JPH09296297A - Electrolytic degreasing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove the stains on the inside surface of a pipe which is heretofore not washed. SOLUTION: Jigs 2a, 2b are arranged at both ends of a tubular member 1 which is an object to be washed. The jig 2a arranged at one end of this tubular member 1 is provided with a supply port 3 for pouring a degreasing liquid. The jig 2b at the other end is provided with a discharge port 4 for discharging this liquid. The tubular member 1 is connected to the anode of a power source 5. The cathode is connected to an electrode 6 arranged on the central axis of the tubular member 1. Two pieces one set of intra-tube permanent magnets 8 hermetically stored in a plastic vessel and connected by the metallic rod 7 are arranged in two sets in the position symmetric with the central axis in the tubular member 1. One set of the magnets is arranged by disposing the different magnetic poles of S and N opposite to each other. The out-of-tube permanent magnets 10 are arranged in the positions facing the intra- tube permanent magnets 8 on the outside of the tubular member 1. The out-of- tube permanent magnets 10 are fixed by jigs 11 for fixing the out-of-tube magnets.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolytic degreasing device for removing contaminants on the inner surface of a tubular member by electrolytic degreasing.

[0002]

2. Description of the Related Art When a metal surface is subjected to chemical conversion treatment, plating or painting, if oil, fat, mineral oil or dust adheres to the metal surface, the above-mentioned processing cannot be carried out uniformly at the adhered portion. You have to remove things. In particular, when the degreasing treatment for removing oily stains is insufficient, defects such as poor adhesion of the plating layer, stains, bulges, and poor gloss occur on the product surface.

Conventionally, an electrolytic degreasing method has been used as a degreasing treatment for removing oily dirt attached to the inner surface of a tubular member. When performing the degreasing treatment by this electrolytic degreasing, first, the auxiliary electrode connected to the cathode of the power source is arranged on the central axis of the tubular member, and the tubular member is connected to the anode of the electrode. The tubular member is degreased by immersing the tubular member in a degreasing liquid or flowing a degreasing liquid into the member while energizing.

[0004]

However, as in the prior art, if electric degreasing is performed only by energizing between the auxiliary electrode on the inner surface of the tubular member and the inner wall of the tube, stains that are difficult to remove are present, and sufficient stains are present. The degreasing process could not be performed. It is an object of the present invention to provide an electrolytic degreasing device capable of effectively degreasing the inner surface of a tubular member and capable of removing dirt that has not been removed by a conventional device.

[0005]

The electrolytic degreasing device of the present invention is constructed as follows. (1) In the electrolytic degreasing device of the present invention, a liquid flow of a degreasing liquid composed of an aqueous electrolyte solution is formed in a tubular member, and a current is passed between an electrode arranged at the center of the tubular member and the tubular member. In the electrolytic degreasing device for degreasing the inner wall surface of the tubular member, different magnetic poles are arranged in the vicinity of the inner wall surface of the tubular member so as to face each other in a direction parallel to the central axis of the tubular member, and the inner wall surface of the tubular member is separated. At least one pair of in-tube magnets movably arranged along the tubular member, and an in-tube magnet disposed in the vicinity of the outer wall surface of the tubular member so as to exert an attractive force between the tubular magnet with the wall of the tubular member interposed therebetween. It is characterized by comprising an outer tube magnet movably arranged along the outer wall surface of the member, and means for moving the outer tube magnet along the outer wall surface of the tubular member. (2) The in-tube magnet and the out-tube magnet are provided with a mechanism capable of smoothly moving. (3) An air gap is provided between the magnet and the wall surface of the tubular member. (4) The in-tube magnet can move over the entire surface of the inner wall to be cleaned. (5) The in-tube magnet and the out-tube magnet are permanent magnets. (6) The magnet is composed of, for example, a rare earth, and is preferably a strong magnet. (7) The pair of in-tube magnets are connected by a thin metal rod. (8) The in-tube magnet and the out-of-tube magnet are hermetically stored in a plastic container having four projections in contact with the tube wall.

The operation and effect of the above configuration will be described with reference to FIG. 2A is a sectional view of a plane parallel to the tube axis, and FIG. 2B is a sectional view of a plane perpendicular to the tube axis. A magnetic field 12 is formed in a direction parallel to the tube axis by a set of two tube magnets 8 arranged at intervals near the inner wall surface of the tubular member 1. Further, by flowing an electrolyte aqueous solution into the tubular member and applying a voltage between the tube wall of the tubular member 1 and the electrode 6 arranged on the central axis of the tube, a current 13 is generated in a direction perpendicular to the tube wall. Flowing. Since the directions of the magnetic field and the current are orthogonal to each other, the electromagnetic force 14 acts in the circumferential direction of the tube.

The degreased liquid electrolyzed by applying an electric current between the electrode 6 and the tubular member 1 receives a force in the circumferential direction of the pipe by the electromagnetic force 14 formed, and a liquid flow along the circumferential direction is generated. It is formed. Therefore, as the flow of the degreasing liquid in the pipe, a liquid flow in the axial direction of the pipe by flowing the degreasing liquid in the pipe,
There is a liquid flow in the circumferential direction of the tube.

By the liquid flow in the circumferential direction of the pipe which has not existed in the past, dirt such as oil adhered to the inner wall can be efficiently removed, and the dirt which could not be removed in the past can be removed. Further, by moving the extra-tube magnet 10 provided on the outer wall and moving the intra-tube magnet 8, a circumferential liquid flow passes through the entire degreasing target portion on the inner surface of the tubular member 1 to degrease the entire degreasing target portion. You can

[0009]

1 is a sectional view of an electrolytic degreasing apparatus according to an embodiment of the present invention. Here, (a) of FIG. 1 is a cross-sectional view of a plane parallel to the axis of a tubular member described later, and (b) of FIG. 1 is a cross-sectional view of a plane perpendicular to the axis of the tubular member.

The jigs 2 (2
a, 2b) are arranged. The jig 2a arranged at one end of the tubular member 1 is provided with a supply port 3 for pouring the degreasing liquid into the tubular member 1, and the jig 2b at the other end.
Is provided with a discharge port 4 for discharging. Degreasing liquid is pumped (not shown) from a reservoir tank (not shown)
Thus, it is made to flow into the tubular member 1 from the supply port 3 and is discharged to the outside from the discharge port 4. Then, the degreased liquid discharged from the discharge port 4 is returned to the reservoir tank and used again.

A power source 5 is provided outside, a tubular member 1 is connected to the anode of the power source 5, and an electrode 6 arranged on the central axis of the tubular member 1 is connected to the cathode of the power source 5. An electric current is made to flow through the degreasing liquid flowing in the No. 1 unit.

Further, in the tubular member 1, two in-tube permanent magnets (in-tube magnets) 8 which are hermetically stored in a plastic container and connected by a metal rod 7 are arranged at two positions symmetrical with respect to the central axis. ing. The two in-tube permanent magnets 8 are arranged so that magnetic poles of different S and N face each other and are parallel to the central axis. The in-tube permanent magnet 8 is composed of a samarium-cobalt magnet or the like. In addition, in the plastic container for storing the permanent magnet 8 in the tube, there are four protrusions in contact with the tube,
There is a gap between the main body of the magnet 8 and the tubular member 1 so that it can move smoothly. The four protrusions are installed, for example, near the apex.

An external permanent magnet (external magnet) 10 is arranged outside the tubular member 1 so as to face the internal permanent magnet 8. The outer permanent magnet 10 is arranged so that an attractive force acts between the outer permanent magnet 10 and the inner permanent magnet 8. Then, the in-tube permanent magnet 8 is held near the wall surface by the attractive force. Like the in-tube permanent magnet 8, the out-of-tube permanent magnet 10 is housed in a plastic container provided with four protrusions. The external permanent magnet 10 is fixed by an external magnet fixing jig 11. Then, the jig 11 is rotated in the circumferential direction of the pipe and moved in parallel in the pipe axis direction to move the extra-tube permanent magnet 10. Then, the in-tube permanent magnet 8 moves along with the movement of the out-of-tube permanent magnet 10.

As the tubular member 1, a straight pipe made of an aluminum alloy having a diameter of about 10 cm and a length of about 50 cm is prepared.
A slight amount of machining oil was applied to the inner surface to repel water. As the degreasing liquid, use a commercially available alkaline degreasing liquid,
The flow was made to flow in the tube at a flow rate of about 20 l / min. In addition, an aluminum wire having a diameter of about 3 mm is used as the electrode 6, and 1 A
Current was applied at a current density of / dm ² .

Under the above conditions, the outer permanent magnet 10 is moved over a range of a length of about 10 cm in the central portion to perform degreasing treatment, and then the tubular member 1 is rinsed with warm water and cut into a pipe. When the surface was examined, some water repellency remained on the portion where the in-tube permanent magnet 8 was not moved (corresponding to cleaning of the conventional apparatus). On the other hand, a clean surface without water repellency was obtained at the portion where the in-tube permanent magnet 8 was moved for cleaning the apparatus of this embodiment, and the degreasing effect of the electrolytic degreasing apparatus of this embodiment was confirmed.

The electrolytic degreasing apparatus according to this embodiment has a tubular member 1.
By arranging the in-tube permanent magnet 8 in the inside to form a liquid flow of the degreasing liquid in the circumferential direction, it is possible to effectively remove dirt such as oil adhering to the inner surface of the tubular member 1. Moreover, since the magnet is a permanent magnet, it is not necessary to supply a current unlike the electromagnet, so that the device can have a simple structure. Further, by storing the magnet in a plastic container having a protrusion, the magnet can be smoothly moved inside and outside the tube.

The present invention is not limited to the above embodiment. For example, in the embodiment, two in-tube magnets and one outside-tube magnet are configured as one set, but three or more magnets may be set as one set. Further, the number of in-tube magnets arranged in the tubular member is not limited to two, and may be one or three or more.

The in-tube magnet and the out-tube magnet are not limited to the samarium-cobalt magnet, and any magnet having a strong magnetic force can be used. The magnets inside and outside the tube are not limited to permanent magnets, but may be electromagnets.

In the embodiment, the metal rods are used to connect the pair of in-tube permanent magnets, but they can be connected by any substance. The magnet inside the tube and the magnet outside the tube may not be stored in the plastic container. However, the magnets inside and outside the tube must be able to move smoothly. In addition, various modifications can be made without departing from the spirit of the present invention.

[0020]

According to the electrolytic degreasing apparatus of the present invention, by disposing a magnet in the tubular member to form a liquid flow of the degreasing liquid in the circumferential direction, it is possible to effectively remove dirt such as oil adhered to the inner surface of the tubular member. Can be removed.

[Brief description of drawings]

FIG. 1 is a sectional view of an electrolytic degreasing device according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining the function and effect of the electrolytic degreasing device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tubular member 2 Jig 3 Supply port 4 Discharge port 5 Power supply 6 Electrode 7 Metal rod 8 In-tube permanent magnet (in-tube magnet) 10 Out-of-tube permanent magnet (out-of-tube magnet) 11 Out-of-tube magnet fixing jig

Claims (1)

[Claims] 1. A degreasing solution for an inner wall surface is formed by forming a liquid flow of a degreasing liquid composed of an aqueous electrolyte solution in a tubular member and passing an electric current between an electrode arranged at the center of the tubular member and the tubular member. In the electrolytic degreasing device for performing, in the vicinity of the inner wall surface of the tubular member, different magnetic poles are arranged facing each other and spaced apart in a direction parallel to the central axis of the tubular member, and are movable along the inner wall surface of the tubular member. At least one pair of in-tube magnets arranged and an outer wall surface of the tubular member are arranged in the vicinity of the outer wall surface of the tubular member such that an attractive force acts between the in-tube magnet and the inner wall of the tubular member. An electrolysis degreasing device comprising: an outer tube magnet movably disposed so as to be movable, and means for moving the outer tube magnet along an outer wall surface of the tubular member.