JP2657905B2 - Method of peeling coating material from coated electric wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of peeling a covering material from a covered electric wire coated with a resin such as vinyl chloride which is discarded or defective, and more particularly, to a method of removing an inner metal wire and an outer covering material. And a method for recovering each.

[0002]

2. Description of the Related Art Many methods have been devised and implemented for recovering a metal wire from a covered or defective covered wire to be disposed of. However, when roughly classified, the method is to incinerate or melt the covered wire. There are a method of removing the covering material, and a method of removing the covering material by applying pressure and impact after cooling the covered electric wire.

[0003] In the former, there are a case where the coating material is incinerated and a case where the inner metal wire is heated to a high temperature to melt the coating material. The coating can be peeled off from the metal wire. In the latter case, the coating material is cooled by a low-temperature liquid such as liquefied nitrogen to a temperature below the embrittlement point, and thereafter, the coating material is broken by applying pressure and impact, and is separated from the metal wire.

[0004]

However, when the insulated wire is incinerated, various harmful substances such as CO and CO ₂ are released at that time, so that there is a problem that the natural environment is polluted. On the other hand, in the case of a method in which the inner metal wire is heated to a high temperature to melt the outer coating material, such a problem does not occur. If heat is applied, oxidation progresses rapidly,
There is a problem in that the recovery rate for recycling the metal is reduced.

In the latter method of applying pressure, impact or the like to a coated electric wire cooled with liquefied nitrogen or the like, the applied force differs depending on the shape and size of the coated electric wire. As a result, the manner of destruction of the coating material varies, and a part of the coating material may remain without being peeled off. Further, in general, these processes require complicated steps, so that there is a problem that the apparatus becomes large-scale.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is intended to prevent the generation of harmful substances and the prevention of heat-induced problems such as oxidation of metal wires. The object of the present invention is to provide a material capable of efficiently and surely peeling a coating material from a metal wire efficiently and capable of continuously processing a large amount with a small device. The gist is a rolling step of rolling the coated electric wire into a continuous plate having a desired thickness, a cutting step of cutting the continuous plate in a width direction and cutting the strip into a strip, A cooling step of cooling the body until the coating material is below the embrittlement point, a pulverization step of pulverizing the coating material and peeling the coating material from the metal piece, and separating the powder into a metal piece and a powder of the coating material by sieving and recovering each. Insulated wire characterized by going through a sorting process In a method of peeling the coating material.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. In the drawings, reference numeral 1 denotes a covered electric wire whose outer periphery is covered with an insulating covering material. And a covering material 1B made of synthetic resin. Then, in the rolling step A, the coated electric wire 1 is used.
It is put into a rolling device 2 composed of a plurality of pairs of upper and lower rolling rollers 2A, 2B,... And rolled to a thickness of about 1 cm to form a continuous plate-like body 3.

Next, in the next cutting step B, the continuous plate-like body 3 formed by the rolling device 2 is cut in the width direction by a cutting device 4 comprising a pair of upper and lower cutters 4A, 4A to obtain a desired width. A thin strip 5 is formed. Since the strips 5 are formed through the rolling step A and the cutting step B as described above, even in various cases where the size of the insulated wire 1 is different, the individual shapes of the strips 5 are similar. Becomes Therefore, in the pulverizing step D to be described later, when the coating material 1B of the strip 5 is pulverized, the force applied to the strip 5 is substantially the same, so that the pulverization efficiency is improved.

Then, in the next cooling step C, the strip 5 is placed in a cooling tank 7 containing liquid nitrogen 6, and is left until the coating material 1B becomes brittle. At this time, the strip-shaped body 5 is a thin plate-shaped body entirely knitted, and the metal wire 1A in a knitted state is formed on both cut surfaces.
In addition, since the cut end surface of the coating material 1B is exposed, the surface area is significantly increased as compared with the coated electric wire 1 which is a substantially rod-shaped structure. Therefore, the cooling efficiency by the cooling liquid or the like is good, and the coating material 1B reaches the embrittlement point relatively quickly.

When the coating material 1B has reached the embrittlement point, the cooled strip-shaped body 5A is taken out of the cooling tank 7, and is cooled to the embrittlement point by the crusher 8 in the next crushing step D. The coating material 1B 'is pulverized, and the coating material 1B' is peeled from the surface of the metal material 1A '. In this case, the cut end surfaces of the metal wire 1A 'and the coating material 1B' in a knitted state are largely exposed on both cut surfaces of each cooled strip 5A, and the metal wire 1A 'is vertically moved. , It is sandwiched between the coating materials 1B 'and 1B' that are continuous only at the short portions on both side ends, so that the coating material 1B 'and the metal material 1A' are structurally easily separated from each other. The material 1B 'is reliably separated from the metal material 1A'.

As shown in FIGS. 4 and 5, the crusher 8 has a crushing case 9 composed of a cylindrical portion 9A and a funnel 9B, and a connecting plate 10A at the center of the crushing case 9.
It comprises a motor 11 installed in the cover 10B via a cylindrical motor cover 10B and a connecting member 10C, and an impeller 12 connected to a rotating shaft 11A and rotating horizontally. Then, the cooled strip-shaped body 5A is put into the center hole 13 formed in the upper disk 12A of the impeller 12.

As a result, each of the cooled strips 5A collides with each of the blades 12B of the impeller 12 by centrifugal force, and the coating material 1A cooled to the embrittlement point by the impact thereof.
B 'is surely separated from the metal material 1A', and only the separated coating material 1B 'is finely pulverized to form a coating material powder 1C.
Becomes

The metal material 1A 'and the coating material powder 1
C passes between the blades 12B of the impeller 12 and collides with the inner peripheral surface of the cylindrical portion 9A of the crushing case 9, and is collected by the lower funnel 9B and drops from the lower outlet 9C. This is sorted by a wire net 14 in a sorting step E.

That is, the size of the mesh 14A of the wire mesh 14 is set to a size that the metal material 1A 'cannot pass through. Therefore, the metal material 1A' remains on the wire mesh 14 and is covered. Material powder 1C only mesh 14A
, And falls below the wire net 14, so that in the sorting step E, the metal material 1A 'and the powder 1C of the coating material can be separated and collected.

[0015]

According to the method of the present invention for stripping a covering material from a covered electric wire, as described above, a rolling step of rolling the covered electric wire into a continuous plate having a desired thickness is performed. A cutting step of cutting into strips by cutting in the width direction, a cooling step of cooling the strips until the coating material is below the embrittlement point,
Since the pulverizing step of pulverizing the coating material and peeling off the coating material from the metal piece, a screening step of separating each of the metal piece and the powder of the coating material through a sieve and recovering each, a configuration is characterized by sequentially passing through, (1) When the cooling time is short, the coating material can be surely peeled off from the metal piece, thereby improving the economic efficiency and the working efficiency. (2) Since there is no generation of harmful substances and no oxidation of the metal pieces, recyclable metal pieces can be efficiently collected. (3) Since the device is simple and can be reduced in size, it can be provided at a low cost and can be installed in a narrow place.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the processing steps of the present invention.

FIG. 2 is an explanatory schematic diagram showing rolling and cutting steps.

FIG. 3 is an explanatory schematic view showing a cooling step.

FIG. 4 is an explanatory schematic view showing a pulverizing and sorting step.

FIG. 5 is a longitudinal sectional view of a crusher.

[Explanation of symbols]

 A Rolling process B Cutting process C Cooling process D Pulverizing process E Sorting process 1 Insulated wire 1A Metal wire 1B Coating material 1A'Cooled metal material 1B'Cooled coating material 1C Coating material powder 2 Rolling device 2A Rolling roller 2B Rolling roller 3 Plate 4 Cutting device 4A Cutter 4B Cutter 5 Strip 5A Cooled strip 6 Liquefied nitrogen 7 Cooling tank 8 Crusher 9 Case 9A Cylindrical part 9B Roto 9C Discharge port 11 Motor 12 Impeller 12A Upper disk 12B Blade 13 Center hole 14 Wire mesh 14A Mesh

Claims (1)

(57) [Claims] 1. A rolling step of rolling a coated electric wire into a continuous plate having a desired thickness, a cutting step of cutting the continuous plate in a width direction and cutting the strip into a strip, A cooling step of cooling the coating material to below the embrittlement point, a pulverizing step of pulverizing the coating material to separate the coating material from the metal pieces, and separating each of the metal pieces and the powder of the coating material through a sieve to collect the powder. A method for peeling a covering material from a covered electric wire, the method comprising sequentially passing through a step.