JPH08267293A - Tab plate positioning device - Google Patents

Abstract

PURPOSE: To provide a tab plate positioning device which is simple in construction, does not require clamping of a tap plate and is used for a large-diameter welded steel pipe, such as UOE steel pipe. CONSTITUTION: This tab plate positioning device has a tab plate supporting plate 3 mounted with the tab plate 1, a fluid cylinder 4 for lifting to push up this tab plate supporting plate 3 until the plate comes into contact with the inside surface or outside surface of a pipe end and a fluid cylinder 5 for pressing to press the front end face 1a of the tab plate 1 on the tab plate supporting plate 3 until the front end faces is pressed to the end face 2a of the pipe. The device positions the tab plate 1 to be welded to the end face 2a of the steel pipe 2 to be welded. A pressing roll 7 having a revolving shaft 7a perpendicular to the front end of the fluid cylinder 5 for pressing is mounted at this tab plate positioning device, by which the front end face 1a of the tab plate 1 is surely pressed to the end face 2a of the pipe even if the tab plate 1 is not exactly square.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tab plate positioning device used for large diameter welded steel pipes such as UOE steel pipes.

[0002]

A large diameter welded steel pipe such as a UOE steel pipe is a welded steel pipe formed into a cylindrical shape (hereinafter simply referred to as a steel pipe).
It is manufactured by welding the seam of
In welding the seam, it is necessary to weld a tab plate (small steel piece) to the end of the groove in advance in order to completely weld the pipe end.

As a device for positioning the tab plate in the welding operation, as shown in FIG. 5, a pipe end surface 2 of a steel pipe 2 is used.
A tab plate supporting plate 3 on which the tab plate 1 to be welded to a is mounted, and an upper surface of the tab plate supporting plate 3 is pushed up and down until it comes into contact with the outer surface 2c (or inner surface) of the pipe end where the groove 2b is located. Fluid pressure cylinder 4 and tab plate 1 on tab plate support plate 3
, A pressing fluid pressure cylinder 5 for pressing the tab plate 1 in the axial direction of the pipe indicated by the arrow A so that the front end face 1a of the above abuts the pipe end face 2a (for example, Japanese Patent Laid-Open No. 50-1046).
No. 55-126397, etc.).

By the way, as shown in FIG. 6, the tab plate 1 is made from a thick plate by using a gas cutting machine or the like.
It is cut out to a size of 5 mm and length L of 200 ± 5 mm, but its shape is not always an accurate square due to a machining error, and each corner A, B, C, D
The squareness at is not good and is generally trapezoidal or other quadrilateral.

In the case of the tab plate 1 having such a shape, for example, as shown in FIG. 7A, a point P on the rear end face 1b of the tab plate 1 is shown.
_When the front end of the piston rod 5a of the pressing fluid pressure cylinder 5 is directly contacted with 1 and pushed out in the direction of arrow A, when the front end face 1a of the tab plate 1 is pressed against the pipe end face 2a of the steel pipe 2, the tab plate 1 The corner portion A of the steel pipe 2 is in contact with the pipe end surface 2a of the steel pipe 2.

Then, the front end face 1a of the tab plate 1 and the pipe end face 2
In order to bring them into close contact with a, as shown in FIG. 7 (b), the tab plate 1 is horizontally rotated in the direction of arrow B with the corner portion A contacting the pipe end surface 2a as a fulcrum, and at the same time, the piston rod 5a is rotated. point over the rear end face 1b tip of the tab plate 1 in the direction of arrow c, slides overcomes the sliding friction force acting between them, the contact point of the distal end of the piston rod 5a from the point P ₁ or is moved to P _2, or, as shown in FIG. 7 (c), the corner portion a
Slides in the direction of arrow D, that is, from point A ₁ to point A ₂ by overcoming the sliding frictional force acting between the pipe end face 2a and at the same time horizontally rotating in the direction of arrow E with corner A as a fulcrum. By doing so, the front end face 1a of the tab plate 1 and the pipe end face 2a are brought into contact with each other.

[0007]

However, in general,
Considering the roughness of the end face of the tab plate 1 to be gas-cut and the finishing accuracy of the pipe end face 2a, between the tip of the piston rod 5a of the pressing fluid pressure cylinder 5 and the rear end face 1b of the tab plate 1, and the pipe. It is considered that the frictional force acting between the end surface 2a and the front end surface 1a of the tab plate 1 is considerably large, and the tab plate 1 hardly causes any of the above-described movements. It is difficult to adhere to 2a. Then, the front end face 1a of the tab plate 1 does not adhere to the pipe end face 2a,
For example, if a gap of 1 mm or more is formed, welding becomes impossible or causes welding failure.

As a device for solving such a problem, for example, Japanese Utility Model Laid-Open No. 60-113193 discloses a mechanism for clamping a tab plate and pressing it against a pipe end face, with a turning angle of ± 10 °.
It is disclosed that the horizontal rotation function in the range of 1 is provided. However, since this device is provided with a clamp mechanism, a horizontal rotation mechanism, and the like, the device is not only complicated, but also has a problem that it takes time to clamp the tab plate, which is not practical.

The present invention has been made to solve the above problems of the prior art. The structure is simple, it is not necessary to manually clamp the tab plate, and moreover, the tab plate is securely attached to the end surface of the pipe. An object of the present invention is to provide a tab plate positioning device that can bring the front end faces into close contact with each other.

[0010]

In order to achieve the above object, the present invention is an apparatus for positioning a tab plate to be welded to a pipe end surface of a steel pipe to be welded, the tab plate supporting plate having the tab plate mounted thereon. And elevating means for pushing the tab plate support plate up to contact the inner surface or outer surface of the tube end, and pressing in the tube axial direction so that the front end surface of the tab plate on the tab plate support plate contacts the tube end surface. A tab plate positioning device comprising a pressing means, wherein a pressing roll having a vertical rotation shaft capable of rollingly contacting a rear end surface of the tab plate is attached to the pressing means. Is.

In place of the pressing roll, the pressing means has a box body whose surface facing the tube end surface is released, and a front part of the box body which is housed in the box body and projects from the box body. A pressing head formed of a deformable elastic bag body in which a fluid is sealed may be attached to.

[0012]

[Advantage] According to the present invention, since the pressing means used for the positioning device of the tab plate to the end of the steel pipe is provided with the pressing roller which can be freely rolled or the deformable pressing head, the tab which is not an accurate rectangular tab can be attached. Even with a plate, the front end face of the tab plate can be reliably brought into close contact with the pipe end face of the steel pipe.

[0013]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a side sectional view showing the structure of an embodiment of the present invention. In the drawings, the same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted. As shown in this figure, the tab plate positioning device of the present invention is similar to the conventional example in that the tab plate support plate 3 on which the tab plate 1 is mounted and the upper surface of the tab plate support plate 3 are brought into contact with the pipe end surface 2 a of the steel pipe 2. So that the fluid pressure cylinder 4 for lifting and lowering and the front end face 1a of the tab plate 1 on the tab plate support plate 3 are brought into contact with the pipe end face 2a,
It is composed of a pressing fluid pressure cylinder 5 for pressing the tab plate 1 in the tube axis direction indicated by an arrow a. A supporting member 6 is attached to the tip of the piston rod 5a of the pressing fluid pressure cylinder 5 and the supporting member 6 is attached. A pressing roll 7 having a rotating shaft 7a perpendicular to the member 6 is rotatably supported.

Then, with this tab plate positioning device, the steel pipe 2
The operation for positioning the tab plate 1 that is not exactly rectangular as shown in FIG. 6 above on the tube end surface 2a is performed in the following order. (1) When the groove 2b is located on the lower side of the steel pipe 2, the lifting fluid pressure cylinder 4 is operated to raise the tab plate support plate 3, and a part of the upper surface of the pipe end portion of the steel pipe 2 It is raised until it comes into contact with the outer surface 2c (see FIG. 1). When the groove 2b is located on the upper side of the steel pipe 2, the elevated position of the tab plate support plate 3 is brought into contact with the inner surface of the steel pipe 2.

(2) Using an industrial robot (not shown) equipped with a magnet or the like at the tip of the arm, the tab plate 1 stored in a nearby storage location is placed on the top surface of the tab plate support plate 3 and It is placed so that the center in the longitudinal direction coincides with the center of the groove 2b. (3) Operate the pressing fluid pressure cylinder 5 to move the pressing roll 7
Is brought into contact with the rear end face 1b of the tab plate 1 placed on the upper face of the tab plate support plate 3, moved in the direction of arrow a, and pressed against the pipe end face 2a of the steel pipe 2. At this time, for example, as shown in FIG. 2 (a), even if the corner portion A of the front end surface 1a of the tab plate 1 comes into contact with the tube end surface 2a first, the pressing roll 7 rolls in the direction of arrow a. While continuing to push the rear end surface 1b of the tab plate 1, the tab plate 1
Rotates horizontally in the direction indicated by the arrow B with the corner A as a fulcrum. As a result, as shown in FIG. 2 (b), its front end face 1a
Can be brought into close contact with the tube end surface 2a.

FIG. 3 is a side sectional view showing the structure of another embodiment of the present invention, in which a pressing head 8 is used in place of the pressing roll 7 in the above embodiment. The pressing head 8 has a box body 9 whose surface facing the tube end surface 2a is open,
A first half of the elastic bag body 10 is housed inside the box body 9 so that the front half part of the elastic bag body 10 projects from the box body 9 and is exposed.

With this structure, when the pressing fluid pressure cylinder 5 is operated to position the tab plate 1 having an accurate non-rectangular shape, as shown in FIG. 4 (a),
When the pressing head 8 is brought into contact with the rear end face 1b of the tab plate 1 and is moved in the direction of arrow a and pressed against the pipe end face 2a of the steel pipe 2, the pipe end face 2a of the steel pipe 2 is attached to the corner of the front end face 1a of the tab plate 1. Even if the corner portion A first comes into contact, the elastic bag body 10 continues to push the rear end surface 1b of the tab plate 1 while being freely deformed, so that the tab plate 1 is horizontal in the direction indicated by the arrow B with the corner portion A as the fulcrum. Rotate.
As a result, as shown in FIG. 4 (b), the front end face 1 of the tab plate 1 is
It is possible to bring a into close contact with the tube end surface 2a.

In the embodiment described above, the lifting fluid pressure cylinder 4 is used to raise and lower the tab plate support plate 3, and the pressing fluid pressure cylinder 5 is used to push the tab plate 1.
However, the present invention is not limited to this, and other known means such as an electric cylinder or an electric screw method may be used. Further, it is needless to say that the present invention is not limited to the above-described embodiments, but includes various modifications without departing from the gist of the configuration of the present invention.

[0019]

As described above, according to the present invention,
Since the pressing roller or pressing head is attached to the tip of the pressing fluid pressure cylinder used in the device for positioning the tab plate to the steel pipe end, even if the tab plate is not an exact square, the front end face of the tab plate The steel pipe can be surely brought into close contact with the end face of the steel pipe, which can prevent defective welding and non-welding. Also, by combining with other means, automation of tab plate mounting work,
It contributes to unmanned operation.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a configuration of an embodiment of the present invention.

2 (a) and 2 (b) are explanatory views of the operation of the embodiment of FIG.

FIG. 3 is a side sectional view showing the configuration of another embodiment of the present invention.

4 (a) and 4 (b) are explanatory views of the operation of the embodiment of FIG.

FIG. 5 is a side view showing a conventional example of a tab plate positioning device in a partial cross section.

FIG. 6 is a plan view showing the shape of a tab plate.

7 (a) to 7 (c) are explanatory views of the operation of the conventional example.

[Explanation of symbols]

 1 tab plate 1a front end face 1b rear end face 2 steel pipe (welded steel pipe) 2a pipe end face 2b groove 2c outer surface 3 tab plate support plate 4 lifting fluid pressure cylinder (lifting means) 5 pressing fluid pressure cylinder (pressing means) 5a Piston rod 6 Support member 7 Pressing roll 8 Pressing head 9 Box 10 Elastic bag

Claims (2)

[Claims] 1. A device for positioning a tab plate to be welded to a pipe end surface of a steel pipe to be welded, the tab plate supporting plate having the tab plate mounted thereon, and the tab plate supporting plate being an inner surface or an outer surface of the pipe end. In the tab plate positioning device, the tab plate positioning device is provided with a lifting means for pushing the tab plate supporting plate up to contact with the tab plate support plate, and a pressing means for pressing the front end surface of the tab plate on the tab plate support plate in the axial direction of the tube so as to contact the tube end surface. A tab plate positioning device, characterized in that a pressing roll having a vertical rotation axis capable of rollingly contacting the rear end face of the tab plate is attached. 2. Instead of the pressing roll, the pressing means has a box body whose surface facing the tube end surface is open, and a front part of the box body housed in the box body protruding from the box body. 2. The tab plate positioning device according to claim 1, further comprising a pressing head formed of a deformable elastic bag body in which a fluid is sealed.