KR20100013731A - Manufacturing method and apparatus for double layer elbow by pressing - Google Patents

Abstract

The present invention relates to a double pipe elbow crimping manufacturing method and apparatus, and more particularly, a plurality of split molds by inserting an inner elbow tube having abrasion resistance into a hollow outer elbow tube, and then bisecting the outer elbow tube bent at a predetermined angle. The present invention relates to a method and a device for quickly and efficiently manufacturing a double tube elbow by pressing each.

The double-pipe elbow compression manufacturing apparatus according to the present invention is divided into a cylinder having a main body provided with a receiving portion, a cylinder rod provided at one end of the receiving portion of the main body and installed so as to be able to move forward and backward toward the other end of the receiving portion. A compression guide provided between the rod and the other end of the main body accommodating portion and provided with a plurality of pressure pieces which are installed to retract inward when the cylinder rod moves forward and open outward when retracted; The plurality of springs provided between the side surfaces and the circumferential direction are separated, and the outer circumferential surface is fixed to the plurality of pressing pieces of the crimping guide. A split mold divided into a plurality of pieces so as to have an outer circumferential surface shape that is divided into elbows It is characterized by.

Description

MANUFACTURING METHOD AND APPARATUS FOR DOUBLE LAYER ELBOW BY PRESSING}

The present invention relates to a double pipe elbow crimping manufacturing method and apparatus, and more particularly, a plurality of split molds by inserting an inner elbow tube having abrasion resistance into a hollow outer elbow tube, and then bisecting the outer elbow tube bent at a predetermined angle. The present invention relates to a method and a device for quickly and efficiently manufacturing a double tube elbow by pressing each.

In the concrete pump car, a double pipe having abrasion resistance is used to transfer the concrete to be conveyed. The double pipe is divided into a straight pipe conveying in a straight line and an elbow bent at an angle to connect the vertical pipes in order to change the direction of the conveyed concrete according to the use purpose.

The present invention relates to a double tube elbow bent at an angle. Conventional double tube elbows are hollow outer elbows made of steel having toughness bent at a predetermined angle, and bent at a predetermined angle having abrasion resistance that is inserted into the inner circumferential surface of the outer elbows and is heat-treated so that they are not easily worn by the pressed concrete. A hollow inner elbow. In addition, flanges are welded to both ends of the outer elbow tube in which the inner elbow tube is inserted so as to connect and install another transfer pipe.

Conventional methods for producing double tube elbows having the above configuration are known as follows. The first manufacturing method is to produce a double pipe elbow by manufacturing the outer elbow tube in a symmetrical form divided up and down by a press, and then assembled to surround the outer side of the inner elbow tube, and then welding the coupling surface. In the second manufacturing method, instead of joining the outer elbow pipe divided up and down by welding, a flange is formed on the joining surface of the divided outer elbow pipe, a hole is formed in the flange, and a double pipe elbow is manufactured by fastening with a bolt and a nut. It is. As described above, in order to weld the outer elbows divided up and down or fasten with bolts and nuts, the inner elbows are wrapped with the divided outer elbows and then welded or bolted in a pressurized state.

Conventionally, a method of manufacturing a pair of outer elbows divided into upper and lower parts by welding or fastening bolts and nuts requires a pressurization device for a separate coupling. In particular, the method of manufacturing the double pipe elbow by welding has a problem in that the wear resistance is lowered because the inner tube in contact with the spark caused by welding is heated to deform the tissue. In addition, since the welding work is cumbersome, the productivity is low, and there is a fear that welding failure occurs when a skilled worker does not perform the welding work.

In addition, the method of manufacturing the double pipe elbow by fastening with the bolt and nut, it is necessary to carefully work so that the divided outer elbow tube is in close contact with the inner elbow tube by tightening the bolt and nut as a whole. As such, when the bolt is unused for a long time in the bolted state, there is a problem in that the close contact between the outer elbow and the inner elbow is released, so that the shock is easily broken. In addition, it is difficult to fasten the outer elbow to the inner elbow pipe with a uniform pressure by a plurality of bolts and nuts, there is another problem that takes a lot of assembly time.

The conventional double pipe elbow manufacturing method having the above problem is to reduce the reliability of the manufactured product, and the manufacturing process has to go through several steps, which is complicated and the productivity is low, thereby increasing the price of the product. In addition, the double tube elbow manufactured by the conventional method is exposed to the outside of the outer elbow tube of the weld line or the fastening bolts and nuts are bad aesthetics, the product volume is increased.

The present invention is to solve the above problems, and provides a method for producing a new double tube elbow. The present invention provides a method for producing a double tube elbow without dividing the outer elbow tube. In addition, the present invention provides a method of manufacturing a double pipe elbow that can prevent the damage of the product by welding or bolting failure because it does not divide the outer elbow tube to improve the reliability of the product. According to the present invention, an inner elbow tube having heat-resistant abrasion resistance is inserted into a hollow outer elbow tube integrally formed of weldable steel, and then divided and crimped at equal intervals using a crimping device to produce a double tube elbow. Therefore, the conventional work is not necessary to weld the outer elbow pipe or fasten with bolts and nuts, thereby reducing the manufacturing process according to the manufacturing process, and provides a double pipe elbow compression manufacturing method and apparatus that has improved productivity. In addition, a double pipe elbow crimping manufacturing method and apparatus which can prevent the inner elbow having abrasion resistance contacted by the flame according to the conventional welding due to high heat, and can quickly and uniformly contact the inner elbow and the outer elbow tube to provide.

The double-pipe elbow compression manufacturing apparatus according to the present invention is divided into a cylinder having a main body provided with a receiving portion, a cylinder rod installed at one end of the receiving portion of the main body, and having a cylinder rod installed to be able to move forward and backward toward the other end of the receiving portion, and circumferentially. And a compression guide having a plurality of pressure pieces which are installed between the cylinder rod and the other end of the main body accommodating portion, the cylinder rod is retracted inward when the cylinder rod moves forward, and spreads outward when the cylinder rod moves backward, and a plurality of pressurizations of the compression guide. A plurality of springs provided between the opposite side surfaces of the pieces, the plurality of springs provided so as to open the plurality of pressing pieces outwardly by a restoring force when the cylinder rod is retracted, and the outer peripheral surface is divided in the circumferential direction and the plurality of pressing parts of the crimping guide Each fixed to one side, and the cylinder rod moves forward and retracts inward Wu the inner peripheral surface of the combined shape and includes a split mold divided into a plurality of pieces so that a predetermined outer peripheral surface shape bisecting the El kept bent at an angle.

In addition, the double-pipe elbow compression manufacturing apparatus of the present invention, the outer peripheral surface of each of the divided mold forms a circumferential surface having a constant radius in the longitudinal direction when retracted, the inner peripheral surface of each of the divided mold is a shape of the cross section in the longitudinal direction when retracted It is characterized in that the curved shape so as to form an outer circumferential surface that is divided into two elbows.

In addition, the double-pipe elbow compression manufacturing apparatus of the present invention, the screw grooves formed on the outer peripheral surface of the plurality of pieces of the divided mold and the screw portion is formed at one end so as to be detachably installed in the screw groove, the diameter of the central portion at the other end A first bolt having a narrowing head portion, and a groove is formed to receive the head portion of the first bolt at a predetermined position on each inner circumferential surface of each of the plurality of pressing pieces of the crimping guide, and the first housing accommodated in the groove on one side thereof. And a second bolt installed to press the side of the head of the bolt to fix the bolt.

In addition, in the double-pipe elbow crimping manufacturing apparatus of the present invention, the crimping guide is a plurality of press pieces divided into eight in the circumferential direction, and the split mold is divided into eight pieces in the circumferential direction to be installed in the plurality of press pieces, respectively. It consists of.

Moreover, the double pipe elbow crimping manufacturing apparatus of this invention further includes the guide provided in one end of the said plurality of press pieces in order to support the outer peripheral surface of the said double pipe elbow.

In addition, the double pipe elbow crimp production apparatus of the present invention, the guide further includes a stopper provided to support the end of the double pipe elbow.

In addition, the manufacturing method of the double-pipe elbow of the present invention, the step of inserting the inner elbow tube made of heat-resistant wear-resistant steel in the hollow of the outer elbow pipe made of weldable steel, and a plurality of divided molds divided in the circumferential direction at a predetermined angle A first compression step of pressing the bisected one end of the bent outer elbow so that the inner circumferential surface of one end of the elbow is in close contact with the outer circumferential surface of the inner elbow, and the other end of the bisected outer elbow bent at a predetermined angle in the circumferential direction And a second pressing step of pressurizing the plurality of divided molds divided into the inner circumferential surface of the outer elbow tube of the other end to be in close contact with the outer circumferential surface of the inner elbow tube.

In addition, the method of manufacturing a double pipe elbow of the present invention further includes welding flanges to both ends of the outer elbow pipe.

In addition, in the method of manufacturing a double pipe elbow of the present invention, one end of the inner circumferential surface of each flange includes a small diameter portion having a diameter substantially the same as the outer circumferential surface of the inner elbow tube, and the other end inner circumferential surface has a large diameter portion larger than the diameter of the small diameter portion.

In addition, the double pipe elbow manufacturing method of the present invention is made of a wear-resistant steel, which is inserted into each of the inner peripheral surface of the flange and heat-treated, one end of the outer small diameter portion having a diameter substantially the same as the small diameter portion of the flange, and the other end of the flange It includes a reinforcement pipe formed of the outer diameter portion having a diameter substantially the same as the large diameter portion.

In addition, the method of manufacturing a double pipe elbow of the present invention is characterized in that one end inner circumferential diameter of the reinforcement pipe is substantially the same as the inner circumferential surface diameter of the inner elbow tube.

In addition, the method of manufacturing a double pipe elbow of the present invention is characterized in that the end face of the other end of the reinforcement pipe and the other end face of each of the non-welded ends of the flange are located in substantially the same plane.

In addition, the method of manufacturing a double pipe elbow of the present invention is characterized in that the end faces of both ends of the inner elbow and the end faces of the other ends of the pair of non-welded flanges are positioned in substantially the same plane.

In addition, the double pipe elbow of the present invention, the outer elbow pipe made of weldable steel, the inner elbow pipe made of a wear-resistant steel inserted into the hollow of the outer elbow pipe, and a pair of flanges welded to both ends of the outer elbow pipe The outer elbow pipe bent at a predetermined angle is divided into two, and each of the outer elbow pipes is pressed into a plurality of divided molds, and the inner circumferential surface is in close contact with the outer circumferential surface of the inner elbow pipe.

According to the present invention, a double tube elbow can be manufactured by inserting an outer elbow tube having heat resistance to wear into an integrally formed outer elbow tube made of weldable steel, and compressing the outer elbow tube. Since the integral outer elbow tube is divided into two parts by a compression device and pressed into the inner elbow tube, the inner elbow tube and the outer elbow tube can be brought into close contact with each other quickly and uniformly. The failure rate is thus reduced and a double tube elbow having a clean and beautiful appearance is provided. In addition, there is an effect that the production process of the double pipe elbow is simple and easy to improve the productivity.

In addition, according to the present invention, since the outer elbow tube is pressed to closely contact the inner elbow tube, the inner elbow tube is not damaged by heat, thereby increasing durability and decreasing the defective rate. In addition, since the close contact between the inner elbow and the outer elbow is not loosened, durability is prevented from being damaged by an external impact. The increased durability allows the user to reduce the cost of replacing the double tube elbow.

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

1 is a perspective view of an embodiment of the compression manufacturing apparatus of a double tube elbow according to the present invention, Figure 2 is a cross-sectional view taken along the line AA of Figure 1, Figure 3 is a cross-sectional view taken along the line BB of Figure 1, Figure 4 It is sectional drawing of the operation state of the crimp manufacturing apparatus of the double pipe elbow of an example.

The double pipe elbow crimping apparatus 300 manufactured by the crimping according to the present invention includes a main body 310, a cylinder 320, a crimping guide 330, and a split mold 340.

The main body 310 includes a receiving portion penetrated in the width direction. Therefore, it is preferable that the main body 310 is detachably assembled to the upper / lower side or the left / right side to provide the accommodation unit, but is not limited thereto.

One end of the cylinder 320 is installed on the lower surface of the receiving portion of the main body 310, and the other end is provided with a cylinder rod 321 so as to be able to move forward and backward toward the upper surface of the receiving portion.

The crimping guide 330 is composed of a plurality of guide pieces divided in the circumferential direction. Therefore, when the cylinder rod 321 is advanced in the direction of the upper surface of the receiving portion, the first to eighth pressing pieces 331 to 338 retract inward. On the contrary, when the advanced cylinder rod 321 moves backward in the direction of the lower surface of the receiving portion, the first to eighth pressing pieces 331 to 338 open outward.

More specifically, the first pressing piece 331 is installed on the upper surface of the main body 310 receiving portion. Then, the fifth pressing piece 335 which is installed to face the first pressing piece 331, is fixed to an end of the cylinder rod 321, and slides in the forward / backward direction of the cylinder rod 321. It is installed. In addition, third and seventh pressing pieces 333 and 337 are provided at positions corresponding to sliding along both inclined surfaces of the first and fifth pressing pieces 331 and 335, respectively. The second pressing piece 332 is provided between the first and third pressing pieces 331 and 333, and the fourth pressing piece 334 is provided between the third and fifth pressing pieces 333 and 335. Further, a sixth press piece 336 is provided between the fifth and seventh press pieces 335 and 337, and an eighth press piece 338 is provided between the seventh and first press pieces 337 and 331. Therefore, when the cylinder rod 321 is advanced in the upper direction of the receiving portion, the fifth pressing piece 335 provided with the cylinder rod 321 is advanced, and at this time, the third and seventh installed on both sides of the fifth pressing piece 335. The pressing pieces 333 and 337 slide inwardly along the inclined surfaces on both sides of the first and fifth pressing pieces 331 and 335. At the same time, the second and fourth pressing pieces 332 and 334 and the sixth and eighth pressing pieces 336 and 338 retract along the inclined surfaces. On the contrary, when the cylinder rod 321 is reversed, the fifth pressing pieces 335 are restored, and the plurality of pressing pieces are opened toward the outside, respectively.

As described above, the crimping guide 330 having the first to eighth pressing pieces 331 to 338 divided in the circumferential direction is in contact with each other when it is retracted or opened to form an inclined surface to smoothly slide. It is preferable, but it is not limited to this. In addition, the first to eighth pressing pieces 331 to 338 are formed with one or more grooves on each side facing each other of the first to eighth pressing pieces 331 to 338 so as to be efficiently restored by the elastic force. A plurality of springs S are inserted between the grooves formed and inserted at both ends. Thus, a stable and uniform operation as a whole is possible when it is retracted inwardly or outwardly. In addition, it is preferable that the first to eighth pressing pieces 331 to 338 are engaged with each other in a concave-convex groove shape so that the first to eighth pressing pieces 331 to 338 can slide without being separated when they are retracted in the inner direction or are opened in the outer direction. In addition, the fifth pressing piece 335 that is moved forward / backward by the cylinder rod 321 has a concave-convex groove shape on both inner side surfaces of the receiving portion and the fifth pressing piece 335 that are guided so as to stably move forward and backward. It is preferable to slide in engagement with each other.

In the present invention, the plurality of pressing pieces of the crimping guide 330 is divided into eight pieces in the circumferential direction to be slid or opened so as to be slidable, but the present invention is not limited thereto. You can divide small or many. At this time, it is preferable that a plurality of pieces of the division mold 340 are divided to be equal to the number of the plurality of pressing pieces.

The split mold 340 is divided in the circumferential direction so as to correspond to the first to eighth pressing pieces 331 to 338 of the crimping guide 330, and the inner circumferential surface is bent at a predetermined angle. The elbow tube 210 is divided into first to eighth pieces 341 to 348 so as to have a bisected outer circumferential surface shape. In other words, the first to eighth pieces 341 to 348 have an outer circumferential surface shape in which the inner elbow pipe 210 bent at 90 ° is bisected at 45 °. Therefore, by dividing the outer circumferential surface of the outer elbow tube 220 into which the inner elbow tube 210 is inserted at 45 ° and uniformly and effectively compressing them, the outer elbow tube 220 causes plastic deformation so that each inner circumferential surface corresponds thereto. In close contact with the outer circumferential surface of the inner elbow tube 210 can quickly produce a double pipe elbow (200).

In order to manufacture the double tube elbow 200 as described above, the outer circumferential surface of the first to eighth pieces 341 to 348 of the divided mold 340 forms a circumferential surface having a constant radius in the longitudinal direction when retracted, The first to eighth pieces 341 to 348 of the split mold 340 are curved in shape so that the cross-sectional shape in the longitudinal direction in the case of the split mold 340 forms the outer circumferential surface of the double tube elbow 200. Accordingly, the outer circumferential surfaces of the first to eighth pieces 341 to 348 are formed in a cylindrical shape having a constant radius to improve assembling with the crimping guide 330, and the first to eighth pieces 341 to 348. The inner circumferential surface of is characterized in that it is formed along the curved surface of the double pipe elbow 200 to be completely in contact with the compression.

The first to eighth pieces 341 to 348, which are the division molds 340, are installed to be separated from the first to eighth pressing pieces 331 to 338 of the crimping guide 330, and are installed to facilitate replacement. . That is, screw grooves are formed at predetermined positions on the outer circumferential surface of the first to eighth pieces 341 to 348 of the divided mold 340. The first bolt b1 includes a head portion having a narrow diameter in the center portion and a threaded thread portion, and the screw portion is detachably assembled to the thread grooves of the corresponding first to eighth pieces 341 to 348. do. As such, the first to eighth pieces 341 to 348 having the first bolt b1 disposed on the outer circumferential surface thereof are installed on the first to eighth pressing pieces 331 to 338 of the corresponding crimping guide 330. At this time, the head portion of the first bolt (b1) is inserted into the groove formed in the predetermined position on the inner circumferential surface of the first to eighth pressing pieces (331 to 338), and then one of the first to eighth pressing pieces (331 to 338). The second bolt (b2) is installed to press the side of the head portion of the first bolt (b1) accommodated in the groove from the side. Therefore, when the second bolt b2 is rotated forward clockwise with respect to the X-axis, the split mold 340 is pressed while the end of the second bolt b2 is pressed against the side of the head of the first bolt b1. It is fixed not to be separated from the crimping guide 330. On the contrary, when the split mold 340 is damaged or the whole is replaced to manufacture another double pipe elbow, when the second bolt b2 is rotated counterclockwise with respect to the X axis, the end of the second bolt b2 is The release mold 340 is separated from the crimping guide 330 while the head side of the first bolt b1 has been released and can be easily replaced.

As described above, when the cylinder rod 321 moves forward, the pressing device 300 includes a plurality of pressing pieces 331-of the pressing guide 330 provided with a plurality of pieces 341 to 348 of the split mold 340 corresponding to each other. 338) is pressed inward to retract. At this time, the inner circumferential surfaces of the plurality of pieces 341 to 348 of the divided mold 340 are retracted inward, and the combined shape forms the outer circumferential surface of the inner elbow 210 and is inserted into the outer circumferential surface of the inner elbow 210. While the outer elbow tube 220 is plastically deformed, the inner elbow tube 210 and the outer elbow tube 220 are brought into close contact with each other.

Hereinafter, a method for manufacturing a double tube elbow according to the present invention using the double tube elbow crimping apparatus 300 will be described.

5 (a) to 5 (f) is a manufacturing method of the double pipe elbow using the compression manufacturing apparatus of the double pipe elbow according to the present invention, Figure 6 is a double pipe elbow of the first embodiment manufactured by the manufacturing method of Figure 5 Perspective view.

Method for manufacturing a double pipe elbow according to the present invention, first, the inner elbow pipe 220 made of weldable steel, the inner elbow pipe made of heat-resistant wear-resistant steel and having an outer diameter smaller than the inner diameter of the outer elbow pipe 220 ( 210 and a pair of cylindrical flanges 230 and reinforcement pipes 250 formed of weldable steel are formed, each having an annular fastening groove having a trapezoidal cross section on an outer circumferential surface thereof.

Next, as shown in FIG. 5 (b), the inner elbow 210 bent at 90 ° is slowly pushed into the hollow outer elbow 220 at the 90 ° bent, which is called an insertion step. As such, when the inner elbow 210 is pushed into the outer elbow 220, there is a minimum distance d for smooth insertion.

Next, as shown in FIG. 5 (d), the outer elbow tube 220 into which the inner elbow tube 210 is inserted is a double pipe elbow 200 into the split mold 340 of the crimping apparatus 300 according to the present invention. Insert to squeeze the bisected ends of. At this time, one end of the double pipe elbow 200 is located in the split mold 340, the other end is exposed to the outside of the crimping device (300). Therefore, the guide 350 is installed to support the outer circumferential surface of the exposed double pipe elbow 200 to prevent the other end of the exposed double pipe elbow 200 from being shaken or twisted to facilitate the compression. The stopper 351 is further installed at the end of the guide 350 so that the exposed end of the double pipe elbow 200 is not pushed.

When the arrangement is completed as described above, the cylinder rod 321 of the pressing device 300 is advanced in the upper direction to press the fifth pressing piece 335 of the pressing guide 330 in the upper direction. At this time, the third and seventh pressing pieces 333 and 337 are retracted inwards along the inclined surfaces of the first and fifth pressing pieces 331 and 335, and at the same time, the second and fourth pressing pieces 332 and 334 and the sixth and eighth pressures. Pieces 336 and 338 also retract inwards along the inclined surfaces that are in contact with each other. As the crimping guide 330 is retracted inward, the first to eighth pieces 341 to 348 of the split mold 340 installed to correspond to the first to eighth pressing pieces 331 to 338 are simultaneously retracted and mounted. The outer peripheral surface of the bisected one end of the outer elbow tube 220 is uniformly compressed. At this time, the inner circumferential surface of the first to eighth pieces 341 to 348 of the divided mold 340 is the same as the outer circumferential surface shape of the inner elbow 210, and if continuously squeezed, the minimum spacing d is compressed during insertion. The inner circumferential surface of the outer elbow tube 220 that is plastically deformed is closely adhered to the outer circumferential surface of the inner elbow tube 210, which is referred to as a first compression step.

Next, when the first pressing step is completed, the double pipe is separated from the pressing device 300, and then the other end of the non-pressing double pipe is inserted into the pressing device 300 again as shown in FIG. The first to eighth pieces 341 to 348 of the divided mold 340 installed to correspond to the first to eighth pressing pieces 331 to 338 while the pressing guide 330 is retracted inwardly are also retracted and mounted at the same time. The outer circumferential surface of the other end of the outer elbow tube 220 is uniformly compressed, and the inner circumferential surface of the outer elbow tube 220 that is plastically deformed is closely adhered to the outer circumferential surface of the inner elbow tube 210, and the second compression step is performed. It is called.

Next, when the double pipe is pressed by the first and second pressing step, the cylinder rod 321 is restored and the split mold 340 and the pressing guide 330 are opened to the outside. As described above, the double pipe is removed from the crimping apparatus 300 in a state that is as wide as possible.

Next, as shown in FIG. 5 (f), the flange 230 is installed on both ends of the separated double pipe, and then the reinforcement pipe 250 which is a steel having a separate heat-treated abrasion resistance on the inner circumferential surface of each flange 220. Install by inserting this). That is, the inner circumferential surface of each flange 230 to be welded has a small diameter portion 231 having a diameter substantially the same as the outer peripheral surface of the inner elbow 210, and a larger diameter formed on the inner peripheral surface of the other end than the diameter of the small diameter portion 231. The part 232 is formed. The reinforcement pipe 250 is inserted and installed in the other end direction of the flange 230 formed as described above, and one end of the reinforcement pipe 250 has an outer small diameter part having substantially the same diameter as the small diameter part 231 of the flange 230. 251 and the other end includes an outer diameter portion 252 having a diameter substantially the same as that of the large diameter portion 232 of the flange 230. Then, in order to prevent the flanges 230 respectively installed at both ends of the double pipe from being separated, the fillet welding W is applied to the end of the flange 230 and the outer circumferential surface of the outer elbow tube 220.

In addition, the reinforcement pipe 250, in order to prevent easy wear by the concrete to be conveyed, it is preferable that the diameter of the inner peripheral surface once the same as the inner peripheral surface diameter of the inner tube 210.

In addition, the end face of the other end of the reinforcement pipe 250 and the end face of the other end which is not welded of each flange 230 may be located in substantially the same plane. This is because not only the connection work of the transfer pipe is easy, but also prevents the portion damaged by the concrete to be pushed if the reinforcement pipe 250 is more protruded or short.

FIG. 7 is a cross-sectional view of the double tube elbow of the second embodiment produced by the manufacturing method of FIG. 5.

The double pipe elbow 200 'of the second embodiment according to the present invention is a double pipe compressed by the crimping apparatus 100 from the step of inserting the inner elbow 210 as in the double pipe elbow 200 of the first embodiment. Since the step of separating from the compaction apparatus 100 is the same, the following procedure will be described below.

Both ends of the inner elbow 210 is preferably formed to protrude more than both ends of the outer elbow 220 in order to facilitate welding the flange 240 to each end of the separated double pipe. In addition, the inner circumferential surface of each flange 240 to be welded has a large diameter portion 241 having a diameter substantially the same as the outer circumferential surface of the outer elbow tube 220, and a diameter substantially the same as the outer circumferential surface of the inner elbow tube 210. The small diameter part 242 is formed. Therefore, in order to prevent separation of the flanges 240 respectively provided at both ends of the double pipe, fillet welding (W) is applied to the end of the flange 240 and the outer circumferential surface of the outer elbow tube 220.

When welding the flange 240, it is preferable that the end faces of both ends of the inner elbow 210 and the end faces of the other non-welded ends of the flange 240 are located at substantially the same plane. This is because the connection work of the transfer pipe is easy, and the inner elbow 210 is more protruded or shorter, it can effectively prevent the portion damaged by the concrete being pushed.

The double pipe elbows 200 and 200 'produced by the manufacturing method as described above are easy to manufacture and can be manufactured quickly, thereby improving productivity.

Although the present invention has been described as an embodiment for a 90 ° double tube elbow, the present invention is not limited thereto, and a double tube elbow of various angles may be manufactured. In order to manufacture the double pipe elbows of various angles as described above, by selectively replacing the divided mold according to the angle of the double pipe elbow, it is possible to manufacture a double pipe elbow of various shapes by one crimping device to improve the overall compatibility.

Embodiments of the present invention described above and illustrated in the drawings should not be construed as limiting the technical spirit of the present invention. The protection scope of the present invention is limited only by the matters set forth in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention, as will be apparent to those skilled in the art.

1 is a perspective view of an embodiment of the compression manufacturing apparatus of the double pipe elbow according to the present invention

2 is a cross-sectional view taken along the line A-A of FIG.

3 is a cross-sectional view taken along the line B-B of FIG.

Figure 4 is a cross-sectional view of the operating state of the compression manufacturing apparatus of the double tube elbow of the embodiment shown in FIG.

5 (a) to 5 (f) is a manufacturing method of the double pipe elbow using the compression production apparatus of the double pipe elbow according to the present invention.

6 is a perspective view of a double tube elbow of the first embodiment manufactured by the manufacturing method of FIG.

FIG. 7 is a cross-sectional view of the double tube elbow of the second embodiment manufactured by the manufacturing method of FIG.

<Short description of drawing symbols>

300 Crimping System 310 Main Body

320 cylinder 321 cylinder rod

330 Crimping Guide 331 ~ 338 1st pressure piece ~ 8th pressure piece

340 Divisional Molds 341 ~ 348 Part 1 ~ 8

350 Guide 351 Stopper

S spring b1, b2 first and second bolt

200,200 'Double Pipe Elbow 210 Inside Elbow Pipe

220 Outer elbow 230,240 flange

250 Reinforcement Pipe W Weld

Claims (14)

A main body having a receiving portion, A cylinder provided at one end of the accommodating part of the main body, the cylinder having a cylinder rod installed to be able to move forward and backward toward the other end of the accommodating part; A crimping guide having a plurality of pressing pieces which are divided in the circumferential direction and installed between the cylinder rod and the other end of the main body accommodating part, and are pushed inward when the cylinder rod moves forward and spread outward when the cylinder moves backward; A plurality of springs installed between opposite sides of the plurality of pressing pieces of the crimping guide, and installed to spread the plurality of pressing pieces to the outside by a restoring force when the cylinder rod moves backward; The outer circumferential surface which is divided in the circumferential direction and the outer circumferential surface is fixed to the plurality of pressing pieces of the crimping guide, respectively, and the cylinder rod is advanced and retracted inward, and the inner circumferential surface is divided into two elbows that are bent at a predetermined angle. A double pipe elbow crimping manufacturing device comprising a split mold divided into a plurality of pieces so as to have a shape. The method of claim 1, The outer circumferential surface of each of the divided molds forms a circumferential surface having a constant radius in the longitudinal direction when the split mold is formed, and the inner circumferential surface of each of the divided molds has a curved surface so that the shape of the cross-section in the longitudinal direction is formed by dividing the elbow tube into two parts. Double pipe elbow crimp production apparatus, characterized in that the shape. The method according to claim 1 or 2, Screw grooves respectively formed on the outer peripheral surfaces of the plurality of pieces of the divided molds; A first bolt having a screw portion formed at one end thereof to be detachably assembled to the screw groove, and having a head portion having a narrow diameter at the center portion at the other end thereof; A groove is formed at each inner circumferential surface of each of the pressing pieces of the crimping guide so as to accommodate the head portion of the first bolt, and the side of the head portion of the first bolt accommodated in the groove is pressurized so as not to be separated. Double pipe elbow compression manufacturing device comprising a second bolt installed to secure. The method of claim 3, The crimping guide is a plurality of press pieces divided into eight in the circumferential direction, and the split mold is composed of a plurality of pieces divided into eight in the circumferential direction to be installed on the plurality of press pieces, respectively. Manufacturing device. The method of claim 4, wherein At least one pressing piece of the plurality of pressing pieces, the double pipe elbow compression manufacturing apparatus further comprises a guide provided to support the outer peripheral surface of the double pipe elbow at one end. The method of claim 5, The guide is a double-pipe elbow compression manufacturing apparatus further comprises a stopper installed to support the end of the double-pipe elbow. Inserting an inner elbow tube made of heat-resistant wear resistant steel into the hollow of the outer elbow tube made of weldable steel; A first compression step of pressing the bisected one end of the outer elbow pipe bent at a predetermined angle with a plurality of divided molds divided in the circumferential direction so that the inner circumferential surface of the outer elbow pipe of one end is brought into close contact with the outer circumferential surface of the inner elbow pipe; And a second pressing step of pressing the bisected second end of the outer elbow pipe bent at a predetermined angle into a plurality of divided molds divided in the circumferential direction so that the inner circumferential surface of the outer elbow pipe of the other end is brought into close contact with the outer circumferential surface of the inner elbow pipe. A method for producing a double tube elbow, which is characterized by the above-mentioned. The method of claim 7, wherein The method of manufacturing a double pipe elbow, characterized in that it further comprises the step of welding the flanges on both ends of the outer elbow pipe. The method of claim 8, The one end inner peripheral surface of each flange, the small diameter portion having a diameter substantially the same as the outer peripheral surface of the inner elbow pipe, and the other end inner peripheral surface comprises a large diameter portion larger than the diameter of the small diameter portion. The method of claim 9, It is made of a wear-resistant steel that is inserted into the inner peripheral surface of the other end of the flange and heat treated, one end of the outer diameter having a diameter substantially the same as the small diameter portion of the flange, the other end of the outer diameter having substantially the same diameter as the large diameter portion of the flange Method for producing a double pipe elbow, characterized in that it comprises a reinforcing pipe formed of a large diameter portion. The method of claim 10, One end inner circumferential diameter of the reinforcing pipe is a method of manufacturing a double pipe elbow, characterized in that substantially the same as the inner diameter of the inner circumferential surface of the inner elbow pipe. The method of claim 11, And an end face of the other end of the reinforcement pipe and each other end face of the flange that is not welded are substantially in the same plane. The method of claim 8, And an end face of both ends of the inner elbow tube and an end face of the other end of the pair of non-welded ends of the pair of flanges located in substantially the same plane. An outer elbow tube made of weldable steel, An inner elbow tube made of a wear-resistant steel inserted into a hollow of the outer elbow tube, A pair of flanges welded to both ends of the outer elbow, A double pipe elbow, wherein the outer elbow pipe bent at a predetermined angle is bisected and squeezed into a plurality of divided molds, so that the inner circumferential surface is in close contact with the outer circumferential surface of the inner elbow tube.

Images