JPH0584474U - Equalizing equipment for spot welders - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an eco-rising device for a spot welding machine, which can exhibit a normal eco-raising action even when welding is performed with the welding gun in a horizontal position. [Structure] Welding gun 2 is replaced by eco-rising spring 22
Is configured to elastically urge against the self-weight, and the stopper member 5 that restricts the extension operation of the ecological spring 22 is provided, so that the workpiece 17 is clamped by the welding gun 2 in a vertical direction. At some time, the eco-raising action of the eco-raising spring 22 operates. When the welding gun 2 is clamped in the horizontal direction, the weight of the welding gun 2 does not reach the eco-raising spring 22. By restricting the extension operation of the welding gun 2, the welding gun 2 can be moved by the contact pressure when the movable electrode 14 contacts the work 17, and the center position of the clamp and the center position of the work can be matched.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an eco-raising device for a spot welding machine, and more particularly to an eco-raising device for a spot welding machine that can control the operation of the eco-raising device according to the position of the welding gun.

[0002]

[Prior Art]

 In a spot welder, a movable electrode is driven to move forward by a cylinder with respect to a fixed electrode arranged at a position opposite to the movable electrode, and the welding part of the workpiece is pinched between the fixed electrode and the fixed electrode to energize for welding. Done. When clamping the work piece by the movable electrode and the fixed electrode, the welding gun is used to prevent the work piece from being deformed due to the difference between the center position of the clamp and the center position of the welding part. An equalizing device that supports the movable electrode so that it can move in the forward and backward directions is provided. FIG. 4 shows a conventional configuration of a spot welding gun provided with this eco-raising device. The figure shows a side structure of the welding gun 10 supported by the eco-rising device 11, and shows a state before the work 17 is clamped by the movable electrode 14 and the fixed electrode 13. In FIG. 4, a welding gun 10 has a fixed electrode 13 attached to a tip end of a gun arm 12, and a movable electrode 14 arranged at a position opposite to the fixed electrode 13 is configured to be driven forward and backward by an air cylinder 15. ing. This welding gun 10 is attached to a robot arm 16 via an equalizing device 11. In the eco-raising device 11, a rod 19 is attached to a support frame 18 mounted on a robot arm 16, the welding gun 10 can be moved on the rod 19, and the eco-raising spring 22 is used for welding. The welding gun 10 is biased in the direction opposite to the weight of the gun 10. The position where the weight of the welding gun 10 and the ecorising spring 22 are balanced when the bias in the pressurizing direction by the ecorising cylinder 24 is released. The welding gun 10 is lifted up to. When the work 17 is clamped by the movable electrode 14 and the fixed electrode 13 for welding, the welding gun is applied by the contact pressure applied to the work 17 by the difference between the clamp center position and the center position of the work 17. Move 10 up to match clamp position to weld position. By this operation of the eco-raising device 11, the center position of the clamp of the welding gun 10 and the center position of the work 17 coincide with each other, and welding is performed without deforming the work 17 by applying a large force to the work 17 during clamping.

[0003]

[Problems to be solved by the device]

 However, since the weight of the welding gun 10 and the equalizing spring 22 are balanced in the above-described conventional example, the welding gun 10 is inclined at a certain angle or more to perform welding. When the welding posture is such that the weight of the gun 10 is not applied to the eco-rising spring 22, the weight of the eco-rising spring 22 and the welding gun 10 cannot be balanced, and the eco-raising device 11 does not operate normally. However, there is a problem in that the work 17 is deformed by the excessive force of the ecorising spring 22 acting on it. The present invention was devised in view of the above problems, and provides an eco-rising device for a spot welding machine that can normally exhibit eco-radiating action even when welding is performed with the welding gun in a horizontal position. With the goal.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the means adopted by the present invention is a welding gun equipped with movable electrodes and fixed electrodes arranged at opposite positions, and a cylinder for driving the movable electrode forward and backward with respect to the fixed electrode. In the escalating device of the spot welding machine, which supports the welding gun movably in the advancing and retreating direction and elastically biases the welding gun against its own weight by the escalating spring, the elongating motion of the escalating spring beyond a predetermined length. It is configured as an eco-rising device for a spot welding machine, which is characterized in that a stopper member for regulating the above is provided.

[0005]

[Advantage] According to the present invention, like the conventional device, the welding gun is configured to be elastically urged against the self-weight by the ecorising spring, and the extension operation of the ecorising spring is restricted. Since a stopper member is provided, when the workpiece is clamped vertically by the welding gun in the vertical direction, the stopper member is released to activate the ecological action of the ecological spring and the welding gun is tilted ( In the horizontal state, for example, the biasing force of the eco-izing spring does not work due to the action of the stopper member, and the welding gun can move freely without other biasing force such as the stopper cylinder. ， No force is applied to the work when clamping. That is, when the welding gun is clamped in the vertical direction, the eco-rising spring balances the weight of the welding gun, and when the workpiece is clamped between the movable electrode and the fixed electrode, the center position of the clamp becomes Adjust the position of the welding gun so that it matches the center position of the work, and prevent uneven clamping pressure that deforms the work. On the other hand, when the welding gun is in the horizontal direction, the weight of the welding gun in the clamping direction is not applied to the ecorising spring, and the urging force and the weight of the welding gun cannot be balanced. When the welding gun is regulated by the stopper member, the welding gun can move due to the contact pressure when the movable electrode contacts the work, and the work is not subjected to the escalating sprinkling force.

[0006]

【Example】

 Embodiments embodying the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention. It should be noted that the following embodiments are merely examples embodying the present invention and do not limit the technical scope of the present invention. FIG. 1 shows the structure of an eco-rising device for a spot welding machine according to an embodiment of the present invention. FIG. 1 (a) is a side view of a welding gun supported by the eco-rising device. b) is a front view of the eco-rising device, FIG. 2 is an operation explanatory view for explaining the operation of the stopper member, and FIG. 3 is a side view of the welding gun and the eco-rising device when the posture of the welding gun is horizontal. ) And a front view of the eco-raising device (b). The same elements as those in the conventional example are designated by the same reference numerals, and the description thereof will be omitted. In FIG. 1, an eco-raising device 1 is attached to a robot arm 16, and a welding gun 2 is attached to the eco-raising device 1 while being supported by the eco-raising device 1. The welding gun 2 is moved by a robot to perform spot welding on the welding site of the work 17, and the movable electrode 14 is moved forward and backward in the vertical direction as shown in the figure to clamp it between the fixed electrode 13. In this case, as shown in the conventional example, the operation of the eco-riding device 1 causes the balance of the weight of the eco-rising spring 22 and the welding gun 2 so that the center position of the welded part and the center position of the clamp position coincide with each other. Spot welding is performed without deformation of 17. However, as shown in FIG. 3, when the welding part of the work 17 is in the vertical direction and the clamping direction of the movable electrode 14 and the fixed electrode 13 is the horizontal direction, the ecological spring 22 and the welding gun 2 are The balance with the weight of the work 17 does not work, and the urging force of the eco-izing spring 22 is applied to the work 17 and deforms the work 17. In view of this, in the present embodiment, when the clamping direction of the welding gun 2 is horizontal, the stopper means for restricting the extension operation of the ecological spring 22 beyond a predetermined length prevents deformation of the work 17. . FIG. 2 shows the operation of the stopper means, and FIG. 2 (a) shows the case where the welding gun 2 is in the vertical state. The stopper member 5 arranged in parallel with the ecological spring 22 is the ecological spring. 22 is in a position where it does not lock, and the expanding and contracting operation of the eco-rising spring 22 can be freely performed. When the welding gun 2 is moved to a position where the welding part of the workpiece 17 is in the vertical direction as shown in FIG. 3, the stopper member 5 is operated while being urged in the pressurizing direction by the ecological cylinder 24. . That is, as shown in FIG. 2 (b), the stopper cylinder 6 is operated, and the stopper rod 5 is pressed and rotated by the piston rod 7 of the stopper cylinder 6, and the locking projection 5 a at the tip is provided on the equalizing spring 22. Engaged with the locking ring 8. As a result, the escalating spring 22 is restricted from extending beyond the length locked by the stopper member 5. In this state, the welding gun 2 is moved to the welding position, and the movable electrode 14 and the fixed electrode 13 are separated from each other. Accordingly, if the biasing force of the eco-raising cylinder 24 is released before the work 17 is clamped, the welding gun 2 is allowed to move freely, and the fixed electrode 13 moves to a position where it abuts on the work 17 and stops. After that, the movable electrode 14 moves forward by the operation of the cylinder 15 and clamps the welded part of the work 17 with the fixed electrode 13. Since the stopper member 5 can be operated depending on the position of the welding gun 2 as described above, when the position of the welding gun 2 is such that the weight of the ecological spring 22 and the welding gun 2 are not balanced. Also, the eco-rising device 1 according to the present embodiment operates normally, and spot welding can be performed without deforming the work 17.

[0007]

[Effect of the device]

 As described above, according to the present invention, the welding gun is configured to be elastically biased against its own weight by the ecorising spring, and the stopper member for restricting the extension operation of the ecorising spring is provided. Therefore, when the workpiece is clamped by the welding gun in the vertical direction, the ecological action of the ecological spring is activated, and the welding gun is clamped in the horizontal direction. When the balance with the spring cannot be achieved, the stopper means can be actuated to regulate the movement of the ecological spring, and the welding gun can move freely due to the contact pressure when the movable electrode contacts the workpiece. The center position of the clamp and the center position of the work can be matched. Therefore, the eco-rising device of the spot welding machine according to the present invention exerts the effect that the eco-rising effect is exerted regardless of the change of the posture of the welding gun, the work is deformed, and the weeping spot welding is performed.

[Brief description of drawings]

FIG. 1 is a side view (a) and a front view (b) showing a structure of an eco-rising device for a spot welding machine according to an embodiment of the present invention.

FIG. 2 is an operation configuration diagram for explaining the operation of the stopper means according to the embodiment and showing the opening time (a) and the restriction time (b) of the eco-izing spring.

FIG. 3 is a side view (a) and a front view (b) showing a state of the eco-rising device when the welding gun according to the embodiment has a horizontal posture.

FIG. 4 is a side view (a) and a front view (b) showing a configuration of an eco-rising device of a conventional spot welding machine.

FIG. 5 is a side view (a) and a front view (b) showing a state in which a welding gun of a conventional spot welding machine is horizontal.

[Explanation of symbols]

 1--Ecorising device 2--Welding gun 5--Stopper member 6--Stopper cylinder 13--Fixed electrode 14--Movable electrode 15--Cylinder 17--Workpiece 22--Ecorising spring

Claims (1)

[Scope of utility model registration request] 1. A welding gun having a movable electrode and a fixed electrode arranged at opposing positions, and a cylinder for driving the movable electrode to move forward and backward with respect to the fixed electrode is supported movably in the forward and backward directions of the movable electrode. In an eco-rising device of a spot welding machine, which elastically urges the welding gun against its own weight by an eco-raising spring, a stopper member for restricting an extension operation of a predetermined length or more of the eco-raising spring is provided. Equalizing device for spot welding machines.