EP1932603A1 - Pipe bending machine for manufacturing meandering pipes and method for manufacturing meandering pipes - Google Patents

Abstract

The pipe-bending machine has a separate drive train (A, B) for each pipe bending segment (12A, 12B). In the neutral position, the axis of the turning shaft (14A) of the first drive train is co-axial with the bending radius (RB) of the second bending segment (12B), and the turning shaft (14B) of the second drive train is co-axial with the bending radius (RA) of the first pipe bending segment.

Description

TECHNICAL AREA

The invention relates to a pipe bending machine for meandering pipe courses, as used for example in the field of solar thermal energy as sun-irradiated, by a fluid to be heated by flowing Rohrmeander. Other applications include underfloor heating, cooling ceilings or heat exchange registers. Such tube bending machines usually have two to the tube caliber, i. the Rohrau ßendurchmesser substantially adapted pipe bending segments, which are free to pivot relative to each other while leaving a bending die and specify the bending profile to be produced.

TECHNOLOGICAL BACKGROUND

On the market, a generic pipe bending machine is known as in FIG. 7 is shown as prior art. In this known pipe bending machine is driven by a toothed belt, not shown, long-toothed pivot pin used as the drive means 14 ', in which a pneumatically adjustable locking pin 15 'is mounted coaxially displaceable. One with the drive means 14 'rotatably connected pivot shaft 14 A' is designed as a rectangular block and also penetrated by the locking pin 15 '. The pivot shaft 14A 'together with a guide housing 17', a bed, which a lateral, ie transversely oriented to the pivot shaft displacement (double arrow D) 'of the pivot shaft 14A' together with the drive means 14 'with the aid of a guide slot 17C' allows. By the attachment, the rotational drive force (double arrow E ') on the guide housing 17'. transferred, so that the entire guide housing 17 'is pivoted about the respective pivot axis about the respective drive axis. The pivot shaft 14A 'can be locked to a base plate 17A' of the guide housing 17 'by the locking bolt 15' in one or the other sliding position, so that during the bending process no displacement between the guide housing 17 'and the pivot shaft 14A' can take place. Coaxial with the guide bores 17B 'of the base plate 17A' are circular tube bending segments 12A 'and 12B' and their associated retaining pins 16A 'and 16B', respectively, and held relatively loosely in position relative to the guide housing 17 ', this position being maintained by the tapered free end of the guide Arresting pin 15 'is improved in the respective locking position. The tube to be bent is guided by the bending die 12 'between the circumferential half-grooves of the tube bending segments 12A'. Accordingly, in the bending process, the pipe bending segment which is not in the locked position, ie eccentrically to the drive 14 ', pivots about the pipe bending segment coaxially oriented with the drive device 14' and mechanically connected in a straight line.

In order to produce a pipe bend with opposite direction of rotation to produce a meandering Rohrmeander, the above lock is released and the entire drive 14 'with its pivot shaft 14A' transversely with respect to the guide housing 17 'and locked again in the second, now coaxial with the other Rohrbiegesegment working position , - This known pipe bending machine is correspondingly expensive to handle and because of the necessary sliding game not too precise and less robust as would be desirable.

PRESENTATION OF THE INVENTION

The invention has for its object to improve the bending behavior in a relatively simple construction of a generic pipe bending machine. In particular, it is desirable to achieve greater dimensional accuracy and less susceptibility of the tube bending machine. This object is achieved by a tube bending machine having the features of claim 1 or 2 and by a method having the features of claim 10. Accordingly, it is provided in terms of the tube bending machine in the core that the pivot axes of the drive means each Rohrbiegesegmentes are arranged in the zero position coaxial with the bending radius of the other Rohrbiegesegmehtes and the coaxiality is left during each bending cut. In this way, it is possible that the tube bending machine endlessly supplied, in itself straight tube feed strand is bendable once in a right bend and once in a left turn around the desired angle. This angle is usually 180 °, so that the highest possible pipe density per clamped pipe surface is achieved. Accordingly, the driven pivot axes of the two tube bending segments rotate in opposite directions during tube bending, wherein the one tube bending segment is in each case in its stationary to the drive shaft of the pivoting tube bending segment in a stationary, coaxial idle state. After each bending step, the previously pivoted tube bending segment is pivoted back to its zero position, the tube register preferably not displaced. In this way, after this pivoting back a predeterminable length of the tube through the bending die are pushed straight through until the straight part of the register length is fed along with an arc length. Only then does a new pipe bending step begin in the opposite direction to the first bending direction of the second bending direction. During each bending step, the straight feed piece of the not yet bent tube is held in position. This has the consequence that the beginning of the pipe register to be bent or the entire already bent pipe register is pivoted about the bending angle on its sub. The latter is in use and can be facilitated by a swivel table.

In order to easily connect each tube bending segment with its associated rotary actuator, a coaxial with him holding pin is provided on the drive side for each tube bending segment. In order to improve the dimensional accuracy of the pipe register to be bent, the pipe holding pins of both pipe bending segments are connected by a respective pivotally connected to the pipe holding pin spacer element.

If the first drive device has a rigid first pivot arm between its pivot shaft and the retaining pin of the first pipe bending element, an optimum pivoting force transmission is thereby achieved.

If the second drive device has a rigid second pivot arm between its pivot shaft and the retaining pin of the second pipe bending element, which is rigidly connected to the pivot shaft of the second drive device, in particular by means of a clogging element, this results in a low-loss pivoting force transmission.

If the second pivot arm has a recess for pivoting in and out of the first holding pin of the first pipe bending element, then a very small, extremely stable pipe bending head can be realized thereby.

A further Maßhaltigkeitsverbesserung the pipe bending is achieved in that the pivot shafts of both pipe bending elements are pivotally mounted in a shaft holding body. This may include a distance variability of the two drive shafts

The same applies if the first pivot arm has a recess for pivoting in and out of the Verkopfungselementes the second drive means.

To simplify the tool change, the, z. B. when wearing the pipe bending elements or when changing to other pipe diameter or bending radii to be bent is required to simplify, consisting of two coupling points separation point between the pivot shafts, preferably the shaft holding body and the Schwenkkarmen provided.

A pipe straight holder allows a targeted feeding of the pipe feed strand to the bending die.

A distance adjuster for the pivot shafts allows a centering of the bending die on the exit point of the pipe straight holder and thus a Rohrbiegequalität improving adjustment.

With regard to a method for producing meandering pipe runs, the object with the features of claim 10 is achieved. Accordingly, it is provided to pivot the two pipe bending segments starting from a pipe feed aligned to the zero position alternately to the other pipe bending segment under bending of the pipe and after pivoting back (in Leerweg) of the initially bent under bending pipe bending segment the pipe on the pipe feed for the Next advance bending step sufficiently far and then to pivot the other pipe bending segment to the one pipe bending segment with simultaneous pipe bending back and then zurückzuschwenken back in the free path and to repeat this process for the production of further Rohrmeander.

The above-mentioned and the claimed components to be used according to the invention described in the exemplary embodiments are not subject to special conditions of size, shape, material selection and technical design, so that the selection criteria known in the field of application can be used without restriction.

Further details, features and advantages of the subject matter of the invention will become apparent from the dependent claims, as well as from the following description of the accompanying drawings and table, in which - by way of example - an embodiment of a pipe bending machine is shown.

Fig. 1

eine Rohrbiegemaschine in Ansicht von unten in Null-Stellung vor dem Biegen;

Fig. 2

dieselbe Rohrbiegemaschine in einer Biegestellung nach Vollenden einer Rechtsbiegung;

Fig. 3

dieselbe Rohrbiegemaschine in einer zweiten Biegestellung nach Vollenden einer Linksbiegung;

Fig. 4

dieselbe Rohrbiegemaschine in perspektivischer Ansicht von unten;

Fig. 5

dieselbe Rohrbiegemaschine in Seitenansicht;

Fig. 6

eine Prinzipdarstellung der Rohrbiegemaschine sowie

Fig. 7

eine Rohrbiegemaschine nach dem Stand der Technik.

In the drawing show

Fig. 1

a pipe bending machine in bottom view in zero position before bending;

Fig. 2

the same tube bending machine in a bending position after completion of a right bend;

Fig. 3

the same tube bending machine in a second bending position after completion of a left bend;

Fig. 4

the same pipe bending machine in a perspective view from below;

Fig. 5

the same pipe bending machine in side view;

Fig. 6

a schematic diagram of the pipe bending machine as well

Fig. 7

a pipe bending machine according to the prior art.

All the essential elements of the tube bending machine are based on the schematic diagram of the FIG. 6 out. Thereafter, there is a possibly two-engine actuated drive means 14 of two drive trains (strand A and strand B). A first pivot shaft 14A, which is rotatable via the drive in an angle range between usually 0 ° and approximately 270 ° in both directions of rotation, is rotatably mounted in a shaft holding body 26 - as well as the drive train B, the pivot shaft 14B. Spacers 26A, 26B allow the lateral spacing of the parallel aligned ones To change the pivot shafts 14A / 14B, be it for adjustment or for bending radius adjustment.

On the opposite side of the shaft holding body 26 of the drive device 14, each drive train at a coupling point 24A and 24B is separable, so that the entire underlying bending head of the pipe bending machine can be replaced with another. This is required if the tube bending radii are to change.

The pivot shaft 14A is closed, e.g. As shown approximately at right angles to a pivot arm 20A, the rotatable with the pivot shaft 14A, if necessary, separable as an interface, connected and a recess 25A ', to release movement space for the yet to be explained Verkröpfungselement 22. At the free end of the pivot arm 20A is connected approximately at right angles and rotatably connected to the pivot arm 20A, a retaining pin 16A, which penetrates a spacer 18 in rotatable form and carries at its free end a first tube bending segment 12A. Likewise, the retaining pin 16A may be rotatably attached to the free end of the pivot arm 20A and the retaining pin 16A rotatably or rotatably support the first tube bending segment 12A at its free end. The first (and also the second) tube bending segment 12A, 12B consist in the illustrated embodiment of a circular disc, each with a radially outer circumferential groove whose cross section corresponds in a known manner to be bent tube half diameter approximately.

Similarly, the second drive train B is constructed, wherein the crank shaft 14B first an offset 22 connects and leave the recess 20B 'of the subsequent pivot arm 20B space for the movement of the holding pin 16A of the drive train A.

The pivot shaft 14A of the drive train A and the retaining pin 16B of the drive train B are in the in Fig. 1 shown zero position of the pipe bending machine coaxial arranged. The same applies to the pivot shaft 14B of the drive train B and the holding pin 16A of the drive train A.

The operation is the following:

If an initially straight pipe section pushed forward by the bending die 12 sufficiently far to be bent to a left-hand arc seen from above, the drive train B becomes active, wherein the drive device 14 rotates the pivot shaft 14B by, for example, 180 °. In this case, the Verkröpfungselement 22 moves into the recess 20A 'and the retaining pin 16B pivots the spacer member 18 together with the Rohrbiegesegmentes 12B in the counterclockwise direction by 180 ° around the Rohrbiegesegment 12A around and thus generates a 180 ° bend of the tube. Subsequently, the strand B pivots back by the same angle until the tube bending segment 12B has returned to its illustrated zero position when viewed from above. Thereafter, the tube to be bent can be further advanced through the bending die 12. This usually happens without rotation about the tube axis, but in principle can also be done with rotation about the tube axis. After the fed still straight tube is sufficiently advanced, a further bending operation, in particular a left bend can be performed. For this purpose, the drive device 14 pivots the pivot shaft 14A by a predetermined angle of, for example, 180 ° in the clockwise direction seen from above. As a result, the retaining pin 16A pivots the spacer element 18 together with the tube bending segment 12B around the second tube bending segment 12B. The thus again bending pipe end accomplishes this pivoting. Following this second bending step, the drive train A travels in the free travel again by the bending angle in its zero position shown in the drawing. This completes a complete double bend cycle to produce a meander. This can be followed by further bending cycles in any way.

The FIGS. 1 to 5 illustrate the in FIG. 6 illustrated device in a practical embodiment.

FIG. 1 illustrates the state of the pipe bending machine before the start of manufacturing a pipe mandrel 10 (see FIG. Fig. 3 ), wherein the bendable, in the direction of arrow C by a Rohrgeradehalter 28 displaceable tube is advanced as required by the bending die 12.

Out FIG. 2 It can be seen how the tube bending segment 12B, starting from the in FIG. 1 shown zero position, in a bent by 180 ° bending position (in the drawing in the clockwise direction) is pivoted about the remaining in position other tube bending segment 12A and thus bent the tube to be bent around the tube bending segment 12A according to the predetermined bending contour by 180 ° ,

After the in FIG. 2 shown bending process in a clockwise direction, the tube bending segment 12B first in Lehrweg in the FIG. 1 corresponding zero position pivoted back. In this zero position, the tube to be bent can be further advanced by the Rohgeradehalter 28, wherein the 180 ° degree bow already produced is moved with. Then, a bending step in the counterclockwise direction, which in the in FIG. 3 shown pivot position of the pipe bending segment 12A has already been completed. From this working position, the tube bending segment 12A will follow the teaching path again corresponding to double arrow G in the zero position accordingly FIG. 1 swiveled back. This is a complete meander made and more meander can connect in the same way.

Out FIG. 4 It is particularly clear how the two drive units 14 of the drive train A and B with respect to the shaft holding body 26 centered by Abstandversteller 26 A, 26 B with respect to the pipe straight holder 28 and can be adjusted in terms of spacing to produce larger or smaller Rohrbieger segments with other Rohrbiegesegmenten.

Out Figures 5 and 6 shows, inter alia, how a tool change can take place at the coupling points 24A, 24B. Here, the pivot arms 20A, 20B of the pivot shafts 14A, 14B of the two drive trains A and B are separated.

While in the drawings of circular tube bending segments is assumed, the bending shape and tube bending radius are arranged in the zero position coaxial with the pivot shaft of the other drive train, the invention basically also allows to realize Rohriegesegmente with other bending shapes and other arrangement of the axis of Rohrbiegradius, when the two drive trains A, B are realized according to the features of claim 2.

LIST OF REFERENCE NUMBERS

10

Rohrmeander

10A

bending profile

10B

bending profile

12

bending die

12 '

Biegmatrize

12A

Pipe bending segment

12A '

Pipe bending segment

12B

Pipe bending segment

12B '

Pipe bending segment

14

driving means

14 '

driving means

14A

pivot shaft

14A '

pivot shaft

14B

pivot shaft

15 '

locking pin

16A

retaining pins

16A '

retaining pins

16B

retaining pins

16B '

retaining pins

17 '

guide housing

17A '

baseplate

17B '

guide bores

17C '

guide link

18

Spacer element

20A

swivel arm

20A '

recess

20B

swivel arm

20B '

recess

22

Verkröpfungselemerit

24A

coupling site

24B

coupling site

26

Shaft holding body

26A

distance adjuster

26B

distance adjuster

28

Pipe Corset

A

powertrain

B

powertrain

C

arrow

D '

Double arrow (shift)

e '

Double arrow (rotation)

F

Double arrow (swiveling)

G

Double arrow (swiveling)

RA

Bending radius.

RB

bending radius

Claims (10)

Pipe bending machine for meandering pipe runs (10) having at least two tube bending segments (12A, 12B) which are substantially adapted to the tube caliber and allow a bending die (12) to be pivoted relative to one another, which predetermines the bending profile (10A, 10B) and a drive device (14). for separate pivoting of both tube bending segments,
characterized,
in that each tube bending segment (12A, 12B) is provided with a separate drive train (A) and (B),
that in a zero position, the axis of the pivot shaft (14A) of the first drive train (A) coaxial with the bending radius (RB) of the second bending segment (12B) and the pivot shaft (14B) of the second drive train (B) coaxial with the bending radius (RA) of first pipe bending segment (12A) are arranged and
that the coaxiality of the zero position at each pivoting of one of the pivot shafts (14A, 14B) is canceled in a bending position of the respective pivoted Rohrbiegesegmentes. Pipe bending machine according to the preamble of claim 1, in particular claim 1, characterized
that each tube bending segment (12A, 12B) is provided with a separate drive train (A) and (B), and
that the first drive train (A) between its pivot shaft (14A) and a retaining pin (16A) of the first pipe bending element (12A) has a first Swing arm (20A) and the second drive train (B) between its pivot shaft (14B) and a retaining pin (16B) of the second Rohrbiegesegmentes (12B) via a crank member (22) with the second pivot shaft (14B) of the second drive train (B) second pivot arm (20B). Pipe bending machine according to claim 2, characterized in that the second pivot arm (20B) has a recess (20B ') for pivoting in and out of the first retaining pin (16A) of the first drive train (A) Pipe bending machine according to claim 2 or 3, characterized in that the first pivot arm (20A) has a recess (20A ') for pivoting in and out of the Verkröpfungselementes (22) of the second drive means. Pipe bending machine according to one of claims 1 to 4, characterized in that each drive train (A; B) has a coupling point (24A; 24B) for tool change. Pipe bending machine according to one of claims 1 to 8, characterized by a shaft holding body (26) for spaced holding the pivot shafts (14A, 14B) of the drive means (14). Pipe bending machine according to one of claims 1 to 6, characterized by a spacer element (18) connecting the retaining pins (16A; 16B) of the two pipe bending segments (12A; 12B). Pipe bending machine according to one of claims 1 to 9, characterized by a pipe straight holder (28) for feeding a still unbent pipe string into the bending die (12) of the tube bending segments (12A, 12B) in their zero position. Pipe bending machine according to one of claims 1 to 10, characterized by a distance adjuster (26A); 26B) for the drive shafts (14A; 148). DB = EPODOC & ... PN = EP0284301 A method of producing circumferential pipe runs with at least two tube bending segments (12A, 12B) which are substantially adapted to the tube caliber and which are capable of pivoting reactively with respect to one another, leaving the bending profile (10A, 10B) free, and with a drive device (14) for the separate pivoting of the tube bending segments, both tube bending segments,
characterized in that
each Rohrbiegesegment is selectively pivoted by a separate drive train, wherein a present in a zero position coaxiality between the pivot shafts of the drive trains is repealed with the bending radius of the pipe bending segment of the other drive train for each pivoted Rohrbiegesegment in the bending positions, and wherein the one or the other pipe bending segment, starting from the aligned to a pipe feeding zero position, mutually pivoted by the associated drive train to the other pipe bending segment bending the pipe and after pivoting back (in the free path) of the initially bent under bending a Rohrbiegesegments the pipe over the pipe feeding point for the next bending step advanced far enough and subsequently the other pipe bending segment is pivoted by its associated drive trains to a pipe bending segment with simultaneous tube bending and is then swung back again (in Leerweg) and these steps for making further pipe mandrels are repeated if necessary.

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