KR20060011627A - Unit pipe manufacturing equipment for plastic pipe with double wall - Google Patents

Abstract

The present invention relates to a unit pipe manufacturing apparatus for a synthetic pipe having a double wall.

The present invention is configured so that the synthetic resin granules are melted in a gel state by the heat generated from the hot wire of the molten portion, and the melted synthetic resin gel is compressed by a screw rotating inside the extrusion portion, and the nozzle is coupled to the tip of the extruded portion. In the unit pipe manufacturing apparatus for a synthetic pipe having a double wall configured to be extruded through the unit pipe, wherein the unit pipe is configured to be extruded to have a hollow rectangular cross section, the unit pipe is vacuum sizing, primary cooling It is configured to be cured sequentially while passing through the secondary and the secondary cooling portion, characterized in that configured to be withdrawn through the extraction guide.

Therefore, in the present invention, the molten synthetic resin is extruded to have a hollow rectangular shape through the extruded portion and then expanded outwardly by the vacuum force in the process of passing through the vacuum sizing portion and semi-cured by cooling to maintain the semi-finished product shape. The hardened product is hardened through the first vacuum cooling unit and the second vacuum cooling unit to obtain a unit pipe with almost no deformation.

Vacuum sizing, cooling unit, hardening, drawing guide, unit pipe

Description

Unit pipe manufacturing device for synthetic resin pipe having double wall {UNIT PIPE MAKING DEVIDE FOR A PLASTIC PIPE THAT HAVE DOUBLE WALL}

1 is a front view showing the configuration of a unit pipe manufacturing apparatus according to the present invention.

Figure 2 is a block diagram showing the configuration of a unit pipe manufacturing apparatus according to the present invention.

<Brief description of symbols for the main parts of the drawings>

1: melted part 2: extruded part

3: unit pipe 4: vacuum aging

5: 1st cooling part 6: 2nd cooling part

7: withdrawal guide 11: hot wire

21: screw 22: nozzle

The present invention relates to a unit pipe manufacturing apparatus for a double-walled synthetic resin pipe, in particular the molten synthetic resin is extruded to have a hollow rectangular shape through the extrusion portion and then expanded to the outside by a vacuum force in the process of passing through the vacuum sizing portion The semi-finished product is semi-cured by water cooling to maintain the form of the semi-finished product, and the semi-finished product is cured through the first vacuum cooling unit and the second vacuum cooling unit, thereby obtaining a unit pipe having almost no deformation of the appearance. It is.

In general, a pipe is generally used as a method for easily moving a fluid from one place to another, and such a pipe is divided into a metal pipe and a synthetic resin pipe according to the material of the pipe.

Here, the metal pipe is used where a constant pressure is applied to the inside of the metal pipe is configured to move quickly over a long distance by applying pressure to the fluid, the synthetic pipe has a strong advantage against corrosion compared to the metal pipe, Its strength is low so that it is easily damaged by external shocks, so it is used under a certain pressure. It is usually used in drainage pipes and sewer pipes in which pressure does not act on the fluid.

The synthetic resin pipe is obtained by rapidly cooling the synthetic resin melted in a liquid state to have a hollow shape through a nozzle and is formed to have a circular cross section having a predetermined thickness.

Such a synthetic resin pipe has a problem in that fluid is leaked as a crack occurs or breaks when a constant pressure or impact force is locally applied from the outside.

In addition, the noise generated during the passage of the fluid as it is delivered to the outside as a new noise pollution has emerged as the main culprit.

In order to solve this problem, a corrugated pipe in which the hollow reinforcing material is wound in a spiral shape has been proposed, but since the part connecting the hollow reinforcing material is provided in the form of irregularities, it is cumbersome at the time of laying work and is easily broken because it is not firm between them. Therefore, there was a problem that the leak occurs.

In order to solve such a problem, a spiral hollow part is continuously formed along the synthetic resin surface constituting the pipe through the "manufacturing method and apparatus for manufacturing a synthetic resin double wall smooth tube" of Korean Patent Registration No. 136249 (1998.1.21), A synthetic resin double wall smooth tube having a structure in which the hollow part is formed in the shape of an I-beam and the strength thereof is increased is proposed.

The proposed smooth tube is first injected into a hollow tube and then spirally wound the small tube, injecting a synthetic resin into the gap formed between the inside and the outside of the small tube, smoothing the inner and outer peripheral surfaces In addition, the synthetic resin injected to form an I-beam between the small pipes to be obtained by the step of mutually bonding the small pipes by pressing in the vertical direction.

However, as the synthetic resin of the resin reservoir moves along the guide and is cooled, in the process of manufacturing the hollow tube, the cross-sectional area is changed as the high-temperature synthetic resin in the liquid state does not cool sufficiently while moving along the guide. In the process of winding the rotating roller while being deformed and rotated at the same time, there was a problem that the deformation is brought more by the winding force, that is, the tension.

Due to this deformation, the synthetic resin is injected through the plastic injection nozzle between the small pipes wound on the rotating roller, and then compressed by the pressing roller to form an I-beam. In the process of unfolding, the synthetic resin unfolded on the inner side of the small tube is stuck to the rotating roller, which makes it impossible to move in the lateral direction, and at the same time, the new small tube is wound on the outside of the small tube, which cannot be moved to the next process. There was another issue of becoming.

In order to solve such a problem, through the "method and apparatus for manufacturing synthetic resin double wall pipe of the Republic of Korea Patent Registration No. 343957 (2002.6.27)" so that the hollow hollow portion continuously formed along the synthetic resin surface forming the pipe as in the prior art A double-walled smooth tube of synthetic resin has been proposed, which has a structure in which the hollow part is formed in the shape of an I-beam and its strength is increased.

The proposed smooth pipe is first manufactured by a small pipe having a predetermined diameter to be continuously supplied to the double wall pipe under construction through a guide roller, and the supplied small pipe is brought into close contact with the side of the double wall pipe under construction. The double wall tube and the small tube are fused to each other by applying heat to the joints, and the welded portion is pushed toward the double wall tube by the guide blades, and the fusion site is heated again with a heating part. Was smoothed and sprayed with water on the surface of the smoothed double wall pipe through a cooling nozzle.

However, such a smooth pipe is wound in a spiral shape on a rotating roller while the small pipe is cooled so as not to have sufficient strength, and then a liquid roller is injected through a plastic injection nozzle located between the small pipes. In the process of forming the I-beam by pressing, the problem that the double-walled pipe is not transported because the synthetic resin, which is spread on the inner surface of the synthetic resin, spread out inside and outside by the pressing force is stuck to the rotating roller, but has a predetermined diameter. In the process of heat fusion using a separate heating part to the part contacted to the side of the double wall tube being manufactured by the small pipe, the cross-sectional area of the fusion region becomes narrow and thin, which makes it difficult to achieve sufficient fusion. There was another problem that the fusion site was easily broken.

The present invention has been made to solve such problems, the melted synthetic resin is extruded to have a hollow rectangular shape through the extrusion portion and then expanded outward by the vacuum force in the process of passing through the vacuum sizing portion and at the same time semi-cured by cooling By maintaining the semifinished product shape having a rectangular cross section and hardening the semi-finished product through the first vacuum cooling part and the second vacuum cooling part, a double wall capable of obtaining a unit pipe with almost no deformation can be obtained. It is an object to provide a unit pipe manufacturing apparatus for a synthetic resin pipe having.

The present invention for achieving the above object is configured so that the synthetic resin granules are melted in a gel state by the heat generated from the hot wire of the molten portion, the molten synthetic resin gel is compressed by a screw rotating in the extrusion portion, the extrusion portion A unit pipe manufacturing apparatus for a synthetic resin pipe having a double wall configured to extrude a unit pipe through a nozzle coupled to a tip, wherein the unit pipe is configured to be extruded to have a hollow rectangular cross section, and the unit pipe is vacuumed. It provides a unit pipe manufacturing apparatus for a synthetic resin pipe having a double wall, characterized in that configured to be sequentially cured while passing through the sizing portion (4), the primary cooling portion and the secondary cooling portion, and to be drawn out through the extraction guide. To that purpose is achieved.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

Unit pipe manufacturing apparatus (A) according to the present invention, as shown in Figs. 1 to 3, the melting part 1, the extrusion part 2, the vacuum sizing part 4, the primary cooling part 5 And a second cooling unit 6 and a drawing guide 7.

Here, the melting part 1 has a function of converting or melting a synthetic resin granule in a solid form into a gel state suitable for extruding through the extrusion part 2, and a heating wire 11 provided inside the melting part 1. The synthetic resin granules, which are introduced into the hopper 12 by the high temperature heat generated from the melt, are gradually melted, and are configured to melt in a state of a complete gel in the process of moving to the extrusion unit 2.

The extruded part 2 has a function of extruding the synthetic resin gel melted through the melted part 1 to have a specific hollow shape, and is compressed at a constant pressure by a screw 21 rotating therein, and at the same time, the compressive force thereof. It is configured to extrude the unit pipe (3) which is a basic material required to manufacture a synthetic resin pipe having a double wall through the nozzle 22 coupled to the front end.

The unit pipe (3) is extruded to have a hollow shape with a rectangular inside, so that the side can be easily fused or bonded without a change in shape when manufacturing a double-walled synthetic resin pipe.

The vacuum sizing unit 4 has a shape different from that of the initial form of the unit pipe 3 extruded in a rectangular hollow form through the nozzle 22 of the extrusion unit 2 by atmospheric pressure, self-weight, or tensile force. It is configured to have a main function of semi-curing the surface of the unit pipe 3 so as to prevent the central part from sagging downward or both sides of the wall protruding outwardly or concave inwardly.

To this end, the vacuum sizing unit 4 is such that the inlet guide 41 on one side of the hollow tube body 43 having a predetermined length and the draw guide 42 on the other side to be kept airtight with a plurality of bolts 44. It is coupled so that the drawing guide 42 is coupled to the body 51 constituting the primary cooling unit 5 described later so that the semi-radiated unit pipe 3 can be continuously cooled.

In addition, in the inner space of the tubular body 43, a plurality of disks 45 having a square hole 451 formed at a center thereof are configured to maintain a constant interval, so that the unit pipe 3 passes through the inside of the square hole 451. ) Surface is in close contact with its inner surface and cooled in the form of an initial rectangular hollow extruded through the nozzle 22, so that deformation is prevented.

In addition, the cold water inlet 431 and the cold water outlet 432 are coupled to the outer periphery of the tubular body 43 so that cold water corresponding to about 70% of the total internal space is always supplied, thereby forming the disk 45. It is comprised so that the unit pipe 3 which passes through the square hole 451 can be cooled easily.

In addition, the water of which the temperature is increased by cooling the unit pipe 3 is discharged through the cold water outlet 432, so that the new cooling water is circulated to prevent the cooling rate due to overheating from being lowered.

On the other hand, the suction side of the vacuum pump 46 is configured so that the vacuum pressure is applied to the remaining 30% of the space except the 70% of the space filled with water inside the tubular body 43.

That is, when a vacuum pressure acts on the inside of the tubular body 43, atmospheric pressure acts on the inside of the unit pipe 3, so that the outside, which is the surface of the unit pipe 3, is extended to the outside. .

Therefore, since the unit pipe 3 passing through the square hole 451 of the disk 45 is first expanded while being extended outward, the initial shape can be maintained as it is.

The inflow guide 41 allows the unit pipe 3 extruded through the nozzle 22 of the extrusion unit 2 to easily flow into the square hole 451 formed in the disk 45 of the vacuum sizing unit 4. At the same time, the cross-sectional area is narrowed, and the temperature of the unit pipe 3 which is high temperature is partially lowered.

To this end, the inlet guide 41 is coupled to the inlet side of the tubular body 43, the disk plate 411 is formed with a first inlet hole 412 of the rectangular shape and the taper in front of the disk plate 411 The second inflow hole 413 of the square shape is configured to be coupled.

In addition, the second inlet hole 413 is configured to be coupled to the cooling water circulation port 414 having a shape surrounding the circumference thereof. That is, it is comprised so that the 2nd inflow hole 413 which has a tapered form inside the cooling water circulation port 414 is integrally formed.

The cooling water circulation port 414 is formed in a hollow shape having a predetermined thickness, and is configured to couple the connecting member 415 capable of flowing in and out of the cooling water to both sides thereof.

The first cooling unit 5 has a function of preventing the deformation by further hardening the semi-cured unit pipe 3 by passing the vacuum sizing unit 4 while narrowing its cross-sectional area and cooling to a constant temperature. Consists of.

To this end, the first cooling unit 5 is coupled to the cover 52 to be hermetically maintained on the upper portion of the body 51 having a housing shape, the nozzle 54 in the upper and lower inner portions of the body 51 The combined cooling water pipe 53 is configured to be installed in the longitudinal direction.

Therefore, the coolant is sprayed into the mist state through the nozzle to the surface of the unit pipe 3 to be primarily hardened and transported to further cool the unit pipe 3, thereby obtaining a semifinished product form.

In addition, the suction side of the vacuum pump 46 is coupled to the body 51 to prevent atmospheric pressure from acting on the unit pipe 3 that transfers the inside of the body 51. It is configured to be.

The second cooling unit 6 has the same function and configuration as the first cooling unit 5, and further hardens the unit pipe 3 cooled to a predetermined temperature through the first cooling unit 5. It is configured to take the form of a semifinished product.

The semi-finished product is not cooled to a temperature that is too low, but even if it is placed in the air, its shape does not cause deformation in the cross-section of the rectangular shape, so that a constant temperature is still maintained. It is connected to a separate take-off head to manufacture a spiral wound and the fusion rate can be increased in the process of fusion by injecting a high temperature synthetic resin solution therebetween.

The withdrawal guide 7 is cooled through the first and second primary cooling units 5 and 6 and the surface of the body 51 is scratched in the process of being drawn out of the body 51 in a semi-cured form. It has a function to prevent deformation due to friction, the horizontal roller 72 is coupled to the first bracket 71 to the end of the body 51 and the second bracket (both sides of the horizontal roller 72) 73, the plurality of vertical rollers 74, 74 'are configured to be coupled.

The method of manufacturing a unit pipe required for a synthetic resin pipe manufacturing process having a double wall using the unit pipe manufacturing apparatus as described above is as follows.

First, the synthetic resin granules are introduced into the hopper 12 and are gradually melted by heat generated from the heating wire 11 provided therein while entering a predetermined amount into the molten portion 1 coupled to the lower portion thereof. The synthetic resin granules, which begin to melt, that is in a semi-melt state, are melted and compressed into a complete gel state as they move toward the nozzle 22 coupled to the tip of the extrusion part 2 by the rotation of the screw 21.

Next, the synthetic resin gel melted and compressed in a gel state is extruded by the pressure into the unit pipe 3, which is a basic material having a rectangular hollow, through the nozzle at the tip end.

Next, the unit pipe 3 extruded through the nozzle 22 moves laterally in the state of high temperature, and the square of the disk 45 is passed through the inlet guide 41 coupled to the front of the vacuum sizing unit 4. It flows into the hole 451 and is conveyed.

At this time, the coolant constituting the outside of the second inlet hole 413 while narrowing the cross-sectional area of the unit pipe 3 due to the tapered square shape of the second inlet hole 413 coupled to the front of the disc plate 411. A certain amount of heat is cooled through the circulation port 414.

Next, the unit pipe 3 having the narrowed cross section is cooled by the coolant filled in the tube body 43 in the course of successively passing through the square hole 451 of the disk 45 and at the same time having a predetermined vacuum force. As it acts, it is brought into close contact with the inner circumference of the formed square hole 451 of the disk 45 and cooled and semi-cured in an initial square hollow form extruded through the nozzle 22, whereby the center portion of the upper portion is lowered. It prevents sagging or rounding outwards or deforming inwardly.

This is because the atmospheric pressure is applied to the inside of the unit pipe (3) while the vacuum pressure is applied to the inside of the tube body (43), which is the outside, the outside of the surface forming the unit pipe (3) is expanded to the outside. .

Therefore, since the unit pipe 3 passing through the square hole 451 of the disk 45 is first expanded while being extended outward, the initial shape can be maintained as it is.

Next, the unit pipe 3 which maintains its initial shape while passing through the vacuum sizing unit 4 is coupled to the coolant pipe 53 in the course of passing through the body 51 of the primary cooling unit 5. Cooling water is sprayed to the surface of the unit pipe 3 in the form of fog through the two nozzles 22, thereby continuously cooling the unit pipe 3 further.

Next, the unit pipe 3 cooled in the form of a semi-finished product in the course of passing through the first cooling section 5 is further cooled in the course of passing through the second cooling section 6, thereby making it less semi-finished product. Will have the form of.

Next, the unit pipe 3 hardened in the form of a semi-finished product is a horizontal roller 72 coupled to the first bracket 71 at the end of the body 51 and a second bracket 73 on both sides of the horizontal roller 72. By being pulled out between a plurality of vertical rollers 74 and 74 'coupled to each other, it is possible to obtain a high quality unit pipe 3 which is prevented from being scratched or deformed by friction.

The unit pipe 3 of such a high quality is not cooled so low that it will not be deformed in the rectangular cross section due to its own weight even if it is placed in the air. It can be connected to a separate take-off head not shown for manufacturing a synthetic resin pipe having a double wall spiral wound and the welding rate can be increased in the process of injecting a high temperature synthetic resin solution therebetween.

According to the present invention, the molten synthetic resin is extruded to have a hollow rectangular shape through the extruded part and then expanded to the outside by a vacuum force in the process of passing through the vacuum sizing part, and semi-finished by cooling to maintain a semi-finished product having a rectangular cross section. In addition, the semi-hardened product is hardened through the first vacuum cooling unit and the second vacuum cooling unit, thereby obtaining a unit pipe with almost no deformation.

Claims (5)

The synthetic resin granules are melted in a gel state by the heat generated from the heating wire 11 of the melting part 1, and the molten synthetic resin gel is compressed by the screw 21 rotating inside the extrusion part 2. In the unit pipe manufacturing apparatus for a synthetic resin pipe having a double wall configured to extrude the unit pipe (3) through the nozzle 22 coupled to the tip of the extrusion section 2, The unit pipe 3 is configured to be extruded to have a hollow rectangular cross section, the unit pipe 3 is a vacuum sizing unit 4, the primary cooling unit 5 and the secondary cooling unit ( Unit pipe manufacturing apparatus for a synthetic resin pipe having a double wall, characterized in that configured to be sequentially cured while passing through 6), and to be drawn out through the withdrawal guide (7). The method of claim 1, The vacuum sizing unit 4 is configured to be coupled with several bolts 44 so that the inflow guide 41 and the extraction guide 42 are hermetically maintained on both sides of the hollow tube body 43, and the tube A plurality of disks 45 having a square hole 451 formed in the inner space of the body 43 is configured to maintain a constant interval, the cold water inlet 431 and the cold water outlet 432 to the tube body 43 70% of the cold water is always supplied and circulated in the entire inner space, and the suction side of the vacuum pump 46 is coupled to the remaining 30% of the inner space so that the vacuum pressure is applied to the inner space of the disk 45. Unit pipe manufacturing apparatus for a synthetic resin pipe having a double wall, characterized in that the unit pipe (3) passing through the square hole (451) is configured to be primarily hardened while expanding outward. The method of claim 2, The inflow guide 41 is configured such that the tapered rectangular second inlet hole 413 is coupled to the front side of the disc plate 411 in which the first inlet hole 412 of the square shape is formed. Unit pipe manufacturing apparatus for a synthetic resin pipe having a double wall, characterized in that configured to be coupled to the cooling water circulation port 414 having a shape surrounding the 413. The method of claim 1, The primary cooling unit 5 is coupled so that the cover 52 is hermetically maintained on the upper portion of the body 51 having a housing shape, and the nozzles 54 are coupled to upper and lower parts of the body 51. Cooling water pipe 53 is installed in the longitudinal direction and is configured to have a semi-finished product by spraying the cooling water to the surface of the primary hardened unit pipe (3) to convey the inside, the vacuum pump 46 to the body 51 Unit pipe manufacturing apparatus for a synthetic resin pipe having a double wall, characterized in that the suction side of the) is coupled so that the vacuum pressure is applied. The method according to any one of claims 1 to 4, The withdrawal guide 7 includes a plurality of vertical rollers coupled to the end of the body 51 by the first bracket 71 and the second brackets 73 on both sides of the horizontal roller 72. Unit pipe manufacturing apparatus for a synthetic resin pipe having a double wall, characterized in that the roller (74) (74 ') is configured to be coupled.

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