JPH05439A - Apparatus for removing foreign matter in vacuum retaining connection cylinder between apparatuses - Google Patents

Abstract

PURPOSE:To enable foreign matters to be removed even in the case where they adhere to a cable core under vacuum. CONSTITUTION:In a foreign matter removing apparatus in a vacuum retaining connection cylinder for combining by retaining vacuum the space where a cable core 1 is delivered from a vacuum can 8 housing a cable core 1 to a metal sheath extruder 4, an observation hole 9 for inspecting the cable core 1 under delivery is provided, and a foreign matter removing nozzle 1 is provided on the connecting cylinder 3 in the proximity thereof, which is adapted to blow dry gas to the cable core 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foreign matter removing device in a connecting cylinder for holding vacuum between devices for removing foreign substances adhering to a cable core before a metal sheath coating process of an electric power cable, particularly an oil-filled power cable. It is a thing.

[0002]

2. Description of the Related Art As a main method of manufacturing an OF cable, there is a step of covering a cable core with a metal sheath such as a lead sheath or an aluminum sheath under vacuum. FIG. 4 shows an example of a vacuum lead process, in which 1 is a cable core, 2 is a basket in which the cable core 1 is wound,
Reference numeral 3 is a connecting cylinder for connecting the vacuum can 8 accommodating the basket 2 and the metal sheath extruder 4 while maintaining a vacuum state, 5 is a winding drum, and 6 is a guide roll provided in the connecting cylinder 3.

The cable core 1 delivered from the basket 2 installed in the vacuum can 8 reaches the metal sheath extruder 4 while maintaining the vacuum state in the connecting cylinder 3, and the metal sheath 7 is extruded on the outer periphery thereof. It is covered and wound up by the winding drum 5.

[0004]

By the way, when a foreign substance adheres to the cable core 1 in the vacuum can 8 or the connecting cylinder 3, even if an attempt is made to remove the foreign substance, it cannot be removed because of the vacuum atmosphere. is there.

Usually, when the basket 2 in which the cable core 1 is wound is put into the vacuum can 8, the foreign matter on the cable core 1 is removed before the vacuum is started.

However, since this foreign matter is removed in the atmospheric condition (before the start of vacuum), it must be performed within a limited time. That is, if the cable core 1 is exposed to the atmosphere for a long time, there arises a problem that a large amount of moisture is absorbed. Further, when the cable cores are stacked in several stages, there is a problem that only foreign matter on the uppermost cable core can be removed. Furthermore, even if the foreign matter can be found in a vacuum, the foreign matter cannot be removed. Therefore, the metal sheath is coated while the foreign matter remains attached, and the cable becomes defective.

An object of the present invention is to solve the above-mentioned drawbacks of the prior art and to provide a foreign matter removing device in a connecting cylinder for holding vacuum between devices, which is capable of removing foreign matter even if it adheres to a cable core in a vacuum. It is in.

[0008]

In order to achieve the above-mentioned object, the present invention aims to deliver a cable core from a vacuum can in which the cable core is accommodated to a metal sheath extruder, while maintaining a vacuum with a connecting tube. In the foreign matter removing device in the inter-apparatus vacuum holding connecting cylinder, the connecting cylinder is provided with foreign matter monitoring means for observing whether foreign matter is attached to the cable core being sent, and in the vicinity of the connecting cylinder, A foreign matter removing nozzle is provided to blow dry gas onto the cable core in order to remove foreign matter attached to the cable core. The foreign matter monitoring means is composed of a viewing window provided in the connecting cylinder, a foreign matter detecting sensor airtightly provided on the wall of the connecting cylinder, or arranged in the connecting cylinder.

[0009]

According to the above construction, the foreign matter monitoring means monitors whether or not the foreign matter is attached to the cable core being sent out, and if the foreign matter is attached, a dry gas containing no water is ejected from the foreign matter removing nozzle. The foreign matter can be easily removed even in a vacuum by removing the foreign matter.

[0010]

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows an overall view of the foreign matter removing device in the inter-device vacuum holding connecting cylinder of the present invention, which is basically the same as the manufacturing device described in FIG. That is, in the figure, 1 is a cable core, 2 is a basket in which the cable core 1 is wound, 3 is a connecting cylinder for connecting a vacuum can 8 accommodating the basket 2 and a metal sheath extruder 4 while maintaining a vacuum state. Is a winding drum, and 6 is a guide roll provided in the connecting cylinder 3.

The cable core 1 delivered from the basket 2 installed in the vacuum can 8 reaches the metal sheath extruder 4 while maintaining the vacuum state in the connecting cylinder 3, and the metal sheath 7 is extruded on the outer periphery thereof. It is covered and wound up by the winding drum 5.

In the present invention, as shown in FIGS. 1 and 2, the connection window 3 has a viewing window 9 as a plurality of foreign matter monitoring means.
Is provided, and it is possible to monitor whether foreign matter is attached to the cable core 1 through the viewing window 9.
In the vicinity of the viewing window 9, especially on the downstream side, the cable core 1
A plurality of foreign matter removing nozzles 11 for spraying dry gas such as N ₂ gas and dry air are provided toward the. The foreign matter removing nozzle 11 is a pipe 1 connected to a gas cylinder 12.
An opening / closing valve 10 is connected to the nozzle 4, and a nozzle portion 15 at the tip of the pipe 14 is provided and arranged toward the axis in the connecting cylinder 3. This nozzle unit 15 is shown in FIG.
As shown in (a), a total of four pieces are arranged every 90 degrees, and are provided so as to be sprayed on the entire circumference of the cable core 1.
The nozzle portion 15 may be provided so as to intersect the axis of the cable core 1 at 90 degrees as shown by the solid line in FIG. 2B, or the tip may be inclined toward the upstream side as shown by the dotted line in the figure. It may be provided.

The nozzle section 15 is shown in FIGS.
As shown in (b), a ring 13 surrounding the cable core 1 may be provided with a plurality of nozzle openings 16 so as to open upstream. In this case, there is an advantage that only one pipe 14 and one opening / closing valve 10 are required. The foreign matter monitoring means may be constituted by a foreign matter detection sensor that is airtightly provided in the connecting cylinder or a foreign matter detection sensor arranged in the connecting cylinder, in addition to the viewing window 9 described above. Specifically, as the foreign matter detection sensor, for example, a night-vision camera or a fiberscope is used, which is airtightly attached to the wall of the connecting tube or placed in the tube, and the lead portion of the sensor is moved from the connecting tube to the outside of the tube. Pull out and connect to external monitoring equipment to monitor foreign objects.

Next, the operation of the embodiment will be described.

When the cable core 1 passes through the connecting tube 3, whether or not there is a foreign object on the cable core 1 is monitored through a viewing window 9 which is a foreign object monitoring means provided on the connecting tube 3. When there is a foreign substance, the opening / closing valve 10 is opened instantaneously (within about 1 second) from the closed state when passing through the foreign substance removing nozzle 11. By this opening and closing, N ₂ gas or dry air of 1 to ² kg / cm ² is blown out from the nozzle portion 15 to the cable core 1 through the pipe 14, and the adhering foreign matter is blown off. The blown foreign matter falls below the guide roll 6 of the connecting cylinder 3 and does not re-adhere.
At this time, the degree of vacuum of the connecting cylinder 3 is instantaneously lowered from 0.01 Torr or more to 0.1 Torr, but since the vacuum is continuously evacuated, the degree of vacuum is immediately returned to the normal degree of vacuum.
If there is another foreign matter on the cable core 1, the above operation may be repeated.

The dry gas blown out from the foreign matter removing nozzle 11 may be any gas other than the above-mentioned gases as long as it does not impair the electrical characteristics of the cable core 1. An electromagnetic valve may be used as the opening / closing valve 10. In this case, the valve 10 may be any valve that can maintain the degree of vacuum from the valve 10 to the tip of the nozzle portion 15.

It is to be noted that the peep window 9 is a very good peep window in which a peripheral window is formed integrally with a part of the connecting cylinder 3. In addition, when monitoring foreign matter through the viewing window, the optical appearance inspection device optically detects the foreign matter, and in conjunction with this, the on / off valve 10 is turned on / off.
Alternatively, the automatic removal may be performed.

[0019]

In summary, according to the present invention, it is possible to remove foreign matter by adhering to the cable core with foreign matter monitoring means such as a viewing window and blow dry gas from the removal nozzle if there is foreign matter. It is possible to completely remove foreign matter while maintaining a vacuum and without damaging the cable. In addition, since foreign matter can be removed in the connecting cylinder, removal of foreign matter when the vacuum can is inserted into the vacuum can can be simplified, and the work time of the container can be shortened.

[Brief description of drawings]

FIG. 1 is an overall view showing an embodiment of the present invention.

FIG. 2 is a diagram showing a main part of the present invention.

FIG. 3 is a diagram showing another embodiment of FIG.

FIG. 4 is an overall view showing a conventional example.

[Explanation of symbols]

1 cable core 3 connecting tubes 4 Metal sheath extruder 8 vacuum cans 9 Viewing window (foreign matter monitoring means) 11 Foreign matter removal nozzle

Claims (3)

[Claims] Claim: What is claimed is: 1. A vacuum core in which a cable core is housed is fed to the metal sheath extruder to deliver the cable core between them.
In the foreign matter removing device in the inter-apparatus vacuum holding connecting cylinder connected while holding the vacuum in the connecting cylinder, the connecting cylinder is provided with foreign matter monitoring means for observing whether foreign matter is attached to the cable core being sent, and A foreign matter removing device for an inter-apparatus vacuum holding connecting cylinder, characterized in that a foreign matter removing nozzle for blowing a dry gas to the cable core to remove foreign matter adhering to the cable core is provided in the neighboring connecting cylinder. 2. The foreign matter removing device in the inter-apparatus vacuum holding connecting cylinder according to claim 1, wherein the foreign matter monitoring means comprises a viewing window provided in the connecting pipe. 3. The foreign matter removing device in the inter-apparatus vacuum holding connecting cylinder according to claim 2, wherein the foreign matter monitoring means is a foreign matter detecting sensor which is airtightly provided on the wall of the connecting pipe or arranged in the connecting pipe. .