KR200387088Y1 - Composite double pipe and its pressure forming device - Google Patents

Abstract

The present invention relates to a composite double pipe in which a stainless pipe is placed on an outer surface of a metal pipe, and in particular, a metal pipe is placed on an inner surface of a stainless pipe, so that a metal pipe inserted in the inner surface of a metal pipe reinforces robustness even if the expensive stainless pipe is thinned. Therefore, it is not a problem in the robustness during use, and also makes it possible to use for various purposes in each field by blocking the molten stainless pipes generated from the metal pipe during use.

As the apparatus for manufacturing the composite double pipe, a roll forming machine is used, and the composite double pipe is pressurized while the stainless steel sheet and the metal pipe wound in the roll state are sequentially passed through the pressure roller configured in the roll forming machine, and the stainless plate is wrapped on the outer surface of the metal pipe. It was molded.

Description

COMPOSITE DOUBLE PIPE AND ITS PRESSURE FORMING DEVICE}

The present invention relates to a composite double pipe and its manufacturing apparatus, and in particular, the inner surface of the metal pipe with low cost and excellent rigidity, and the outer surface of the stainless steel pipe with excellent properties and beautiful appearance to be wrapped in various applications (drying table, Baked plates, industrial products, building materials, and other household goods).

In general, the use of stainless steel pipes that are rust-free and beautiful in appearance for household goods such as grilling grills and drying racks and building materials such as apartments and verandas of houses.

However, in order to maintain sufficient strength as the stainless pipe itself, a thick stainless steel plate must be used, which increases production cost, thus avoiding its use. Therefore, the steel pipe which is relatively inexpensive compared to stainless steel is used to prevent rust during use. The paint is used for painting or coating the resin, but when it is used for a long time, the paint layer or the coating layer is peeled off and rust is generated, and the strength was not sufficient.

As an example, in the case of roasting grill, it is ideal to manufacture the grilling grill using stainless rods, which is harmless to the human body and does not rust. However, the use of the grilling grill is extremely limited. It is used and then plated.

In the case described above, the price is cheaper than the grilled grill plate made of stainless rods, but there is a risk that rust may be generated even when used only once.

In addition, if stainless steel pipes are used in laundry drying racks, vinyl house aggregates, and construction porches, they are not rusted and have excellent durability, but in order to maintain the required strength, thick plates should be used. Avoid using stainless pipes and use low cost iron pipes.

Therefore, not only rust occurs during use, but in the case of aggregates for the vinyl house, there is a problem such that the parts embedded in the ground are easily corroded and cannot be used for a long time.

The present invention is to manufacture a stainless steel pipe, that is, a composite double pipe at a relatively low price while maintaining sufficient rigidity and durability to correct all the conventional problems, and to use a variety of materials using the composite double pipe.

In order to achieve the above object, the present invention is made to have a stainless steel pipe having excellent price and excellent properties and beautiful appearance on its outer surface, and a metal pipe having excellent rigidity and low cost on its inner surface.

At this time, the stainless pipe located on the outer surface of the metal pipe is made of a relatively thin plate to reduce the manufacturing cost and at the same time the thickness is thin, which makes the problem of the rigidity and rigidity complemented by the metal pipe located on the inner surface.

Therefore, the stainless steel pipe is located on the outside surface to provide a beautiful appearance without rust during use, and the inside of the metal pipe is located on the inside, so that the thickness is thinner, which makes it possible to provide a more ideal composite double pipe by compensating for the rigidity caused by thinning. It was made.

At this time, it is preferable to prevent the rust generated during use by welding the stainless steel plate on both ends of the composite double pipe to prevent the metal pipe located on the inner surface is exposed to the outside.

In carrying out the present invention, the material constituted on the outer surface is not necessarily a stainless steel plate, and various materials may be used as necessary, and the diameter of the composite double pipe may also be used in various sizes.

Hereinafter, a composite double pipe to be provided in the present invention and a manufacturing apparatus thereof will be described in detail.

1 is a partial cross-sectional view of a composite double pipe (1) to be provided in the present invention, the stainless pipe (3) is located on the outer surface of the metal pipe (2).

At this time, the coupling pipe portion 4 is formed at both ends of the stainless pipe 3, and then a stainless stopper 5 matching the inner diameter of the stainless pipe 3 is inserted into the coupling space 4, and then welded to the stainless pipe 3. Ideally, the metal pipe 2 fitted to the inner surface is completely blocked from the outside.

As a means of manufacturing the composite double pipe (1) to be provided in the present invention can be produced by manually inserting the metal pipe (2) manually in the stainless pipe (3), in this case the length of the pipe is relatively short and suitable for small quantities If the length of the pipe is long and mass production is required, it is preferable to use a forming machine.

Fabrication of the composite double pipe 1 using the forming machine is as follows.

That is, Figure 3 is a schematic configuration diagram of the forming machine (M) for the production of the composite double pipe (1) to be provided in the design, Figures 4 to 15 is a configuration diagram of the step-by-step pressure roller configured in the forming machine (M). Their configuration is as follows.

That is, the stainless plate 7 wound in a roll state on the guide roller 6 is placed thereon, and is drawn out to the pressure roller at a constant speed by the withdrawal roller 8 formed on the front surface, and between the stainless plate 7 and the pressure roller. The metal pipe 2 wound in the roll state is positioned and then drawn out to the pressure roller at the same speed as the stainless plate 7.

The pressing roller constitutes a first pressing roller 10 composed of the first upper roller 11 and the first lower roller 12, and behind the second upper roller 21 and the second lower roller 22. The third press roller 30, the fourth upper roller 41, and the fourth lower roller 42 constituted of the second pressing roller 20, the third upper roller 31, and the third lower roller 32. The fourth pressing roller 40, the fifth upper roller 51 and the fifth lower roller 52 constituted by the fifth pressing roller 50, the sixth upper roller 61 and the sixth lower roller 62 The sixth pressing roller 60, the seventh upper roller 71, and the seventh lower roller 72, the seventh pressing roller 70, the eighth upper roller 81 and the eighth lower roller 82 are configured. The eighth press roller 80, the ninth upper roller 91 and the ninth press roller 90, the tenth upper roller 101 and the tenth lower roller 102 The eleventh pressing roller 110 configured as the tenth press roller 100, the eleventh upper roller 111, and the eleventh lower roller 112, the twelfth upper roller 121, and the twelfth lower roller 122.Consisting of the twelfth pressure roller 120 and the cutter 130, the stainless steel plate 7 and the metal pipe (2) passes through the twelfth pressure roller 120 from the first pressure roller 10 in stages Since the stainless steel plate 7 is wrapped around the outer surface of the metal pipe 2, the manufacture of the composite double pipe 1 of the present invention is completed.

The process of forming the composite double pipe 1 through the configuration of the pressure roller and the pressure roller will be described step by step.

The first press roller 10 is configured as shown in FIG.

That is, the first pressing roller 10 is composed of the first upper roller 11 and the first lower roller 12, but the circular upper recess 11 in the center of the first upper roller 11 to form a relatively relative to the left and right sides The first lower roller 12 positioned at the lower end of the first upper roller 11 and having the first flat pressing part 14 formed thereon is provided with a first flat bearing part 15 which maintains a flat state. .

Therefore, the metal pipe 2 supplied to the first pressing roller 10 is positioned in the circular recessed groove 13 of the first upper roller 11, and the stainless plate 7 is the first upper and lower rollers 11 and 12. The pressure in the predetermined pressure by the first flat pressing unit 14 and the first flat support portion 15 while being positioned between.

The second press roller 20 is configured as in FIG.

In other words, the second pressing roller 20 is composed of a second upper roller 21 and a second lower roller 22, but a circular recess groove 23 in the center of the second upper roller 21, and the circular yaw A second curved pressing portion 24 and a flat portion 25 are formed at both sides of the mouth groove 23, and a second curved surface is formed at the center of the second lower roller 22 positioned at the lower end of the second upper roller 21. The supporting portion 26 is protruding, and the curved ratio of the second curved pressing portion 24 and the second curved supporting portion 26 is exactly the same, and both sides of the second curved supporting portion 26 are The flat part 27 is comprised.

Therefore, the metal pipe 2 supplied to the second pressing roller 20 is located in the circular recessed groove 23 of the second upper roller 21, and at the same time, the stainless plate 7 has the second curved pressing portion 24. And bent in the upward direction while being pressed by the second curved support 26.

The third press roller 30 is configured as in FIG.

That is, the third pressing roller 30 is composed of the third upper roller 31 and the third lower roller 32, the circular recess groove 33 is formed in the center of the third upper roller 31, the circular yaw A third curved pressing portion 34 and a flat portion 35 are formed at both sides of the mouth groove 33, and a third curved support is formed at the center of the third lower roller 32 positioned at the lower end of the third upper roller 31. The portion 36 is protruding, wherein the curved ratio of the third curved support portion 36 and the third curved pressing portion 34 is exactly the same, and the curved ratio is the curved surface of the second pressing roller 20. It is comprised slightly larger than the ratio, and the planar part 37 is comprised in the both sides of the 3rd curved support base 36. As shown in FIG.

Therefore, the metal pipe 2 supplied to the third pressing roller 30 is positioned in the circular recessed groove 33 of the third upper roller 31, and at the same time, the stainless plate 7 is the third curved pressing portion 34. ) And slightly curved than the second pressing roller 20 while being pressed by the third curved support base 36.

The configuration of the fourth pressure roller 40 is as shown in FIG.

That is, the fourth press roller 40 is composed of the fourth upper roller 41 and the fourth lower roller 42, the center of the fourth upper roller 41 is formed with a circular recess groove 43, the circular Both side portions of the recessed groove 43 constitute a fourth curved pressure portion 44 having a larger curved ratio than the third curved pressure portion 34, and a flat portion 45 on both sides of the fourth curved pressure portion 44. Consists of.

In the center of the fourth lower roller 42 located at the lower end of the fourth upper roller 41, a fourth curved support portion 46 having a curved ratio equal to the fourth curved pressing portion 44 is formed. 47 is configured.

Therefore, the metal pipe 2 supplied to the fourth pressing roller 40 is positioned in the circular recessed groove 43, and at the same time, the stainless plate 7 is provided with the fourth curved pressing portion 44 and the fourth curved supporting portion ( It is pressurized by 46 and is slightly curved than the third press roller 30.

The structure of the 5th press roller 50 is comprised as shown in FIG.

That is, the fifth press roller 50 is composed of a fifth upper roller 51 and a fifth lower roller 52, but a circular recess groove 53 is formed at the center of the fifth upper roller 51, A fifth curved pressing portion 54 and a flat portion 55 are formed at the side of the mouth groove 53, and the curved ratio of the fifth curved pressing portion 54 is slightly larger than that of the fourth curved pressing portion 44. It is.

In the center of the fifth lower roller 52 positioned at the lower end of the fifth upper roller 51, a fifth curved support 56 is formed, and the flat portion 57 is formed at the side.

Therefore, the metal pipe 2 supplied to the fifth pressing roller 50 is located between the circular recessed grooves 53, and at the same time, the stainless steel plate 7 has the fifth curved pressing portion 54 and the fifth curved supporting portion. While being pressurized by the 56, the fourth press roller 40 is slightly more curved.

The structure of the 6th pressure roller 60 is comprised as shown in FIG.

That is, the sixth pressing roller 60 is composed of the sixth upper roller 61 and the sixth lower roller 62, but the circular concave groove 63 protrudes in the center of the sixth upper roller 61, and the circular A vertical portion 68 is formed between the circular recessed groove 63 and the sixth curved pressing portion 64 by forming a sixth curved pressing portion 64 at both sides of the recessed groove 63. The flat part 65 is comprised in the both sides of the part 64. As shown in FIG.

The sixth lower surface bearing part 66 protrudes from the center of the sixth lower roller 62 located at the lower end of the sixth upper roller 61, and the flat portion 67 is formed at the side.

Therefore, the metal pipe 2 supplied to the sixth press roller 60 is located in the circular guide groove 63 formed in the sixth upper roller 61, and at the same time, the stainless plate 7 is the sixth upper and lower roller 61. It is bent in a substantially circular state by the sixth curved pressing portion 64 and the sixth curved support portion 66 formed in the (62) to surround the outer surface of the metal pipe (2) located in the circular recess groove (63). .

The seventh press roller 70 is constructed as shown in FIG.

That is, the seventh pressing roller 70 is composed of the seventh upper roller 71 and the seventh lower roller 72, the center of the seventh upper roller 71 constitutes a seventh curved pressing portion 74 formed in a circular shape In addition, the flat part 75 is comprised in the side part.

A seventh curved support portion 76 protrudes from the center of the seventh lower roller 72 in contact with the seventh upper roller 71, and a flat portion 77 is provided at both sides of the seventh curved support portion 76. In this case, the seventh curved pressing portion 74 and the seventh curved support portion 76 formed in the seventh upper and lower rollers 71 and 72 are maintained in a circular state.

Therefore, the stainless plate 7 supplied to the seventh pressure roller 70 is bent in a circular arc shape by the seventh curved pressure portion 74 and the seventh curved support portion 76 formed in the seventh pressure roller 70. The metal pipe 2 is positioned on the inner surface of the stainless pipe 3 made of the stainless steel plate 7 while both ends of the stainless steel plate 7 are in contact with each other to surround the outer surface of the metal pipe 2. The joint of the plate 7 is welded by alcohol welding in the usual manner.

The configuration of the eighth pressure roller 80, the ninth pressure roller 90, the tenth pressure roller 100, the eleventh pressure roller 110 and the twelfth pressure roller 120 is as shown in Figs. It is comprised similarly and these structures are as follows.

That is, the eighth pressing roller 80 is composed of an eighth upper roller 81 and an eighth lower roller 82, and the eighth curved pressing unit 84 and the eighth upper and lower rollers 81 and 82 are centered. Eight curved support portion 86 protrudes, the curved support portion 86 and the curved pressing portion 84 to maintain a complete circular shape, both sides are composed of the flat portion (85, 87) have.

As in the eighth pressure roller 80, the ninth pressure roller 90, the tenth pressure roller 100, the eleventh pressure roller 110 and the twelfth pressure roller 120 are also ninth, 10, 11, 12 The upper rollers (91) (101) (111) (121) and the ninth, 10, 11, and 12 lower rollers (92, 102, 112, 122), each of the upper rollers in the ninth , 10, 11, 12 curved pressing parts 94, 104, 114, and 124, so that the flat parts 95, 105, 115, 125 are formed on both sides, and each lower roller center The 9th, 10th, 11th, and 12th curved support parts 96, 106, 116, and 126 protrude, and the flat parts 97, 107, 117, and 127 are provided on both sides. have.

Therefore, the stainless steel plate 7 is completely wrapped in a pipe shape by the seventh upper roller 71 and the seventh lower roller 72 formed in the seventh press roller 70 in the form of a pipe, and then alcohol The welded composite double pipe 1 passes through the eighth through twelve pressure rollers 80, 90, 100, 110, and 120, and the eighth through twelve upper rollers 81, 91, 101, and 111. Each of the curved pressing portions 84, 94, 104, 114, and 124 formed in the < RTI ID = 0.0 > 121 < / RTI > and the eighth to twelve lower rollers 82, 92, 102, 112 and 122 The composite double pipe (1) is completed by the pressurization by the curved support parts 86, 96, 106, 116 and 126, and the manufacture of the complete composite double pipe 1 is completed. ) Is cut to a certain length by the cutter (130).

Reference numeral 9 is an axis.

The composite double pipe (1) of the present invention manufactured as described above has excellent rigidity and low price, but on the outer surface of the metal pipe (2) which has the disadvantage of being easily rusted, the price is expensive or rustless and the appearance is beautiful and various By placing the stainless steel pipe (3) having excellent properties, it is possible to be provided with a high quality composite double pipe (1), which is robust and rust-resistant at low manufacturing cost.

That is, since the stainless steel sheet 7 wrapped on the outer surface of the metal pipe 2 is expensive, the thickness of the stainless steel sheet 7 is made thinner by reducing the manufacturing cost by making the thickness of the sheet relatively thin at the time of manufacturing, so that the rigidity becomes weak due to the thinner inner surface. Since the metal pipe (2) located in the complement and support, the composite double pipe (1) provided in the present invention will be able to receive a high-quality stainless steel pipe at a low price.

In addition, in manufacturing the composite double pipe (1) of the present invention, if you want to obtain a short product can be obtained by a simple operation of inserting the metal pipe (2) of the thickness required on the inner surface of the stainless pipe (3), but the length is long If you want mass production, you can simply mass production using the forming machine (M) provided in the present invention.

That is, the stainless steel sheet 7 and the metal pipe 2 wound in a roll state pass between the first upper and lower rollers 11 and 12 configured in the first press roller 10, and then the stainless plate 7 and the metal pipe. The stainless steel plate 7 is gradually moved by the upper and lower rollers while the upper and lower rollers (2) are sequentially moved to the seventh pressing roller 70 via the second upper and lower rollers 21 and 22 configured in the second pressing roller 20. The seventh press roller 70 is completely covered with a stainless steel sheet (7) in the form of a pipe on the outer surface of the metal pipe (2) and then alcohol welded, the composite double pipe is again 8th, 9, 10 , 11, 12 pressure rollers 80, 90, 100, 110, 120 is pressed again passing through it is possible to quickly and easily produce a complete and robust composite double pipe (1).

The composite double pipe (1) to be provided in the present invention is a metal pipe (2) is located on the inner surface and rust on the outer surface, the appearance is beautiful and excellent stainless steel pipe (3) is excellent in various properties, the composite double pipe (1) By using), it can be used for various purposes for building and industrial purposes such as laundry drying rack, vinyl house aggregate, handrail for house or apartment veranda, and the thin one can be used for grilling grill or household goods.

In using the composite double pipe (1), the coupling space portion (4) is formed at both ends of the stainless pipe (3), and the stopper (5) made of stainless steel is inserted into the coupling space portion (4) and then welded. If used, since the metal pipe 2 is not exposed to the outside, there is no risk of rust, and welding is easily performed during welding for connection.

In carrying out the present invention, the material that is press-molded on the outer surface of the metal pipe is not only a stainless steel plate can be used, but may be manufactured using various materials as necessary.

In addition, the diameter of the composite double pipe can be adjusted by replacing the pressure roller.

As described above, the composite double pipe provided by the present invention has excellent rigidity and low price on the outer surface of the metal pipe, and the price is high, but the stainless steel pipe having excellent properties and beautiful appearance is located, so it is excellent in robustness and does not rust in use. In addition, it is possible to obtain a composite double pipe with a beautiful appearance, and the composite double pipe can be used in various materials such as building, industrial, household goods, and the like.

1 is a cross-sectional view of a composite double pipe to be provided in the present invention

2 is a cross-sectional view of FIG.

3 is a schematic configuration diagram of the present invention manufacturing apparatus

4 is a configuration diagram of the first pressure roller configured in the present invention device

5: Configuration diagram of the second pressure roller configured in the present invention device

6: Configuration diagram of the third pressure roller configured in the present invention device

7: Configuration diagram of the fourth pressure roller configured in the present invention device

8: Configuration diagram of the fifth pressure roller configured in the present invention device

9 is a configuration diagram of the sixth pressure roller configured in the present invention device

10: Configuration diagram of the seventh pressure roller configured in the present invention device

11 is a configuration diagram of the eighth pressure roller configured in the present invention device

12: Configuration diagram of the ninth pressure roller configured in the present invention device

13: Configuration diagram of the tenth pressure roller configured in the present invention device

14: Configuration diagram of the eleventh pressure roller configured in the present invention device

15 is a block diagram of a twelfth pressure roller configured in the present invention device

16 is a perspective view of a composite double pipe produced by the present invention device

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

(1)-Complex Double Pipe (2)-Metal Pipe

(3)-stainless steel pipe (4)-joint space

(5)-Spigot (6)-Guide Roller

(7)-Stainless Steel Plate (8)-Draw Roller

(10)-First Pressing Roller (11)-First Upper Roller

(12)-first lower roller (13)-round groove

(20)-Second Pressure Roller (21)-Second Upper Roller

(22)-Second Lower Roller (23)-Round Groove

(24)-Second Surface Pressing Part (26)-Second Surface Support

(30)-Third Pressure Roller (31)-Third Upper Roller

(32)-Third Lower Roller (33)-Round Groove

(34)-Third Surface Pressing Part (36)-Third Surface Support

(40)-4th press roller (41)-4th top roller

(42)-fourth lower roller (43)-round groove

(44)-Fourth Curve Presser (46)-Fourth Surface Support

(50)-Fifth Pressing Roller (52)-Fifth Lower Roller

(54)-Fourth Curve Presser (56)-Fifth Surface Support

(60)-Sixth Press Roller (61)-Sixth Upper Roller

(62)-sixth lower roller (63)-round groove

(64)-Sixth Surface Pressing Unit (66)-Sixth Surface Support

(70)-Seventh Pressure Roller (71)-Seventh Upper Roller

(72)-Seventh Lower Roller (74)-Seventh Curved Pressing Unit

(76)-Seventh Curve Support (80)-Eighth Pressure Roller

(81)-Eighth Upper Roller (82)-Eighth Lower Roller

(84)-Eighth Curved Press (86)-Eighth Curved Support

(90)-Ninth Pressure Roller (91)-Ninth Top Roller

(92) --The ninth lower roller (94)-The eighth curved pressing part

(96) --The 9th Surface Support (100)-The 10th Pressure Roller

(101)-Top Ten Rollers (102)-Top Ten Rollers

(104)-tenth curved pressing part (106)-tenth curved support

(110)-Eleventh Pressure Roller (111)-Eleventh Upper Roller

(112)-Eleventh Lower Roller (114)-Eleventh Curved Pressure Part

(116)-Eleventh Surface Support (120)-Twelve Pressure Roller

(121)-Twelfth Upper Roller (122)-Twelfth Lower Roller

(124)-Twelfth Curve Presser (126)-Twelfth Surface Support

(130)-cutter

Claims (3)

A stainless pipe 3 is formed on the outer surface of the metal pipe 2, but coupling spaces 4 are formed at both ends of the stainless pipe 3, and a stainless stopper 5 is formed on the coupling space 4. Composite double pipe, characterized in that to be sealed by welding. Take out the stainless steel sheet 7 and the metal pipe (2) wound in a roll state to be supplied to the first pressure roller (10) consisting of the first upper and lower rollers (11, 12), the first upper roller (11) In order to form a circular recess 13 in the center, the metal pipe 2 is positioned in the circular recess 13 and at the same time, a stainless plate 7 is formed between the first upper and lower rollers 11 and 12. The metal pipe (2) and the stainless steel plate (7) passing through the first pressure roller 10, the second pressure roller (20), the third pressure roller (30), the fourth pressure roller (40), While the stainless plate 7 is gradually bent by the curved pressing portion and the surface supporting portion configured in each pressing roller via the fifth pressing roller 50, the sixth pressing roller 60, and the seventh pressing roller 70. The composite double pipe 1 is press-molded by completely enclosing the stainless steel plate 7 on the outer surface of the metal pipe 2, and the composite double pipe 1 is made of an eighth. The press roller 80 and the 9, 10, 11, 12 pressure roller (90, 100, 110, 120) are again press-molded so that the stainless steel plate (7) is wrapped on the outer surface of the metal pipe (2). Pressurized molding apparatus for a composite double pipe using a roll forming machine, characterized in that the composite double pipe (1) configured to be pressed. Take out the stainless steel sheet 7 and the metal pipe (2) wound in a roll state to be supplied to the first pressure roller (10) consisting of the first upper and lower rollers (11, 12), the first upper roller (11) In order to form a circular recess 13 in the center, the metal pipe 2 is positioned in the circular recess 13 and at the same time, a stainless plate 7 is formed between the first upper and lower rollers 11 and 12. The metal pipe (2) and the stainless steel plate (7) passing through the first pressure roller 10, the second pressure roller (20), the third pressure roller (30), the fourth pressure roller (40), While the stainless plate 7 is gradually bent by the curved pressing portion and the surface supporting portion configured in each pressing roller via the fifth pressing roller 50, the sixth pressing roller 60, and the seventh pressing roller 70. The composite double pipe 1 is press-molded by completely enclosing the stainless steel plate 7 on the outer surface of the metal pipe 2, and the composite double pipe 1 is made of an eighth. The press roller 80 and the ninth, 10, 11, 12 pressing rollers 90, 100, 110, 120 are pressed again to form a stainless steel sheet 7 on the outer surface of the metal pipe 2. A composite double pipe using a roll forming machine, characterized in that the composite double pipe (1) configured to be pressed.