DE4124356C1 - Pipe bending machine with clamping head on frame - which forms support column with top cantilever arm whose free end forms bearing for rotary head - Google Patents

Abstract

The bending machine clamping head rotates in the main frame, in which it can slide along the main axis and works via fixed and movable formers on the pipes etc., passed from parallel array in the adjacent magazine into the main work axis. The main frame forms a support column (1) whose top end horizontal arm (2) carries the clamping head (11) for power rotation at the free arm end (2a). The main axis (A) is vertical and the bending head slide runs on the column below the arm. The column can pivot from a loading position, with the head near the magazine, round vertical axis (V) into an unload position. The magazine is of a suspended type (16) taking the pipes (12) slung vertically from their top end (12a). USE/ADVANTAGE - For pipe etc. bending, with compact design, reliable and precise operation.

Description

The invention relates to a bending machine for long, thin Strands, especially pipes, with a base frame, with one can be driven in rotation on the base frame around a main axis mounted clamping head, with one on the base frame in the direction the bending axis slide with a Bending head, which is fixed in the area of the main axis Fitting and one around a perpendicular to a the main axis containing plane (bending plane) running pivot axis has pivotable counterpart, with a next to the Base rack arranged magazine, in which several to bending strands parallel to each other and parallel to Main axis are arranged, and with a loading device, by means of which the strands are removed individually from the magazine are acceptable and can be brought to the main axis.

In such a known bending machine (US 32 45 433) the main axis is arranged horizontally and accordingly The bending head slide on the base frame is appropriate valley shiftable. The clamping head is in the middle of the bottom arranged frame so that a second bending head slide with a second bending head on the first bending head opposite side of the clamping head space fin det. The magazine is on one long side of the base frame arranged and has several, inclined downwards Slides on which the strands to be bent, such. B. Wire rods or pipes. Because this bending machine and their magazine mainly in the horizontal direction stretch is proportional to their arrangement large area required. It should be taken into account that around the main axis a relatively large work space of 1 m diameter, for example must, so that parts of the curved strand during the Bie gens not with the base frame or the magazine kolli dieren. Accordingly, the charger must be one  have a correspondingly large stroke, in each case one strand from the magazine to the main axis. The horizontal Arrangement of the strands has the further disadvantage that the Loading device with two or more loading arms with grippers must point, otherwise the one to be inserted into the clamping head String would sag too much and when inserting un would make controlled movements. That would also be It is difficult to insert the strand into the bending heads. By the multiple arrangement of loading arms and grippers ver manufacturing and maintenance are also expensive cost for the charger. With the well-known bend every bending head starts bending on the outside free end of the strand. However, the more the Bending head when bending further strand sections of the instep approaching head, the longer it gets over the bending head protruding part of the strand that has already been bent several times. This hangs down due to gravity and he difficult to make further bends. Furthermore suffers from the weight of the overhanging curved strand partly also the bending accuracy. Since with the known Bending machine horizontally next to the strands to be bent are arranged one on the other and on the inclined Sliding the magazine down gradually, can it happens that one of the strands partially over the others slip and then cross a few strands. This can jam the strands in the magazine men. Problems also occur when one after the other Strands of different lengths and / or differences Lich diameter should be bent. Because there a long machine side always for unloading the curved Only the second machine is left stranded long side available to accommodate a magazine. This magazine must first be completely emptied before Strands with different lengths and diameters in the magazine  can be introduced. Usually there are still changes work on the magazine itself and on the loading device required so that longer set-up times result. After all, it is also difficult, which is essentially Lichen bent in the horizontal direction Strands by an unloader from the instep head and the bending heads removed and on a slide thrown away, ordered and as space-saving as possible to be transported further.

The invention is therefore based on the object Bending machine for long, thin strands, in particular Pipes, of the type mentioned at the beginning, to create one has a small footprint, is reliable and accurate works, a simplified design of the loading direction possible and possibly also from several Magazines can be loaded without significant changeover times can.

This is achieved in a generic bending machine according to the invention in that the Base frame is designed as a support column that on her has a horizontal cantilever at the top sen free end the rotationally driven mounting of the instep is done with the main axis arranged vertically and the displacement of the bending head slide below of the cantilever on the support column, and that the support column with the cantilever arm from a loading position in which the chuck is near the magazine to a vertical axis into a bend distant from the magazine position and, if necessary, swivel into an unloading position bar, the magazine being designed as a hanging magazine is in which the strands are each at their upper end held and arranged vertically hanging.  

The invention is therefore based on the basic idea that to be bent vertically hanging in the magazine arrange, hanging from the magazine the clamping head and the Pass the bending head and then that of the instep Head hanging vertically downwards, starting on lower end, according to its different sections to bend each other. Due to the hanging arrangement of the Strands in the magazine and the bending of the hanging strand The new bending machine requires a relationship moderately small space requirement. The construction of the drawer device is simplified, because for the vertically after hanging strands individually by the grapple of the loading device may be only one Loading arm and a gripper required. Besides, can project the magazine close to the clamping head. It he this gives a short loading stroke of, for example only 100 mm, which also ver the loading device simple and to accelerate the charging process contributes. The short loading stroke is due to the fact that the support column with the cantilever arm into the bending position is pivoted as soon as the strand to be bent by the Collet of the chuck was taken over. In the Bending position is the main axis in sufficient ab stood from the magazine, so that the bie line within a work area of for example, can move 1000 mm diameter freely. The vertically hanging, already curved part of the Stranges is only down in the direction of the strand axis acting gravity and not - as in the case of horizontally working bending machines - a one-way action Exposed to gravity. This allows the bending area speed and the bending accuracy increased the. A particular advantage of the bending machine is also in that around the swivel range of the collar poor two or more magazines for holding strands  different length and / or different through knife can be arranged. That way you can successively or alternately strands of different Magazines can be removed and bent without first a magazine can be completely emptied or converted got to. Retrofitting the clamping head or the bending head is not necessary because the movements of the instep head and the bending head electronically according to corresponding stored programs can be controlled. To Any bent strand can end the bending process hanging from a conveyor at its upper end from which he was also hanging and lying can be transported exactly.

A particularly advantageous embodiment of the invention is that the clamping head relative to the main axis is horizontally displaceable (cf. claim 2). Slidable by this The bent strand can be made after all the bends have been made, for example, from the shaped pieces of the bending formed as bending rollers head moved out and at the unloading station Hanging slide or another conveyor be handed over. There is therefore no separate Ent loading device with a separate gripper. Furthermore the unloading process is also accelerated because the Collet of the chuck has from the previous bie still grasped the top of the strand, so that the unloading process directly on the bend process can connect.

Further advantageous embodiments of the invention are characterized in the remaining subclaims.

The invention is in the following using several in the drawing presented embodiments explained in more detail.  

Show it:

Fig. 1 is a side view of the bending machine,

Fig. 2 is a plan view thereof,

Fig. 3 is a partial view of the bending machine during unloading,

Fig. 4 is a schematic plan view of the bending machine with two magazines,

Fig. 5 shows an embodiment of the bending machine with a separate unloading device.

The base frame of the bending machine consists of a vertical support column 1 , which has a cantilever arm 2 at its upper end. The support column 1 is mounted on a turntable 3 with a vertical axis of rotation and can thus be pivoted about the vertical axis V. At the free end 2 a of the cantilever, a motor 5 and a gear 6 are flanged. The output shaft 7 of this gear 6 is arranged coaxially to the vertical main axis A of the bending machine. A carrier 8 , which has a horizontal guide 9 for the clamping head slide 10 , is fixedly connected to the output shaft 7 . The chuck 10 carries the chuck 11 , which has a known collet, not shown Darge. The collet serves to grasp and clamp the upper end 12 a of a strand 12 to be bent. The strand is, in particular, long, thin pipes, as found in motor vehicles as injection lines, brake lines, hydraulic lines, fuel lines or the like. Ver. But it can also wire strands of solid material, such as. B. spring steel. With means of the clamping head carriage 10 , the clamping head 11 is displaceable in the horizontal direction relative to the main axis A. In an end position of the carriage 10, the clamping opening of the collet of the clamping head 11 is aligned with the main axis A. By means of the gear 6 and the carrier 8 , the clamping head 11 can be pivoted in this position about the main axis A in any rotational angle position. This rotational angle position then determines the respective bending plane of the strand 12 .

The support column 1 also has a vertical guide 13 on which the bending head carriage 14 is vertically slidable ver. The drive of the bending head slide he follows by means of a motor 4 via a spindle, not shown. The bending head slide 14 carries the bending head 15 , which has, for example, a stationary roller 15 a (shaped piece) and a bending roller 15 b (counter shaped piece) pivotable about the horizontal pivot axis S. The pivot axis S extends perpendicularly to a plane passing through the main axis A. This plane is also known as the bending plane.

A magazine 16 is provided outside the swivel range of the cantilever arm 2 and the main axis A. This Maga zin 16 is designed as a hanging magazine, in which the strands 12 are each held at their upper ends 12 a and are arranged vertically hanging. The magazine 16 can be designed, for example, as a vibratory conveyor, with several conveyor tracks, in the exemplary embodiment shown there are four, are arranged side by side. It is therefore in the exemplary embodiment shown from a four-row hanging magazine 16th Instead of vibrating conveyors, several inclined slides can also be arranged next to one another, in which the strands to be bent are also suspended at their upper ends 12 a, so that they hang vertically downwards.

Furthermore, a loading device 17 is provided, which has a horizontally movable loading arm 18 with a gripper 19 . The loading arm 18 can be moved horizontally both in the direction R radially to the vertical axis V and in the direction T tangential thereto. By means of the loading arm 18 and its gripper 19 , the strands 12 each individually at their upper end 12 a can be detected, removed from the magazine 16 and moved to the clamping head 11 , so that then the strand axis of the respective loaded into the clamping head 11 loaded strand 12 aligned with the main axis A.

By rotating the turntable 3 , the support column 1 can be pivoted about the vertical axis V and thereby brought into different positions. In Fig. 1 and 2, the supporting column 1 with the cantilever 2 in its loading position Darge provides, in which the clamping head 11 is located in the vicinity of the slopes magazine sixteenth For the sake of clarity, only part of the cantilever arm 2 is shown in FIG. 2, the motor 5 , the transmission 6 and the carrier 8 not being shown. From the loading position L, the support column can be pivoted, for example, by 45 ° into its bending position B. In this bending position B it is sufficiently far from the hanging magazine 16 so that an obstacle-free working space with a diameter D of, for example, 1000 mm is created. After completion of the bending process, the support column 1 can be pivoted, for example, by a further 45 ° into an unloading position E, on which a slide 20 or a similar conveying device is provided, by means of which the bent strand can be removed hanging at its upper end 12 a.

The operation of the bending machine described so far is the following:

At the beginning of a working cycle, support column 1 and cantilever arm 2 are in their loading position L. The loading device 17 detects the upper end 12 a of a strand 12 from one of the four magazine rows by means of the gripper 19 . By moving the loading arm in the T direction, the strand 12 it is grasped is first removed from the area of the magazine rows and then moved hanging in the R direction into the open collet of the clamping head 11 . In the water position, the strand 12 is aligned with the main axis A. By moving the loading arm 18 in the direction R, the strand to be bent is also moved between the bending rollers 15 a, 15 b of the bending head 15 , which is fully loaded during the loading process excellent position is located near the clamping head 11 . In the drawing, the two bending rollers 15 a, 15 b are arranged vertically one above the other for the sake of clarity. However, this does not correspond to their position in the loading position, in which cher the smaller bending roller 15 b is pivoted by 90 ° about the axis S, so that the axes of the two bending rollers 15 a, 15 b lie horizontally next to each other and between one vertically at the bending rollers running slot is present in which the strand to be bent can be inserted.

After the strand to be bent has been brought in this way with its upper end 12 a into the collet of the clamping head 11 and also between the bending rollers 15 a, 15 b of the bending head 15 , the collet is closed. The Grei fer 19 opens and the loading arm 18 returns to its starting position. At the same time, the Biegekopfschlit th 14 is moved down by means of the motor 4 , so that the bending rollers abutting the strand 12 also move toward the lower end of the strand. While the bending head 15 is moving downwards, the support column 1 swivels into its bending position B. The first bending of the strand 12 can now take place by the smaller bending roller 15 b being pivoted about the axis S at a pre-programmed angle. As soon as this bend has ended, the smaller bending roll 15 b is pivoted back into its starting position, in which it is arranged horizontally next to the larger bending roll 15 a. The bending head 15 can now be moved by moving the bending head carriage 14 by a preprogrammed piece upwards. If the new bending of the strand is to take place in a different plane, then the strand firmly clamped in the clamping head 11 is brought into a different angle of rotation position by rotating the carrier 8 about the main axis A. Then the bending head 15 performs a new bend. This process is repeated until all the required bends of the strand are carried out and the bending head 15 has gradually approached the clamping or clamping head 11 . Once all of the bends are carried out, the supporting column 1 to pivot in their unloading position E. The bending roller 15 b is displayed next to the bending roller 15 a lying initial position pivoted in their horizon tal, as shown in Fig. 3. Now the chuck 10 is pushed ver along the guide 9 , which can be done radially outward, for example, with respect to the vertical axis V. The clamping head 11 is moved horizontally with respect to the main axis A, where the bent strand 15 a, 15 b is moved out of the gap between the hori zontally arranged bending rollers 15 a. The clamping head is shifted up to the position shown in broken lines in FIG. 3 above the slide 20 . There, the collet of the clamping head 11 is opened so that the upper end 12 a of the curved strand is released and this now hangs on the slide 20 . By tilting and / or vibrating the slide 20 , the finished bent pipe can be conveyed in an orderly manner in a hanging manner. After the clamping head 11 has returned to its starting position, in which its collet is aligned with the main axis A, the support column 1 with the cantilever arm 2 can be pivoted back into the loading position L.

If, instead of a multi-row hanging magazine, only a single-row hanging magazine is provided, or if one arranges the magazine rows radially to the vertical axis V, then the horizontally displaceable clamping head 11 can also be used simultaneously as a loading device. At the beginning of the loading process, the clamping head 11 is then moved with the open collet to the magazine, where it detects a single strand at its upper end 12 a. By subsequently moving the clamping head backwards, the detected strand is then moved to the main axis A and brought into alignment therewith.

In order to be able to bend strands of different lengths and possibly different diameters in succession or alternately without first completely emptying the magazine beforehand, several hanging magazines 16 , 16 'can also be provided according to FIG. 4 outside of the swivel range of the folding arm 2 each of which is equipped with its own loading device, not shown, unless the horizontally movable clamping head serves as the loading device. In one Maga zin 16 strands are then stocked, for example, with a length of 1.5 m, while the hanging magazine 16 'strands ge contains a different length, for example 0.9 m.

If, for example, two tubes with the stretched length 1.5 m are required one after the other in the production of an automobile, then these are successively removed from the magazine 16 and each bent in the bending position B. If a tube with the extended length 0.9 m is then required, then the cantilever 1 is pivoted with its cantilever arm 2 to the magazine 16 '(loading position L'), where the corresponding tube is removed and then bent at the bending position B.

It would also be conceivable, as shown in FIG. 5, to connect the clamping head 11 directly to the output shaft 7 via a support arm 21 . In this case, however, a discharge device 22 with a discharge arm 23 and a gripper 24 would then have to be provided at the discharge position. This gripper 24 detects the upper end 12 a of the curved strand. Then the collet of the chuck 11 is opened. By moving the unloading arm 23 in the direction C, the upper end 12 a of the bent strand is moved both out of the open collet and between the bending rollers 15 a, 15 b and finally handed over to the slide 25 or a similar conveyor. However, in this embodiment, the discharge device 22 should have a larger stroke.

Claims (7)

1. Bending machine for long, thin strands, in particular pipes, with a base frame, with a clamping head mounted rotatably on the base frame about a main axis, with a bending head slide displaceable on the base frame in the direction of the main axis with a bending head which has a fixed shape in the area of the main axis and has a counter-shaped piece which can be pivoted about a pivot axis running perpendicular to a plane containing the main axis (bending plane), with a magazine arranged next to the base frame, in which a plurality of strands to be bent are arranged parallel to one another and parallel to the main axis, and with a loading device, by means of which the strands can be removed individually from the magazine and brought to the main axis, characterized in that the base frame is designed as a support column ( 1 ) which has a horizontal cantilever arm ( 2 ) at its upper end and at its free end ( 2nd a) the rotationally driven storage of the chip nkopfs ( 11 ), wherein the main axis (A) is arranged vertically and the displacement of the bending head carriage ( 14 ) below the cantilever arm on the support column, and that the support column with the cantilever arm from a loading position (L), in which the Clamping head is located in the vicinity of the magazine, about a vertical axis (V) into a bending position (B) distant from the magazine and optionally into an unloading position (E), the magazine being designed as a hanging magazine ( 16 ) in which the Strands ( 12 ) each held at their upper end ( 12 a) and arranged vertically hanging. 2. Bending machine according to claim 1, characterized in that the clamping head ( 11 ) relative to the main axis (A) is horizontally displaceable. 3. Bending machine according to claim 2, characterized in that the horizontal displacement of the clamping head ( 11 ) takes place radially to the vertical axis (V). 4. Bending machine according to claim 2 or 3, characterized in that the rotationally drivable mounting of the clamping head ( 11 ) via a carrier ( 8 ) on which a clamping head carriage ( 10 ) is guided, via which the horizontal displacement of the clamping head takes place. 5. Bending machine according to one of claims 1 to 4, characterized in that at least one further hanging magazine ( 16 ') is provided. 6. Bending machine according to one of claims 2 to 5, characterized in that the clamping head ( 11 ) has a collet through which the loading device ( 17 ) can be replaced. 7. Bending machine according to claim 6, characterized in that at the unloading position (E) a slide ( 20 ) is seen before, to which the bent strand ( 12 ) - hanging at its upper end ( 12 a) - can be released from the collet .