JPS5821689Y2 - Manufacturing equipment for hard vinyl pipes for protection of stand-up cables - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an apparatus for efficiently manufacturing a hard vinyl pipe for protecting a cable pulled out from underground at the rising part of a utility pole.

Conventionally, the hard vinyl pipe A used to protect CV cables and CVT cables at the rising part of utility poles has an arcuate cross section with one side of a cylinder cut away, as shown in Fig. 6. Bring B into close contact with the utility pole to cover the cable on the side of the utility pole, and at the same time lock the tightening band into the cutout hole C made in the hard vinyl pipe A, and then wrap the band around the utility pole to secure the tightening. It is used as.

Since the cutout B of the hard vinyl pipe A is formed by cutting, it is extremely time-consuming, and there are other problems such as difficulty in finishing the cutout B to a uniform width. From the point of view of effective use of materials, there were many drawbacks such as large losses.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide an apparatus for manufacturing a cylindrical body by simultaneously forming the cutout part in the process of forming the cylindrical body.

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

Generally, hard vinyl pipe manufacturing equipment includes an extruder equipped with a molding die that extrudes hard vinyl resin in a softened and molten state into a cylindrical shape, and a cooling tank that cools and solidifies the extruded resin pipe.
A device for taking up the cooled and solidified resin pipe and a cutting machine for cutting the resin pipe into predetermined lengths in the axial direction are connected in series and are configured to operate continuously using a motor as a driving source. There is.

FIG. 1 shows the main parts of the above-mentioned hard tube manufacturing apparatus, in which an extruder 1 softens and melts the molding material supplied from a hopper in a heating cylinder, extrudes it with a screw (none of which is shown), and a molding die 2. A large number of cooling water injection nozzles 4 are installed along the inner wall of the cooling tank 3.

The gist of the present invention is that a knife 5 is installed below the exit of the molding die for cutting one side of the resin tube in the axial direction immediately after extrusion, and the extruder is installed on the inlet side of the cooling tank 3. An inner cooling homer 7 is attached to a support shaft 11 that projects horizontally from the outlet side of the resin pipe 1.

The inner cooling former has a conical portion 7a whose diameter gradually increases in the direction of travel of the resin tube in order to widen the cut portion of the resin tube and form the resin tube into a desired cross-sectional arc shape. and a cylindrical portion 7b connected to the larger diameter side of the conical portion 7a.
is exposed to the outside of the inlet side tank of the cooling tank 3, and the cylindrical portion 7b is made to face the inside of the cooling tank 3.

Further, the inner surface cooling former 7 is provided with a water supply port 8 and a drain port 9 to circulate cooling water therein, so that the resin pipe can be cooled from the inner circumferential surface.

Reference numeral 10.10 denotes guide claws protruding approximately horizontally at symmetrical positions on both left and right sides of the lower outside of the inner cooling homer 7, and the guide claws support the edge of the cut portion of the resin pipe to prevent the resin pipe from turning on the inner surface. - Prevents twisting or deformation from sliding around the homeer 7.

On the other hand, on the outer wall 3a of the inlet of the cooling tank 3, an outer rubber seal former 6 is provided on the outer periphery of the inner cooling former 7 to prevent the resin pipe from floating up from the inner cooling former.
is installed.

Next, to explain the operation of the present invention, the vinyl chloride resin pellet or powder molding material supplied from the hopper of the extruder 1 is softened and melted in a heating cylinder, extruded by a screw, and passed through a molding die 2. It becomes a cylinder.

One side of the cylindrical body is cut in the axial direction by a knife 5 attached below the outlet of the die 2 in a heated uncured state, and then the cylindrical body is cut along the outer circumferential surface of the conical part 7a of the inner surface cooling former 7. The resin tube is gradually expanded in width, and when passing through the large diameter side of the conical portion 7a and the outer peripheral surface of the cylindrical portion 7b, the resin tube is formed into an arcuate cross-sectional shape with a desired dimension.

During this time, the inner peripheral surface of the resin pipe is gradually cooled and solidified by the cooling water circulating in the inner surface cooling former 7, and the outer peripheral surface is also By cooling, the resin tube is completely cooled and solidified.

The cylindrical body thus formed into a predetermined shape is taken up by a take-up device, and then cut into required dimensions by a cutting machine to manufacture the desired cable protection hard vinyl pipe A as shown in FIG. 6 with extremely high efficiency. I can do it.

As described above, the device of the present invention can easily tear a cylindrical body in an uncured state immediately after molding with a knife attached below the exit of the molding die, widen the torn part with an inner cooling former, and both the inner and outer surfaces The product is formed into the desired shape by uniformly cooling the cylinder, and the product can be made all at once through a series of cylindrical manufacturing processes, and all processes are continuous, resulting in extremely high productivity and uniform quality. Furthermore, there is no loss of material, and it is useful because it can eliminate the drawbacks of the conventional method.

[Brief explanation of drawings]

The figures relate to the present invention: Fig. 1 is a sectional view, Fig. 2 is a sectional view of the inner cooling homer, Fig. 3 is a sectional view of the cylindrical body cut with a knife, and Fig. 4 is the inner cooling FIG. 5 is a cross-sectional view of the cylindrical body guided into the conical part of the homer; FIG.
The figure is a perspective view of the molded product. 1... Extruder, 2... Molding die,
3...Cooling tank, 5...Knife, 6...
...Outer rubber seal homer, 7...Inner cooling homer, 7a...Curved conical portion, A...Hard vinyl pipe for protection of rising cable.

Claims (1)

[Scope of utility model registration request] An extruder equipped with a molding die that extrudes hard vinyl resin in a softened and molten state into a cylindrical shape, a cooling tank that cools and solidifies the extruded resin pipe, and a take-up device for the cooled and solidified resin pipe. In an apparatus for manufacturing a hard vinyl tube for protection of a rising cable, which is equipped with a cutting machine that cuts the resin tube into predetermined lengths in the axial direction, the resin tube immediately after being extruded is placed below the outlet of the molding die. A knife is attached to one side of the resin pipe in the axial direction, and a knife is attached to the inlet side of the cooling tank to widen the cut part of the resin pipe and form the resin pipe into a desired cross-sectional arc shape. An inner cooling former having a conical portion whose diameter gradually increases in the direction of travel of the resin pipe, and an outer rubber seal former located on the outer periphery of the inner cooling former to prevent the resin pipe from floating up from the inner cooling former. A manufacturing device for hard vinyl tubes for protection of rising cables, which is characterized by the fact that it is equipped with: