JPH0637541Y2 - Water cooling cable for electric furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a water cooling cable for power supply used in an electric furnace, particularly an arc furnace for steelmaking.

[Technical background of the invention and its problems] Since a power supply cable for an electric furnace, particularly an electric furnace such as an arc furnace for steelmaking, carries a very large current, a multi-core stranded wire and water cooling should be applied. Is normal.

Thus, a water-cooled cable for an electric furnace has a cable conductor formed by twisting a large number of core wires and a rubber hose surrounding the cable conductor to form a cooling water passage. The rubber hose includes an internal rubber layer, a reinforcing layer, and an external layer. And a rubber layer.

Since the electric furnace as described above repeatedly tilts and turns,
The water-cooled cable for power supply is frequently bent and twisted, and the inner surface of the rubber hose is worn by friction with the cable conductor. When this wear reaches the reinforcing layer, the rubber hose is in a state of being on the verge of causing water leakage, and once water leakage occurs, it causes various accidents.

[Object of the Invention] The present invention has been made based on the above circumstances, and it is possible to easily and surely grasp the wear state of the rubber hose forming the cooling water passage, and the time of the cable or the rubber hose of the rubber hose can be checked before the occurrence of water leakage. It is an object of the present invention to provide a water cooling cable for an electric furnace that can be replaced and prevent accidents due to water leakage.

[Summary of the Invention] A water cooling cable for an electric furnace of a hose comprises a cable conductor, a terminal fixed to the terminal thereof, and a hose in which the terminal is airtightly attached to the terminal. A conductive layer is provided on the inner surface of the reinforcing layer interposed between the inner rubber layer and the inner rubber layer.

In the water cooling cable for an electric furnace of the present invention having the above-mentioned configuration, the continuity between the terminal and the conductive layer is measured at the end face of the hose end, and if there is continuity, abrasion is caused from the inner rubber layer of the hose to the reinforcing layer and leakage The water cooling cable itself or the rubber hose can be replaced in a timely manner to prevent water leakage.

[Embodiment of the Invention] FIG. 1 is a vertical sectional view of a first embodiment of the present invention. In this figure, a terminal 2 made of copper is attached to the end of the cable conductor 1, and a cavity 3 for supplying cooling water is provided in this terminal. Two circumferential grooves 4 are provided on the outer circumference of the end of the terminal 2 on the cable side, and a rubber hose 6 having an inner diameter that forms a cooling water passage 5 between the terminal 2 and the cable conductor 1 is formed at the portion of the groove 4. And is fixed to the terminal 2 by a band 7 made of stainless steel. In the figure, reference numeral 8 denotes a through hole that connects the hollow portion 3 and the cooling water passage 5.

Thus, the rubber hose 6 has an inner rubber layer 6a and a conductive rubber layer.
6b, a reinforcing cloth layer 6c, and an outer rubber layer 6d are laminated in this order to form a four-layer structure, and the outermost periphery is covered with a heat resistant layer 6d.

In the water cooling cable for an electric furnace of the present invention having the above-mentioned configuration, the conduction between the terminal 2 of the cable end and the conductive rubber layer 6b exposed on the end face of the rubber hose 6 is measured by the tester 9,
The progress of wear of the hose 6 can be determined. That is, the inner rubber layer 6a, the cable conductor 1, and the conductive rubber layer 6b
, The tester 9 is in a conductive state, indicating that the inner rubber layer 6a is almost worn. In this state, the rubber hose 6 will leak water soon, so
The rubber hose will have to be replaced. Therefore, it is possible to prevent damage due to water leakage of the rubber hose.

FIG. 2 in which the same parts as those in FIGS. 1 and 2 are designated by the same reference numerals is a longitudinal sectional view of a second embodiment of the present invention. In this embodiment, the inner rubber layer 6a is replaced with the conductive rubber layer 6b of the first embodiment.
A soft and thin non-magnetic metal wire is spirally wound on top to form a conductive layer 6b '. Also in this embodiment, the same effect as that of the second embodiment can be obtained.

The metal wire is preferably a thin annealed copper wire having a diameter of about 1 mmφ, and may have an enamel or other insulating coating.

[Advantage of the Invention] As is clear from the above, in the water-cooled cable for an electric furnace of the present invention, the progress of wear of the rubber layer of the rubber hose of the cable can be grasped easily and surely. Thus, the water cooling cable or the rubber hose can be replaced in a timely manner, and various accidents due to water leakage of the water cooling cable can be prevented.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of the first embodiment of the present invention, and FIG. 2 is a vertical sectional view of the second embodiment. 1 ... Cable conductor, 2 ... Terminal, 3 ... Hollow part, 4 ...
… Concave groove, 5 …… Cooling water passage, 6 …… Rubber hose, 6a ……
Inner rubber layer, 6b ... Conductive rubber layer, 6c ... Reinforcing cloth layer, 6d ...
… External rubber layer, 7 …… band, 8 …… through hole

Claims (1)

[Scope of utility model registration request] 1. A cable conductor, a terminal fixed to the terminal thereof, and a hose in which the terminal is airtightly attached to the terminal, wherein the hose is interposed between an outer rubber layer and an inner rubber layer of the hose. Water cooling cable for an electric furnace, characterized in that a conductive layer is provided on the inner surface of the reinforced layer.