EP0201729A2 - Device for the production of wrapped tube as well as a wrapped tube - Google Patents

Abstract

The device permits not only the production of cylindrical portions but also of conical portions. In addition, the invention claims protection for a correspondingly shaped conical tube. Conical tube portions are formed by virtue of the fact that the series of rolls containing the two driven rolls which roll on one another and containing the back-pressure roll is pivotably arranged and that guide rolls gripping the respectively most recent turn on the outside and on the inside are adjusted to the changing diameter. This is preferably accomplished with the aid of an electric circuit, for example in the form of a microprocessor. <IMAGE>

Description

The invention relates to a device for producing a winding tube from a strip with a continuous or interrupted connection of adjacent windings, with a roller set consisting of a driven lower roller, a driven upper roller and a freely rotatable pressure roller, with a pair of rollers in front for the feed of the strip , with a guide for a section of the most recent turn and with a receptacle for aligning the finished tube with respect to the guide and with respect to the roller set, the roller set being pivotable about an axis which runs parallel to the central axis of the still stretched strip; in addition, the invention relates to a coiled tube which consists of a strip of metal or plastic wound into a tubular jacket, the adjacent windings of which are fastened to one another by means of welding with the aid of a fold or by knotting overlapping areas in a corrugated strip.

Coiled tubes have been known for a long time. They are used in particular for guiding conditioned air in buildings, since they are relatively cheap to manufacture, sufficiently air-tight and also light-weight, so that they can be installed in suspended ceilings, for example, without additional measures. Furthermore, there are other applications, such as the outer formwork of cylindrical concrete columns, which is increasingly being made from a winding tube with a seam connection.

The pipes mentioned are manufactured on relatively simple machines and cut to length as required, the transport length and general handling primarily determining the maximum length. The manufacturing devices also allow a theoretically unlimited pipe length.

The reductions or expansions from one nominal size to another, which are required in ventilation technology, for example, are produced separately on specially designed devices, namely by winding up a flat, cut outer surface to form a cone section, which is then closed at its longitudinal seam or at its longitudinal seams. At the ends of the cone section shaped in this way, cylindrical connecting pieces are attached in order to enable easy coupling to the air lines, which are otherwise made of a winding tube. As a result, the reductions and expansions require a disproportionate effort, which is clearly noticeable in costs per linear meter. In addition, the constrictions and transitions are often unnecessarily rugged, which is detrimental to low-loss air flow. However, this property has so far been accepted.

It is therefore an object of the invention to improve a device of the type mentioned in the introduction in such a way that the expenditure for conical raw pipes or also formwork for concrete is greatly reduced.

To achieve this object, the invention proposes that the swivel angle from the central position is approximately 30 ° in one direction and approximately 30 ° in the other direction, that the guide consists of spherical rollers, and that each roller is guided in an approximately radially movable manner and is detectable or can be moved synchronously with the feed speed depending on the swivel angle.

The invention gives up the practice practiced hitherto of a device which has been set once and is matched to a specific diameter and allows variations during the run, in particular with regard to the diameter, which are caused by an inclined roller set. The interdependent control of the inclination of the roller set and the roller guides with regard to the diameter can take place via cam disks, but it is more advantageous to use a microprocessor, which uses servomotors and a corresponding query of the actual position or via stepper motors, which contain this information from the start individual movements.

In connection with a continuous determination of the diameter of the wound tube one turn behind the most recent turn, a roller set which can be pivoted by a few angular degrees has already become known in the prior art, the pivoting of which is changed in accordance with the measuring control to determine the continuously produced diameter. As soon as the tolerance range in one or the other direction in the measurement of the diameter is exceeded or undershot, a corresponding circuit ensures a correction of the swivel angle, for example downwards, if the diameter has become too large. The continuously wound diameter then decreases in the smallest amounts per turn until the lower tolerance limit is reached. The roller set oscillates between the tolerance limits. The result is a tube that goes in has a cylindrical shape on the outside, but when measured more precisely it turns out to be a corrugated tube, but with a very long wavelength.

Since the pipes are continuously cut from the oldest windings according to their intended use and ease of handling, it is left to chance whether the required pipe section is cut off at a point of small diameter, large diameter or medium diameter. In practice, this results in difficulties when inserting pipe connections that are no longer predictably true to size.

The invention expressly does not adopt this principle for the production of a cylindrical tube, but instead makes use of the possibility of producing conical tube sections by extreme pivoting of the roller set if they are needed. Of course, the device according to the invention also makes it possible to produce cylindrical tubes, in which case the device is operated in accordance with a conventional device, that is to say the setting of the diameter is brought about primarily by the guide and by the position of the pressure roller.

In the simplest case, there is a plate in which guides for sliding blocks are embedded, which in turn carry holders for the actual rollers. The course of the guides is chosen so that, with a medium-sized diameter, each guide runs approximately radially to this pipe diameter. The consequence of this is that, in the case of smaller and larger diameters of a winding tube, only that roller in the strict sense can be radially adjusted, the guide of which points in the direction of the two driven rollers of the roller set; With these latter diameters, all other rollers are no longer adjusted radially in the strict sense, but only approximately radially. These deviations do not cause any further problems, since it is not a question of 100% radial guidance, but only that each roller is correctly positioned with a corresponding diameter.

So far, either known outer guides or inner guides are available in known devices for the production of winding tubes. In the case of a folding tube, for example, an outer guide must be provided with corresponding recesses for the fold, so that the outer guide approximately represents the negative of, for example, a three-quarter turn. This makes it clear that a separate external guide is required for each different bandwidth, which also applies to the variation of the wall thickness, since the nominal width is measured inside. This effort is not necessary with internal guides, but it is not easy to observe whether the resulting winding tube is actually tight against the internal guide.

To avoid these problems, the invention proposes that each roller of the guide is designed as a pair of double rollers touching the tube outside and inside, the contour of each roller preferably being spherical. As a result of this measure, the most recent turn is guided on the outside and inside, with a diameter which is too small being noticeable on a turn deforming into a polygon and a diameter which is too large is noticeable on a tendency to buckle between two adjacent rollers. In this way, excellent diameter control is provided by optical observation of the most recent winding.

In the production of conical sections of a winding tube, it is essential that the rollers are displaced during operation and form a guide, for example, for an expanding cone. This diameter widening is required continuously until the transition, for example, into a cylindrical section or during the transition into a conical section opposite in relation to the taper, in the course of which the diameter becomes increasingly smaller again, i.e. it is necessary to continuously adjust the rolls to smaller diameters during the winding process. This is the only way to perform the management task without damaging the resulting pipe.

This simultaneous adjustment of all rollers or double rollers is preferably effected with the aid of actuating or stepping motors which are controlled by an electrical circuit.

With a corresponding adjustment of the angle of inclination for the roller set with the aid of an actuating or stepping motor and when it is connected to the same electrical circuit, the following process takes place if, for example, a reducer for a line section of conditioned air is to be produced from one nominal diameter to the other: First a cylindrical section is wound in the usual way, which later serves as a connector for the one line end. This connector was reached after about three turns. As a result of a command from a program or also as a result of a manual command, following the first three turns, the roller set is pivoted upwards by an angle of, for example, 10 °, which is within approximately 1 1/2 turns should be completed. During this rather slow pivoting, the center point of the wound tube changes when the pivot axis for the roller set lies outside the contact line between the two driven rollers. This change in the center is automatically and continuously compensated for by the shifting of the rollers.

The increasingly effective pivoting position of the roller set also requires the guide to open, that is to say an adjustment of the rollers to a larger diameter, the diameter relationships being reproduced in the electrical circuit as a function of the pivoting angle of the roller set and the feed rate. Since these parameters are known, there is a constant comparison of the target values and the actual values for the position of the individual rollers, which in the event of deviations leads to an immediate correction in the direction of the target position.

As soon as the larger nominal diameter is approximately reached, the swiveling of the roller set is gradually reduced again, for which purpose one turn or less (the diameter is now larger) is required. Simultaneously to this change in the setting of the device, the opening of the guide is stopped by moving the rollers apart, since after the set of rollers has been pivoted back into the starting position, a cylindrical tube section is created again, which requires immobile, continuous guidance. After completing approx. 2 to 3 turns, the transition piece is finished and is cut off from the last turn. Of course, a similar process can also take place immediately in reverse order, so that at the end there are two reducers which only have to be separated from one another in the middle.

In the above-mentioned process, relatively smooth transitions between the individual sections occur, since the pivoting movement of the roller set is carried out relatively slowly. With the help of a further development of the invention, which will be described in more detail below, it is also possible to produce changing diameters with relatively jagged transitions, which is necessary, for example, in pipes which, because of their external shape, serve as silencers.

According to this development, one of the pairs of rollers is provided with unequal rollers for bending the strip. In particular, there are four pairs of rollers, each with unequal rollers, which optionally bend the strip, the distance between the two unequal rollers being variable. For an automatic sequence or programmed sequence including the pairs of folding rollers, the change in distance is electrically adjustable and controllable, that is to say is effected with the aid of an actuating or stepping motor. The electrical circuit in the form of the microprocessor already described above is also expanded in this development by a switching unit.

• Sobald beispielsweise nach einem zylindrischen Abschnitt dem Wickelrohr eine sich stark verjüngende Formgebung verliehen werden soll, wird manuell oder durch eine Programmsteuerung dasjenige Rollenpaar mit ungleichen Rollen auf die jüngste Windung aufgesetzt, das eine Abkantung des Streifens nach innen bewirkt. Das Maß der Annäherung beider ungleichen Rollen aneinander bestimmt das Maß der Abkantung, wobei der Sollwert relativ rasch angefahren wird. Als Folge davon läuft auf die angetriebenen Walzen des Walzensatzes eine Abkantung zu, die an beinahe beliebiger Stelle davor durch das genannte Rollenpaar hervorgerufen worden ist. Wenn diese Abkantung den Walzensatz erreicht -die Lage des Rollenpaares ist bekannt und damit auch der vom Radius abhängende Umfangsabschnitt von dem Rollenpaar bis zu dem Walzensatz - wird der WaIzensatz entsprechend abwärtsgeschwenkt, so daß die beiden angetriebenen Walzen das abgekantete Teil des Streifens ohne wesentliche Rückverformung erfassen. Bei diesem Vorgang wird eine eventuell durch die Schwenkbewegung verursachte Mittelpunktsverschiebung automatisch ausgeglichen. Nachfolgend werden sich verjüngende Windungen erzeugt, bis das nach außen abgekantete Rollenpaar in Aktion tritt. Das den kleineren Durchmessern nachgeführte Rollenpaar wird relativ - schlagartig in einen geringen Abstand überführt, so daß sich eine definierte Abkantung nach außen ergibt. Im Augenblick des Einlaufens dieser Abkantung in den Walzenspalt des Walzensatzes wird dieser entsprechend verschwenkt, wobei der Betriebszustand des Kantens für etwa eine Windung beibehalten wird. Danach wird das Rollenpaar geöffnet und die Vorrichtung bringt anschließend einen Kegelabschnitt mit sich öffnender Spreizung hervor. Diese Vorgänge können beliebig oft und in beliebiger Reihenfolge wiederholt werden, um annähernd jede mögliche Form mit schroffen Übergängen zwischen den einzelnen Steigungsbereichen zu erzeugen.
• Zu den möglichen Formen von Wickelrohr gemäß der Erfindung, das mit der ebenfalls von der Erfindung umfaßten Vorrichtung herstellbar ist, gehören auch Rohre, die an ihrem einen Ende mit einer Steckmuffe versehen sind. Es handelt sich dabei im Prinzip um zwei zylindrische Rohrabschnitte, die unterschiedlich lang ausgebildet sind und zwischen . sich einen konischen Übergangsbereich für den Übergang von einem Durchmesser auf den anderen aufweisen. Selbstverständlich können auch gleich lange Abschnitte vorhanden sein, wenn die entsprechenden Wickelrohrstücke als Reduzier-bzw. Erweiterungselemente eingesetzt werden sollen. In jedem Fall entspricht der Innendurchmesser der Steckmuffen im wesentlichen dem Außendurchmesser des restlichen Wickelrohres, so daß die dieser Art gebildeten Wickelrohre zu einer endlosen Leitung zusammengesteckt werden können. Gegebenenfalls wird an den Steckverbindungen ein Dichtungsmittel eingelagert oder eingespritzt, auch selbstquellende Schäume können an dieser Stelle als Dichtungsmittel verwendet werden. Bei der Herstellung derartiger Rohre ist es besonders zweckmäßig, zwei Exemplare in einem Arbeitsgang zu fertigen, deren beiden Steckmuffen sich in der Mitte befinden und zunächst einstückig ausgebildet sind. Nach Fertigstellung des doppelten Exemplares wird in der Mitte der Verdickung der Trennschnitt vorgesehen, wodurch zwei identisiche Wickelrohre mit Steckmuffen entstehen.

It then contains a replica of the degree of folding by each pair of rolls with unequal rolls of a strip depending on the distance between the respective unequal rolls; in the case of a preselected specific bend, the roll set is then pivoted by the angle of the bend after completion of approximately one turn since the distance was set. With the help of this development, pipes with a relatively jagged transition from one diameter range to another can be produced, conical sections being able to adjoin conical sections or cylindrical sections. The process is roughly as follows:

• As soon as, for example, a strongly tapering shape is to be given to the winding tube after a cylindrical section, the pair of rollers with unequal rollers that causes the strip to bend inwards is placed manually or by program control. The degree of convergence of the two unequal rollers to one another determines the degree of the fold, the setpoint being approached relatively quickly. As a result, the driven rollers of the roller set run towards a bend, which has been caused by the aforementioned pair of rollers at almost any point in front of it. When this bend reaches the set of rollers - the position of the pair of rollers is known and thus also the circumferential section which depends on the radius from the pair of rollers to the set of rollers - the set of rollers is pivoted downwards accordingly, so that the two driven rollers grasp the bent part of the strip without any significant deformation . This process automatically compensates for any center point shift that may be caused by the swivel movement. Subsequently, tapering turns are created until the pair of rollers that are folded outwards comes into action. The pair of rollers following the smaller diameters is transferred relatively - abruptly into a short distance, so that there is a defined bend to the outside. At the moment of this chamfer running into the nip of the roller set, this is pivoted accordingly, the loading drive state of the edge is maintained for about one turn. The pair of rollers is then opened and the device then produces a cone section with an opening spread. These processes can be repeated any number of times and in any order in order to produce almost any possible shape with jagged transitions between the individual slope areas.
• The possible shapes of the winding tube according to the invention, which can be produced with the device also encompassed by the invention, also include tubes which are provided at one end with a push-in sleeve. In principle, these are two cylindrical tube sections that are of different lengths and between. have a conical transition area for the transition from one diameter to the other. Of course, sections of the same length can also be present if the corresponding winding tube pieces are used as reducing or. Extension elements are to be used. In any case, the inner diameter of the push-in sleeves essentially corresponds to the outer diameter of the remaining winding tube, so that the winding tubes formed in this way can be plugged together to form an endless line. If necessary, a sealant is stored or injected at the plug connections; self-swelling foams can also be used as a sealant at this point. In the manufacture of such pipes, it is particularly expedient to produce two specimens in one operation, the two push-in sleeves of which are located in the middle and are initially formed in one piece. After completion of the double copy, the separating cut is provided in the middle of the thickening, creating two identical winding tubes with push-in sockets.

If the coiled pipe has an outwardly outstanding, spiral-shaped joint fold, the inside diameter of the push-in sleeve can be selected according to the silhouette of the joint fold or according to the outside diameter of the actual pipe wall. In the first case, the connecting tube can be inserted into the plug-in sleeve without _t interference, in the second case, when connecting two winding tubes, an additional rotation in the manner of a screwing-in movement is required. The shapes described are not only limited to thin-walled pipes for ventilation purposes, but an application is also possible in the case of wound and continuously welded steel pipes, the device then being designed to be correspondingly stronger.

There is a significant need for a conical tube made with a device according to the invention. In the field of air conditioning technology, reference has already been made to transition pieces from one nominal size to another and to silencer pipes with changing diameters. In addition, formwork bodies can be produced, for example, which are cylindrical over a certain length and then spread conically. It is suitable, for example, for support beams on bridges and the like. If necessary, the conical section can be flattened into a shape that resembles a flat nozzle and has an oval shape in cross section. The latter tube shape can also be used successfully in air conditioning technology, for example, since the conical tube section acts as a diffuser and greatly reduces the exit velocity of the air flowing out in the cylindrical section.

• Figur 1 eine schematische Frontansicht einer erfindungsgemäßen Vorrichtung zur Herstellung von Wickelrohren mit zylindrischer oder konischer Gestalt,
• Figur 2 eine Ansicht eines Gleitsteins zur Aufnahme von Führungsrollen für das auf der Vorrichtung entstehende Wickelrohr,
• Figur 3 eine Stirnansicht des Gleitsteines gemäß Figur 2,
• Figur 4 eine schematische Seitenansicht eines Teils des schwenkbaren Walzensatzes,
• Figur 5 eine Ausschnittsansicht eines Rollenpaares zum Abkanten des in die Vorrichtung einlaufenden Streifens zur Bildung eines - schroffen Überganges zwischen einem kegeligen und einem zylindrischen Abschnitt und
• Figur 6 eine Ansicht gemäß Figur 5 als Ausschnitt eines Rollenpaares zur Erzeugung eines Übergangs zwischen einem zylindrischen und einem kegeligen Abschnitt.

An exemplary embodiment of a device according to the invention, which is shown in the drawing, is explained in more detail below; show in the drawing:

• FIG. 1 shows a schematic front view of a device according to the invention for producing winding tubes with a cylindrical or conical shape,
• FIG. 2 shows a view of a sliding block for receiving guide rollers for the winding tube formed on the device,
• FIG. 3 shows an end view of the sliding block according to FIG. 2,
• FIG. 4 shows a schematic side view of part of the pivotable roller set,
• Figure 5 is a sectional view of a pair of rollers for folding the strip entering the device to form a - jagged transition between a conical and a cylindrical section and
• Figure 6 is a view according to Figure 5 as a section of a pair of rollers to create a transition between a cylindrical and a tapered section.

FIG. 1 schematically shows a view of a device according to the invention for the production of winding tubes; the view is directed towards a plate 1, from which the winding tube produced continuously emerges towards the viewer. Inessential device parts like a front Directional stands or the like are not shown, since these things make no contribution to the representation of the actual invention. In the lower area, approximately in the middle, the plate 1 is provided with a cutout 2, within which a roller set 3 is pivotably mounted. This roller set 3 is shown in its horizontal starting position in FIG.

The roller set 3 consists of a driven lower roller 4 and a driven upper roller 5 (FIG. 4) as well as a pressure roller 6 on the side of the roller set 3, from which a sheet metal strip 7 runs into the nip. For better guidance of the incoming sheet metal strip 7, a pair of feed rollers 18 is also provided at a distance from the roller set 3, which pair is arranged in the position shown or clearly outside the plate 1, depending on the design of the roller set 3, for example 1 m to 2 m in front of the roller set 3rd

A certain type of sheet metal strip 7 can be processed with the aid of the illustrated device according to the invention. It is an essentially flat sheet metal strip with bevels on the edges, which are later compressed into a closed fold. A corresponding pair of rollers 4 and 5 is shown in FIG. 4. A groove for receiving and for completely closing a corresponding fold can be clearly seen in the driven lower roller 4. With the appropriate equipment, plastic strips can also be processed, which are joined together, for example, continuously or interrupted with the aid of ultrasound or using a roller seam welding process to form a winding tube. Strips of a corrugated aluminum can also be wound in an overlapping manner, the overlapping regions being pressed at regular intervals, as a result of which there is sufficient cohesion. Adhesive bonding, laser beam welding or clamping of adjacent turns to one another with almost any flat starting material as a strip is of course also possible.

Relative to an imaginary diameter, the plate 1 is provided with radially extending guides 10, in each of which sliding blocks 11 (FIGS. 2 and 3) are displaceably guided. The sliding blocks 11 carry rollers 13 and 14, which leave a guide gap between them approximately in the processed material thickness of the sheet metal strip, taking into account a certain tolerance and a certain play. The rollers 13 and 14 serve to guide the metal strip 7 in the most recent turn. The sliding blocks 11 form the end of a rack (not shown) or are fastened to a rack, in which the pinion of a stepping motor (also not shown, behind the plate 1) engages. With the help of these servomotors, each pair of rollers assigned to a sliding block 11 can be individually adjusted from the rollers 13 and 14.

It should be noted that the pair of rollers 13 and 14, which is guided in the guide 10 marked with the double arrow, only undergoes a true-to-diameter adjustment, while all other pairs of rollers require a corrected radial infeed, since the course is only radial with a single diameter, otherwise deviating from an exactly radial course. Such corrections in no way interfere with exact guidance, since they can be simulated electrically very easily, and the control of the stepper motors to bring about a specific guide diameter is consequently problem-free.

An important element in the device according to the invention is the pivoted roller set 3, which is shown schematically in FIG. The two rollers 4 and 5 are mounted in a swivel head 23 and connected via gears 21 and 22 to gears 26 and 25, which ensure that the rollers 4 and 5 roll on one another without slipping. On the shaft 21 in the extension of the gear 26, a pulley 27 for a toothed belt is arranged, with the help of which the rotation of the two rollers 4 and 5 is ensured. Deviating from this, an electric or hydraulic motor held on the swivel head 23 can be present at this point, which works synchronously with the drive for the feed roller pair 18 (FIG. 1)

The swivel head 23 is pivotally mounted in the plate 1 with the aid of lateral journal bearings 24, an adjusting device 28 taking over the setting and the feedback of the current setting. FIG. 4 shows the actuating device as a piston-cylinder unit 28, which, however, is generally only particularly suitable if only a certain swivel angle and then the starting position shown are approached again. When pivoting can be selected as desired, a screw-nut drive is recommended here, for example, which is set in rotation by an actuating or stepping motor. The stepper motor has the advantage that the number of controls can be counted in an electronic memory and thus always one Control over the position of the swivel head 23 is present in the electrical circuit, which has already been explained in detail in the introduction to the description.

In the manufacture of a conical transition piece from a nominal diameter to another, for example for an air line in air-conditioning technology made of folding tube, the sheet metal strip 7 is first inserted into the roll gap in a conventional manner and the pressure roller 6 is adjusted so that the diameter shown in FIG. 1 is wound . After a few turns, which will later be the connection piece of one nominal width, the swivel head 23 is pivoted clockwise by 10 ° with the aid of the adjusting device 28, for example in FIG. 4. This leads to an upward movement of the pair of rollers 4 and 5, which must be absorbed by a corresponding displacement of all pairs of rollers 13 and 14. Such a correction is not necessary if the pivot axis of the swivel head 23 is positioned, for example with the aid of links, that it lies in the region of the line of contact between the two driven rollers 4 and 5.

The pivoting movement of the swivel head 23 also results in an increase in diameter, which is automatically taken into account by the electrical circuit by withdrawing the pairs of rollers 13 and 14. When the swivel head 23 has reached its swivel position, a conical tube is formed in front of the plate 1, the opening of which facing the plate 1 is constantly increasing. Shortly before the new, larger nominal size is reached, the pivoting of the swivel head 23 is eliminated again, which stops the tube from growing. After the backward swiveling into the starting position, there are a few more turns to produce a connecting piece in the larger nominal size, and then the finished transition piece is cut off from the rest of the sheet metal strip caught in the device.

The different opening angles of the pipe cones are easily mastered by the spherical rollers 13 and 14, since there is essentially only point contact. It is therefore not necessary to change the distance between two adjacent rollers 13 and 14 in order to guide cylindrical or conical sections of a winding tube. With particularly small diameters, fewer pairs of rollers 13 and 14 are sufficient for guidance than shown; in this case, for example, every second pair of rollers is moved back to the starting position, where they are temporarily not involved in any leadership.

In certain cases it is advantageous if the transition, for example from a cylindrical to a conical section, is relatively abrupt. For this purpose, four pairs of rollers are accommodated on the plate 1 - these are not marked separately and can be arranged in almost any position - of which the details of two pairs are shown in FIGS. 5 and 6. Each pair of rollers is in turn located on a sliding block 31 on which a shaft 32 is fixedly attached, at the free end of which a freely rotatable roller 33 with a spherical contour is mounted. At a distance from it is another roller 36, the outer contour of which is designed in a J-shape with a shoulder 40. This roller 36 is also held by a shaft 35 which, however, is separately guided and movable in a sliding block 34 movable in a guide 37. The guide 37 is located within the sliding block 31, so that the J-roller 36 can be moved separately with respect to the spherical roller 33.

For this movement, the sliding block 34 is provided with a toothing in which a pinion engages. The pinion is connected to an actuator (not shown in each case) which rides on the sliding block 31. The shaft 35 of the J-roller 36 protrudes through an opening 39 in the sliding block 31, so that there is free mobility between the two rollers 33 and 36.

The pair of rollers shown in FIG. 5 serves to introduce a cylindrical section after a conical section, while the pair of rollers 33 'and 36' shown in FIG. 6 serves to introduce a conical section with a decreasing opening towards a cylindrical section. The effect of the folding of these two pairs of rollers on a sheet metal strip 7 is indicated by a dash-dotted line. For example, if a cone section, which is just being created on the device with a widening opening, is to be relatively - abruptly transition into a cylindrical section at a certain diameter, then the roller 36 is moved rapidly from the outside to the spherical roller 33, so that the sketched Bending of the metal strip 7 results. When the bend enters the gap between the two rollers 4 and 5, the swivel head 23 is swiveled back appropriately and quickly from a swivel position into the horizontal starting position, so that the folded area can pass through the nip without harmful forces. As soon as one turn of the pair of rollers 33 and 36 has been folded, the distance between the J-roller 36 and the spherical roller 33 is suddenly increased again. so that the edging stops. Subsequently, a cylindrical section is created, which has a relatively rugged transition compared to the conical previous section.

Corresponding conditions are taken into account if a relatively rugged transition from a cylindrical section to a conical section is to be carried out, the opening of which is becoming increasingly smaller. For this purpose, the pair of rollers 33 'and 36' according to FIG. 6 are used. For the transition from a tapered conical section into a horizontal section there is yet another pair of rollers, in which the two rollers 33 and 36 are exchanged with respect to FIG. 5; the same swap is present on a fourth pair of rollers compared to FIG. 6, which creates a transition from a horizontal section to a conical section with an opening diameter. This latter pair of roles is also not shown.

When processing corrugated metal strips 7 into a winding tube with a knob connection in the overlapping area, the rollers 13 and 14 are not spherical, but wedge-shaped, the wedge contour being immersed in a longitudinal groove of the metal strip 7. With large diameters or with wide sheet metal strips, the grooves within the sheet metal strip 7 run away from the plate 1 at a relatively large pitch angle. This fact must be taken into account, otherwise the flanks between which the wedge contour rolls will be damaged. For this reason, the sliding blocks 11 are provided with further threaded holes 12 ', apart from threaded holes 12, the central axis of which coincides with the normal, the central axis of which is pivoted transversely to the longitudinal direction of the guide. This essentially leads to a displacement of the rollers rotating on threaded bolts - the threads are screwed into the threaded bores 12 or 12 '- essentially tangential to the jacket of the winding tube, so that they essentially adapt to the pitch. These relationships are illustrated in FIGS. 2 and 3.

These adjustments to be made in connection with a changing slope of the device according to the invention lead, among other things, to the fact that the finished wound tube then projects at a different angle to the plate 1 in a horizontal plane. Instead, the de-erection of the sheet metal strip 7 to the plate can be changed so that the central axis of the tube protruding from the plate 1 remains the same, while the angle of entry to the plate 1 of the sheet metal strip 7 changes. Here, the invention follows known routes.

When producing conical tube sections, the center of the winding tube produced changes. Conventional, rigid guides for supporting the continuously wound pipe therefore fail. The following alternative solution is available here: In the course of the manufacture of a winding tube, after a few turns, a type of receptacle is inserted into the oldest turn, which is rotatably mounted on a feed slide. The feed carriage moves away from the plate 1 at the same speed at which the length of the tube progresses, that is to say depending on the feed speed and the pitch of the individual turns. In the axial direction of the tube, any relative movement between the recording and the tube produced is excluded. There is also no relative movement with regard to the rotary movement as a result of the rotating recording. The compensation of the possibly moving upwards and downwards can either be omitted, as long as only tapered sections with small opening angles are produced, or can be compensated in the vertical direction by actuation of the slide, which is also effected by the electrically controlled circuit. In some cases, a receptacle held in an upward tendency, for example with the aid of springs, is sufficient to absorb and compensate for these center fluctuations in the tube.

It was mentioned at the beginning that a winding tube according to the invention can also be used as a silencer. The jacket forming the tube has irregularly changing diameters along its longitudinal axis. So there are cylindrical and conical sections or or only conical sections strung together, whereby composite pipe sections or sections continuously produced with changing diameters can be used. The ends of the jacket are preferably provided with cylindrical connecting pieces, with the aid of which plug connections and the like can then be produced.

It is not absolutely necessary for the silencer to be made in one piece for a specific damping task. Depending on the space available in an air conditioning system, bends, branches or the like may be present between two sections of a total damper, it is only important that the desired sound insulation is achieved overall. Regardless of the one-piece or multi-piece design of the damper, the Ma ntel be provided with openings, in which case a preferably cylindrical protective tube is provided on the outside to cover the jacket.

The particular advantage of such mufflers is that there is no need for a packing which can often make it difficult or even impossible to keep clean air with high demands.

A muffler of this type is produced from winding tube in a particularly cost-effective manner. However, this is not a requirement. Other techniques can also be used to form tubes with a wave-like cross-section with an irregularly varying diameter, the individual tube sections being made up of individual parts which are soldered together, riveted together or connected in some other way, or a muffler section is made by inflating an initially cylindrical one Sheet metal jacket pressed into the cavities of a stable, two-part shape that later shaped the silencer tube. Protection is also sought for these types of muffler pipe independently of a winding pipe.

Claims (22)

1.Device for producing a winding tube from a strip with a continuous or interrupted connection of adjacent windings, with a roller set consisting of a driven lower roller, a driven upper roller and a freely rotatable pressure roller, with a pair of rollers in front for the feed of the strip with a guide for a section of the most recent winding and with a receptacle for aligning the finished tube with respect to the guide and with respect to the set of rolls, the set of rolls being pivotable about an axis which runs parallel to the central axis of the still stretched strip, characterized in that the Swivel angle from the central position is at least about 30 _° in one direction and about 30 ° in the other direction, that the guide consists of spherical rollers (13, 14) and that each roller (13, 14) is guided approximately radially and ascertainable or depending on the swivel angle synchronized with the feed speed is displaceable. 2. Device according to claim 1, characterized in that the movably guided rollers (13, 14) are helped on a plate (1) in which there are guides (10) for the rollers (13, 14) bearing sliding block (11) . 3. Apparatus according to claim 1 or 2, characterized in that each roller is designed as a pair of rollers outside and inside touching double rollers - (13, 14). 4. Apparatus according to claim 2 or 3, characterized in that each sliding block (11) with the aid of an actuating or stepping motor in its guide - (10) is displaceable. 5. Device according to one of the preceding claims, characterized in that the roller set (3) with the aid of a position direction (28), in particular with the aid of a stepping motor - is pivotable. 6. Device according to one of the preceding claims, characterized in that the driven rollers (4, 5) of the roller set (3) are driven with a variable-length cardan shaft. 7. Device according to one of claims 1 to 5, characterized in that the driven rollers (4, 5) of the roller set (3) are driven by means of a hydraulically or electrically operated motor which is synchronously with the same drive for the feed roller pair (18th ) is running, but it can be temporarily set to be leading or remaining. 8. Apparatus according to claim 4 and 5, characterized in that the adjusting devices for the sliding blocks (11) or rollers (13, 14) and for the roller set (3) are connected to an electrical circuit that the diameter changes in the electrical circuit of the tube as a function of the degree of pivoting of the roller set (3) is reproduced as target values for the position of the sliding blocks (11) or the rollers (13, 14), and that the sliding blocks continuously after a comparison of the actual values with the target values (11) or rollers (13, 14) can be tracked. 9. The device according to claim 1, characterized in that the center of the pivoting movement of the roller set (3) is approximately in the region of the line of contact between the upper roller (5) and the lower roller (4). 10. Device according to one of claims 2 to 9, characterized in that each sliding block - (11) at least two threaded bores (12, 12 ') for screwing in bolt-like roller carriers carries, and that the central axis of a threaded bore (12) is pivoted relative to the normal by a few angular degrees substantially tangentially to the outside of the tube. 11. The device according to claim 8, characterized in that with small pipe diameters, part of the sliding blocks (11) or rollers (13, 14) can be moved into a retracted starting position. 12. Device according to one of the preceding claims, characterized in that the feed roller pair (18) is arranged about 1 m to 2 m away from the roller set (3). 13. The apparatus according to claim 3, characterized in that at least one of the pairs of rollers with unequal rollers (33, 36) for bending the strip (7) is provided, and that the distance between the unequal rollers is variable. 14. The apparatus according to claim 13, characterized in that four pairs of rollers with unequal rollers (33, 36; 33 ', 36') are present, that in each case one roller has a crowned and the other a J-shaped contour with a shoulder (40 ), and that the roller (33, 33 ') provided with a shoulder (40) is separately adjustable relative to the other. 15. The apparatus according to claim 14, characterized in that for adjusting the shoulder (40) provided roller (33, 33 '), a servomotor, in particular a stepper motor is provided, which on the sliding block (11) for the associated spherical roller (36, 36 ') rides. 16. The apparatus of claim 8 and 15, characterized in that in the electrical circuit, the degree of folding by each pair of rollers with unequal rollers (33, 36) of a strip depending on the distance between the respective unequal rollers is simulated from each other that a certain one Bending is preselectable and that after completion of one turn since the actual setting of the distance, the roller set (3) can be pivoted by the angle of the bend. 17. Winding tube, consisting of a strip of metal or plastic wound into a tubular jacket, the adjacent windings of which are fastened to one another in a corrugated strip with the aid of a weld, with the aid of a fold or by vemop overlapping areas, characterized in that the tube is conical is. 18. The apparatus according to claim 17, characterized in that connect to the conical tube cylindrical sections with soft transitions. 20. winding tube according to claim 17 or 18, characterized in that a plurality of conical sections of different spread or opposite taper adjoin each other. 21. Wickeri tube according to claim 20, characterized in that a relatively rugged transition from one section to the next is provided by a bend within the strip along a turn. 22. Wickeri tube according to claim 18, characterized in that a rugged transition according to claim 21 is present instead of the soft transition. 23. Wickeri tube according to claim 21 or 22, characterized in that at one end a push-in sleeve is formed with a conical transition to the rest of the tube, the inside diameter of which corresponds to the outside diameter of the rest of the tube.

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