JPH08215950A - Pipe pull-out device - Google Patents

Abstract

PURPOSE: To perform a pulling work by a pipe pull-out device efficiently irrespective of the presence or absence of adhered foreign matter on a pipe to be extracted by providing a foreign matter removal mechanism which removes adhered foreign matter on the surface of the pipe to be extracted on the inlet side of a chuck of the pipe pull-out mechanism. CONSTITUTION: A pressing part 12 is provided on a collar 11 screwed fixedly to the top of a pipe pull-out device 1 on a side brought in contact with a structure 5, and also a through hole 13 through which a core shaft 3 or a pipe 4 is passed is provided. Inside the collar 11, a brush 14 and a scraper 15 are arranged in tandem near an inlet and apart from the inlet, respectively so that they are brought in contact with the outer surface of the core shaft or pipe 4 passed through the through hole 13. When the core shaft 3 or pipe 4 is moved in axial direction by a pulling force from a drive device, as it moves, first the brush 14 rubs the outer surface of the pipe 4 so as to peel off some degree of adhered foreign matter and also the scraper 15 scrapes off foreign matter from the outer surface.

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 for drawing a tubular member such as a metal tube disposed inside a structure such as a heat exchanger or a condenser by a mechanical force such as hydraulic pressure. It is about.

[0002]

2. Description of the Related Art A large number of pipes through which a fluid flows are installed in equipment such as heat exchangers, condensers and boilers installed in thermal power plants, nuclear power plants and various chemical plants. These tubes usually consist of metal tubes, such as STB material, which cause scale adhesion, corrosion or damage during long term use. Therefore, it is necessary to regularly inspect and replace these devices, and in such maintenance work, in order to perform the drawing work efficiently, the pipe to be replaced is drawn by mechanical force such as hydraulic pressure. Use the device.

As an extubation device, for example, Japanese Patent Publication No. 56-4
There is a long member automatic drawing machine described in Japanese Patent No. 0275. This is a jaw (like a collet chuck) that fits or captures a threaded mandrel that is screwed into the inner surface of a fixed tube, a jaw actuating means that opens and closes the jaw, and a jaw that moves axially. The driving means for moving and the reaction member that comes into contact with the surface of the fixed portion and generates a reaction due to the movement of the jaw are the basic constituent elements. After the jaw is fitted and captured by the jaw by means of the jaw actuating means and the reaction member is brought into contact with the surface of the fixed portion, the driving means is actuated. The driving force of the driving means is transmitted to the tube fixed through the jaw and the threaded mandrel, overcoming the action with the reaction member, the tube is forced to move in the axial direction, and from the heat exchanger, etc. Be pulled out.

In addition, although the invention has not been published at the time of filing of the present application, Japanese Patent Application No. 6-
There is an extubation device of 115839. This is a device for pulling a tube from a structure against the pulling reaction force acting between the tube and the structure by moving the tube fixed to the structure in the axial direction. The constituent elements are first and second reciprocating devices arranged in tandem in the axial direction, and unidirectional first and second reciprocating devices for transmitting the pulling force by the respective movable parts of the reciprocating devices to the pipe. There are a force transmission mechanism and a drive device that drives each reciprocating device so that each movable part of each reciprocating device repeatedly reciprocates in synchronization with each other.

Each force transmission mechanism clamps the pipe to be extubated or the core shaft connected to the end of the pipe when the movable part moves in the drawing direction, and clamps when the movable part moves in the opposite direction. To release. For example, an externally operated chuck device that is opened and closed by a clamp piston that operates with fluid pressure, or a self-actuated chuck device that uses a one-way ratchet mechanism that is biased by spring force, or a collet chuck-type hydraulic clamp device is used. Etc. can be used.

In any case, the shape of the clamp engaging surface of the force transmitting mechanism is generally such that the outer surfaces of the core shaft, which is the object to be clamped, and the pipe to be extubated are smooth surfaces. It is necessary to generate strong engagement with respect to the object to be clamped in the pulling-out direction, and for example, a claw-shaped rack tooth shape is provided.

The position of the movable portion of the first and second reciprocating devices may be detected by a position detector and used for reversing the reciprocating motion of the driving device. As the position detector, for example, a limit switch, a differential transformer, a proximity switch, a photo sensor or the like is used.

Further, when the pipe is completely withdrawn from the structure, it is necessary to stop the operation of the reciprocating device in order to prevent accidents due to so-called idling operation after complete withdrawal. As a method therefor, in addition to an electrical manual method by operating a stop switch based on visual confirmation by an operator, an automatic method for automatically detecting a pulled-out state of a pipe may be adopted. As the detection means in the case of the automatic method, for example, a sensor for detecting the presence or absence of the pipe in the extubation device by contact or non-contact, or a force transmission mechanism arranged at a position closest to the structure side depending on the absence of the pipe. For example, a sensor that detects a state where it cannot be clamped, or a sensor that detects a sudden decrease in load torque or a rapid increase in moving speed when the movable part moves in the pulling direction is used.

[0009]

As described above, when a tube such as a heat exchanger is replaced, scale adhesion or corrosion may occur on the tube. Specifically, the outer surface of the pipe is covered with rust or the like, and the inner surface of the pipe is covered with scale or scale. In addition, while pulling out such a pipe, foreign matter such as rust, scale, scale, etc. peels off and accumulates in the extubation device. Further, when the pipe is pulled out from the structure, metal powder is generated on the outer surface of the pipe due to friction between the structure and the pipe.

When the pipe to be pulled out is longer than one stroke of the pipe pulling device, it is necessary to clamp the core shaft or the pipe itself several times to pull out one pipe. Therefore, as described above, if foreign matter such as rust, scale, scale, etc. adheres to the pipe, the foreign substance will enter the pipe extracting device, and these foreign substances will fill the valley portion of the blade of the collet chuck. It may happen. In such a case, the collet chuck is not sufficiently engaged with the pipe, so even if the drive device is operated, the pipe is not pulled out from the structure, and the collet chuck slides in the pipe axial direction and damages the pipe surface. Become.

By cleaning the valley portion of the blade of the collet chuck, the collet chuck and the pipe can be sufficiently engaged with each other, and the cleaning of the blade is not necessary unless foreign matter such as rust adheres to the pipe. However, since the fluid is flowing in the tubes, foreign matter is attached to many of the tubes.

It is necessary to clean the collet chuck every time the valley portion of the blade is filled up. In the situation where a large number of pipes need to be replaced in a short time, the cleaning is difficult, and the operator is required to do so. The load on the machine becomes too large, and the efficiency of the drawing work is significantly reduced.

On the other hand, if rust, hot water, scales, metal powder, dust or the like adheres to or mixes with electronic components such as the various sensors in the above-mentioned extubation device, it may cause malfunction or device failure. The efficiency of is decreased, which is not preferable.

The present invention has been made in view of the above problems, and it is an object of the present invention to efficiently perform a drawing operation by a tube extracting device regardless of the presence of foreign matter on the tube to be drawn.

[0015]

According to the first aspect of the invention, the pulling reaction force acting between the pipe fixed to the structure and the structure is moved in the axial direction through the chuck. In the pipe removing device for pulling out the pipe from the structure against the above, a foreign substance removing mechanism for removing foreign substances adhering to the surface of the target pipe on the inlet side of the chuck of the pipe removing mechanism is provided.

In the invention described in claim 2, claim 1
In the extubation device according to the item 1, the foreign matter removing mechanism includes a peeling mechanism that peels the foreign matter from the surface of the tube, and a discharging mechanism that discharges the peeled foreign matter to the outside.

In the invention described in claim 3, claim 2
In the extubation device according to the item 1, the peeling mechanism includes a brush that scrapes the surface of the tube as the tube passes.

In the invention described in claim 4, claim 2
In the extubation device according to the item 1, the peeling mechanism includes a scraper that scrapes foreign matter from the surface of the pipe as the pipe passes.

According to the invention described in claim 5, claim 2
In the extubation device according to the item (1), the peeling mechanism includes a brush that scrapes the surface of the tube as the tube passes, and a scraper that scrapes foreign matter from the surface of the tube as the tube passes in a tandem arrangement.

In the invention described in claim 6, claim 2
In the extubation device according to the item (1), the discharging mechanism includes a collar housing with an opening that discharges the foreign matter peeled by the peeling mechanism from a predetermined position to the outside.

In the invention described in claim 7, claim 2
In the extubation device according to the item (1), the discharge mechanism includes a pressurized gas injection mechanism that discharges the foreign matter separated by the separation mechanism to the outside by the pressurized carrier gas.

In the invention described in claim 8, claim 2
In the extubation device according to the item (1), the discharge mechanism includes a suction mechanism that discharges the foreign matter separated by the separation mechanism to the outside by suction.

[0023]

According to the first aspect of the present invention, if foreign matter adheres to the surface of the target tube, the foreign matter removing mechanism removes the foreign matter on the inlet side of the chuck, so that the foreign matter does not enter the extubation device. , The valley portion of the blade of the collet chuck is not filled with foreign matter. Therefore, even if foreign matter adheres to the pipe, the collet chuck and the pipe are not insufficiently engaged with each other, and the pulling force is completely transmitted to the pipe.

In addition, even if foreign matter adheres to the surface of the target pipe,
Since various electronic components such as a sensor mounted in the extubation device do not adhere or mix with rust, scale, scale, etc., it does not cause malfunction or device failure.

In the invention described in claim 2, since the peeling mechanism peels the foreign matter from the tube surface and the discharging mechanism discharges the peeled foreign matter to the outside, the foreign matter is not accumulated in the extubation device. Therefore, it is not necessary to remove the foreign matter from the extubation device, and the transmission of the pulling force to the pipe is completely performed without being influenced by the amount of the adhering foreign matter.

In the invention described in claim 3, since the brush included in the peeling mechanism rubs the tube surface as the tube passes, the brush and the tube relatively move, and the tube surface adheres. Foreign substances are separated by a brush at the same time when the pipe is pulled out. Therefore, a mechanism for moving the peeling mechanism becomes unnecessary, and the mechanism of the apparatus is simplified.

In the invention described in claim 4, since the scraper included in the peeling mechanism scrapes off the foreign matter from the tube surface, even if the foreign matter which cannot be easily peeled off by the brush adheres to the tube surface, Forcibly peel off.

Further, as the foreign matter is scraped off from the surface of the pipe as the pipe passes, the scraper and the pipe move relative to each other, and the foreign matter adhering to the surface of the pipe is separated by the scraper at the same time when the pipe is pulled out. Therefore, a mechanism for moving the peeling mechanism becomes unnecessary, and the mechanism of the apparatus is simplified.

In the invention described in claim 5, since the brushes and the scrapers are arranged in tandem, foreign matter adhering to the surface of the pipe is first peeled off with a brush, and then foreign matter which could not be peeled off with the brush, Further, it is forcibly peeled off by a scraper. Therefore, the types of adhered foreign substances that can be peeled off are large, and a wide range of measures can be taken.

Further, as the brush passes along the pipe surface, the brush scrapes the pipe surface, and the scraper scrapes off the foreign matter from the pipe surface. Therefore, the brush and the scraper move relative to the pipe, and the foreign matter adhering to the pipe surface. Is withdrawn by the brush and scraper as soon as the tube is pulled out. Therefore, a mechanism for moving the peeling mechanism becomes unnecessary, and the mechanism of the apparatus is simplified.

In the invention described in claim 6, the opening-equipped color housing included in the discharging mechanism discharges the foreign matter separated by the separating mechanism from a predetermined position to the outside. Therefore, for example, if the opening of the color housing is provided at the position where the foreign matter peeled off by the peeling mechanism naturally falls, the foreign matter will be exposed to the outside by the action of gravity without using another member as the discharging mechanism. Since it is discharged, the structure of the discharging mechanism is simplified.

Further, when the pressurized carrier gas is jetted onto the foreign matter and the foreign matter is discharged, an opening is provided on an extension line of the jetting direction.

In the invention described in claim 7, since the pressurized gas injection mechanism included in the discharge mechanism directly injects the pressurized carrier gas to the foreign matter separated by the separation mechanism, the foreign matter is forcibly forced to the outside. Discharge.

In the invention described in claim 8, since the suction mechanism included in the discharge mechanism forcibly discharges the foreign matter separated by the peeling mechanism to the outside by suction, particularly in the vicinity of the pulling operation, Does not stain the floor.

Further, even when the separated foreign matter is a powdery substance such as rust, since the suction method is adopted, the foreign matter is not suspended in the surrounding air during the drawing operation and the air is not polluted.

[0036]

1 is a partial sectional view of an extubation device according to an embodiment of the present invention. The tube extracting device 1 is the same as the conventional one, and the tube 4 is opened and closed by the collet chuck 2.
The core shaft 3 or the pipe 4 itself connected to is clamped or opened.

The collar 11 fixed to the tip of the extubation device 1 is provided with a pressure contact portion 12 on the side in contact with the structure 5, and a through hole 13 through which the core shaft 3 or the pipe 4 passes.
Is provided. The tip of the core shaft 3 is provided with a screw groove 3a having teeth that are shaped to bite into the inner surface of the pipe in the drawing direction, and when the end of the pipe 4 to be extracted cannot be directly clamped, the core shaft 3 3 is screwed onto the end of the tube 4.

Inside the collar 11, a brush 14 is located closer to the inlet and a scraper 15 is located farther from the inlet so as to come into contact with the outer surface of the core shaft 3 or tube 4 passed through the through hole 13. Arranged in tandem. The brush 14 and the scraper 15 are arranged in the collar 11 so as to be continuous in the circumferential direction so as to come into contact with the entire circumference of the pipe 4.

The brush 14 may be made of a commonly used material, for example, a steel wire brush, a nylon brush, a palm (a palm fiber or a scrubber fiber) brush, and a brass. Select from among brushes, stainless steel brushes, and other animal (pork hair, horse hair, white wool, etc.) hair brushes, depending on the usage conditions.

The scraper 15 may be made of a commonly used material, for example, nitrile rubber, polyurethane rubber, etc., as well as natural rubber, fluororubber, resin (Bakelite, nylon, sponge, etc.), metal ( Steel, copper, aluminum, etc.), wood, other cloth, etc.
Use properly according to the usage situation.

Since the core shaft 3 and the pipe 4 are moved in the axial direction by the pulling force from the driving device (not shown), the brush 14 is first moved along with the movement. The outer surface of the tube 4 is rubbed to remove some adhered foreign matter, and then the scraper 15 scrapes the foreign matter from the outer surface of the tube 4.

In this embodiment, the color 11 and the brush 14 are used.
Although both the scraper 15 and the scraper 15 are arranged, depending on the condition of the foreign substances adhering to the pipe 4, the type and amount thereof, and the number of pipes to be pulled out, even if only one of them is arranged, the object of the present invention can be sufficiently achieved You can

Since the foreign substances adhering to the outer surface of the pipe 4 to be extracted can be completely removed by the brush 14 and the scraper 15, the foreign substances do not enter the pipe extracting device and the valley of the blade of the collet chuck 2 is removed. The part is not filled with foreign matter.

In this embodiment, since the core shaft 3 is screwed into the pipe 4 in advance, the end of the pipe 4 is blocked by the core shaft 3. Therefore, even if foreign matter such as scale or scale adheres to the inner surface of the pipe, it does not enter the extubation device and it is not necessary to remove this foreign matter.

The collar 11 is provided with a notch 16 for discharging foreign matter between the brush 14 and the scraper 15. The position of the notch 16 is a position where the foreign matter separated from the surface of the tube 4 naturally falls, and the foreign matter is discharged from the notch 16 to the outside of the collar. The natural drop method may not discharge smoothly, but has an advantage that the configuration of the device can be simplified.

Since the positional relationship between the extubation device 1 and the structure 5 is constant regardless of the place where the pipes are clamped if the pipes are the same, a foreign matter collection container, such as a bucket, is placed below the notch 16 for extraction. If the work is performed, it is possible to save the labor of cleaning after the work is completed. The size of the notch 16 can be freely determined in consideration of the strength of the collar 11 according to the type of foreign matter, its amount, size, and the like.

Next, another embodiment for discharging foreign matter from the collar will be described with reference to FIGS. In FIG. 2, the foreign matter is forcibly discharged to the outside by the pressurized gas conveyed from the outside by the tube 23. The injection unit 22 is provided at a predetermined position so as to inject the pressurized gas toward a place where the separated foreign matter is most concentrated. A cutout 24 through which foreign matter is discharged is provided on the extension line of the injection. The notch 24 is not limited to one place, and if a plurality of notches 24 are provided, foreign matter can be efficiently discharged. The injection method may pollute the work environment, and especially when the foreign matter is a powder, it may scatter the foreign matter and pollute the surrounding air. Is excellent in that it does not matter much.

It should be noted that it is preferable to provide the jetting portion 22 in the upper portion and the notch 24 in the lower portion because the foreign matter can be rationally discharged by utilizing the gravity even though it is forcedly discharged. It is also preferable to provide a plurality of injection units 22 in order to cope with the situation where the foreign matter is not discharged smoothly.

An external view and a sectional view of the collar 21 in FIG. 2 are shown in FIG. FIG. 3A is a view of the collar 21 seen from the same direction as FIG. 2, and the lower half shows an external view and the upper half shows a sectional view. FIG. 3B is a sectional view taken along the line AA.
Since the collar 21 has two jetting portions 22 and each has a notch 23 on the opposite side of the jetting portion 22, the pressurized gas can be jetted from two places. The injection part 22 is provided with a screw part corresponding to the tube end part in order to facilitate the clamping of the tube 23.

In FIG. 4, foreign matter is forcibly discharged to the outside by an industrial vacuum cleaner 42 provided outside. The collar 41 in this case is different from the collar 21 in the case of the injection method in that only the suction portion 43 is provided and no cutout is provided, but other than that, it is the same. Further, if the suction portion 43 is arranged below the collar 41, the foreign matter can be rationally discharged by utilizing gravity. In the case of the suction method, it is difficult to efficiently discharge foreign matter when it is viscous, but when it is powdery material, it is not necessary for the worker to prepare for dust prevention. It is a more effective discharging means than the injection method in that it does not get dirty.

2 and 4, both the brush and the scraper are arranged in tandem in the same manner as the collar in FIG. 1, but the state of foreign matter adhesion on the pipe and its type
It is possible to simplify the structure of the collar by disposing only one of the two in consideration of the amount and the number of pipes to be extracted.

As means for discharging foreign matter to the outside of the collar,
Although three examples of the free fall method, the injection method, and the suction method have been described, which one is to be used depends on the type and amount of foreign matter, other working environment, etc., while taking into consideration the advantages and disadvantages of each of the above. Need to decide.

[0053]

According to the invention described in claim 1, even if there is a foreign matter adhered to the surface of the target pipe, the pulling work can be performed with the same contents without affecting the pulling work by the pipe pulling device. . Therefore, the pulling operation can be continuously performed without checking the presence or absence of foreign matter in the target pipe.

According to the second aspect of the present invention, it is not necessary to interrupt the removal operation of the separated foreign matter and discharge it to the outside. Even if the amount of the foreign matter is large, the extraction operation is continuously performed. be able to.

According to the invention described in claim 3, the structure of the peeling mechanism can be simplified.

According to the invention described in claim 4, even foreign matter which cannot be easily peeled off can be forcibly peeled off and the structure of the peeling mechanism can be simplified.

According to the fifth aspect of the present invention, the number of kinds of adhered foreign matter that can be peeled off is large, and it is possible to deal with a wide range of types, and the structure of the peeling mechanism can be simplified.

According to the invention described in claim 6, the structure of the discharging mechanism can be simplified.

According to the invention described in claim 7, foreign matter can be efficiently discharged to the outside.

According to the invention described in claim 8, it is possible to prevent the work environment from being deteriorated due to the drawing work, and to reduce the post-cleaning work after the work is completed.

[Brief description of drawings]

FIG. 1 is a partial sectional view of an extubation device according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of the extubation device according to the second embodiment of the present invention.

FIG. 3 is an external view and a sectional view of a collar used in a second embodiment.

FIG. 4 is a partial cross-sectional view of the extubation device according to the third embodiment of the present invention.

FIG. 5 is an external view of the extubation device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe removing device 2 Collet chuck 3 Core shaft 4 Pipe to be extracted 5 Structure 11 Color 12 Pressure contact portion 13 Through hole 14 Brush 15 Scraper 16 Notch

Claims (8)

[Claims] 1. A pipe extracting device for extracting a pipe fixed to a structure from the structure against an extraction reaction force acting between the structure and the structure by moving the pipe in the axial direction through a chuck. In the tube removing device, a foreign matter removing mechanism for removing foreign matter adhering to the surface of the target tube on the inlet side of the chuck of the tube removing mechanism. 2. The extubation device according to claim 1, wherein the foreign matter removing mechanism includes a peeling mechanism for peeling the foreign matter from the tube surface and a discharging mechanism for discharging the peeled foreign matter to the outside. 3. The extubation device according to claim 2, wherein the peeling mechanism includes a brush that scrapes the surface of the tube as the tube passes. 4. The extubation device according to claim 2, wherein the peeling mechanism includes a scraper that scrapes foreign matter from the surface of the pipe as the pipe passes. 5. The peeling mechanism includes a brush that scrapes the pipe surface as the pipe passes and a scraper that scrapes foreign matter from the pipe surface as the pipe passes in a tandem arrangement. The extubation device according to claim 2. 6. The extubation device according to claim 2, wherein the discharging mechanism includes a collar housing with an opening that discharges the foreign matter separated by the separating mechanism from a predetermined position to the outside. 7. The extubation device according to claim 2, wherein the discharge mechanism includes a pressurized gas injection mechanism that discharges the foreign matter separated by the separation mechanism to the outside by a pressurized carrier gas. 8. The extubation device according to claim 2, wherein the discharge mechanism includes a suction mechanism that discharges the foreign matter separated by the separation mechanism to the outside by suction.