KR950004913Y1 - Welding device of a box type steel structure - Google Patents

Abstract

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Description

Welding device for box steel

1 is a cutaway perspective view showing an example of a box-shaped iron.

2 is a cross-sectional view showing a problem of the conventional automatic welding method.

3 is a perspective view showing the configuration of the present invention welding apparatus.

4 is a partially enlarged side view showing a welding method by the present invention welding apparatus.

5 is a partially enlarged side view showing another welding method by the present invention welding apparatus.

* Explanation of symbols for main parts of the drawings

1: saddle 5: arm

2: post 6: welding head

3 beam 10 static pressure cylinder

4: arm carrier 11: pressure sensing head

The present invention relates to the production of iron balls (鐵 構 物), and more particularly to a welding device suitable for welding a box (iron) box (steel).

The term "steel structure" includes a shell structure or a steel structure structure comprising land or offshore structures. In particular, the box-type iron is an elongated hexahedral panel assembly, which is used as a beam, girder, column, or the like for bridges, large vapors, or offshore structures. Including box-shaped hardware, such a hardware is a large-scale heavy structure with a basic dimension of several m to several tens of meters, so the manufacturing and transportation process is a large-scale work according to the construction work.

FIG. 1 shows a box girder constituting a girder of a bridge as an example of the box-shaped iron articles described above. The box girder has a rectangular cross section consisting of a top plate (T) and a bottom plate (B) and two web plates (W), each reinforced with a stiffner (St, Sb, Sw). It is formed in the form of a box, and each plate (T, B, W) is fixed and diaphragm (D) spaced at a predetermined interval in the longitudinal direction of the box girder to resist shear and torsion of the box girder. This is arranged.

In addition, the stiffeners St and Sb of the upper and lower plates T and B are reinforced by ribs Rt and Rb arranged at predetermined intervals between the diaphragms D, so that local deformation or buckling is performed. (buckling), etc.

Meanwhile, the stiffener Sw of the web plate W is also combined with the rib Rw. In the web plate W, the rib Rw is composed of a main reinforcing material, that is, a continuous material, to increase the vertical shear resistance of the box girder. The stiffener Sw is made of an intermittent material and welded to the rib Rw to form a matrix structure. A manhole (M) is formed in the diaphragm (D) for the worker's entrance and exit. A flange (F) for reinforcement thereof is installed around the manhole (M) together with a bracket (K).

The box girder is combined with other box girder to form a bridge light structure as needed. For this purpose, the end of the box girder is used for fastening bolts or rivets. Coupling holes H are formed.

The above-mentioned box girder is a structure that mainly resists bending, and in the case of a column or beam-column that is mainly subjected to axial pressure among box-shaped steel, the diaphragm is arranged more densely, or a stiffener or the like. Iii) Only the diaphragm, etc., without the direction reinforcement will be arranged.

When the assembly of the box-shaped steel ball is completed, the box-shaped steel ball is completed by welding the joint surface of each reinforcing plate.

Such welding between reinforcing plates can be roughly divided into internal welding and external welding. However, internal welding with each reinforcing material can be performed by manual welding, but external welding with continuous welding lines ranging from several to several tens of meters is possible. It is preferable to carry out by one automatic welding from the viewpoint of productivity.

FIG. 2 (a) shows a seam sensor E of a conventional so-called "seam tracker" used for such automatic welding. This seam sensor (E) is a contact type electronic sensor whose contact hole (0) advances ahead of the welding head along the improvement part of the base plate (P), and has a contact resistance with the portion to be welded or Accordingly, the weld line is traced by detecting the current change and changing the position of the welding head on the XY table according to the detection result. However, since the seam sensor (E) detects the contact resistance of the contact hole (0), the failure is frequently caused by electromagnetic waves, magnetic fields, or conduction heat generated from the welding machine, and the welding line is often separated. Also, in order to measure the proper contact resistance, it is necessary to form an angle of improvement of both base plates P. If the welding cannot be completed in one pass, the contact hole for the next pass It is necessary to replace (0) with a larger diameter.

Due to this limitation, the welding seam tracking range of the conventional seam tracker is only about ± 150 mm, and automatic welding of a structure with a large variation in the welding seam was impossible.

When such a conventional seam tracker is used for the manufacture of a box-shaped iron piece, as described in FIG. 2 (b), the iron piece to which the two base plates P are butt welded to each other, for example, a beam column, is described above. You can use it if you take the trouble. However, in this case, there is a inconvenience in that the box-shaped steel balls having a length ranging from several tens to tens of meters and heavy weights of tens to hundreds of tons are matched with the seam trackers to be within the tracking range of the seam trackers.

In addition, in the case of a box girder in which the flanges of the upper and lower plates T and B protrude toward the web plate W, the web plate W and the upper and lower plates T and B are filled by welding. Since the angle of improvement cannot be conformed, the conventional seam tracker cannot be used.

The present invention provides a welding apparatus of a box-type steel fitting which can trace the welding line irrespective of the welding method or the improvement type, and does not break down or break the welding line due to external interference, and does not need to match the steel fittings in view of the conventional problems. It aims to do it.

In order to achieve this object, the welding apparatus according to the present invention includes two birds traveling in the longitudinal direction of the steel to be welded, a beam extending between the posts installed in the two birds, two arm carriers installed to be movable relative to the beam, and And an arm supported so as to be movable up and down by the arm carrier, and a welding head provided at the tip of the arm to weld the welding line of the steel fitting.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention welding apparatus.

In FIG. 3, traveling rails 14 are provided on both sides of a surface plate or conveyor 13 on which the steel parts to be welded are mounted in parallel thereto, and the welding device of the present invention is mounted on the traveling rails 14. Saddle (1) of will run. On both birds 1 a post 2 extends upwards and a beam 3 is supported between both posts 2.

The beam 3 is supported by two arm carriers 4 so as to be able to move along the beam 3, and each arm carrier 4 is capable of lifting up and down with an arm 5 having a welding head 6. Supported. Reference numeral 7 is a drive motor for driving the movement of the arm carrier 4 with respect to the beam 3, and reference 8 is a lifting motor for lifting the arm 5 with respect to the arm carrier 4. Reference numeral 9 denotes a brake for holding the arm 5 at a predetermined height relative to the arm carrier 4.

The welding head 6 is supported, in particular as shown in FIG. 4, so that it can pivot as needed with respect to the tip of the arm 5, but it can be maintained inside or outside, or at an appropriate angle, as necessary. In addition, the welding head 6 is not in series with the arm 5, but is elastic at a predetermined air pressure by a constant pressure cylinder 10 using, for example, pneumatic pressure, in accordance with the characteristics of the present invention. Is supported. In addition, not only the torch 12 but also a pressure sensing head 11 is attached to the tip of the welding head 6 so that the pressure sensing head 11 is attached to the welding line or the plate surface near the welding line. It makes contact and transmits the vertical component of the contact force to the positive pressure cylinder 10. The positive pressure cylinder 10 is connected to a pressure balance circuit (not shown) to drive the arm carrier 4 according to the pressure change. That is, the pressure balance circuit sends a signal according to the pressure change to a controller (not shown) such as a programmable logic circuit (PLC), and accordingly, the controller returns the pressure in the positive pressure cylinder 10 to a predetermined set value. The driving motor 7 is operated to move 4). In other words, when the pressure transmitted to the positive pressure cylinder 10 through the pressure sensing head 11 is smaller than a predetermined set value, the arm carrier 4 is brought closer to the steel side in consideration of being separated from the welding line. The drive motor 7 is to be rotated forward and backward to move in the direction of separation.

Accordingly, in the process of saddle 1 moving along the running rail 14 and welding the steel fittings, both arm carriers 4 travel between strokes of almost half the length of the beam 3. To be tracked. Accordingly, even if the iron fittings are not matched with the traveling line of the inventive device, the automatic continuous welding is performed only when the iron fittings are positioned below the inventive device.

The welding device of the present invention can also rotate the welding head 6 with respect to the arm 5, and can perform inner welding as needed.

For example, in FIG. 5, the torch 12 of the welding head 6 is in the state in which the steel plate is pressed so that the web plate W faces upward, and the protruding flange of the upper and lower plates T and B faces outward. The process of carrying out the lamination welding between the web plate and the web (W) is shown.

As shown above, according to the present invention, since the welding line is traced by a mechanical method using pressure balancing, there is no limitation on the welding method or the angle of improvement, and smooth automatic welding is possible without the interference of the external electromagnetic wave or the welding line, especially the tracking range. It is very large so that automatic welding can be performed without adjusting the fitting of the steel.

In addition, since the welding of the welding head enables the welding at the outside and inside or at an appropriate angle, the optimum welding method can be selected as necessary, thereby improving the welding quality. In addition, the present invention can be applied to the production of other steel structures such as ships in addition to the welding of the steel can obtain the same effect.

Accordingly, the present invention has a great effect with the improvement of productivity and quality of iron production.

Claims (2)

Two saddles 1 running in the longitudinal direction of the steel piece to be welded, a beam 3 extending between the posts 2 installed in the two saddles 1, and two arms movably mounted to the beam 3 A carrier (4), an arm (5) supported on the arm carriers (4) to be lifted and lowered, and a welding head (6) provided at the tip of the arm (5) to weld the welding wire of the steel fitting. In the box-shaped steel ball welding device, the welding head (6) is supported by the positive pressure cylinder (10) on the arm (5), the tip of the welding head (6) is in contact with the welding line and the contact force of the positive pressure It is provided with a pressure sensing head 11 to transmit to the cylinder 10, by moving the arm carrier (4) relative to the beam (3) in accordance with the change in the contact force transmitted to the positive pressure cylinder (10) Box-type steel ball welding device, characterized in that tracking. 2. A device according to claim 1, characterized in that the welding head (6) is pivotally supported relative to the arm (5).