JPH0623675U - Electrode rotation prevention device for equalizing gun - Google Patents

Abstract

(57) [Summary] [Purpose] The guide rod of the equalizing device for the C type spot welding gun is also used as the electrode stopper. [Structure] A gun arm and a C-type gun having a pair of electrodes at the tip of a piston rod of a pressure cylinder are movably supported on a gun mounting bracket through an equalizing device, and the guide rod of the equalizing device is provided. A guide hole is provided in the inside of the piston, and the detent rod fixed to the point holder of the piston rod is inserted concentrically with this guide hole. As a result, the overall size of the robot gun can be reduced, the detent rod can be easily rearranged, and interference with a jig or work can be easily avoided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electrode rotation stopping device for a C type spot welding gun. More specifically, the guide rod of the equalizer of the robot gun is also used as a stopper for the electrode around the piston rod.

[0002]

[Prior art]

 FIG. 3 shows a conventional general C type robot gun. FIG. 4 is a right side view. In this case, the C type gun has a pressurizing cylinder 2 connected to one end of a gun arm 1, a point holder 4 attached to the tip of a piston rod 3 of the pressurizing cylinder, and the other end of the gun arm. The electrode parts 5 and 5 forming the 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 equalizer 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 slides on the gun mounting bracket 6. It is supported as much as possible. The equalizing cylinder 11 fixed to the gun mounting bracket 6 always actuates air pressure in a direction to cancel the weight of the entire gun to balance the weight, and pressurizes / releases the electrodes 5 and 5 on the gun arm side. To do. In the electrode detent device that prevents the rotation of the electrode part 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. It is inserted into the bush 14 of the fixed housing 10. The welding transformer T is supported by the gun mounting bracket 6, one terminal is connected to the gun arm side through the secondary plate 15, and the other terminal is connected through the secondary plate 16 and the shunt 17. It is connected to the point holder 4.

[0003]

[Problems to be solved by the device]

 However, in the conventional case, since the guide rod 9 of the equalizer 8 and the rotation stopping rod 12 of the point holder 4 are arranged at different positions (parallel), the pressurizing cylinder 2 strokes and the point holder 4 moves. There is often a problem that the detent rod 12 interferes with a jig or a work when the is moved forward. In such a case, there was a problem in that it could not be easily dealt with on-site, and the detent device or jig side had to be newly remade.

The problem to be solved by the present invention is that the conventional electrode detent device could not easily cope with a defect in the field when the detent rod interfered with a jig or a work. is there.

[0005]

[Means for Solving the Problems]

 The present invention has taken the following specific technical means in order to solve the above problems. That is, a C-type gun having a pressure cylinder connected to one end of the gun arm and having a pair of electrodes at the tip of the piston rod of the pressure cylinder and the other end of the arm, and the C-type gun. An equalizing device is interposed between the gun mounting bracket that supports the gun and the gun so that the entire gun is supported so that it can move, and a guide hole is provided inside the guide rod of the equalizing device. I inserted the non-rotating rod fixed to the point holder of the piston rod.

[0006]

【Example】

 FIG. 1 is a sectional view showing the main part of an embodiment of the device of the present invention. Fig. 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, the C-type gun has a pressurizing cylinder 2 connected to one end of the gun arm 1, a point holder 4 attached to the tip of the piston rod 3 of the pressurizing cylinder 2 and the other end of the gun arm. Is attached to the electrode section 5. 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 constantly operates air pressure in a direction of canceling the weight of the entire gun to balance the weight, and pressurizes / releases the electrode portion on the gun arm side. It is something to do.

In the equalizing device 8, two guide rods 9 fixed to the housing 10 on the pressure cylinder body side with bolts B are inserted into the inner diameter of the vane 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, one terminal is connected to the gun arm side through the secondary plate 15, and the other terminal is connected through the secondary plate 16 and the shunt 17. It is connected to the point holder 4. 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, an elongated detent rod 12 having a predetermined size is fixed to the point holder 4 fixed to the piston rod 3 of the pressure cylinder 2, and the guide is provided on the gun mounting bracket 6. The guide rod 9 inserted into the bearing of the member 20 is inserted so that it can reciprocate concentrically with the guide hole 22 formed on the axis of the guide rod 9. In this embodiment, the guide hole 22 penetrates the inside of the guide rod 9, but the guide hole 22 may not necessarily penetrate depending on the length and stroke range of the detent rod 12.

[0010]

[Effect of device]

 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 inserted on the same axis as the guide hole. , The guide rod can be housed concentrically in the guide rod, the overall size of the robot gun can be reduced, and there is no interference of jigs and work when the pressure cylinder strokes forward. It can be avoided. Also, since the left and right can be rearranged, even if one of them interferes, it can be easily handled by rearranging it on site. Therefore, compared to the conventional method, it is possible to avoid work interference even at a narrower welding position, and it is possible to immediately deal with defects due to the above interference, save unnecessary time and labor, and reduce costs. The workability and economic efficiency can be significantly improved.

[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.