JPH07227762A - Method and device for grinding, polishing and cleaning inner surface of pipe - Google Patents

Abstract

PURPOSE:To enable a scale on the inner surface of a pipe to be removed evenly along the longitudinal direction of the pipe in a short time. CONSTITUTION:In a method for grinding, polishing and cleaning the inner surface of a pipe using grinding/polishing/cleaning machines 15, 16 each having a suction head 21 through which an abrasive flows out and a reservoir tank 22 for retaining the abrasive, a compressed air nozzle 24 through which a whirl of compressed air is blown from the suction head 21 into the pipe 13 to be treated is provided in the suction head 21. The pipe 13 to be treated is connected to the suction head 21 at one end 13A and to the reservoir tank 22 at the other so as to grind, polish and clean the inner surface of the pipe 13 to be treated, and then the pipe 13 to be treated is connected to the suction head 21 at one end 13B and to the reservoir tank 22 at the other end 13A so as to grind, polish and clean the inner surface of the pipe 13 to be treated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for polishing and cleaning a pipe inner surface.

[0002]

2. Description of the Related Art A high pressure blowing method or a negative pressure suction method is generally used as a method for cleaning the inner surface of a steel pipe or the like. Recently, the latter method has become popular because of its advantages such as ease of handling, maintainability, and cost.

As shown in FIG. 4, this negative pressure suction system is equipped with a suction head 2 for flowing out the polishing / cleaning material supplied from the polishing / cleaning material hopper 1, and a receiver tank 3 for receiving the polishing / cleaning material. Use a machine. Then, the pipe to be processed 4 is sandwiched between the suction head 2 and the receiver tank 3, and the blower 5
A negative pressure suction force is applied from the receiver tank 3 side to the suction head 2 side by the negative pressure suction force, and the inner surface of the non-treatment pipe 4 is polished and cleaned by the polishing and cleaning material flowing from the suction head 2 toward the receiver tank 3. To do.

Here, the cleaning material flowing from the suction head 2 toward the receiver tank 3 is the suction head 2
A swirl flow forming structure provided inside the chamber makes the swirl flow to flow in the non-treatment pipe 4.

[0005]

However, the prior art has the following problems. The swirl flow of the abrasive cleaning material flowing in the pipe 4 to be treated is strong on the suction head 2 side but weak on the receiver tank 3 side. Therefore, the polishing effect at the end of the treated tube 4 on the receiver tank 3 side is reduced.

If the scale of the pipe 4 to be processed is thick at the pipe end, the scale at the pipe center can be removed in a relatively short time, but the pipe end, especially the receiver tank 3 side having a low polishing effect as described above, Requires a long removal time at the edges.

The above is particularly remarkable in alloy steel pipes such as 13Cr steel pipe. That is, alloy steel pipe is SG
Compared with a plain steel pipe such as P, the scale is dense and heat-treated, so that the thickness of the scale is not uniform in the longitudinal direction of the pipe and is thick at both pipe ends. Therefore, in the conventional tube inner surface cleaning method by the negative pressure suction method, even if the ordinary steel steel tube such as SGP can be processed in a relatively short time,
An alloy steel pipe such as a Cr steel pipe requires a very long blasting treatment time, resulting in a marked decrease in production capacity.

An object of the present invention is to make it possible to remove the scale on the inner surface of the pipe uniformly along the longitudinal direction of the pipe in a short time.

[0009]

The present invention as set forth in claim 1 uses a polishing head equipped with a suction head for discharging the polishing and cleaning material and a receiver tank for receiving the polishing and cleaning material. Insert the pipe to be processed between the tank and
A negative pressure suction force is applied from the receiver tank side to the suction head side, and this negative pressure suction force makes it possible to sharpen and clean the inner surface of the pipe to be treated with a polishing and cleaning material flowing from the suction head toward the receiver tank. At
The suction head is equipped with a pressure nozzle that blows swirling compressed air from the suction head side to the pipe to be treated.One end of the pipe to be treated is connected to the suction head side and the other end is connected to the receiver tank side to clean the inner surface of the pipe to be treated. After that, the other end of the pipe to be treated is connected to the suction head side and one end is connected to the receiver tank side so that the inner surface of the pipe to be treated is scoured.

According to a second aspect of the present invention, a polishing and sweeping machine equipped with a suction head for flowing out the polishing and cleaning material and a receiver tank for receiving the polishing and cleaning material is used. Negative pressure suction force is applied from the receiver tank side to the suction head side across the treatment tube, and this negative pressure suction force enables the inner surface of the pipe to be treated to be sharpened and cleaned by the polishing material flowing from the suction head to the receiver tank. In the pipe inner surface cleaning and cleaning device, the inlet side cleaning and cleaning machine is installed on the inlet side and the outlet side cleaning and cleaning machine is installed on the outlet side along the transfer line of the tube to be processed. Side, the other end is connected to the receiver tank side so that the inner surface of the pipe to be treated can be ground and cleaned, and in the output side cleaner, the other end of the pipe to be processed is connected to the suction head side and one end is connected to the receiver tank side. The inner surface of the processing tube is ground Becomes as possible, suction head KakuKen 掃機 is obtained by the so provided with a compressed air nozzle for blowing compressed air in the swirling flow from the suction head side to be treated tube.

According to a third aspect of the present invention, in the tube inner surface polishing and cleaning apparatus according to the second aspect, the suction head of each polishing and cleaning machine further comprises a polishing and cleaning material charging area for charging from the polishing and cleaning material hopper. The compressed air nozzles are arranged in a region on the side opposite to the abrasive cleaning material inflow direction with respect to the abrasive cleaning material input area.

[0012]

According to the results of the research conducted by the present inventor, the following findings (a) and (b) were obtained regarding the polishing action of the inner surface of the pipe.

(A) The polishing effect is higher as the swirling angle of the swirling flow of air generated in the pipe is larger when sucked by a blower of the same power.

(B) The swirling flow of the above (a) becomes smaller in swirling angle as it goes from the suction head side to the receiver tank side.

The present invention has been made on the basis of the above findings, and has the following actions. Since the compressed air nozzle that blows the compressed air of the swirling flow from the suction head side is provided to the pipe to be processed, the swirling angle of the swirling flow in the pipe can be increased.

Also in the above, since the swirling angle of the swirling flow becomes small on the receiver tank side, in order to avoid the reduction of the polishing effect on the receiver tank side due to this, in order to avoid the reduction of the polishing effect on the receiver tank side, each of the suction head and the receiver tank is The position of the tube to be treated was reversed. As a result, each of the both ends of the pipe to be processed is always provided with an opportunity to be positioned on the suction head side, and is swept and swept under a swirling flow having a large swirling angle.

Due to the above, not only in the ordinary steel steel pipe such as SGP but also in the heat-treated alloy steel steel pipe such as 13Cr steel pipe, the scale on the inner surface of the pipe can be uniformly removed along the longitudinal direction of the pipe in a short time. be able to.

Since the compressed air nozzle is arranged in a region on the side opposite to the abrasive cleaning material inflow direction in the suction head, the abrasive cleaning material flowing in the suction head collides with the compressed air nozzle. Can be eliminated, the life of the compressed air nozzle can be extended, and the maintainability of the polishing and cleaning machine can be improved.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic view showing a pipe inner surface cleaning / cleaning device according to an embodiment of the present invention, and FIG. 2 is a schematic view showing a suction head.
FIG. 3 is a schematic diagram showing a modification of the suction head, and FIG. 4 is a schematic diagram showing a conventional device.

As shown in FIG. 1, the pipe inner surface cleaning and cleaning device 10 is
Installed between the inlet-side equipment 11 and the outlet-side equipment 12, the inlet-side blast cleaner on the inlet side along the transfer conveyor 14 (transfer line) of the pipe 13 to be processed between the inlet-side equipment 11 and the outlet-side equipment 12. 15, an outlet-side cleaner 16 is installed on the outlet side.

Each of the inlet-side polishing machine 15 and the outlet-side cleaning machine 16 is capable of performing polishing processing on two pipes 13 to be processed simultaneously in parallel. Each of the polishing machines 15 and 16 includes a suction head 21 that flows out the polishing material supplied from the polishing material hopper (see FIG. 4) and a receiver tank 2 that receives the polishing material.
2 and. Each of the polishing machines 15 and 16 sandwiches the pipe 13 to be treated between the suction head 21 and the receiver tank 22, and uses the blower 23 to receive the receiver tank 22.
A negative pressure suction force from the side of the suction head 21 to the side of the suction head 21, and this negative pressure suction force makes it possible to polish and clean the scale on the inner surface of the pipe 13 to be treated by the polishing and cleaning material flowing from the suction head 21 toward the receiver tank 22. To do. In addition, in this embodiment, the blower 23 is shared by both the polishing and cleaning machines 15 and 16. 23A is an exhaust port of the blower 23.

At this time, in the inlet side cleaning / cleaning machine 15, one end 13A of the pipe 13 to be treated is directed toward the suction head 21 and the other end 1
3B is connected to the receiver tank 22 side to clean the inner surface of the pipe 13 to be processed. Then, in the outlet side sweeper 16, the other end 13B of the pipe 13 to be treated that has been cleaned up by the inlet side sweeper 15 is connected to the suction head 21 side, and the one end 13A is connected to the receiver tank 22 side to be processed. The inner surface of the tube 13 is cleaned.

As shown in FIG. 2, the suction head 21 of each of the cleaning and cleaning machines 15 and 16 is provided with a compressed air nozzle 24 for blowing a compressed air of a swirl flow from the suction head 21 side to the pipe 13 to be treated. There is. In the compressed air nozzle 24, for example, each of all three nozzle openings 24A is twisted around the tube axis by a certain angle, and the compressed air blown out from each nozzle opening 24A is swirled in the pipe 13 to be treated.

Further, in each of the polishing / cleaning machines 15 and 16, as shown in FIG. 3, the suction head 21 is provided with a polishing / cleaning material charging area 25 which is charged from the polishing / cleaning material hopper. The compressed air nozzle 24 may be arranged in the area 26 on the anti-polishing material outflow direction side with respect to 25.

The suction heads 21 of the polishing machines 15 and 16 are moved forward and backward by the head moving cylinder 27, and the pipe 13 to be processed is sandwiched between the receiver tank 22 and the pipe 13 to be processed at the forward position. Each can be connected to each of the suction head 21 side and the receiver tank 22 side.

Therefore, in the pipe inner surface cleaning / cleaning device 10,
Perform the cleaning work as described in (1) and (2) below.

(1) The pipe 13 to be processed carried out from the entrance facility 11 is introduced into the entrance cleaning device 15 by the transfer conveyor 14 and stopped. Suction head 2 of entrance side cleaner 15
No. 1 stands by at the retracted position when the pipe 13 to be treated is introduced, and after the pipe 13 to be treated is introduced, it is advanced by the head moving cylinder 27 to sandwich the pipe 13 to be treated with the receiver tank 22. As a result, one end 13A of the pipe 13 to be processed is connected to the suction head 21 side, and the other end 13B is connected to the receiver tank 22 side.

Next, the blower 23 of the inlet side sweeping machine 15 exerts a negative pressure suction force from the receiver tank 22 side to the pipe 13 to be treated, and the compressed air nozzle 24 from the suction head 21 side to the compressed pipe of the swirling flow. Blow into 13. As a result, the swirling flow of the polishing and cleaning material flowing from the one end 13A to the other end 13B of the processed pipe 13 cleans the inner surface of the processed pipe 13.

(2) After the above (1), the pipe 13 to be treated is transferred from the inlet side cleaner 15 to the outlet side cleaner 16 by the transfer conveyor 14.
Be transferred to and stopped. The suction head 21 of the outlet-side cleaning device 16 stands by at the retracted position when the pipe 13 to be treated is introduced, and after the pipe 13 to be treated is introduced, it is moved forward by the head moving cylinder 27 to move the pipe 13 to be treated. It is sandwiched between the receiver tank 22 and the receiver tank 22. As a result, the other end 13B of the tube 13 to be processed is connected to the suction head 21 side, and the one end 13A is connected to the receiver tank 22 side.

Next, the blower 23 of the outlet side cleaner 16 exerts a negative pressure suction force from the receiver tank 22 side to the pipe 13 to be treated, and the compressed air nozzle 24 from the suction head 21 side to the compressed pipe of the swirling flow. Blow into 13. As a result, the swirl flow of the polishing / cleaning material flowing from the other end 13B to the one end 13A of the target tube 13 cleans the inner surface of the target tube 13.

The operation of this embodiment will be described below. Since the compressed air nozzle 24 that blows the compressed air of the swirl flow from the suction head 21 side to the processed pipe 13 is provided, the swirl angle of the swirl flow in the pipe can be increased.

Also in the above, since the swirling angle of the swirling flow is small on the receiver tank 22 side, in order to avoid the reduction of the polishing effect on the receiver tank 22 side due to this,
The positions of the pipes 13 to be treated with respect to the suction head 21 and the receiver tank 22 were reversed during the polishing process. As a result, each of both ends of the pipe 13 to be processed is always given an opportunity to be positioned on the suction head 21 side, and is swept under a swirling flow having a large swirling angle.

Due to the above, not only in the ordinary steel steel pipe such as SGP but also in the heat-treated alloy steel steel pipe such as 13Cr steel pipe, the scale on the inner surface of the pipe can be uniformly removed along the longitudinal direction of the pipe in a short time. be able to.

The compressed air nozzle 24 is the suction head 21.
By being arranged in the anti-polishing material outflow direction side area 26 with respect to the abrasive cleaning material input area 25 in the inside,
The abrasive cleaning material flowing in the suction head 21 is the compressed air nozzle 2.
4, the life of the compressed air nozzle 24 can be extended, and the maintainability of the scavengers 15 and 16 can be improved.

Next, the experimental results of the present invention will be described. In the pipe inner surface cleaning and cleaning apparatus 10 described above, the treated steel pipe: 13Cr steel pipe, outer diameter 114.3 mm x total length 11,000 mm, pipe wind speed: about 120 m / S, compressed air pressure 4 kg / cm ² , compressed air flow rate 4 Nm ³
/ Minutes.

When the steel pipe to be treated is subjected to the blasting treatment with a single blasting machine, the suction head side end portion A (suction), the pipe central portion B (middle), and the receiver tank side end portion C (receiver) are respectively Table 1 shows the required processing time (relative time).

[0037]

[Table 1]

In the conventional method, the suction head side end portion A,
Since the processing time of the receiver tank side end C is long and the final processing time is the processing time required for the receiver tank side end C that is the longest processing time, It becomes a relative time "7" by being regulated.

On the other hand, in the method of the present invention, the processing time at the suction head side end portion A is significantly shortened (relative time "2"), but the position of the steel pipe to be processed is reversed with respect to each of the suction head and the receiver tank. Unless it is done, the final processing time is the longest processing time.
In order to secure the processing time required for the relative time “7”, it is regulated by the processing time of the end portion C on the receiver tank side.
Becomes

Therefore, in the method of the present invention, the steel pipe to be treated was passed through the inlet-side polisher 15 and the outlet-side cleaner 16 and the positions of the treated steel pipe were reversed with respect to the suction head and the receiver tank. Then, as shown in Table 2, the entrance side sweeper 15
The same processing time "2" is given to each of the suction head side end portion A, the pipe center portion B, and the receiver tank side end portion C. Part B, receiver tank side end C
The same processing time “2” was given to each of the above. As a result, the end portions 13A and 13B of the tube 13 to be processed are given a total processing time of "4" by the operations of the inlet-side cleaner 19 and the outlet-side cleaner 16 and the central portion of the tube 13 to be processed also enters. The total processing time “4” is given to both the blast cleaner 15 and the output blast cleaner 16. That is, both ends 13A and 13B of the tube 13 to be processed are given a chance of scouring on the suction head 21 side, and the processing time "2" required on the suction head 21 side.
Is given a sufficient and sufficient processing time of "4"
The required processing time "4" is given to the central portion of the pipe 13 to be processed, and the desired polishing treatment can be performed on the entire pipe 13 to be processed in the total processing time "4".

[0041]

[Table 2]

Therefore, comparing the scouring ability between the method of the present invention and the conventional method, the total processing time of the conventional method is "4", while the total processing time of the conventional method is "4".
Becomes As a result, the capacity improvement rate is [(7/4) × 100 = 175
%] Can be expected.

The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and changes in design within the scope not departing from the gist of the present invention can be made. Even if it exists, it is included in the present invention. For example, the present invention
In the cooling water pipe of radioactive contamination used for nuclear power generation,
It can be widely applied to other uses such as polishing and removing contaminants on the inner surface of the pipe.

[0044]

As described above, according to the present invention, the scale on the inner surface of the pipe can be removed uniformly along the longitudinal direction of the pipe in a short time.

[Brief description of drawings]

FIG. 1 is a schematic view showing a tube inner surface polishing / cleaning apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a suction head.

FIG. 3 is a schematic view showing a modified example of the suction head.

FIG. 4 is a schematic view showing a conventional device.

[Explanation of symbols]

 10 Pipe Inner Surface Polishing / Cleaning Device 13 Treated Pipe 15 Inlet Polishing / Cleaning Machine 16 Outlet Polishing / Cleaning Machine 21 Suction Head 22 Receiver Tank 23 Blower 24 Compressed Air Nozzle 25 Polishing Material Input Area 26 Anti-polishing Material Outflow Side Area

Claims (3)

[Claims] 1. A suction head for flowing out a cleaning material,
Using a blasting machine equipped with a receiver tank that receives the blasting material, sandwich the pipe to be processed between the suction head and the receiver tank, and apply a negative pressure suction force from the receiver tank side to the suction head side. In the tube inner surface cleaning method that allows the inner surface of the pipe to be treated to be cleaned by the polishing material that flows from the suction head to the receiver tank by suction force, a compressed air nozzle that blows swirling compressed air from the suction head side to the pipe to be treated. On the suction head, connect one end of the pipe to be treated to the suction head side and the other end to the receiver tank to clean the inner surface of the pipe to be treated, and then attach the other end of the pipe to be treated to the suction head side. A pipe inner surface cleaning method characterized by connecting to the receiver tank side to clean the inner surface of the pipe to be processed. 2. A suction head for flowing out a polishing agent,
Using a blasting machine equipped with a receiver tank that receives the blasting material, sandwich the pipe to be processed between the suction head and the receiver tank, and apply a negative pressure suction force from the receiver tank side to the suction head side. A pipe inner surface cleaning and cleaning device that enables the inner surface of the pipe to be processed to be cleaned by a polishing and cleaning material that flows from the suction head to the receiver tank due to suction force. On the outlet side, an outlet side sweeper is installed.In the inlet side sweeper, one end of the pipe to be treated is connected to the suction head side and the other end is connected to the receiver tank side so that the inner surface of the pipe to be treated can be polished. In the output side cleaner, the other end of the pipe to be treated is connected to the suction head side and one end is connected to the receiver tank side so that the inner surface of the pipe to be treated can be ground and cleaned. From A pipe inner surface cleaning and sweeping device comprising a compressed air nozzle for blowing a compressed air of a swirl flow into a processing pipe. 3. The pipe inner surface cleaning / cleaning device according to claim 2, wherein the suction head of each polishing / cleaning machine has a polishing / cleaning material charging area to be charged from a polishing / cleaning material hopper, and a reaction against the polishing / cleaning material charging area is provided. A pipe inner surface cleaning device with a compressed air nozzle arranged in the region on the outflow direction of the cleaning material.