KR100712646B1 - Welding method for air gap pipe, connecting pipe and welding machine for air gap pipe - Google Patents

Abstract

The present invention is to provide a pipe fusion method for increasing the bonding force during fusion of a pipe having a void structure between the inner wall and the outer wall, and to provide a connection pipe and a pipe fusion apparatus for realizing the same.

The present invention for achieving the above object is a pipe alignment step of mounting a cylindrical connecting pipe filled between the first pipe, the second pipe and the first pipe, the second pipe is formed between the inner wall and the outer wall; A heating step of heating end surfaces of the first pipe, the second pipe, and the connection pipe; It has a technical feature including a joining step of joining by welding the cross-sections.

Pipe, Heat Fusion, Clamp, Cylinder, Airgap

Description

Welding method for air gap pipe, connecting pipe and welding machine for air gap pipe}

1 is a perspective view showing one form of a pipe having a conventional air gap structure.

2 is a configuration diagram for explaining a pipe fusion method of the present invention.

3 is a perspective view of one embodiment of the apparatus of the present invention.

4 is a front view of FIG. 3.

5 is a configuration diagram illustrating an operation process of an embodiment of the present invention.

6 is a block diagram showing a coupling process according to an embodiment of the present invention.

7A illustrates a process in which a pipe is mounted on a clamp applied to an embodiment of the present invention, and FIG. 7B is a cross-sectional view illustrating a state in which a pipe is mounted on a clamp in an embodiment of the present invention.

8 is a perspective view showing another embodiment of the connecting pipe of the present invention.

The present invention relates to a pipe fusion method for fusing and joining end surfaces of pipes having voids between an outer wall and an inner wall, a connection pipe and a fusion method used therein.

Pipes are used for various purposes such as gas pipes, water pipes and sewage pipes, and pipe pipes of various structures are manufactured according to the intended use. Conventional pipes are filled with a pipe material between the inner and outer circumferential surfaces, but in order to save the pipe material, the pipe shown in FIG. 1 was developed and started to be mainly used for sewage pipes.

1 is a perspective view showing one form of a pipe having a conventional air gap structure.

The air gap pipe consists of a cylindrical inner wall (2) and an outer wall (1) formed at regular intervals from the inner wall, and a partition wall (3) joining them to the inner wall (2), outer wall (1) and partition wall (3). The enclosed space forms voids. At this time, the partition 3 is formed spirally in the longitudinal direction to have durability.

When the end face of the pipe of such a pore structure is heated by a heater to join the mating surfaces, the contact areas of the mating surfaces are significantly reduced compared to the pipe tubes filled with the pores. Therefore, such pipes are manufactured by the fusion device shown in Patent Registration No. 456613 to which the applicant is the owner, and the fusion machine (model name: selding-315A, selding 400A) of Semin Electronics Co., Ltd., to which these invention technologies are applied. When fusion and bonding are combined, the bonding force is weakened and the bonding portion is separated after the bonding construction.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and to provide a pipe fusion method for increasing the bonding force at the time of fusion of the pipe having a void structure between the inner wall and the outer wall, and to provide a connection pipe and pipe fusion device for realizing the same. .

The present invention for achieving the above object is provided between the first pipe (4), the second pipe (5), the first pipe (4), the second pipe (5) is formed between the inner wall and the outer wall A pipe alignment step of aligning connecting pipes (6) formed between the inner wall and the outer wall of voids having a void area smaller than the void area of the first pipe (4) and the second pipe (5); A heating step of heating contact end surfaces of the first pipe (4), the second pipe (5), and the connection pipe (6); It comprises a coupling step of pressing by pressing the contact end surfaces.

Another feature of the present invention is that the first pipe between the first pipe (4), the second pipe (5), the first pipe (4), the second pipe (5) is formed between the inner wall and the outer wall (4), A pipe fusion apparatus having a gap in which pores having a pore area smaller than that of the second pipe 5 joins the connecting pipe 6 formed between the inner wall and the outer wall by thermal fusion: Fixing clamps 10 and 20 to which the first pipe 4 is mounted and fixed to the frame; A connection clamp 30 to which the connection pipe 6 is mounted; Moving clamps 40 and 50 on which the second pipe 5 is mounted; Guide rods 110 and 120 which are fixed to the fixing clamps 10 and 20 and penetrate the connection clamp 30 and the movable clamps 40 and 50; The protrusions 111 'and 121' are inserted into the outer circumferential surfaces of the guide rods 110 and 120 and one end is fixed to the connection clamp 30, and the other ends and the protrusions 111 'and 121' are bent outwardly. It includes moving rods 111, 121 to move the movement clamp 40 along the outer circumferential surface between one end, the movement clamp 40, 50 is coupled to the cylinder 81, 82, It is moved by the movement of the cylinders 81 and 82.

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Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2 is a configuration diagram for explaining a pipe fusion method of the present invention.

In FIG. 2, a connecting pipe 6 filled with a pipe wall is disposed between the first pipe 4 and the second pipe 5 having a gap between the inner wall and the outer wall, and the cross sections of the pipes are first chamfered and then placed on the cross section. The heater plate is installed to be in contact so that the end face is heated, and then the heater plate is removed, and the pipes are fused and joined by pressing the heated end faces.

The size of the contact area when the first pipe 4 of the void structure is joined by the connection pipe 6 of the filling structure is much larger than the contact area when the pipes of the void structure are directly contacted and fused, thereby resulting in a poor defect rate of fusion. This is greatly reduced.

3 is a perspective view of one embodiment of the apparatus of the present invention, and FIG. 4 is a front view of FIG.

In the pipe fusion apparatus shown in FIG. 3, the pipes are mounted on clamps 10, 20, 30, 40, and 50 that can be separated into upper and lower surfaces. Fixed clamps 10, 20, on which the first pipe 4 with a void structure is mounted, are fixed to the frames 60, 61, and movements on which the second pipe 5 with a different void structure is mounted. The clamps 40 and 50 are capable of reciprocating relative to the frames 60 and 61, and the connecting clamp 30 is equipped with a connecting pipe 6, and the movable clamps 40 and 50 are By the reciprocating motion, the fixing clamps 10 and 20 are moved closer or further away from each other.

One end of the cylinder rods 71, 72 is coupled to both sides of the fixed clamp 20, and the cylinders 81, 82 reciprocating around the cylinder rods 71, 72 reciprocate. work out. In addition, the cylinders 81 and 82 are fixed to both sides of the lower surfaces 41 and 51 of the movable clamps 40 and 50 to center the cylinder rods 71 and 72 by hydraulic pressure. As the cylinders 81 and 82 reciprocate, the movable clamps 40 and 50 also reciprocate with respect to the fixed clamps 10 and 20.

In addition, the guide rods 110 and 120 penetrate both sides of the lower surfaces of the fixed clamps 10, 20, the connection clamps 30, the movable clamps 40, and 50. At this time, the lower surfaces 11 and 21 of the fixing clamps and the guide rods 110 and 120 are fastened.

In addition, the outer rods of the guide rods 110 and 120 are inserted into the movable rods 111 and 121, which slide with respect to the guide rods 110 and 120, and the movement positions of the movable rods 111 and 121. Stoppers 112 and 122 are provided for limiting the limit. The moving rods 111 and 121 are formed in a cylindrical shape inserted into the guide rods 110 and 120, and at one end, protrusions 111 'and 121' protruding outward are formed, and the other end is connected. It is fixed to the clamp 30, the outer peripheral surface of the protrusions 111 ', 121' inside the movable clamp 40 is installed and slides along the outer peripheral surface. In addition, the lower surface 11 of the fixed clamp 10 is coupled to the frame 60, the lower surface 21 of the fixed clamp 20 is coupled to the frame 61, the frame 60 and the frame 61 It is coupled by the gap adjusting rod 62, the gap can be adjusted by stretching, compressing the gap adjusting rod 62. In addition, the bent portion 63 is vertically formed at the end of the frame 61 to limit the moving distance of the moving clamp 50.

In addition, the upper and lower surfaces of the clamps (10), (20), (30), (40), (50) are hinged to rotate the guide rods 120 as the rotation axis, guide rods ( 120, the upper surface can be opened and closed with respect to the lower surface. To open, loosen the fastening bolts 91, 92, 93, 94, and 95 and fasten the fasteners 131, 132, 133, 134, and 135. After converting the horizontal state from the vertical state of 3, the upper surface is rotated around the guide rod (120).

In addition, since the movable clamp 40 and the movable clamp 50 are fixed by the fastening rod 64, the movable clamp 40 and the movable clamp 50 reciprocate together by the cylinders 81 and 82.

5 shows only the main components related to pipe movement in order to explain the operation of an embodiment of the present invention.

 The fusion of the pipe consists of a chamfering process, a heating process and a joining process, but the operation of the fusion device in the chamfering process and the heating process is similar, so the heating process and the joining process will be described.

Fixing clamp 10 such that the first pipe 4, the second pipe 5 and the connecting pipe 6 having voids have a gap in which the heaters 7, 8 can be inserted, as shown in FIG. 5. ), (20), the connecting clamp 30, the moving clamps (40), the pipes 50 are mounted, the heater 7 is installed between the end surface of the first pipe (4) and the connecting pipe (6) The heater 8 is installed between the connecting pipe 6 and the second pipe 5. At this time, the interval between the heater (7), (8) and the end surface of the pipe (4), (5), (6) as shown in Figure 5a, the stopper 112, 122 and the moving rod 111 The projections 111 'and 121' at the ends of, 121 are in contact with each other.

When the cylinders 81 and 82 are moved from right to left to contact the heaters 7 and 8 with the pipes 4, 5, and 6, the movement is fixed to the cylinder and moves with the cylinder. As the clamps 40 and 50 also move from the right to the left, the end surface of the second pipe 5 comes into contact with one surface of the heater 8 as shown in FIG. 5B. In this process, the moving clamp 40 slides along the outer circumferential surfaces of the moving rods 111 and 121. If the cylinders 81 and 82 are continuously moved from the right to the left, the moving clamps 40 and 50 are also moved from the right to the left, so that the other side of the heater 8 and one cross section of the connecting pipe 6 are eventually moved. It will be in the state of FIG. 5C in contact. When the moving rods 111 and 121 do not move from the right to the left until the state of FIG. 5C, but the cylinders 81 and 82 continue to move from the right to the left in the state of FIG. 5C, the moving clamps 40 and ( 50 is also moved from the right to the left, and there is no gap between the moving clamp 40 and the connecting pipe 6 so that the connecting pipe 6 is pushed from the right to the left and is fixed to the connecting pipe 6. Moving rods 111 and 121 are also moved from right to left.

When the cylinders 81 and 82 continuously move from right to left in the state of FIG. 5C, the state of FIG. 5D is brought into contact with one side of the heater 7 and the other end surface of the connecting pipe 6. Thus, as the cylinders 81 and 82 move, the cross section of the first pipe 4 comes into contact with the other surface of the heater 7 to reach the state of FIG. 5E. From the state of FIG. 5C to the state of FIG. 5E, as the connection clamp 30 moves, the movable rods 111 and 121 also move together.

In such a state, by applying electricity to the heaters 7 and 8, the end surfaces of the pipes 4, 5, and 6 are heated and melted, and then the cylinders 81 and 82 are moved from left to right. The pipes 4, 5 and 6 are separated in the reverse order shown in FIG. 5 and the heaters 7 and 8 are removed.

In the state where the heaters 7 and 8 are removed, the pipes are coupled by the process as shown in FIG. 6.

  FIG. 6A illustrates a state in which the heater is removed from FIG. 5E, and FIG. 6B illustrates that the cylinders 81 and 82 move from the right to the left, and the moving clamps 40 and 50 move from the right to the left. The end surface of the second pipe 5 is in contact with one end surface of (6), and FIG. 6C shows that the cylinders 81 and 82 move from the right to the left in the state of FIG. , The movable clamps 40 and 50 move from the right to the left, and the other end surface of the connecting pipe 6 is in contact with the end face of the first pipe 4 and the end faces of the pipes are fusion-bonded in this state. .

In addition, the pipe applied in one embodiment of the present invention is mainly used in sewage pipes having a structure having a void. The sewage pipe is based on the inner diameter, unlike the gas and water pipes in which the standard product is determined based on the outer diameter, and the deviation of the outer diameter is more severe than that of the gas and water pipes. Therefore, the structure of the clamp designed with a uniform radius of curvature makes it difficult to accurately seat the pipe for sewer pipe use.

7A illustrates a process in which a pipe is mounted on a clamp applied to an embodiment of the present invention, and FIG. 7B is a cross-sectional view illustrating a state in which a pipe is mounted on a clamp in an embodiment of the present invention.

7A and 7B show only the lower surface 11 of the clamp, and the cushioning protrusion 11 'protrudes from the lower surface 11 contacting the first pipe 4, so that the pipe is mounted on the pipe when the pipe is mounted. By applying pressure, the first pipe 4 does not flow even if it is not completely in contact with the clamp.

7 illustrates that the buffer protrusion 11 ′ is formed on the lower surface 11 of the clamp, but the upper surface 12, the lower surface 11, or one surface may be formed. It is preferable in the manufacturing process to form only in the lower surface 11 because it is distributed.

In addition, in the above embodiment, the method of heating the cross section by the plate-shaped heater was described, but the present invention is also applied to a method in which the cross section is first contacted, the molten material is wound on the outside of the welded pipe, and heated and bonded by heating. The scope of the present invention is defined by the following claims.

8 is a perspective view illustrating another embodiment of a connecting pipe applied to the present invention.

In the embodiment shown in FIG. 2, the connecting pipe is made of a pipe material-filled structure, but in this embodiment, when the connecting pipe is installed between the pipes of the air gap structure and pressed after heating, the diameter of the pipe of the air gap structure is small In this case, there is a fear that the pipe cross section of the void structure collapses.

In the embodiment shown in Fig. 8, a gap is formed in the wall between the inner circumferential surface and the outer circumferential surface of the connecting pipe. However, the pores formed in the wall is divided into a plurality of compartments so that the area of the pores on the pipe cross section is smaller than the area of the pores connected to the connecting pipe. Therefore, when the connection pipes are connected using these pipes, the contact area can be increased when connecting only the pipes of the air gap structure, so that the connection area can be strengthened, and the contact parts of the pipes of the air gap structure can be prevented from being collapsed when crimped. Can be.

In the modified embodiment illustrated in FIG. 8, a void structure may be formed only by a predetermined length from both end surfaces of the connection pipe, and the wall of the central portion may be filled, and various modifications may exist.

According to the present invention having the above object and configuration, it is possible to consolidate the connection by joining pipes having a very small contact area by using a connection pipe having a larger contact area, and combining two connecting parts at once with one system. By combining, the joining process can be simplified and the time required can be greatly reduced.

Claims (9)

The first pipe 4, the first pipe between the first pipe 4, the second pipe 5, the first pipe 4, and the second pipe 5 having voids formed between the inner wall and the outer wall. A pipe alignment step of aligning the connecting pipe 6 formed between the inner wall and the outer wall of the voids having a void area smaller than the void area of the two pipes 5; A heating step of heating contact end surfaces of the first pipe (4), the second pipe (5), and the connection pipe (6); And a joining step of pressurizing and contacting the contact end surfaces. The method of connecting a pipe having voids according to claim 1, wherein the void area of said connecting pipe is zero. The first pipe 4, the first pipe between the first pipe 4, the second pipe 5, the first pipe 4, and the second pipe 5 having voids formed between the inner wall and the outer wall. In a pipe fusion apparatus having air gaps in which air gaps having a pore area smaller than the air gap area of two pipes 5 join a connecting pipe 6 formed between an inner wall and an outer wall by thermal fusion: Fixing clamps 10 and 20 to which the first pipe 4 is mounted and fixed to the frame; A connection clamp 30 to which the connection pipe 6 is mounted; Moving clamps 40 and 50 on which the second pipe 5 is mounted; Guide rods 110 and 120 which are fixed to the fixing clamps 10 and 20 and penetrate the connection clamp 30 and the movable clamps 40 and 50; The protrusions 111 'and 121' are inserted into the outer circumferential surfaces of the guide rods 110 and 120 and one end is fixed to the connection clamp 30, and the other ends and the protrusions 111 'and 121' are bent outwardly. Comprising one of the movable rods 111, 121 to move the movable clamp 40 along the outer peripheral surface between one end, The moving clamps (40) and (50) are coupled to the cylinders, and the pipe fusion apparatus having a void, characterized in that moved by the movement of the cylinders (81, 82). 4. The pipe welding device according to claim 3, wherein the void area of said connecting pipe (6) is zero. According to claim 3 or 4, The guide rods 110, 120 is characterized in that the stopper 112, 122 for limiting the moving distance of the movable rods 111, 121 is installed Pipe fusion apparatus having a void. The method according to claim 3, wherein when the first pipe 4, the connecting pipe 6, and the second pipe 5 are spaced apart from each other, the cylinders 81 and 82 are moved by the movement of the cylinders 81 and 82. The movement clamps 40 and 50 are moved, the cross section of the second pipe 5 is brought into contact with the cross section of the connecting pipe 6 by the movement of the movement clamps 40 and 50, In the state where the cross section of the connecting pipe 6 and the cross section of the second pipe 5 are in contact with each other, the movable clamps 40 and 50 continue to move so that the second pipe 5 is connected to the connecting pipe 6. Pushing the pipe fusion device with a gap, characterized in that the connection clamp 30 is moved. 4. The buffer protrusion 11 ′ of claim 3, wherein a surface of the fixing clamp 10, 20, the connection clamp 30, the movable clamp 40, 50 is in contact with the pipes. Pipe welding device having a gap, characterized in that the protrusion formed. A cross section of the first pipe 4 and the second pipe 5 is provided between the first pipe 4 and the second pipe 5 having voids formed between the inner wall and the outer wall, and both end surfaces thereof are formed by heat fusion. And a pore area of said connection pipe (6) being smaller than that of said first pipe (4) and said second pipe (5). delete

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