Patent Description:
In general, as the design of a pipe becomes more and more complicated, a lot of bending inevitably occurs in connecting portions of the pipe. The reliability of an elbow pipe used in such a bent part of the pipe is also showing more and more importance in the efficiency of a pipe construction work.

However, in general, when manufacturing an elbow pipe, numerous connecting pipes need to be connected, and the parts where respective connecting pipes may be engaged are coupled by hitting using tools such as a hammer, thus leading to inevitable increase of manufacturing time and overcharge of cost of an elbow pipe, and at the same time, there is also a problem that mass production is difficult as only skilled workers have to manually manufacture it.

Thus, <CIT> disclosed a fold seam connecting part consisting of a first fold having the shape of a flange on a connecting portion of an elbow type duct consisting of a plurality of unit members, and a second fold surrounding an outer side of the dual fold.

However, although such a connecting part can secure a sealing force at an initial state, there is a problem that if the duct structure is twisted or bent by an external force applied to the duct, contact surfaces between the connecting parts may widen, thereby easily deteriorating the sealing force.

Further, in order to manufacture an elbow duct, it is necessary to repeat a process of forming a fold seam connecting part through the flange formed in each of the plurality of fragment pipes, but such a repeating process is not arranged on a straight line but refractively arranged along the shape of the elbow duct, and so it is becomes very difficult to work.

<CIT> discloses an elbow-shaped duct manufacturing device comprising an angled base and pressing rollers.

Therefore, a purpose of the present disclosure is to resolve such problems of prior art, that is to provide a device for forming seam of elbow according to claim <NUM>, that is capable of easily forming a lockseam on a connecting portion of a plurality of unit members constituting the elbow duct.

Further, another purpose of the present disclosure is to provide a device for forming seam of elbow duct, that is capable of easily forming a seam on a connecting portion of unit members having different angles of a lower supporting surface.

Further, another purpose of the present disclosure is to provide a device for forming seam of elbow duct, that is capable of forming a seam in a state in which an inner circumferential surface of a connecting portion of one pair of unit members is closely supported, thereby preventing the shape of the connecting portion from being deformed in the forming process of the seam.

The aforementioned purposes are achieved by the present disclosure, a device for forming seam of elbow duct, that molds a lockseam by bending a flange of one pair of adjacent unit members among a plurality of unit members constituting the elbow duct, including a base that supports a lower portion of the one pair of unit members; an elevating part that moves the base up and down; an angle adjustment part that adjusts a supporting angle of the base; a fixing chuck that supports an inner circumferential surface of a connecting portion of the one pair of unit members; a rotating part that rotates the fixing chuck; and a forming part that bends the flange of the one pair of unit members in a state where the flange is in contact to each other, to form the seam.

Here, it is preferable that the elevating part includes an elevating table that supports a lower portion of the base and an elevation driving part that moves the elevating table up and down.

Further, it is preferable that the elevation driving part includes a plurality of elevating shafts that are disposed to be parallel with a movement direction of the elevating table and that are fixed to a lower portion of the elevating table; a connecting shaft that is disposed in a direction intersecting the elevating shaft and that connects one pair of adjacent elevating shafts; and a driving motor for elevation that provides a rotation driving force to the connecting shaft, and a rack and a pinion are formed on a connecting portion of the connecting shaft and the elevating shaft, so that an axial direction position of the elevating shaft is adjusted by an axial rotation of the connecting shaft.

Further, it is preferable that the angle adjustment part includes a rotation axis that rotatably connects the elevating table and the base; and an interval adjustment part that connects the elevating table and one side of the base in a position distanced from the rotation axis, and that adjusts an interval between the elevating table and the base to adjust an angle of the base.

Further, it is preferable that the fixing chuck includes a chuck main body and a plurality of supporting members each of which is moveably disposed radially on the chuck main body, and on an outer circumferential surface of the supporting member, a supporting surface is formed that supports an inner circumferential surface of the connecting portion of the one pair of unit members.

Further, it is preferable that the supporting surface is made in a shape corresponding to the inner circumferential surface of the connection portion of the one pair of unit members.

Further, it is preferable that the supporting surface is assembled to be attachable/detachable on the supporting member.

Further, it is preferable that the fixing chuck further includes an elevating pin that is elevatably disposed at a center of the plurality of supporting members and that moves the supporting member in an expanding direction according to an elevation position.

Further, it is preferable that the fixing chuck further includes a spring member that is provided between the supporting member and the chuck main body and that elastically supports the supporting member in a contraction direction.

Further, it is preferable that on a plane surface of the supporting member, a guide groove is provided along a movement direction, and on an upper surface of the chuck main body, a guide projection is formed, to be inserted into the guide groove.

Further, it is preferable that the forming part includes a moving part that is disposed to be moveable in a direction approaching towards or distancing away from a center of the fixing chuck outside of the connecting portion of the one pair of unit members; a forward and backward driving part that moves the moving part forward and backward; and a forming roller that moves forward and backward together with the moving part on the moving part and that is supported to be axially rotatable.

Further, it is preferable that the forming part further includes a roller bracket that is disposed to be movable in a direction parallel with a movement direction of the moving part on the moving part in a state of supporting the forming roller; and an elastic member that is interposed between the moving part and the roller bracket and that elastically supports the roller bracket in a forward direction.

Further, it is preferable that the forming part includes a first forming part, a second forming part and a third forming part, that are disposed in plurality radially around the fixing chuck.

And it is preferable that the forming roller of the first forming part includes a first forming surface that forms a standing seam by bending an end of a first flange in a state where the first flange having '-' shape formed on a lower side edge of an upper unit member is seated on an upper side of a second flange having '<IMG>' shape formed on an upper side edge of a lower unit member.

And it is preferable that the forming roller of the second forming part includes a second forming surface that bends the seam formed by the first forming part and disposed in a horizontal direction to be inclined towards an outer surface of the duct.

And it is preferable that the forming roller of the third forming part includes a third forming surface that places the seam bent by the second forming part closely to the outer surface of the duct, to form a lock seam.

Further, it is preferable that the device for forming seam of elbow duct further includes a holder that rotatably supports the one pair of unit members.

Further, it is preferable that the holder is disposed on the moving part of the forming part, and disposed to be able to go forward and backward in a direction towards the fixing chuck on the moving part.

Further, it is preferable that a roller is disposed on a front end of the holder.

According to the present disclosure, there is an effect of providing a device for forming seam of elbow duct, that is capable of easily forming a lockseam on a connecting portion of a plurality of unit members constituting the elbow duct.

Further, there is an effect of providing a device for forming seam of elbow duct, that is capable of easily forming a seam on a connecting portion of unit members having different angles of a lower supporting surface.

Further, there is an effect of providing a device for forming seam of elbow duct, that is capable of forming a seam in a state in which an inner circumferential surface of a connecting portion of one pair of unit members is closely supported, thereby preventing the shape of the connecting portion from being deformed in the forming process of the seam.

<NUM>: DEVICE MAIN BODY, <NUM>: FIRST TABLE, <NUM>: SECOND TABLE, <NUM>: BASE, <NUM>: RING-TYPE SUPPORTER, <NUM>: ELEVATING PART, <NUM>: ELEVATING TABLE, <NUM>: ELEVATING SHAFT, 32A: RACK, <NUM>: CONNECTING SHAFT, 33A: PINION, <NUM>: DRIVING MOTOR FOR ELEVATION, <NUM>: HOUSING, <NUM>: ANGLE ADJUSTMENT PART, <NUM>: ROTATION SHAFT, <NUM>: DRIVING PART, <NUM>: FIRST STOPPER, <NUM>: ANGLE ADJUSTMENT PART, <NUM>: ROTATION SHAFT, <NUM>: DRIVING PART, <NUM>: FIRST STOPPER, <NUM>: SECOND STOPPER, <NUM>: FIXING CHUCK, <NUM>: CHUCK MAIN BODY, 51A: MOVING HOLE, 51A: GUIDE PROJECTION, <NUM>: SUPPORTING MEMBER, 52A: GUIDE GROOVE, 52B: SUPPORTING SURFACE, <NUM>: ELEVATING PIN, <NUM>: COVER, <NUM>: SPACER, <NUM>: SLIP PAD, <NUM>: SPRING MEMBER, <NUM>: ROTATING PART, <NUM>: HOLLOW TUBE, <NUM>: ROTATION DRIVING PART, 70A: FIRST FORMING PART, 70B: SECOND FORMING PART, 70C: THIRD FORMING PART, <NUM>: MOVING PART, <NUM>: FORWARD AND BACKWARD DRIVING PART, <NUM>: ROLLER BRACKET, <NUM>: FORMING ROLLER, 74A: FIRST FORMING ROLLER, 74A1: FIRST FORMING SURFACE, 74B: SECOND FORMING ROLLER, 74B1: SECOND FORMING SURFACE, 74C: THIRD FORMING ROLLER, 74C1: THIRD FORMING SURFACE, <NUM>: ELASTIC MEMBER, <NUM>: HOLDER, <NUM>: ROLLER, DA: LOWER UNIT MEMBER, DB: UPPER UNIT MEMBER, F1: FIRST FLANGE, F2: SECOND FLANGE.

Prior to the description, it should be noted that in various embodiments, components having the same configuration are typically described in the first embodiment using the same reference numerals, and in other embodiments, only the configurations that are different from the first embodiment will be described.

Hereinbelow, with reference to the attached drawings, a device for forming seam of elbow duct according to a first embodiment of the present disclosure will be described in detail.

Of the attached drawings, <FIG> is a perspective view of a device for forming seam of elbow duct of the present invention, <FIG> is an excerpt perspective view of an elevating part and an angle adjustment part of a device for forming seam of elbow duct of the present invention, <FIG> is an excerpt perspective view of a fixing chuck and a rotating part of a device for forming seam of elbow duct of the present invention, <FIG> is an exploded perspective view of a fixing chuck of a device for forming seam of elbow duct of the present invention, <FIG> is an excerpt perspective view of a forming part and a holder of a device for forming seam of elbow duct of the present invention, and <FIG> is an exploded perspective view of a forming part of a device for forming seam of elbow duct of the present invention.

The device for forming seam of elbow duct of the present invention as illustrated in the aforementioned drawings is capable of forming a first flange F1 and a second flange F2 formed on one pair of adjacent unit members Da and Db among a plurality of unit members constituting an elbow duct, in a lockseam form, to improve sealing power and coupling power, and largely includes a device main body <NUM>, a base <NUM>, an elevating part <NUM>, an angle adjustment part <NUM>, a fixing chuck <NUM>, a rotating part <NUM>, a forming part and a holder <NUM>.

The device main body <NUM> may include the elevating part <NUM> supporting a lower portion of the base <NUM>, a first table <NUM> supporting the fixing chuck <NUM> and the rotating part <NUM>, and a second table <NUM> supporting the forming part, and on a plane surface of the second table <NUM>, an opening may be formed, and the first table <NUM> may be connected with the second table <NUM> at a lower side of the opening.

The base <NUM> is for guiding an assembly position of the one par of unit members Da and Db so that a connecting portion of the one pair of unit members Da and Db can be positioned between the fixing chuck <NUM> and the forming part, and the base <NUM> may include a ring-type support <NUM> that can support a lower end of the lower unit member Da, of the one pair of unit members Da and Db. It is preferable that the ring-type support <NUM> is provided in a plurality of various sizes, and be composed to be selectively applied according to the standard of the duct that is the subject of the work.

The elevating part <NUM> is for moving the base <NUM> up and down on the first table <NUM>, and includes an elevating table <NUM> for supporting a lower portion of the base <NUM>, and an elevation driving part <NUM> for moving the elevating table <NUM> up and down.

The elevation driving part <NUM> includes a plurality of elevating shafts <NUM> that are disposed to be moveable along a movement direction of the elevating table <NUM> on the first table <NUM> and that has a top end fixed below the elevating table <NUM>, a plurality of connecting shafts <NUM> that are disposed in a direction intersecting the elevating shaft <NUM> and that connects each of the one pair of adjacent elevating shafts <NUM>, and a driving motor for elevation <NUM> that provides a rotation driving force to one of the plurality of connecting shafts <NUM>. Further, on a connecting portion of the connecting shaft <NUM> and the elevating shaft <NUM>, a rack 32a and a pinion 33a are each formed, and thus by an axial rotation of the connecting shaft <NUM>, an axial direction position of the elevating shaft <NUM> may be adjusted. Further, the elevating part <NUM> may further include a housing <NUM> that surrounds the connecting portion of the connecting shaft <NUM> and the elevating shaft <NUM> and that supports the axial position of each of the connecting shaft <NUM> and the elevating shaft <NUM>.

Accordingly, in a state elevated by the elevating part <NUM>, the base <NUM> may support the lower unit member Da, of the one pair of unit members Da and Db stacked up and down, to guide an assembly position of the one pair of unit members Da and Db, and after the lower unit member Da is supported in a rotatable state by the holder <NUM>, the base <NUM> is descended by the elevating part <NUM>. Accordingly, the base <NUM> and the lower unit member Da may be prevented from interfering with each other in a process where the lower unit member Da rotates in order to mold a lockseam. That is, it is preferable that a position the base <NUM> is descended by the elevating part <NUM> is set as a position that can sufficiently deviate from a rotation region of the lower unit member Da.

According to this embodiment, the elbow duct is composed of a plurality of unit members D1, D2, D3, D4 and D5, and the plurality of unit members D1, D2, D3, D4 and D5, may be divided into end unit members D1 and D5 positioned at both ends, and intermediate unit members D2, D3 and D4 positioned between the both ends. Here, a cut surface corresponding to a connecting portion of the plurality of unit members D1, D2, D3, D4 and D5 is designed to have an angle between them that is not perpendicular to a central axial line of each unit member, and an outer cut surface of the end unit member D1 and D5 is designed to be perpendicular to the central axial line of each unit member. That is, the angle adjustment part <NUM> is composed to be able to adjust the base <NUM> that guides the assembly position of the lower unit member Da to a first supporting angle a1 when the intermediate unit member D2, D3 and D4 is disposed as the lower unit member Da, and to adjust the base <NUM> to a second supporting angle a2 that is different from the first supporting angle when the end unit member is disposed as the lower unit member Da. (refer to <FIG>).

Such an angle adjustment part <NUM> may include a rotation axis <NUM> that rotatably connects the elevating table <NUM> and the base <NUM>, and an interval adjustment part that connects the elevating table <NUM> and one side of the base <NUM> at a position distanced from the rotation axis <NUM>, and that adjusts an interval between the base <NUM> and the elevating table <NUM> to adjust the angle of the base <NUM>.

Meanwhile, the interval adjustment part may include a driving part <NUM> that connects the base <NUM> and one side of the elevating table <NUM> and that extends and contracts so that the connection length can be adjusted; a first stopper <NUM> that is disposed at one side of the elevating table <NUM> with respect to the rotation axis <NUM> and that comes in contact with the base <NUM> when the driving part <NUM> has extended, to guide the first supporting angle of the base <NUM>; and a second stopper <NUM> that is disposed at the other side of the elevating table <NUM> with respect to the rotation axis <NUM> and that comes in contact with the base <NUM> when the driving part <NUM> has contracted, to guide the second supporting angle of the base <NUM>. Further, since the first supporting angle and the second supporting angle may be changed according to the standard of the duct, it is preferable that the first stopper <NUM> and the second stopper <NUM> are composed to be able to control the supporting angle of the base <NUM> according to the standard of the duct. For example, the first stopper <NUM> and the second stopper <NUM> may be composed to be screwed onto the elevating table <NUM> to adjust the length protruding towards the base <NUM>.

The fixing chuck <NUM> is for supporting the inner circumferential surface of the connecting portion of the one pair of unit members Da and Db, and the fixing chuck <NUM> includes a chuck main body <NUM> having a moving hole 51a in its center in a vertical direction, a plurality of supporting members <NUM> each of which is moveably disposed radially around the moving hole 51a on the chuck main body <NUM> and has, on its outer circumferential surface, a supporting surface 52b that can support the inner circumferential surface of the connecting portion of the one pair of unit members Da and Db, an elevating pin <NUM> that is disposed such that it is elevatable at a position corresponding to the moving hole 51a and that can be inserted inside the moving hole 51a to move the supporting member <NUM> to an expandable direction, a cover <NUM> that is disposed with a distance at an upper side of the chuck main body <NUM> and that covers an upper side of the plurality of supporting members <NUM>, and a spacer <NUM> that maintains the interval between the cover <NUM> and the chuck main body <NUM>.

On a plane surface of the supporting member <NUM>, a guide groove 52a is provided along the movement direction, and on an upper surface of the chuck main body <NUM>, a guide projection 51b is formed that may be inserted inside the guide groove 52a, and between the guide projection 51b and the guide groove 52a, a spring member <NUM> may be provided to elastically support the supporting member <NUM> in a contraction direction. Accordingly, when the elevating pin <NUM> ascends and the supporting member <NUM> moves in an expansion direction, the supporting surface 52b may support the inner circumferential surface of the connecting portion of the one pair of unit members Da and Db and the spring member <NUM> may be compressed at the same time, and when the elevating pin <NUM> descends, by the elastic restoring force of the spring member <NUM>, the supporting member <NUM> may move in a contraction direction, so that the supporting surface 52b is distanced from the inner circumferential surface of the connecting portion of the one pair of unit members Da and Db.

In addition, the fixed chuck <NUM> further includes a slip pad <NUM> interposed between the chuck body <NUM> and the cover <NUM> on the upper and lower surfaces of the support member <NUM>, respectively, and by such a slip pad <NUM>, the supporting member <NUM> is prevented from directly contacting the chuck main body <NUM> and the cover <NUM> and the moving friction is minimized, thereby allowing each of the numerous supporting members <NUM> to smoothly move radially according to the elevation position of the elevating pin <NUM>.

Further, it is preferable that an upper end edge of the elevating pin <NUM> is made in a slope surface, and the portion that contacts the upper end of the elevating pin <NUM> of the supporting member <NUM> is made in a slope surface having an inclination corresponding to the slope surface of the elevating pin <NUM>.

The supporting member <NUM> is formed in a fan shape, and multiple supporting members <NUM> are disposed around the moving hole 51a of the chuck main body <NUM> to form a circular disc as a whole.

Here, since a central axis of the connecting portion of the one pair of unit members Da and Db constituting the elbow duct forms a predetermined angle between them, in <NUM> o'clock direction and <NUM> o'clock direction with respect to the center of the connecting portion, the inner circumferential surface of the one pair of unit members Da and Db are parallel to each other, and in <NUM> o'clock direction, the angle between the inner circumferential surface of the one pair of unit members Da and Db consists of a right angle that is greater than <NUM> degrees, and in <NUM> o'clock direction, the angle between the inner circumferential surface of the one pair of unit members Da and Db consists of an obtuse angle that is smaller than <NUM> degrees. Therefore, the supporting surface 52b is formed in a shape corresponding to the shape of the inner circumferential surface of the connecting portion of the one pair of unit members Da and Db, and may be assembled to be attachable/detachable to/from the supporting member <NUM>. Accordingly, since it is possible to provide a supporting surface 52b that corresponds to a duct of various standards, and select a supporting surface 52b that corresponds to the desired standard duct and apply it to the supporting member <NUM>, it is possible to manufacture an elbow duct of various standards using one device.

The entire outer edge shape of the plurality of supporting members <NUM> is formed to correspond to the cross-sectional shape of the connecting portion of the one pair of unit members Da and Db, so that when the one pair of unit members Da and Db are gripped using the fixing chuck <NUM>, the cross-sectional shape of the connecting portion of the one pair of unit members Da and Db can be prevented from being deformed.

Generally, the shape of the inner circumferential surface of the connecting portion of the one pair of adjacent unit members Da and Db, of the plurality of unit members constituting the elbow duct, is composed to have, based on a central point of the connecting portion, a between angle of <NUM> degrees in <NUM> o'clock direction and <NUM> o'clock direction, and a between angle of a right angle (angle greater than <NUM> degrees) in <NUM> o'clock direction, and a between angle of an obtuse angle (angle smaller than <NUM> degrees) in <NUM> o'clock direction, and such a shape to gradually be deformed in an intermediate region.

Therefore, by forming the shape of the supporting surface 52a disposed at an outer side of the plurality of supporting members <NUM> to correspond to the shape of the inner circumferential surface of the connecting portion of the one pair of unit members Da and Db, it is possible to prevent the shape of the inner circumferential surface of the connecting portion of the one pair of unit members Da and Db from being deformed in a process of bending a first flange F1 and A second flange F2 to mold a seam.

Meanwhile, at a lower end of the elevating pin <NUM>, a driving part <NUM> may be disposed that can provide the driving force for elevation of the elevating pin <NUM>, and the driving part <NUM> may be made in a form that can be extended and contracted, such as an air cylinder.

The rotating part <NUM> is for rotating the fixing chuck <NUM>, and is provided with a hollow part that can accommodate the elevating pin <NUM> therein in a moveable state along a longitudinal direction, and includes a shaft <NUM> that may be fixed at a lower portion of the fixing chuck <NUM>, and a rotation driving part <NUM> for axially rotating the shaft <NUM>. The rotation driving part <NUM> may consist of a driving motor and a power transmission part, and the power transmission part may consist of a belt and a pulley. Meanwhile, the shaft <NUM> may be disposed on coaxially with the elevating pin <NUM>, and for this purpose, the shaft <NUM> may be made in the form of a hollow pipe capable of accommodating the elevating pin in an internal space.

The forming part is for bending and forming in the form of a lockseam in a state where the first flange F1 of the lower unit member Da and the second flange F2 of the upper unit member Db are in contact to each other. The forming part includes a moving part <NUM> disposed to be moveable in a direction towards a center of the fixing chuck <NUM> on a plane, a forward and backward driving part <NUM> for moving the moving part <NUM> forward and backward, a roller bracket <NUM> that is supported to be moveable in a direction parallel to the movement direction of the moving part <NUM> on the moving part <NUM>, a forming roller that is axially rotatably disposed at a front end of the roller bracket <NUM>, and an elastic member <NUM> that is interposed between the moving part <NUM> and the roller bracket <NUM> and that elastically supports the roller bracket <NUM> in a forward direction.

The forward and backward driving part <NUM> may include a driving motor, a ball screw that may be rotated by the driving motor, and a ball nut that may be fixed to the moving part <NUM> and that may be engaged with the ball screw, and the ball screw may be connected with the driving motor through the belt and pulley, to receive the driving force. Further, the moving part <NUM> and the roller bracket <NUM> may each be guided in a linear reciprocating motion by an LM guide and the like.

In this embodiment, the forming part is provided in plurality, and the plurality of forming parts are disposed radially around the fixing chuck <NUM>, and are composed to bend the first flange F1 of the lower unit member Da and the second flange F2 of the upper unit member Db stepwise, to mold in the form of a lockseam.

That is, according to this embodiment, the forming part may consist of a first forming part 70a having a first forming roller 74a for bending an end of a first flange F1 to form a standing seam, in a state where a second flange F2 of '-' shape is seated on an upper side of a first flange F1 of '<IMG>' shape, a second forming part 70b having a second forming roller 74b for bending the seam, that is primarily formed by the first forming roller 74a and disposed in a horizontal direction, to be inclined towards an outer surface of the duct, and a third forming part 70c having a third forming roller 74c for placing the seam that is upwardly bent by the second forming roller 74b to closely contact the outer surface of the duct, to form a lockseam.

Here, the first forming roller 74a is made to have a form in which a first forming surface 74a1 is recessed in a horizontal direction at a center of an outer circumferential surface, and in a process where the first forming roller 74a goes forward towards the fixing chuck <NUM>, an end of the first flange F1 is bent in the form of surrounding the second flange F2, thereby forming the standing seam.

Further, the second forming roller 74b is made in a recessed form such that a second forming surface 74b1 is disposed in an upper direction inclined by about <NUM> degrees at a center of an outer circumferential surface, and in a process where the second forming roller 74b goes forward towards the fixing chuck <NUM>, the standing seam may be bent in an upper direction along the second forming surface 74b1.

Further, the third forming roller 74c has a third forming surface 74c1 on an outer circumferential surface, and in a process in which the third forming roller 74c goes forward towards the fixing chuck <NUM>, the upwardly bent seam is placed in close contact to the outer surface of the upper unit member Db by the third forming surface 74c1 of the second forming roller 74b, thereby completing the lockseam.

Meanwhile, the connecting portion of the lower unit member Da and the upper unit member Db has an elliptical cross-sectional shape, and here the forming roller is elastically supported by an elastic member <NUM>, and molds the seam in a state of being in close contact along the outer circumferential surface of the connecting portion while going forward and backward within an elastic range of the elastic member <NUM>, thus it is possible to prevent distortion of the connecting portion or deterioration of the forming quality of the seam.

Meanwhile, the standing seam has a large frictional resistance during forming, and thus an eccentric load is applied to the rotating unit member, which causes the problem where the first flange F1 and the second flange F2 of the one pair of unit members Da and Db being separated from the first forming surface 74a1 of the first forming roller 74a. In this embodiment, in order to solve this problem, the first forming part 70a is provided in plurality, and are disposed in a relatively symmetrical form at both sides of the one pair of unit members Da and Db. That is, if the standing seam is formed simultaneously at both sides of the connecting portion of the one pair of unit members Da and Db, eccentric load does not occur or does not act significantly when the one pair of unit Da and Db rotate, making it possible to mold large standing seams having large frictional resistance stably.

The holder <NUM> can support the first flange F1 of the lower unit member Da on the second table <NUM> of the device main body <NUM>, and the holder <NUM> may be disposed on the moving part of the first forming part 70a, and since the holder <NUM> is disposed such that it can go forward and backward in a direction facing towards the fixing chuck <NUM> on the moving part <NUM>, the position of the holder <NUM> can be adjusted according to the standard of the duct that is the subject of work, and the state of supporting the first flange F1 can be maintained in the process of forwarding and backwarding the forming roller. Meanwhile, at a front end of the holder <NUM>, a roller <NUM> may be disposed, that freely rotates while supporting the unit member in order to minimize contact friction with the duct.

In this embodiment, it was exemplified that the holder <NUM> is provided at both sides of the plurality of first forming parts 70a, respectively, but besides this, it is possible to implement various types of modifications that can stably support the rotation of the unit member on the second table <NUM>. For example, even when manufacturing a large elbow duct, it will be preferable to compose the number of the holder <NUM> to increase or decrease according to the diameter of the duct that is the subject of work so as to stably support the rotation of the unit member.

From now on, an operation of a first embodiment of a device for forming seam of elbow duct described above will be described.

Of the attached drawings, <FIG> is a plane view of a device for forming seam of elbow duct of the present disclosure, <FIG> is a side cross-section view of a device for forming seam of elbow duct of the present disclosure, and <FIG> is a front cross-section view of a device for forming seam of elbow duct of the present disclosure.

As illustrated in <FIG>, the base <NUM> may elevate in a vertical direction on the first table <NUM> of the device main body <NUM> by the elevating part <NUM>, and by the angle adjustment part <NUM> disposed between the base <NUM> and the elevating part <NUM>, a supporting angle of the base <NUM> that supports a lower portion of the lower unit member Da may be adjusted.

The fixing chuck <NUM> penetrates through a center of the base <NUM> and is disposed in a vertical direction, and is supported in an axially rotatable state on the second table, and an upper end of the fixing chuck <NUM> selectively supports the inner circumferential surface of the connecting portion of the one pair of unit members Da and Db at an upper side of the base <NUM>, thereby fixing or releasing the fixation of the one pair of unit members Da and Db, and a lower end of the fixing chuck may be connected to the rotating part <NUM> to receive the driving force for an axial rotation.

The first forming part 70a, the second forming part 70b and the third forming part 70c constituting the forming part are radially disposed around the fixing chuck <NUM> on the second table <NUM> of the device main body <NUM>, and the first forming part 70a is provided in plurality, and are disposed at both sides of the fixing chuck <NUM> such that they are distanced from each other having the second forming part 70b and the third forming part 70c therebetween.

The holder <NUM> is disposed at both sides of the first forming part 70a provided in plurality, and when necessary, the holder <NUM> can go forward and support the one pair of unit members Da and Db in a rotatable state.

Meanwhile, in this embodiment, it is exemplified that the first flange F1 is provided in '<IMG>' shape, but when the first flange F1 and the second flange F2 of the one pair of unit members Da and Db are each provided in a state where they are extended in a horizontal direction, the forming part may be further provided with a forming part that can mold the first flange F1 of the lower unit member Da in '<IMG>' shape prior to the first forming part 70a.

Hereinbelow, a process for forming a lockseam on a connecting portion of one pair of unit members through a device for forming seam of elbow duct of the present disclosure composed as described above will be described.

Of the attached drawings, <FIG> is a view showing a state in which one pair of unit members are supplied in a device for forming seam of elbow duct of the present disclosure, <FIG> is a function view of a fixing chuck of a device for forming seam of elbow duct of the present disclosure, <FIG> is a function view of a holder and an elevating part of a device for forming seam of elbow duct of the present disclosure, <FIG> are function views showing a forming process of a lockseam by a forming part of a device for forming seam of elbow duct of the present disclosure, and <FIG> is a view showing a process of manufacturing an elbow-type duct through a device for forming seam of elbow duct of the present disclosure.

First, as illustrated in <FIG>, the lower unit member Da, of the one pair of unit members Da and Db that are subject of connection, is seated on the base <NUM>, and then, the upper unit member Db is positioned at an upper side of the lower unit member Da.

Here, the elevating position and supporting angle of the base <NUM> may each be controlled by the elevating part <NUM> and the angle adjustment part <NUM>, and accordingly, the connecting portion of the one pair of unit members Da and Db being seated on the base <NUM> may be positioned in an area between the fixing chuck <NUM> and the first forming part 70a to the third forming part 70c.

In a state where the one pair of unit members Da and Db are held on the base <NUM> as described above, the fixing chuck <NUM> comes to be positioned at an inner side of the connecting portion of the one pair of unit members Da and Db as illustrated in <FIG>, and in a state where the elevating pin <NUM> is descended as in (a) of <FIG>, the plurality of supporting members <NUM> provided between the cover <NUM> and the chuck main body <NUM> of the fixing chuck <NUM> comes to a contracted state, and thus the supporting surface 52b provided on the outer circumferential surface of the supporting member <NUM> comes to a distanced state from the inner circumferential surface of the one pair of unit members Da and Db.

Next, when the elevating pin <NUM> is ascended as in (b) of <FIG>, as the elevating pin <NUM> presses an inner end of the supporting member <NUM>, each of the plurality of supporting members <NUM> comes to move away from a center of the fixing chuck <NUM>, and in this process, the supporting surface 52b provided on the outer circumferential surface of the supporting member <NUM> may support the inner circumferential surface of the connecting portion of the one pair of unit members Da and Db.

After the one pair of unit members Da and Db are fixed by the fixing chuck <NUM> as described above, the holder <NUM> disposed at both sides of the plurality of first forming parts 70a are forwarded to support the lower portion of the flange F1 and F2 of the one pair of unit members Da and Db in a rotatable state as illustrated in <FIG>, and then the base <NUM> is descended through the elevating part <NUM>, thereby preventing the base <NUM> from being interfered when the lower unit member Da rotates.

<FIG> illustrate the stepwise forming process of a lockseam. First, as in <FIG>, when the fixing chuck <NUM> is axially rotated using the rotating part <NUM>, the one pair of unit members Da and Db supported to the fixing chuck <NUM> rotates together with the fixing chuck <NUM>. When the first forming roller 74a of the forming part is forwarded in such a state, by the first forming surface 74a1 of the first forming roller 74a, the first flange F1 and the second flange F2 of the one pair of unit members Da and Db engage each other and are coupled. That is, in a state where the second flange F2 of '-' shape is seated on an upper side of the first flange F1 of '<IMG>' shape, as an end extended in a vertical direction of the first flange F1 is bent in a horizontal direction by the first forming surface 74a1 recessed in a horizontal direction on an outer circumferential surface of the first forming roller 74a, and thus closely contacted to the upper side of the second flange F2, a form of a standing seam in which the first flange F1 surrounds the lower surface and upper surface of the second flange F2 is made. After the aforementioned primary forming is completed, the moving part <NUM> is moved backwards through the forward and backward driving part <NUM> of the forming part, thus distancing the first forming roller 74a away from the one pair of unit members Da and Db.

Next, in a state where the one pair of unit members Da and Db are rotating as in <FIG>, when the second forming roller 74b is moved forward through the forward and backward driving part <NUM> of the forming part, as the second forming surface 74b1 formed in an inclined direction on the outer circumferential surface of the second forming roller 74b presses the flange F1 and F2 having the seam form in an upper side direction, the flange F1 and F2 is disposed to be inclined in the upper side direction.

Next, in a state where the one pair of unit members Da and Db are rotating as in <FIG>, when the third forming roller 74c is moved forward through the forward and backward driving part <NUM> of the forming part, as the forming surface formed on the outer circumferential surface of the third forming roller 74c presses and closely contacts the flange F1 and F2 disposed to be inclined in the upper side direction towards the outer circumferential surface of the upper unit member Db, the flange F1 and F2 comes to make a lockseam form.

In the process of forming the flange F1 and F2 in a lockseam form using the first forming roller 74a, the second forming roller 74b and the third forming roller 74c, the inner circumferential surface of the one pair of unit members Da and Db is supported by the fixing chuck <NUM>, and thus a smooth forming of the flange F1 and F2 is possible, and the connecting portion of the one pair of unit members Da and Db can be prevented from being damaged by the forming pressure.

Meanwhile, such a process of connecting the one pair of unit members Da and Db may be repeated numerous times to complete an elbow duct. <FIG> shows a process of manufacturing an elbow duct by connecting the plurality of unit members D1, D2, D3, D4 and D5. In this embodiment, it is exemplified that the elbow duct consists of five unit members, but there is no limitation thereto.

First, as in (a) of <FIG>, after the second unit member D2 is positioned on the base <NUM>, and the first unit member D1 is positioned at an upper side of the second unit member D2, the first unit member D1 and the second unit member D2 are coupled using the forming part. Next, the second unit member D2 seated on the base <NUM> is separated, and the third unit member D3 is positioned as in (b) of <FIG>, and then the third unit member D3 and the second unit member D2 are coupled, and the third unit member D3 seated on the base <NUM> is separated, and then after the fourth unit member D4 is positioned as in (c) of <FIG>, the fourth unit member D4 and the third unit member D3 are coupled, and the fourth unit member D4 seated on the base <NUM> is separated, and after the fifth unit member D5 is positioned as in (d) of <FIG>, the fifth unit member D5 and the fourth unit member D4 are coupled, thereby completing the elbow duct composed of the plurality of unit members D1, D2, D3, D4 and D5.

Here, a surface of the plurality of unit members D1, D2, D3, D4 and D5 constituting the elbow duct, that is connected to an adjacent unit member comes to have a predetermined inclination with respect to the central axis, and an outer surface of the end unit members that are positioned at both ends of the elbow duct, that is, the outer surface of the first unit member D1 and the fifth unit member D5 are set to be perpendicular to the central axis to be connected to another duct.

That is, since the connecting portion of the one pair of unit members Da and Db is coupled to the forming part in a state where it is disposed in a horizontal direction and supported by the fixing chuck <NUM>, when the second unit member D2, the third unit member D3 and the fourth unit member D4 are disposed as the lower unit member Da as in (a), (b) and (c) of <FIG>, the base <NUM> supports the lower unit member Da ito a first supporting angle a1, and when the fifth unit member D5 is disposed as the lower unit member Da as in (d) of <FIG>, the base <NUM> supports the lower unit member Da to a second supporting angle a2.

Such supporting angles of the base <NUM> are adjusted by the angle adjustment part <NUM>. Specifically, as in (a) to (c) of <FIG>, the base <NUM> is rotatably supported around the rotation axis <NUM> on the elevating table <NUM>, and a functioning load is connected to the base <NUM>, that extends/contracts in a state where the driving part <NUM> is supported to the elevating table <NUM>. In this state, when the driving part <NUM> drives in a contraction direction, the base <NUM> rotates in one direction around the rotation axis <NUM>, and thus the inclination of the base <NUM> may be adjusted to the first supporting angle. Here, as the first stopper <NUM> provided on the elevating table <NUM> supports a lower portion at one side of the base <NUM>, the position of the base <NUM> with respect to the first supporting angle can be guided.

Meanwhile, when the driving part <NUM> drives in an extending direction as in (d) of <FIG>, the base <NUM> rotates in the other direction around the rotation axis <NUM>, and thus the inclination of the base <NUM> can be adjusted to the second supporting angle. Here, the second stopper <NUM> provided on the elevating table <NUM> supports a lower portion at the other side of the base <NUM>, and thus the position of the base <NUM> with respect to the second supporting angle can also be guided.

Claim 1:
A device for forming seam of elbow duct, that molds a lockseam by bending a flange of one pair of adjacent unit members among a plurality of unit members constituting the elbow duct, wherein thetthe device comprises:
a base (<NUM>) that supports a lower portion of the one pair of unit members (Da, Db);
a fixing chuck (<NUM>) that supports an inner circumferential surface of a connecting portion of the one pair of unit members (Da, Db);
a rotating part (<NUM>) that rotates the fixing chuck (<NUM>); and
a forming part (<NUM>) that bends the flange of the one pair of unit members (Da, Db) in a state where the flange is in contact to each other, to form the seam, characterised in by
an elevating part (<NUM>) that moves the base (<NUM>) up and down and <NUM>
an angle adjustment part (<NUM>) that adjusts a supporting angle of the base (<NUM>).