KR101180866B1 - Buffing machine for inside surface of large size pipe - Google Patents

Abstract

PURPOSE: A buffing apparatus for buffing an inner peripheral surface of a large-diameter steel pipe is provided to minimize roughness difference because all sides of a buffing belt are evenly contacted to the inner diameter of a large-diameter steel pipe. CONSTITUTION: A buffing apparatus for buffing an inner peripheral surface of a large-diameter steel pipe comprises first and second moving trolleys(210,220), a boom(130), a buffing head, and a buffing belt. The first and second moving trolleys are separated at a predetermined interval according to the length of a large-diameter steel pipe(10) and move the large-diameter steel pipe to a vertical support plate(110). The boom and the buffing head are inserted in the inner circumference of the large-diameter steel pipe and the buffing belt buffs the inner circumference of the large-diameter steel pipe. While the first and second moving trolleys rotate the large-diameter steel pipe in place, a buffed part of the large-diameter steel pipe is changed and the boom gradually moves into the large-diameter steel pipe, thereby buffing all the part of the inner circumference of the large-diameter steel pipe.

Description

BUFFING MACHINE FOR INSIDE SURFACE OF LARGE SIZE PIPE}

The present invention relates to a buffing apparatus for buffing the inner circumferential surface of large diameter steel pipes.

Recently, due to the rapid growth of the offshore plant sector, the need for large diameter steel pipes is emerging.

Looking at the type of steel pipe, depending on the presence of the weld (welding bead) is roughly divided into a seamless pipe (Seamless pipe) and a joint steel pipe.

Non-bare steel pipes have no welds in the pipe and have good internal roughness. However, since no-tree steel pipe is mainly manufactured by drawing, it is impossible to manufacture large diameter thick steel pipe. In particular, it is not possible to manufacture large diameter steel pipes with a diameter of 508 mm or more and have a sufficient thickness suitable for high pressure while using a non-bare steel pipe.

Meanwhile, a submerged arc welded pipe (SAW steel pipe), which is a kind of bonded steel pipe, can be easily manufactured in large diameters, and in the case of using thick steel sheets, it is also easy to manufacture large diameter thick pipes. However, in the case of SAW steel pipe, there is a welding part (welding bead), so that the welding part may have a relatively non-uniform thickness, and there is a problem that the roughness of the inner circumferential surface is very rough.

Due to this technical situation, the need for arc welded steel pipes made of large diameter steel pipes has been rapidly increasing, having a quality level equivalent to that of large diameter steel pipes required for offshore plant, in particular, non-wood steel pipes.

The present invention particularly belongs to a technique for producing an arc welded steel pipe having an inner circumferential surface with roughness equivalent to that of a treeless steel pipe.

On the other hand, as a conventional technology for the buffing device, Korean Patent Laid-Open No. 2000-0072322 "Polishing apparatus and polishing method" (2000.12.5 publication) and Korean Patent Publication No. 1993-0012197 "Cylinder inner surface buffing device" ) Has been proposed.

Korean Patent Publication No. 2000-0072322 "Polishing apparatus and polishing method" (2000.12.5 published) Korean Unexamined Patent Publication No. 193-0012197 "Cylinder inner surface buffing device" (published 13.7.20)

As described above, the present invention relates to an apparatus for manufacturing a steel pipe having an inner circumferential surface having a roughness equivalent to that of a non-tree-like steel pipe while being a bonded steel pipe, and more particularly, to a buffing device for buffing an inner circumferential surface of a bonded steel pipe manufactured to a large diameter. .

In order to solve the above problems, the present invention is a buffing apparatus for buffing the inner circumferential surface of a large diameter steel pipe, comprising: a vertical support standing vertically; A boom support guided along the vertical support to be movable up and down; Boom support vertical movement means provided for moving the boom support up and down; A boom guided along the boom support and provided to be movable in a left and right direction, one end of which is disposed toward one end of a large diameter steel pipe; Left and right boom moving means provided to move and move the boom in left and right directions; A buffing head having one end rotatably provided at one end of the boom; Buffing means provided on the buffing head to buff an inner circumferential surface of a large diameter steel pipe; Distance sensing means provided on the buffing head to sense a distance from an inner circumferential surface of a large diameter steel pipe; Buffing head pivoting means provided to pivotally drive the buffing head with respect to the boom; The buffing head pivoting means rotates the buffing head so that the buffing head is inclined with respect to the boom according to the distance sensed by the distance sensing means so that the buffing means can be in close contact with the inner circumferential surface of the large diameter steel pipe. Buffing head rotation control unit for controlling; A first turning roller for rotating the large diameter steel pipe in place while supporting the outer circumferential surface of the large diameter steel pipe, a first turning roller rotating means for rotating the first turning roller, and being rotated in contact with the other end of the large diameter steel pipe A first moving trolley comprising an end supporting roller; A second turning roller provided between the first moving bogie and the vertical support and rotating the large diameter steel pipe in place while supporting the outer circumferential surface of the large diameter steel pipe; and a second turning roller rotating means for rotating the second turning roller. A second moving balance comprising; And a control unit.

The buffing head rotating means may include a buffing head rotating motor, a worm rotated by the buffing head rotating motor, and a worm wheel geared with the worm.

The buffing means may include a driving wheel rotatably provided at the buffing head, a driven wheel rotatably provided at the buffing head, a buffing belt wound around the driving wheel and the driven wheel, It may include a drive wheel drive motor for rotating the drive wheel.

As described above, it is possible to manufacture a steel pipe having an inner circumferential surface having a roughness equivalent to that of a bonded steel pipe and a non-tree-based steel pipe as described above.

1 is a plan view of a buffing apparatus according to an embodiment of the present invention;
2 is a front conceptual view of FIG. 1;
3 is a plan view showing before and after assembly of the boom and the buffing head;
4 is a front view showing before and after assembly of the boom and the buffing head,
5 is a perspective view for showing the relationship between the worm, the worm wheel, the rotation axis which is part of the buffing head rotating means;
6 is a view for showing the relationship between the drive wheel, the driven wheel, the buffing belt which is part of the buffing means;
7 is a corresponding view of FIG. 2 with the buffing means performing buffing.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention in the drawings, portions not related to the description are omitted, and like reference numerals are given to similar portions throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise.

1 is a plan view of a buffing apparatus according to an embodiment of the present invention, Figure 2 is a front conceptual view of Figure 1, Figure 3 is a plan view showing before and after assembly of the boom and buffing head, Figure 4 is a boom and buffing head Figure 5 is a front view showing before and after assembly of, Figure 5 is a perspective view for showing the relationship between the worm, the worm wheel, the rotating shaft which is part of the buffing head rotating means, Figure 6 is a part of the buffing means of the driving wheel, driven wheel, buffing belt FIG. 7 is a diagram showing a relationship, and FIG. 7 is a corresponding diagram of FIG. 2 with a buffing means performing buffing.

In the present embodiment, the large diameter steel pipe 10 to be processed is a SAW steel pipe, and weld beads protruding from the inner circumferential surface of the SAW steel pipe are removed in advance in another process.

This buffing device is largely composed of a vertical support 110, boom support 120, boom 130, buffing head 140, the first moving cart 210, the second moving cart 220 and the like.

The vertical support 110 is erected vertically, one side of the vertical support 110 is provided with a boom support 120.

The boom support 120 is guided along the vertical support 110 and is provided to be movable up and down. In addition, the vertical support 110 is provided with a boom support vertical movement means for moving the boom support 120 up and down.

In this embodiment, the boom support vertical movement means to move the boom support 120 up and down along the chain rotated by the drive motor and the drive motor is only one embodiment, the boom support vertical movement means can be variously changed Do.

The boom support vertical movement means serves to move the boom support 120 to a predetermined height in accordance with the floor height of the inner circumferential surface of the large diameter steel pipe 10 that is the buffing target.

The boom support 120 is provided with a boom 130 having a long length in the horizontal direction.

In addition, the boom 130 is guided along the boom support 120 is provided to be movable in the left and right directions.

One end of the boom 130 is to be inserted into the inner circumference of the large diameter steel pipe 10 and is disposed toward one end of the large diameter steel pipe 10, and the longitudinal direction of the boom 130 is parallel to the centerline of the large diameter steel pipe 10. Is placed.

As described above, the boom support 120 is provided with boom left and right moving means for moving the boom 130 in left and right directions so that the boom 130 moves along the inside of the large-diameter steel pipe 10. In the present embodiment, the boom left and right moving means provided a pinion to be rotated by the drive motor to the boom support 120, and to form a rack coupled to the pinion and pinion rack on the boom 130, this is only one example and very Various changes are possible.

One end of the buffing head 140 is rotatably provided at one end of the boom 130.

Due to the rotatable coupling structure of the buffing head 140, the buffing head 140 may be inclined with respect to the boom 130. That is, the boom 130 always maintains a horizontal state, and the buffing head 140 may change to a horizontal state or an inclined state with respect to the boom 130.

In addition, the buffing head rotating means is provided to rotate the buffing head 140 with respect to the boom as described above. In the present embodiment, the buffing head pivoting means includes a buffing head pivoting motor 151, a worm 152, and a worm wheel 153.

The structure of the buffing head pivoting means will be described with reference to FIGS. 3 to 4.

This embodiment adopts the coupling between the worm 152 and the worm wheel 153 to suppress the vibration of the buffing head 140 in spite of the vibration generated in the buffing process, thereby driving the buffing head rotating motor 151 The buffing head 140 is rotated, but adopts a structure in which the buffing head 140 is not rotated with respect to the boom 130 by an external force applied to the buffing head 140.

In this embodiment, the buffing head rotating motor 151 is provided in the buffing head 140, and the worm 152 is rotated by the buffing head rotating motor 151 and has a relatively fixed posture with respect to the buffing head 140. Have A plurality of reduction gears may be provided between the water worm 152 and the buffing head rotating motor 151.

In addition, the rotating shaft 154 is fixed to one end of the boom 130, the worm wheel 153 is fixed to both ends of the rotating shaft 154, the buffing head 140 is rotatably coupled to the rotating shaft 154. .

Therefore, when the buffing head rotating motor 151 rotates the worm 152, the buffing head 140, the buffing head rotating motor 151 and the worm 152 mounted thereon rotate about the rotation shaft 154.

In the present embodiment, a pair of buffing head rotating motors 151, worms 152, and worm wheels 153 are provided with respect to one rotation shaft 154, thereby enabling stable rotation of the buffing head 140. . This is because unintentional vibration of the buffing head 140 has an unexpected adverse effect on the roughness of the inner circumferential surface of the steel pipe.

Buffing means is provided in the buffing head 140 as described above.

4 and 6, the buffing means includes a driving wheel 161 rotatably provided in the buffing head 140 and a driven wheel 162 rotatably provided in the buffing head 140. ), A buffing belt 163 wound around the driving wheel 161 and the driven wheel 162, and a driving wheel driving motor 164 provided in the buffing head 140 to rotate the driving wheel 161. It is done by

As described above, the buffing belt 163 is rotated along the driving wheel 161 and the driven wheel 162 by the driving wheel driving motor 164, so that the surface of the buffing belt 163 is formed on the inner circumferential surface of the large-diameter steel pipe 10. Will buff

On the other hand, the buffing head 140 is provided with a distance detecting means 171 for detecting the distance to the inner circumferential surface of the large diameter steel pipe (10). As the distance detecting means 171, a laser range finder may be adopted. The distance detecting means 171 is provided to detect a change in the inner circumferential surface of the steel pipe 10 to be buffed.

That is, in the case of large diameter steel pipe 10, in particular, arc welded steel pipe, its inner circumferential surface does not maintain a perfectly horizontal state and is often curved in an inclined state at the top or bottom.

In this case, the change in the inner circumferential surface of the large diameter steel pipe 10 may be predicted according to the change in the distance measured by the distance detecting means 171.

In addition, the distance sensed by the distance detecting means 171 is transmitted to the buffing head rotation controller (not shown).

The buffing head rotation controller calculates the distance change through the distance detected by the distance detecting means 171, and stores each distance change and the slope of the buffing head 140 corresponding thereto in a database form, and calculates the calculated distance change. As a result, the buffing head pivoting means controls the buffing head 140 to be rotated so that the buffing head 140 is inclined with respect to the boom 130.

As a result, the buffing means, specifically, the buffing belt 163 may be in close contact with the inner circumferential surface of the large-diameter steel pipe 10 to maintain the buffing state.

That is, the buffing belt 163 is typically rotated in a vertical state, but when the inner circumferential surface of the large diameter steel pipe 10 is inclined, the buffing belt 163 is inclined together to correspond to the inclined angle so that the buffing belt 163 is in close contact with the large diameter steel pipe 10. Will perform.

In the above description, reference numeral 172 denotes a lighting device, and reference numeral 173 denotes a camera.

Meanwhile, the first moving cart 210, the second moving cart 220, and the rail 230 are provided to support the large diameter steel pipe 10 and to rotate the large diameter steel pipe 10 in place.

A pair of rails 230 are provided on the bottom surface, and the rails 230 are disposed in parallel with the boom 130.

The first and second moving carts 210 and 220 are provided on the rail 230.

The first moving cart 210 supports the left end of the large-diameter steel pipe 10 (see FIG. 1), and the second moving cart 220 supports the right end of the large-diameter steel pipe 10 (see FIG. 1). do.

The first moving trolley 210 is provided with a first turning roller for rotating the large diameter steel pipe in place while supporting the outer circumferential surface of the large diameter steel pipe, and a first turning roller rotating means for rotationally driving the first turning roller, and the rail 230 There is provided a first wheel for rotationally moving along the first wheel, and a first wheel rotation means for rotationally driving the first wheel.

The second moving cart 220 is also provided with a second turning roller for rotating the large diameter steel pipe in place while supporting the outer circumferential surface of the large diameter steel pipe, and a second turning roller rotating means for rotationally driving the second turning roller, and the rail 230 A second wheel that rotates along the rotation and a second wheel rotation means for rotationally driving the second wheel is provided.

The first and second moving trolleys 220 are moved to an appropriate position according to the length of the large diameter steel pipe 10, and also rotates the large diameter steel pipe 10 in place during the buffing operation.

Since the first moving cart 210 and the second moving cart 220 as described above are generally adopted in the processing of a general large diameter steel pipe, detailed descriptions thereof will be omitted.

On the other hand, the first moving cart 210 is provided with an end support roller 211 which is in contact with the other end of the large diameter steel pipe 10 and rotates together with the large diameter steel pipe 10.

The large diameter steel pipe 10 is prevented from moving in the left direction (refer to FIG. 1) by the end support roller 211, and the first turning roller and the second turning roller rotate the large diameter steel pipe 10 in place. If the shape is formed so that the movement force in the left direction is applied, the large-diameter steel pipe 10 can be rotated in place without movement in the left and right directions by the end support roller 211.

The first and second moving trolleys 210 and 220 are spaced at appropriate intervals according to the length of the large diameter steel pipe 10 to be processed, and then the large diameter steel pipe 10 is moved to the vertical support 110 side.

Thereafter, the boom 130 and the buffing head 140 are inserted into the inner circumference of the large diameter steel pipe 10, and the buffing belt 163 buffs the inner circumferential surface of the large diameter steel pipe 10.

In addition, the first and second moving trolleys 210 and 220 rotate the large diameter steel pipe 10 in place so that the buffing portion of the large diameter steel pipe 10 is varied, and the boom 130 gradually increases the large diameter steel pipe 10. Entering inside, as a result, all parts of the inner circumferential surface of the large-diameter steel pipe 10 are buffed.

On the other hand, the present applicant, in order for the inner circumferential surface of the arc welded steel pipe to have the same level of roughness as the steelless steel pipe, the buffing belt 163 should be in close contact with a sufficient pressure on the large diameter steel pipe 10, and the large diameter steel pipe 10 It was confirmed that the entire inner circumferential surface should be in contact with the buffing belt 163 at an equivalent level.

To this end, in the present invention, the portion of the buffing head 140 supported by the large-diameter steel pipe is only the buffing belt 163, and the inclination of the buffing belt 163 is the distance detected by the distance detecting means 171, that is, the large diameter. The inner circumferential surface of the steel pipe was changed so as to correspond to the change, so that all surfaces of the buffing belt 163 were in contact with the inner circumferential surface of the large diameter steel pipe 10 as equally as possible.

As a result, the inner circumferential surface of the large-diameter steel pipe has the same level of roughness as the treeless steel pipe, and the deviation of the roughness is also extremely small.

The foregoing description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be. It is therefore to be understood that the embodiments described above are intended to be illustrative, but not limiting, in all respects. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

10: large diameter steel pipe
110: vertical support
120: boom support
130: boom
140: Buffing Head
151: buffing head rotating motor 152: worm
153: worm wheel 154: rotation axis
161: drive wheel 162: driven wheel
163: buffing belt 164: driving wheel drive motor
171: distance detection means
210: first moving cart 211: end support roller
220: second mobile truck
230: rail

Claims (3)

In the buffing device for buffing the inner circumferential surface of large diameter steel pipes:
Vertical supports erected vertically;
A boom support guided along the vertical support to be movable up and down;
Boom support vertical movement means provided for moving the boom support up and down;
A boom guided along the boom support and provided to be movable in a left and right direction, one end of which is disposed toward one end of a large diameter steel pipe;
Left and right boom moving means provided to move and move the boom in left and right directions;
A buffing head having one end rotatably provided at one end of the boom;
Buffing means provided on the buffing head to buff an inner circumferential surface of a large diameter steel pipe;
Distance sensing means provided on the buffing head to sense a distance from an inner circumferential surface of a large diameter steel pipe;
Buffing head pivoting means provided to pivotally drive the buffing head with respect to the boom;
The buffing means is in close contact with the inner circumferential surface of the large diameter steel pipe so as to buff
A buffing head pivoting control unit which controls the buffing head pivoting means to rotate the buffing head so that the buffing head is inclined with respect to the boom according to the distance sensed by the distance sensing means;
A first turning roller for rotating the large diameter steel pipe in place while supporting the outer circumferential surface of the large diameter steel pipe, a first turning roller rotating means for rotating the first turning roller, and being rotated in contact with the other end of the large diameter steel pipe A first moving trolley comprising an end supporting roller;
A second turning roller provided between the first moving bogie and the vertical support and rotating the large diameter steel pipe in place while supporting the outer circumferential surface of the large diameter steel pipe; and a second turning roller rotating means for rotating the second turning roller. A second moving balance comprising;
Buffing device for buffing the inner circumferential surface of the large diameter steel pipe, characterized in that comprises a.
The method of claim 1,
The buffing head rotating means includes a buffing head rotating motor, a worm that is rotated by the buffing head rotating motor, and a worm wheel that is geared with the worm. A buffing for buffing an inner circumferential surface of a large diameter steel pipe Device.
The method of claim 1,
The buffing means includes a drive wheel rotatably provided in the buffing head, a driven wheel rotatably provided in the buffing head, a buffing belt wound around the drive wheel and the driven wheel, and the drive wheel. A buffing device for buffing the inner circumferential surface of a large diameter steel pipe, characterized in that it comprises a drive wheel drive motor for rotationally driven.

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