JPH02261584A - Device for cleaning outer surface of pipe - Google Patents

Abstract

PURPOSE:To automatically clean a pipe by providing a cleaning cloth delivery device for winding the cleaning cloth and a roll moving mechanism. CONSTITUTION:The pipe 1 is set on a receiving base 15 before the cleaning cloth is wound, a cleaning liq. such as acetone is discharged and supplied by a supply mechanism C, and the cylinders 9 and 10 of movable rolls 5 and 6 are actuated to extend the rod 11 of the upper cylinder 9. The rod 12 of the cylinder 10 is retreated and moved, and the cleaning cloth 2 is wound on the left half of the pipe 1. The adjacent cleaning head on the opposite side is similarly operated, and the cleaning head is wound on the other half of the pipe. The two cleaning heads are loaded on one rack, the rack is moved in the axial direction of the pipe, and cleaning is performed. By this method, the pipe is efficiently wiped.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention mainly relates to an apparatus for cleaning the outer surface of a tube or rod (hereinafter simply referred to as a tube) having a predetermined length, such as a cladding tube of a nuclear reactor fuel rod. It is.

(Prior art) In nuclear fuel rods, Zircaloy cladding tubes that cover uranium dioxide pellets are exposed to oil and other harmful substances adhering to the outer and inner surfaces, as well as to the outer peripheral surface during the polishing process in the Zircaloy cladding manufacturing process. Adhering Zircaloy powder adheres to equipment and tools during handling up to the final process of fuel rod manufacturing.
There is a problem of damage to the cladding tube, and sufficient cleaning is usually performed to remove these oils, harmful substances, and Zircaloy alloy powder.

In general, the cladding tube is a vibrator with a total length of about 4 m and an outer diameter of about 10 mmφ. In the conventional external cleaning method, as shown in Figures 4 and 5, a person (P, ) supports the vicinity of both ends of the cladding tube (1). ,1
This is done by a person (Pg) wrapping the cladding tube (1) with a cleaning cloth (21') made of gauze impregnated with acetone, holding the cladding tube firmly in his hands, and wiping by moving axially along the entire length of the tube body. ing.

(Problem to be Solved by the Invention) However, the above conventional method is a manual process, and requires three workers for each cladding tube, which is a heavy labor and inefficient process. Along with securing sex, it has been strongly sought after.

In response to this trend, the present invention aims to promote automation of similar external surface cleaning of pipe bodies based on the above-mentioned external surface cleaning of cladding pipes. In addition to simply wiping it off, it also requires wrapping it in a cloth soaked in acetone and replacing it at a certain frequency; The purpose of this project is to discover the configuration of an automatic cleaning device by focusing on improving the cleaning effect equivalent to that of the wiping method, solve the above problems, and achieve effective automatic cleaning of pipe bodies. .

(Means for Solving the Problems) The configuration of the device of the present invention that satisfies the above objectives includes, first, a holding device that holds both ends of a tubular body of a predetermined length; and, in the axial direction of the tubular body held by the holding device, Based on at least two cleaning heads arranged at a predetermined interval and capable of reciprocating in the axial direction of the tube, the two or more cleaning heads are arranged at a predetermined interval in the axial direction of the tube between adjacent ones. The cleaning cloths are arranged on opposite sides of the tube body, and the cleaning cloths are pulled out from the respective supply rolls in a direction perpendicular to the axis direction of the tube body, and then wound up through a first guide roll, an intermediate movable front and rear roll, and a second guide roll. The structure includes a cleaning cloth feeding device for winding the cleaning cloth on a side roll, and the movable rolls before and after the cloth speeding device are positioned front and back in the cleaning cloth feeding direction with the pipe body in the middle, and there is a structure between the two rolls. A roll moving mechanism that cooperates with each other is provided to wrap the cleaning cloth around the tubular body so as to hug it approximately half a circumference. The combination of the various components includes the addition of a cleaning liquid applying mechanism for applying a cleaning liquid such as acetone to appropriate positions.

Note that it is desirable to maintain a predetermined tension on the cleaning cloth while it is being fed, so a torque motor is used to rotate the supply roll, and a motor with a brake is used to rotate the take-up roll. .

(Function) When cleaning a tubular body using the apparatus of the present invention configured as described above, first, a cleaning cloth is mounted on a feeding device, and the tubular body is held by a holding device.

In this state, after applying the cleaning liquid to the desired position on the cleaning cloth, move the front and rear movable rolls to move the tube body around half of the way with the cleaning cloth between them so that the cleaning liquid part is in contact with the tube body. Wrap around.

This is operated in opposition with at least two adjacent cleaning heads, and after wrapping the entire circumference of the tubular body with these re-cleaning heads, it is moved in the axial direction to perform cleaning.

After doing one-way cleaning in this way, next time use a small amount of cleaning cloth.
For example, the cleaning is performed by repeating the same operation again by rolling one rotation of the winding roll so that a new cleaning cloth comes into contact with the cleaning cloth, and then moving the cleaning head in the opposite direction.

Thus, by reciprocating the cleaning head in the axial direction of the tube body and winding up the winding roll, it is possible to continue cleaning without having to replace the cleaning cloth again and again.

(Example) The present invention will be described in detail below with further reference to the accompanying drawings.

FIG. 1 shows an overview of the device according to the invention, and FIG. 2 shows an overview of the cleaning head. In addition, Fig. 3 shows 1 of the tube body holding device.
Give an example.

In each of these figures, (A) is a pipe body (1) such as a cladding pipe.
(B) is a cleaning head, and as shown in FIG. There are two supply rolls (2) disposed facing each other on both sides, each pulling out and supplying a gauze-like cleaning cloth (2) wound into a roll.
3), and a first guide roll (4) 1 front and rear 2 for guiding the cleaning cloth (2) pulled out from the supply roll (3).
The cleaning cloth includes two movable rolls (5) (6), a second guide roll (7), and a winding side roll (8) for winding up the cleaning cloth (2). The cloth (2) is sequentially supplied and guided by driving a motor (not shown).

These two cleaning heads (B) are usually mounted on a single frame, and are capable of reciprocating movement in the axial direction of the tube body (1), and after one-way cleaning, the winding side roll (8) rotates once, the winding side roll (8) winds up the cleaning cloth (2) a little, and a new cleaning cloth is drawn out.

A torque motor (not shown) is used as the motor (not shown) that rotates the supply roll (3) of the cleaning cloth (2), and the rotational force is constantly maintained in the opposite direction to the winding direction to feed the cleaning cloth (2). By applying tension and using a motor with a brake for the rotating motor of the winding side roll (8), a structure is added that applies a holding force to the tube body while winding is in progress and improves the ability to wipe away dirt, etc. There is.

In the cleaning head (B) having the above configuration, the present invention further includes a cleaning liquid applying mechanism (C) for applying a cleaning liquid such as acetone to the cleaning cloth (2) in the vicinity of the front movable roll (5). and front and rear movable rolls (5)
(6) is equipped with a cylinder (9) 0ω as a movable roll moving mechanism for wrapping the cleaning cloth (2) around the tube (1) so as to wrap it around approximately half the circumference of the tube (1). ing.

The cylinders (9) 00) used for wrapping the cleaning cloth have a front movable roll (5) and a rear movable roll (6) respectively, with the movable roll (5) facing the sliding part 03) at the tip of the rod (I +) surface.
) (6) are attached, and the rods (IDQ21) of the front and rear cylinders (9) O[]) that sandwich the tube body (1) are opposite to each other, and when one side expands,
The other direction is in the direction of shortening.

In addition, FIG. 3 is an example of a device for holding the tube body in the above-mentioned cleaning, and shows a tube positioning and fixing device. Both end surfaces are fixed and held by a fixing device 0ω.

(Thus, to wrap the cleaning cloth as shown by the solid line position of the movable roll in Fig. 2, set the tube body (1) on the pedestal 05 in the previous state, and apply cleaning liquid such as acetone by discharging it by the application mechanism (C). After that, each movable roll (5) (6) cylinder (
9) Activate 0ω and press the rod (
10, the rod 021 of the lower cylinder 0ω is shortened and moved to the position indicated by the chain line in FIG. 2, and the cleaning cloth (2) is wrapped around the left side of the tube body (1) approximately half a circumference. In the same manner, the adjacent cleaning head on the opposite side in FIG. 1 is operated to wrap the cleaning head approximately halfway around the opposite side of the tubular body.

With the cleaning heads wrapped around the entire circumference of the tube body (1) in this way, the two cleaning heads are mounted on one pedestal, and the pedestal moves in the axial direction of the tube body to perform cleaning. . After one-way cleaning, the cleaning cloth (2) is rolled up a little so that the new part is in contact with the cleaning cloth (2), and cleaning is performed one after another.

The positional relationship has been designed in advance so that when the two cylinders (9) θω are moved to wrap the cleaning cloth around the tube, the part that dispenses the cleaning liquid such as acetone will be exactly in the position where it hits the tube. .

Furthermore, the cleaning head (B) wraps the cleaning cloth around the end face holding pipe of the tube body positioning and fixing device, and by moving the cleaning head in the axial direction, the unwashed portion near the end face portion is eliminated.

Furthermore, since the cleaning head (B) moves through the center of the apparatus body, the tube holder is constructed so that it escapes by a cylinder mechanism when the cleaning head passes.

The scope of use of the cleaning device according to the present invention described above is wide, and it is suitable for cleaning the outer surface of cladding tubes used in all types of nuclear reactors such as PWR, BWR, and FWR, as well as general use vibrators and round rods. It can also be applied to cleaning materials, etc.

Further, the device of the present invention can be attached with the sheathing tube positioning and fixing device, the tube handling device, and the tube cradle to easily improve its practicality as an automated device.

(Effects of the Invention) As described above, the apparatus of the present invention cleans the tube body using a cleaning head including a mechanism for wrapping a cleaning cloth around the outer circumference of the tube body and a mechanism for feeding the cleaning cloth, For items such as cladding pipes (conventionally, it was difficult to automate cleaning and required three workers to clean the external surface), by using the device of the present invention, it can be cleaned as an automatic cleaning device with almost no manual labor required. It has a remarkable effect of promoting the rationalization of cleaning work.

In addition, when looking at cladding cleaning and including the fuel rod manufacturing process, conventionally the fuel rod manufacturing process and the cleaning process were considered to be separate, but by making automatic cleaning possible, it is possible to washing can be included in the process, providing the advantage of a fully automatic process sequence.

In addition, by providing the configurations described in claims 2 and 3, the pressing of the cleaning cloth against the pipe and the wrapping of the cleaning cloth on the pipe body improves the holding force of the part, and the tension is applied to the cleaning cloth. The wiping performance of the tube body can be improved.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an overview of the cleaning device according to the present invention, FIG. 2 is a schematic explanatory diagram of a cleaning head that forms the main part of the device, and FIG. 3 is a part showing an example of a tube holding device. Abbreviated schematic diagram, No. 4
1 and 5 are explanatory diagrams showing aspects of conventional cladding tube cleaning. (8)...tube holding device, (B)...cleaning head. (C)...Cleaning liquid application mechanism, (1)...Pipe body. (2)...Washing cloth, (3)...Supply side roll. (4)...First guide roll. (5) (6)...Movable roll. (7)...Second guide roll. (8)... Winding side roll. (9) (10) ...Cylinder. Figure 4 Figure 5

Claims (1)

[Claims] 1. A holding device that holds both ends of a tubular body of a predetermined length, and a holding device that holds both ends of a tubular body of a predetermined length; Consisting of at least two cleaning heads that can reciprocate in the axial direction of the arranged tube,
Each cleaning head pulls out the cleaning cloth from the supply side roll in a direction perpendicular to the tube axis direction, passes through the first guide roll, two middle movable rolls before and after, and the second guide roll, and transfers the cleaning cloth to the take-up side roll. The front and rear movable rolls of the cleaning cloth feeding device are located on both sides with a tubular body in the middle in the cleaning cloth feeding direction, and the cleaning cloth between the two rolls is wound around the tubular body approximately half a circumference. Cleaning of the outer surface of a pipe body, characterized in that the cleaning cloth has a moving mechanism that can be attached to the cleaning cloth, and a cleaning liquid application mechanism that applies a cleaning liquid such as acetone to the cleaning cloth is attached at an appropriate position at least before the front movable roll. Device. 2. An apparatus for cleaning the outer surface of a tubular body according to claim 1, wherein a torque motor is used to rotate the supply roll of the cleaning cloth feeding device, and a motor with a brake is used to rotate the take-up roll. . 3. A device for cleaning the outer surface of a tubular body, characterized in that the movable roll moving mechanism is a cylinder mechanism that is provided on each movable roll and arranged to face each other, and reverses the expansion and contraction action of the rod.