JPS602955B2 - Welding machine safety equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention primarily relates to a safety device in a robotic automatic welding machine.

Conventionally, in this type of device, a welding torch is attached to the wrist side of the robot in a torch holder at its base via Bakelite or other easily damaged parts, so that if the torch accidentally comes into contact with the base material or other material due to malfunction, There is a known method in which the torch is protected from damage by causing damage to the member, but in such a method, if the member is damaged, the torch must be reinstalled, which is troublesome. do not have.

Furthermore, a device of this kind has been proposed in which a voltage is applied in advance between the torch and the base material, and when the two come into contact, the voltage changes and this is known. ), the voltage is relatively low for work safety reasons, and especially considering the case where there is a workpiece on the main village through the odor control and the torch comes into contact with the workpiece, the voltage is relatively low. and the pick-up device and are attenuated, thus having the disadvantage that the detection of changes therein is relatively difficult. The purpose of this invention is to obtain a device that does not have the above disadvantages.
On the outer periphery of the welding torch extending from the welding machine body, an inner cylindrical conductor contact and an outer cylindrical elastic or flexible conductor contact opposing this with a gap are provided. A contact detector is configured by applying a low voltage between both contacts, and further includes a detector for detecting a change in voltage due to contact between both contacts, so that a signal can be obtained from the detector. . An example of implementing the present invention will be explained with reference to the attached drawings.

In the drawing, reference numeral 1 indicates a torch extending from a torch holder on the wrist of a welding machine, for example, a robot, and reference numeral 2 indicates a base material on the lower side of the welding machine, and an inner cylindrical conductor is attached to the outer periphery of the torch 1. It is equipped with a contactor 3 and an outer cylindrical elastic or movable conductor contactor 5 facing the contactor 3 with a gap 4 therebetween, and an external power source 6 is provided between the contactors 3 and 5. A low voltage is applied to form a contact detector as a whole, and furthermore, a sensor 7 of the type or other type that detects a change in voltage due to contact between both contacts 3 and 5 is connected to the power source 6 and its input. An amplifier 8 is provided on the side, so that when the detector 7 is actuated, a relay contact or other contact 9 is closed and an output signal is obtained therefrom. The output signal may be sent to an alarm (not shown) to generate an alarm, or sent to a stop switch to stop the welding machine, or the like. In general, both contacts 3 and 5 are braced with each other via insulating materials 10 and 10 at both ends, and the above-mentioned interval 4 is obtained between them.

Furthermore, the inner contactor 3 may be of a type that uses the torch nozzle la of the welding torch 1 as is, as shown in the second figure, or it may be prepared separately from it, as shown in the third figure, in the latter case. , a damper member 11 is installed between the torch 1 and the torch 1 as necessary.
The impact can be alleviated by intervening. Note that the outer contactor 5 is generally made of aluminum foil, copper foil, or other metal foil, for example. To explain the operation, consider a case where the welding torch 1 accidentally comes into contact with a workpiece prepared on the side of the workpiece, that is, the base material 2 via a pick-up tool, or other foreign matter. acts on the outer contactor 5 to press and deform it inward, thus creating a contact between both contacts 3 and 5, through which the voltage is introduced, and the change is detected by the detector 7. be done.

As described above, according to the present invention, the welding torch is provided with inner and outer guide box contacts on the outer periphery, and a low voltage is applied between the two contacts. This has the effect of making the operation simple and reliable, and making it easy to use.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the entirety of one example of the device of the present invention, FIG. 2 is an enlarged cross-sectional side view of its essential parts, and FIG. 3 is a cross-sectional side view of a modification thereof. 1... Welding torch, 3, 5... Conductor contact, 4...
... Interval, 7... Detector. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. On the outer periphery of the welding torch extending from the welding machine body, there is an inner cylindrical conductive contact, and an outer cylindrical elastic or flexible conductive contact facing with a gap therebetween. A low voltage is applied between both contacts to form a contact detection amount, and a detector is provided to detect a change in the voltage due to contact between both contacts, so that a signal can be obtained from the detector. Welding machine safety equipment consisting of: