JP2630415B2 - Protection net for welding cable - Google Patents

Description

The present invention relates to a protection net for covering a welding cable of a spot welding machine to prevent disconnection thereof.

b. Conventional technology and its problems In a spot welding machine as shown in FIG. 8, as the welding gun a moves, a sharp bending occurs at the connection between the primary cable b and the transformer c. Then, since the welding gun a repeats a severe movement while bending the cable b, it is disconnected in a short period of time. Therefore, conventionally, the cable b was covered with a wire net to reduce the bending, but the effect of extending the life of the primary cable b could not be expected so much.

Also, in the spot welding machine in which the transformer is arranged at a position away from the welding gun as shown in FIG. 9, there is a problem that the auxiliary cable d is disconnected in a short period of time as in the above-described apparatus. Further, in this device, since a large tensile force is applied to the auxiliary cable d during the operation, if the soldering between the conductor of the cable d and the connector e is incomplete, the conductor will fall out of the connector e. There was something.

In addition, any of the devices has a disadvantage in that a defective wire occurs due to partial disconnection of a conductive wire in a cable.

c. Means for Solving the Problems The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a protection net capable of extending the life of a welding cable. In a protective net covering the current-carrying cable of the spot welding machine, the cable is covered in close contact with the outer periphery of the elastic covering member constituting the cable, and is inclined in the opposite direction at substantially the same angle with respect to the axis of the cable. A wire that intersects with each other and another wire woven along with the wire near the connection end of the cable form a multiple knit portion, and the end of the multiple knit portion is connected to the elastic covering member of the cable with the connector. A protection net for a welding cable, wherein the protection net is integrally connected by an end of the welding cable.

Hereinafter, embodiments of a protection net for a welding cable according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 to FIG. 3 show a case where this protection net is attached to a primary cable of a spot welding machine.

In the figure, reference numeral 1 denotes a welding robot having a transformer 3 and a welding gun 4 at the tip of an arm 2. A primary cable 6 is connected to the transformer 3 via a connector 5. Reference numeral 7 denotes a protection net according to the present invention, which covers the outer periphery of the primary cable 6 over a predetermined range from each connection end. As shown in FIG. 2, the protection net 7 is formed in a tubular shape by oblique weaving with stainless steel wires 7a which are inclined at substantially the same angle and in opposite directions with respect to the axis of the cable and cross each other. Then, it is tightly covered over the outer periphery of a rubber hose (similar to the rubber hose 12a shown in FIG. 6) as an elastic covering member constituting the primary cable 6, and is inserted into the connector 5 together with the rubber hose. It is coupled to the connector 5 by caulking the end 5a.
Note that another wire 7a 'is knitted in the protective net 7 so as to be in contact with the wire 7a from the end edge to the middle part (this knitting method is referred to as multiple knitting in this specification).

Further, as shown in FIG. 3, the wire 7a 'may be changed to a wire having a larger diameter than the wire 7a having a smaller diameter so as to obtain a desired toughness.

In this way, the protection network 7 of the present embodiment has the primary cable 6.
Therefore, even if the welding gun 4 moves suddenly, the protection net 7 resists the bending of the primary cable 6 and reduces the bending at the connection portion. Further, since the protection net 7 has higher fatigue strength than the conventional metal net, it is not damaged in a short period of time.

Next, another embodiment in which the protection net of the present invention is attached to a secondary cable of a spot welding machine will be described with reference to FIGS. 4 to 7. FIG. Note that the same components as those in the above-described embodiment are denoted by the same reference numerals and description thereof will be omitted.

In the figure, 10 is a transformer, 11 is a kickless cable, and 12 is an auxiliary cable. The auxiliary cable 12 is covered with the protection net 7 of the present invention over the entire outer periphery thereof.
The auxiliary cable 12 is connected to the welding gun 4 via a connector 13.
Connected to Specifically, as shown in FIG. 6, the connector 13 includes a fixing bracket 13a to which the protection net 7 is fixed, an insertion portion 13b inserted into the rubber hose 12a of the auxiliary cable 12, and a terminal 13c connected to the welding gun 4. And a clip ring 13 for crimping the rubber hose 12a to the connection fitting 13d.
e and a fastening ring 13f screwed to the fixing bracket 13a. The connection fitting 13d has a conductor 12d of the auxiliary cable 12.
Are fixed, and a knurl 13g is formed on the inner peripheral surface of the clip ring 13e. As a result, the rubber hose 12 is firmly crimped to the connection fitting 13d, and even if a large tensile force is applied to the auxiliary cable 12 during the operation,
The connection fitting 13d is prevented from falling out of the rubber hose 12a. 14 is a water pipe.

In this manner, the protection network 7 of this embodiment is
As described above, the bending that occurs in the cable 12 is reduced as in the case described above. The protection net 7 is
It is tightly covered on the outer periphery of the rubber hose 12a as an elastic covering member, and has a structure in which the entire cable is tightened. To prevent the connection points from being broken.

d. Effects of the Invention According to the present invention, the protective net is closely adhered to the outer periphery of the elastic covering member constituting the cable, and intersects with each other by being inclined in the opposite direction at substantially the same angle with respect to the axis of the cable. Since the wire and the other wire woven along with the wire near the connection end of the cable form a multi-knitted portion, when the cable is bent, the wire is pulled to the outside where the radius of curvature of the bent portion of the net is large. Power works, and as a result,
The diameter of the protective net shrinks, and the elastic covering member is tightened.The protective net bears most of the load, reducing the load on the conductors and greatly extending the life before disconnection. The operation rate can be improved. The same effect can be obtained when the cable is simply pulled.

Further, the effect of reducing the frequency of occurrence of welding defects caused by partial disconnection of the welding cable can be obtained.

[Brief description of the drawings]

1 and 2 show an embodiment of a protection net for a welding cable according to the present invention. FIG. 1 is a perspective view showing a mode of use of the protection net, and FIG. 2 is a primary cable of FIG. FIG. 3 is a view showing a modified example of the protection net corresponding to FIG. 2, FIG. 4 to FIG. 6 are views showing another embodiment of the present invention, and FIG. 5 is a view corresponding to FIGS. 1 and 2, respectively. FIG. 6 is an enlarged view showing a part of the connector shown in FIG. 5, and FIG. 7 is a clip used for the connector. An enlarged view showing a part of the ring cut away,
8 and 9 are explanatory views conceptually showing the configuration of the spot welding machine. 4 welding gun, 6 primary cable, 7 protection net, 7a, 7a 'stainless steel wire, 12 auxiliary cable.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-156584 (JP, A) JP-A-61-185586 (JP, U)

Claims (1)

(57) [Claims] In a protection net for covering a current-carrying cable of a spot welding machine, the protection net is closely adhered to the outer periphery of an elastic covering member constituting the cable, and is arranged in the opposite direction at substantially the same angle with respect to the axis of the cable. A multi-knitted portion is formed by a wire that is inclined and intersects each other and another wire that is woven along with the wire near the connection end of the cable, and the end of the multi-knitted portion is elastically coated with the cable. A protection net for a welding cable, which is integrally connected to an end of a connector together with a member.