JPH05185358A - Method and device for removing pipe scale - Google Patents

Abstract

PURPOSE:To facilitate precisely removing scale on a pipe where welding is conducted, simplify the removing work, and enhance the working efficiency. CONSTITUTION:A scale removing method associate with device for embodiment thereof is composed of a pipe rotating and supporting body 1 consisting of a pipe supporting part 3 to support a pipe 2 and rotate it round the axis of its end and a drive part 4 to rotate the pipe supporting part 3 and a grinder 18 which is contacted with the pipe 2 supported by the pipe rotating and supporting body 1 and removes the scale, with which the scale removal from the pipe 2 on its specified position takes place by rotating the pipe 2 and contacting the grinder 18 to the specified part of the pipe rotating.

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 removing a coating or an impurity applied to a pipe, which is an obstacle to the welding, when welding the pipe only by a welding allowance.

[0002]

2. Description of the Related Art There are a wide variety of industries utilizing fluids, such as petrochemicals, petroleum refining, pharmaceuticals, beverages, and the fluids used are diverse from alkaline to acidic. Various steel pipes used in these industries are coated with various coatings so that the inside of the pipe is not corroded by the fluid and the outside of the pipe is not corroded by the atmosphere. However, this coating becomes an obstacle when attempting to weld a pipe, which makes accurate welding impossible. Therefore, as a pre-welding step, the coating on the welded portion of the pipe is removed.

In the work of removing the coating on the welded portion of the pipe, the pipe 58 is generally placed on the two rollers 56 and 57 having no driving force as shown in FIG. 8 in the case of a thick pipe.
Place the grindstone 60 of the hand grinder 59 on the tube 58 to remove it while applying a rotational force to the tube 58. Also, in the case of a thin tube, elbow tube, T tube, cross tube, reducer, etc., use one hand. It is removed by cutting with a hand grinder by holding it or placing it on a table. Then, the length (range) and depth of film removal of the tube are controlled by the operator's eye amount.

[0004]

The removal of the film as a pre-process of pipe welding requires removing only the portion necessary for welding and not removing the unnecessary portion in order to avoid the occurrence of corrosion after welding. According to the removing means of (1), it is difficult to accurately remove only a portion necessary for welding because the grinder is applied in a state where the pipe is not sufficiently supported. Conventionally, the welding precision is more important than the purpose of the coating, and therefore, there are many cases where the coating is excessively cut and removed, and this extra portion causes corrosion. Further, there is a problem that the coating removing work itself is very troublesome work.

In view of the above points, the present invention makes it possible to easily remove the coating film on the welded portion of the pipe with high accuracy, and further to simplify the removal work to improve the work efficiency, thereby removing the coating film on the pipe. A construction method and a film removing device are provided.

[0006]

In order to achieve the above object, the present invention provides a method for removing a coating film on a pipe, such as a straight pipe, an elbow pipe, a T pipe, a cross pipe, or a reducer, which has an end circular shaft. It was rotated about the center, and a grinder was applied to a predetermined portion of the rotating tube to remove the coating from the predetermined portion of the tube.

Further, as a tube coating removing device, a tube support for supporting and rotating a tube such as a straight tube, an elbow tube, a T tube, a cross tube, or a reducer to rotate the tube about its end circle axis center. And a drive unit that rotates the pipe support unit, and a grinder that removes the coating by contacting the pipe supported by the pipe rotation support.

[0008]

The tube is rotated about its end circular axis, and the grinder is applied to a predetermined portion of the rotating tube to remove the coating film at the predetermined portion of the tube. By moving the pipe in the pressing direction with respect to the pipe, it is possible to easily remove the coating film on the inner and outer surfaces of the pipe at a predetermined position by the required length and the required depth.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. 1 to 4 show an embodiment of the present invention, which is a film removing device mainly used when a pipe from which a film is to be removed is a straight pipe. In the figure, 1
Is a tube rotation support that supports and rotates the tube 2, and this tube rotation support 1 is a tube support portion 3 that rotatably supports the tube 2.
And a drive section 4 for rotating the tube 2 supported by the tube support section 3.
It consists of and. The pipe support 3 has a pipe 2 at the top.
And a pressing roller 6 that presses the tube 2 placed on the driving roller 5 so as to sandwich the tube 2 with the driving roller 5. The drive roller 5 is composed of two rollers 7 and 8 arranged in parallel, one roller 7 is rotated by the drive unit 4, and the other roller 8 is rotatable.
By rotating the roller 7 by the
Rotate the tube 2 placed on top. Reference numeral 9 is a motor that serves as the drive unit 4, and 10 is a belt that hangs the shaft 11 of the roller 7 and transmits the rotation of the motor 9 to the roller 7. The drive roller 5 and the motor 9 serving as the drive unit 4 are supported by a frame 12.

The pressing roller 6 is the driving roller 5
Of the driving roller 6 and two rollers 13 and 14 arranged in parallel with the rollers 7 and 8 of the driving roller 6. The rollers 13 and 14 are rotatably and vertically movably supported by the tip of an arm 15 whose one end is rotatably provided on the gantry 12. 16 is the rollers 13, 14
An elevating handle for vertically moving the pressing roller 6 configured in the direction of the drive roller 5, and 17 is a hinge tightening handle.

Reference numeral 18 is a grinder, and 19 is a grindstone. The grinder 18 is supported on a pedestal 20 in parallel with the axis of the tube 2 supported by the tube rotation support 1 and also has X, Y,
It is supported by a movement operation mechanism 21 for moving in the Z direction. The movement operation mechanism 21 moves the grinder 18 up and down.
A direction table 22, a Y-direction table 23 for moving the grinder 18 in the axial direction of the tube 2, and an X-direction table 24 for moving the grinder 18 in a direction orthogonal to the axis of the tube 2.
It consists of and. Reference numeral 25 is a Z-direction operation handle for operating the Z-direction table 22, and 26 is a Y-direction table 23.
A Y-direction operation handle for operating the X-direction table 24 is an X-direction operation handle for operating the X-direction table 24.

Reference numeral 28 is a scale in the Y direction, and 29 is a stopper for restricting movement in the Y direction. 30 is a rail, 31
Reference numeral 32 is a rolling wheel that moves on the rail 30.

According to the above embodiment, the height of the grinder 18 is adjusted by operating the Z-direction operation handle 25 to adjust the Z-direction table 22 with respect to the tube 2 which is supported by the tube rotation support 1 and is rotating. By adjusting the height of the pipe 2 to the height of the pipe 2 and operating the X-direction operation handle 27 to adjust the X-direction table 24, the grindstone 19 of the grinder 18 is pressed against a predetermined position of the pipe 2, and the Y-direction operation handle 26 Is operated to adjust the Y-direction table 23 to move the grinder 18 in the Y-direction, whereby the coating film at a predetermined portion of the pipe 2 can be cut and removed. Since the film on the tube 2 is removed by operating the Z-direction operation handle 25, the X-direction operation handle 27, and the Y-direction operation handle 26, respectively, as described above, the required length and the required depth are obtained. Can be easily and accurately removed by simple work.

FIGS. 5 to 7 show other embodiments of the tube rotary support 1 of the present invention, and each of the tube rotary supports 1 has a rotary shaft 3 rotated by a drive unit 4.
3 and a fixing portion 35 provided on the rotating portion 34 for fixing the tube 2 so that the end circular axis of the tube 2 coincides with the axis of the rotating shaft 33. .

FIG. 5 shows the tube rotation support 1 mainly used when the tube 2 is a large diameter elbow tube. Rotating shaft 33
The rotating portion 34 is fixed to the tip of the. This rotating part 34
Has a plate shape, and the plate surface is orthogonal to the axis of the rotating shaft 33. The fixing portion 35 is provided on this plate surface.
The fixed part 35 is movable in the same direction as the centering frame 36, and the centering frame 36 is supported by the rotating part 34 so as to be movable in a direction orthogonal to the axis of the rotating shaft 33. The tube mounting reference plate 37 supported by the tube mounting reference plate 37, and the tightening body 38 for tightening and fixing the tube 2 mounted on the tube mounting reference plate 37 from both sides.

The centering frame 36 is movably supported on the plate surface of the rotating portion 34 in a direction orthogonal to the axis of the rotating shaft 33 as described above, and is adjusted in the same direction by turning an adjusting screw 39. You can do it. In addition, the pipe placement reference plate 37 is attached to the centering frame 36 as described above.
6 is supported so as to be movable in the same direction as the moving direction of 6, and when one opening end of the elbow pipe 2 is placed on the pipe placement reference plate 37 so as to abut, the center of the opening end is the axis of the rotating shaft 33. It is located on the line of movement of the centering frame 36 that passes through the center, and is arranged so that the other opening end surface faces the direction orthogonal to the axis of the rotating shaft 33. Reference numeral 40 is an adjusting screw for moving and adjusting the pipe placement reference plate 37.

Further, in the tightening body 38, two arms 42 and 43 are provided on a screw rod 41 provided over the centering frame 36, and a handle 44 is operated to rotate the screw rod 41, whereby The arms 42 and 43 are configured to approach and separate from each other, and by the approach of the arms 42 and 43, the elbow pipe 2 placed on the pipe placement reference plate 37 is sandwiched from both sides to fix the elbow pipe 2. It has become. And
The direction of the elbow pipe 2 that is sandwiched and fixed by the arms 42 and 43 from both sides is restricted by the sandwiching by the arms 42 and 43, and the axis of the opening end circle on the side where the coating is removed is the axis of the rotary shaft 33. It is arranged to be parallel to the center and on the moving line of the centering frame 36. Therefore, adjusting screw 3
9 and 40 are adjusted, and the centering frame 36, the tube mounting reference plate 37, etc. are moved and adjusted to adjust the axis of the opening end circle on the film removal side of the elbow tube 2 fixed by the arms 42 and 43 and the rotation. The axis of the shaft 33 can be easily matched.
Reference numeral 45 is a support member that supports the rotating shaft 33.

When the elbow pipe 2 is fixed in this way and the drive unit 4 is driven to rotate the rotary shaft 33, the elbow pipe 2
Rotates about the axis of the opening end circle on the film removal side. In this way, the grindstone 19 of the grinder 18 is applied to a predetermined portion of the rotating elbow pipe 2 to cut and remove the coating.

FIG. 6 shows a tube rotation support 1 used when the tube 2 is an elbow tube having a relatively small diameter. This fixed part 3
The reference numeral 5 designates two support plates 46 and 47 provided on the rotating portion 34 so as to sandwich the axis of the rotary shaft 33, and support plates 46 and 47.
The V-shaped chemical laboratories 48 and 49 are provided so as to face each other, and the tightening handle 50 that moves the support plate 47 toward and away from the support plate 46. Then, set the elbow tube 2 to V
When the elbow pipe 2 is fixed by the V-shaped chemical laboratories 48 and 49, the shaft center of the end circle of the elbow pipe 2 on the coating removal side is the rotation axis. It is arranged so as to coincide with the axial center of 33.

FIG. 7 shows a tube rotation support 1 which is mainly used when the tube 2 is a T tube, a cross tube, a reducer or the like. The fixed portion 35 includes two holding plates 51 and 52 provided on the rotating portion 34 so as to sandwich the axis of the rotating shaft 33.
And a tightening handle 53 for moving the holding plate 52 toward and away from the holding plate 51. Then, V-grooves 54 corresponding to the shape of the tube 2 to be fixed, such as a T tube, a cross tube, and a reducer, are provided on the opposing surfaces of the sandwiching plates 51, 52.
55 is formed so that when the tube 2 is fixed by being sandwiched by the V grooves 54 and 55, the axis of the end circle on the film removal side of the tube 2 coincides with the axis of the rotating shaft 33. It is arranged.

[0021]

As described above, according to the present invention, the tube is rotated about its end circular axis, a grinder is applied to a predetermined portion of the rotating tube, and the coating film at the predetermined portion of the tube is removed. Therefore, by moving the grinder in the axial direction and in the pressing direction with respect to the pipe, the coating on the inner and outer surfaces of the pipe at a predetermined position can be accurately moved by a required length and a required depth. Since it can be easily removed, it is possible to prevent welding defects and corrosion of the pipe due to over-cutting of the coating, and at the same time, even if you are not an expert, you can easily remove the coating. Therefore, the work efficiency is improved, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a view on arrow AA of FIG.

FIG. 4 is a view on arrow BB in FIG. 1.

FIG. 5 is a perspective view showing another example of the present invention.

FIG. 6 is a perspective view showing another example of the present invention.

FIG. 7 is a perspective view showing another example of the present invention.

FIG. 8 is an explanatory view showing a conventional film removing means for a tube.

[Explanation of symbols]

 1 Pipe Rotation Support 2 Pipe 3 Pipe Support 4 Drive 5 Drive Roller 6 Holding Roller 18 Grinder 20 Frame 21 Moving Operation Mechanism 22 Z Direction Table 23 Y Direction Table 24 X Direction Table 33 Rotation Shaft 34 Rotation Unit 35 Fixed Section

Claims (5)

[Claims] 1. A pipe such as a straight pipe, an elbow pipe, a T pipe, a cross pipe, and a reducer is rotated about its end circular axis, and a grinder is applied to a predetermined position of the rotating pipe so that A method for removing a film from a pipe, which is characterized by removing a film at a predetermined location. 2. A pipe support portion for supporting and rotating a pipe such as a straight pipe, an elbow pipe, a T pipe, a cross pipe, and a reducer, and the pipe support portion for rotating the pipe about its end circular axis. A film removing device for a tube, which comprises a tube rotating support composed of a driving unit for rotating the tube, and a grinder for contacting the tube supported by the tube rotating support to remove the film. 3. The tube film removing device according to claim 2, wherein the tube support portion of the tube rotation support comprises a driving roller and a pressing roller for holding the outer circumference of the tube. 4. A tube supporting part of a tube rotating support is attached to a rotating shaft which is rotated by a drive part, and the rotating part is provided on this rotating part, and the tube has an end circular axis centered on said rotating shaft. 3. A fixing part which is fixed so as to coincide with the shaft center.
A device for removing a film from a tube as described. 5. The grinder is supported by a mount so as to be parallel to the axis of the pipe supported by the pipe rotation support, and X,
The pipe film removing device according to claim 2, wherein the pipe film removing device is supported by a moving operation mechanism for moving in the Y and Z directions.