JPH0730217Y2 - Electrode rotation prevention device for equalizing gun - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode detent device for a C type spot welding gun. More specifically, the guide rod of the equalizing device of the robot gun is also used as the electrode rotation stopper on the piston rod side.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional general C type robot gun. FIG. 4 is a right side view. In this case, in the C type gun, a pressure cylinder 2 is connected to one end of a gun arm 1, a point holder 4 attached to the tip of a piston rod 3 of the pressure cylinder, and a pair at the other end of the gun arm. The forming electrode parts 5 and 5 are attached. The entire gun is supported by an equalizer 8 between support plates 7, 7 provided on both wings of a gun mounting bracket 6 mounted on the robot side. In the equalizing device 8, two guide rods 9 fixed to the gun mounting bracket side are inserted into the bushes 13 of the housing 10 provided on both sides of the gun body, and the entire gun can slide with respect to the gun mounting bracket 6. Supported by. The equalizing cylinder 11 fixed to the gun mounting bracket 6 always operates the air pressure in a direction to cancel the weight of the entire gun to balance the weight, and also performs the pressurizing / releasing operation of the electrode parts 5 and 5 on the gun arm side. It is a thing. In the electrode detent device for preventing the rotation of the electrode portion on the piston rod side, the detent rod 12 is fixed to the point holder 4 fixed to the piston rod 3 of the pressure cylinder, and this is fixed to the gun cylinder. It is inserted into the bush 14 of the housing 10.
The welding transformer T is supported by the gun mounting bracket 6,
One terminal is connected to the gun arm side via a secondary plate 15, and the other terminal is connected to the point holder 4 via a secondary plate 16 and a shunt 17.

[0003]

However, in the conventional one, since the guide rod 9 of the equalizing device 8 and the whirl-stop rod 12 of the point holder 4 are arranged at different positions (parallel to each other), the pressure cylinder 2 When the point holder 4 moves forward due to the stroke,
Often interferes with jigs and works. In such a case, there is a problem in that it cannot be easily handled on-site, and the detent device or the jig side must be newly remade.

The problem to be solved by the present invention is that the conventional electrode detent device could not easily cope with the trouble on site when the detent rod interfered with the jig or the work. .

[0005]

The present invention takes the following specific technical means in order to solve the above problems. That is, a C-type gun having a pressurizing cylinder connected to one end of the gun arm and having a pair of electrode portions at the tip of the piston rod of the pressurizing cylinder and the other end of the arm, and the C-type gun. An equalizer is interposed between the gun mounting bracket that supports the gun and the gun so that the entire gun is supported so as to be movable, and a guide hole is provided inside the guide rod of the equalizer, which is concentric with the guide hole. The detent rod fixed to the point holder of the piston rod was inserted above.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view of the essential part of an embodiment of the device of the present invention. 2 is a right side view. In the figure, the same reference numerals are used for the same structural parts as the conventional product. In this case, in the C type gun, the pressure cylinder 2 is connected to one end of the gun arm 1, the point holder 4 attached to the tip of the piston rod 3 of the pressure cylinder 2, and the gun arm.
A pair of electrode portions 5 is attached to the other end of the frame. The entire gun is supported via an equalizer 8 between a gun mounting bracket 6 mounted on the robot side.

The equalizing cylinder 11 fixed to the gun mounting bracket 6 always operates the air pressure in the direction of canceling the weight of the entire gun to balance the weight, and also performs the pressurizing / releasing operation of the electrode portion on the gun arm side. It is a thing.

In the equalizing device 8, two guide rods 9 fixed to the housing 10 on the pressure cylinder body side by bolts B are inserted into the inner diameter of the bear rig 21 of the guide member 20 fixed to the gun mounting bracket side. The entire gun is slidably supported on the gun mounting bracket 6. The welding transformer T is supported by the gun mounting bracket 6, and one terminal is the secondary plate 1 on the gun arm side.
5 and the other terminal is the secondary plate 1
It is connected to the point holder 4 via 6 and a shunt 17. Up to this point, it is the same as the conventional basic structure.

Therefore, in the present invention, a guide hole 22 is provided inside the two guide rods 9, and a rotation stopping rod 12 described later is fitted into the guide hole 22. That is, in the detent device of the present invention, the elongated detent rod 12 having a predetermined size is the piston rod 3 of the pressurizing cylinder 2.
Fixed to the point holder 4 fixed to the gun mounting bracket 6 and reciprocally moved concentrically with the guide hole 22 formed on the axis of the guide rod 9 inserted into the bearing of the guide member 20 provided on the gun mounting bracket 6. It is inserted so that it can be done. In this embodiment, the guide hole 22
Although it has been penetrated into the inside of the guide rod 9, the guide hole 22 may not necessarily be penetrated depending on the length and stroke range of the detent rod 12.

[0010]

As described above, according to the present invention, the guide rod of the equalizing device of the C type robot gun is provided with the guide hole, and the detent rod fixed to the point holder of the piston rod is provided on the same axis as the guide hole. By inserting, the detent rod can be housed concentrically in the guide rod, the overall size of the robot gun can be reduced, and the jig and work during forward stroke of the pressure cylinder can be reduced. Interference can be avoided. Also,
Since the right and left can be rearranged, even if one of them interferes, it can be easily handled by rearranging it on site. Therefore, the welding position is narrower than the conventional one.
It is possible to avoid work interference and to immediately deal with defects caused by the above interference, to save wasteful time and labor, and to reduce costs, thus significantly improving workability and economic efficiency.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention.

FIG. 2 is a right side view of the present invention.

FIG. 3 is an overall view of a C type gun showing a conventional electrode rotation stopping device.

FIG. 4 is a right side view of a conventional device.

[Explanation of symbols]

 1 Gun Arm 2 Pressurizing Cylinder 3 Piston Rod 4 Point Holder 5 Electrode Section 6 Gun Mounting Bracket 8 Equalizing Device 9 Guide Rod 11 Equalizing Cylinder 12 Whirl-stop Rod 20 Guide Member 21 Bearing 22 Guide Hole

Claims (1)

[Scope of utility model registration request] 1. A C-type gun having a pressure cylinder connected to one end of a gun arm and having a pair of electrode portions at the tip of a piston rod of the pressure cylinder and the other end of the arm, and a C type gun. An equalizer is interposed between the type gun and a gun mounting bracket that supports the type gun to support the entire gun so that the gun can move, and a guide hole is provided in the guide rod of the equalizer to guide the guide. Electrode whirl-stop device for equalizing gun, in which a whirl-stop rod fixed to the piston rod point holder is inserted concentrically with the hole.