JPH0735671Y2 - Welding machine cable - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a welding machine cable arranged between a transformer and a welding gun of a robot welding machine or the like.

[Prior Art] A cable used in a robot welding machine or the like may be broken or partially broken due to long-term use, and a sufficient welding current may not be supplied to a welding gun. Therefore, it is necessary to constantly monitor the current and voltage between both terminals of the cable.

FIG. 3 shows a conventional example thereof. In the figure, 31 is a cable arranged between the transformer 32 and the welding gun 33, and both sides of the cable 31 are for positive current. Terminals 34 and 35 and terminals 36 and 37 for negative current are provided, and a circuit for welding current is formed between the transformer 32 and the welding gun 33. The terminals 34, 35, 36, 37 are respectively connected to one ends of a current detecting conductor and a voltage detecting conductor. That is, the terminal 34 has a current detecting conductor 38 and a voltage detecting conductor 39, the terminal 35 has a current detecting conductor 40 and a voltage detecting conductor 41, and the terminal 36 has a current detecting conductor 42. A conductor 43 for voltage detection, a conductor 44 for current detection and a conductor 45 for voltage detection are connected to the terminal 37, and each conductor on the positive current side is connected.
The other end of 38, 39, 40, 41 is connected to the instrument 46, and the negative current side conductors 42, 4
The other ends of 3,44,45 are connected to a meter 47. Therefore instrument 4
6 allows the positive current and voltage in cable 31 to
With 7, the negative current and voltage in the cable 31 can be measured to know which twisted wires in the cable are broken or partially broken.

[Problems to be solved by the invention] By the way, in a robot welding machine or the like, the welding gun 33 side is moved considerably by the robot and therefore moves considerably more violently than the transformer 32 side. However,
Since the conductors 40, 41, 44, 45 connected to the terminals 35, 37 on the side of the welding gun 33 and the instruments 46, 47 are in a free state, they are moved due to the violent movement of the welding gun 33 and become fatigued. To do. Therefore, there is a problem that the conductor wire may be broken.

The present invention has been made in view of the above problems of the prior art, and the purpose thereof is to sufficiently protect the deterioration detecting conductor wire connected to the terminal on the welding gun side. An object of the present invention is to provide a cable for a welding machine, which is capable of extending the service life of the conductor wire by penetrating the inside of the outer hose of the cable.

[Means for Solving the Problems] In order to achieve the above object, the welding machine cable according to the present invention is provided with a cable deterioration detection conductor whose one end is connected to a welding gun side terminal of the cable. It penetrates the inside and pulls out from the transformer side.

[Operation] Since the conductor for detecting deterioration of the cable, one end of which is connected to the welding gun side terminal of the cable, is immediately penetrated through the outer hose of the cable and is guided to the instrument from the transformer side, which does not move much. Since the hose is protected by the hose, fatigue of the conductor is small, and the wiring of the conductor does not interfere with the welding work.

[Embodiment] An embodiment of the present invention will be described with reference to FIGS. 1 and 2.

In the figure, reference numeral 1 is a cable arranged between a transformer 2 and a welding gun 3, and terminals 1 and 4 for positive current and terminals 6 and 7 for negative current are provided on both sides of the cable 1, respectively. A welding current circuit is formed between the transformer 2 and the welding gun 3. Further, one end of each of the current detecting conductor and the voltage detecting conductor is connected to each of the terminals 4, 5, 6 and 7. That is, the terminal 4 is provided with a current detecting conductor 8 and a voltage detecting conductor 9, the terminal 5 is provided with a current detecting conductor 10 and a voltage detecting conductor 11, and the terminal 6 is provided with a current detecting conductor 12. Conductor 13 for voltage detection, conductor 14 for current detection and conductor 15 for voltage detection are connected to terminal 7, and each conductor on the positive current side is connected.
The other end of 8,9,10,11 is connected to the instrument 16, and each lead wire on the negative current side 12,13,1
The other ends of 4, 15 are connected to the measuring instrument 17.

The cable 1 has a separator 18 over substantially its entire length.
The stranded wires 20 for supplying a current for welding are alternately arranged between the respective separating pieces 19 of the separator 18.
The outer peripheries of the separator 18 and the twisted wire 20 are protected by the outer hose 21.

Lead wires 10, 11, 14, 15 connected to the terminals 5, 7 are the terminals 5, 7,
Is immediately guided into the outer hose 21 of the cable 1, and is guided to the transformer 2 side while penetrating the outer hose 21 in the separated state as shown in FIG. Then, the outer hose 21 is pulled out from the end on the transformer 2 side and connected to the measuring instrument 16 or 17.

Therefore, the instrument 16 measures the positive current and voltage in the cable 1 and the instrument 17 measures the negative current and voltage in the cable 1 to know which strands in the cable are broken or partially broken. .

[Advantage of the Invention] According to the present invention, the cable for detecting deterioration of the cable, one end of which is connected to the welding gun side terminal of the cable, is immediately guided into the outer hose of the cable and moved through the inner hose of the cable. Since it is guided to the measuring instrument from the side of the transformer with a small amount of heat, the conductor hose is protected from being protected by the outer hose, and the wiring of this conductor does not interfere with the welding work.

Therefore, it is possible to obtain a welding machine cable in which the service life of the deterioration detecting conductor wire can be sufficiently extended.

[Brief description of drawings]

FIG. 1 is a schematic layout view of a deterioration detecting device using a cable according to the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is an explanatory view of a conventional example. 1 ... Cable, 2 ... Transformer, 3 ... Welding gun, 4,
5,6,7 ... Terminal, 8,9,10,11,12,13,14,15 ... Conductor, 21 ...
… Cover hose.

Claims (1)

[Scope of utility model registration request] 1. A welding machine cable disposed between a transformer and a welding gun, wherein a cable for detecting deterioration of the cable, one end of which is connected to a welding gun side terminal of the cable, penetrates through the outer hose of the cable. The cable for the welding machine is characterized by being pulled out from the transformer side.