JPH0143029B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Application Field] The present invention involves continuously applying a rust preventive agent to a long spiral tube, removing the applied excess rust preventive agent, and This invention relates to a device for applying a rust preventive agent evenly and thinly to the surface of a spiral tube.

[Conventional technology and its problems]

Direct buried cables, such as metal corrugated pipe armored cables, are made by twisting the insulated wire cores with a jute interposed, wrapping a pressure tape and applying an inner sheath on top of it to form a core, forming a corrugated pipe on top of this, and then applying an outer sheath. It will be given.

In the production process of this metal corrugated pipe armored cable, antirust treatment is applied to the surface of the corrugated pipe. This is because if the exterior sheath that is extruded onto the corrugated pipe is made of vinyl chloride, a small amount of chlorine gas (corrosive gas) may be generated during the extrusion process and corrode the corrugated pipe.
This is intended to prevent corrugated pipes from corroding due to various environmental conditions after cable installation.

Here, if we look at the conventional apparatus for applying rust preventive agent and removing excess rust preventive agent, the rust preventive agent is dripped from the upper part of the spiral tube as it progresses, and the excess rust preventive agent is removed using a sponge or other device. I'm wiping it off.

With this device, the application of the rust preventive agent itself is uneven, and the excess rust preventive agent is wiped off with a sponge, etc., so be sure to thoroughly remove the excess rust preventive agent applied to the troughs of the spiral tube. As a result, the amount of rust preventive agent consumed increases, which is not desirable in terms of product quality control.Furthermore, the life of the sponge is short, which affects the operating rate of the equipment.

[Purpose of the invention]

In view of the above points, the present invention has been developed to apply a rust preventive agent uniformly, to sufficiently remove the excess applied rust preventive agent, and to apply the rust preventive agent extremely thinly and uniformly to the surface of a long spiral pipe. The purpose is to provide equipment.

[Means for achieving the purpose of the invention]

In order to achieve the above object, in the present invention, a rust preventive coating chamber through which the long spiral pipe is inserted is connected to a rust preventive removal means along the traveling direction of the long spiral pipe, and the rust preventive coating is applied An annular supply pipe is arranged in the room around the advancing long spiral pipe, and a plurality of spray nozzles are provided from the annular supply pipe toward the long spiral pipe, and the rust preventive agent removing means is installed in the casing. The long helical tube passes through the central axis of the cylindrical body, which is passed through the cylindrical body in an airtight manner, and an air permeable contact is provided on the inner surface of the cylindrical body so that its tip can be slidably contacted with the long helical tube. A hole communicating with the contactor was formed, and a suction pipe connected to a suction machine was attached to the casing.

[Effect]

In the present invention configured as described above, a rust preventive agent is sprayed around a long spiral tube advancing from a spray nozzle and uniformly applied to the spiral tube, and then, in a rust preventive removal means, a rust preventive agent is applied to the long spiral tube. When the inside of the casing is sucked while running, the air on the surface of the spiral tube is sucked through the gap between the contacts, and the excess rust preventive agent is also removed. At this time, the contact responds to the surface irregularities of the spiral tube by its bending or elasticity.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Reference numeral 1 denotes a rust preventive coating chamber, which can be opened and closed vertically on the horizontal plane of the passage of the long spiral tube 2, and an oil-resistant inlet 7 of the long spiral tube 2 inside the chamber. A rubber or plastic sealing plate 3 is attached with bolts 9, and on the downstream side there is an annular supply pipe 5 for a rust preventive agent with a plurality of spray nozzles 4 (four in this example) tilted upstream. A rust preventive agent is supplied by a known pump (not shown). A sleeve 6 having an inner diameter slightly larger than the outer diameter of the long spiral tube 2 is attached to the outlet 8 of the rust preventive application chamber 1 so as to be replaceable according to the outer diameter of the long spiral tube 2.

10 is a rust preventive agent removing means, 11 is a cylinder with many pores 12 around it, and both ends thereof are connected to a rotating shaft 13.
It is rotatably supported by bearings 14 provided at both ends of a casing 16, which will be described later. Cylinder 1
A long spiral tube 2 passes through the central axis of the tube 1, and a plate-shaped packing 22 is provided at the entrance thereof.

Reference numeral 15 denotes a bent ventilation contact mounted on the inner peripheral surface of the cylinder 11, such as a brush, an elastic porous body, or a fiber aggregate.

Reference numeral 16 denotes a casing surrounding the cylindrical body 11, and the casing 16 is provided with an intake pipe 17 connected to the blower 25 through a conduit 26. An air guide groove is provided on the inner surface of the casing 16 from the intake pipe 17 over the entire surface, so that air is evenly taken into the entire area inside the casing 16.

Next, the operations of applying the rust preventive agent and removing the excess rust preventive agent according to the above embodiment will be explained.

The advancing long spiral tube 2 is uniformly coated on its outer peripheral surface by four spray nozzles 4 in the rust preventive coating chamber 1. Since the rust preventive agent is sprayed toward the upstream side, excess rust preventive agent does not flow downstream. Rust agent is rust preventive agent outlet 1
Step 9 returns to the rust preventive tank (not shown).

Long spiral tube 2 exiting the outlet 8 of the rust preventive coating chamber 1
enters the cylindrical body 11 which is driven and rotated by a motor 21 via pulleys 18 and 24. Intake pipe 1
When the air in the rust preventive agent removing means 10 is sucked from 7, the rust preventive agent remaining on the surface of the long spiral tube 2 is sucked into the intake pipe 17 through the gap of the contactor 15 and the pores 12 of the cylinder body 11. The rust preventive agent and air are separated from each other in a gas-liquid separation tank 24 shown in FIG. 2, and only the air is discharged from a blower 25. Note that 20 in the figure is a support.

〔effect〕

As explained above, according to the present invention, the rust preventive agent is applied to the surface of the long spiral tube in just the right amount and the excess rust preventive agent remaining in the troughs of the spiral tube is sufficiently removed, and the entire surface of the spiral tube is thoroughly coated. Since it can be applied thinly and uniformly, it saves on rust inhibitors and improves the quality of products using long spiral tubes.

Furthermore, since the contact is sucked rather than wiped, there is no need to forcefully press the contact against the long spiral tube, so there are no parts that are subject to wear and tear, and the operating rate can be improved.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view of a main part of an embodiment of the apparatus according to the present invention, and FIG. 2 is a schematic explanatory diagram thereof. 1... Rust preventive application room, 4... Spray nozzle,
5... Annular supply pipe, 10... Rust preventive agent removal means, 1
1... cylinder body, 16... casing.

Claims (1)

[Scope of Claims] 1. A rust preventive coating chamber through which the long helical tube is inserted and a rust preventive removal means are connected along the traveling direction of the long helical tube, and a rust preventive agent removing means is connected to the rust preventive coating chamber through which the long helical tube passes; An annular supply pipe is arranged around the elongated helical pipe, and a plurality of spray nozzles are provided from the annular supply pipe toward the elongated helical pipe, and the rust preventive removing means includes a cylindrical body that penetrates the casing in an airtight manner. The long spiral tube passes through the central axis of the cylinder, a breathable contact is provided on the inner surface of the cylinder so that its tip can slide into contact with the long spiral tube, and the cylinder has a hole communicating with the contact. An apparatus for applying and removing a rust preventive agent to a long spiral tube, characterized in that the casing is provided with a suction pipe connected to a suction machine. 2. The apparatus for applying and removing a rust preventive agent to a long spiral pipe according to claim 1, wherein the spray nozzle is inclined upwardly of the advancing spiral pipe.