KR101457110B1 - Method for connecting double insulation pipe and method and apparatus for manufacturing connection pipe with roller rotation plate - Google Patents

Abstract

The present invention relates to a tube expander having a roller rotation plate, an expanding method using a tube expander, and a method of connecting a double insulation pipe using a connection pipe expanded through an expanding method. More specifically, an apparatus to expand a casing for the connection with a joint part of a double insulation pipe includes: a heating furnace horizontally movable on a support, having an internal space heated to a preset temperature, and allowing the casing to be introduced into the internal space in a pipe expanding work; a plurality of rollers provided in the shape of a rod having one end with a gradually reduced diameter; a driving unit provided at one side of a vertical frame to rotate each roller about a longitudinal axis of the roller; a rotational plate having a central axis coupled to the driving unit, opposite ends of the rollers being radially installed on the rotational plate; a rotating unit to rotate the rotational plate about the central axis; and a roller fixing plate having the center fixed to the end of the central axis, and provided therein with a plurality of holes into which pointed parts of the rollers are inserted, so that the movement of the pointed parts of the rollers are restricted. After the rotational plate has been rotated in a specific direction by the rotating unit in the state that the roller is not rotated, the casing is fixed to the rollers, and the rollers are rotated by the driving unit to expand the casing, so that the connection member is formed. A source material a material having restoring force contracted after receiving heat.

Description

[0001] The present invention relates to an expansion pipe having a roller rotating plate, a pipe expansion method using the expansion pipe, and a connection method of a double insulation pipe using a connection pipe extended by the pipe expansion method. }

The present invention relates to an expanding unit having a roller rotating plate, a expanding method using the expanding unit, and a connecting method of a double insulated pipe using a connector enlarged by the expanding method. More specifically, the present invention relates to a method of manufacturing a pipe-type pipe, which uses raw materials having stretchability, thermal restoration force and heat contracting power, and which uses an expansion pipe having a roller and a rotary plate to perform an artificial pressure- And more particularly, to a method of connecting a double insulated pipe using an expanded connection, a method of manufacturing the connection, and a manufacturing apparatus.

Generally, the district heating system differs from the individual heating system in which the user who supplies the collective energy individually lowers the heating facility by the system which supplies the collective energy through the piping to the heating and hot water supply to many individual users.

In other words, district heating does not have individual heating facilities such as houses, commercial buildings, offices, schools, hospitals, factories, etc. in a single city or a certain area, and a large-scale heat production facility, that is, a cogeneration power plant, (80 ~ 120 ℃), which is needed to supply electricity to the customers through the heat transfer pipe.

On the other hand, the cogeneration plant consists of a heat-only boiler, a heat storage tank, a heat exchanger and a circulation pump. The circulation pump is connected to a heat transfer pipe for transporting and recovering heat to the heat supply target area and a user heat exchanger. Here, the heat transfer pipe comprises a supply pipe and a return pipe. As such, double heat insulation pipes are mainly used for the heat transfer pipes buried in the ground for district heating.

Such a double insulated pipe comprises an inner pipe made of a steel pipe, an outer pipe having a large chemical resistance and high strength, and a heat insulating material (for example, polyurethane, heat insulating material) formed between the inner pipe and the outer pipe.

The double insulated pipe should not be leaked from the inner pipe and should not be exposed to external flooding through the exterior for at least 30 years. For this reason, it is required that the deformation of the double insulated pipe due to stress generation and expansion due to heat shrinkage occurs within the allowable range. It should be constructed.

The structural and construction requirements of these double insulation components are to be faithfully maintained, particularly where the double insulation is to be connected. In the process of connecting the double insulated pipe, the outer pipe of the double insulated pipe to be connected and the heat insulator are peeled to expose the inner pipe, and the inner pipe is mutually connected by welding. If the weld is completed and it is judged that there is no danger of leakage by testing the welded part, the pipe connection part is covered with the heat shrinkable sleeve and the urethane resin is filled in the connection part before the heat shrinkable sealing, . In addition to the heat shrinkable connection method, there are a shell joint connection method and a welding connection method.

The piping in the district heating is constituted so as to connect a plurality of double insulated pipes by welding or the like, usually with a predetermined depth on the ground. That is, a plurality of double insulated tubes of 20 mm to 1100 mm are buried in the ground to form a single section by connecting the tubes to each other by about 12 m, and a plurality of double insulated tubes are connected to each other at a predetermined interval, In a manner such that a section of the < RTI ID = 0.0 > At this time, a double insulated tube having a short length of usually 5 to 10 m or less is inserted into the parts spaced apart from each other by intervals, and the piping is made to be connected by welding or the like to the end of each section.

FIG. 1A is a perspective view of a double heat insulating pipe connecting method using a conventional heat shrinkable casing in which both ends of a double heat insulating pipe are welded. FIG. 1B is a perspective view showing a state in which a heat-shrinkable casing is positioned at a joint portion in a double heat insulation pipe connection method using a conventional heat shrinkable casing. 1C is a perspective view showing a state where both ends of a heat-shrinkable casing are heated by a torch in a double heat insulation pipe connection method using a conventional heat shrinkable casing. FIG. 1D is a perspective view illustrating a state in which polyurethane is filled in a forming hole of a heat-shrinkable casing closely adhered to a double heat insulating pipe connecting method using a conventional heat shrinkable casing.

As shown in FIGS. 1A to 1D, in the conventional method of connecting the connecting portions of the double insulated tubes with the connecting holes 10 made of the heat-shrinkable casings, the heat-shrinkable casing is first inserted into the double insulated tube 1, The heat shrinkable casings are welded (Fig. 1A), and then the heat shrink casings are moved to the center to be positioned at the connection sites (Fig. 1B). Then, the ends of the heat shrink casings are heated by using a torch, A forming hole is formed in the heat shrinkable casings and the foaming holes 5 formed in the heat shrinkable casings are filled with polyurethane foam (Fig. 1C) 6) solution was injected for 30 seconds to 60 seconds to release the gas and the foaming hole 5 was blocked for about 10 seconds. The hole of the polyurethane foam was clogged and the foaming was continued inside. After 24 hours, (5) Fours to clean and prevents the forming hole (5) wepseu. After that, the webs are fixed with a saddle, and then the webs are electrically fused.

However, when the conventional heat shrinkable casings are used to connect the double insulated tubes, there is a problem that the heat shrinkage force is not strong and the adhesion with the double insulated tubes is not large. That is, since the adhesive strength between the heat-shrinkable casings and the double insulated pipe is not high enough, it is difficult to tighten the watertightness, so that external stormwater or sewage may permeate, resulting in poor installation.

In addition, since a torch or the like is used to heat a conventional heat shrinkable casing, there is a problem that heat is not conducted uniformly and shrinkage is not completely performed, and a portion where fire is frequently brought into contact with the external appearance is burned or deformed Respectively.

Korea Patent Publication No. 2010-0088378

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide an apparatus and a method for controlling a pressure, The present invention provides a double insulated pipe connection method using an expanded connection pipe, which is capable of easily forming an expanded connection pipe and connecting a double insulation pipe more firmly, a method of manufacturing the connection pipe, and a manufacturing apparatus.

According to an embodiment of the present invention, a casing is manufactured by applying a raw material having an expansion / contraction force, a thermal restoration force, and a heat contracting force, and after the casing is extended, The present invention also provides a method of connecting a double insulated pipe using an enlarged connection port, which is capable of connecting a joint of a double insulated pipe so as to be more firmly and firmly attached to the existing insulation pipe.

According to an embodiment of the present invention, in the method of heating the connector, an electric welding method in which a hot-wire coil is installed on both ends of the inner surface of the connector is applied instead of a conventional torch application method, A method of manufacturing the connection port, and a manufacturing apparatus of the connection pipe using the expanded connection pipe which can solve the problem that the connection pipe is deformed, burned or partially heated by heating the connection pipe by hot air.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments with reference to the accompanying drawings.

It is an object of the present invention to provide an apparatus for expanding a casing for connection of a double heat insulating pipe joint, the apparatus comprising: an inner space heated horizontally on a support and heated to a predetermined temperature, This entering heating furnace; A plurality of rollers each having a rod-like shape whose one end is gradually reduced in diameter; Driving means provided at one side of the vertical frame to rotate each roller with respect to the longitudinal axis of the roller; A rotating plate connected to the driving means by a center shaft and having the other end of each of the plurality of rollers radially installed; Rotating means for rotating the rotating plate about a central axis; And a roller fixing plate fixed to the center shaft end and formed with a plurality of holes so that the pointed portions of the respective rollers are inserted into the holes to constrain the movement of the pointed portions of the respective rollers, The casing is inserted into a plurality of rollers, and the respective rollers are rotated by the driving means to adjust the casing in the direction of rotation of the rollers Wherein the raw material is made of a material having a restoring force to be contracted by heat, and the raw material is made of a material having restoring force to be contracted by heat.

The driving means may rotate the respective rollers about the longitudinal axis by a driving motor and a universal joint connected to each of the plurality of rollers.

The rotation plate is provided with a plurality of roller fixing holes in the form of elongated holes and a rotation guide hole for guiding rotation of the rotation plate so that the rollers can be positioned, and the rotation plate is installed. And a guide plate having a guide pin for guiding rotation of the guide plate.

Further, the rotating means may be characterized by rotating the handle by a handle having a pinion tooth formed on the outer surface of the steering shaft and a rack tooth formed on one side of the outer surface of the rotating plate to rotate the rotating plate in a rack and pinion manner .

A second object of the present invention is to provide a method for manufacturing a connecting port for connection of a double insulated pipe joint using the above-mentioned first expansion pipe, comprising the steps of providing a pipe having an inner diameter equal to the outer diameter of the double insulated pipe Or a small tubular raw material; Preparing a casing by cutting the raw material to a length corresponding to the length of the double heat insulating pipe joint; Setting a position by mounting a plurality of rollers on a rotary plate of an expanding machine; Attaching a roller fixing plate to restrain the sharp ends of the rollers; Rotating the rotating plate by a predetermined angle in a first direction which is a rotating direction with respect to the central axis of the rotating plate by rotating means; Fixing the casing such that a plurality of the roller ends are inserted into the inner surface of the casing; Rotating each of the rollers by the driving means in the first direction with respect to the longitudinal axis; The casing is expanded to produce a connector; And rotating the rotating plate by a predetermined angle in a second direction that is a direction opposite to the first direction by the rotating means and in a rotating direction with respect to the center axis of the rotating plate. As shown in Fig.

The method may further include moving the heating furnace by operating the air cylinder so that the casing is positioned in the heating furnace inner space.

Installing a hot wire on one side of the inner surface of the connector; And applying a welding agent to a surface to be joined with the connecting tube and the double insulated tube.

The fusing agent may be a hot melt or EVA.

A third object of the present invention is to provide a method of connecting a double insulation pipe joint using an expanded connector, comprising the steps of: manufacturing a connector expanded by the expansion method according to the second object; Welding a pair of tube ends to be connected, and positioning the expanded connector at a connection site; And a step in which heat is applied to both ends of the expanded connection port so that an end of the connection port is brought into close contact with the pipe due to the restoring force and contractive force of the connection port. . ≪ / RTI >

The method may further include, after the step of adhering, inserting the polyurethane foam into the hole formed at one side of the connecting pipe to cure the double insulating pipe joint, and in the closing step, And the heat is applied by applying heat to the hot wire provided on the inner surface of the connecting hole and by applying heat to the connecting end of the joining hole, And forming an adhesive layer while melting the applied adhesive on the surface of the adhesive layer.

Therefore, according to the embodiment of the present invention, as described above, it is possible to manufacture a connector having no defective rate, quicker, more accurate, and easier to expand without using an artificial pressure-applying process using a roller- It is possible to connect the double insulated pipe firmly.

According to an embodiment of the present invention, a casing is manufactured by applying a raw material having an expansion / contraction force, a thermal restoration force, and a heat contracting force, and after the casing is extended, It is possible to connect the joints of the double insulated pipes so as to be firmer and closer to the existing ones.

According to an embodiment of the present invention, in the method of heating the connector, an electric welding method in which a hot-wire coil is installed on both ends of the inner surface of the connector is applied instead of a conventional torch application method, The connector is heated by hot air to heat the connector, thereby deforming, burning or partially heating the connector.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, those skilled in the art will readily appreciate that various other modifications and variations can be made without departing from the spirit and scope of the present invention.

FIG. 1A is a perspective view illustrating a state in which both ends of a double insulated pipe are welded in a double insulated pipe connection method using a conventional heat shrinkable casing,
FIG. 1B is a perspective view showing a state in which a heat-shrinkable casing is positioned at a joint portion in a double heat insulation pipe connection method using a conventional heat shrinkable casing,
FIG. 1C is a perspective view showing a state in which both ends of a heat-shrinkable casing are heated by a torch in a double heat insulation pipe connection method using a conventional heat shrinkable casing,
FIG. 1D is a perspective view illustrating a state in which polyurethane is filled in a forming hole of a heat-shrinkable casing closely attached in a double heat insulating pipe connecting method using a conventional heat shrinkable casing,
FIG. 2 is a perspective view of a connector according to an embodiment of the present invention and a connector expanded by an expanding method according to an embodiment of the present invention; FIG.
3 is a cross-sectional view of an expanded connector according to an embodiment of the invention,
FIG. 4 is a flow chart of a method of manufacturing a connector for connecting a double heat insulating pipe joint according to an embodiment of the present invention;
FIG. 5 is a side view showing the configuration of an expansion unit having a roller rotary plate according to an embodiment of the present invention;
6 is a front view of a rotating plate according to an embodiment of the present invention;
7A is a side view of a roller fixed to a roller fixing hole of a rotating plate according to an embodiment of the present invention,
7B is a side view and an enlarged end view of a roller fixed to a roller fixing hole of a rotating plate according to another embodiment of the present invention,
8A is a front view of a rotating plate provided with a plurality of rollers according to an embodiment of the present invention,
8B is a plan view of a fixing plate for fixing a plurality of rollers according to an embodiment of the present invention,
8C is a front view of the rotating plate in a state in which the rotating plate is rotated in the first direction according to an embodiment of the present invention;
Fig. 9 is a side view of Fig. 8B taken along the A direction,
10 is a front view of a rotating plate in a state in which the rotating plate is rotated in the second direction according to an embodiment of the present invention;
FIG. 11 is a side view of FIG. 10 viewed from direction B,
FIG. 12 is a perspective view illustrating a state in which a connector according to an exemplary embodiment of the present invention is located at a connecting portion of a double heat insulating pipe joint;
13 is a partial sectional view of Fig. 12,
FIG. 14 is a perspective view illustrating a state in which an end of a connector is heated by a hot air blowing method according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the detailed description of known functions and configurations incorporated herein will be omitted when it may unnecessarily obscure the subject matter of the present invention.

The same reference numerals are used for portions having similar functions and functions throughout the drawings. Throughout the specification, when a part is connected to another part, it includes not only a case where it is directly connected but also a case where the other part is indirectly connected with another part in between. In addition, the inclusion of an element does not exclude other elements, but may include other elements, unless specifically stated otherwise.

Hereinafter, a manufacturing method and an apparatus for manufacturing the expanded connector 10 for connection of the double insulated tube 1 according to an embodiment of the present invention will be described. The connection method of the double insulated tube 1 using the expanded connector 10 manufactured according to one embodiment of the present invention will be described.

First, in order to manufacture the expanded connector 10, a tubular raw material should be prepared. The inner diameter of the raw material is preferably equal to or slightly smaller than the outer diameter of the double insulated tube 1 to be connected. In addition, the characteristics of these raw materials should be such that they have heat shrinkage force which is contracted by heat, simultaneously with stretching force capable of expanding at the same time, and at the same time, restoring force which is restored before expansion when heat is applied. In the specific embodiment of the present invention -HDPE was used.

That is, for example, when the outer diameter of the double insulated pipe 1 is about 210 mm, a raw material having an inner diameter of about 200 mm is produced. As will be described later, according to the embodiment of the present invention, The inner diameter of the connector 10 is increased to about 250 mm and the inner diameter of the connector 10 is 200 mm by the restoring force when heat is applied to the connector 10, It is possible to obtain the inner diameter of the outer ring.

FIG. 2 shows a perspective view of a casing 3 according to an embodiment of the present invention and a connector 10 expanded by an expanding method according to an embodiment of the present invention. According to one embodiment of the present invention, the casing 3 is manufactured by cutting the tubular raw material to a length corresponding to the length of the joint 2 of the double insulated tube 1. [

Then, as will be described later, the casing 3 is enlarged to make the connector 10 by the expanding method and the expanding machine according to the embodiment of the present invention. A coil-shaped hot wire 11 and a bonding agent 12 may be applied to both ends of the inner surface of the connector 10.

3 illustrates a cross-sectional view of an expanded connector 10 in accordance with one embodiment of the present invention. As shown in FIG. 3, in order to place the connector 10, which is later expanded, in the connecting portion of the double insulated tube 1 and apply heat to the connector 10 expanded by the electric fusion method, The coil of the hot wire 11 is installed on each of the inner and outer surfaces of the inner and outer surfaces.

Further, the fusion bonding agent 12 is applied to both ends of the inner surface of the expanded connection port 10. When the heat is applied to the connector 10 by external heat or electric fusion, the adhesive agent 12 forms an adhesive layer on the contact surface between the connector 10 and the double insulated tube 1 while melting, Permeable, and can completely block rainwater or sewage. In the embodiment of the present invention, such a melt adhesive 12 uses hot melt or EVA.

Hereinafter, a method of expanding and expanding a roller 3 having a roller rotating plate for manufacturing a connector 10 which is expanded in accordance with an embodiment of the present invention will be described. FIG. 4 is a flowchart illustrating a method of manufacturing a connector 10 using an expanding device for connecting a double insulation device 1 according to an exemplary embodiment of the present invention. Referring to FIG. First, as described above, a tubular raw material having an inner diameter equal to or smaller than the outer diameter of the double heat insulating tube 1 having heat shrinkability, stretchability, and restoring force is manufactured (S1), and the raw material is joined to a double heat insulating tube (1) The casing 3 is cut by a length corresponding to the length of the portion 2 (S2).

5 is a side view showing a configuration of an expansion unit 100 having a roller rotary plate according to an embodiment of the present invention. An expansion unit 100 having a roller rotation plate according to an embodiment of the present invention is an apparatus for expanding a casing for connection of a double heat insulating pipe joint and includes a support 110, a heating furnace 140, a plurality of rollers 160 ), A rotating plate 170, a driving means, a rotating means, a fixing plate 180, and the like.

The heating furnace 140 has an inner space heated horizontally on the support 110 and heated to a predetermined temperature by heating with glycerol or a far infrared heater so that the casing enters the inner space during the expanding operation. In the specific embodiment, the support cylinder 110 is provided with an air cylinder 130 to move the heating furnace 140.

6 shows a front view of a rotating plate 170 according to an embodiment of the present invention. 7A is a side view of the roller 160 fixed to the roller fixing hole 172 of the rotary plate 170 according to an embodiment of the present invention.

As shown in Fig. 7A, the roller 160 is formed in the form of a rod having a shape in which one end is gradually reduced in diameter. The roller 160 is fixed to the roller fixing hole 172 of the rotary plate 170. The driving means includes a gear box 150 provided at one end of the vertical frame 120 provided in the support base 110 and having a motor therein, and the respective rollers 160 are arranged in a specific direction As shown in FIG.

7B is a side view and an enlarged end view of a roller fixed to a roller fixing hole of a rotating plate according to another embodiment of the present invention. 7B, the end portion of the roller 160 may be formed between the sharp point portion 161 and the body, may further include a tapered portion 164 whose diameter is reduced toward the end side, And a smooth portion 163 is provided between the beak 161 and the beak 161 so that the diameter of the beak 161 is reduced in two stages. Thus, as the end of the roller 160 has a stepwise reduced diameter, each roller 160 is rotated about the longitudinal axis, as will be described later, to more quickly and efficiently expand the casing .

6, the rotating plate 170 is connected to the driving means by the center shaft 151, and the other end of each of the plurality of rollers 160 is radially installed. The rotating means is configured to rotate the rotating plate 170 with respect to the center axis 151.

Therefore, after rotating the rotary plate 170 in a specific direction by the rotary unit in a state where the roller 160 is not rotated by these arrangements, the casing is fixed to the plurality of rollers 160, To rotate the respective rollers 160 to manufacture the connector by enlarging the casing. Also, as mentioned above, the raw material is composed of a material having a restoring force that contracts when heat is applied.

Hereinafter, the method of expanding the dilation unit 100 and the construction of the dilation unit 100 will be described in more detail. As shown in FIG. 6, the supporting frame 110 is provided with a vertical frame 120, and the vertical frame 120 is provided with a driving unit. A fixing plate 180 and a rotating plate 170 are provided on the central axis 151 of the driving means and a roller fixing plate 190 is fixedly installed on the end of the center axis 151.

 First, a plurality of rollers 160 are radially installed in a roller fixing hole 172 formed in a rotary plate 170 (S3). 8A shows a front view of a rotating plate 170 provided with a plurality of rollers 160 according to an embodiment of the present invention. 8A, the roller fixing hole 172 formed in the rotary plate 170 has a shape of a long hole, and a plurality of rollers 160 are fixed to the roller fixing holes 172 at positions corresponding to the inner diameter of the casing The fastening member 162 and the like.

After the plurality of rollers 160 are installed on the rotary plate 170, the roller fixing plate 190 restricts the movement of the roller 160 on the side of the sharp point 161 (S4). 8B is a plan view of the roller fixing plate 190 according to an embodiment of the present invention. 8B, a plurality of insertion holes 191 are radially formed in the roller fixing plate 190, and it can be seen that the roller fixing plate 190 may have various shapes depending on the inner diameter of the casing and the installed position of the roller 160 have. The roller fixing plate 190 is fixed to the end of the center shaft 151 so that the pointed portion 161 of each of the rollers 160 is inserted into the insertion hole 191 formed in the roller fixing plate 190. Therefore, the rotation is restrained on the pointed portion 161 side of the roller 160 provided on the rotary plate 170.

Then, the rotating plate 170 is rotated in the first direction by the rotating means in the first predetermined direction (S5). 8C is a front view of the rotary plate 170 in a state where the rotary plate 170 is rotated in the first direction according to an embodiment of the present invention. FIG. 9 is a side view of FIG. 8C taken along the direction A of FIG. As shown in FIGS. 8C and 9, it can be understood that the first direction refers to the counterclockwise direction with respect to the center axis 151.

8C, when the rotary plate 170 is rotated in the first direction by the rotation means, the ends of the sharp points 161 of the rollers 160 are rotated by the roller fixing plate 190 It can be seen that each of the rollers 160 is tilted at a predetermined angle in the rotating direction.

8C, a plurality of rotation guide holes 171 are formed on the outer circumferential side of the rotary plate 170. The guide pins 181 inserted into the rotation guide holes 171 And the rotation of the rotary plate 170 can be guided.

Further, in the concrete embodiment of the present invention, it is preferable to rotate the rotary plate 170 in a rack and pinion manner. 8C, the steering shaft of the handle is provided with threaded pinion teeth 184, and a rack tooth 173 is formed on one side of the side surface of the rotary plate 170. The pinion and the rack are engaged with each other , And that the rotating plate 170 is rotated when the handle is rotated in a specific direction.

Then, the casing 3 is inserted into the roller fixing plate 190 (S6). After the end of the casing 3 is inserted into the roller fixing plate, the driving means rotates each of the rollers 160 in the first direction with respect to the longitudinal axis (S7). At this time, the direction in which the roller 160 is rotated should be the same as the direction in which the rotation plate 170 is rotated. Thus, each of the tilted rollers 160 rotated in the first direction by a predetermined angle is rotated in the first direction with respect to the longitudinal axis, so that the casing is pushed inward by the threading principle (left side from the right side in FIG. 9) The casing is enlarged (S8).

Further, the driving means rotates the respective rollers 160 on the basis of the longitudinal axis by the driving motor and the universal joint 152 connected to each of the plurality of rollers 160. In this expansion process, the preheated heating furnace 140 is moved by using the air cylinder 130 so that the casing 3 is inserted into the heating furnace 140, When the heat is gradually applied (for example, 130 to 150 ° C), the casing 3 is enlarged to manufacture the connector 10 which is expanded.

In addition, the expander 100 having the roller rotation plate according to the embodiment of the present invention can automatically release the expanded connector from the roller 160. [ 10 is a front view of the rotary plate 170 in a state in which the rotary plate 170 is rotated in the second direction according to an embodiment of the present invention. FIG. 11 is a side view of FIG. 10 viewed in the direction of arrow B. FIG.

10 and 11, when the expansion is completed and the connector is manufactured, the rotary plate 170 is rotated in the second direction opposite to the first direction (the center axis 151 of the rotary plate 170 ) In the clockwise direction) (S9). In this case, for example, if the rotary plate 170 is moved by about 15 ° in the first direction, the rotary plate 170 is rotated about 30 ° in the second direction after the expansion. Thus, each of the rollers 160 is tilted in the opposite direction to the expanding process.

When the rotary plate 170 is rotated in the second direction, the connection hole expanded automatically by the threading principle is released while being moved to the outside (from the left side to the right side in reference to FIG. 11).

After the widened connection 10 is quenched by cooling water or the like to remove water and then the hot melt 11 and the hot melt adhesive 12 made of EVA or the like are applied to both ends of the inner surface as described above .

The expanded connection 10 made by the above-mentioned method will be used to connect the double insulation 1 connection 2. FIG. 12 is a perspective view illustrating a state in which a connector 10 according to an embodiment of the present invention is positioned at a connecting portion of a double heat insulating pipe joint 2. 13 shows a partial sectional view of Fig.

As shown in FIG. 12, it can be seen that the ends of the joints 2 of the pair of double insulated tubes 1 are welded, and the expanded joints 10 are moved to the joint side. When heat is applied to both ends of the connector 10 from the outside or electric power is applied to the coil of the hot wire 11 provided at both ends of the inner surface of the connector 10, a restoring force is generated in the connector 10, And the heat shrinkage force acts to shrink more than before the expansion, so that the joining portion 2 of the double insulated tube 1 is completely tightly fixed.

13, the adhesive agent 12 described above is applied to both ends of the inner surface of the connector 10 so that the adhesive layer 12 is formed on the contact surface between the connector 10 and the double insulated tube 1 while being melted by the applied heat. It is possible to increase the adhesion and to completely block externally permeable stormwater or wastewater.

FIG. 14 is a perspective view illustrating a state in which an end portion of the connector 10 is heated by a hot air blowing method according to an embodiment of the present invention. Heat can be applied to the connection port 10 by using a separate hot air supply member 60 as shown in FIG. 14 as well as the electric fusion welding method using the hot wire 11 coil.

As shown in FIG. 14, the hot air supply member 60 according to the embodiment of the present invention is installed outside the connection hole 10 and has holes 61 for supplying a plurality of hot air to both ends thereof. Therefore, hot air is applied to the holes 61 by a hot air blower to heat the connector 10.

The conventional heat application method uses a torch. When such a torch is used, since the heat is not uniformly conducted to the surface of the connection hole 10, the shrinkage is not completely performed, Or deformed. However, when the heating method according to the embodiment of the present invention described above is adopted, such a problem can be solved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. It is to be understood that such modified embodiments are within the scope of protection of the present invention as defined by the appended claims.

1: Double insulated tube
2: joint
3: Casing
4: glycerin
5: Forming hole
6: Polyurethane
10: Connector
11: Heat line
12: Fusing agent
60: Hot air supply member
61: hole
100: Expansion
110: Support
120: vertical frame
130: Air cylinder
140: heating furnace
150: Gear box
151: center axis
152: Universal joint
160: Roller
161: Sharp
162: fastening member
163:
164:
170:
171: Rotation guide hole
172: roller fixing hole
173: Rack tooth
180: Fixed plate
181: Guide pin
182: Operation handle
183: Steering axis
184: Pinion tooth
190: Roller fixing plate
191: Insertion hole

Claims (11)

An apparatus for expanding a casing for connection of a double heat insulating pipe joint,
A heating furnace capable of horizontally moving on a support, having an internal space heated to a preset temperature, and a casing entering the internal space during an expanding operation;
A plurality of rollers each having a rod-like shape whose one end is gradually reduced in diameter;
Driving means provided at one side of the vertical frame to rotate each roller with respect to the longitudinal axis of the roller;
A rotating plate connected to the driving means by a center shaft and having the other end of each of the plurality of rollers radially installed;
Rotating means for rotating the rotating plate about a central axis; And
And a roller fixing plate having a center fixed to the center shaft end and a plurality of holes formed therein so that a pointed portion of each of the rollers is inserted into the hole to constrain the movement of the pointed portion of each of the rollers,
The casing is inserted into a plurality of rollers after rotating the rotating plate in a specific direction by the rotating means in a state in which the roller is not rotated and each of the rollers is rotated by the driving means, And the raw material of the casing is made of a material having a restoring force to be contracted by heat.
delete delete The method according to claim 1,
A plurality of roller fixing holes in the form of elongated holes and a plurality of rotation guide holes for guiding rotation of the rotation plate are formed on the rotation plate,
Further comprising a fixing plate on which the rotation plate is installed and having a guide pin inserted in the rotation guide hole to guide rotation of the rotation plate.
The method according to claim 1,
The rotating means
Wherein the handle is rotated by a handle having a pinion tooth on the outer surface of the steering shaft and a rack tooth formed on one side of the outer surface of the rotating plate to rotate the rotating plate in a rack and pinion manner.
A method for manufacturing a connection for a connection of a double insulation pipe joint using the expansion unit of claim 1,
Preparing a tubular raw material having heat shrinkability and stretchability and having an inner diameter equal to or smaller than an outer diameter of the double heat insulating tube;
Preparing a casing by cutting the raw material to a length corresponding to the length of the double heat insulating pipe joint;
Setting a position by mounting a plurality of rollers on a rotary plate of an expanding machine;
Attaching a roller fixing plate to restrain the sharp ends of the rollers;
Rotating the rotating plate by a predetermined angle in a first direction which is a rotating direction with respect to the central axis of the rotating plate by rotating means;
Fixing the casing such that a plurality of the roller ends are inserted into the inner surface of the casing;
Rotating each of the rollers by the driving means in the first direction with respect to the longitudinal axis;
The casing is expanded to produce a connector; And
And rotating the rotation plate by a predetermined angle in a second direction which is a direction opposite to the first direction and is a rotation direction with respect to the center axis of the rotation plate by the rotation means. How to expand using.
The method according to claim 6,
Further comprising the step of moving the heating furnace by the operation of the air cylinder so that the casing is positioned in the heating furnace inner space.
The method according to claim 6,
Installing a hot wire on one side of the inner surface of the connector; And
Further comprising the step of applying a sealant to the surface to be bonded to the connector and the double insulated tube.
9. The method of claim 8,
Wherein the melt adhesive agent is hot melt or EVA.
In the connecting method of the double insulation pipe joint using the expanded connection,
10. A method of manufacturing a connector, the method comprising: fabricating a connector that is expanded by an expanding method according to any one of claims 6 to 9;
Welding a pair of tube ends to be connected, and positioning the expanded connector at a connection site; And
And applying heat to both ends of the expanded connection pipe so that an end of the connection pipe is brought into close contact with the pipe by a restoring force and a contracting force of the connection pipe.
11. The method of claim 10,
After the adhesion step,
Inserting the polyurethane foam into the hole formed at one side of the connector and curing the insulation to insulate the double insulation pipe joint,
In the adhering step,
A heat is applied to an end portion of the connection port by a heating device provided on the outside or electricity is applied to a heat line installed on an inner surface of the connection port to apply heat,
The step of adhering
Further comprising the step of forming an adhesive layer while dissolving the adhesive agent applied on the surface of the connecting end and the double insulated pipe by heat applied to the end of the connecting end, Way.

Images