EP0108193B2 - Pipe-bending machine - Google Patents

Description

The invention relates to a pipe bending machine with an elongated machine frame according to the preamble of claim 1, which is based on a company document "invitation 4th EMO Hannover 15-24 IX 1981" from Cantu (CO), Italy. A machine that is referred to in this document as "Type B4X" is referred to below as a standard machine.

Pipe bending machines with the features described above are known for the call bending of pipes. A bending mandrel present in the interior of the pipe to be bent can also be arranged.

Bending machines of the above-described training are extremely suitable for bending pipes with a larger diameter. Pipes of larger diameter are often bent with larger or larger bending radii. As a result, the freedom of bending that a pipe bending machine should have is not essential. This is also the reason, because with numerically controlled pipe bending machines the question of the freedom of bending, so that parts of the pipe that are bent when the pipe is bent, do not hit components of the bending machine, are checked and entered into the program. Pipes with a smaller diameter are usually bent with smaller bending radii. This means that during bending there is a risk that bent pipe parts will strike components of the pipe bending machine. Therefore, the question of freedom from bending is of great importance. EP-A1-0 029 694 describes how great freedom of bending can be created on a pipe bending machine. However, the invention is not based on this, but rather on a standard machine of the type mentioned above. In the known pipe bending machine, a beam-shaped support is arranged on the machine frame which carries the bending table at one end, the center of rotation of the bending table being in the longitudinal center of the beam. Although the support offers ground clearance so that the already bent area of the tube can also get under the bending table, the side clearance and the back clearance are limited by the beam-shaped support and also by the feed carriage which can be moved along the support.

The invention has for its object to provide a pipe bending machine of the type mentioned, which gives great freedom in terms of space and also in its structural design with regard to the tube configuration after bending.

This object is achieved with the features of claim 1.

^T) hrough the inventive solution, which can also be expressed in such a manner that the bending table is mounted on an outwardly beyond the vertical side wall above cultivation, there is provided a comparatively exposed bending assembly, which gives an improved flexural freedom.

To further increase the freedom from bending, it is proposed that the center of rotation of the bending table lies outside the frame wall of the carrier. With this solution, it is possible that parts of the bent tube can also reach below the bending table and the beam-like, cantilevered beam supporting the bending table, so that there is a very large amount of freedom from bending.

In order to be able to produce the beam with only a small overall height and also a small width with a great length, these factors are also determinative for the desired great freedom of bending, it is proposed in a further embodiment that the drive of the bending template is transverse to the longitudinal extension of the machine frame or of the one carrying the bending template Support beam is on the side of the feed carriage or the slide rail.

While in previous pipe bending machines the drive is present in the machine frame and in the longitudinal extension of the machine frame, as is apparent, for example, from DE-B-2 133359, it is proposed according to claim 3 to drive the bending template transverse to the longitudinal extension of the machine frame or the bending template load-bearing support beam and on the side that carries the feed carriage or the slide rail. This makes it possible to arrange the drive of the bending template in the immediate vicinity of the bending table.

Another proposal is that the drive of the bending template and the drive of the slide rail are available in one structural unit. The term "structural unit" should not be understood in such a way that it is a building. Rather, it should be expressed that the drive of the bending table and the drive of the slide rail are present in a spatially close arrangement to one another and are fastened to common supports or a common support or are connected to one another.

In a further embodiment it is proposed that the structural unit have a further drive for the movement of the slide rail in the longitudinal direction of the carrier or tangential to the bending template.

In a further embodiment it is proposed that the structural unit is screwed onto the support beam.

In a further embodiment it is proposed that the drive of the bending template and the drive of the slide rail for their movement in the radial direction of the bending template run parallel to one another. In order to arrive at drives in the sense of the assignment cer drives of the bending table and the slide rail, which take up only a small space, it is proposed in a further embodiment that the drive of the bending template consists of a hydraulic motor, on the outgoing shaft of which a worm shaft is fastened with a worm wheel is this drives the bending table via a worm gear set surrounding the bending table.

As part of the space-saving and effective measure, it is further proposed that the drive of the slide rail in the radial direction of the bending template consists of a hydraulic piston-cylinder arrangement which is arranged above and laterally offset from the hydraulic motor drive of the bending table.

Furthermore, the drive of the slide rail in the longitudinal direction of the machine frame consists of a hydraulic piston-cylinder arrangement, which is arranged above the hydraulic motor and extending transversely thereto.

To fulfill the task of obtaining the greatest possible freedom from bending, it is further proposed that the bending table be rotationally symmetrical. As a result, it occupies only a small space.

In a further embodiment, the bending table is arranged in a housing which carries the drive worm and which is screwed onto the side wall of the supporting caliber. This measure not only ensures that the axis of rotation of the bending table is arranged laterally in front of the support beam, but also simple manufacture and assembly is achieved.

In a further embodiment it is proposed that the bending table is provided at half height with a rotating worm wheel and consists of an outer casing and an inner sleeve, the worm wheel being arranged on the sleeve in the space between the casing and the sleeve.

As part of the task of creating the greatest possible freedom from bending, measures are also provided according to the present invention to simplify the components or to arrange them in the most spatially advantageous manner.

While in previous tube bending machines the bending table carrying the bending template is provided with a swivel arm which carries the clamping jaw, which is moved radially back and forth to the bending template and its drive, it has been proposed in connection with the stipulation of forming the bending table as a body with rotational system metrology to dispense with the clamping jaw moving in the radial plane of the bending template and to fasten the tube to the bending template in a new way. In order to achieve this, it is proposed in a further embodiment that the sleeve of the bending table is designed in its interior as a cylinder in which a piston which can be acted on from both sides is arranged so as to be axially movable, the piston being provided with a piston rod which projects upward from the cylinder. Furthermore, the bending template is divided in the middle of its circumferential groove in a horizontal plane into a lower bending template part and an upper bending template part, the lower bending template part being connected to the sleeve and the upper bending template part being connected to the piston rod which can be moved out of the sleeve. This measure eliminates the need for a swivel bar, which would also impair the freedom from bending, because the tube is clamped to the bending template in the axial direction of the bending template. The axially acting clamping is particularly advantageously achieved by the proviso that the upper part of the bending template has a collar which projects beyond this circumference and which has a semicircular groove serving as a clamping jaw. This collar particularly advantageously has an extension projecting downward beyond the lower half of the bending template.

To further increase the freedom from bending, it is proposed that the bending table in its upper region above the level of the beam supporting it be tapered strongly and preferably the lower bending template part also has an adapted cone.

To attach the bending template to the sheet table, it is proposed in a further embodiment that a conical ring is present on the bending table, which overlaps the conical lower region of the lower bending template part and the upper conical region of the bending table and is held on it by fastening elements.

The invention is exemplified in the drawing.

• Figur 1 in perspektivischer Darstellung eine Rohrbiegemaschine bekannter und allgemein gebräuchlicher Ausbildung,
• Figur 2 in perspektivischer und prizipieller Darstellung eine Rohrbiegemaschine nach der vorliegenden Erfindung,
• Figur 3 die Rohrbiegemaschine nach Figur 2, in der Ansicht von oben,
• Figur 4 in größerer Darstellung die Anordnung und den Antrieb des Biegetisches und der Gleitschiene in der Ansicht von oben;
• Figur 5 einen vertikalen Schnitt durch die Darstellung nach Figur 4 entsprechend der dortigen Linie V-V,
• Figur 6 einen vertikalen Schnitt durch die Darstellung nach Figur 4 entsprechend der dortigen Linie VI-VI,
• Figur 7 einen vertikalen Schnitt durch den Biegetisch entsprechend Figur 4 nach der dortigen Linie VII-VII,
• Figur 8 einen vertikalen Schnitt durch die geschlossene Biegeschablone;
• Figur 9 einen vertikalen Schnitt durch die offene Biegeschablone,
• Figur 10 die Beigeschablone nach Figur 8 in der Ansicht von oben,
• Figur 11 den Träger der Biegeschablone und der Gleitschiene für den Vorschubwagen im Schnitt und in perspektivischer Darstellung,
• Figur 12 die Befestigung der baulichen Einheit von Biegeschablone und Gleitschiene an dem Träger.

Show it:

• FIG. 1 shows a perspective view of a tube bending machine of known and generally used design,
• FIG. 2 shows a perspective and basic illustration of a pipe bending machine according to the present invention,
• FIG. 3 the pipe bending machine according to FIG. 2, in a view from above,
• Figure 4 shows the arrangement and the drive of the bending table and the slide rail in a larger view in the view from above;
• FIG. 5 shows a vertical section through the illustration according to FIG. 4 along the line VV there,
• 6 shows a vertical section through the representation according to FIG. 4 along the line VI-VI there,
• 7 shows a vertical section through the bending table corresponding to FIG. 4 along the line VII-VII there,
• 8 shows a vertical section through the closed bending template;
• FIG. 9 shows a vertical section through the open bending template,
• FIG. 10 shows the beige template according to FIG. 8 in a view from above,
• 11 the carrier of the bending template and the slide rail for the feed carriage in section and in perspective,
• Figure 12 shows the attachment of the structural unit of the bending template and slide rail to the carrier.

FIG. 1 shows a pipe bending machine with the feed carriage 10, which can be moved back and forth on one or more guide rails 11 on the upper side of the machine frame 12. The Feed carriage 10 has a tubular cylinder 13 with an adapter sleeve 14, in which the tube 15 to be bent is clamped. The tube 15 is guided around a pivotally mounted bending template 16, which has a recess 17 corresponding to the tube radius. The tube is pressed against the bending template via a clamping jaw 18, the clamping jaw being actuated on a clamping device 19 via a hydraulic cylinder 20. These components are arranged on the swivel arm 21 of the bending table, while the template 16 is arranged axially to the axis of rotation. The rotation takes place in the direction of arrow 22. A slide rail is designated by 23.

Within the tube 15 in the area of the bending template 17 and the slide rail 23 there is a mandrel which is fastened to the front end of the mandrel rod 24. The mandrel rod 24 is held on a mandrel retractor 25 which is attached to the bearing 26. The machine frame 27 has a protruding stem 28. With 29 the chain case of a template reverse rotation is designated, which also affects the freedom from bending. The bending table 21 is driven by a chain accommodated in the stem 28, which is actuated by two piston-cylinder arrangements 30 and 31 in the machine frame.

Figure 2 shows the Rohrbeigermaschine of the inventive design. Although these have the same basic elements as the machine according to FIG. 1, such as feed carriage, clamping sleeve, bending table, bending template, slide rail and clamping jaw, other reference symbols should be selected in the following description for the components of FIGS. 2 to 12.

The machine frame 31 carries a supporting beam 33 which projects far on both sides 32, 32a and has a running rail 34 for the feed carriage 35, which carries the clamping sleeve 36. The clamping sleeve is actuated by a hydraulic motor 37 which is arranged above the clamping sleeve.

So that different diameters of the bending template can be taken into account, there is a rail 38 for the displacement of the clamping sleeve on the feed carriage 35 and a rail 40 on the upper part of the supporting beam on the rearwardly projecting beam part 39, so that the mandrel rod 41 carrying the mandrel retraction 42 is also transverse is movable to the longitudinal extent of the support beam 33.

The bending table 43, which, as will be described in detail later, is of a rotationally symmetrical design and is therefore not provided with a swivel arm, is arranged on the supporting beam part projecting forward.

The axis of rotation 44, which may be the center of the physical axis of rotation or the geometric axis of rotation, is present, as can be seen in particular in FIG. 3, in the vicinity of the vertical plane of the vertical side wall 45 of the machine frame or the support beam 33. According to FIG. 3, it stands in front of its vertical plane 45. It can also be shown that the bending table is mounted on an extension 46 projecting beyond the vertical side wall 45.

As can be seen from FIG. 2, the beam-shaped support 33 is arranged in such a way that there is a free space below this support up to the base of the machine frame. As a result, the tube 47 can be bent in such a way that parts of the bent tube can reach under the bending table and also the support beam 33 of the bending table.

With 48 the slide rail is designated. This is moved in the indicated double arrow direction 49 in the radial direction of the bending template 50 arranged on the bending table 43 by a hydraulic cylinder arrangement 51. In order to achieve the transfer to the slide rail, a component 52 is provided, which consists of the leg 52a and the leg 52b . Transversely to the drive 51 there is a piston-cylinder arrangement 53 which serves to move the slide rail in the indicated arrow direction 53 'and thus in the longitudinal direction of the support beam or tangentially to the bending template, so that the slide rail moves along when the tube is bent. The bending table 43 and thus the bending template 50 is rotated by the hydraulic motor 54 with a worm shaft 55 and the drive worm 56, likewise shown in FIG. 3 and shown in broken lines.

The hydraulic drives 51, 53 and 54 are shown essentially schematically in FIG. 3 and in their spatial arrangement with respect to one another. They form a structural unit 57, 58, which is described in detail below in connection with FIGS. 4 to 7.

Figure 4 shows that the bending table 43 is mounted on a structure 46 which is screwed to the side wall 45 of the beam-like support 33 by means of screws 59 and 60, with the result that the axis of rotation, here the center of the axis of rotation 44, projects beyond the side wall 45 . With 56 the worm wheel is designated, which is provided with an assigned shaft 55, which starts from a hydraulic motor 54 which cannot be seen in FIG. Running laterally and in parallel is the piston-cylinder arrangement 51, consisting of the cylinder 51a, the piston 51 and the piston rod 51c, which is fastened to a carrier 52 which, with regard to FIG. 3, has a different spatial arrangement, but the same It has functions because it moves the slide rail (not shown in FIG. 4) in the indicated double arrow direction 49, so that the slide rail comes into contact with the pipe to be bent or is removed from it.

4 shows a rotary encoder 61 which is provided at its lower end with a chain wheel 62 so that the respective rotation of the bending table, the respective rotation of the bending table, is detected via a chain 63, connected to a chain wheel 64 on the rotationally symmetrical bending table.

FIG. 5 shows the hydraulic motor 54, which cannot be seen in detail from FIG. 4, with its outgoing shaft 55, which is connected via a bushing 65 and associated wedges 66, 66a is connected to the worm shaft 56a of the worm 56. The worm shaft 56a is supported in the aforementioned housing 46 which supports the bending table.

Figure 5 shows the slide rail 48 which is mounted on the carrier 52b. As can be seen in principle from FIG. 3, this is displaced radially to the bending template 50 in the indicated double arrow direction 49 by the cylinder 51a, the piston rod 51c of which is fixed to a fastening 52. Since the piston can be hit on both sides, the cylinder wall 51a, which is connected to the slide rail, is displaced. Figure 4 shows the position in which the slide rail has moved up to the pipe to be bent. The movement takes place on a rail 67 shown in FIG. 5.

The movement of the slide rail 48 in the longitudinal extension of the supporting beam and thus for migration with the clamped tube takes place via a piston rod 53b shown in FIG. 5 and a piston-cylinder arrangement 53 also shown in principle in FIG. 3, the piston 53c of which can be seen in FIG is designed in such a way that it can also be moved in the cylindrical housing 53c when it is acted upon from two sides. On the piston rod 53b there is a bar 52a which, as can be seen in principle from FIG. 3, is connected to the slide rail 48.

FIG. 6 shows, in the same way as FIG. 4, the rotary encoder 61 with its sprocket 62 arranged below the carrier 45, furthermore the chain 63 and the sprocket 64 present on the bending table.

Figure 7 shows particularly clearly that the bending table 43 is designed as a rotating body. It is mounted in the structure 46 with its end face 46a in two spaced-apart tapered roller bearings 68 and 69. The bending table consists of the sleeve 70, which is closed at the top by a cover 71 via screws 72 and at the bottom by a bushing 73 via screws 74 . Between the aforementioned tapered roller bearings 68 and 69, the rotating worm wheel 75 is fixed to the sleeve 70, in which the worm 56 of the hydraulic motor 54 engages. The sleeve 70 is designed as a cylinder. It has a piston 76 in its interior which is effective on both sides. The piston has a downwardly projecting piston rod 77, which serves as a guide, and an upwardly projecting piston rod 78, which in its upper region has a step 79 formed by a stepwise reduction in the diameter. There are two cylinder spaces 80 and 81 in the cylinder, the cylinder space 80 being connected to the inlet 80b via a channel 80a, the cylinder space 81 being connected to the inlet 81b via a channel 81a. If pressure oil is filled in via the inlet 80b, this results in an enlargement of the cylinder space 81 with the lifting of the piston and its piston rod 78.

The bending template 82 consists of the upper bending template part 82a and the lower bending template part 82b, with a dividing line in the middle of the groove 83. The upper bending template part 82a also has a step so that the upper bending template part is firmly connected to the piston rod 78 via the screw 85.

The lower bending template part 82 is provided with an extension 86, which is conical in its lower region 86a and which widens outwards, so that in connection with the likewise conical ring 87 in connection with a wedge 88 and fastening screws 89, it is secure against rotation Connection between the bending table and bending template 82 takes place. The ring 82 consists of two halves.

If the piston is raised with its piston rod 78 via the inlet 81b, then the upper bending template part 82a is raised at the same time. However, if oil is filled in the reverse way via the inlet 80b, the piston 76 is moved downward and the upper bending template part 82a is correspondingly applied to the lower bending template part 82b. The clamping position is shown in Figure 8, the open position in Figure 9. Both bending template parts have quarter-circular grooves 83a and 83b over their main circumference. In order to clamp the pipe to be bent, an outwardly projecting collar 90 is provided on part of the circumference, which has a groove 83c of semicircular cross section. This collar also has a continuation 92 projecting downward over the parting plane 91 of the two bending template halves.

These previously described design of the upper Biegeschablonenhä fte _l serves as Spannbäcke for clamping the tube at the bending template.

Figure 11 shows the support beam 33 as a tube with a rectangular cross-section to which the rail 34 is welded. This carries, via a welded-on intermediate rail 93, the welded-on toothed rack 94, in which the drive of the feed cheek engages.

Figure 12 shows that the body 46 is screwed to the side of the support beam, which is provided with an angled part 46a and with the bending table 43 and the drives 54, 51, 53 is a structural unit.

2 has a length of the support beam of 3 to 4 meters and a height of 1 meter. The support beam according to FIGS. 11 and 12 has a width of 15 cm and a height of 10 cm. The running rail 34 is 12 cm wide.

Claims (23)

1. Pipe bending machine with an elongate machine frame, at the upper side of which and in the region of a longitudinal edge is moved the feed carriage (35), which carries the clamping sleeve (36) clamping the pipe (47), the bending table (43), which is rotatable about a vertical axis of rotation and at which the bending template (82) is fastened, is furthermore present at a head end of the machine frame, and the bending template furthermore co-operates with a clamping cheek (82a) as well as with a slide rail (48) present in the region of the upper longitudinal edge at the side of the feed carriage, the bending table (43) is furthermore borne at the head end of a flat beam-shaped carrier (33), which is carried by a machine frame (31) and projects forwardly in the longitudinal extent thereof, a free space is present underneath this beam-shaped carrier as far as the base of the machine frame, characterized in that the rotational centre (44) of the bending table (43) is displaced from the longitudinal centre of the carrier (33) towards the side which is remote from the region of the longitudinal edge, along which the feed carrier (35) is moved.

2. Pipe bending machine according to claim 1, characterised in that the rotational centre (44) of the bending table lies outside the frame wall (45) of the carrier (33).

3. Pipe bending machine according to claims 1 and 2, characterised in that the drive (54, 55, 56) of the bending table (43) is transverse to the longitudinal extent of the machine frame (31) or the carrier beam (33) carrying the bending template at the side of the feed carriage (35) or of the slide rail (48).

4. Pipe bending machine according to claim 3, characterised in that the drive (54) of the bending table and the drive (51) of the slide rail (48) are present in one constructional unit.

5. Pipe bending machine according to claim 4, characterised in that the constructional unit additionally comprehends the clamping cheek (90) and its drive (76, 78).

6. Pipe bending machine according to claim 4, characterised in that the constructional unit displays a further drive (53) for the movement of the slide rail (48) in longitudinal direction of the carrier (33) or tangentially to the bending template (50).

7. Pipe bending machine according to the claims 4 to 7, characterised in that the constructional unit is screwed to the carrier (33) of the bending template.

8. Pipe bending machine according to claim 4, characterised in that the drive (54) of the bending table (43) and the drive (51) of the slide rail for its movement in radial direction of the bending template (50) extend each parallelly to the other.

9. Pipe bending machine according to claim 3, characterised in that the drive (54) of the bending table (43) consists of an hydraulic motor, at the outgoing shaft (55) of which is fastened a worm shaft (56a) with a worm wheel (56), which drives the bending table by way of a worm wheel set (75) surrounding the bending table (43).

10. Pipe bending machine according to claim 4, characterised in that the drive of the slide rail (48) in radial direction to the bending template consists of an hydraulic piston-cylinder arrangement (51), which is arranged above and displaced laterally of the hydraulic motor (54) for the drive of the bending table (43).

11. Pipe bending machine according to claim 6, characterised in that the drive of the slide rail (48) in longitudinal direction of the machine frame consists of an hydraulic piston-cylinder arrangement (53), which is arranged above the hydraulic motor (54) and extending tranversely thereof.

12. Pipe bending machine according to claim 1 and one or more of the claims 2 to 8, characterised in that the bending table (43) is constructed to be rotationally symmetrical.

13. Pipe bending machine according to claim 12, characterised in that the bending table (43) is arranged in a housing (46), which carries the drive worm (56) and screwed to the side wall (45) of the carrier beam (33).

14. Pipe bending machine according to claim 13, characterised in that the bending table (43) is provided at half the height with an encircling worm wheel (75).

15. Pipe bending machine according to claim 12, characterised in that the bending table (43) consists of an outer shell (46, 46a) and an inner sleeve (70), wherein the worm wheel (75) is arranged at the sleeve (70) in the space between shell and sleeve.

16. Pipe bending machine according to claim 15, characterised in that the sleeve (70) of the bending table (43) is constructed in its interior as cylinder, in which a double-acting piston (76) is arranged to be axially movable, wherein the piston is provided with a piston rod (78) projecting upwardly out of the cylinder, the bending template (82) is furthermore in the centre of its encircling groove (83) subdivided in the horizontal plane into a lower bending template part (82b) and an upper bending template part (82a), wherein the lower bending template (82b) is connected with the sleeve (70) and the upper bending template part (82a) is connected with the piston rod (78) drivable out of the sleeve (70).

17. Pipe bending machine according to claim 13, characterised in that the upper bending template part (82a) at a part of its circumference has a collar (90), which projects beyond this circumference and displays a semicircularly shaped groove (83c) serving as clamping cheek.

18. Pipe bending machine according to claim 14, characterised in that the collar (90) with the semicircularly shaped groove (83c) has a prolongation (92) projecting downwardly beyond the groove.

19. Pipe bending machine according to claim 12, characterised in that the bending table (43) is greatly narrowed conically in its upper region above the plane of the beam carrying it and the lower bending template part (82b) preferably likewise displays a matched cone.

20. Pipe bending machine according to claim 15, characterised in that for the fastening of the lower bending template part (82b) to the bending table (43), a conical ring (87) is present, which engages over the conical lower region of the lower bending template part (86a) and the upper conical region (71) of the bending table (43) and is retained at these by fastening elements (89).

21. Pipe bending machine according to claim 1, and one or more of the claims 2 to 14, characterised in that a chain wheel (77), which surrounds the bending table (43) is connected by way of a chain (63) with the pulse pick-up (61) borne at the carrier beam (33), is present at the rotationally symmetrical bending table (43) closely below the carrier beam (33) carrying the bending table.

22. Pipe bending machine according to claim 2, characterised in that the one beam-shaped carrier (33) consists of a pipe of rectangular cross- section, to which the running rail (34) of the feed carriage (35) is welded at a longitudinal edge and projecting beyond this.

23. Pipe bending machine according to claim 22, characterised in that the toothed rack (94) is welded on below the running rail (34) and projecting outwardly relative to this.

Images