KR101507217B1 - Apparatus for forming flange of double pipe - Google Patents

Abstract

The present invention relates to a forming apparatus capable of precisely forming a flange of a communication pipe made up of a double pipe of an inner pipe and an outer pipe at an angle of 90 °.
The present invention eliminates the contact with the pipe by improving the shape of the upper roller during forming for flange forming of the pipe, and uses the spring force to form the flange forming portion between the upper roller and the lower roller, The present invention provides a flanged forming apparatus of a communicating double pipe capable of improving the forming efficiency and securing excellent forming quality by realizing a new type of forming system capable of forming a flange having an angle of 90 ° with accuracy.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a double-

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a flange forming apparatus for a communication double tube, and more particularly, to a forming apparatus capable of accurately forming a flange of a communication pipe made up of an inner pipe and an outer pipe at an angle of 90 degrees.

Generally, communication is a gas passage installed in various heat source devices including a boiler for discharging combusted gas.

Such a communication is made in various diameters according to the kinds and specifications of various heat source devices, and the capacity thereof is determined.

In particular, the double pipe communication is installed inside or outside of the building to discharge the combusted gas to the outside. Therefore, in order to prevent the breakage by improving the rigidity of the cold wave or the external force of the cold weather, It is made of tubular body.

For example, as shown in FIGS. 1A and 1B, the double pipe communication is constituted by an inner pipe 100 and an outer pipe 110, and between the inner pipe 100 and the outer pipe 110 at this time, A heat insulating air layer 120 for performing heat insulation of the communication is formed.

In addition, since the gap holding hole 130 is provided between the inner tube 100 and the outer tube 110, the heat insulating air layer 120 can be held.

A flange 140 is formed at an end of the inner pipe 100 for connection between the two pipes and the flange 140 is connected to a band clamp 150 or the like to complete a communication double pipe having a predetermined length do.

The flanges which are brought into contact with each other when these communicating double pipes are connected are usually formed by a flange forming apparatus.

2 is a front view of a conventional communicating double pipe flange forming apparatus.

2, the flange forming apparatus includes a circular chuck 10 for setting the inner tube 100, a motor (not shown) for rotating the chuck 10, a horizontal The upper slider 13 and the lower slider 14 capable of linearly moving while supporting the upper roller 11 and the lower roller 12 in the vertical posture while supporting the upper roller 11 and the lower roller 12, And an upper cylinder 15 and a lower cylinder 16 for operating the upper and lower sliders 13 and 14.

Here, reference numerals 17 denote slider blocks for guiding the movement of the upper and lower sliders 13 and 14.

3 and 4, when the inner tube 100 is vertically fitted and set around the chuck 10, the operation of the upper cylinder 15 causes the upper slider 13 and its tip The upper roller 11 moves forward to come into contact with the outer surface of the lower end of the inner tube 100 and the lower slider 14 and the lower roller 12 move backward by the operation of the lower cylinder 16, The inner tube 100 is rotated by the rotation of the chuck 10 in this state and the upper and lower rollers 11 and 12 are rotated by the rotation of the inner tube 100, The flange 140 can be formed around the entire inner tube.

However, in the conventional flange forming apparatus, since the inner tube is rotated while the upper roller keeps close contact with the outer surface of the inner tube while the flange forming is performed, the load is received by the contact interference between the inner tube and the inner tube, In particular, in order for the lower roller to enter, there must be a gap larger than the thickness of the inner pipe between the upper roller and the upper roller. Since the flange is not formed at 90 degrees due to the lifting phenomenon caused by this gap There is a disadvantage in that the quality of the foaming is deteriorated.

That is, when the forming operation is performed in a state in which the flange forming part is not completely adhered to the upper and lower rollers due to the lifting phenomenon due to the gap between the upper roller and the lower roller, the forming surface is rough and the end of the flange forming part is bent, There is a difficulty in securing quality.

As a result, due to such defective forming, adjacent flanges do not come close to each other at the time of tightening the communication, so band tightening is not easy and tightness is difficult to maintain. .

Korean Patent Laid-Open No. 10-2008-0048278 (Pressing device for flange forming, published on Jun. 2, 2008) Korean Unexamined Patent Publication No. 1996-003835 (a bending-molded article having a flange, a molding apparatus thereof and a molding method thereof, published on Feb. 23, 1996) Korean Unexamined Patent Application Publication No. 10-2006-0116471 (press apparatus for flange forming, published on November 15, 2006)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a method of manufacturing a flange- The flange forming part can be formed in a state in which the flange forming part between the flange forming part and the flange forming part is completely in close contact with each other so as to form a flange having an angle of 90 °. The present invention provides a flanged forming apparatus for a communication double tube.

In order to achieve the above object, the present invention provides a communication double tube flange forming apparatus having the following features.

The flange forming apparatus basically includes a circular chuck for setting the pipe, a motor for rotating the chuck, an upper roller and a lower roller in a vertical posture for flange forming, and a lower roller that supports the upper and lower rollers, The upper and lower cylinders, and the upper and lower cylinders. In particular, the upper roller is installed on a rotatable roller block while being supported on the upper slider through a pin, And the upper roller installed on the roller block can be brought into close contact with the lower roller side through the flange forming part while being always subjected to a tension force in a downward direction in which the lower roller exists, .

Here, the tension device includes a holder connected to the roller block, a screw member extending through the bracket of the slider block while being extended from the rear surface of the holder, and a plurality of nut members fastened to the screw member to regulate the position thereof And a spring mounted around the screw member to elastically support the entire screw member including the holder.

At this time, it is preferable that the spring of the tension device is mounted between the front surface of the bracket in the slider block and the nut member on the screw member at the front position thereof so that the tension can be adjusted according to the position of the nut member Do.

In addition, the roller block of the tension device may further include a stopper pin for regulating a position of the roller block while being moved along a slot formed in the upper slider.

The upper surface of the upper roller may be inclined at a predetermined angle with respect to a vertical line so that the upper roller may be in line contact with the outer surface of the tube at the time of forming through the edge portion of the inclined surface.

In addition, in the case of the slider block, it is preferable that the slider block is coupled to the screw side rotated by the screw motor so as to be able to change its position.

The flange forming apparatus of the communicating double pipe provided in the present invention has the following advantages.

First, by using the pivoting structure of the upper roller, forming is performed in a state of being in close contact between the flange forming portion and the upper and lower rollers, so that the forming quality such as a flange having an angle of 90 degrees can be formed, The airtightness of the connection portion of the communication double tube and the band tightening workability can be improved.

Second, by improving the shape of the upper roller having the inclined front surface, it is possible to eliminate the contact with the pipe, thereby improving the efficiency of the forming operation such as eliminating various loads due to contact and friction.

Thirdly, since the flange forming part forms a complete contact state with the rotational force between the upper roller and the lower lower roller, which are supported by the elasticity of the spring, the processed surface becomes uniform and smooth, thereby further securing the airtightness at the time of lamination.

1A and 1B are a perspective view and a cross-sectional view showing a structure of a common communicating double pipe;
2 is a front view showing a flange forming apparatus of a conventional communicating double pipe.
3 and 4 are front views showing an operating state of a flange forming apparatus of a conventional communicating double pipe
5 is a front view showing a flange forming apparatus of a communication double tube according to an embodiment of the present invention.
6 is a partial enlarged view of a flange forming apparatus of a communication double tube according to an embodiment of the present invention.
7 to 9 are front views showing an operating state of a flange forming apparatus of a communication double tube according to an embodiment of the present invention.

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

FIG. 5 is a front view showing a flanged forming apparatus for a communication double tube according to an embodiment of the present invention, and FIG. 6 is an enlarged view of a main part of a flanged forming apparatus for a communication double tube according to an embodiment of the present invention.

As shown in FIGS. 5 and 6, the flange forming apparatus can form a flange to be formed therebetween at an angle of 90 degrees with a perfect contact structure of the upper roller 11 and the lower roller 12 .

For this purpose, a circular chuck 10 for setting the inner tube 100 of the tube to be formed, for example, a communicating double tube is provided, and the chuck 10 at this time is rotated by the lower motor 18 And the like.

Four free rollers 33 are disposed at the lower portion of the chuck 10 in a radial direction with respect to the center of the chuck 10. The free rollers 33 support the lower end of the tube set on the chuck 10, The state becomes a role.

The chuck 10 is a chuck capable of expanding and contracting in the radial direction. When the pipe is fitted around the chuck, it is expanded and controlled outwardly to be in close contact with the inner surface of the pipe to hold the pipe. The detailed description thereof will be omitted.

An upper roller 11 and a lower roller 12, which are vertically arranged as means for substantially forming a flange of the pipe, are provided.

The upper roller 11 presses the flange forming part from the upper side and the lower roller 12 expands the flange forming part of the inner tube to an angle of 90 ° outward, And it plays a supporting role in the lower part in a pair.

Particularly, the upper roller 11 takes a vertical posture (standing posture with a horizontal axis) as in the case of the lower roller 12, and performs a forming operation on the flange forming portion using the roller surface around the upper roller 11 .

The upper roller 11 has a cylindrical shape rotated at an angle of about 90 to 100 ° with respect to the flange forming part through a horizontal section and a slope section. . ≪ / RTI >

Here, the horizontal section of the bottom surface 11a of the upper roller 11 is formed of a horizontal plane (0 °) coinciding with the horizontal line, and considering the restoring force (springback) of the flange forming portion bent at 90 degrees after the forming operation It may be configured to be inclined downward by about 1 °.

In the case of the upper roller 11, the front surface of the upper roller 11 is composed of an inclined surface 29 inclined at a predetermined angle with respect to a vertical line, so that the inclined surface 29 of the upper roller 11, It does not cause any contact interference with the outer surface of the pipe and is in contact with the line contact form through the lower end portion of the edge of the inclined surface 29, so that load factors such as frictional resistance relating to contact can be excluded.

An upper slider 13 and a lower slider 14, which are capable of linear movement while supporting the upper and lower rollers 11 and 12, respectively, are provided.

The upper slider 13 and the lower slider 14 support the upper roller 11 and the lower roller 12 and move the upper roller 11 and the lower roller 12 to a working position where the forming is performed The state becomes a role.

The upper slider 13 and the lower slider 14 are horizontally inserted into the respective slide grooves 32 provided in the slider block 17 while being arranged vertically and horizontally side by side. The upper roller 11 and the lower roller 12 can be moved to the forming operation position or returned to the initial position.

The upper cylinder 15 and the lower cylinder 16 are provided as the means for moving the upper slider 13 and the lower slider 14 back and forth in a forward and a backward direction and the upper and lower cylinders 15, 17, and is connected to the upper and lower sliders 13, 14 through the cylinder rod.

Accordingly, when the upper and lower cylinders 15 and 16 are advanced or retracted, the entire upper and lower rollers 11 and 12 including the upper and lower sliders 13 and 14 can be moved forward or backward .

On the other hand, the present invention provides a structure capable of actively coping with changes in the specifications (mainly diameter variations) of pipes.

For example, by varying the initial position of the upper and lower rollers 11 and 12 according to the size of the pipe, it is possible to process all pipes of various specifications.

The slider block 17 provided with the tension arms 21 as well as the upper and lower sliders 13 and 14 and the upper and lower cylinders 15 and 16 is supported by the LM guide 34 at the bottom thereof In addition, the screw 31 is coupled to the screw 31 rotated by the screw motor 30 in a screw transferable structure.

Accordingly, when the screw 31 is rotated by the operation of the screw motor 30, the slider block 17 can move its position while being guided by the LM guide 34. As a result, The initial positions of the tubes 11 and 12 are also varied, so that it is possible to actively cope with the specification change of the tube.

Preferably, in the present invention, a tension device 21 is further provided as a means by which the upper roller 11 and the lower roller 12, which are positioned above and below the flange forming portion in forming, are brought into complete contact with each other.

The tension device 21 serves to press the upper roller 11 toward the lower roller 12 by using a spring force so that the upper roller 11 always receives the tension force in the downward direction with the lower roller 12 do.

A roller block 20 is provided at the front end of the upper slider 13 and rotatably supported by a pin 19 at the lower end of the upper slider 13, Is installed.

The upper end of the roller block 20 is connected to the side of the tension device 21 and the roller block 20 receives the tension force provided from the side of the tension device 21, The upper roller 11 is always pressed downward by the movement of the roller block 20 (to be rotated in the counterclockwise direction around the pin in the drawing).

Since the upper roller 11 installed on the roller block 20 is always subjected to a tension force in the downward direction in which the lower roller 12 is disposed, the upper roller 11 and the lower roller 11, (12) can be more closely adhered.

A stopper pin 28 is provided on both side surfaces of the roller block 20 so that the stopper pin 28 is inserted into both the slots 27 formed in the upper slider 13.

Accordingly, the roller block 20 can be regulated in the movement range of the stopper pin 28 moving along the slot 27.

The tension device 21 includes a holder 22, a screw member 24 and a plurality of nut members 25 and a spring 26. The holder 22 and the screw member 24 are arranged in a straight line And the nut member 25 is mounted in a fastening structure at an appropriate position on the screw member 24. [

The holder 22 is connected to the upper end of the roller block 20 in a pin structure and the screw member 24 is coupled through a bracket 23 formed in the slider block 17, The spring 26 is disposed around the screw member 24 and between the front surface of the bracket 23 and the nut member 25 fastened on the screw member 24 at a position a certain distance from the bracket 23 As shown in FIG.

The pushing force of the spring 26 causes the screw member 24 including the holder 22 to be always moved forward so that the holder block 20 and the upper roller 11 So that a tensile force can be provided to the side of the frame.

At least two nut members 25 are fastened to the rear end portion of the screw member 24 and the nut member 25 at this time is brought into contact with the rear face of the bracket 23 of the slide block 17, The position of the screw member 24 in the forward direction can be restrained.

The tension of the spring 26 can be adjusted by adjusting the position of the nut member 25 provided on the screw member 24, that is, the nut member 25 supporting one end of the spring 26 .

That is, if the nut member 25 fastened to the screw member 24 is positioned in the forward or backward direction along the screw longitudinal direction, the degree of compression of the spring 26 is changed, The forming operation can be performed while appropriately adjusting the tension.

Accordingly, the operating state of the flange forming apparatus having the above structure will be described below.

7 to 9 are front views showing an operating state of a flange forming apparatus of a communication double pipe according to an embodiment of the present invention.

7 to 9, first, the upper cylinder 15 is moved backward to position the upper roller 11 backward, and the lower cylinder 16 is advanced to move the lower roller 12, So as to secure a space in which the lower end of the inner tube 100 can enter.

Next, the inner tube 100 of the double communicating tube is inserted into the chuck 10, and at the same time, the chuck 10 is expanded while being placed on the free roller 33 to fix the inner tube 100.

Next, the upper cylinder 15 is advanced to bring the upper roller 11 into contact with the outer surface of the inner tube 100.

At this time, the upper roller 11 is kept in contact with the inner tube 100 through the lower edge portion of the inclined surface 29.

Next, when the motor 18 is operated to rotate the inner tube 100 fixed to the chuck 10, the lower cylinder 15 is moved backward to move the lower roller 12 to the lower side of the upper roller 11 , And the lower end of the inner tube 100 at this time is expanded outward to form a flange portion bent by 90 degrees.

At this time, the upper roller 11 is brought into a state of completely coming into close contact with the lower roller 12 with the flange portion expanding at the same time. At this time, the upper and lower rollers 11 and 12 press the upper and lower rollers 11 and 12 while pressing the upper and lower faces of the flange portion while the spring 26 is in a compressed state, thereby achieving uniform and smooth surface treatment.

In this state, the upper and lower rollers 12 are also rotated together with the flange forming portion in a state where the lower end portion of the inner pipe 100 is bent by 90 ° between the upper roller 11 and the lower roller 12, It is possible to form a 90 ° bent flange having a uniform and smooth machined surface over the entire circumference of the inner tube 100.

During the forming process, the upper roller 11 continuously receives the force of the tension device 21 and presses the flange forming portion downward. As a result, the flange forming portion is moved up and down by the upper and lower rollers 11, 12, the flange forming portion can be formed at an angle of exactly 90 degrees.

After the forming is completed, the inner tube 100 having the flange formed therein is taken out from the chuck 10 in a state in which the upper roller 11 and the lower roller 12 are returned to their initial positions by the operation of each cylinder Which completes a one cycle process for flange forming of a communicating double pipe.

10: chuck 11: upper roller
12: Lower roller 13: Upper slider
14: lower slider 15: upper cylinder
16: Lower cylinder 17: Slider block
18: motor 19: pin
20: roller block 21: tension device
22: holder 23: bracket
24: screw member 25: nut member
26: spring 27: slot
28: stopper pin 29: inclined surface
30: screw motor 31: screw
32: Slide groove 33: Free roller
34: LM Guide

Claims (6)

A circular chuck 10 for setting the pipe and a motor 18 for rotating the chuck 10; an upper roller 11 and a lower roller 12 for flange forming; and upper and lower rollers 11, And an upper cylinder 15 and a lower cylinder 16 for operating the upper and lower sliders 13 and 14 while supporting the upper slider 13 and the lower slider 14,
The upper roller 11 is disposed in a vertical posture and the front surface thereof is composed of an inclined surface 29 that is inclined at a predetermined angle with respect to a vertical line so that the upper surface of the upper roller 11 can be in line contact with the edge surface of the inclined surface 29 The bottom surface 11a is in a horizontal plane,
The upper roller 11 is installed on a rotatable roller block 20 supported on a top slider 13 via a pin 19 and the roller block 20 is supported on a slider block 17 The upper roller 11 provided on the roller block 20 is connected to the front end of the tension device 21 so that the lower roller 12 is always subjected to a tension force in the downward direction, Respectively,
The tension device 21 includes a holder 22 connected to the roller block 20 and a screw member extending through the rear surface of the holder 22 and supported by the bracket 23 of the slider block 17 A plurality of screw members 24 including a holder 22 mounted around the screw member 24 and a plurality of nut members 25 fixed to the screw member 24 to regulate the position of the screw member 24, And a spring (26) for elastically supporting the flange forming member.
delete delete The method according to claim 1,
The spring 26 of the tension device 21 is mounted between the front surface of the bracket 23 in the slider block 17 and the nut member 25 on the screw member 24 at the front position thereof And the tension member is adjustable according to the position of the nut member (25).
The method according to claim 1,
Characterized in that the roller block (20) comprises a stopper pin (28) which regulates the position of the roller block (20) while flowing along a slot (27) formed in the upper slider (13) Forming device.
The method according to claim 1,
Wherein the slider block (17) is connected to the screw (31) side rotated by the screw motor (30) so as to be able to change the position of the screw.

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