JP3411723B2 - Separation disposal method of synthetic resin cladding tube and its treatment device - 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 for separating and discarding synthetic resin-coated pipes for treating defective products generated in the process of manufacturing synthetic resin-coated pipes, and a treatment apparatus therefor.

[0002]

2. Description of the Related Art Conventionally, as a method for treating defective products generated in the process of manufacturing a synthetic resin-coated pipe, a method has been known in which the synthetic resin-coated layer is cut with a knife, the synthetic resin layer and the metal pipe are separated and discarded.

[0003]

However, the above-mentioned method is a heavy labor since it is done manually, and it is also a safety problem, and the volume of the metal tube is large even after separating the synthetic resin layer and the metal tube. Therefore, there is a problem that a lot of disposal place and disposal cost are required.

Therefore, the present invention solves the above problems and provides a method and apparatus for peeling the synthetic resin coating of the synthetic resin coating tube and crushing the metal tube.

[0005]

In order to achieve the above object, the present invention has the following constitution. That is, the method of separating and discarding a synthetic resin-coated pipe according to the present invention is such that a synthetic resin-coated pipe in which a metal pipe is coated with a synthetic resin is crushed into a corrugated shape by a pair of upper and lower gear type gear rolls, and then the corrugated synthetic resin coating is applied. The pipe is flattened with a pair of upper and lower smooth rolls, and then the flattened synthetic resin coating layer of the synthetic resin coating layer is slit with a pair of peeling rolls in which at least one of the upper and lower sides serves as a blade. It features peeling off the tube coating and crushing the metal tube.

Further, according to the present invention, there is provided an apparatus for separating and discarding synthetic resin coated pipes, wherein a pair of upper and lower gear type gear rolls for crushing a synthetic resin coated pipe in which a synthetic resin is coated on a metal pipe is corrugated, and a corrugated synthetic resin. It has a pair of upper and lower smooth rolls with a smooth surface for flattening the cladding tube, and a pair of peeling rolls for slitting the synthetic resin coating layer of the flattened synthetic resin coating tube, at least one of which is a blade. Is featured.

According to the above construction, since the gear type gear roll is used for crushing the synthetic resin coating pipe, even if the synthetic resin coating pipe is bent into L type, U type, bow type or the like, it is the same as the straight pipe. Can be crushed into a wavy shape. The corrugated crushed synthetic resin coating tube is made into a substantially flat plate shape by the smooth roll, the volume is reduced and the surface becomes smooth, so the synthetic resin coating layer of the peeling roll synthetic resin coating tube The slit is easily formed, and the synthetic resin coating layer and the metal tube are automatically separated, and the volume of the metal tube can be reduced to reduce the disposal place and disposal cost.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a method and apparatus for removing coating of a synthetic resin-coated pipe according to the present invention will be specifically described below with reference to the drawings. FIG. 1 is a front view showing an example of an embodiment of a method and apparatus for removing a coating of a synthetic resin-coated tube according to the present invention, and FIG. 2 is an enlarged view showing a gear roll portion of FIG.

Reference numeral 1 designates a synthetic resin coated tube treated in the present invention. In this example, the synthetic resin coating tube 1 is L-shaped and is inserted into the gear type gear roll 2 at the left end of FIG. The gear type gear roll 2 has a pair of upper and lower rolls 21 on the surface of which the same number of tooth molds 22 of the same module are formed.
The tooth mold 22 of the upper and lower rolls 21 is configured by
The concave portion 23 and the convex portion 24 are configured so that the 1/2 phase of the gear pitch is vertically shifted. The pair of upper and lower rolls 21 are appropriately set so that the axial distance is larger than the reference pitch circle diameter and smaller than the tip circle diameter, and the upper and lower rolls 21 are driven so as to rotate at the same speed. The synthetic resin coating tube 1 is sandwiched between the concave portions 23 and the convex portions 24 of the upper and lower tooth molds 22, pressed and crushed to be formed into a corrugated shape, and the L-shaped bend is corrected and straightened. The synthetic resin-coated pipe 1 is usually a steel pipe coated with polyvinyl chloride resin or polyethylene, but the metal pipe may be another metal pipe such as an aluminum alloy pipe, or the coated resin may be other. The thermoplastic resin or the thermosetting resin may be used, and the shape thereof is not limited to the straight pipe but may be a U-shaped curved pipe as well as the L-shaped. As the roll 21 which constitutes the gear roll 2, a heat-treated special steel having a hardness higher than that of the metal pipe of the synthetic resin coating pipe 1 which is usually treated is used. Further, the tooth profile 21 formed on the roll 21 is usually an involute tooth profile, but another tooth profile may be appropriately used.

It is pressed by the gear roll 2 and L
The synthetic resin-coated pipe 1 which is straightened by straightening the bending of the mold is further crushed by a smooth roll 3 and molded into a flat plate shape. The coating layer is fed into the roll blade 4 in a state where it can be easily peeled off. The upper and lower rolls 31 constituting the smooth roll 3 are made of heat-treated special steel having a hardness higher than that of the metal pipe of the synthetic resin-coated pipe 1 which is usually processed, like the gear roll. The circumferential surface is usually a smooth surface, but irregularities such as knurls may be formed on the circumferential surface to prevent slippage.
The upper and lower rolls 31 are installed at appropriate axial intervals according to the thickness of the synthetic resin coated tube 1 to be processed, and are driven so that the upper and lower rolls move at the same speed.

The peeling roll pair 4 comprises a pair of upper and lower roll blades 41 or a pair of upper and lower roll blades 41 or a flat roll 42 facing either one of the upper and lower roll blades 41, and the upper roll blade 41 or the flat roll 42 is a spring. 44
It is pressed downward with an appropriate pressure by the above. All the upper and lower rolls forming the peeling roll pair 4 are non-driving and rotate by the pressure pushed by the smoothing roll 3, but the upper and lower rolls may be driven according to the feeding speed of the synthetic resin coating tube 1. In addition, the circumferential blade 4 is provided on the circumferential surface of the roll blade 41.
3 is formed. The synthetic resin coating tube 1 molded into a flat plate shape by the smooth roll 3 is pushed by the smooth roll 3 between the upper and lower roll blades 41 of the peeling roll pair 4 or between the roll blade 41 and the flat roll 42. Four
3, the synthetic resin coating layer 11 on the surface is slit and peeled from the metal pipe.

The pinch roll 5 is made of heat-treated special steel having a hardness higher than that of the metal pipe of the synthetic resin-coated pipe 1 which is usually treated like the smooth roll. The circumferential surface is usually a smooth surface, but slits or knurls may be formed on the circumferential surface to prevent slippage. The upper and lower rolls 51 are installed at appropriate axial intervals according to the thickness of the synthetic resin coating tube 1 to be processed, and are driven so that the upper and lower rolls move at the same speed. The metal tube 12 formed into a flat plate by peeling off the synthetic resin coating layer 11 is further crushed by the pinch rolls 5 and discharged from the apparatus.

[0013]

As described in detail above, the method for separating and discarding synthetic resin-coated pipes according to the present invention and the processing apparatus thereof automatically insert the synthetic resin-coated pipes into the apparatus to automatically remove the synthetic resin layer from the metal pipe. Since it can be peeled off and the metal tube can be crushed and molded into a flat plate shape, the work is easy and safe, and the disposal place and disposal cost are low. Further, since the synthetic resin coating pipe to be discarded is crushed into a corrugated shape by the gear type gear roll, straight pipes as well as curved pipes such as L type and U type can be easily treated.

[Brief description of drawings]

FIG. 1 is a front view of a sorting and discarding device for synthetic resin coated pipes according to the present invention.

FIG. 2 is an enlarged view of the gear type gear roll portion of FIG.

FIG. 3 is a cross-sectional view of a synthetic resin coated tube.

FIG. 4 is a cross-sectional view showing an example of an embodiment of a peeling roll pair.

FIG. 5 is a cross-sectional view showing an example of another embodiment of a peeling roll pair.

[Explanation of symbols]

1 Synthetic resin coating tube 11 Synthetic resin coating layer 12 metal tubes 2 gear type gear roll 21 rolls 22 teeth 23 recess 24 convex 3 smooth roll 31 rolls 4 Peeling roll pair 41 roll blade 42 flat roll 43 Circumferential blade 44 spring 5 pinch rolls 51 rolls

Claims (2)

(57) [Claims] 1. A synthetic resin-coated tube obtained by coating a metal tube with a synthetic resin is crushed into a corrugated shape by a pair of upper and lower gear-type gear rolls, and then the corrugated synthetic resin-coated tube is paired with upper and lower smooth smooth surfaces. The feature is that the coating of the synthetic resin coated pipe is peeled by slitting the synthetic resin coating layer of the flattened synthetic resin coated pipe with a pair of peeling rolls in which at least one of the upper and lower sides is a blade. Method for separating and disposing of synthetic resin coated pipes. 2. A pair of upper and lower gear type gear rolls for crushing a synthetic resin coated tube in which a synthetic resin is coated on a metal tube into a corrugated shape, and a pair of upper and lower smooth surfaces for flattening the corrugated synthetic resin coated tube. An apparatus for separating and disposing of synthetic resin-coated pipes, comprising: a roll; and a pair of peeling rolls, at least one of which is a knife for slitting a synthetic resin-coated layer of a flattened synthetic resin-coated pipe is a blade.