JPH10113792A - Inner clamp device for piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an inner clamp pass through an elbow with a small bending radius. SOLUTION: This clamp device is equipped with a housing case 13 insertable into the elbow 80 with the same diameter as that of piping 11 and supporting a clamp part 14, plural first running wheel 15 and second running wheel 16 arranged respectively at proper intervals in the tube axial direction on one side of the clamp part 14 to move the housing case 13 along the inside surface of the piping 11, and a wheel position adjusting means 17 adjusting independently positions in the tube diameter direction of the first running wheel 15 which is near the clamp part 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe inner clamp apparatus suitable for use in welding pipes, and more particularly to a pipe inner clamp apparatus capable of passing an elbow having a small bending radius.

[0002]

2. Description of the Related Art When relatively large-diameter pipes are butt-connected to each other by welding, it is common to use an inner clamp device in order to correct the position of one of the pipes for centering. As such an inner clamp device, for example, an inner clamp device movable vehicle with a backing member described in Japanese Utility Model Publication No. 6-22559 has been proposed.

[0003] As shown in FIGS. 8 and 9, a moving vehicle with an inner clamp device with a backing member includes a first housing case 103 and a second housing case 1 for holding a backing member 102 attached to a plunger rod 101.
And a plurality of running wheels 105, 106 extending radially in the pipe radial direction.
Has been fixed. The second housing case 104 is fixed to the first housing case 10 by the screw type adjusting means 107.
3 is slidable in the radial direction of the tube.

[0004] In this mobile vehicle 100 with an inner clamp device with a backing member, the plunger rod 101 is extended and the backing member 102 is pressed against the inner surface of the butting portion of the piping, thereby correcting the relative position of one of the pipings and centering the same. can do. Also, the second housing case 104
Is moved to change the relative position between the traveling wheel 106 and the traveling wheel 105, so that it can also be used for piping that is obliquely butted.

[0005] Such an inner clamp device moving vehicle 1
Reference numeral 00 denotes a link between the piston rod and the plunger rod 101 in the housing case 103. As a feature of the link method, the thrust is maximized when the link is almost vertical, but the stroke amount of the plunger rod 101 is usually kept small because the inclination of the link at which the plunger rod 101 can operate is limited. It is.

[0006]

However, in the conventional vehicle 100 for moving the inner clamp device, for example, a bending radius of about 1.5 D (D is the diameter of the pipe) is required in the middle of the pipe.
If a 0 ° elbow was located, it could not be passed.

This is because the plunger rod 1
Since the stroke amount of the inner clamp device 101 is small, the distance between the outer edge of the traveling wheel 105 and the outer peripheral surface of the backing member 102 becomes shorter even if the plunger rod 101 is reduced to the limit. Car 100
This is because when the vehicle travels through the elbow by the traveling wheels 105 and 106, the backing member 102 comes into contact with the outer inner surface in the bending direction of the elbow.

For this reason, the inner clamp device moving vehicle 1
00 can be used in the form of a straight or L-shaped pipe.
There is a problem that the shape is limited to a shape that can take in and out 0.

SUMMARY OF THE INVENTION An object of the present invention is to solve such a problem and to provide an inner clamp device for piping that can pass an elbow having a small bending radius.

[0010]

SUMMARY OF THE INVENTION The present invention is an inner clamp device for piping, and is configured as follows to solve the above-mentioned technical problem. That is, the present invention
By pressing a plurality of clamp heads that can expand and contract in the pipe radial direction against the inner surface of the butted butting portion of the pipe, the inner clamp apparatus for centering the pipe has a diameter equal to that of the pipe. A housing case that can be inserted into an elbow and supports the clamp head, and an appropriate space in the center axis direction of the pipe on one side of the clamp head to move the housing case along the inner surface of the pipe and the elbow. A plurality of first traveling wheels and a plurality of second traveling wheels which are separately provided; and a wheel position adjusting means for independently adjusting a position of the first traveling wheel closer to the clamp head in a pipe radial direction. It is characterized by having. Another wheel position adjusting means for independently adjusting the position of the second traveling wheel in the pipe radial direction can be provided.

[0011] The inner clamp device for piping according to the present invention comprises:
By independently adjusting the position of the first traveling wheel closer to the clamp head in the pipe diameter direction by the wheel position adjusting means, the cylinder passing through the outer edge of the first traveling wheel and the outer peripheral surface of the clamp head are adjusted. The relative position can be shifted in any direction in the pipe diameter direction. Thereby, in a state where the first traveling wheel and the second traveling wheel are in contact with the inner surface of the elbow,
Since the clamp head can be prevented from contacting the inner surface of the elbow, it is possible to pass through the elbow having a small bending radius.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an inner clamping device for a pipe according to the present invention.

FIG. 1 shows an inner clamp apparatus 1 for piping according to the present invention. Inner clamp device 1 for this pipe
Has housings 13 which can be inserted into pipes 11 and 12 having a diameter D to be welded and an elbow 80 (FIG. 6) having the same diameter as the pipes. The housing case 13 includes a clamp portion 14 that can expand and contract in the pipe radial direction of the pipes 11 and 12, and a plurality of first traveling wheels 15 and a second wheel 15 that move the housing case 13 along the inner surfaces of the pipes 11 and 12. A traveling wheel 16 (only one is shown) is provided.

Further, the housing case 13 includes a wheel position adjusting means 17 for independently adjusting the position of the first traveling wheel 15 in the pipe radial direction, a wheel holding portion 18 for supporting the second traveling wheel 16, and a pipe. A temporary fixing pressing rod 19 that can be expanded and contracted in the radial direction is provided.

Here, the configuration of each unit described above will be described in detail. The housing case 13 is formed stepwise by a plurality of cylindrical cases 21 to 25 having different diameters. The control section 26 is provided on the end face of the cylindrical case 25 having the largest diameter.
The wire clamp 70 is attached, and the above-described clamp portion 14 is attached to the center of the outer peripheral surface. A wire hook 71 is also provided on the end face of the cylindrical case 21 having the minimum diameter.

As shown in FIG. 2, a plurality of, in this example, six, clamp portions 14 are respectively provided for the first clamp head 14A and the second clamp head 14B.
It is composed of The first clamp head 14A includes a plunger rod 26 radially attached to the cylindrical case 25, and a first backing member 27A attached to the tip of the plunger rod 26, and the second clamp head 14B includes the plunger rod 26. And the second backing member 27
B. The first backing member 27A and the second backing member 27B are formed in an arc shape in accordance with the inner peripheral surfaces of the pipes 11 and 12.

The first backing member 27A and the second backing member 27B are connected to the abutting portions 65 of the pipes 11 and 12.
In order to be able to press the inner peripheral surface of the first backing member 27A over the entire circumference, the circumferential end surface of the first backing member 27A is formed in a tapered shape with a constriction, and the circumferential direction of the second backing member 27B is formed. Is formed in a tapered shape that expands outward in accordance with the end surface of the first backing member 27A. When the clamp heads 14A and 14B are pulled toward the center, the diameter D1 of the outer peripheral surface 84 (FIG. 6) of the clamp portion 14 is equal to that of the pipes 11 and 1.
2 is smaller than the inner diameter D by a predetermined dimension.

As shown in FIG. 1, the first traveling wheels 15 are arranged near the clamps 14 and are supported by wheel position adjusting means 17, respectively. This first traveling wheel 1
As shown in FIG. 2, for example, four are provided at equal intervals in the circumferential direction, and are respectively disposed between the first clamp head 14A and the second clamp head 14B.

The wheel position adjusting means 17 includes a gate-shaped bracket 30 attached to the second cylindrical case 24 from the right of the housing case 13 in the figure as shown in FIG. A rotary arm 32 rotatably mounted by a shaft 31 and an operation unit 3 capable of rotating the rotary arm 32 by an arbitrary angle
3 is provided.

As shown in FIG. 4, the bracket 30 has a flange 36 mounted in a concave groove 35 on the outer periphery of the cylindrical case 24. The flange 36 has two vertical plates 37
Are erected in parallel at appropriate intervals. An inverted L-shaped support plate 38 is fixed to an outer surface of the vertical plate 37. The lower ends of the support plates 38 on both sides are connected by a horizontal plate 39.
As shown in FIG. 3, a U-shaped shaft holding portion 50 is attached to the middle portion of the support plate 38 at the right end in the drawing, and a bearing hole 52 is provided at the center of the horizontal plate portion 51 of the shaft holding portion 50. Have been.

The rotating arm 32 described above is arranged between the support plates 38 of the bracket 30. In this rotary arm 32, L-shaped arms 40, 40 are arranged in parallel at a slightly wider interval than the width of the first traveling wheel 15, and the left ends of the vertical sides of the arms 40, 40 are connected by a connecting plate 41. Are linked. The bent portions of the arms 40, 40 are rotatably supported on the support plate 38 of the bracket 30 by the rotation shaft 31.

The above-mentioned first traveling wheel 15 is disposed between the distal ends of the lateral sides of the arms 40, 40, and the first traveling wheel 15 is rotatably mounted on the arms 40, 40 with a rotating shaft 42. ing. The outer edge of the first traveling wheel 15 is arranged near the outer peripheral surface of the clamp portion 14. A nut 43 is disposed between the upper ends of the vertical sides of the arms 40, 40.
It is rotatably attached to zero.

The operating section 33 has a screw shaft 55 rotatably inserted into a bearing hole 52 of a shaft holding section 50 of the bracket 30 and handles 56, 57 attached to both ends of the screw shaft 55. I have. A screw portion 58 is provided at an intermediate portion of the screw shaft 55, and the nut 4
3 is screwed. Stoppers 59 and 60 for regulating the position of the nut 43 are also screwed into the screw portion 58. Further, retaining rings 61 and 62 located on both sides of the horizontal plate portion 51 of the shaft holding portion 50 are fixed to the screw shaft 55.

When the right handle 56 of the wheel position adjusting means 17 is rotated clockwise as shown in FIG. 3, the nut 43 of the rotary arm 32 is screwed into the screw portion 58 of the screw shaft 55. Move to the right inside. As a result, the rotating arm 32 rotates clockwise about the rotating shaft 31, and the first traveling wheel 15 moves outward in the pipe radial direction as shown by a two-dot chain line in the figure. Conversely, when the handle 56 is rotated in the counterclockwise direction, the first traveling wheel 15 moves toward the center in the pipe radial direction as shown by the broken line in the figure.

The nut 43 moves up and down with the clockwise or counterclockwise rotation of the rotary arm 32. The amount of this up and down movement is small, and in this example, the nut 43 is absorbed by the looseness and deflection of the screw shaft 55. The nut 43 is connected to the screw portion 58 of the screw shaft 55.
You won't bite. When the amount of vertical movement of the nut 43 is large, the nut 43 can be attached to be rotatable and vertically movable. In addition, the horizontal printing plate 51 can be rotatably mounted and absorbed.

As shown in FIG. 1, the second traveling wheel 16 has the same shape as the first traveling wheel 15 and is spaced a relatively wide distance from the first traveling wheel 15 in the center axis direction of the pipes 11 and 12. It is arranged. As shown in FIG. 5, for example, three second traveling wheels 16 are provided at equal intervals in the circumferential direction. The wheel holding portion 18 that holds the second traveling wheel 16 is formed in a frame shape from a plate material, and is fixed to the cylindrical case 21 of the housing case 13.

At the middle of the wheel holding parts 18, 18, the above-mentioned temporary fixing pressing rod 19 is attached. The temporary fixing pressing rod 19 includes a cylinder 65 radially attached to the cylindrical case 21 and a pad 67 attached to a piston 66 of the cylinder 65.
The inner clamp device 1 can be temporarily fixed to the pipe 11 by extending the piston 66 of the cylinder 65 and pressing the pad 67 against the inner peripheral surface of the pipe 11.

Next, an inner clamp device 1 for this pipe
The operation of will be described. Now, as shown in FIG.
When welding 12 at the butting portion 65, first, the inner clamp device 1 is inserted into the existing pipe 11. The wire 72 attached to the wire hook 70
, The inner clamp device 1 is pulled toward the butting portion 65 side, and is conveyed along the inner surface of the pipe 11 using the first traveling wheel 15 and the second traveling wheel 16, and the central portion of the clamp portion 14 is attached to the end surface of the pipe 11. Substantially match. In this state, the inner clamp device 1 is temporarily fixed by pressing the pad 67 of the temporary fixing pressing rod 19 against the inner peripheral surface of the pipe 11.

Next, the newly installed pipe 12 is arranged in such a manner as to abut the existing pipe 11. Then, as shown in FIG. 2, the plunger 2 of the second clamp head 14B of the clamp portion 14 is used.
6 and the second backing member 27B
5 is pressed against the inner surfaces of the pipes 11 and 12 on both sides. next,
The first backing member 27A of the first clamp head 14A is pressed against the inner surfaces of the pipes 11 and 12. Thereby, the pipes 11 and 12 are centered with each other, and the relative positions are fixed. By welding the butted portion 65 in this state, it is possible to correct the positional displacement of the pipes 11 and 12 and reliably connect the pipes 11 and 12 in a centered state.

As shown in FIG. 6, the inner clamp device 1 can pass a relatively small elbow 80 having a bending radius of about 1.5D (D is a pipe diameter). That is, in this case, the inner peripheral surface 80a at the position 81 corresponding to the first traveling wheel 15 of the elbow 80 and the inner peripheral surface 80b at the position 82 corresponding to the clamp portion 14 correspond to the bending radius R of the elbow 80. Since it is shifted by the dimension d in the bending direction, if the positions of the first traveling wheel 15 and the clamp portion 14 can be adjusted to this shift, it is possible to prevent the clamp portion 14 from contacting the inner peripheral surface 80b of the elbow 80. it can.

For this reason, in the inner clamp device 1, the position of each first traveling wheel 15 in the pipe diameter direction is independently adjusted by the wheel position adjusting means 17, respectively.
As shown in the figure, the cylinder 83 passing through the outer edge of each of the first traveling wheels 15 abutting on the inner peripheral surface 80a is displaced outwardly in the bending direction of the elbow 80 with respect to the outer peripheral surface 84 of the clamp portion 14. It is shifted by the same amount as the minute d.

Thus, when the inner clamp device 1 is inserted into the elbow 80, the first traveling wheel 15 and the second traveling wheel 16 come into contact with the inner surface of the elbow 80, and the clamp portion 14 comes into contact with the inner surface of the elbow 80. Because it is gone, the first
The traveling wheel 15 and the second traveling wheel 16 allow the inner clamp device 1 to smoothly pass through the inside of the elbow 80.

As described above, the inner clamp device 1 of the pipe can adjust the elbow 80 having a small bending radius by independently adjusting the position of each first traveling wheel 15 in the pipe radial direction by the wheel position adjusting means 17. Since it can be passed, it can be applied to welding of a piping system having a complicated shape, and rationalization of welding work can be achieved. Further, since the relative position of the first traveling wheel 15 and the clamp portion 14 in the pipe diameter direction can be shifted in an arbitrary direction, it can be used even when the elbow 80 is bent in any direction.

Further, since the handles 56 and 57 of the operation section 33 are on both sides of the screw shaft 55, the pipes 11 and
Since operation can be performed from both of the 12 openings, operability is improved. Further, it can be used even when the pipes 11 and 12 are obliquely butted against each other.

In the above-described embodiment, the case where the elbow 80 having a bending radius R of about 1.5 times the pipe diameter D is passed has been described, but the pipe diameter of the first traveling wheel 15 by the wheel position adjusting means 17 is described. By increasing the position adjustment amount in the direction, an elbow having a bending radius R smaller than 1.5D can be passed. Further, in the present embodiment, the wheel position adjusting means 17 is used for adjusting the position of the first traveling wheel 15 in the pipe radial direction, but an appropriate means such as a cylinder, a jack or a motor can be used instead.

Further, the inner clamp device 1 can be provided with another wheel position adjusting means for adjusting the position of the second traveling wheel 16 in the pipe diameter direction. This makes it easier to align the center axis of the inner clamp device 1 with the center axis of the pipe when centering the pipe.
Even when the pipe diameter D changes due to the flatness of the pipes 11, 12 or the elbow 80 or a change in the plate thickness, it is possible to quickly respond by a simple operation.

[0037]

As described above, according to the pipe inner clamp device of the present invention, the first traveling wheel is independently adjusted by the wheel position adjusting means in the radial direction of the first traveling wheel to thereby achieve the first traveling. The relative position between the cylinder passing through the outer edge of the wheel and the outer peripheral surface of the clamp head can be shifted in the pipe diameter direction. As a result, an elbow with a small bending radius can be passed, so that the present invention can be applied to welding of a piping system having a complicated shape, and the welding work can be streamlined.

Further, since the relative position of the first traveling wheel and the clamp head in the pipe diameter direction can be shifted in an arbitrary direction, it can be used even when the elbow is bent in any direction.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an inner clamp device for piping according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a diagram showing wheel position adjusting means of the inner clamp device for piping according to the present invention.

FIG. 4 is a view taken in the direction of arrow B in FIG. 3;

FIG. 5 is a sectional view taken along the line CC of FIG. 1;

FIG. 6 is a view for explaining the operation of the inner clamp device for piping according to the present invention.

FIG. 7 is a sectional view taken along line DD of FIG. 6;

FIG. 8 is a view showing a moving vehicle of an inner clamp device according to a conventional example.

FIG. 9 is a sectional view taken along the line EE of FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner clamp apparatus of piping 11 and 12 Piping 13 Housing case 14 Clamp part 14A 1st clamp head 14B 2nd clamp head 15 1st traveling wheel 16 2nd traveling wheel 17 Wheel position adjusting means 65 Butting part 80 Elbow

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Isamu Yahagi 1-52 Heiwamachi A201, Heiwacho, Chigasaki-shi, Kanagawa Prefecture Person Masatoshi Kodera 2-8-65 Yoshinodai, Kawagoe-shi, Saitama Pref.

Claims (2)

[Claims] 1. An inner clamp apparatus for centering a pipe by pressing a plurality of clamp heads which can be expanded and contracted in a pipe radial direction against an inner surface of a butt portion of the pipe arranged to butt. A housing case that can be inserted into an elbow having the same diameter as the pipe and supports the clamp head; and a central axis direction of the pipe on one side of the clamp head for moving the housing case along the inner surface of the pipe and the elbow. A plurality of first traveling wheels and second traveling wheels respectively arranged at appropriate intervals, and a wheel position for independently adjusting a position in a pipe radial direction of the first traveling wheel closer to the clamp head. An inner clamp device for piping, comprising an adjusting means. 2. The piping inner clamp device according to claim 1, further comprising another wheel position adjusting means for independently adjusting the position of the second traveling wheel in the pipe radial direction.