JP3585345B2 - Welding gun support device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a welding gun support device that supports a welding gun movably in any three-dimensional direction with a light force.
[0002]
[Prior art]
In the work of manually performing welding by using a welding gun, a gun pole type welding gun support device 80 in FIG. 4A and an LM guide type welding gun support device 82 in FIG. 4B are used. In the gun pole type, a welding gun G is suspended and supported at the lower end of a wire 86 hanging from a horizontal member 84a of a gun pole 84, which is an L-shaped column. A predetermined portion of a work W such as an automobile panel fixed on the top is welded. In FIG. 4A, reference numeral 89 denotes a transformer. In the LM guide type, two sets of LM guides 90 and 92 are vertically overlapped with their guide directions orthogonal to each other, and a welding gun G is provided at a tip end of an arm 94 fixed on the upper LM guide 90. It is.
[0003]
[Problems to be solved by the invention]
In the gun pole type apparatus 80, the worker M often pulls the welding gun G obliquely downward toward the welding portion of the work W, and therefore, it is necessary to bend the waist and strike the welding in a leaning working posture. The work is difficult and the efficiency is poor. Further, since the hitting direction of the welding portion differs depending on the work W, the hanging support structure of the welding gun G is changed every time the type of the work W is changed in order to easily tilt the welding gun G in correspondence with the change of the hitting direction. Need to adjust.
[0004]
The LM guide type device has an advantage that the welding gun G can be moved in the horizontal two-dimensional direction with a light force, but since the welding gun G cannot be moved in the vertical direction, each time the type of the workpiece W changes. There is a problem that the supporting height of the jig 95 of the work W must be changed.
[0005]
An object of the present invention is to provide a welding gun support device capable of moving a welding gun in a natural working posture in any three-dimensional direction with a light force.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, a welding gun support device of the present invention includes a gantry for clamping and supporting a work to be welded, and a free horizontal swing around a first vertical axis disposed in a gantry below the work. A first rotating member, a parallel quadruple link having a base end attached to the first rotating member and a distal end swinging up and down; and a horizontally slidably mounted to a distal end of the parallel quadruple link. A horizontal slide shaft provided, a second rotary member rotatably and horizontally rotatable around a second vertical axis attached to a distal end of the horizontal slide shaft, and a manual welding gun mounted on the second rotary member. And a reaction force means disposed between the first rotating member and the parallel quadruple link to support the weight from the parallel quadruple link to the welding gun.
[0007]
Here, in order to be able to swing-adjust the hitting point direction of the welding gun in the left-right direction, a rotating shaft extending in the lateral direction and freely rotatable is attached to the second rotating member. The welding gun can be attached to the rotating shaft so that the center of gravity of the welding gun is located on an extension of the above.
[0008]
Further, in order to increase the degree of freedom in the direction of the hitting point of the welding gun, a rotating shaft extending in the lateral direction and freely rotatable is attached to the second rotating member, and the tip of the rotating shaft is attached to the second rotating member. The welding gun can be attached to the bracket part by attaching a bracket part having a support axis orthogonal to the rotation axis so that the center of gravity of the welding gun coincides with the support axis of the bracket part.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the welding gun support device 2 of the present invention has a base 6 placed horizontally on a floor 4. Two first vertical shafts 8 are disposed on the upper surface of the base 6 at symmetrical positions, and a horizontal gantry 10 is supported on the upper end of the first vertical shaft 8. A plurality of clamps 12 are arranged on the periphery of the gantry 10, and the periphery of the vehicle panel material 14 is fixed by the clamps 12.
[0010]
The cylindrical portion 16a of the first rotating member 16 is rotatably inserted around the outer periphery of the first vertical shaft 8 via a bearing (not shown). A first bracket portion 16b is integrally fixed to the outer peripheral surface of the cylindrical portion 16a, and a base of four link plates 18a, 18b, which is a total of four upper, lower, left, and right parallel links 18 formed on the upper end of the first bracket portion 16b. The ends are each pinned. The distal ends of the link plates 18a and 18b are pin-connected to a second bracket 22 fixed to the back surface of the distal end plate 20 as shown in FIG. A pneumatic cylinder 24 is provided between the lower end of the second bracket portion 22 and the lower end of the first bracket portion 16b as a reaction force means. The pneumatic cylinder 24 is used to constantly urge the distal end of the parallel quadruple link 18 or the second bracket portion 22 upward to support the weight from the parallel quadruple link 18 to the welding gun G described later. A predetermined air pressure is sealed in the pneumatic cylinder 24. Instead of the pneumatic cylinder 24, an appropriate spring member or the like capable of supporting the weight of the welding gun G may be provided.
[0011]
The end plate 20 extends a predetermined length laterally, and a bearing portion 26 having an axis horizontal is disposed in the extending portion. The bearing 26 is a ball spline bearing and supports a horizontal slide shaft 28 inserted therein so as to be slidable in the horizontal direction. A vertical bearing cylinder 30 is fixed to the tip of the horizontal slide shaft 28, and a second vertical shaft 32 is inserted into the bearing cylinder 30 via a bearing (not shown). A second rotating member 34 is fixed to the upper end of the second vertical shaft 32 so as to be horizontally rotatable. At the upper end of the second rotating member 34, a rotating shaft 36 extending obliquely in the horizontal direction is provided. A C-shaped welding gun G is fixed to the tip of the rotating shaft 36 such that the position of the center of gravity coincides with the extension of the rotating shaft 36. Although not shown, a kickless cable in which positive and negative power lines are twisted is connected to the welding gun G as a power supply cable.
[0012]
The welding gun supporting device 2 is configured as described above, and the welding gun supporting device 2 operates as follows in the welding operation of the panel member 14. First, when the panel member 14 is placed on the gantry 10 and fixed at a predetermined position by the plurality of clamps 12, the operator holds the welding gun G in his hand and moves the welding gun G to a predetermined welding portion of the panel member 14. At this time, the movement of the welding gun G in the horizontal two-dimensional direction is performed by the horizontal turning operation of the first rotating member 16, the sliding operation of the horizontal slide shaft 28, and the horizontal turning operation of the second rotating member 34. The vertical movement of the welding gun G is performed by the vertical swing of the parallel quadruple link 18. Further, the direction and angle of the welding point of the welding gun G is adjusted by rotating the rotating shaft 36. The first rotating member 16, the horizontal slide shaft 28, and the second rotating member 34 rotate and slide almost without resistance by bearings or ball splines, so that the movement of the welding gun G in the horizontal two-dimensional direction is very light. You can do it with power. Further, since the weight from the welding gun G to the parallel quadruple link 18 is balanced and supported by the pneumatic cylinder 24, the welding gun G can be moved up and down with a very light force.
[0013]
In addition, since the center of gravity of the welding gun G is located on an extension of the rotating shaft 36, the welding gun G is still in that state even if it is left at an arbitrary rotating position around the rotating shaft 36, and The welding gun G can be rotated with a light force.
[0014]
As described above, the welding gun G can be moved in a desired three-dimensional direction with a light force, and the welding gun G can be rotated with a light force. Can be welded. Depending on the type of work, the hitting angle may be constant. However, when welding only such a work, the rotating shaft 36 is not particularly necessary, and the welding gun G is connected to the upper end of the second rotating member 34. What is necessary is just to fix to a part at a predetermined angle.
[0015]
Next, a modified example in which the degree of freedom of the welding gun G in the hitting direction is increased will be described with reference to FIG. The welding gun support device 2a has a bracket 38 attached to the tip of a rotating shaft 36, and a welding gun G attached to the bracket 38. The bracket portion 38 has a support shaft 40 orthogonal to the rotation shaft 36, and the welding gun G is swingable in the vertical direction (up and down direction) around the support shaft 40. A balance weight 42 is fixed to the welding gun G, so that the center of gravity of the welding gun G including the balance weight 42 is aligned with the support shaft 40. It is needless to say that the balance weight 42 is not particularly required depending on the position of the support shaft 40.
[0016]
According to the welding gun support device 2a of this modification, not only the welding gun G can swing in the left-right direction but also in the vertical direction, so that the welding gun G can be moved with a slight force in any hitting direction. It can be turned, and it can perform speedy welding work in the right direction of hitting any kind of work.
[0017]
Although the embodiment of the present invention has been described above, the present invention can be variously modified without being limited to the embodiment. For example, in the embodiment, two first vertical axes 8 are used. It is also possible to use only one vertical shaft 8 and move one welding gun G all around the work. Alternatively, two or more first vertical shafts 8 may be provided so that a plurality of workers can simultaneously use a plurality of welding guns G to complete welding of a workpiece in a short time. In the above-described embodiment, the first vertical axis 8 also serves as the column of the gantry 10, but a column dedicated to the gantry 10 may be provided separately from the first vertical axis 8.
[0018]
【The invention's effect】
As described above, in the present invention, the welding gun G can be moved in any three-dimensional direction with a light force, so that the welding operation can be efficiently performed in a comfortable posture. In addition, since the first vertical axis serving as the base of the welding gun support device is disposed below the work, there is no obstacle around the work, and a wide work space can be secured around the entire work. The operator can quickly perform a welding operation by pushing around the welding gun G by hand and moving quickly to an arbitrary welding portion around the work.
[Brief description of the drawings]
FIG. 1 is a side view of a welding gun support device according to an embodiment of the present invention.
FIG. 2 is a plan view of a main part of the welding gun support device.
FIG. 3 is a side view of a main part according to a modification of the welding gun support device.
4 (A) and 4 (B) show a conventional welding gun support device, (A) is a side view of a gun pole type welding gun support device, and (B) is a side view of an LM guide type welding gun support device. .
[Explanation of symbols]
2, 2a Welding gun support device 8 First vertical shaft 10 Mounting stand 12 Clamp 14 Panel material (work)
16 First rotating member 18 Parallel quadruple link 24 Pneumatic cylinder (reaction means)
26 Bearing 28 Horizontal slide shaft 30 Bearing cylinder 32 Second vertical shaft 34 Second rotating member 36 Rotating shaft G Welding gun M Worker

Claims (1)

A gantry for clamping and supporting the work to be welded, a first rotating member arranged in the gantry below the work and capable of freely and horizontally turning around a first vertical axis, and a base end portion of the first rotating member A parallel quadruple link whose tip is swingable in the vertical direction, a horizontal slide shaft slidably attached to the tip of the parallel quadruple link in a horizontal direction, and a tip of the horizontal slide shaft. A second rotating member that can freely rotate horizontally around a second vertical axis attached thereto, a manual welding gun attached to the second rotating member, and a weight from the parallel quadruple link to the welding gun. And a reaction force means disposed between the first rotating member and the parallel quadruple link.

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