KR200213965Y1 - manufacture device of spiral hollow pipe - Google Patents

Abstract

The present invention relates to a helical hollow tube manufacturing apparatus, and has a hollow small tube heating device for melting the outer peripheral surface of the upper part of the solid small hollow tube through the hollow small tube cooling device, the sub-extruder of the hollow small tube A primary supply pipe having a discharge hole for supplying a liquid resin to an upper end surface of a hollow small pipe which is separated between a lower portion of the main supply pipe and continuously supplied between the gaps and is provided with a discharge hole for supplying a liquid resin. Melt line for manufacturing with a three-way injection nozzle having a secondary supply pipe formed with a discharge port for supplying a liquid resin on the upper outer peripheral surface of the hollow small pipe separated from the lower part of the main supply pipe first wound on the drum Since the inner and outer surfaces are flat, socket connection is possible, and the surface of the hollow tube is not exposed to the outside and between the side walls of the hollow tube Lee narrowed to increase the amount tissue is compact and the structural strength is effective to prevent the separation between the molten resin and a hollow small tube by external stress from occurring.

Description

Manufacturing device of spiral hollow pipe

The present invention relates to a helical hollow tube manufacturing apparatus, and more particularly, the inner and outer surfaces of the spiral hollow tube manufacturing apparatus can be connected to the socket because the inner and outer surfaces are flat, and the surface of the hollow small tube is not exposed to the outside and hollow small The present invention relates to a device for manufacturing a spiral hollow tube, which has a narrow structure and a high structural strength, and can prevent separation between the molten resin and the hollow small tube due to external deformation.

In general, in the case of laying underground pipes for sewerage and electric wires, pipes made of synthetic resins (PE), which are light in weight, convenient in operation, and have high durability compared to cement pipes, are mainly used.

Factors affecting the strength of the tube include the structure of the tube, the structural material forming the tube, and the thermal properties of the bonds or structural materials that appear when plastically deforming the structural material during manufacturing. Variables affecting the strength of the tube appear in the structure of the tube, the selected structural material, the manufacturing process and apparatus of the tube.

However, it is difficult to reflect all of these factors and variables in the design and manufacture of the tube, and the material of the tube is selected and manufactured to the extent that the mechanical strength is maintained when the structural design is used or the manufacturing process suitable for the predetermined structural material is used. .

The known pipe manufacturing technique using synthetic resin as a structural material is to manufacture a tube through a process such as extrusion-molding-cooling-drawing-cutting, etc., and the cross-sectional shape of the tube made by this method is formed of a solid layer. It is generally used for the manufacture of sewage pipes, conduits and the like.

In the manufacture of spiral hollow pipes made of synthetic resin (PE), the key is how to reduce the amount of material used while maintaining the stiffness to withstand earth pressure and lubrication pressure when buried in the ground. BACKGROUND OF THE INVENTION It is known to form a small hollow tube by first extruding it and winding it around a drum to form a spiral hollow tube having a smooth inside and out shape. The shape of the hole of the small pipe is determined by the extrusion die, and various hollow holes can be manufactured.

Figure 4 is a schematic cross-sectional view showing a conventional manufacturing apparatus, Figure 5 is a schematic side cross-sectional view showing a conventional manufacturing apparatus, Figure 6 is a side cross-sectional view to enlarge the main portion of the tube manufactured according to the conventional manufacturing apparatus, 7 is a side cross-sectional view of an enlarged main portion of a tube manufactured differently according to a conventional manufacturing apparatus, wherein the synthetic resin is continuously extruded and molded into a hollow small tube 90 'having a rectangular cross section by the first extrusion device 80a. The molded hollow tube 90 'is transferred to a plurality of rotary rollers 62 arranged at regular intervals along the circumferential direction at the outer diameter portion of the circular drum 60, and wound continuously in a spiral shape along the outer circumferential surface thereof. At the same time, a spiral hollow tube 1 'in close contact with the adjacent small tube 90' was formed.

The plurality of rotary rollers 62 are rotated at the same speed as the speed at which the hollow compact pipe 90 'is extruded by the drive motor 100, and the second rotary roller 62 is rotated from the second extrusion device 80b and the third extrusion device 80c. The heterogeneous molten resin (E) to be supplied is supplied to the inside and the outside of the contact portion of the hollow small pipe (90 ') through the respective discharge ports (120', 120 ') of the injection nozzle (120) and simultaneously heated. The opposite surface of the injection nozzle 120 was melted by contacting the side of the hollow small tube 90 'pre-wound and the opposite side of the hollow small tube 90' supplied adjacent thereto.

Continuously supplied hollow small tube 90 'having opposite sides melted is welded to the molten side surface while pressure is applied to the hollow small tube 90' pre-wound by the guide roller 50. And the molten resin E supplied through the upper and lower discharge ports 120 'and 120' of the injection nozzle 120 is supplied to the inner and outer gaps between the adjacent hollow small pipes 90 'and pressed into the compression roller 40. The pressure was applied by 42) to densely fill the gap and to flatten the inner and outer surfaces.

The molten resin E supplied through the upper discharge port 120 ′ is supplied with a much larger amount than the amount that can fill the outer gap so that the remaining molten resin E fills the gap to the pressure rollers 40 and 42. As a result, the reinforcement layer 92 'having a flat surface was formed to be widened side by side, and cooled by the cooling water 112 of the cooling tank 110 to form a spiral hollow tube 1' having an inner and outer surface flat.

However, such a conventional apparatus is provided on the outer surface of the hollow small tube 90 'as shown in FIG. 6 when a small amount of the molten resin E is supplied through the discharge holes 120' and 120 'of the injection nozzle 120. The melt line is formed on the surface of the hollow tube 90 ', which is exposed to the outside, which causes defects that are easily deformed or damaged by load when buried in the ground, and also by direct sunlight during storage. As a result of exposure and aging, commodity value decreased and structural strength also decreased.

In addition, when a large amount of the molten resin E is supplied through the discharge holes 120 'and 120' of the injection nozzle 120, the flat reinforcement layer 92 'is flat on the upper and lower portions of the hollow small pipe 90' as shown in FIG. ) Is formed and looks structurally stable, but the distance d between the side walls of the hollow small tube 90 'is approximately 10 mm, so the distance between the side walls is not dense and the strength decreases, so that a deformation force such as torsion stress is applied from the outside. In addition to the change in the layered structure, the strength may be weakened, and the molten resin (E) flowing into the upper and lower surfaces of the outer circumferential surface of the hollow compact tube 90 'having a solid surface may be a hollow compact tube (90). ') And the resin was easily separated from the hollow small tube (90') by the external deformation force to weaken the structural strength.

The present invention is to solve the problems as described above, the present invention has no melt line in the manufacture of the spiral hollow tube can be connected to the socket because the inner and outer surface is flat, the surface of the hollow small tube is not exposed to the outside and the hollow small It is an object of the present invention to provide a spiral hollow tube manufacturing apparatus capable of preventing the separation between the molten resin and the hollow-type small tube due to the external structure, because the distance between the tube sidewalls is narrow and the structure is high.

In order to achieve the above object, the apparatus of the present invention is an extruder for making a hollow small tube, and an expansion type small tube cooling device for partially solidifying the hollow small tube in order to continuously supply the hollow small tube through the extruder; And a guide roller that presses and rotates the continuous continuous small hollow tube, and presses the continuous small continuous tube to the hollow small tube wound on the drum. In the helical hollow tube manufacturing apparatus comprising a sub-extruder for supplying a liquid resin between the gap of the hollow small tube and a compression roller for pressing the synthetic resin injected into the gap of the hollow small tube from the inside and outside sides,

It has a hollow small tube heating device that melts the upper outer peripheral surface of the partially solidified hollow small tube through the hollow small tube cooling device,

The sub-extruder has a main supply pipe with a discharge port for supplying a liquid resin located between the gaps of the hollow small pipe, and supplies liquid resin to the upper surface of the hollow small pipe which is separated from the lower part of the main supply pipe and continuously supplied. It has a primary supply pipe with a discharge port, characterized in that it comprises a three-way injection nozzle having a secondary supply pipe formed with a discharge port for supplying a liquid resin on the upper outer peripheral surface of the hollow small pipe separated from the lower portion of the main supply pipe first wound on the drum There is this.

1 is a schematic cross-sectional view showing a manufacturing apparatus of the present invention,

Figure 2 is a schematic side cross-sectional view showing a manufacturing apparatus of the present invention,

Figure 3 is an enlarged side cross-sectional view of the main portion of the tube manufactured according to the manufacturing apparatus of the present invention,

4 is a schematic cross-sectional view showing a conventional manufacturing apparatus,

5 is a schematic side cross-sectional view showing a conventional manufacturing apparatus,

Figure 6 is an enlarged side cross-sectional view of the main portion of the tube manufactured according to the conventional manufacturing apparatus,

Figure 7 is an enlarged side cross-sectional view of the main portion of the tube manufactured differently according to the conventional manufacturing apparatus.

* Description of the symbols for the main parts of the drawings *

1, 1 ': spiral hollow tube 10: three-way injection nozzle

11: secondary supply pipe 12, 14, 16: discharge port

13: primary supply pipe 15: main supply pipe

20: auxiliary extruder 30: hollow small tube heating apparatus

40, 42: compression roller 50: guide roller

60: drum 62: rotary roller

70: hollow small tube cooling device 80: extruder

90: hollow small tube 92: inner wall

94 side wall 96 outer wall

100: drive motor 110 cooling tank

112: cooling water A: thickness of the hollow inner wall

B: thickness of hollow small pipe side wall

C: thickness of outer wall of hollow type small pipe

D, d: Distance between side walls of small pipe a: Primary supply molten resin

b: gap feed molten resin c: secondary feed molten resin

Hereinafter, the present invention in more detail by the accompanying drawings as follows.

1 is a schematic cross-sectional view showing a manufacturing apparatus of the present invention, Figure 2 is a schematic side cross-sectional view showing a manufacturing apparatus of the present invention, Figure 3 is an enlarged side of the main portion of the tube manufactured according to the manufacturing apparatus of the present invention In cross-sectional view, the three-way injection nozzle 10 is to auxiliary supply the molten resin to the hollow small tube (90), the upper end is coupled to the auxiliary extruder 20 and the lower end 2 to the left and right around the main supply pipe (15) The primary supply pipe 11 and the primary supply pipe 13 is formed.

The discharge port 14 is formed at the lower end of the primary supply pipe 13, the discharge hole 16 is formed at the lower end of the main supply pipe 15, and the discharge hole 12 is formed at the lower end of the secondary supply pipe 11.

The hollow compact tube heating device 30 is supplied with molten resin (PE) through the hollow compact tube cooling device 70 to the extruder 80 to the rotary roller 62 of the rotary drum 60 continuously. As it is positioned, the hollow small tube (90) passes through the hollow small tube cooling device (70) to melt the outer wall (96) of the partially solidified hollow small tube (90) to the extent that the continuous supply does not interfere. .

At this time, the hollow small tube heating apparatus 30 may be configured to separately melt the left and right side walls 94 in addition to the outer wall 96 of the hollow small tube 90 supplied to the rotary roller 62 as needed. .

The primary supply pipe 13, the main supply pipe 15, and the secondary supply pipe of the hollow compact pipe 90 and the three-way injection nozzle 10 first extruded into the hollow compact pipe 90 in which the outer wall 96 is melted. The primary supply molten resin (a), the gap supply molten resin (b) and the primary supply molten resin (c) supplied through (11) are closely welded to each other.

By the extruder 80, the synthetic resin PE is a hollow small tube having a rectangular cross-sectional shape formed of an inner wall 92 having a thickness A, a left and right side wall 94 having a thickness B, and an outer wall 96 having a thickness C ( 90), which is partially solidified by the hollow small tube heater 30 so that the molten synthetic resin is continuously extruded and molded in a rectangular cross-sectional shape.

The hollow compact tube 90 formed as described above is extruded and solidified through the hollow compact tube heater 30 before being transferred to the rotary roller 62 of the circular drum 60. Only the outer wall 96 among the left and right walls 94 and the inner and outer walls 92 and 96 is melted to the extent that it can be continuously extruded.

In some cases, the left and right walls 94 should be melted.

The hollow small tube 90 in which the left and right end surfaces and the upper end surface are melted is transferred to a plurality of rotary rollers 62 arranged at regular intervals along the circumferential direction at the outer diameter portion of the circular drum 60 and the outer peripheral surface thereof. The spirally wound tube 1 is in close contact with the adjacent small tube 90 while being spirally wound along it.

The plurality of rotary rollers 62 rotates at the same speed as the speed at which the hollow compact tube 90 is extruded by the drive motor 100 and is a heterogeneous molten resin supplied from the sub-extruder 20. The primary supply molten resin (a), the gap supply molten resin (b), the secondary supply molten resin (c) are discharge ports 14 of the primary supply pipe 13 of the three-way injection nozzle 10, and the main supply pipe ( The gap between the discharge port 16 of the 15 and the outer wall 96 upper surface of the hollow small tube 90 that has already been molten through the discharge port 12 of the secondary supply pipe 11, and the left and right side walls 94, 1 The primary supply molten resin (a) is supplied by the primary supply pipe (13) and is respectively supplied to the upper surface of the already coated surface.

The molten resin supplied through the discharge port 12 of the secondary supply pipe 11 forms a reinforcing layer already formed through the primary supply pipe 13 and the main supply pipe 13 and the gap supply molten resin. The secondary feed molten resin (c) is supplied and welded to the outer upper surface of (b).

The hollow small pipe 90 in which the opposite side wall 94 and the outer wall 96 are melted while being continuously supplied is pressurized to the hollow small pipe 90 wound by the guide roller 50 to the side ( 94) A mutual welding is achieved.

At this time, the distance (D) between the side wall 94 of the hollow small tube (90) is approximately 7mm, the distance is narrowed, the tissue becomes dense.

When the hollow compact tube 90 is the thickness A of the inner wall 92 during extrusion and molding by the extruder 80, the thickness B of the side wall 94 is about B / 2, and the outer wall 96 ), Thickness (C) is also about B / 2.

Thus, the hollow tube 90 having a side wall 94 thickness B of about half of the thickness of the inner wall 92 has a gap supplied between the side wall (9 $) and both side walls (94) during molding. The supply molten resin (b) constitutes a dense structure, which further increases the external pressure strength of the hollow small tube (90).

Primary supply molten resin (a), the gap supply molten resin (b), and the secondary supply molten resin (c), which are molten resins supplied through the outlets 12, 14, and 16 of the three-way injection nozzle (10). ) Is supplied to the gap between the side wall 94 between the adjacent hollow small tube 90 and the upper surface of the outer wall 96 and is densely filled in the gap by being pressurized by the compression rollers 40 and 42. The inner and outer surfaces of the hollow small tube 90 are formed flat.

The gap supply molten resin (b) supplied through the main supply pipe (15) of the three-way injection nozzle (10) is supplied with a little more than the amount that can fill the outer gap to fill the gap between the side wall 94, the remaining gap The supply molten resin (b) is widened laterally by the pressure rollers (40) and (42) together with the primary supply molten resin (a) supplied through the primary supply pipe (13) to form a reinforcing layer having a flat surface, and an upper surface thereof. The secondary supply molten resin (c) is supplied through the secondary supply pipe (11) to be cooled by the cooling water 112 of the cooling tank 110, so that the inner and outer surfaces are flat and the structure is dense, so the structural strength is excellent and the wear resistance is high. The spiral hollow tube 1 which raised the shape is formed.

The spiral hollow tube manufactured using the device of the present invention has a uniform shape and a flat inner and outer surface, so that a socket connection such as a rubber ring can be made, and the side wall thickness of the hollow small tube can be reduced, resulting in a dense structure. The wear resistance is increased, the external pressure strength can be further improved, and the separation between the molten resin and the hollow small tube due to the external deformation force can be prevented in advance.

Claims (1)

Extruder 80 for making hollow small tube 90, and for increasing the compact small tube 90 to solidify hollow small tube 90 in order to continuously supply hollow small tube 90 through extruder 80 The apparatus 70, the drum 60 which winds up the continuous continuous hollow tube 90, and the hollow tube 90 which supplies the continuous continuous hollow tube 90 are wound around the drum 60 first. And guide rollers (50) to press close to the side. Auxiliary extruder (20) for supplying a liquid resin between the gap between the hollow small tube (90) and the compression roller (40, 42) for compressing the synthetic resin injected into the gap between the hollow small tube (90) In the spiral hollow tube manufacturing apparatus made; It has a hollow small tube heating device 30 for melting the upper outer peripheral surface of the partially solidified hollow small tube 90 via the hollow small tube cooling device 70, The sub-extruder 20 has a main supply pipe 15 which is located between the gaps of the hollow small pipe 90 and has a discharge port 16 for supplying a liquid resin, and is separated from the lower part of the main supply pipe 15 to be continuous. It has a primary supply pipe 13 formed with a discharge port 14 for supplying a liquid resin on the upper surface of the hollow small pipe 90 to be supplied, separated from the lower portion of the main supply pipe 15 to the drum 60 Spiral hollow tube manufacturing, characterized in that it comprises a three-way injection nozzle (10) having a secondary supply pipe (11) formed with a discharge port (12) for supplying a liquid resin on the upper outer peripheral surface of the hollow small tube (90) wound first Device.