KR100776052B1 - Manufacturing device of oval duct - Google Patents

Abstract

A continuous manufacturing device for an oval duct is provided to prevent a steel sheet from being wasted unnecessarily by cutting the steel sheet into two parts along a length direction of the steel sheet. A continuous manufacturing device for an oval duct comprises a steel sheet supply unit(10), a folding unit(20), a bending unit(30), a bonding unit(50), a correcting unit(60), and a cutting unit(80). The steel sheet supply unit cuts a steel sheet into two parts along length direction of the steel sheet to feed. The folding unit includes a top roller and a bottom roller. The rollers have molding grooves and molding protrusions to form reinforcing grooves on the steel sheet at regular intervals. The bending unit has a plurality of top and bottom folding rollers and a plurality of direction changing rollers. Both folding rollers make semi-finished oval product of a semi-circular shape by pushing the center of the steel sheet conveyed to the folding unit. The direction changing rollers rotates the semi-finished oval product by 90° around the processing direction of the steel sheet. The bonding unit has pairs of folding rollers with grooves having shapes different from each other. The folding rollers are installed successively on a route where two ends of the oval duct pass by. The correcting unit has a pair of correction rollers and at least one correcting member. The correction rollers have grooves conveying the oval duct and adhere to the two outer surfaces of the oval duct conveyed from the bonding unit. The correcting member rotates around a shaft, adhering to two inner surface of the oval duct. The cutting unit cuts the oval duct conveyed from the correcting unit at a regular interval.

Description

Manufacturing device for continuous manufacture of oval ducts

1 is a schematic view of a manufacturing apparatus for the continuous production of a false duct according to the present invention.

Figures 2a and 2b and 2c is a perspective view and a side cross-sectional view of a bending unit for forming a reinforcement groove for forming a reinforcement groove in the disc in the present invention and a perspective view of a semi-finished false duct manufactured thereby.

Figure 3 is a schematic diagram showing the arrangement of a plurality of rollers in the bending unit of the present invention.

4A to 4F are schematic views showing the installation state of the bending roller and the direction changing roller in the bending unit of the present invention.

Figure 5 is a perspective view of a semifinished bale duct made by the bending unit of the present invention.

Figure 6 is a front view of the pressurizing unit for pressurizing the semifinished product oval duct in a perfect elliptical shape in the present invention.

FIG. 7 is a perspective view showing a bonding unit for bending two semifinished product ducts in the present invention and joining them to one blast duct. FIG.

8A is a schematic view showing a first bending roller of a joining unit.

8B is a schematic view showing a second bending roller of the joining unit.

8C is a schematic view showing a third bending roller of the joining unit.

8D is a schematic view showing a fourth bending roller of the joining unit.

8E is a schematic view showing a finish bending roller of a joining unit.

Fig. 9A is a schematic diagram showing a semifinished product oval duct 36 before being joined by a roller type joining unit.

Fig. 9B is a schematic view showing an oval duct integrally joined by a roller type joining unit.

10 is a schematic view showing a calibration unit of the present invention.

11 is a view for explaining the seam welding method.

-Explanation of symbols for the main parts of the drawings

10: disc supply unit 11: base

12: axis 13: disc

20: bending unit for reinforcing groove forming 21: upper roller

22: lower roller 23: forming groove

24: forming protrusion 25: reinforcing groove

30: bending unit 31a, 31b, 31c: upper bending roller

32a, 32b, 32c: lower bending roller 33a, 33b, 33c: bending groove

34a, 34b, 34c: direction change rollers 35a, 35b, 35c: guide groove

36: semifinished product duct 40: pressurizing unit

41, 42, 71, 72: pressure roller 50: bonding unit

51 frame 52: first bending roller

53: second bending roller 54: third bending roller

55: fourth bending roller 56: finishing bending roller

57: overlap prevention plate 58: connection member

60: calibration unit 61, 63: roller

62, 64: groove 65: calibration member

66: member 67: plate

68: shaft 80: cutting unit

82 sensor 83 cutting blade

90 Seam Welder 91: Welder

92 electrode

The present invention relates to a manufacturing apparatus for the continuous production of the oval duct is installed on the ceiling in various buildings for the smooth ventilation of indoor air. In particular, the present invention is to cut the disc continuously fed from the reel in half along the longitudinal direction and to form a reinforcement groove therein to form a semi-finished semi-finished duct fold and then bend or joint the end of the semi-finished blast duct bent in an elliptical shape The present invention relates to a manufacturing apparatus for the continuous manufacture of a false duct by allowing the semi-finished product ducts bent or partially overlapped to be overlapped and welded by seam welding or argon welding.

In general, the duct is installed on the ceiling of the building to provide a separate ventilation device to facilitate the ventilation of the room, and serves as a passage for discharging the indoor air or supplying fresh air to the inside of the building. Most of the thin metal plate made of metal is made in a circle or a square, which is made of a certain length to facilitate transportation and installation, it is generally used to be cut to the installation location directly in the installation place.

Conventional square ducts and circular ducts are fixedly installed in the interior of the building, in particular the ceiling, the ducts have a constant diameter (height) to act as an important factor to determine the height of the beam of the building, there is a problem that the spatial constraints. For example, in the case of a new building, since the height of the room is designed in consideration of the diameter of the duct, a large problem does not occur when installing. However, the existing building was constructed with lower beam height without considering this, so the height of ceiling is also lowered. Therefore, indoor ventilation is not used because a wide diameter duct with sufficient ventilation capacity is not used. It doesn't go smoothly.

In order to solve the conventional problems as described above, in recent years, there is a tendency to use an duct having superior space utilization than square ducts or circular ducts, as well as less heat loss and friction loss, and smooth and refined aesthetics.

Looking at the manufacturing technique of the blast duct as described above, to manufacture the shape of the blast duct by manual method or by using a simple manual manufacturing machine to proceed to a separate operation one by one for each process of work efficiency There is a problem such as lowering the competitiveness of the product due to degradation, lower productivity, and lower quality.

Republic of Korea Utility Model Publication No. 1996-1805 manufactures a straight false duct in which a circular duct passes through an oval duct manufacturing apparatus, and expands the oval duct whose shape has been converted in the longitudinal axis direction so that the upper and lower surfaces of the uniaxial direction are converted into straight lines. It relates to a straight oval duct manufacturing apparatus for. In addition, the Republic of Korea Utility Model Publication No. 195-16961 is a molding apparatus used in the intermediate process for changing the cross-sectional shape of the circular duct to finally produce a straight oval duct as an oval duct that makes the cross-sectional shape of the circular duct an ellipse. This is to prevent overloading of the machine and to expand the duct smoothly when forming the final stage of straight oval duct by molding.

The prior art as described above compresses and expands the manufactured circular ducts, and thus the process of changing the shape is added to the manufacturing process of the circular ducts. There is a limit to the manufacturing method according to the exact shape.

In addition, the conventional method of manufacturing a false duct by applying pressure to a circular duct requires setting a new pressure when attempting to manufacture a false duct of a different length from the false duct. It is difficult and this makes it difficult to manufacture oval ducts of various sizes as a device.

The present invention for solving the problems arising in the manufacturing process of the conventional oval duct as described above is cut in half along the longitudinal direction of the disk continuously supplied from the reel to form a reinforcement groove therein to the semi-finished product oval duct After manufacturing, the end of semi-finished product duct bent in elliptical shape is bent or joined or overlapped or overlapped part of semi-finished product duct bent in elliptical shape is welded by seam welding or argon welding. It is an object of the present invention to provide a manufacturing apparatus for the continuous production of the oval duct to be able to manufacture continuously.

In addition, the present invention is used for the continuous production of the blast duct to minimize the unnecessary loss of the disc by using a disc for manufacturing the blast duct by cutting in half in the longitudinal direction without using the disc supplied from the reel as it is It is an object to provide a manufacturing apparatus.

In order to achieve the above object, the manufacturing apparatus for the continuous production of the blasting duct according to the present invention, a disk supply unit for cutting and supplying the disc to be manufactured in the longitudinal direction of the disc to produce the blast duct; An upper roller having a forming groove and a forming protrusion corresponding to the forming groove on the outer diameter surface of each roller in a direction perpendicular to the conveying direction of the disk so that reinforcing grooves are formed at regular intervals from the disk supply unit. A bending unit for forming a reinforcement groove including a lower roller; Pressing the central portion in the longitudinal direction of the disc conveyed from the bending unit for forming the reinforcing groove forming a plurality of upper and lower bending rollers for forming a semi-elliptical semifinished product duct and rotating the semifinished product duct 90 degrees about the traveling direction A bending unit including a direction change roller; Bonding unit including a plurality of upper and lower pairs of bending rollers are continuously installed in the place where both ends of the semi-finished product duct to be joined to pass through to join the two ends of the semi-finished product duct passing through the bending unit ; A pair of right and left straightening rollers formed in close contact with both outer surfaces of the misaligned duct conveyed from the joint unit and having grooves for conveying the misconducted duct, and at least one straightening member rotated about an axis in close contact with both inner surfaces of the misaligned duct Calibration unit comprising a; And a cutting unit for cutting the oval duct transferred from the calibration unit at regular intervals.

In addition, the manufacturing apparatus for the continuous production of the blast duct according to the present invention, the disc supply unit for cutting and supplying the disc to be produced in the longitudinal direction of the disc to produce the blast duct; An upper roller having a forming groove and a forming protrusion corresponding to the forming groove on the outer diameter surface of each roller in a direction perpendicular to the conveying direction of the disk so that reinforcing grooves are formed at regular intervals from the disk supply unit. A bending unit for forming a reinforcement groove including a lower roller; Pressing the central portion in the longitudinal direction of the disc conveyed from the bending unit for forming the reinforcing groove forming a plurality of upper and lower bending rollers for forming a semi-elliptical semifinished product duct and rotating the semifinished product duct 90 degrees about the traveling direction A bending unit including a direction change roller; In order to join both ends of the semifinished product duct passing through the bending unit, it is continuously installed where both ends of the semifinished product duct are joined to each other. A welding unit welded by a welding unit, a pair of left and right calibration rollers formed in close contact with both outer surfaces of the blasting duct conveyed from the welding unit, and a groove for conveying the ducting duct; A calibration unit comprising one or more calibration members rotated; And a cutting unit for cutting the oval duct transferred from the calibration unit at regular intervals.

Also, in the present invention, the process of integrally joining or welding two semifinished product ducts is performed by simultaneously joining or welding the upper and lower ends of the semifinished product duct or by joining or welding the upper and lower ends of the semifinished product duct with a time difference. It is preferable to make.

Hereinafter, the present invention will be described in detail.

The manufacturing apparatus for the continuous manufacture of the oval duct according to the present invention, as shown in Figure 1, the disc supply unit 10 and the bending unit for forming the reinforcement groove 20, the bending unit 30, the pressure unit 40 ) 70, a bonding unit 50, a calibration unit 60, a cutting unit 80, and the like.

The disc supply unit 10 is a device for supplying a disc for producing an oval duct by releasing the disc at a constant speed, the disc 13 in the form of a coil is wound around the shaft 12 horizontally installed on the base 11, Since the drive gear of the motor is meshed with the interlocking gear of the shaft 12, the disc 12 is rotated by the rotation of the motor so that the disc 13 is released at constant speed.

Here, the original plate 13 wound on the shaft 12 is a plate such as a galvanized iron plate galvanized iron plate or a steel plate weldable by seam welding or argon welding, etc., is manufactured in the form of a false duct and then plated with zinc. Various paints can be painted to look beautiful without rust.

Although not shown in the drawing, between the disc supply unit 10 and the bending unit 20 for forming the reinforcement groove forming cutting means for cutting the disc 13 supplied from the disc supply unit 10 in half along the longitudinal direction. Since it is installed, the disc 13 cut in half is supplied to the bending unit 20 for reinforcing groove forming. This is to prevent unnecessary loss of the original plate (13).

2A shows a bending unit 20 for forming a reinforcement groove for forming a reinforcement groove in the disc 13 according to the present invention, and a pair of upper rollers 21 and a lower roller 22 disposed up and down to abut each other. It consists of.

The upper roller 21 has a forming groove 23 for forming a reinforcing groove, and the lower roller 22 has a forming protrusion 24 corresponding to the forming groove 23, so as shown in FIG. Each time the upper roller 21 and the lower roller 22 rotates one by one, the forming protrusions 24 of the lower roller 22 are inserted into the forming grooves 23 of the upper roller 21, as shown in FIG. 2C. The reinforcement groove 25 of the U-shape 13 is formed at a predetermined interval.

The upper roller 21 or the lower roller 22 rotates by driving means, such as a motor which is not shown in figure. The reason why the reinforcing groove 25 is formed in the disc 13 is that the flat upper and lower portions of the flat oval duct are relatively weak in pressure as compared to the circular duct. The spacing of the reinforcing grooves 25 formed in the plate may vary depending on the diameter of the rollers 21 and 22 and the number of the forming grooves 23 and the forming protrusions 24 formed in the rollers 21 and 22. The denser the groove 25 is, the greater the reinforcing effect.

Of course, it is preferable that the reinforcing groove 25 is not formed in the disc 13 to form a bending joint, a welding, or a curved surface in order to manufacture an duct having an accurate shape.

FIG. 3 shows an elliptical shape of two discs 13 cut in half as a bending unit 30 for forming a disc 13 having a reinforcement groove 25 formed into an elliptical semifinished oval duct 36 at a predetermined interval. A plurality of rollers in which a pair of upper bending rollers 31a, 31b, 31c and lower bending rollers 32a, 32b, 32c for forming a mold, and a roller 34a for switching the direction thereof ( 34b) 34c.

That is, when the disc 13 passes between the first to third lower rollers 32a, 32b and 32c and the first to third upper rollers 31a, 31b and 31c, the upper part of the disc 13 Presses the first to third upper rollers 31a, 31b and 31c so that the middle portion is inserted into the first to third bending grooves 33a, 33b and 33c, so that the plate-shaped disk 13 is gradually It is molded into an oval semifinished product duct 36.

To this end, the first to third bending grooves 33a, 33b and 33c formed in the first to third lower rollers 22a, 32b and 32c are the first bending grooves as shown in Figs. 4A to 4C. It is preferable that the depth becomes deeper and the width narrows so as to be equal to or close to the upper and lower widths of the oval duct to be manufactured from 33a to the third bending groove 33c.

The semifinished product oval duct 36 thus formed as shown in FIG. 5 has the first to third guide grooves 35a of the first to third direction turning rollers 34a, 34b and 34c for the next process. (35b) and 35c are transported by 90 degrees around the advancing end of the semi-finished product duct 36 while facing each other.

To this end, the first to third direction turning rollers 34a, 34b and 34c having the first to third guide grooves 35a, 35b and 35c are semi-finished oval ducts as shown in Figs. Since the angle of inclination of different angles, that is, 30 degrees, 60 degrees, and 90 degrees around the traveling direction of 36, the direction of the semifinished product oval duct 36 is gradually changed. That is, the open portions of the two semifinished false ducts 36 face each other for the smooth progress of the next process.

The first to third upper bending rollers 31a, 31b and 31c or the first to third lower bending rollers 32a, 32b and 32c and the first to third turning rollers 34a described above. 34b and 34c may be designed to rotate by the passing force of the disk 13, but it is preferable to rotate the disk 13 by a separate power source such as a motor for smooth transfer and molding of the disk 13. In the above embodiment, the first to third upper bending rollers 31a, 31b and 31c or the first to third lower bending rollers 32a, 32b and 32c, and the first to third direction turning rollers. Although the number of (34a) (34b) and 34c (3) has been described as an example, the present invention is not limited to this, and the larger the number, the more the shape of the false duct can be formed with less force.

6 is a pressure unit 40 composed of a pair of pressure rollers 41 and 42 arranged up and down, which can also be driven by a power source such as a motor.

The semi-finished product duct 36 formed through the above process is passed through the pressing rollers 41, 42 arranged at regular intervals up and down while the upper and lower parts of the semi-finished product duct 36 are pressed down perfectly flat oval Has the shape of.

FIG. 7 shows a joining unit 50 for bending two semifinished product ducts 36 obtained through the above process and joining them into a single blast duct, in which two rollers arranged up and down are paired. Many rollers 52, 53, 54, 55 and 56 are provided continuously.

Hereinafter, only the bending of the upper part of the semi-finished oval duct 36 will be described as an example, but the present invention is not limited thereto, and the rollers 52, 53, 54, 55, 56 are arranged up and down. It is also possible to bend and join the upper and lower portions of the semifinished product false duct 36 simultaneously by configuring three rollers.

The present invention also provides a plurality of rollers 52, 53, 54, 55 and 56 for bending and joining the upper part of the semifinished oval duct 36 and the lower part of the semifinished oval duct 36. The rollers 52, 53, 54, 55 and 56 may be continuously arranged to cross each other to bend and join the upper and lower portions of the semifinished product duct 36 at the same time.

Of course, in the present invention, in addition to the above two methods, the upper part of the semifinished product duct 36 is bent and joined by the rollers 52, 53, 54, 55, 56, which will be described below. It is also possible to use a method of bending the bottom of the semifinished oval duct 36 using the rollers 52, 53, 54, 55 and 56 of the structure.

Hereinafter, the method of bending the semifinished product duct 36 to be integrally bonded is performed by the same process with respect to the upper and lower portions of the semifinished product duct 36, thereby bending the upper part of the semifinished product duct 36 to be integrally joined. Only the method will be described in detail.

First, the overlap prevention plate 57 is disposed at a portion before the semifinished product oval duct 36 passes the first bending roller 52. The overlap prevention plate 57 is a vertical plate which rises upwards and is a semi-finished product oval duct ( When the 36 is folded by the pressure rollers 41 and 42, the function of preventing the semi-finished product oval duct 36 from entering the first bending roller 52 of the joining unit 50 in a state where both ends overlap with each other. Do it.

Here, of the pair of rollers disposed above and below each of the rollers 52, 53, 54, 55, 56 of the bonding unit 50, the upper roller is a roller driven by a driving means, and the lower roller is It is a roller that is not supplied with power separately. The lower roller is rotatably installed in the frame 51 connected to the ceiling. The left and right side surfaces of the frame 51 on which the lower roller is installed have a shape corresponding to the curved portion of the semifinished product oval duct 36 because the curved portion of the semifinished product oval duct 36 is in contact with each other.

The semi-finished product oval duct 36 formed in a flat oval shape passing through the pressure rollers 41 and 42 of the pressure unit 40 has a first end in which both ends of the semi-finished product oval duct 36 to be bonded are shown in FIG. 8A. Each bent obliquely in the opposite direction while passing through the bending roller 52. Then, while passing through the L-shaped second bending roller 53 shown in Fig. 8B, the bent ends of the semifinished product oval duct 36 are bent at right angles to opposite directions, respectively. After passing through the second bending roller 53, both ends to be bonded are separated from each other by a predetermined length so that the connecting member 58 of the frame 51 in FIG. After the semifinished product oval duct 36 passes through the connecting member 58 of the frame 51, the operator can move both bent portions 101 and 102 of the semifinished product oval duct 36 bent at a right angle to that shown in FIG. 9A. Let them hang on each other. At this time, the first and second bending rollers (52) and the second bending rollers (left and right) to press the pair of left and right pressing rollers to press the semi-finished product oval duct (36) from side to side in order to make both bending portions 101 and 102 easily touch each other It is preferable to install between 53).

The bending portions 101 and 102 overlapped with each other by the above process are the third Z-shaped bending roller 54 of FIG. 8C and the fourth bending roller 55 having the flat grooves shown in FIG. 8D. The flat bending roller 56 shown in FIG. 8E is pressed while passing through and the edges of the joint portions are raised so that the bent portions 101 and 102 of the pressed state are not released from each other. Thus, the semifinished product oval duct 36 passing through the finishing bending roller 56 becomes an oval duct product having a shape as shown in Fig. 9B.

As described above, a welding machine for welding by a method such as seam welding or argon welding may be used instead of the bonding unit 50 provided with rollers continuously.

Here, seam welding is a method in which one continuous line-shaped joint is obtained by continuously applying spot welding while pressing and energizing two plates between disk-shaped roller electrodes and rotating the electrode to rotate the plate. Used for joints requiring watertightness and oiltightness.

Fig. 11 shows the configuration of a seam welding machine 90, which is one of electric resistance welding for welding the semifinished product oval duct 36, and has a semifinished product between a pair of disk-shaped rotary electrodes 92. The oval duct 36 is pressurized and energized, and the electrode 92 is rotated to obtain one continuous line-shaped weld 91 by continuously repeating spot welding while moving the semifinished product oval duct 36. It is a welding method, and is generally used for welding manufacture of tanks, automobile parts, and pipes which require watertightness, oil tightness, and airtightness.

Continuously energizing a large current during seam welding may result in excessive heat or excessive heat, and the entire welding part may melt or dent due to such overheating. This is used a lot. In this seam welding, the electrode itself generates a lot of heat due to the heat generation by current conduction during welding, so it must be forced to cool to minimize the problems such as large electrode consumption due to overheating of the electrode, frequent electrode replacement and poor welding. can do.

That is, the seam welding is to conduct a high current to the disk rotating electrode 92 as shown in the example of Figure 11 to perform the welding by the resistance heat, the heat generation temperature at this time is about 1,500 ~ 1600 ℃ . Rotating electrode 92 used for seam welding is mainly made of chromium copper (Cu-Cr) material in order to withstand high current energization, mechanical pressure, and frictional force, and the electrode of chromium copper material has a temperature of about 400 ° C. The higher the temperature, the softer the electrode starts to soften. In addition, phenomena such as fusion between the electrode and the plate (welded material), separation of welds, spark generation, and the like, greatly reduce the welding quality, and require frequent electrode replacement. And as the temperature of the electrode increases, the resistance of the electrode itself increases, so that a larger amount of current is required to obtain the same welding state for the product under the same conditions, so that the electrode is not overheated to a temperature higher than the temperature during welding. It is desirable to make it.

Next, argon welding (TIG welding, abbreviated tungsten inert gas, tungsten inert gas) for welding the semi-finished product oval duct 36 with both ends abutted or partially overlapped between the tungsten electrode having the highest melting point and the plate (base metal) It is a method of protecting the welding part with argon (Ar) gas to cause arcing and prevent oxidation and nitriding during welding. The argon welding is mainly used for welding stainless steel and aluminum. When aluminum is exposed to air, the surface becomes aluminum oxide. This aluminum oxide has a higher melting point than pure aluminum, thereby preventing welding. To remove this aluminum oxide, weld with an argon welder in reverse DC or alternating current.

Thus, the oval duct, which is integrally joined by a joining unit 50 having a plurality of rollers or by a welding method, is maintained in shape through the calibration unit 60 shown in FIG. The calibration unit 60 consists of a pair of left and right vertical rollers 61 and 63 and two rotatably mounted calibration members 65 disposed therebetween. The left and right rollers 61 and 63 are rollers driven by driving means such as a motor, not shown, and the internal calibration member 65 is not supplied with power separately. Each of the straightening members 65 is rotatably installed at both ends of the shaft 68 provided on the plate 67, the two hemispherical members 66 across the center. As shown in FIGS. 1 and 7, the plate 67 on which the shaft 68 of the straightening member 65 is installed extends from the end of the frame 51 supporting the lower rollers of the joining unit 50.

In the calibration unit 60, grooves 62 and 64 corresponding to the left and right curved surfaces of the oval duct are dug in the rollers 61 and 63 on both sides, and the correction member 65 also corresponds to the left and right curved surfaces of the oval duct. Since the outer surface of the oval duct is in close contact with the left and right rollers (61, 63) and the inner surface of the oval duct is in close contact with the correction member (65) serves to maintain the correct shape and maintain the oval duct.

Thus, the oval duct passing through the calibration unit 60 passes through the upper and lower pair of pressure rollers 71 and 72 of the pressure unit 70 as shown in FIG. The calibration unit 60 maintains the shape of the curved portion of the misaligned duct, while the pressure rollers 71 and 72 as shown in FIG. 6 press the flat portion of the misaligned duct to maintain the shape of the flat portion.

The blast duct passing through the pressure rollers 71 and 72 is finally supplied to the cutting unit 80. When the laser sensor 82 detects the duct duct, the false duct is cut by the cutting blade 83 of the cutting unit 80. The product is completed by cutting every certain length.

By repeating the above series of operations, an oval duct product of a constant shape and length is continuously manufactured.

Therefore, according to the present invention, the disc continuously fed from the reel is cut in half along the longitudinal direction and formed with reinforcement grooves to make an elliptical semifinished product duct and then bend and join the ends of the semifinished product ducts that are bent in an elliptical shape. By contacting or partially overlapping the semi-finished oval duct bent in an elliptical shape, it is possible to rapidly and continuously manufacture a high-quality oval duct having a predetermined shape by welding by seam welding or argon welding.

In addition, the present invention has the effect of minimizing the unnecessary loss of the disc by using the disc to cut in half in the longitudinal direction instead of using the disc supplied from the reel as it is in the longitudinal direction to manufacture the duct duct.

Although the present invention has been described in detail only with respect to the specific embodiments described, it will be apparent to those skilled in the art that various changes and modifications are possible within the technical scope of the present invention, and such modifications and modifications belong to the appended claims. .

Claims (4)

A disc supply unit for cutting and supplying a disc to produce an oval duct in half along the longitudinal direction of the disc; An upper roller having a forming groove and a forming protrusion corresponding to the forming groove on the outer diameter surface of each roller in a direction perpendicular to the conveying direction of the disk so that reinforcing grooves are formed at regular intervals from the disk supply unit. A bending unit for forming a reinforcement groove including a lower roller; Pressing the central portion in the longitudinal direction of the disc conveyed from the bending unit for forming the reinforcing groove forming a plurality of upper and lower bending rollers for forming a semi-elliptical semifinished product duct and rotating the semifinished product duct 90 degrees about the traveling direction A bending unit including a direction change roller; Bonding unit including a plurality of upper and lower pairs of bending rollers are continuously installed in the place where both ends of the semi-finished product duct to be joined to pass through to join the two ends of the semi-finished product duct passing through the bending unit ; A pair of right and left straightening rollers formed in close contact with both outer surfaces of the misaligned duct conveyed from the joint unit and having grooves for conveying the misconducted duct, and at least one straightening member rotated about an axis in close contact with both inner surfaces of the misaligned duct Calibration unit comprising a; And Cutting unit for cutting the oval duct transported from the calibration unit at regular intervals; Manufacturing apparatus for the continuous manufacture of the oval ducts comprising a. A disc supply unit for cutting and supplying a disc to produce an oval duct in half along the longitudinal direction of the disc; An upper roller having a forming groove and a forming protrusion corresponding to the forming groove on the outer diameter surface of each roller in a direction perpendicular to the conveying direction of the disk so that reinforcing grooves are formed at regular intervals from the disk supply unit. A bending unit for forming a reinforcement groove including a lower roller; Pressing the central portion in the longitudinal direction of the disc conveyed from the bending unit for forming the reinforcing groove forming a plurality of upper and lower bending rollers for forming a semi-elliptical semifinished product duct and rotating the semifinished product duct 90 degrees about the traveling direction A bending unit including a direction change roller; In order to join both ends of the semifinished product duct passing through the bending unit, it is continuously installed where both ends of the semifinished product duct are joined to each other. Welding unit welding by A pair of left and right calibration rollers formed with grooves for conveying the duct in contact with both outer surfaces of the blast duct transported from the welding unit, and at least one calibration member rotated about an axis in close contact with both inner surfaces of the blast duct Calibration unit comprising a; And Cutting unit for cutting the oval duct transported from the calibration unit at regular intervals; Manufacturing apparatus for the continuous manufacture of the oval ducts comprising a. The process of claim 1, wherein the step of integrally joining the two semifinished product ducts in the joining unit is performed by simultaneously joining the upper and lower ends of the two semifinished product ducts or time difference between the upper and lower ends of the two semifinished product ducts. Manufacturing apparatus for the continuous manufacture of the oval duct, characterized in that the bonding is made with. The process of claim 2, wherein the welding unit integrally welds the two semifinished product ducts together by welding the upper and lower ends of the two semifinished product ducts at the same time or time difference between the upper and lower ends of the two semifinished product ducts. Manufacturing apparatus for the continuous manufacture of the oval duct, characterized in that made by welding.

Images