KR20040014856A - Connecting pipe embeded with heating coil for plastic pipes and method for producing the same - Google Patents

Abstract

PURPOSE: A connecting pipe having a hot wire and manufacturing method thereof is provided to increase the watertightness and the support strength of the connecting pipe. CONSTITUTION: A method for manufacturing a connecting pipe(10) having a hot wire(11) comprises the steps of: continuously supplying the hot wire to an extruding machine for forming a hot wire inserted pipe wall member(12); forming the hot wire inserted pipe wall member; winding the hot wire inserted pipe wall member around the outer circumference of a pipe forming drum; joining opposite side surfaces of the hot wire inserted pipe wall member; and leveling the joint portions(13) of the hot wire inserted pipe wall member.

Description

CONNECTING PIPE EMBEDED WITH HEATING COIL FOR PLASTIC PIPES AND METHOD FOR PRODUCING THE SAME}

The present invention relates to a connecting pipe used for connecting and connecting a synthetic resin pipe, and more particularly, a heating hot wire is spirally formed inside a pipe wall in a molding manufacturing step of a cylindrical single pipe-type connecting pipe mounted on an outer circumferential surface of a connecting target synthetic resin pipe. It relates to a connection pipe for a synthetic resin pipe and a manufacturing method of the heat wire is embedded to be embedded.

In general, a synthetic resin tube is divided into a straight tube having a substantially flat cylindrical surface according to its outer circumferential surface and a corrugated tube in which a recess between a spiral or ring-shaped ridge and a ridge is repeated. There is a difference in the connection method and structure.

In the case of the straight pipe, the single wall straight pipe made of a single cylinder is formed into a double layer and the so-called double wall straight pipe which is formed integrally with the inner and outer layers through the connecting vertical pipe wall according to the cross-sectional shape of the pipe wall. Regardless of the cross-sectional structure of the pipe wall, the connection of the pipe is made through several connection methods as shown below.

As a typical form that has been widely used in the connection method of the synthetic resin straight pipe, the tube to be connected to the inside of the socket by integrally forming a connecting socket having an enlarged diameter at one end of the tube or by combining a separately formed socket Socket connections are known which allow the insertion of a.

The socket connection method is to ensure the watertightness of the connection connecting portion through the adhesive layer or watertight packing on the contact portion between the inner peripheral surface of the socket and the tube inserted therein, but the connection process is relatively simple, but the connection process is sufficient It is difficult to secure the watertightness, and when the external force is applied to the connecting part after the connection construction or the internal pressure due to the fluid flowing in the pipe is changed rapidly, the socket and the pipe inserted into the pipe are separated from each other. The disadvantages are pointed out.

Next, as one of the connecting methods for the synthetic pipe in the form of a straight pipe, while wrapping the two pipes to be connected with each other, the outer circumferential surface is wrapped with a sheet for packing or a heat shrink sheet, and then a metal band having a constant width is mounted on the outer circumferential surface again. A band-mounted tubular connection structure is known.

The band-mounted pipe connecting structure has an advantage that the damage to the connecting part and the detachment of the connecting body are suppressed to some extent even if the outer peripheral surface of the connecting connecting part is supported and reinforced by the band, even if a load is applied to the connecting part after the connecting construction of the pipe. In addition, it is difficult to secure the watertightness of the connection part, and it is disadvantageous in that connection work such as winding a shrink sheet and fastening a band thereon is cumbersome.

As another conventional synthetic resin straight pipe connection structure, a fusion splicing method is known in which a connection between a connecting pipe and a target pipe is made by heat fusion using a connector provided with a stepped portion on an inner circumferential surface and a fusion mesh attached to both sides thereof as a hot wire. As a specific example of such a fusion splicing method, the 'double resin pipe fusion connector' disclosed in the Korean Patent Publication (Publication No. 2000-36271) will be described with reference to FIG. 1.

As shown in the drawing, the conventional fusion splicing type pipe connection structure has a cylindrical short pipe shape and has an inner diameter into which the connection target pipe 1 (1 ') can be fitted in a contact state. In the use of the provided connection pipe 2, the fusion mesh 4 made of hot wire is attached to both side surfaces and the inner circumferential surface of the stepped portion.

At this time, the connecting pipe (2) forms an inclined surface (5) on both sides to facilitate the insertion of the connecting object (1) (1 ') to be fitted thereto, and as the outer peripheral surface by applying a current to the fusion mesh (4) The connection terminal 6 for generating heat is extended to the outside.

The connection of the pipe body 1, 1 'using the connection pipe 2 of such a structure pushes the connection object pipe 1, 1' through both open ends of the connection pipe 2, and each end part is connected. By applying a current to the fusion mesh 4 through the connection terminal 6 in a state in which the contact state is maintained by using a separate tightening device in a state to be in contact with the step (3) of the connection pipe (2) It achieves through the process by which the fusion | melting joining by melting of resin is performed in the contact part between the connection object body 1 (1 ') and the connection pipe 2.

The fusion splicing method has the advantage that high watertightness can be expected by fusion of these two members at the joint between the connecting pipe and the connecting object tube, and there is an advantage that the connecting operation is relatively simple.

However, in the case of the fusion splicing method, the connector used for this, because the manufacturing is made through the process of attaching the fusion mesh on the inner circumferential surface using a separate facility after molding the connector tube made of synthetic resin once Inevitably increase the manufacturing cost, and because the area of fusion between the connecting pipe and the connector is narrow, if the external force is applied to the connection after connection, there is a high possibility that separation of the connection occurs. It is pointed out that Esau is not suitable for application.

The present invention was devised in view of the above problems pointed out in the conventional synthetic resin pipe connection structure, and improved high water tightness by improving the fusion splicing structure and high support strength at the connection part after connection construction An object of the present invention is to provide a connection pipe for a synthetic resin pipe in which a heating wire is embedded so as to be maintained, and a manufacturing method thereof.

1 is an exploded perspective view showing an example for the connection structure of a conventional synthetic resin tube.

Figure 2 is a perspective view showing the overall structure of the connector according to the present invention.

Figure 3 is a partially cutaway front view of the connector according to the present invention.

Figure 4 is a perspective view of the overall device showing a connector manufacturing process according to the present invention.

Figure 5 is a partially cutaway front view showing a connector forming process in Figure 4;

6 (a) and 6 (b) show a hot wire embedding process of the pipe wall forming member constituting the connecting pipe of the present invention.

(A) refers to the purchase process of zigzag hot wire,

(B) is about the purchase process of mesh type hot wire.

Figure 7 is a front view of the pipe connecting portion showing a process of connecting the synthetic resin pipe using the connector of the present invention.

((Explanation of symbols for main parts of drawing))

10. Connector

11,11 ', 11 ". Hot wire

12. Hot wire embedded pipe wall member

13. Connection

The above object of the present invention is achieved by a connector for a synthetic resin pipe and a manufacturing method thereof so that the hot wire is embedded in a spiral line in the tube wall of the connector in the molding manufacturing step of the connector.

The connecting tube according to the present invention takes the form of a cylindrical single tube having an inner diameter such that the outer circumferential surface of the tube to be connected can be fitted while maintaining at least partly in contact with the inner circumferential surface of the connecting tube.

The material of the connection pipe is preferably kept the same as the material of the pipe to be connected, and the embedding position in the pipe wall of the hot wire spirally embedded in the wall of the connection pipe is to be maintained in the state close to the inner peripheral surface of the connection pipe. It is required to allow the inner surface portion of the connecting pipe to be melted and integrally fused to the outer surface of the connecting pipe during heating using a heating wire after insertion of the connecting pipe into the inside of the pipe.

The connector may include a heat-shrinkable raw material in the synthetic resin material constituting the connector or the connector tube may be made of a heat-shrinkable material to ensure more secure watertightness and increased adhesion strength to the connector.

The hot wires spirally embedded in the pipe wall may be a straight line in which one or more hot wires are arranged in parallel with each other at equal intervals, and a curved line or a plurality of lines crossing each other by bending a single hot wire in a zigzag shape on the same plane or The through part may take various forms such as a mesh-like mesh formed in a lattice form.

The connecting tube of the present invention has a cylindrical simple straight tube shape, the inner and outer surface of the smooth surface, and is interposed between the hot wire embedded pipe wall member and the spiral hot wire embedded tube wall member wound spirally with a hot wire embedded therein It consists of a joining portion to form a cylindrical tubular body by connecting and joining between adjacent hot wire buried tube member.

At this time, it is preferable that the joining portion constitutes a substantially "I" -shaped cross section of the same synthetic resin material as the joining member for the hot wire embedding tube member so that the opposing joining surfaces of the hot wire embedding tube wall member are fusion bonded to both sides of the joining member.

The joint portion may be formed of an adhesive layer on which at least one surface of the object to be bonded of the heat wire-embedding pipe wall members facing each other is directly bonded to each other.

In another embodiment of the joint, a fusion splicing portion in which each face of the mutually opposed heat wire-filling pipe wall members is heated to a temperature above the softening point by separate heating means so that the joint target surfaces are directly fusion-bonded to each other without a separate intermediate intervening layer. It may be configured as.

The connection pipe for the heat-wire-filled synthetic resin pipe of the present invention having the structure as described above is based on the pipe manufacturing method applied in the method of manufacturing the synthetic resin double wall smooth pipe of Patent No. 136249 registered and patented by the present inventor in the manufacturing method thereof. It is manufactured as follows.

Therefore, in manufacturing the connector according to the connector manufacturing method of the present invention there is an advantage that the existing synthetic resin double wall tube manufacturing apparatus can be used as it is.

The method of manufacturing a connection pipe for a hot wire embedded synthetic resin pipe according to the present invention includes the steps of continuously supplying a hot wire to an extruder for forming a hot wire embedded pipe wall member, and molding the hot wire embedded pipe wall member by extrusion molding with the hot wire embedded therein. And spirally winding the hot wire embedding tube member on the outer circumferential surface of the tubular forming drum, and joining opposite sides of mutually adjacent hot wire embedding tube wall members wound in a spiral manner, to the junction of the hot wire embedding tube wall member. It consists of a series of continuous processes consisting of flattening using a roller and cooling and cutting to a predetermined length.

At this time, the hot wire is supplied to the rear of the extruder in a state in which a plurality of single wires wound on the spool are guided by a guide roller installed on a hot wire supply path in front of the extruder.

Alternatively, the hot wire may be heated by a separate heating means and supplied to the bottom surface of the tube wall member in a soft state exiting the extruder, so that the hot wire may be embedded on the tube wall member by pressing.

The heat wire-embedded pipe wall member continuously molded and extruded through the extruder is cooled and sized into a predetermined shape via a cooling and sizing device installed on a path that is transferred to the tube-forming drum in front of it.

On the other hand, the joining of the spiral wire wound tube member wound spirally on the outer circumferential surface of the tubular forming drum is melt molten synthetic resin injected into the gap between the hot-wire embedded tube wall member through the nozzle in the same way as the joint forming method of the hollow small tube in the conventional synthetic resin double wall tube By doing so, it is preferable to make a connection joint between the pipe wall members.

As another joining method of the hot wire embedding tube member, after the adhesive layer is applied to the surface to be joined, the opposing surfaces of the tube wall member having the adhesive coating layer are closely adhered to each other in the process of moving the hot wire embedding tube member through the outer circumferential surface of the tube forming drum in a spiral manner. Alternatively, in the state in which the bonding target surface is heated and partially melted, the bonding target surfaces may be in contact with each other, thereby allowing direct fusion bonding to be performed.

The structure of the connection pipe for the heat-wire-filled synthetic resin pipe of the present invention, its manufacturing method and general features will be more clearly understood by the following description with reference to the drawings showing preferred embodiments of the present invention.

First, Figures 2 and 3 is a perspective view and a partially cut-out front view of an embodiment of a connector for a thermal wire-filled synthetic resin tube according to the present invention, as shown, the heat-wire-embedded tube 10 of the present invention is inside the pipe wall The heat wire embedding tube wall member 12 having the hot wire 11 embedded therein is wound in a spiral shape, and the hot wire embedding tube wall member 12 is formed of a cylindrical straight pipe which is integrally connected and joined by the joint 13.

In this case, the hot wire 11 embedded in the hot wire buying tube wall member 12 is formed by local heating only on the inner surface layer of the hot wire buying tube wall member 12 including the joint 13 when the pipe is connected. In order to prevent the shape deformation of the connection pipe 10 itself in the process of fusion bonding to the outer surface layer of the connection target tube inserted into the inside and the heating process is embedded adjacent to the inner surface layer of the heat wire embedding tube wall member 12.

Next, in the present embodiment, the junction part 13 is made of a connecting member having a substantially "I" shaped cross section made of a synthetic resin of the same material as the heat wire embedding tube wall member 12. The " I " -shaped cross-section connection member is injected into a molten resin state between the hot wire embedding tube wall members 12 and cooled to solidify, thereby substantially forming a body with the hot wire embedding tube wall member.

The connector 10 of the present invention is exposed to the heating wires 11 embedded in the heating wire embedding pipe wall member 12 on both end faces forming the opening portion, respectively, so that the power supply connecting terminal through spot welding or the like (not shown) Connected with

The diameter of the connecting pipe 10 is changed according to the outer diameter of the connecting object tube, the connecting object as the connection object can be inserted while making a surface contact or partial surface contact over the entire area into the connection pipe. It is desirable to have a slightly larger inner diameter than the outer diameter of the tube.

In addition, the pipe wall thickness of the connection pipe 10 is required to be molded to a thickness such that sufficient support strength is maintained when a load or external force is applied to the connection part after the connection construction of the pipe, and a preferable thickness range is 5 to 20 mm. It is enough. The larger the diameter of the pipe to be connected and the higher the load or earth pressure applied to the municipal plant of the pipe to be connected, the thicker the pipe is preferably maintained.

Figure 4 schematically shows the manufacturing process of the connector of the present invention, Figure 5 shows only the process of joining the hot-wire-embedded pipe wall member during the manufacturing process of Figure 4, with reference to these drawings the manufacturing method and the method of the present invention The structure of the device used to perform is as follows.

In the method of the present embodiment, the heating wire 11 consisting of three strands is used. As shown, the three strands of the heating wire 11 are continuously conveyed from the spool 14 to continuously melt the pipe wall member. It is drawn in the rear of the extrusion die 15a of the main extruder 15 so that extrusion to a predetermined shape is performed.

Next, in the extrusion die 15a for forming the pipe wall member, the hot wire 11 drawn therein is surrounded by the molten synthetic resin to have a substantially rectangular cross section, and the hot wire embedded pipe wall member 12 having the hot wire 11 embedded therein. ) Will be extruded.

Subsequently, the heat wire-embedding pipe wall member 12 which has exited the extrusion die 15a is sized into a predetermined shape while passing through the sizing and cooling means 16 installed on the moving path in front thereof, and then cooling is performed. It is wound spirally on the outer circumferential surface of the tube forming drum 18 to rotate the feed.

The hot wire-embedded pipe wall member 12 wound on the outer circumferential surface of the pipe forming drum 18 has a gap between adjacent pipe wall members, and the gap is provided with a supply of molten resin from the auxiliary extruder 17. The molten resin is filled through the joining part forming nozzle 19 to form the joining part 13, thereby making the connection between the heat wire embedding pipe wall members 12.

Next, in order to flatten the heat wire embedding tube wall member 12 and the joint 13, the flattening is performed by pressing the joint 13 through a pressing roller 21 provided on the outer circumferential surface of the tube forming drum 18. A straight tube connector is formed.

Thereafter, the connection pipe 10 passes through a predetermined cooling process and then exits the drum forming drum 18, and thus the cutting pipe is cut to the required length, thereby completing the manufacture of the connection pipe according to the present invention.

On the other hand, in embedding the heating wire 11 in the interior of the tube wall member, as shown by the dotted line in Figure 4 is heated through a separate heating means 22 to the bottom surface of the tube wall member exiting the extrusion die 15a. The hot wire 11 may be supplied and the hot wire thus supplied may be embedded in the bottom side of the tube wall member while passing through the roller R. As shown in FIG.

At this time, the heating wire 11 is in a heated state, and the tube wall member just exiting the extrusion die 15a is in a softened state so that the tube wall member and the heating wire 11 are not required without a separate crimping means. In the process of passing while contacting the outer circumferential surface of the roller, the heating wire is naturally purchased.

6 (a) and 6 (b) show another embodiment of a hot wire embedded in the hot wire embedding tube wall member 12, and (a) shows that the disconnection is slightly smaller than the width of the hot wire embedding tube wall member 12. The heating wire 11 'is bent in a zigzag shape to have a width.

6 (b) shows a process in which a mesh hot wire 11 ″ formed by weaving a plurality of thin hot wires into a net form or punching a thin metal plate and formed into a net form is embedded in the inside of the hot wire buying tube wall member 12. Is showing.

The connector for the heat-wire-filled synthetic resin pipe obtained through the method of the present invention can be used for connection bonding of all synthetic resin pipes in the form of a cylindrical straight pipe.

In particular, since the connector of the present invention has a thick thickness and forms a fusion joint up to a considerable length across both the left and right sides of the connection part of the connection object, the connector shows high support strength on the connection part after connection. It is advantageous for the connection connection of large diameter sewer pipes, drain pipes or wire protection pipes that require high support strength and strong resistance to external pressure after underground laying.

Figure 7 is a front view showing a form of connecting the synthetic resin double-walled pipe used for the purpose of drainage pipe, mainly buried in the ground using the connection pipe according to the present invention, as shown, by using the connection pipe of the present invention In the case of connecting the pipes, each end of the pipe 23 to be connected is inserted into contact with each other at the inner central point of the pipe 10, and then connected to the heating wire 11 exposed to both sides of the pipe 10. When the current is applied to the heating wire through a separate power supply device (not shown) in the state of connecting the 24, melting occurs in the inner circumferential surface layer of the connection pipe 10 to the outer surface of the pipe 23 to be connected. Fusion is made integrally.

At this time, in order to facilitate the connection between the heating wire 11 and the connection terminal 24 exposed to both end surfaces of the connection pipe 10, by melting locally the hot wire exposed portions at both ends of the connection pipe 10 as shown in the drawing. It is desirable for the hot wire to be exposed to the outside.

The inner circumferential surface of the connection pipe 10 in which the fusion occurs is relatively wider than that of the fusion part provided in the conventional fusion connection type connection pipe, thereby ensuring high watertightness and maintaining high supporting strength of the pipe connection part. It becomes possible.

As described above, the connecting tube of the present invention is formed in a cylindrical single tube form consisting of a hot wire embedded tube wall member wound in a spiral shape with a heating wire embedded in the inner bottom face and a joint portion for integrally connecting and joining these tube wall members. There is an advantage or effect such as.

First, the connection pipe of the present invention is formed on the entire inner circumferential surface of a relatively large area is formed by the heat generation of the heating wire can secure a high watertightness of the pipe connection by securing a wide fusion adhesive layer between the connection pipe and the pipe to be connected.

In addition, since the tube itself is formed to a thickness having sufficient support strength, the connector tube of the present invention has a length that is sufficiently extended to both the left and right sides with respect to the tube connection portion in the length thereof. Even if no additional support device is installed after the installation of the pipe using the connector, it shows sufficient support strength at the connection. Therefore, even if earth pressure or local load is applied to the connection after the connection, the connection may be damaged or the pipe may be removed from the connection pipe. There is an advantage that the departure is suppressed.

In addition, the present invention is a fusion splicing is made simply by applying the power to the heating wire after inserting the connecting object to the inside of the connecting pipe when the connection of the pipe is made, the connection of the pipe is made easily, it is necessary to connect the pipe Ancillary equipment or materials are minimized.

In addition, the connector of the present invention has an additional advantage that the existing apparatus can be utilized in that it can be produced simply by adding a few facilities or modifying the apparatus used for manufacturing a conventional synthetic resin double wall tube. .

Claims (9)

A connecting pipe for connecting a synthetic resin pipe, wherein the heating wire-embedded pipe member with a hot wire embedded therein is wound in a spiral shape and the heated wire-filled pipe wall member is made of a cylindrical straight tube integrally connected and joined by a joint. Purchased connector for synthetic resin pipe. According to claim 1, wherein the heating wire is a straight line arranged in parallel with one or more strands, at least one strand within the width of the heating wire-embedded pipe wall member in a zigzag bent form on the same plane or a mesh type that crosses a plurality of lines from side to side The connection pipe for a synthetic resin pipe in which the heating wire is embedded, wherein the heating wire is embedded in the inner surface side of the wall member. The connection line according to claim 1, wherein the joining portion is formed of a "I" shaped joining member formed by a molten resin filled in a gap between the hot wire embedding tube wall members wound adjacent to each other in a spiral manner. tube. According to claim 1, wherein the joining portion is a heat pipe-embedded connection pipe for a synthetic resin tube, characterized in that made of an adhesive layer is applied to the adjacent opposing surface of the heat-wire-embedded pipe wall member to join them 2. The connector of claim 1, wherein the joining part comprises a fusion joint part in which the opposing surfaces of the hot wire embedding tube wall members are opposed to each other. In the method of manufacturing a synthetic pipe connecting pipe, the step of continuously supplying the hot wire to the extruder side for forming the hot wire embedded tube wall member, the step of forming the hot wire embedded tube wall member by extrusion molding with the hot wire embedded therein, Spirally wound a pipe wall member on an outer circumferential surface of the tubular forming drum, joining opposite sides of mutually adjacent hot wire buried pipe wall members wound in a spiral shape, and flattening the joint of the hot wire buried pipe wall member; And cooling and cutting to a predetermined length. According to claim 6, wherein the heating wire is a straight line arranged in parallel with one or more strands, at least one strand within the width of the heating wire-embedded pipe wall member zigzag bent in the same plane or a plurality of lines intersecting the left and right mesh A method for manufacturing a connecting pipe for a synthetic resin pipe in which a heating wire is embedded, wherein the heating wire is embedded in the inner surface side of the heating wire embedding tube wall member. The method of manufacturing a connector for a synthetic resin pipe in which a hot wire is embedded, characterized in that the molten resin is injected into a gap between the hot wire embedding pipe wall members wound adjacent to each other and spirally wound. The method of claim 6, wherein the joining between the heat wire-embedded pipe wall member is formed by applying an adhesive to the adjacent opposing surfaces of the heat-wire-embedded pipe wall member or by heating the opposing surfaces to a softening point or more and then contacting each other. Method of manufacturing a connection pipe for a synthetic resin pipe.