KR20100016457A - Device and method for bending pipes - Google Patents

Abstract

The invention relates to a device and method for bending pipes, said device comprising a feed device (4) for the pipe (2), which feeds the pipe (2) continuously in the longitudinal direction, a heating device (5) located in the feed direction for heating one region of the pipe (2) and a bending arm (7), which can be pivoted about a rotational axis (D) and comprises a holding device (6) for the pipe (2). The pipe (2) can be removably fixed in the holding device (6). The aim of the invention is to provide a device and a method for bending pipes with which the pipe can be bent in different bending directions. To achieve this, the feed device (4) and the bending arm (7) can moved in relation to one another in such a way that the feed device (4) and the rotational axis (D) of the bending arm (7) can be moved past one another.

Description

DEVICE AND METHOD FOR BENDING PIPES}

The invention relates to an apparatus and a method for the bending of a pipe of a pipe having a circular cross section, as described in the preamble of claim 1 or the preamble of claim 39, which apparatus comprises a pipe for continuously conveying the pipe longitudinally. Conveying device, an induction heating device arranged in the conveying direction for heating the area of the pipe, and a bending arm pivotable about the axis of rotation and having a fixing device for the pipe, the pipe being detachable from the fixing device. Can be fixed. Bending devices of this type have long been known in the art and described in various ways.

DE 21 12 019 A1 discloses by way of example an induction bending machine for the bending of pipes. In this machine, a conveying device for holding the pipe to bend exerts a longitudinal force on the pipe. A heating device for heating the pipe region in the direction of operation of the pipe is provided after the conveying device. The front end of the pipe is fixed to the bending arm non-rotationally through a fixing device. The bending arm can pivot about the axis of rotation, which is connected to the frame via pivot pins. The pipe is conveyed through a conveying device for the bending of the pipe, where the pipe is conveyed through a heating device. The heating device heats a region of the pipe and a bending moment acts on this region. By fixing the pipe to the bending arm in the fixing device, a circular force guide to the pipe fixed to the bending arm is achieved by swinging the bending arm so that the pipe is bent in the circular track. The heating device can be transported in small dimensions to allow for minor modifications through the operation of the heating device in the event of deviations in the bending radius. As an alternative or secure method of conveying the heating device, the conveying of the bending arm axis of rotation also takes place parallel to the unbent part of the pipe to be bent.

DE 25 46 695 C3 discloses an example device for bending a pipe. In this device a pipe is placed in and transported through the first end. A heating device having an induction heating coil in the longitudinal direction of the pipe is arranged after the transfer device. A cooling device is arranged after the induction heating coil. The front end of the pipe is fixed to the rotation moment generator. The rotation moment generator includes a clamping device to which the front end of the pipe is fixed. The clamping device is rotatably supported on the transverse slide and the transverse slide can be conveyed on the longitudinal slide via the rollers. The longitudinal slide is again conveyed longitudinally with respect to the direction of travel of the pipe which is not bent in the two longitudinal rails via the rollers. A bending moment is transmitted to the pipe through the clamping device for bending the pipe, and the drive for the rotation of the clamping device and the other drive for the operation of the longitudinal and transverse slides are turned on. Bending of the pipe is achieved by mutual adjustment of the drive for rotation and conveyance of the clamping device. The disadvantage with this type of bending device, however, is that only one bending direction for the pipe, for example left curve, is possible.

DE 31 51 236 A1 discloses an induction bending device for pipes. In this device one end of the pipe is tightened to the conveying device and the other end of the pipe is fixed to the bending arm at the fixing device. The pipe runs through the heating device. The fixture can be rotated about a specific axis and traversed transversely to the pipe direction at the bending arm. For bending of the pipes the conveying device is driven by the drive and conveys the pipes and the pipes are heated by means of a heating device. The bending arm performs a designated pivoting motion, in which the fastening device is capable of conveying and rotating so that various pipe bending radii are achieved. A disadvantage of this type of pipe bending machine is that the bending of the pipe is possible with various radii and various curvatures, thereby allowing for example to increase or decrease pipe bending curvature, but such bending devices are not limited to pipe bending in various bending directions. It is impossible.

It is therefore an object of the present invention to provide an apparatus and method of the type described above which is capable of continuously pipe bending in various bending directions.

This object is achieved through a pipe bending device comprising:

-A conveying device for pipes for continuously transporting the pipes longitudinally,

-The pipe is detachable from the fixing device and the conveying device and the bending arm can move relative to each other so that the conveying device and the bending arm can move relative to each other, with a fixing device for the pipe, Pivotable bending arm,

A heating device arranged in the conveying direction for heating the area of the pipe,

A fastening device which can be fixed to the bending arm in at least a first locking position and a second locking position,

The first locking position and the second locking position of the fixing device are provided on the opposite side with respect to the bending arm central axis running in the longitudinal direction.

The object of the invention is also achieved through a method for bending a pipe through an apparatus of the type described above, in which

In the first step, the pipe is bent in the first direction and then separated from the bending arm in the first locking position of the fixing device,

In the second stage, the conveying device and the bending arm move relative to each other so that the conveying device and the bending arm rotation axis can pass by each other, after which the pipe is fixed to the bending arm at the second locking position of the fixing device and A first locking position and a second locking position are provided on the opposite side with respect to the swivel arm central axis running longitudinally,

In the third step, the pipe is bent in the second direction.

In a bending device, including a conveying device and a bending arm, in which the pipe is conveyed by the conveying device and fixed to the bending arm of the fixing device, a particular area of the pipe is heated through the heating device. Forced guidance is achieved during transport of the pipe through the conveying device by fixing the pipe in the bending arm, which is guided through the pivoting motion of the bending arm about the axis of rotation in the first direction. In the region of the pipe heated by the heating device, a bending moment is thereby transmitted to the pipe. The conveying device is arranged on one side of the axis of rotation, which side is determined by the direction of swiveling motion of the bending arm. This shows the possibility of bending the pipe in the first direction. That is, bending of the pipe in the left direction is possible. The bending arm must then perform a pivoting movement in the other direction in order to be able to bend in a different direction, for example in the right direction and thereby form an almost S-shaped pipe shape. A pipe disposed at is provided on the other side of the axis of rotation. To this end, the conveying device and the bending arm can be operated relative to each other, which makes it possible to align the conveying device and the bending arm relative to each other so that the bending arm pivots in a different turning direction when the pipe is bent, and thus the same conveying direction At this point, the forced guidance for this pipe takes place in the opposite direction. Swiveling in the opposite direction of the bending arm when conveying pipes through the conveying device, in which case the axis of rotation of the conveying device and the bending arm is arranged in the opposite direction, i. The operation is achieved. This allows bending of the pipe in the second direction.

In a preferred form of this device, height adjustment is possible with respect to the conveying device or the bending arm or both sides.

The axis of rotation of the conveying device and the bending arm preferably move relative to each other in one plane, which plane is formed through straight and axis of rotation running parallel to the unbent pipe and intersecting the axis of rotation. The axis of rotation of the conveying device and the bending arm pass by each other so that the conveying device is now arranged at various sides in various directions for the bending of the pipe about this plane and thus the axis of rotation.

Preferably the bending arm comprises a swivel arm on which the fixing device is arranged. The fastening device preferably extends upwards from the swivel arm, ie in the direction of the axis of rotation, at an angle of about 90 ° at the swivel arm. The height of the fixture is determined by the diameter of the pipe to be bent, which allows the pipe to be stably fixed in the fixture. In order to be able to bend pipes of various diameters, the bending arms and the conveying device can preferably be conveyed relative to one another on the basis of height, ie in the direction of the axis of rotation. This achieves that the conveying device and the rotating shaft pass by each other simply and stably. The conveying device is provided above the stationary device with pipes arranged thereon so as to pass by each other and the height of the conveying device and / or the bending arm is adjusted so that the conveying device and the axis of rotation pass by each other.

In a preferred form, the conveying device can be moved from at least the first conveying position to the second conveying position and the first conveying position is provided on one side of the rotating shaft and the second conveying position is provided on the opposite side of the rotating shaft. As a result, the conveying device can be disposed at each conveying position on both sides of the rotary shaft, so that the pipe is forcedly guided in the first direction through the pivoting motion of the bending arm when the conveying pipe is conveyed at the first conveying position. The pivoting movement forces the guiding of the pipe in the other direction. This allows the bending of the pipe first in the left direction and then in the right direction.

Preferably the first conveyance position and the second conveyance position are provided on different sides of the plane, which are formed through straight and rotating axes that run parallel to the unbent pipe and intersect the axis of rotation of the bending arms. This means that the conveying device is moved from one side of the plane to the other side of the plane to guide the conveying device to the side of the rotation axis. It is determined through this plane how much the conveying device must be guided in order to be arranged on the other side of the axis of rotation, so that a forced guidance of the bending arm in the first pivot direction at the first conveyance position is made and another pivot at the second position. Forced guidance in the direction is made. This enables bending of the pipe in the first bending direction and the second bending direction.

Preferably the first and second conveyance positions of the conveying device are arranged at approximately equal intervals with respect to the axis of rotation of the plane or bending arm. The bending radius for the pipe is formed through the spacing of the conveying device about the axis of rotation and the arrangement of the fixing device on the bending arm, or the bending radius for the pipe is determined by the distance from the axis of rotation to the midpoint of the pipe placed in the conveying device. . However, the arrangement of the pipes is directly determined by the respective transport position of the transport device. Now, with respect to the conveying device, if both conveying positions are equally spaced with respect to the axis of rotation of the bending arm and both conveying positions are arranged on different sides of the axis of rotation, then the same bending radius for the pipe in the first and second bending directions is formed. do.

Of course, both feed positions may have different spacings with respect to the axis of rotation, in which case the pipe is bent in a first radius in the first bending direction and in a second radius in the second opposite direction.

The heating device for heating a certain area of the pipe is preferably arranged on a straight line with the axis of rotation of the bending arm at the conveying position of the conveying device, through which the bending moment acts on the pipe at each conveying position in the heated region.

Preferably, a plurality of transfer positions are provided in which the transfer device is fixed relative to the transfer device. Through a plurality of conveying positions relative to the conveying device, it is achieved that the spacing of the unbent pipes with respect to the axis of rotation of the bending arm is adjusted, which spacing determines the bending radius of the pipes. This achieves the formation of different radii for bending the pipes. Thus different bending of the pipes is possible in the bending direction as well as in the bending radius. Different bending radii can be realized in the right bending direction as well as in the left bending direction, so that any bending to the pipe is achieved.

It is of course also possible for the conveying device to be conveyed continuously so that the conveying device can be moved to the desired angular position with respect to the bending arm.

In another preferred form, the bending arm can be moved from at least the first bending position to the second bending position. The first bending position is provided on one side of the conveying device and the second bending position is provided on the other side. This means that the plane, which is formed parallel to the unbended pipe and intersects with the axis of rotation and formed through the axis of rotation, is moved and guided past the side of the conveying device. This achieves that the axes of rotation of the conveying device and the bending arm are guided past each other. In addition, the bending arm is forcibly guided in the first bending direction through the turning motion of the bending arm when the pipe is transferred, and the bending arm is forced to the second bending direction through the reverse turning motion of the bending arm in the second bending position. Aligned with respect to the conveying device in the first bending position. This allows bending of the pipe first in the left direction and then in the right direction.

It is of course possible to move not only the conveying device but also the bending arm with the rotating shaft so that the rotating shaft and the conveying device are guided alongside each other through simultaneous operation of the conveying device and the bending arm.

Preferably a plurality of bending positions are provided with respect to the bending arm, through which various bending radii and bending directions for the pipe are formed. Due to the plurality of bending positions with respect to the bending arm, the spacing of the unbent pipes with respect to the axis of rotation of the bending arms is adjustable so that various radii for bending the pipes are formed. Thus different bending of the pipes is possible in the bending direction as well as in the bending radius. Different bending radii can be realized in the right bending direction as well as in the left bending direction, so that any bending to the pipe is achieved.

The heating device is arranged on a straight line with the axis of rotation of the bending arm at each bending position of the bending arm, so that a bending moment acts on the heated region of the pipe for bending the pipe.

Preferably, a means of movement is provided and the means of movement has a variety of forms. One of them is provided with a moving means for the movement of the conveying device, the conveying device being moved from the first conveying position to the second conveying position via the conveying means. Alternatively or complementary there may be provided a means of movement for the movement of the bending arm, in which case the bending arm is moved from the first bending position to the second bending position via the movement device.

Of course the movement means may be provided for the bending arm as well as for the conveying device. Preferably the moving means comprise a sliding rail on which the conveying device and / or the bending arm are moved, whereby it is achieved that the conveying device and / or the bending arm are moved relative to each other so that the angle between the conveying device and the bending arm does not change and thus after the conveying device The pipe arranged at the back is correctly fixed to the bending arm and bent in the other direction.

Preferred continuous movement of the conveying device is achieved through means of movement, for example comprising rollers slidably arranged on the sliding rails. Corresponding locking means are provided for securing the conveying device in the desired conveying position. The movement means can of course comprise all other types of movement means, for example rollers, arranged in corresponding grooves. The means of movement preferably comprise an electric or hydraulic drive.

In another preferred form, the conveying device is movable in the transverse direction with respect to the longitudinal progression of the pipe, which allows the conveying device to be moved from each conveying position to another conveying position so that the conveying apparatus passes along the axis of rotation of the bending arm. You are guided. In addition, lateral transport of the transport device from one lock position to another lock position prevents wear of the transport device during transport. In other words, the conveying device has the same alignment direction with the bending arm ����. The bending arm and the conveying device or unbent pipe which are not pivoted in the initial position have a mutual angle of 90 °, for example. Since the conveying device is only traversed transversely from one locking position to another locking position, this right angle alignment between the unslewed bending arm and the unbent pipe is ensured at each conveying position of the conveying device. This ensures that the initial position is precisely formed at each transfer position and that the accuracy in bending the pipe is assured not only in the right direction but also in the left direction.

The bending arm has a turning range of at least 180 ° in order to enable bending of the pipe in other regions as well as in the left direction as well as in the right direction, in particular in order to enable a small and / or large bending radius for the pipe.

In the case of bending very large pipes through bending arms and conveying devices, a correspondingly large bending moment must be applied to the heated region of each pipe. Since each force produces a corresponding counter force, this counter force must be compensated for. Due to the bending moment acting on the pipe, a counter force acts on the pipe arranged in the conveying device. The direction of the counter force is determined so that the pipe in the conveying device is pressed in the opposite direction of the pivoting motion. To compensate for this force, the conveying device comprises a support member.

The bending moment exerted through the bending during bending of the pipe in two different bending directions acts differently on the heated region depending on the bending direction. However, this causes the corresponding drag force to act in different directions. Preferably, the conveying device comprises two support members, in order to achieve that the counter force formed in the pipe is compensated in the conveying device, not only in the bending in the left direction but also in the bending in the right direction. Is arranged on the opposite side of the unbent pipe.

The fixing device can be detachably fixed to the bending arm according to the invention. The fixing device for the pipe is lockable in at least the first and second locking positions in the bending arm, the bending arm being arranged opposite the longitudinal axis of the swivel arm central axis.

In another embodiment of the present invention, the first and second locking positions are arranged mirror symmetrically about the central axis M of the bending arm 7.

During bending of the pipe, the heating device is arranged on a straight line including the axis of rotation of the bending arm, so that the bending moment acts on the heated region of the pipe during the transport of the pipe and during the pivoting movement of the bending arm. For this purpose, a heating device is arranged on the bending arm between the conveying device for the pipe and the fixing device. In order to enable bending of the pipe in the first pivotal direction of the bending arm, a locking position for the fixing device is arranged on the rear side of the bending arm, ie on the corresponding side of a straight line perpendicular to the unbent pipe, Is arranged in front of the fixing device on this straight line with the axis of rotation. The bending arm pivots in the other direction when bending the pipe in the other direction. In order to achieve that the heating device is arranged not only on the straight line with the axis of rotation but also on the bending arm in front of the fixing device with respect to the conveying device, the fixing device is fixed in the first locking position and the second locking position is on the other side of the straight line. It has a rotation axis. The locking position for the fixing device in the bending arm is provided on the opposite side about the central axis of the bending arm and the heating device and the bending arm rotational axis are preferably provided in the central axis of the bending arm. This ensures that the heating device is on a straight line with the axis of rotation, not only in the first locking position but also in the second locking position, so that the bending moment acts on the heated area of the pipe, not only at the left bend of the pipe, but also at the right bend. Bending is possible.

Preferably the bending arm comprises a guide in which the locking device is transferred from the first locking position to the second locking position. This facilitates the transport of the fastening device from the first locking position to the second locking position, aligns the fastening device with respect to the bending arm in all the locking positions for the bending of the pipe, and the pipe is in both locking positions in the fastening device. It is guaranteed to be fixed at. Preferably the guide for the fixing device comprises a roller or sliding member or the like.

In the form of either bending arm, the first locking position and the second locking position are formed mirror symmetrically about the central axis M of the swivel arm 37.

In order to ensure that the fixing device is stably fixed at the bending arm, the fixing device is preferably fixed to the bending arm via a pin. Another advantage of the use of the pin is that the lock can simply be detached again by detaching the pin to switch to a different locking position. The fastening device may of course also be fastened to the bending arm via all other detachable fastening means such as bolts or the like.

In another preferred form, the fixing device is removable from the bending arm, in which case the fixing device is removed from the bending arm, for example via a crane or the like. This offers the advantage that the conveying device and the axis of rotation can pass alongside each other in a simple way, because the fixing device extending upward from the bending arm is no longer placed in the path between the conveying device and the bending arm. Since the swivel arms of the pipe and the bending arm arranged in the conveying device are arranged in different planes, they can be guided to each other without adjusting the height of the conveying device or the bending arm.

Preferably the heating device comprises an induction heating ring surrounding the pipe, whereby it is also ensured that only a small area of the pipe is heated, which corresponds to the area of the pipe on which the bending moment for bending acts. Preferably, a cooling unit is arranged at the rear of the heating device so that the pipe is cooled again quickly in order to prevent the bending moment acting on the heated area and to prevent the bending of the already bent pipe area unintentionally after the pipe is bent.

When the conveying device and the bending arm are guided to each other to change the bending direction, the heating device, the conveying device and the heating device so that the heating device is in a straight line with the axis of rotation at the second conveying position of the conveying device or at the second bending position of the bending arm. The bending arm is placed back. Preferably, when the heating device is placed in the conveying device, it is not necessary to align the heating device with respect to the conveying device and only the bending arm and the conveying device are relatively aligned so that the heating device lies on a straight line with the axis of rotation, so that the arrangement of parts is easy. Done.

In addition, the arrangement of the heating device in the conveying device provides the advantage that the pipe does not have to be removed from the heating device when switching in the bending direction. The pipe is simply separated from the holding device at the bending arm so that there is no more connection between the conveying device and the bending arm so that the bending arm can be moved to the second bending position or the conveying device can be moved to the second conveying position. . Of course, the heating device may be provided separately.

Preferably the conveying device, the bending arm and the heating device are connected with the control device. By means of the control device, the operation of the conveying device, the bending arm and the heating device can be coordinated with each other or mutually controlled so that a specified bending pattern for pipe bending is achieved through the control device.

Preferably a sensor unit is provided for monitoring the bending process. For this purpose, the sensor unit includes a plurality of sensors. This provides sensors for monitoring the heating temperature of the heating device for the pipe. In addition, a distance sensor or length sensor for monitoring the bending moment acting on the pipe or a sensor for monitoring the wall thickness of the pipe is provided. These sensors are connected to the regulating unit and the heating device via a control device so that the heating device and the pipes are mutually aligned based on the data measured by the sensor. This ensures that the pipe is bent to the desired shape. It is also ensured that the wall thickness of the pipe is constant before and after bending or the transition is constant at the transition of the straight region of the pipe to the curved area and preferably the stress is suppressed at the pipe wall. For this purpose the heating device is preferably transportable in a two-dimensional space and the transport is perpendicular to the longitudinal direction of the pipe. In addition, the pipes are transferred to the two-dimensional space through the control unit, ensuring optimum alignment of the pipes and heating devices during the entire bending process.

In the method according to the invention for pipe bending, the pipe arranged in the conveying device in the first step is bent in the first bending direction through the conveying of the pipe and through the forced guidance due to the turning motion of the bending arm. In the second step, the conveying device and the rotating shaft are guided past each other. In the third stage, the pipe is bent again through conveyance and through forced guidance due to the pivoting motion of the bending arm, which results in an inverted arrangement of the conveying device and the rotational axis with respect to the pivoting direction of the bending arm. The reversed arrangement results in a pivoting movement in the opposite direction with respect to the bending arm so that a forced guide in the opposite direction with respect to the pipe is carried out via the conveying device during conveyance. This allows bending of the pipe in the right direction as well as in the left direction.

In a preferred form of this method, the conveying device for fixing the pipe is fixed at the first conveying position when the pipe is bent in the first bending direction during the first step. The fixing device for fixing the pipe in the bending arm is locked in the first locking position. The heating device is arranged between the stationary device and the conveying device, in which case the heating device lies on a straight line with the axis of rotation of the bending arm. For this purpose the axis of rotation is preferably arranged on the central axis of the bending arm. Preferably the first locking position for the fixing device is provided on the conveying device counterpart of the bending arm so that the fixing device is fixed on the conveying device counterpart of the bending arm central axis while the heating device is at the same time the bending arm between the conveying device and the fixing device. It is arranged on the central axis of the.

At the end of the first bending process in the first bending direction the pipe is disconnected from the fixing device and removed from the bending arm, for example via a conveying device. For this purpose the conveying device is for example operated upwards and thus the pipe is removed upwards. Of course, the bending arm can also move down to remove the fixing device from the pipe. It is also possible for the conveying device to operate in the longitudinal direction of the pipe in order to remove and remove the pipe from the fixing device via a corresponding pull action. At the same time, if the heating device is provided to be movable along the pipe, the heating device is removed above the pipe along the pipe. However, it is preferred that the heating device is arranged next to the conveying device so that the pipe remains intact in the heating device, thereby preventing the heating device from being individually transported along the pipe.

The fixing device is then separated from the bending arm. This can be done for example via the guide described above. It is also preferred that the fixing device is removed at the first locking position, for example via a crane, in which case the conveying device is moved to the second conveying position without height adjustment. The conveying device can be guided past the axis of rotation on the swivel arm of the bending arm with the pipe disposed thereon and moved to the second conveying position.

When the conveying device is guided past the axis of rotation, the fixing device is moved from the bending arm to the second locking position, the bending arm is aligned corresponding to the conveying device and the pipe, and preferably the bending arm is turned 180 °. After that, the pipe is fixed in the fixing device.

It is preferred that the fixing device be capable of pipe fixing on both sides and use of the same fixing device in both bending directions. It is of course also possible to use different fastening devices for each direction, which simplifies the shape of the fastening means for the fastening devices in the pipe and swivel arms.

Since the conveying device is now at the second conveying position with respect to the axis of rotation of the bending arm, the conveying of the pipe through the conveying device enables pipe bending in the second direction.

In an alternative or complementary method, the bending arm can be moved from at least the first bending position to the second bending position. The difference from the above-described method is that instead of the conveying device, a plane formed through a straight line with a bending arm or a rotational axis is guided past the side of the conveying device and thus the rotating axes of the conveying device and the bending arm are guided past each other.

Other preferred forms of the invention are described in the dependent claims and the description below.

In the following the invention is described in detail on the basis of the accompanying drawings for the embodiments.

1 shows a front view of a preferred embodiment of the device according to the invention for the bending of a pipe.

2 shows the pipe bending device according to FIG. 1 in a first transport position.

3 shows the pipe bending device according to FIG. 1 in an intermediate position.

4 shows the device according to FIG. 1 in a second transport position.

5 shows an enlarged cross-sectional view of the mobile device.

1 to 5 show a preferred embodiment of the device 1 according to the invention for the bending of the pipe 2.

The device 1 for bending the pipe 2 comprises a conveying device 4 arranged on a flat plate 3, which is arranged in the conveying device 4. The pipe 2 can be conveyed in the longitudinal direction via the conveying device 4. The pipe 2 extends protruding from the conveying device 4 through one end and proceeds through the heating device 5 which heats the pipe 2 in a small area. In the longitudinal direction of the pipe 2, at the rear end of the heating device 5, the pipe 2 is fixed in the fixing device 6 at the bending arm 7 via one end and the bending arm 7 is a flat fixing plate 3. Is rotatably arranged around the rotation axis (D).

The conveying device 4 for the pipe 2 comprises a housing 8 arranged on a stationary plate 3, the housing 8 having a U-shaped cross section. The base 9 of the U-shaped housing is arranged parallel to the flat stationary plate 3 and the parallel both legs 10a and 10b extend vertically from the base 9 and thus travel from the stationary plate 3 in the vertical top direction. do.

A pipe 2 is arranged between both legs 10a, 10b of the housing 8 and the pipe 2 is fixed to the feed slide 11. The feed slide 11 for the pipe 2 is arranged to be movable in the guide 12, the guide 12 being provided with guide means 13 and housing 8 base 9 provided on both legs 10a and 10b. Through other guide means 14 disposed inwardly to the U-shaped surface.

Guide means 13 on both legs 10a, 10b of the housing 8 are formed through elongated recesses 19 formed in the legs 10a, 10b, which recesses are longitudinal to the housing 8. Proceed to The feed slide 11 is arranged with four projections 20 which are slidably guided in the recesses 19. The feed slide 11 is provided with two opposing projections 20 at the front and the rear, respectively, so that the feed slide 11 is stably guided in the recess 19 and the edge wear of the pipe 2 is prevented.

In the guide means 14 in the base 9 of the housing 8 there is arranged a feed slide 11 and thus a conveying means 15 for conveying the pipe 2. The conveying means 15 includes a cylinder 16 arranged on the feed slide 11, and the piston rod 17 is arranged in the cylinder 16 so as to be movable. The piston rod 17 is fixed to the bracket 18 provided between the housing 8 counterpart of the bending arm 7 and both legs 10a, 10b. Hydraulic fluid is supplied to the cylinder 16 to feed the feed slide 11 together with the pipe 2 and the piston rod 17 is pressed out of the cylinder 16. Hydraulic fluid is provided by the accumulator. This generates a linear force and moves the feed rod 11 together with the pipe 2 in the direction of the heating device 5 and the bending arm 7 since the piston rod 17 and the cylinder operate apart from each other.

The feed slide 11 can also be conveyed by other types of conveying means. For example, it is possible for the feed slide 11 to be conveyed through the chain drive, in which case the corresponding slide driven through the drive is fixed to the feed slide 11. The feed slide can also comprise all types of sliding means or rolling means, for example sliding members or rollers. In addition, the guide 11 for the feed slide 11 may be formed directly through the base 9 and both legs (10a, 10b).

The legs 10a and 10b of the housing 8 are provided as reinforcing members 21. The reinforcing member 21 accommodates the counter force generated thereby upon bending of the pipe 2.

On the outer side wall 9a of the base 9 of the housing 8 facing the direction of the fixed plate 3, a moving means 22 for moving the transfer device 4 is arranged on the fixed plate 3. The fixed plate 3 is arranged with two parallel sliding rails 23 and the two sliding rails 23 are provided perpendicular to the longitudinal progression of the housing 8 or the pipe 2 so that the conveying device 4 is In the fixed plate 3 is moved on the sliding rail 23 in the transverse direction.

Four moving means 22 are arranged in the housing 8, two moving means 22 each at the front end opposite the bending arm 7 and two at the rear of the housing 8 corresponding to the bending arms. Is provided at the end. Each of the two means of movement 22 is arranged at the base 9 below one of the legs 10a, 10b, so under the leg 10a two means of movement 22 are respectively forward in the housing 8. And at the rear and below the second leg 10b, two moving means 22 are also provided at the front and rear at the housing 8, respectively. This ensures the movement of the conveying device 4 in the stationary plate 3 so that the conveying device 4 does not change its alignment with respect to the bending arm 7 and the heating device 5.

The four moving means 22 are formed in the same structure and will be described below in detail with reference to one moving means 22. The moving means 22 comprises two rollers 24 arranged back and forth, and the rollers are arranged on the suspension device 25 in a rotatable state. The roller 24 comprises two spaced wheels 26, between which sliding rails 23 are arranged. The suspension device 25 is fixed to the housing 8 via a fixing member 27. The fixing member 27 has a substantially L shape. The fixing member 27 extends upwardly from the outer wall of the leg 10a through the first L-shaped leg and travels along the outer wall of the base 9 through the second L-shaped leg. The fixing member 27 is welded to the housing 8. The fastening member 27 may also be fastened to the housing 9 in any other fastening manner, for example by gluing, bolting, riveting or otherwise.

Both rollers 24 arranged back and forth are connected to the electric drive 29 through the clutch unit 28, and the clutch unit provides a reduction ratio suitable for the purpose. In order to move the conveying device 4 from the first conveying position to the second conveying position, the roller 24 is driven through the electric drive 29, and the conveying device (between the roller 24 and the sliding rail 23) The roller 24 does not slide on the sliding rail 22 as a corresponding friction occurs due to its own weight. The rotation axis D of the conveying device 4 and the bending arm 7 is guided through each other by movement through the moving means 22 and bending of the pipe 2 in two bending directions is achieved.

It is possible for the sliding rails 22 and / or the rollers 24 to have friction pads, which almost prevents the sliding of the rollers 24 on the sliding rails. The friction pad is for example formed through a Teflon coating.

The moving means 22 also comprise locking means 30 which can lock the conveying device 3 in the first conveying position and the second conveying position. The locking means 30 each comprise two clamping members 31 extending from one side of the sliding rail 23. In order to lock the conveying device 4, the two clamping members 31 are fastened by a force motor such that the sliding rail 23 is tightened between the two clamping members 31 and the conveying device 4 is fixed at the desired conveying position. It works. Since the two clamping members 31 move away from each other for the release of the conveying device 4, the sliding rail 23 is no longer tightened and the roller 24 is able to slide on the sliding rail 23.

All other types of locking means may also be provided for the conveying device 4. Thus, it is also possible to use one electromagnet in place of both clamping members, in which case one electromagnet is arranged on each side of the sliding rail. Electricity is supplied to the electromagnet to lock the conveying device 4 and the conveying device 4 can be fixed to the sliding rail 23 due to the magnetic force. For this purpose, the sliding rail is formed of a metal or magnetic material.

The feed slide 11 is provided with a sensor unit 32 on the side facing the direction of the heating device 5. The sensor unit 32 comprises a first sensor 33 for checking the wall thickness of the pipe 2 and a second sensor 34 for monitoring the bending moment acting on the pipe 2. Since both sensors 33 and 34 are connected to a control device, the wall thickness and the bending moment can be monitored during the bending process and can be adjusted when a deviation occurs. The control device is also connected to an adjustment unit 35 which encloses the pipe 2. The adjusting unit 35 can align the pipe 2 in a two-dimensional space through a small operation. The alignment operation of the adjustment unit 35 is linked to the alignment operation of the heating device 5 so that the pipe 2 and the heating device 5 are optimally aligned with each other during the entire bending process and the pipe 2 is in the desired shape. The heating device 5 is also connected to the regulation unit 35 so as to be bent.

Of course, all types of sensors for monitoring the bending process can be used, for example temperature sensors or distance sensors and length sensors for monitoring the heating temperature of the pipe 2.

The bending arm 7 rotatably arranged on the stationary plate 3 comprises a swivel arm 37 arranged on the rotary socket 36. The rotary socket 36 is disposed on the fixed plate 3 so as to be rotatable about the rotation shaft D. As shown in FIG. For this purpose a circular opening 38 is formed in the stationary plate 3, through which the rotary socket 36 extends. The rotary socket 36 is rotatably formed beside or below the opening 38, for example through a ball bearing or the like. The axis of rotation D forms a pivot axis for the bending arm 7.

The swivel arm 37 has a double T-shaped cross section, and the slide rail 40 formed on the upper T-shaped surface of the upper body extends along the longitudinal progression of the swivel arm 37. It is provided on the central axis M of the swivel arm 37. The central axis M of the swivel arm 37 and the rotation axis D for the bending arm 7 intersect at one point.

A slide 41 is provided on the long sliding rail 40 so that the slide 41 is movable, and the slide 41 has a substantially rectangular shape. The slide 41 has a groove 42 formed long on the bottom surface of the rectangular shape, and slides to surround the sliding rail 40 formed with the slide 41 on the side so that the sliding rail 41 can be stably moved. 40 is arrange | positioned to the sliding rail 41 through this groove | channel. The side wall 43 of the slide 41 extends laterally downward from the swivel arm 37, and a protrusion is formed at the lower end of the side wall 43, and the protrusion is a double T-shaped swivel arm 37. The groove 44 of the double T-shaped swivel arm 37 forms a guide for the slide 41.

The slide 41 is provided to be movable in the longitudinal direction of the swivel arm 37 in the swivel arm 37, the movement being implemented for example via a corresponding hydraulic system. Such hydraulics include hydraulic cylinders and piston rods. Of course, all other types of conveying devices may be used for the slide 41. Due to the mobility of the slide 41 in the swivel arm 37 it is possible to apply various radii to the bending of the pipe 2, in particular with the pipe 2 fixing device 6 on which the slide 41 is arranged; Bending out of the circle to the pipe 2 when it is moved together during bending is possible through it.

A fixing device 6 is detachably arranged on the slide 41, and the slide 41 has a first locking position and a second locking position for the failure device 6. In both locking positions the locking device is locked in the slide 41 via a pin, for example. The pin is removed when the fixing device 6 is released from the slide 41.

Both locking positions for the fastening device 6 are provided in various aspects of the angular axis M of the swivel arms 37 of the bending arm 7. Both locking positions for the pipe 2 fixing device 6 are provided for two different bending directions of the pipe 2. The locking position for the fixing device 6 is based on the central axis M of the bending arm 7 so that the heating device 5 is arranged between the fixing device 6 and the conveying device 4. Are provided on the corresponding surfaces of The heating device 5 is arranged on the central axis M of the swivel arm 37 such that the heating device 5 is linearly aligned with the rotational axis D of the bending arm 7.

Bending in the second direction as well as in the first locking position for bending in the first direction, through the arrangement of the pipe 2 fixing device 6 in the locking position opposite each other about the central axis M It is also possible for the heating device 6 for the pipe 2 to be disposed on a straight line with the rotation axis D, even in the second locking position.

The heating device 5 comprises an inductor ring which wraps around the pipe 2. Since the heating device 5 can operate on the basis of the pipe 2, the area heated by the heating device 5 can change during the bending process so that the heated area can be changed by the sensor 33 of the sensor unit 32. 34) can be adjusted accordingly based on the measured data. The heating device 5 can be moved in the longitudinal direction of the pipe 2 and the angle between the inductor ring and the pipe 2 can be varied so that the heat distribution in the pipe 2 is adjusted accordingly. Preferably a cooling unit is assigned to the heating device 5 which cools the heated region of the pipe 2 again after bending.

The method according to the invention for bending the pipe 2 in two different directions operates as follows. In order to bend the pipe 2 in the first bending direction, for example to the left, a pipe 2 is arranged in the conveying device 3, the conveying device 4 being provided in the first conveying position. The first conveying position of the conveying device 4 is based on a plane E, which is formed through a straight line G and a rotating axis D, which run parallel to the unbent pipe 2 and intersect the axis of rotation. It exists in cotton.

The pipe 2 extends through the heating device 5 and is fixed to the bending arm 7 in the fixing device 6. The fixing device 6 is arranged on the swivel arm 37 of the bending arm 7 in the first locking position and the locking position is the corresponding side of the conveying device 4 with respect to the central axis M of the bending arm 7. Is provided. The heating device 5 is arranged on the central axis M of the bending arm 7 so that the heating device 5 forms a straight line with the rotation axis D of the bending arm.

The conveying device 4 is then operated for the bending of the pipe 2, which is conveyed in the direction of the bending arm 7 via the feed slide 11. Since the pipe 2 is fixed to the bending arm 4 in the fixing device 5, the forced guidance is caused by the turning motion of the bending arm 7 around the rotation axis D. As shown in FIG. This allows the bending moment 7 to pivot in the first direction about the axis of rotation D during the transfer of the pipe 2 and the bending moment is heated so that the pipe 2 bends in the first direction through this transfer. Through the heated zone.

The pipe 2 is conveyed through the conveying device 4 until the desired bending of the pipe 2 is achieved. For example, the pipe 2 is conveyed such that the bending arm 4 is rotated in the first turning direction by 90 ° about the rotation axis D and the pipe 2 is bent in the first direction in a four minute arc. If the bending process is completed in the first direction, the conveying device is turned off and the pipe 2 is no longer conveyed.

Thereafter, the pipe 2 is separated from the bending arm 7 in the fixing device 6. For this purpose the fixing device is for example completely separated from the swivel arm 37 and moved over and separated from the pipe 2 via a crane. The pipe 2 and the fixing device 6 can of course be separated from one another in various ways. The fixing device can thus be provided to be open to or above that side so that the pipe 2 can be removed from the fixing device, for example via the height or side adjustment of the bending arm 7 or the conveying device 4. have.

Preferably, however, the fastening device 6 has a swivel arm such that the heating device 5 can be removed to be guided over the pipe 2 in the same way even after the fastening device 6 has been guided over and separated from the pipe 2. It is separated from 37.

The conveying device 4 is then separated at the first conveying position by means of the locking means 30 and is moved from the first conveying position to the second conveying position along the sliding rail 23 via the conveying means 12, which In the process the conveying device 4 is guided next to the axis of rotation D of the bending arm 7. Since the fixing device 6 is removed from the bending arm 7 and the heating device 5 is also removed from the pipe 2, the pipe 2 which is still present in the conveying device 4 when the conveying device 4 moves, It is always guided through the swivel arm 37 of the bending arm 7. The heating device 5 can of course also be kept in a state arranged in the pipe 2 and / or the conveying device 4.

The conveying device 4 is locked via the locking means 30 in the second conveying position and the second conveying position is provided on the other side of the plane E. The bending arm 7 is now continuously rotated in the first bending direction such that the bending arm 7 is aligned vertically with respect to the portion of the pipe 2 that is not yet bent.

The heating device 5 is then guided over the pipe 2 and positioned on the central axis M of the bending arm 7 so that the heating device 5 is provided on a straight line of the rotation axis D. The heating device 5 is not disposed on the bending arm 7 and does not rotate when the bending arm is pivoted and remains aligned during the bending process with respect to the conveying device so that the pipe 2 is able to lift the inductor ring of the heating device 5. Is guided through.

The fastening device 6 is again guided over the pipe 2 and fixed to the bending arm 7 in the second locking position of the slide 41, the second locking position for the fastening device 6 now being fixed 6 ) Is provided on the other side of the bending arm central axis M such that it is again provided on the opposite side of the conveying device 4 of the bending arm 7 central axis M. The fixing device 6 is fixed to the slide 41 via pins.

The conveying device 4 is operated to bend the pipe 2 in the second direction and the feed slide 11 conveys the pipe 2 in the direction of the bending arm 7 and the pipe 2 is heated by the heating device 5. Is guided through and heated in the measurement area.

Since the pipe 2 is fixed to the bending arm 7 in the fixing device 6, the forced guidance is made through the turning motion of the bending arm 7 about the rotation axis D, and the now turning motion that is performed by force is , Due to the different arrangement of the bending arm 7 and the conveying device 4, ie because the conveying device 4 is arranged on the other side of the plane E about the axis of rotation D of the bending arm 7. , It will face in the opposite direction. This causes the bending arm 7 to pivot in the second direction opposite the first direction about the axis of rotation D in the transfer of the pipe 2 and through this transfer of the pipe 2 to the bending of the pipe 2. The bending moment acts on the region heated through the heating device 5 so as to be in this second direction.

The pipe 2 is now conveyed back through the conveying device 4 until the desired bending of the pipe 2 is achieved. For example, the pipe 2 is such that the bending arm 4 is rotated in the second turning direction, for example by 90 ° about the rotation axis D and the pipe 2 is bent in the second direction in a four minute arc. Transferred.

If the bending process is completed in the second direction, the conveying device 4 is turned off and the pipe 2 is no longer conveyed. The pipe 2 has one quarter arc in the first direction and one quarter arc in the second direction after both bending processes.

It is of course possible through the method described above that all the desired combinations of left and right bending to the pipe 2 are achieved. In the above, the present invention has been described in detail through an embodiment in which the conveying device is moved from the first conveying position to the second conveying position via a moving means. Of course, the bending arm can be moved from the first bending position to the second bending position and a means of movement is assigned to the bending arm such that the rotational axis D of the bending arm 7 and the conveying device 4 are guided past each other. An apparatus may be provided.

The invention can be used in an apparatus and method for pipe bending.

Claims (50)

A device for pipe bending, A conveying device 4 for the pipe 2 for continuously conveying the pipe 2 in the longitudinal direction, The conveying device 4 and the bending arm so that the pipe 2 is detachably fixable in the fastening device 6 and the conveying device 4 and the bending arm 7 rotation axis D can be guided past each other. A bending arm 7, which 7 can move relative to each other, is provided with a fixing device 6 for the pipe 2 and pivotable about the axis of rotation D, A heating device 5 arranged in the conveying direction for heating the area of the pipe 2 In the apparatus comprising: A fixing arm 6 is lockable to the bending arm 6 in at least a first locking position and a second locking position, the bending arm in which the first locking position and the second locking position of the fixing device 6 run in the longitudinal direction. (6) A device characterized in that it is provided on the opposite side with respect to the central axis (M). Device according to claim 1, characterized in that the conveying device (4) is provided to enable height adjustment. Apparatus according to claim 1 or 2, characterized in that the bending arm (7) is provided for height adjustment. 4. The device according to claim 1, wherein the conveying device is movable from at least a first conveying position to a second conveying position. 5. Device according to one of the preceding claims, characterized in that a moving means (22) is provided for the transport device (4). The method according to claim 5, wherein the first conveying position and the second conveying position are provided on different sides of the plane E, the plane E running parallel to the unbent pipe 2 and the axis of rotation D And a straight line (G) intersecting with and a rotation axis (D) of the bending arm (7). The method according to any one of claims 4 to 6, characterized in that the first conveyance position and the second conveyance position of the conveying device (4) are equally spaced with respect to the axis of rotation (D) of the bending arm (7). Device. 8. The heating device 5 according to claim 4, characterized in that the heating device 5 is arranged on a straight line together with the axis of rotation D of the bending arm 7 at the transport position of the transport device 4. Device. Device according to one of the claims 4 to 8, characterized in that a plurality of transport positions are provided for the transport device (4). 10. The device as claimed in claim 1, wherein the bending arm is movable from at least the first bending position to the second bending position. 11. Device according to one of the preceding claims, characterized in that a means of movement is provided for the bending arm (7). 12. The device according to claim 11, characterized in that the heating device (5) is arranged on a straight line with the axis of rotation (D) of the bending arm (7) at the bending position of the bending arm (7). 13. Device according to one of the claims 10 to 12, characterized in that a plurality of bending positions are provided with respect to the bending arm (7). Apparatus according to any one of the preceding claims, characterized in that the conveying device (4) is movable transversely with respect to the longitudinal progression of the pipe (2). The device according to one of the preceding claims, characterized in that the conveying device (4) is movable in the longitudinal direction of the pipe (2). The reduction gear according to any one of the preceding claims, characterized in that the bending arm (7) has a swing range of at least 180 °. The device according to claim 1, wherein the conveying device comprises at least one support member. 18. Device according to claim 17, characterized in that the conveying device (2) comprises two support members (21), both supporting members (21) being provided on opposite sides of the pipe (2). Device according to one of the preceding claims, characterized in that the fixing device (6) is detachably fixable at the bending arm (7). 20. The device according to claim 1, wherein the first locking position and the second locking position are provided mirror symmetrically about the central axis (M) of the bending arm (7). The device according to one of the preceding claims, characterized in that the fastening device (6) is removable from the bending arm (7). 22. The guide according to any one of the preceding claims, wherein the fixing device (6) is arranged to be movable in the bending arm (7) and the bending arm (7) is a guide (40) for the fixing device (6). 44). 23. The device according to one of the preceding claims, characterized in that the axis of rotation (D) of the bending arm (7) is arranged on the central axis (M) of the bending arm (7). The device according to claim 1, wherein the heating device comprises at least one induction heating ring surrounding the pipe. The device according to one of the preceding claims, characterized in that the heating device (5) is arranged next to the conveying device (4). The device according to any one of the preceding claims, characterized in that the heating device (5) is movable along the pipe (2). 27. Apparatus according to any one of the preceding claims, characterized in that a cooling unit is assigned to the heating device (5). 28. The device according to claim 1, wherein the conveying device, the bending arm and the heating device are connected with a control device. Device according to claim 28, characterized in that a temperature sensor connected with a control device is assigned to the heating device (5). 30. Device according to claim 28 or 29, characterized in that a sensor (33) for checking the wall thickness of the pipe (2) is connected with the control device. Device according to one of the claims 28 to 30, characterized in that a sensor (34) for the bending of the pipe (2) and / or the monitoring of the rotational moment is connected with the control device. A bending arm for a device for pipe bending, A swivel arm 37 pivotable about an axis of rotation D, and At least one fixing device 6 arranged on the arm and for fixing the pipe 2 at the bending arm 7. A bending arm comprising: The swivel in which the locking device 6 is lockable to the swivel arm 37 in at least a first locking position and a second locking position, the swivel in which the first locking position and the second locking position of the locking device 6 run in the longitudinal direction. Arm 37 A bending arm, characterized in that provided on the opposite side with respect to the central axis (M). 33. The bending arm according to claim 32, wherein the first locking position and the second locking position are provided mirror symmetrically about the central axis (M) of the swivel arm (37). 34. Bending arm according to claim 32 or 33, characterized in that the axis of rotation (D) of the bending arm (7) is arranged on the central axis (M) of the swivel arm (37). 35. A bending arm according to any one of claims 32 to 34, characterized in that the fixing device (6) extends upward from the swivel arm (37) at an angle of 90 degrees. 36. Bending arm according to one of the claims 32 to 35, characterized in that the fixing device (6) is fixable via a pin at the swivel arm (7). 37. Bending arm according to any one of claims 32 to 36, characterized in that at least one fastening device (6) is movable in the longitudinal direction of the swivel arm (37) in the slide (41). 38. A bending arm according to claim 37, characterized in that at least one fastening device (6) is movable transversely with respect to the longitudinal direction of the swivel arm (37) in the slide (41). As a method for pipe bending, A conveying device 4 for the pipe 2 for conveying the pipe 2 in the longitudinal direction, A heating device 5 for heating the area of the pipe 2, and The pipe (2) comprises a bending arm (7) detachably fixable at the fixing device (6) and pivotally arranged about the axis of rotation (D) together with the fixing device (6) for the pipe (2), In the first step, the pipe 2 is bent in the first direction and then separated from the bending arm 7 in the first locking position of the fastening device 6, In the second stage, the conveying device 4 and the bending arm 7 move relative to each other and then the pipe 2 so that the conveying device 4 and the bending arm 7 axis of rotation D are guided alongside each other. ) Is fixed to the bending arm 7 in the second locking position of the fixing device 6 and the central axis of the swivel arm 37 in which the first locking position and the second locking position of the fixing device 6 runs in the longitudinal direction ( On the opposite side, based on M), In the third step, the pipe (2) is bent in the second direction. 40. A moving device (22) is provided for the transport device (4), said moving device (22) being characterized by guiding the transport device (4) sideways at the axis of rotation (D) of the bending arm (7). How to be gong. 41. The device according to claim 40, wherein the conveying device (4) is moved from the first conveying position to the second conveying position by means of a moving means (22). 42. A method according to claim 41, characterized in that a plurality of transport positions are provided for the transport device (4). The method according to claim 41 or 42, characterized in that at the conveying position of the conveying device (4) the axis of rotation (D) of the heating device (5) and the bending arm (7) are arranged on one straight line. 44. A moving means according to any one of claims 39 to 43, wherein a moving means for the bending arm (7) is provided, the moving means such that the axis of rotation (D) of the bending arm (7) is guided past the conveying device (4). Moving the bending arm (7). 45. A method according to claim 44, wherein the bending arm (7) is moved by means of movement from at least the first bending position to the second bending position. Method according to claim 45, characterized in that at the bending position of the bending arm (7) the heating device (5) and the axis of rotation (D) of the bending arm (7) are arranged on one straight line. 47. A method according to claim 45 or 46, characterized in that a plurality of bending positions are provided for the bending arm (7). 48. A method according to any one of claims 39 to 47, characterized in that the fixing device (6) is moved from the first locking position to the second locking position on the bending arm (7). 49. The method according to any one of claims 39 to 48, wherein the pipe (2) is removed from the fixing device (6) and attached to the fixing device (6) via a conveying device (4). 50. The method according to any one of claims 39 to 49, wherein said heating device (5) is moved along a pipe (2).

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