KR100458324B1 - Manufacturing method for double wall corrugated pipe having socket as one body - Google Patents

Abstract

The present invention is to provide a method for producing a corrugated double wall pipe having an integrated socket capable of mass production by forming a socket such as a pipe in a double wall pipe body so as to simplify the assembly construction such as pipe connection.

In the method for manufacturing a corrugated double wall pipe having an integrated socket of the present invention, a plurality of through-type slits 102 are formed by drilling a socket end portion 100'b of the corrugated double wall tube basic tube 100 ', and a socket end portion (100'b) is heated to a suitable time by heating with a high temperature heating agent to be flexible enough to be expanded, the socket end portion (100'b) mold acid 200a, mold taper surface 200b corresponding to the expansion dimension, shape ), The mold bone (200c), the tapered expansion mold portion (200d) and the ring-shaped guide plate 290 including a ring-shaped guide plate 290 and disposed inside the mold (210, 220), the socket end portion (100) When the rubber tube 232 of the volume expansion device 230 is inserted into the inside of 'b) and expanded to a finite volume and diameter by using air pressure, the mold of expansion coalescing and powder molds 210 and 220 is expanded. The main pipe 200a, the mold taper surface 200b, and the mold bone 200c are expanded in correspondence with each other. The socket portion 120 is maintained intact outside shape is formed.

Description

MANUFACTURING METHOD FOR DOUBLE WALL CORRUGATED PIPE HAVING SOCKET AS ONE BODY

The present invention relates to a method for manufacturing a corrugated double wall pipe having an integrated socket. More particularly, the present invention relates to a double wall pipe, a colgate tube, and a corrode for discharging living sewage, rainwater, and industrially treated industrial wastewater into a collection basin or river. The present invention relates to a manufacturing method capable of mass-producing a corrugated double wall tube having a high rigidity integrated socket such as a gate tube, a corrugated tube, and a DC (double wall corrugated) tube.

Generally, corrugated double wall pipes are flexible sewage pipes, water collecting pipes, and drainage pipes formed of synthetic resin materials such as polyethylene (PE), polycarbonate (PC), ABS (Acrylonitrile Butadiene Styrene), and PVC (PolyVinyl Chloride). It is used as a home line and a collecting pipe line in construction, and it has a double tube shape in which reinforcing ribs of equal intervals are formed integrally on the outer surface.

This corrugated double wall pipe is manufactured by extrusion molding the above-mentioned synthetic resin material, and the installation process is simple, so the construction is quick and easy in a narrow place, and the construction cost is possible regardless of soil, season, moisture, moisture, etc. It is advantageous for saving and air shortening. It is strong in chemical resistance and light in weight, so it is easy to handle.

This corrugated double wall pipe is a pipe member that is superior in rigidity and durability compared to a spiral pipe having the same external form.

In other words, the spiral tube is made of PE, PET (Poly Ethylene Terephthalate), which has good heat-forming processing, and has a hollow trapezoidal cross-section during extrusion and extends in the longitudinal direction while overlapping each side in the spiral direction. As a result, it has a double wall tube shape that is continuous in the spiral direction and corrugated in a spiral ring shape.

However, the spiral tube has the disadvantage of low external pressure strength and lack of elasticity when buried in the ground, and the product quality is deteriorated due to slip or loosening caused by long-term vibration, external force, load, and aging.

In contrast, the corrugated double wall pipe is a tube made by simultaneously extruding and molding the inner skin and the outer skin by blending a predetermined ratio of impact resistant agents and additives to a synthetic resin material such as PVC.

The corrugated double walled pipe has a plurality of O-ring shapes in which the outer shell protrudes in the circumferential direction and has a pitch interval in the longitudinal direction of the pipe, so that cutting and cutting are easy and there is no slip phenomenon or loosening phenomenon.

In particular, corrugated double wall pipes have relatively higher external pressure strength and compressive load than other synthetic pipe members.

For example, in the case of a product having a diameter of 100 to 300 mm, the external pressure strength is 10 to 13 kgf / cm 2, and the compressive load is 1540 to 1950 kgf / m.

In addition, the corrugated double wall pipe deforms when a load above the reference value is applied, but has excellent restoring force when removing the load, and has excellent manhole bonding property by mortar bonding and auxiliary pipe fabrication.

In addition, since the corrugated double wall pipe is joined to the socket or the joint pipe through a rubber seal dedicated for pipe connection, pipe connection and workability are easy, and even when the relative angle of the connection part is deformed up to about 15 °, the pipe connection Dedicated rubber packing covers it and has watertightness to withstand 3 to 5 kg of internal pressure.

As shown in FIG. 1, the corrugated double wall tube according to the prior art is a body 1 having various specifications and materials (materials) of 10 cm in diameter to 60 cm in diameter and usually about 6 m in length. Have 3).

The method of manufacturing a corrugated double wall pipe will be briefly described through the manufacturing apparatus as follows.

Here, the schematic configuration of the corrugated double wall pipe manufacturing apparatus is as follows.

-Extruder: It is a conventional pipe making extrusion equipment that melts synthetic resin material (compound) for corrugated double wall pipe and supplies soluble material for extrusion to an extruder die.

-Extruder die: A device for supplying a fusible material for extrusion by piping to the outlet side of the extruder, and for supplying the fusible material for extrusion to the first nozzle for outer skin and the second nozzle for inner skin, respectively.

-Cylindrical cooler: It is a device that cures the extruder dies by forming extruded soluble materials extruded from the first nozzle for the outer shell and the second nozzle for the inner shell in a circular shape, and the size corresponds to the inner diameter of the corrugated double wall pipe product. It has a diameter, and a cooling water supply line is arranged therein, and serves to cool the soluble material for extrusion.

-1st nozzle for outer shell, air nozzle, 2nd nozzle for inner shell: arranged in sequence between extruder die and cylindrical cooler so that extruded fusible material is extruded or air is supplied from external air supply to blow out air Maintain spaced distances. Here, the nozzle angle of the first nozzle is the largest, about 45 ° to 90 °, the nozzle angle of the air nozzle is medium, and the nozzle angle of the second nozzle is the surface of the cylindrical cooler, and the material extruded from the second nozzle is almost It has an angle of close contact.

-Caterpillar filter mold apparatus: having a predetermined structure and a power transmission device in which a plurality of molds are arranged above and below the first nozzle, the air nozzle, and the second nozzle.

-Corrugated pipe cutting device: A corrugated double wall pipe product having a double wall pipe tube shape is cut by a predetermined length (for example, 6 m) through a cater filter mold device.

-Corrugated tube support structure: guides or axially supports the cut corrugated tube cut by using a plurality of rollers.

In particular, the molds constituting a plurality of sets in the cater filter mold apparatus are coupled to a pair of endless chains arranged at upper and lower portions in a direction perpendicular to the ground with respect to the axis of the tube. By this endless chain, a plurality of molds are opened up and down at the initial position of the corrugated double wall tube tube, and then move to the axial center proportionally, and the molds facing each other are combined and merged. After horizontally shifting the intermediate position for fusion and stabilizing the inner skin 2 and the outer skin 3, the powder is spread while spreading up and down again in the late position, and the plurality of mold combinations thus powdered are returned to the initial position as infinitely orbital. The thin repetitive operation is performed continuously, except in the case of power shutdown, sudden stop, or failure.

Meanwhile, the soluble material for extrusion is extruded radially from the first nozzle and the second nozzle, and at the same time, the air is ejected from the air nozzle between the first nozzle and the second nozzle.

In this case, by the aforementioned nozzle angle, the air separates the materials extruded from the first nozzle and the second nozzle from each other, and at the same time, the materials extruded from the first nozzle are formed on the acid and bone surfaces inside the pair of molds. The material is continuously brought into close contact with each other, and the material extruded from the second nozzle is continuously brought into close contact with the surface (circumferential surface) of the cylindrical cooler.

At this time, the pair of molds are almost coalesced, and the inner shell is maintained in a tubular shape corresponding to the cooling temperature of the cylindrical cooler, and is integrated with the outer shell for maintaining the corrugated hollow phase.

This process occurs continuously in the axial direction of the tube body, thereby forming a corrugated double wall tube body having a predetermined length.

Here, each shell 3 has a plurality of peaks 4, both tapered surfaces 5 and valleys 6 maintaining a predetermined pitch interval on the outside of the inner shell 2, as described above. The present invention relates to a double wall pipe having rigidity and various characteristics.

However, the conventional corrugated double wall pipe is produced by the manufacturing apparatus as described above in the form of a straight pipe without a socket, and has a disadvantage in that a separate socket is required for connection.

In manufacturing a double wall pipe with a socket, when the socket is integrally formed in the double wall pipe, the inner diameter and the outer diameter are enlarged while being equivalent to a main body having a trapezoidal outer wall portion (shell) including an air layer to prevent deformation. It is very difficult to make it possible, and due to this difficulty, products of double walled pipes with sockets integrally having the cross-sectional shape of corrugated double walled pipes are not available on the market, and are not mass-produced in large quantities so that the double walled pipes cannot be mass produced. A separate socket is a must when connecting.

Particularly, the socket connected to the corrugated double wall pipe separately has a problem due to the fact that the material conditions and processing conditions are slightly different, resulting in accurate stipulations and variations in thermal expansion.The socket is inserted after installation of the corrugated double wall pipe. There are many disadvantages to waste construction time and costs.

Accordingly, an object of the present invention for solving the above-mentioned problems is to maintain a predetermined thickness at the end of a tube so that its diameter (including its inner and outer diameters) is enlarged proportionally and then the expanded state is maintained by a finite length. It is possible to provide a method for producing a corrugated double wall tube having an integrated socket capable of mass production.

1 is a perspective view for explaining the configuration of a corrugated double wall pipe according to the prior art,

2 is a perspective view for explaining the configuration of a corrugated double wall pipe having an integrated socket according to a first embodiment of the present invention;

3 is an enlarged cross-sectional view of the circle A shown in FIG.

4 and 5 are cross-sectional views for explaining a method for manufacturing a corrugated double wall pipe having an integrated socket shown in FIG.

FIG. 6 is a cross-sectional view illustrating a pipe connection relationship of a corrugated double wall pipe having an integrated socket shown in FIG. 2;

7 and 8 are cross-sectional views for explaining a method for manufacturing a corrugated double wall pipe having an integrated socket according to a second embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

100: double wall tube tube 100 ': corrugated double wall tube base tube

110: body portion 120: socket portion

121: insertion part 122: transition part

200: expansion apparatus 210, 220: coalescence and powder mold for expansion

213: cooling water line 219: pressurization device line

230: volume expansion device 238, 239: volume expansion limiting means

290: guide plate 300: rubber seal for pipe connection

An object of the present invention as described above in the manufacturing method of the corrugated double wall tube having a monolithic socket for producing a corrugated double wall tube base tube having a cylindrical length and a corrugated outer shell having a predetermined length and forming a trapezoidal cross section in a hollow shape, Forming a plurality of through-type slits by drilling a socket end portion of the corrugated double wall tube basic tube; A socket end portion having the slit is formed to be flexible enough to be heated by heating with a high temperature heating agent for a proper time; The flexible heated socket end portion is disposed in the expansion coalesce and powder mold including the mold acid, the tapered surface, the mold bone, the tapered expansion mold, and the ring-shaped guide plate corresponding to the expansion pipe size and shape. Becoming a step; When the rubber tube of the volume expansion device is inserted into the flexible heated socket end portion and inflated to a finite volume and diameter by using air pressure, the mold acid and the mold taper of the expansion-mold coal and powder molds are expanded. Forming a socket part in which a corrugated outer shape is maintained as it is expanded to correspond to the mold bone; It is achieved by the method of manufacturing a corrugated double wall tube having an integrated socket comprising the step of circulating a cooling water in the expansion pipe and powder mold to allow the socket to be cooled rapidly to stabilize the socket.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 2 to 8.

First Embodiment

2 is a perspective view for explaining the configuration of a corrugated double wall tube having an integrated socket according to the first embodiment of the present invention, and FIG. 3 is an enlarged cross-sectional view of circle A shown in FIG. 4 and 5 are cross-sectional views illustrating a method of manufacturing a corrugated double wall pipe having an integrated socket shown in FIG. 2, and FIG. 6 is a pipe connection relationship of the corrugated double wall pipe having an integrated socket shown in FIG. 2. It is sectional drawing for illustration.

First, as shown in FIG. 2, the corrugated double wall pipe having an integrated socket of the present invention is a double wall pipe body 100 manufactured based on the extrusion molding method, and the main body 110 and the socket 120 are integrally formed. Formed.

Here, the socket portion 120 has a relatively larger and smoother circumference than the diameter of the body portion 110 and the insertion portion 121 whose diameter is enlarged larger than the diameter of the body portion 110 so that the other tube can be inserted. And a transition portion 122 whose diameter is proportionally expanded between the insertion portion 121 and the main body portion 110.

The thickness from the inner shell of the socket portion 120 to the outer shell of the socket portion 120, or the thickness of the inner shell of the socket portion 120, or the thickness of the outer shell of the socket portion 120 may be applied to the main body portion 110. Compared with the similar thickness.

For example, when expanded using a corrugated double wall tube basic tube having an inner shell and an outer shell having a similar thickness, it may be made thinner than the thickness from the inner shell of the main body 110 to the outer shell of the main body 110. On the contrary, when using a corrugated double wall tube base tube having a relatively thick inner skin and an outer shell, it may be manufactured to be made equal or relatively thick.

However, the hollow trapezoidal cross-sectional shape formed between the inner shell of the socket portion 120 and the outer shell of the socket portion 120 of the present invention is formed without distorting the hollow trapezoidal cross-sectional shape of the main body portion 110.

As shown in an enlarged view in FIG. 3, when the body portion 110 of the smooth pleats extends from the transition portion 122, the portion where the bending is gently generated in the radial direction outward in the axial direction is the main body portion 110. And the transition region 122 are the first bending portions 123 that are in contact with each other.

In addition, when the transition portion 122 has a smooth wrinkle to the inserted insertion portion 121, the portion where the bending is gently generated in the inner radial direction of the axial direction is the transition region 122 and the insertion portion 121. Are second bending portions 124 that are in contact with each other.

In addition, the size of the transition peak 122a, the transition taper surface 122b, and the transition valley 122b of the transition region 122, which are arranged in plural between the first bending region 123 and the second bending region 124, The diameter of the transition region 122 may be gradually reduced in inverse proportion to the proportional expansion.

In addition, the sizes of the insertion peak 121a, the insertion taper surface 121b, and the insertion bone 121c of the insertion portion 121 are also the peaks 111 and the tapered surface of the main body 110 depending on the diameter expansion. 112, it may be formed slightly smaller than the bone 113.

Hereinafter, a method of manufacturing a corrugated double walled tube having an integrated socket of the present invention and various devices required for manufacturing will be described.

As shown in FIG. 4, in order to manufacture a corrugated double wall tube having a socket formed integrally, a conventional corrugated double wall tube basic tube 100 ′ is required.

A conventional corrugated double wall tube base tube 100 'has a cylindrical inner shell and a corrugated outer shell having a predetermined length and forming a trapezoidal cross section in a hollow shape by the corrugated double wall tube manufacturing apparatus described above in the prior art.

Here, the conventional corrugated double wall tube 100 (100 ') is a terminal portion (100'b) (hereinafter referred to as' socket end') where the socket is to be formed compared to the portion (100'a) where the socket will not be formed, for the sake of product diversity. The endothelial and the outer shell thickness of the site '), one of which is relatively thick, and one of which is relatively thin.

In each case, when the expansion is performed, the thickness of the inner and outer shells of the socket end portion 100'b is relatively thinner, thinner, or comparable to that of the portion 100'a where the socket will not be formed. Made the same as done.

To this end, in the present invention, among the above-mentioned caterpillar mold apparatus of the corrugated double wall pipe manufacturing apparatus, the inner peaks and valleys of a predetermined mold are formed smaller, equal or larger than the inner peaks and valleys of another mold, and as a result, the predetermined peaks and valleys are formed. The thickness can be controlled by allowing relatively less or equally high filling of the soluble material for extrusion in the mold.

In addition, it will be possible to adjust the extrusion pressure of the soluble material for extrusion by providing a separate material pressing device in the extruder or the extruder die of the corrugated double wall pipe manufacturing apparatus.

In this case, just before the predetermined mold is incorporated, the required size of pressure and the required amount of the extrudable soluble material from the first nozzle and the second nozzle are supplied to the inner surface of the predetermined mold and to the outer surface of the cylindrical cooler. Or pressurize the material feed pressure of the extruder for a finite period of time just before the predetermined mold is coalesced, and use a variable first nozzle (not shown) and a variable second nozzle (not shown) to By returning the extruded area after shrinking or enlarging only for a finite time, it helps to control the thickness of the endothelium and the skin.

And while the socket portion 120 having a trapezoidal hollow is expanded, the socket end portion 100'b or the insertion portion 121 of the socket portion 120 is maintained in order to maintain the trapezoidal hollow and the outer formation as it is. In the transition region 122, a plurality of through slits 102 (for example, about 3 to 4) are formed in order to draw out the air filled in the trapezoidal hollow to the outside (see FIG. 3 or 4).

Here, the through slits 102 may be formed using a drilling device such as a conventional drill machine.

In addition, although not shown, by the heating apparatus used in the present invention, the socket end portion 100'b of the corrugated double wall tube base tube 100 'is heated to a temperature at which heat deformation is possible.

In the present invention, the heating device is a temperature for heat deformation or a predetermined expansion temperature, and stores and heats a heating agent, for example, glycerin or the like for expansion operation, and the socket end portion 100'b inside the heated glycerin. As a predetermined device for quenching and softening the bay for a finite time period, the device may further include a transfer device such as a hoist and the like, and may be incorporated into the work line structure of the corrugated double wall pipe manufacturing apparatus.

In addition, another type of heating device that can be used in the present invention is a device for supplying hot air (hot air) to the socket end portion 100'b to make the portion flexible.

In particular, the temperature at which the heat deformation is possible or the predetermined expansion pipe temperature is determined according to the material of the double wall pipe, the temperature (self temperature and ambient temperature), the thickness of the shell and the shell, the product specification, the product length, and the like.

The heated corrugated double wall tube 100 'is heated to the expansion apparatus 200 by a hoist, a roller, a transfer device, or the like.

The expansion device 200 is expanded in the horizontal direction in the drawing, but if necessary expand the expansion and coalescing and powder molds 210 and 220 corresponding to the expansion size of the integrated socket that can be carried out in the vertical direction, the volume, Expansion device 230.

Expansion pipe coalesce and powder mold (210, 220) has a block shape provided in a plurality of pairs, the left and right (expanded pipe in the vertical direction) or the upper and lower (horizontal direction) of the corrugated double wall pipe 100 ' In the axial direction by the expansion and compression actuators 211 and 221 arranged on the rear side of the molds 210 and 220, respectively, arranged opposite to each other and extending in the axial direction. When moving in the direction facing each other, it becomes coalescing, and when it moves in the opposite direction, it becomes powder.

Mold acid 200a, mold taper surface 200b, and mold valley 200c corresponding to the size (dimension, shape) to be expanded are formed on the block inner circumference of each of the expansion pipe coalescence and powder molds 210 and 220, respectively. Doing. Here, the mold acid 200a, the mold taper surface 200b, and the mold valley 200c include the insertion acid 121a and the insertion taper surface 121b of the insertion portion 121 of the socket portion 120 of the present invention described above. ), Having a size corresponding to the insertion bone 121c (see FIG. 3), induces expansion of the diameter of the socket 120 and maintains the shape of the hill, the valley, and the tapered surface.

The expansion-molded coalescence and powder molds 210 and 220 further form a tapered expansion mold portion 200d on a block inner surface semicircle which is connected to the guide plate 290 described below.

Accordingly, after the corrugated double walled tube basic tube 100 'of the present invention is expanded, the tapered expansion mold portion 200d is used at the end of the socket end portion 100'b or the end of the socket portion 120. It has a tapered expansion end 129, and this product provides versatility to facilitate the pipe connection of the other pipe and the socket.

In addition, the expansion-molded coalescence and powder molds 210 and 220 are each formed with a cooling water inlet 212 and an outlet 214 connected to a predetermined cooling water supply device (not shown), respectively, and the molds 210 and 220. The cooling water line 213 may be arranged in the interior thereof to perform a cooling operation, and a heater (not shown) and a temperature controller of the power control means which are electrically connected to a power control means using an external power source to perform a heating action. It is further provided with a temperature sensor (not shown) electrically connected to and fixed to a predetermined position of the molds 210 and 220, and performing cooling and heating as necessary to expand the coalescence and powder molds 210 and 220 as necessary. It is a device that can change the temperature of the to proper temperature.

Here, the side of the cooling water inlet 212 of the expansion unit and the powder mold (210, 220) side of the ring shape having a width corresponding to the expansion diameter diameter, or the area that can contact the end portion (100 'b) The guide plate 290 is further provided to allow the end portion 100'b to be expanded to be constrained and expanded along the guide plate 290.

Inside the expansion pipe and powder molds 210 and 220, the socket end portion 100 ′ b heated to a predetermined expansion pipe temperature among the above-described corrugated double wall pipe bodies 100 ′ is extended to the side of the guide plate 290. Is inserted.

The volume expansion device 230 is inserted through the inner diameter of the guide plate 290, and is located at the center of the inner diameter of the end portion 100'b, and thereafter, generates a rubber tube for generating expansion force necessary for expansion according to systematic operation ( 232, an elongated and compressed actuator 231 coupled to control the insertion operation and position of the rubber tube 232, and a rubber tube 232 disposed outside and through an air in / out hole (AIR IN / OUT). Outside air supply and control means (not shown) for supplying high pressure air to the inside of the head), and conventional air flow rate control means (not shown) for controlling them electronically.

The volume expansion device 230 has an advantage that it is possible to easily adjust the speed and required expansion area compared to a predetermined piece mold that is radially expanded to variably form an inner circumferential surface corresponding to a predetermined circumference.

On the other hand, the rubber tube 232 of the volume expansion device 230 has a material and a thickness that can sufficiently withstand a predetermined expansion temperature, and can be expanded to a finite volume under a pre-designed expansion air pressure, It is piped through the outer surface, and an electronic valve (not shown) is attached to the air inlet and outlet, and the electronic valve is electrically connected to external air supply and control means to receive a control signal. In addition, the air inlet and outlet holes are piped to the air supply and discharge pipes of the external air supply and control means. External air supply and control means is conventional equipment that can supply air to the air inlet in the required amount according to a separate compression pump and conventional electrical and mechanical coupling.

The volume and diameter size of the rubber tube 232 to expand in the volume expansion device 230 is hollow, after the socket end portion 100'b is expanded in the expansion-coating and powder molds 210 and 220. It is designed to expand enough to maintain a trapezoidal cross section. In other words, the rubber tube is a device in which volume expansion limiting means 238 and 239 (rings, plates, wires, wire meshes, etc.) are inherent so as to expand only by a finite volume or diameter designed in advance even if air pressure is applied.

That is, since the rubber tube 232 of the volume expansion device 230 is different in diameter to expand by size of each product, the rubber tube 232 of each of the volume expansion device 230 is made separately and limited according to the expansion volume.

The volume expansion device 230 positions the rubber tube 232 to the outside and moves the rubber tube 232 to the inside of the socket end portion 100'b by the operation of the extension and compression actuator 231. It inserts and is located in the axial center predetermined position of the socket end part 100'b heated at the expansion pipe temperature among the corrugated double walled tube basic pipe | tube 100 '.

At this time, the expansion and coalescing mold (210, 220) to the outside is moved to the shaft center in accordance with the axial stretching operation of the extension and compression type actuators (211, 221), respectively, to be coalesced, the end portion (100) The outer surface of the 'b) is separated by the expansion distance from the mold acid 200a, the mold taper surface 200b, the mold valley 200c, and the tapered expansion mold portion 200d of the expansion-mold and powder molds 210 and 220. Will be.

In addition, the external air supply and control means transmits a control signal to the electromagnetic valve, which causes the electronic valve to open the air inlet and outlet holes, and then injects high-pressure air into the rubber tube 232 to inject the rubber tube 232 to the design value. Inflate.

When the cylindrical outer circumferential surface of the rubber tube 232 started to expand in surface contact with the inner circumferential surface of the end portion 100'b, it is grasped by any one of methods such as time control, laser sensor control, and pressure fluctuation sensor control. Becomes

As shown in FIG. 5, the rubber tube 232 which expands as described above in the volume expansion device 230 expands the end portion 100 ′ b to be the socket or the socket portion 120 while expanding by a finite volume. The rubber tube 232 is expanded in correspondence with the expansion ratio.

At this time, the outer surface of the end portion (100 'b) is the mold acid 200a, the mold taper surface (200b), the mold valley (200c) of the expansion and coalescing and powder mold (210, 220), the tapered expansion mold portion ( 200d), air is no longer pressurized into the rubber tube 232 by a finite time or by control signals such as detection of a laser sensor or pressure fluctuation. Expansion stops.

At the same time, a coolant supply device (not shown) is operated, whereby the coolant begins to circulate through the coolant inlet, the coolant line, and the coolant outlet, thereby expanding the socket portion with the expansion coalescing and powder molds 210 and 220. Cool 120. At this time, the cooling temperature may be adjusted in response to the operation of the heater mounted on the expansion coal and powder mold (210, 220).

On the other hand, when the socket portion 120 is solidified in the expanded state, the expansion coalescing and powder molds 210 and 220 according to the systematic signal according to the axial compression operation of the extension and compression actuators 211 and 221. At the same time, they move outward to the center of the shaft to be powdered, and at the same time, air is quickly released from the rubber tube 232 of the volume expansion device 230, thereby reducing the volume of the rubber tube 232, and consequently, the expanded socket. The double wall pipe body 100 which has the part 120 is completed.

The double-walled tube body 100 having the expansion pipe socket portion 120 thus completed is moved to a loading position by a conveying equipment such as a hoist or a roller.

As shown in FIG. 6, the double wall pipe body 100 of the present invention having the expanded socket part 120 and the main body part 110 may be formed by using a rubber packing 300 dedicated for ring wall double pipe pipe connection. It is associated with the tube, i.e., the other tube 100 ".

In other words, the pipe-only rubber packing 300 is applied to the specific portion in the state coupled to the other pipe (100 ") and is fitted into the inner circumference of the expanded socket portion 120, when coupled to the local action of the lubricant According to the pipe connection dedicated rubber packing 300 is in sliding contact with the inner circumference of the socket portion 120 is coupled, at this time, the separation prevention portion or separation prevention rip (rip) of the pipe connection dedicated rubber packing (300) to the coupling force. Folded by the combination does not interfere with the coupling, the coupling between the tubular body (100, 100 ") is made quickly and easily.

When extending in this manner in the longitudinal direction, the conventional double-wall pipe tube dedicated rubber packing 300 is required and can be reduced to half of the two pipe joint construction.

Second Embodiment

In this embodiment, in comparison with the previous embodiment, the flexible sealing plate and the pressurizing device line are mounted inside the large diameter coalescence and powder mold, so that the internal space of the mold formed when the large diameter coalescence and the powder mold is coalesced is lower than atmospheric pressure. It is the same as the first embodiment except for maintaining the pressurized state of the pressure to smoothly expand the socket end portion while maintaining the shape. Therefore, the same or similar reference numerals will be given to the same or similar configuration, and duplicate description thereof will be omitted.

7 and 8 are cross-sectional views illustrating a method of manufacturing a corrugated double wall pipe having an integrated socket according to a second embodiment of the present invention.

As shown in FIGS. 7 and 8, the body part and the socket part 120 are integrally formed, and the expanded insertion part 121 and the transition part 122 of the socket part 120 are more accurately and quickly. In this embodiment, improved expansion coalescing and powder molds 210 and 220 are provided in this embodiment.

The pressurizing device penetrates any one of the mold acid 200a, the mold taper surface 200b, the mold valley 200c, and the tapered expansion mold part 200d in the expanded expansion coalescence and powder molds 210 and 220. Lines 219 are arranged respectively.

Each pressurizing device line 219 is not shown externally, but the suction pipe of the pressurizing pump device to discharge the air in the inner space formed when the large diameter coalescing and the powder mold are incorporated into the necessary pressurizing pump device to the pressure pumping device. It is connected to. The pressurization pump apparatus is a kind of pressurization pump using electric power, and a conventional pump product having suction performance corresponding to the inner space volume of the large diameter coalescence and powder mold can be used, and the pressurization pump apparatus is adapted to adjust the pressure in response to a predetermined factor value. It further has a pressure regulating means constituted by an electric circuit and another electromagnetic valve electrically connected to the pressure regulating means and coupled to the suction pipe.

The inner space of the expansion-molding and powder molds 210 and 220 should be almost sealed. For this purpose, flexible sealing plates in addition to the guide plate 290 are formed at both edges of the expansion-molding and powder molds 210 and 220. 291 is further attached.

The flexible sealing plate 291 is ring-shaped, and is a rubber or silicone sealing means having an inner diameter that can be in close contact with the outer circumferential surface of the corrugated double wall tube basic tube 100 '. The flexible sealing plate 291 surrounds the insertion part of the socket part 120 and serves to maintain the airtight state while being in close contact with the outer surface of the insertion part naturally according to expansion of the insertion part.

In addition, the size of the inner diameter of the guide plate 290 is formed to be airtight and correspond to the outer diameter of any one of the volume expansion limiting means (238, 239) provided on the side of the rubber tube (232). Thus, when the elongation of the volume expansion device 230 and the working shaft of the compression type actuator 231 are elongated, a rubber tube 232 is inserted into the inner space of the expansion coalescing and powder molds 210 and 220, At this time, the rear volume expansion limiting means 238 is in close contact with the inner diameter of the guide plate 290, it can minimize the inflow of outside air.

Hereinafter, describing another manufacturing method of the present invention, after forming a plurality of through-type slits 102 by drilling the socket end portion 100'b in the corrugated double wall tube basic tube 100 ', the slits 102 are formed. The socket end portion (100'b) having a is heated by a high temperature heating agent or hot air for a proper time to be formed to be flexible enough to expand.

The flexible heated socket end portion 100'b includes a mold mount 200a, a mold taper surface 200b, a mold valley 200c, a tapered expansion mold portion 200d, and a ring shape corresponding to the expansion dimension and shape. Of the expansion-mold coalescence and powder molds 210 and 220 having a guide plate 290 and a ring-shaped flexible sealing plate 291.

Depending on the elongation of the elongate and compression actuator 231, the rubber tube 232 of the volume expansion device 230 is inserted into the flexible heated socket end portion 100'b.

Thereafter, the rubber tube 232 is expanded to a finite volume and diameter by using air pressure, and at the same time, the expansion coalescence and powder mold 210 along the pressurization device line 219 according to the operation of the pressurization pump device and the electromagnetic valve. Air in the inner space of the 220 is discharged to the outside, so that the pressure in the inner space of the expansion pipe and the powder molds 210 and 220 is maintained in a pressurized state.

In this case, the flexible heated socket end portion 100'b has a mold acid 200a, a mold taper surface 200b, and a mold valley 200c arranged in a direction in which internal air escapes before its shape is distorted. ), The tapered expansion mold portion (200d) toward the natural and quickly close to the pressure change, according to the expansion operation is performed very smoothly, as a result of the expansion and coalescing the powder (210, 220) in the interior The socket portion 120 in which the corrugated outer shape is maintained is formed.

Subsequently, a cooling water is circulated in the expansion coal and powder molds 210 and 220 so that the socket 120 is rapidly cooled, and the socket 120 is cured. Then, the rubber tube 232 and the expansion coal are combined with each other. The powder molds 210 and 220 are in situ.

In this case, the corrugated double wall tube of the present invention having the socket portion 120 integrally with the corrugated double wall tube basic tube 100 'is completed.

According to the present invention configured as described above, the manufacturing method capable of mass-producing a corrugated double wall tube having an integrated socket in which the socket portion is integrally formed while maintaining the high rigidity throughout the tube in the same thickness as the thickness of the main body portion. Has the effect of providing.

In addition, in the method for manufacturing a corrugated double wall pipe having an integrated socket according to the present invention, after fabricating a corrugated double wall pipe basic tube systematically using an existing corrugated double wall pipe manufacturing apparatus improved by the applicant of the present invention, a heating device is used. After making the socket part flexible, it is mass-produced with large-diameter coalescence, powder mold, and rubber tube 232 type volume expansion device. There is an advantage that can be provided.

In addition, preferred embodiments of the present invention are disclosed for the purpose of illustration, those skilled in the art will be possible to various modifications, changes, additions, etc. within the spirit and scope of the present invention, such modifications and changes should be considered to belong to the following claims. something to do.

Claims (4)

In the method of manufacturing a corrugated double wall tube having an integral socket for producing a corrugated double wall tube basic tube 100 'having a cylindrical length and a corrugated outer shell having a predetermined length and forming a trapezoidal cross section in a hollow shape, Drilling a socket end portion (100'b) of the corrugated double wall pipe (100 ') to form a plurality of through-type slits (102); A socket end portion (100'b) having the slit (102) is heated to a suitable time with a high temperature heating agent and formed to be flexible enough to be expanded; The flexible heated socket end portion 100'b includes a mold mount 200a, a mold taper surface 200b, a mold valley 200c, a tapered expansion mold portion 200d, and a ring corresponding to the expansion dimension and shape. A step of being disposed in the expansion coalescing and powder mold (210, 220) including a guide plate (290) of a shape; When the rubber tube 232 of the volume expansion device 230 is inserted into the flexible heated socket end portion 100'b, and expanded to a finite volume and diameter using air pressure, the expansion joint is expanded. And a socket portion 120 in which a corrugated outer shape is maintained while being expanded to correspond to the mold acid 200a, the mold taper surface 200b, and the mold valley 200c of the powder molds 210 and 220. Steps; Corrugated with an integrated socket characterized in that it comprises the step of stabilizing the socket portion 120 by circulating the cooling water in the expansion unit and the powder mold (210, 220) to cool the socket portion 120 rapidly Method of manufacturing double wall pipes. The method of claim 1, The socket end portion having a slit 102 (100 'b) is heated with a high temperature air (hot air) for a predetermined time is further formed to be flexible enough to expand the pleat having a socket having an integrated socket, characterized in that Method of manufacturing double wall pipes. The method of claim 1, When the flexible heated socket end portion 100'b is expanded in the volume expansion device 230 and the expansion coal and powder molds 210 and 220, the expansion coal and powder molds 210 and 220 are expanded. Method of manufacturing a corrugated double wall pipe having an integrated socket characterized in that the constriction is extended along the ring-shaped guide plate 290 mounted on the). The method of claim 1, Along the pressurizing device line 219, while the inner spaces of the expansion pipe and powder molds 210 and 220 are maintained in a pressurized state, the flexible heated socket end portion 100'b is the volume expansion device. And expanded in the coalescence and powder molds 210 and 220, thereby having a relatively larger and smoother circumference than the diameter of the body portion 110, and dedicated rubber packing to the other pipe 100 ". Method of producing a corrugated double wall tube having an integrated socket, characterized in that for forming the socket portion 120 having a diameter extended to be inserted in the state via the 300, the hollow trapezoidal cross section.