JPS6150037B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for cleaning (removing) substances adhered to the inner surface of a tube, and more particularly to an apparatus capable of completely removing substances even if they are firmly attached to the inner surface of the tube.

For example, when cutting a large-diameter pipe installed underwater or in the ground to a predetermined size or painting the inside surface, it is necessary to keep the inside surface of the pipe clean. In particular, as a technique for cutting steel pipes that have recently been laid underwater at predetermined positions, a hollow cutting rod that is rotatably held in the circumferential direction is directed at the inner wall of the pipe, and the tip of the cutting rod and the inner wall of the pipe are connected. Devices have been developed and are being put into practice that cut pipes by creating an arc between the pipes and ejecting oxygen from the cutting rod, resulting in an oxidation reaction. In this case, there is soil at the point where the pipe is planned to be cut.
If sand, rust, seaweed, concrete, mortar, etc. (hereinafter simply referred to as deposits) are adhered to the product, a good arc may not be generated during cutting, which may hinder the cutting operation. It is necessary to completely remove deposits from this area in advance.

Conventionally, there have been cleaning devices that rotate cleaning elements such as wire brushes for the purpose of cleaning the inner surface of pipes, but these devices cannot remove dirt, sand, etc. that are not very firmly attached to the inner surface of the pipe. However, it is impossible to remove firmly adhered materials such as concrete and mortar (hereinafter referred to as hard deposits). Furthermore, conventional cleaning devices cannot cope with changes in pipe diameter, and the cleaning element must be replaced each time with a cleaning element that matches the pipe diameter.

In view of these points, the present invention provides a device for cleaning hard deposits on the inner surface of a pipe, which can reliably remove any deposits and can also follow changes in the pipe diameter without replacing any parts. The purpose is to Another object of the present invention is to provide a pipe inner surface cleaning device that can automatically remove deposits by remote control under any pipe laying conditions, whether underwater or underground.

The details of the present invention will be explained below based on embodiments shown in the drawings. FIG. 1 is an overall view showing an example of the removing device of the present invention and the state in which it is inserted into a pipe, FIG. 2 is a front view showing the main parts of the removing device, and FIG.
The figure is a perspective view showing the main parts of the removal device.
It is a top view taken along the line Y-Y'.

In the figure, 1 is a steel pipe to be cleaned laid in water or soil, for example, as a steel pipe sheet pile or a steel pipe pile, A is a clamping mechanism inserted into the steel pipe 1 and clamped to the pipe wall at an arbitrary position, and B is a steel pipe to be cleaned. The removal device main body is connected in front of the clamp mechanism A and performs the actual deposit removal work, and 2 and 2' are guides for the clamp mechanism A and the removal device main body B, respectively, whose support legs are adjustable in the pipe diameter direction. It is a roller mechanism.

As shown in FIG. 1, the clamp mechanism A is equipped with a plurality of sets of upper and lower clamp heads 3, 3' around the periphery, and the clamp heads 3, 3' are connected to the central part via link arms 4, 4'. The clamp head 3, 3' is connected to the drive shaft of a rotary cylinder 5 installed in the pipe, and the clamp head 3, 3' is movable in the pipe radial direction by the drive of the rotary cylinder 5, and cleans by applying a pressing force to the pipe inner wall. The device body is configured to be clamped in either the tube axis or tube circumferential direction. A suspension holder 11 is provided on the upper part of the clamp mechanism A, and is adapted to be engaged with a hook of a crane or the like and suspended when the clamp mechanism A is inserted into the pipe.

Further, as shown in FIG. 1, the removing device main body B is connected to the front of the clamp mechanism A via an elevating cylinder guide 6 and an elevating cylinder 7 so as to be movable in the tube axis direction. The main body B of the removal device B is roughly divided into a cleaning block 10, a drive mechanism 9 for the cleaning block 10, and a rotating mechanism 8 as a whole including the cleaning block 10.

Details of the removal device main body B are shown in FIGS. 2, 3, and 4. A mounting shaft 12 coaxially extends from the tip of the lifting cylinder 7, and a rotating shaft 3 having a larger diameter and a shorter length is attached to the upper side of the mounting shaft 12.
3 is rotatably fitted, and a worm wheel 16 is fixed to the upper end of the pivot shaft 33. Furthermore, a rotating rotary cylinder 1 is attached to one side of the tip of the lifting cylinder 7 via a mounting arm 14.
3 is fixed, and a worm 15 that meshes with the worm wheel 16 is attached to the drive shaft of the cylinder 13.
is attached, and when the rotary cylinder 13 is driven, the pivot shaft 33 is rotated around the shaft by the action of the worm 15 and the worm wheel 16. The configuration of the turning mechanism 8 is as described above.

On the other hand, three slide arms 20 extending horizontally are attached around the lower end of the pivot shaft 33 at equal intervals, that is, shifted by 120 degrees when viewed from above (FIG. 4).
A rotating rotary cylinder 17 serving as a drive mechanism for a cleaning block, which will be described later, is installed at 0, and a holding table 18 is installed at the bottom of the rotary cylinder 17. Rotary cylinder 1
The rotating shaft 23 of No. 7 is connected to a swinging arm 21 within the holding table 18, and a cleaning block 10 is attached to the side surface of the tip of the swinging arm 21. Therefore,
The swinging fulcrum of the swinging arm 21 is this rotating shaft 23, which is located away from the center of the tube.

The cleaning block 10 includes a mounting bracket 22 directly fixed to a swing arm 21, and a floating head 24 mounted to the mounting bracket 22 via a spring 25 so as to be able to press against the pipe wall.
, another bracket 22' connected to the mounting bracket 22, and a mounting rod 2 connected to the bracket 22'.
A pair of wire brushes 2 provided above and below via 7
9 and a jet chisel 30 provided between the wire brushes 29. wire brush 2
The mounting rod 27 of 9 can be pressed against the pipe wall by a spring 26, and a stopper 28 is attached to the rear end of the mounting rod 27 to regulate the protruding length of the mounting rod 27. . In addition, 19 is a stopper for determining the swinging limit position of the swinging arm 21, and 32 is a bracket 3 at the lower end of the mounting shaft 12.
1 is a guide roller attached via 1. Further, the jet chisel 30 is connected with a drive mechanism for reciprocating and striking the jet chisel 30 against the inner wall of the pipe.

The floating head 24 is the swing arm 2
1, the swing arm 21 first comes into contact with the pipe wall, and this contact stops the movement of the swing arm 21, and the detection mechanism rotates the swing arm 21 so that the movement of the swing arm 21 is stopped and the attached object is removed. It may also be linked to the drive mechanism of the rotary cylinder 17 and the jet chisel 30.

In the illustrated example, three cleaning blocks 10 are arranged at equal intervals, but in the present invention, any number of cleaning blocks 10 may be installed as long as it is one or more. Further, the clamp mechanism A and various drive mechanisms are not limited to the systems shown in the drawings, and it goes without saying that other known systems may be used as long as they function similarly.

Next, the operation of the present invention will be explained by taking as an example a case in which the deposit removing device having the structure shown in the drawings is applied to cleaning a cut portion of a steel pipe erected in water.

First, the clamp mechanism A and the removing device main body B are suspended from the upper end of the pipe 1 by a crane at the position of the hanging holder 11 and then inserted into the pipe. In this case, only the guide rollers 2, 2' are in contact with the inner wall surface of the pipe, the clamp heads 3, 3' are retracted, and the cleaning block 10 is folded toward the center of the pipe as shown in the upper right corner of FIG. This facilitates passage into the pipe. When the removal device main body B reaches a predetermined position in the pipe, the suspension movement is stopped and the rotary cylinder 5 is driven to extend the clamp heads 3, 3' in the pipe radial direction to firmly clamp and fix the position ( Figure 1).

Once the positions have been determined, each of the three cleaning blocks is driven by the rotating rotary cylinder 17 to swing the swinging arm 21 in the horizontal direction about the rotating shaft 23 and press it against the pipe wall. Swing arm 21
The rotation of the floating head 2 of the cleaning block
The brush 29 stops when it comes into contact with the pipe wall, and at this position the brush 29 is also pressed against the pipe wall by the spring 26. Assuming that the cleaning work is started from the time when the lifting cylinder 7 is retracted, the jet chisel 30 is operated to extend the lifting cylinder 7 while hitting the pipe wall. The cleaning block moves in the axial direction of the tube, and uses a combination of frictional sliding on the inner surface of the tube wall by the wire brush 29 and impact by the jet chisel 30 to completely remove deposits and clean the tube wall in a band shape with a constant width. Let's do it. When the lifting cylinder 7 reaches a predetermined stroke amount (this becomes the cleaning length in the tube axis direction, this is set in advance using an electrical means such as a timer or switches), the tube axis of the cleaning block The movement in this direction is stopped, and then the cleaning block is moved in the circumferential direction. This movement in the pipe circumferential direction is limited to within the belt-shaped cleaning width described above. This operation of moving the worm 1 in the circumferential direction is performed by driving the rotary cylinder 13 for turning.
5 and the pivot shaft 33 via the worm wheel 16
This is done by rotating. Next, when the elevating cylinder 7 is operated in the retracting direction, the next strip-shaped cleaning is performed while wrapping around the previous cleaning width.

In this way, by combining the operations of the lifting cylinder 7 and the rotating rotary cylinder 13, cleaning is performed in a rectangular wave pattern, and if one cleaning block moves 120 degrees in the circumferential direction of the pipe, a predetermined area within the pipe 1 can be cleaned. Cleaning of the entire circumference is completed. After cleaning is completed, the swinging arm 21 is retracted toward the center of the tube, the clamp heads 3, 3' are retracted, and the whole apparatus is lifted up with a crane and taken out of the tube.

In addition, in the figure, three cleaning blocks each cover 120 degrees, but for other installations, for example, one block can cover 360 degrees.
゜, 180° for 2 pieces, 90° for 4 pieces, etc. Further, although the movement locus of the cleaning block has been shown as an example of a rectangular wave shape, the present invention is not limited to this, and any other arbitrary locus may be used, for example, a method in which cleaning is performed first in the circumferential direction and then shifted in the axial direction one stage at a time, or A method may be adopted in which the lifting cylinder 7 and the rotating rotary cylinder 13 are operated simultaneously to perform cleaning in a spiral manner. Further, if the inside of the pipe is not very firmly adhered, cleaning may be performed only with the wire brush 29 without operating the jet chisel 30. Starting various drive mechanisms,
Stopping and interlocking operations can be performed according to a predetermined program by providing an appropriate control mechanism. Of course, the apparatus of the present invention is not limited to cleaning the inside of a pipe during underwater cutting, but can be applied to cleaning the inside of a pipe in other appropriate conditions.

As explained above, according to the cleaning device of the present invention,
It is possible to completely remove and clean all the deposits attached to the inner surface of the pipe, which is difficult to remove in the past.
Even strong hard deposits such as mortar can be removed. In addition, cleaning work can be done almost automatically, improving work efficiency. Furthermore, in the present invention, since the swinging fulcrum of the swinging arm to which the cleaning block is attached is located at a position different from the center of the pipe, there are advantages such as the ability to respond to changes in pipe diameter by simply changing the swinging angle. be.

[Brief explanation of the drawing]

Fig. 1 is an overall cross-sectional view showing an example of the cleaning device according to the present invention and its usage state, Fig. 2 is a front view showing main parts of the device of the present invention, and Fig. 3 is a perspective view of the portion shown in Fig. 2. , FIG. 4 is a view taken along the line YY' in FIG. 1. 1...Pipe, 2, 2'...Guide roller mechanism, 3,
3'...Clamp head, 4,4'...Link arm, 5...Rotary cylinder, 6...Cylinder guide, 7...Elevating cylinder, 8...Swivel mechanism, 9...Cleaning block drive mechanism, 10... ...Cleaning block, 12...Mounting shaft, 13...Rotary cylinder for rotation, 15...Worm, 16...
... Worm wheel, 17 ... Rotary cylinder for rotation, 21 ... Swinging arm, 23 ... Rotating shaft, 24 ... Floating head, 29 ... Wire brush, 30 ... Jet chisel, 33 ...
...swivel axis.

Claims (1)

[Claims] 1. At one end of the clamp mechanism, which can fix the main body of the device in any direction along the tube axis or circumferential direction at any position on the inner wall of the pipe to be cleaned, the clamp mechanism can be moved in the tube axis direction while being fixed. In addition to connecting a rotating shaft that is large and can be rotated in the direction around the axis,
Around the pivot axis, there is provided a swinging arm extending toward the inner wall of the pipe and having a swinging fulcrum at a position different from the center of the pipe.
1. A device for cleaning hard deposits on an inner surface of a tube, characterized in that a cleaning block having a jet chisel and a brush is attached to the tip of the swing arm.