JP4486268B2 - X-type welding gun device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an X-type welding gun apparatus, and more specifically, includes a set of gun arms that are pivotally supported by a support shaft provided on a gun bracket, and a piston rod of a pressurizing cylinder attached to one gun arm is connected to the other. The present invention relates to an X-type welding gun apparatus which is connected to a gun arm and opens and closes the one set of gun arms by the pressurizing cylinder.
[0002]
[Prior art]
Conventionally, as this type of X-type welding gun device, a set of gun arms is connected via a link having a joint in the middle, and a guide groove is engaged with one of the link and the gun bracket, and the other is engaged with the guide groove. There has been proposed a structure in which an engaging member is provided, and a guide mechanism for setting a displacement locus of a link with respect to the gun bracket is provided by the guide groove and the engaging member.
[0003]
[Problems to be solved by the invention]
However, in this type of X-type welding gun apparatus, according to the structure of the guide mechanism, the guide groove or the center of the gun arm due to the unbalance of the weight between the tip end portion and the tail end portion of the gun arm when the gun arm is opened and closed. It is recalled that the engagement element is worn and a gap of a predetermined distance or more is generated between the guide groove and the engagement element. For this reason, there has been a concern that the displacement trajectory of the link with respect to the gun blanket changes and the welding work position deviates from the initial target position.
[0004]
The present invention has been made in view of the above points, and by maintaining the desired welding operation position while keeping the displacement trajectory of the gun arm constant, it is possible to improve the welding accuracy and improve the welding quality for the workpiece. An object is to provide an X-type welding gun device.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned object, the present invention includes a pair of gun arms that are pivotally supported by a support shaft provided on a gun bracket, and connects a piston rod of a pressurizing cylinder attached to one gun arm to the other gun arm. An X-type welding gun apparatus configured to open and close the one set of gun arms by the pressurizing cylinder, the guide member being spaced apart from the support shaft by a predetermined distance and substantially parallel to the support shaft; A link member that pivotally supports the guide member; and a bearing member that is fitted to the guide member and supports the one gun arm. The bearing member includes an elastic member that generates an elastic force in a rotation direction of the link member. In addition, when an external force is applied to the bearing member by the link member, an elastic force is applied to the guide member by the elastic member.
[0006]
According to the present invention, a floating function that corrects a displacement in the pressurizing direction with respect to the workpiece by absorbing vibration and impact during the opening and closing operation of the gun arm is achieved. Therefore, it becomes possible to perform a welding operation by installing the workpiece at a desired position, and the welding accuracy for the workpiece can be improved.
[0007]
In this case, it is preferable that the link member is provided so as to be displaceable in the circumferential direction around the guide member because an external force acting on the elastic body of the bearing member is adjusted.
[0008]
Further, the bearing member includes an inner case having an inner surface with a substantially square shape in cross section, an outer case with a substantially square shape in cross section disposed on the outer surface side of the inner case, and an outer peripheral surface having the inner case outer surface and the outer case. Since it has the elastic body arrange | positioned at each corner part of a case inner surface, it can absorb the vibration and noise of a X-type welding gun apparatus, and is suitable.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of the X-type welding gun apparatus according to the present invention will be described below in detail with reference to the accompanying drawings.
[0010]
1 to 6 show a configuration of an X-type welding gun apparatus 10 according to an embodiment of the present invention. The X-type welding gun apparatus 10 basically includes a gun bracket 14 fixed to the wrist 12 which is an operation end of the robot, and a bearing 16 (see FIG. 4) provided at the tip of the gun bracket 14. It consists of a set of gun arms 20 and 22 that are pivotally supported on a common spindle 18.
[0011]
Each of the gun arms 20 and 22 includes arm bodies 24 and 26 having electrode tips 20a and 22a attached to the tips thereof, and screw members 32 via tail insulating material (not shown) at the tail ends of the arm bodies 24 and 26. The gun holders 20 and 22 are supported by the support shaft 18 in the arm holders 28 and 30, respectively (see FIG. 4). In this case, in the arm holder 28, as shown in FIG. 4, a boss portion 38 and a shaft portion 40 formed on the support shaft 18 are fitted in the holes 34 and 36, respectively. In the boss portion 38, as shown in FIG. 5, a parallel surface 42 whose outer peripheral surface is formed substantially parallel is fitted to a parallel inner surface 44 formed on the arm holder 28. Accordingly, the arm holder 28 is pivotally supported by the bearing 16 integrally with the support shaft 18.
[0012]
On the other hand, the arm holder 30 is adjacent to both side portions of the arm holder 28 and is pivotally supported by the support shaft 18 via a bearing 46.
[0013]
The cylinder bracket 50 attached to the arm holder 30 with the screw member 48 supports a pressurizing cylinder 52 in a swingable manner via a bearing member 54 and is screwed to the piston rod 56 of the pressurizing cylinder 52. The joint 58 is pivotally attached to the arm main body 24 of the gun arm 20 via a pin 60, and the gun arms 20 and 22 are openable and closable under the driving action of the pressurizing cylinder 52.
[0014]
As shown in FIG. 4, the gun bracket 14 includes a pair of plate-like side plate portions 14 a and 14 b orthogonal to the axial direction of the support shaft 18 so as to sandwich the arm holder 30 of the gun arm 22. Bearing pins (guide members) 62 and 64 that are spaced apart from the support shaft 18 by a predetermined distance to the portions 14a and 14b and are substantially parallel to the support shaft 18 are attached to the bearing links (link members) 68a and 68b via the bearing bush 66. It is worn. The bearing pins 62 and 64 are arranged on the outer side of the inner case 74 as shown in FIG. 3 and a metal inner case 74 mounted on shafts 70 and 72 whose inner surfaces are substantially square-shaped in cross section. A metal outer case 78 mounted in a hole 76 having a substantially regular square cross section formed in the arm holder 30, and an outer peripheral surface defined by each outer surface of the inner case 74 and an inner surface of the outer case 78. The bearing member 82 comprised from the elastic bodies 80, such as rubber | gum of the cross-sectional substantially circular shape arrange | positioned by each formed corner, is mounted | worn. The bearing pins 62 and 64 support the arm holder 30 in a swingable manner with the rotation of the bearing member 82, and are holes formed in the end face portions of the boss portions 84 and 86 on one side. The pins 92 and 88 are integrally formed by pins 92 fitted thereto. In this case, the bearing member 82 is an elastic body that rotates in cooperation with the bearing pins 62 and 64 and the inner cases 74 and 74 constituting the bearing member 82 with respect to the tilting operation of the gun arm 22 with the support shaft 18 as a fulcrum. 80 has a function of elastically regulating by being pressed against the outer case 78.
[0015]
Bearing nuts 94 and 96 are screwed to the other end portions of the bearing pins 62 and 64, and are attached to the bearing bush 66 attached to the bearing links 68a and 68b.
[0016]
In addition, the pin 100 is engaged with the oval groove 98 formed along the longitudinal direction of the bearing links 68a and 68b. The pin 100 is attached to the side plate portions 14a and 14b of the gun bracket 14 by a nut 102 (see FIG. 4).
[0017]
In this case, the bearing links 68 a and 68 b have a function of pressing the bearing member 82 having the elastic body 80 attached to the bearing pins 62 and 64 in the radial direction and applying a load to the elastic body 80.
[0018]
Reference numerals 104 and 106 denote screw members screwed to the side plate portions 14a and 14b of the gun bracket 14, and the screw members 104 and 106 extend in a direction substantially perpendicular to the longitudinal axis of the bearing links 68a and 68b. It is provided and the front-end | tip part of this screw member 104,106 is joined to the outer peripheral surface of bearing link 68a, 68b. Therefore, the bearing pins 62 and 64 are tangential to the circle whose radius is the bearing pins 62 and 64 and the support shaft 18 with the support shaft 18 supporting the arm holder 30 as the center of rotation by increasing or decreasing the screwing amount of the screw members 104 and 106. The elastic member 80 of the bearing member 82 is slightly displaced and presses the elastic body 80, so that vibrations, impacts, etc. acting on the gun arm 22 around the support shaft 18 are absorbed. In this case, in the bearing links 68a and 68b, the pin 100 is guided along the groove 98 and is displaced perpendicularly to the axial direction of the screw members 104 and 106.
[0019]
The nuts 108 and 110 screwed to the screw members 104 and 106 and fixed to the side plate portions 14a and 14b of the gun bracket 14 have a function of preventing rotation of the screw members 104 and 106 (see FIG. 1).
[0020]
A damper 116 is engaged with the bracket 112 attached to the side plate portion 14 b of the gun bracket 14 by a pin 114, and the rod 118 of the damper 116 is engaged with the rectangular column portion 120 a of the mounting plate 120 via the pin 122. Are combined. In this case, the damper 116 has a function of absorbing acceleration energy during the equalizer.
[0021]
The mounting plate 120 is attached to the cylinder bracket 50 by a screw member 48. Here, reference numeral 124 indicates a cover, and this cover 124 is attached to the side plates 14a and 14b in order to protect the bearing 16 by dust and prevent danger caused by the rotation of the support shaft 18.
[0022]
The X-type welding gun apparatus 10 according to the embodiment of the present invention is basically configured as described above. Next, the operation and effect thereof will be described.
[0023]
When welding the workpiece W, first, the X-type welding gun apparatus 10 is moved by a robot (not shown) so that the electrode tip 22a of the gun arm 22 touches the workpiece W lightly, and then the driving action of the pressurizing cylinder 52 is performed. The gun arm 20 is closed about the support shaft 18 through the piston rod 56 below, and the electrode tip 20a of the gun arm 20 is brought into contact with the workpiece W. Eventually, the workpiece W is clamped by the electrode tips 20a and 22a of the pair of gun arms 20 and 22, and the workpiece W is welded by power feeding from a power feeding device (not shown).
[0024]
In this case, since the arm holder 30 is pivotally supported by the bearing member 82 having the elastic body 80 sandwiched between the inner pins 74 and the outer case 78 by the bearing pins 62 and 64, the shock when the gun arms 20 and 22 are opened and closed. Vibration is absorbed by the deformation of the elastic body 80. Further, the gun arms 20 and 22 can be tilted about the support shaft 18 by the amount of deformation of the elastic body 80 of the bearing member 82 in the closed state, and the floating function for correcting the displacement in the pressurizing direction with respect to the workpiece W. Is achieved.
[0025]
For this reason, it becomes possible to perform the welding work by accurately installing the workpiece W at a target position, and the welding accuracy with respect to the workpiece W is improved.
[0026]
【The invention's effect】
As described above, according to the present invention, the floating function for correcting the displacement in the pressing direction with respect to the workpiece is achieved. For this reason, it is possible to perform a welding operation while maintaining and maintaining the workpiece at a desired position, it is possible to improve the welding accuracy with respect to the workpiece, and no additional work or correction work after welding is required. The effect is obtained.
[Brief description of the drawings]
FIG. 1 is a front view showing a schematic configuration of an X-type welding gun apparatus according to an embodiment of the present invention.
2 is a perspective view of an essential part of the X-type welding gun apparatus shown in FIG.
3 is an exploded perspective view of a main part of the X-type welding gun apparatus shown in FIG.
4 is a cross-sectional view taken along line IV-IV in FIG.
5 is a cross-sectional view taken along line VV in FIG.
6 is an enlarged view of a main part of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... X-type welding gun apparatus 12 ... Wrist 14 ... Gun bracket 18 ... Support shaft 20, 22 ... Gun arm 52 ... Cylinder 68a, 68b for pressurization ... Bearing link 82 ... Bearing member 116 ... Damper

Claims (3)

A set of gun arms that are pivotally supported by a support shaft provided on the gun bracket, a piston rod of a pressurizing cylinder attached to one gunarm is connected to the other gunarm, and the set of gunarms is connected by the pressurizing cylinder. X-type welding gun device that opens and closes
A guide member spaced apart from the support shaft by a predetermined distance and provided substantially parallel to the support shaft;
A link member that pivotally supports the guide member;
A bearing member fitted to the guide member and supporting the one gun arm;
The bearing member includes an elastic member that generates an elastic force in a rotation direction of the link member, and when the external force is applied to the bearing member by the link member, the elastic member applies an elastic force to the guide member. An X-type welding gun device characterized by being provided. The X-type welding gun apparatus according to claim 1,
The X-type welding gun apparatus, wherein the link member is provided so as to be displaceable in a circumferential direction around the guide member. The X-type welding gun apparatus according to claim 1,
The bearing member includes an inner case whose inner surface is substantially square-shaped in cross-section, an outer case whose cross-section is approximately square-shaped disposed on the outer surface side of the inner case, and whose outer peripheral surfaces are the inner case outer surface and the outer case inner surface. An X-type welding gun apparatus having an elastic body disposed at each corner of the X-type welding gun.

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