JPH0749160B2 - Positioner for welding steel members - Google Patents

Description

TECHNICAL FIELD The present invention relates to a welding positioner used for welding a building steel member.

[Conventional technology]

When welding a column / beam joint of a building steel member or a built-up H material, an operation of reversing the member being welded to take an appropriate welding posture occurs.

Various positioners have been developed to automate this and improve the efficiency of positioning. For example, as shown in FIG. 14, a welding positioner for a steel frame joint is a piece that grips one end of the joint (the member 1 to be welded) and moves up and down, swings, and rotates (swirls) as shown by arrows. Handheld type is common. (Welding operation May 1986 issue, JP-A-58-215295) The problems of the conventionally developed positioner are shown in Figs.
It will be described below with reference to the drawings.

As shown in FIG. 10, since the member to be welded 1 is attached to the chuck table 2, the welded portion of the member to be welded 1 interferes with the chuck table 2 of the positioner, and a portion where welding work cannot be performed occurs.

It takes a lot of time to chuck the member to be welded, and there is a doubt about its reliability. This is bolt 3 as shown in Fig. 11.
Depending on the method, the flange plate of the member to be welded 1 is fastened to the chuck table with a metal fitting, so that the member to be welded needs to be accurately placed at a predetermined position and tightly bolted.

As shown in FIG. 12, while the workpiece 1 is being chucked on the chuck table 2, the crane 4 can be used for a long time.
Is restrained.

Positioners have multiple degrees of freedom, leading to complexity and cost.

As shown in FIG. 13, when the member 1 to be welded is inverted to the position 1a, the position of the member to be welded changes greatly, and the portion 1b of the member to be welded to be welded is moved from the operating area 6 of the robot 5 or the like. There are things that come off.

Most of the positioner for the joint portion is suitable for welding the member whose welded member 1 is the joint portion as shown in FIG.
The member to be welded 1 as shown in the figure cannot be used for reversing the web when manufacturing the built-up H material.

In the cantilever type positioner as shown in FIG. 14, as the steel frame joint (member to be welded 1) becomes larger, the member to be welded 1
Deflection of the steel becomes large, and particularly the positioning accuracy of the tip of the steel-frame joint portion deteriorates. Therefore, there is a problem that the automatic welding system such as a robot is hindered.

[Problems to be solved by the invention]

The present invention is intended to solve the problems (1) to (3) and achieve the following objects.

(A) The welder must not interfere with the positioner.

(B) The member to be welded can be reliably supported and inverted by a simple chucking method.

(C) Minimize the constraint time of the crane by making the chuck part a separate unit and mounting it on the member to be welded in advance.

(D) A simple mechanism that allows only one axis rotation to take a downward and horizontal welding posture.

(E) To reduce the position movement of the member to be welded due to reversal.

(F) It can be used not only for the joint part but also for welding the built-up H material.

(G) Use of a positioner that supports both ends to reduce deflection and improve positioning accuracy.

[Means for solving problems]

FIG. 1 shows the technical means of the present invention for achieving the above object.
It will be described below with reference to FIG.

One end of each of the steel members to be welded in the longitudinal direction is removably fixed with bolts and nuts, and the other end is a support pin forming a rotating shaft protruding in the longitudinal direction of the steel member, and the support pins are rotatably supported. The two support columns with adjustable distances between the support fulcrums, the support column on which the two support columns are mounted, and the other support side is vertically movable with one support side as a fulcrum, and the support pin are rotated. It is a positioner for welding a steel frame member, characterized in that it comprises a power means for moving it.

Next, a preferred embodiment of the present invention will be described with reference to FIG. 2. One end portion of the support pin is formed into a truncated pyramid prism, and a shaft coupling that is externally fitted to the prism and is axially shiftable is provided. The positioner for welding a steel frame member according to claim 1, further comprising means for attaching the shaft joint to the power shaft end and pressing the shaft joint in the direction of the prism.

[Action]

Since the positioner of the present invention is configured as described above, the member to be welded can be supported and rotated at both ends thereof, and the welding of the steel column / beam joint and the built-up H-shaped member can be performed horizontally and downwardly. This is carried out in a facing posture, and a uniaxial rotary motion is applied to the welded member with the joint of the joint with the girder or both ends of the web of the built-up H-shaped member as fulcrums, with the web penetrating direction as the axis of rotation. 15 and 16 show the member to be welded 1
By the positioner of the present invention, support points at both ends (bearing 21)
FIG. 12 is an explanatory view showing that the shaft is supported by and rotates about an axis 22 as shown by an arrow 23. By this rotational movement, all the welded portions of the joint portion and the built-up H-shaped member can be welded in a horizontal or downward position only by simple rotation,
Moreover, the position of the member to be welded does not significantly change due to the reversal.

When chucking the positioner, see Fig. 1 (c).
As shown in, the chucking unit 10 that uses bolt holes for high tension bolt field joints that are commonly present at the large beam joints of column / beam joints or at the web ends of built-up H-shaped members is preliminarily used with bolts 14. Attach it to the member to be welded. And the support pin 12 protruding from the same part,
The member to be welded is supported on both ends by mounting it on a column 20 having a bearing 21 provided on the upper portion thereof, and the member to be welded is provided with uniaxial rotational freedom.

The chucking unit 10 does not interfere with the welded portion. Moreover, since the lightweight and small unit is bolted in a splice form, chucking is simple and reliable.

On the other hand, when the member to be welded is mounted on the positioner, the support pin is simply dropped into the bearing 21 at the upper end of the column, so that the restraining time of the overhead crane and the positioner operation stop time for chucking can be very short. Since the bolt holes are common to the column / beam joints and built-up H-shaped members, this case is applicable to both.

The column 20 on the driven side is moved and the distance between fulcrums is adjusted according to the dimensions of the member 1 to be welded. Therefore, the size and length of the member to be welded can be accommodated.

The rotational movement is performed by connecting a driving force of an electric motor or the like provided on the support column 20 to a meshing portion 13 of the support pin of the chucking unit 10 with a shaft coupling 32 to transmit power.

Further, as shown in FIG. 2, the bed 40 can be tilted by the cylinder 42 about the pin 41. In such a both-end supporting type positioner, as shown in FIG. 3, due to variations in the assembly accuracy of the member to be welded 1 and the mounting accuracy of the chucking unit 12, the chucking unit 2 as shown in FIG. The shaft center may be out of alignment, and normal shaft couplings may not be able to handle it. In order to solve this problem, the tip of the pin 12 of the chucking unit 10 is a tapered prism 14 (see FIGS. 2 (b) and 2 (c)), and a sleeve-shaped shaft having a large-diameter square hole. Coupling
33 is constantly pressed against the prism 14 side by a cylinder 34 or the like (see FIG. 2 (b)). The shaft coupling 33 can follow the runout. When the center of gravity of the welding member exceeds the vertical line of the center of rotation (5th
Although there is a problem that the member to be welded falls only in the gap between the coupling 33 and the prism 14 (Fig. 5), means for pressing the sleeve-shaped shaft coupling 33 when the motor is oscillated in the forward and reverse directions (cylinder). 34, etc.) can be connected without any gap. Then start normal operation.

〔Example〕

The apparatus of the present invention can be applied to the beam connection part (7
The example applied to the welding work shown in FIG. 14 will be described in comparison with the conventional positioner shown in FIG. 7 to 9 show the welded member 1
It is a perspective view of the finish drawing of FIG.

(1) Mounting the member to the positioner Conventionally, after transporting the member to be welded to the positioner mounting position,
It took about 20 minutes for two workers to fix it to the positioner, and this work could not be done while the positioner was operating.

In the embodiment, the chucking unit can be attached to the member to be welded separately from the operation of the positioner, and one worker completes the attachment of the chucking unit in about 3 minutes. In addition, the member with the positioner
Can be easily placed on top. The two columns 20 can freely adjust the distance between the columns.

(2) Interference between the member mounting part and the welded part In the conventional device, the chuck table was mounted as shown in FIGS. 10 and 11, so welding of the abutting part of one flange and the other flange was not possible. Therefore, although it was necessary to replace the member to be welded with the chuck table, in the embodiment, since there is no such obstacle (interference), all the welding processes can be performed with one mounting.

(3) Degree of freedom of positioner Since the conventional positioner has two or more degrees of freedom such as rotation around the shaft and tilting of the shaft, the structure is complicated and the equipment cost is high. Since there is only one axis of freedom for movement, the structure is simple and inexpensive. Rotational position control of the device of the present invention is performed using a potentiometer or encoder (not shown). The tilting position control is performed by operating a cylinder 42 having a servo mechanism as shown in FIG. With the expansion and contraction of the cylinder 42, the base 40 tilts around the pin 41 on one end side as the multiple ends move up and down, and the member to be welded 1
Tilts.

(4) Target member to be welded Conventionally, the column and beam joints were exclusively used, but in the example, built-up H steel can be welded.

(5) As a result of the above, the welding time ratio (arc time rate) in all the processes was about 20% in the past
It improved to 40%, which greatly contributed to improvement of construction efficiency, productivity and cost reduction.

FIG. 17 is an overall perspective view of an automatic steel-frame joint welding system equipped with a positioner according to an embodiment of the present invention. The member to be welded 1 has chucking units 10 attached to both ends, supported on columns 20, and rotated by power means 30. The welding robot 5 operates the automatic device 6 according to a command from the computer 7 to weld the member 1 to be welded. Compared with the conventional positioner, this device has improved positioning accuracy of the members to be welded, so that it is not necessary to teach each welding member one by one, and welding work can be performed by robot operation commands from the line computer 7. It was Therefore, a great labor saving effect was obtained.

〔The invention's effect〕

Since the present invention is configured as described above, it has the following excellent effects.

B) With a simple and inexpensive device, the steel structure for construction can be securely gripped and rotated, and welding work can be facilitated.

B) Welding of built-up H-section steel is also possible.

C) While the positioner is in use, the chucking unit for other members can be attached separately, and the time for restraining the crane is short.

D) It contributes to improvement of construction efficiency and cost reduction.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, (a) is a front view,
(B) is a side view, (c) is an enlarged detailed perspective view of part A, FIG. 2 shows another embodiment, (a) is a front view, and (b) is its B.
Part enlarged view, (c) is a view taken along the line CC of FIG. (B), FIG. 3 is a front view of a member to be welded with poor assembly accuracy, FIG. 4 is an enlarged explanatory view of its end, and FIG. Is an explanatory view when the center line of the member to be welded and the center line of the support pin of the chucking unit are inconsistent, and FIG. 6 is an explanatory view showing the relationship between the coupling and the prism in the case of FIG. 5, FIG. 8, FIG. 8 and FIG. 9 are perspective views exemplifying a member to be welded, FIG. 10 to FIG. 14 are explanatory views of the prior art, and FIG. 15 and FIG. 16 are explanations of the operating principle of the positioner of the present invention. FIG. 17 is an overall perspective view of an automatic steel-frame joint welding system equipped with the device of the present invention. 1 …… Welding member 2 …… Chuck table 3 …… Bolt 4 …… Crane 5 …… Robot 6 …… Robot operating range 7 …… Computer 8 …… Automatic controller 10 …… Chucking unit 11 …… Stuck part 12 …… Support pin 13 …… Mating part 14 …… Square pillar 15 …… Bolt 20 …… Post 21 …… Bearing 22 …… Center shaft 23 …… Rotating direction arrow 30 …… Power means 32, 33 …… Shaft coupling 34 …… Cylinder (pressing means) 40 …… Base 41 …… Support point 42 …… Cylinder

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomoya Fujimoto 2-3 2-3 Uchisaiwaicho, Chiyoda-ku, Tokyo Kawasaki Steel Corporation Tokyo headquarters (72) Inventor Noriho Hosho 18 Showa-cho, Marugame City, Kagawa Prefecture Shikoku Iron Works Co., Ltd. (56) References

Claims (2)

[Claims] 1. A support pin, which is detachably fixed to both ends of a steel member to be welded in the longitudinal direction by bolts and nuts, and has the other end forming a rotating shaft projecting in the longitudinal direction of the steel member, and the support pin, respectively. Two struts which are rotatably supported and whose distance between supporting fulcrums can be adjusted; and a stanchion mount on which the two stanchions are mounted and one stanchion side is a fulcrum and the other stanchion side is vertically movable. A positioner for welding a steel frame member, comprising a power means for rotating the support pin. 2. One end of the support pin is formed as a truncated pyramid prism, and a shaft coupling externally fitted to the prism and shiftable in the axial direction is attached to a power shaft end, the shaft coupling being the prism. The positioner for welding a steel frame member according to claim 1, further comprising means for pressing in a direction.