating coil for induction heating,
The tube of the high-frequency induction heating coil protruding from the tip
When the end of the body tube is inserted into the hollow part, the tip is
The tube of the high-frequency induction heating coil in contact with the wall of the body
Set the insertion depth of the body tube end into the hollow part to the set depth.
Coil positioning rod to be restricted and high frequency induction heating coil
After heating the inner circumference of the tube end of the above
The high frequency induction heating coil through the cooling water port
Cooling water introduction device for introducing cooling water into the hollow portion of
ing. Further, in the extubation device of the present invention,
But surround the high-frequency induction heating coil
The above-mentioned high-frequency induction
Heating coil with respect to the inner periphery of the tube end of the tube body
After heating, a large number of air outlets are inserted into the pipe at the end of the pipe.
It has a cooling nozzle that blows out cooling air toward the periphery.
You.

[0006]

[Action] In extubation apparatus of the present invention, high-frequency induction heating coil is inserted in the extraction tube locally efficiently and uniformly heat the inner surface by high-frequency induction heating. That
At this time, the tip of the coil positioning rod is
Point contact with the high frequency induction heating coil of the tube
Set the insertion depth of the body tube end into the hollow part to the set depth.
It is not necessary to heat the wall surface of the tube supporting wall, which is a peripheral member, unnecessarily . High frequency induction heating coil localizes the inner surface of the tube
After rapid heating , if the material cannot be rapidly cooled, the fixed joint of the pipe is contracted and relaxed by natural heat radiation.If the material can be rapidly cooled, cooling air or water is immediately blown out from the cooling nozzle to the inner surface of the pipe. Rapidly shrinks and relaxes the bonded joints.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the tube removing apparatus of the present invention will be described with reference to the drawings. FIG. 1 is a front view of the tube removing apparatus, FIG. 1 (I) shows a case where only a high-frequency induction heating coil is used, and FIG. FIG. 2 is a diagram illustrating an operation sequence of a heating process of the main tube removing device, and FIG. 3 is a diagram illustrating an operation sequence of a heating and cooling process of the main tube removing device.

First, in FIG. 1 (I), a plurality of small diameter boiler tubes 2 are implanted in a drum body plate 1 of a steam drum or a water drum and fixed by expanding. The boiler tube according to the present boiler tube for heating, cooling and baffling the boiler tube 2 has a matching transformer (not shown) housed inside a prismatic body 3 and a boiler which is removed at the center of the tip of the body 3. A high-frequency induction heating coil 4 that can be inserted into the tube 2 protrudes, and a base is connected to the matching transformer. The heating coil 4 is Ru solenoid type or hairpin small diameter is used for insertion into the small diameter of the boiler tube 2. Heating coil 4 shown is a solenoid type, the heating coil 4 or kites are composed of water cooled copper tube, the base of the body 3 is provided with a cooling water inlet and outlet 5. Further, a power cable 6 for connecting a matching transformer to a high-frequency power supply (not shown) is connected to the center of the base of the body 3, and the frequency of the high-frequency power supply is relatively high, because of the coil shape and the miniaturization of the matching transformer.
About 100 kHz is desirable. A plurality of coil positioning rods 7 projecting from the outer periphery of the tip of the body 3 toward the surface of the drum body plate 1 project from the tip, and appropriately define the insertion depth of the high-frequency induction heating coil 4 in the tube. In order to do so, the protrusion length can be adjusted.

Next, in FIG. 1 (II), a cooling nozzle 8 for air cooling is coaxially fitted or detached or fixed coaxially with the outer periphery of the high-frequency induction heating coil 4 at the center of the tip of the body 3.
The cooling nozzle 8 has a plurality of air outlets 9 formed in a tip region thereof, and a cooling air supply port 10 provided at a base thereof. In the case where the inner diameter of the boiler tube 2 is extremely small, it is appropriate that the cooling nozzle 8 is not fixedly mounted on the outer periphery of the heating coil 4 and the outer periphery of the cooling nozzle 8 is cooled immediately after heating to cool the nozzle. The example shows such a case. Further, the cooling nozzle 8 may be for water cooling.

In such an apparatus, an operation sequence in which the expanded portion of the boiler tube 2 is heated by the high-frequency induction heating coil 4 and then naturally radiated will be described with reference to FIG. First, a thermocouple is attached to the boiler tube 2 in advance, and the length of the coil positioning rod 7 is adjusted to adjust the insertion depth of the heating coil, and the high-frequency output is adjusted to adjust the heating coil at a predetermined heating temperature, for example, about 10 seconds. 4
Make sure that it can be heated to 00-450 ° C. Next, the boiler tube 2 from which the high-frequency induction heating coil 4 is removed
And press the power start button. As a result, the boiler tube 2 is rapidly heated, and when the specified heating time is reached, the power is turned off. Then, the boiler tube 2
Preparation work for extubation ends. Next, after the expanded portion of the boiler tube 2 is heated by the high-frequency induction heating coil 4,
An operation sequence for cooling by the cooling nozzle 8 will be described with reference to FIG. Also in this case, the boiler tube 2 is rapidly heated by the same heating process as described above, and when the specified heating time is reached, the power is turned off. Then, air is blown out from the air outlet 9 of the cooling nozzle 8 to cool the boiler tube 2. After a certain period of time, the supply of air is stopped, and the operation for preparing the boiler tube 2 to be removed ends. Next, a heating coil is inserted into the boiler tube 2 to be heated, and the above series of steps is sequentially repeated.

Thus, according to such an apparatus, since the induction heating is performed by the high-frequency induction heating coil 4, the inner surface of the boiler tube 2 can be locally and efficiently heated uniformly, thereby reducing the number of man-hours. At the same time, a skilled operator of the gas heating operation becomes unnecessary, and the gas heating operation in the narrow boiler drum is eliminated, so that the working environment is improved. Further, if set to temperature was measured conditions specified of the heating unit can be accurately controlled to the provision of heating conditions, the drum shell plate 1 can be prevented that quality deterioration without unnecessarily pressurized heat.
Further, since the insertion depth of the high-frequency induction heating coil 4 and the cooling nozzle 8 can be adjusted to effectively heat and cool the expanded portion, the boiler tube 2 can be easily contracted and relaxed, and the high-frequency induction heating coil 4 and the cooling nozzle 8 can be inserted. By performing a series of steps of heating, cooling according to the sequence,
Continuous extubation processing becomes possible.

[0012]

According to the tube removing device of the present invention, the following effects can be obtained. (1) With the pipe end penetrating the pipe support wall, the pipe support wall
When extracting the supported tube by the body from the tube support wall
Tube removal device for use with high frequency power supply
Power cable and body supporting the cooling water inlet / outlet
And formed at the tip of the body by a hollow tube
From the high frequency power supply via the power cable
By receiving a high-frequency current, the inside of the pipe end
Inserted into the empty space, high-frequency induction
A high-frequency induction heating coil for conducting heat,
The tube body of the high-frequency induction heating coil protruding from the end
When the tube end is inserted into the hollow part, the tip is
Tube of the high-frequency induction heating coil in contact with the wall of
The insertion depth of the tube end into the hollow part is controlled to the set depth.
Coil positioning rod to limit and high frequency induction heating coil
After heating the inner end of the tube at the end of the tube
The above high-frequency induction heating coil through the cooling water port
A cooling water introduction device for introducing cooling water into the hollow portion
This makes it possible to locally and efficiently heat the inner surface of the pipe , reduce the number of heating steps , and perform accurate control to meet the specified heating conditions .
Rukoto can, the tip of the coil positioning rod, tube support wall
Of the tube support wall which is the peripheral member
The wall can <br/> be prevented that quality deterioration without heating unnecessarily, further only the heating step, or heating, a cooling step performed in accordance with the sequence can be reduced extubation steps, industrially extremely useful It is possible to provide a simple extubation device. (2) The extubation device uses the high-frequency induction heating coil.
Removably protrudes from the end of the body so as to surround it
The end of the tube by the high frequency induction heating coil
After heating the inner peripheral part of the pipe,
Cooling that blows cooling air toward the inner circumference of the pipe at the end of the pipe
The cooling nozzle is equipped with a cooling nozzle,
Can be freely attached to and detached from the tip of
That it can be heated efficiently and uniformly locally
In addition, the number of heating steps can be reduced, and
Coil can be precisely controlled to match
The tip of the positioning rod abuts on the wall of the tube support wall at point contact
Unnecessarily heat the surrounding wall of the tube support wall
Quality can be prevented, and the heating process
Or perform the heating and cooling steps according to the sequence and remove the tube.
An industrially useful extubation device that can reduce man-hours
Can be provided.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment of a tube removing apparatus according to the present invention. FIG.
Indicates a case where the cooling nozzle is fitted.

FIG. 2 is an explanatory diagram of an operation sequence of a heating step of the above device.

FIG. 3 is an explanatory diagram of an operation sequence of a heating and cooling process of the above device.

[Explanation of symbols]

 Reference Signs List 1 drum body plate 2 boiler tube 3 body 4 high-frequency induction heating coil 5 cooling water inlet / outlet 6 power cable 7 coil positioning rod 8 cooling nozzle 9 air jet port 10 cooling air supply port

Continuation of the front page (72) Inventor Tsukasa Maenozono 2-81-3, Tonomachi, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Within the Dai-ichi High Frequency Industry Co., Ltd. (56) References JP-A-4-22094 (JP, A) ( 58) Field surveyed (Int.Cl. ⁷ , DB name) B23P 19/04

Claims (2)

(57) [Claims] (1) A state in which a pipe end penetrates a pipe support wall body.
Pull out the tube supported by the tube support wall from the tube support wall.
An extubation device for use when wiping.
Supports power cable and cooling water inlet / outlet connected to the source
And the tip of the body formed by a hollow tube
Section and project the high-frequency power through the power cable.
Tube by receiving high frequency current from a source
Inserted into the hollow part at the end, and
A high-frequency induction heating coil for high-frequency induction heating;
The high-frequency induction heating coil
When inserting the tube end of the tube into the hollow part, the tip is
The high-frequency induction heating coil contacts the wall of the support wall
The insertion depth of the tube end of the tube into the hollow part was set.
Coil positioning rod to limit the depth
A heat coil is used to add the end of the tube to the inner periphery of the tube.
After heating the high frequency induction heating through the cooling water inlet and outlet
A cooling water introducing device for introducing cooling water into the hollow portion of the coil;
An extubation device comprising: 2. The extubation device according to claim 1, wherein
The extubation device surrounds the high-frequency induction heating coil.
To the tip of the body so that it can be
Inner circumference of the end of the above-mentioned tube by frequency induction heating coil
After heating the pipe end of the above-mentioned pipe from a number of air outlets
Cooling nozzles that blow cooling air toward the inner
An extubation device, comprising: