HU223347B1 - Method and apparatus for producing helically wound lock-seam tubing - Google Patents

Abstract

In the process of forming a spirally wound, corrugated seam tube (33), a metal strip (12) is introduced into the tube (33) forming die (14). To prevent sliding weld (37) from slipping, particle deformations (41) are formed by means of a single forming unit (30, 34, 40). The process implement, in cooperation with a counter roller (34), has a flange roll (30) containing a recess (40) for engaging the locking deformations (41) on the toothed seam (37). Locking latch (16) for locking the bonding edges (16) of the metal tape (12) with helical welding tube (33) with longitudinal edges (16) wound from metal strip to helical weld (37) with longitudinal edges (16) 41), or a ribbon which is held together by the frictional seam (37) is inserted into the frictional seam (37) by frictionally securing the edges (16) of the metal strip (12) to one another by friction. ŕ

Description

SUMMARY OF THE INVENTION The present invention relates to a method of forming a helically wound, coiled seam tube from a metal strip having longitudinal edges, wherein the metal strip is led to a forming head, and is formed into a helical shape by joining the edges of the coiled metal strip to one another. the tube formed in the forming head is flanged into a helical suture, and the coiled coiled tube is led out of the forming head. The invention further relates to a device for forming a helically wound, corrugated seam tube made of a metal strip having longitudinal edges, a unit for wounding and wounding the metal strip in a helical winding 15 the edges of the tube formed in the forming head to a helical suture flanging unit, and the helical sutured coiled tube coiling out of the forming head. The present invention relates, thirdly, to a spiral-wound tube coiled from a metal strip with longitudinal flaps connected to a spiral-welded coil. The recommended pipes can be used, for example, in ventilation systems.

GB 2 213 748 discloses an apparatus for producing a spirally wound coiled seam tube which, with conveyor rollers, feeds a metal strip into its forming head and therein forms a coiled coiled seam tube with flange rollers associated with the forming head. An apparatus for producing a helically wound tube is also described in GB 1 168 178. The technology used in this and the foregoing apparatus is well known to those skilled in the art and, moreover, many apparatuses of similar operation are commercially available, but all of the apparatuses or processes known to us have some inherent shortcomings.

In the production of corrugated welded tubes of known design, the corrugated weld is prone and slippery, resulting in an unintentional change in tube diameter. In order to solve this problem, pressure in the forming rollers formed in the forming head is generally increased. However, this increased flange roll pressure can damage the creased seam as well as the edges of the metal strip forming the tube, so adjusting or adjusting the pressure of the flange roller 50 is considered an important factor in the quality of the resulting tube and seam weld.

In addition to the rim roller pressure that creates a seamy weld, the operator must also consider several other parameters, such as the thickness of the metal strip forming the tube, the lubrication of the metal strip during manufacture, and the wear of certain production equipment over time, e.g. . Accordingly, there are very high professional requirements for the payroll operator.

Even with the expertise of the person operating the equipment, it is very difficult to prevent the welded seam from slipping or slipping. An unplanned increase in the diameter of the tube produced may occur either during manufacture immediately after the forming head or during storage, handling or transport. Of course, the diameter of the tube may also be reduced due to slippage at the corrugated seam, for example, when the tubes are subjected to some external force.

Changing the pipe diameter is always a problem because the pipes that are designed and delivered do not meet the specifications given by the client or meet the pipe's requirements.

Separate problems may arise if the pipes thus made are used in ventilation ducts installed at different locations. For example, vibrations caused by fans and similar devices can cause the weld to slip, causing unwanted air leakage and pressure drop. In more severe cases, slitting or sliding the ventilation duct pipes along the grooved seams may jeopardize the safe operation of the entire ventilation system.

In ventilation duct systems, helical coiled tubes, which are the main part of the systems, are joined by various fittings. Such fittings include pipe bends, T-fittings, silencers, silencers, etc. These fittings are usually mounted at the ends of the pipes and secure sealing is provided by a sealing ring located in the connection area of the fitting. If, however, the pipe is unintentionally widened, i.e. its diameter is increased, there is a risk that proper sealing between the valve and the pipe can no longer be maintained.

This can lead to the aforementioned air leakage and pressure drop problems, resulting in energy loss and increased operating costs.

In other cases, the fittings do not have a separate pre-installed gasket, but the gap between the fitting outer boundary surface and the inner wall of the tube is filled with a mastic for sealing purposes. If this gap becomes too large due to an unwanted increase in pipe diameter, the filled mastic cannot provide a satisfactory seal. Even with increased pipe diameters, problems may arise later when sufficient mastic is safely metered, because vibrations, air pressure peaks, and so on. the fittings can be moved out of position.

It is also disadvantageous to increase the diameter of the pipe even in cases when the outer surface of the pipe has to be pre-fabricated, i.e. knitted ring-shaped or fastening elements, fittings, because in such cases the larger diameter pipe cannot be connected.

It is therefore an object of the present invention to provide a method and apparatus for providing known solutions

EN 223 347 ΒΙ can be eliminated and threaded coiled suture tubes can be formed without the risk of the coiled suture slipping or slipping or with minimal risk.

It is a further object of the present invention to provide a method and apparatus for maintaining the diameter of fabricated and coiled sutured sutures at their nominal nominal value during storage, handling, transport, movement and final assembly of the tubes.

It is a particular object of the present invention to provide a process and apparatus that can be easily adapted to existing production equipment.

In order to solve this problem, we have followed a process for forming a helical sewing tube from a metal strip having longitudinal edges by leading the metal strip to a forming head, then forming a helical strip and connecting the metal strips of the metal strip to the helix flattening the tube formed in the forming head into a helical suture, and then threading the coiled sutured tube out of the forming head. This has been further developed in accordance with the present invention by providing spaced-apart locking deformations on the creased seam to permanently seal the bonding edges of the metal strip within the creased seam by enlarging and fitting these locking deformations along the creased seam.

According to a preferred embodiment of the method according to the invention, the locking deformations are formed in an operation associated with the forming operations with the forming head.

According to a further preferred embodiment of the method according to the invention, at least one locking deformation is formed on each thread of the seam welded.

It is also advantageous for the invention to provide locking deformations transverse to the creased seam.

The present invention is further based on a device for forming a helically-wound, corrugated sewing tube from a metal strip having longitudinal edges, a unit for coiling and coiling the metal strip into a forming head, the interconnected edges of the metal strip comprising a helical seam flange unit passing through the tube formed in the forming head and a spiral sewing tube extending from the forming head through the helical seam tube. This is further developed in accordance with the present invention by means of detecting means for locating the device in an interlocking manner, interlocking the locking edges of the metal strip in a non-moving, enlarged and interlocking section within the creased seam, spaced apart.

According to a preferred embodiment of the device according to the invention, the locking deformation means comprise a pivotally mounted flange roller and a pivotally mounted roller roller, the point of contact of which rolls over each other by the metal strip defining at least one of the its surface has a deformation at the flanged joint at the flange point that creates a locking deformation.

According to a further preferred embodiment of the device according to the invention there is provided a groove running along the periphery of the flange roller, which has at least one recess forming a locking deformation on the toothed seam.

It is also advantageous according to the invention if the recess extends perpendicular to the groove of the rim roller.

It is further preferred that the flange roller is disposed outside the formed pipe and the counter roller is disposed within the formed pipe.

In addition, it is advantageous for the rim roller and the roller wheel to have an axis supported by the forming head.

It is also preferred according to the invention to include a pressure member which determines the amount of flange pressure between the flange roller and the counter roller.

It is further preferred that the means for creating deformation of the seamy joint is associated with the forming head.

The object of the present invention is further based on a spiral-wound suture tube coiled from a metal strip with longitudinal edges coupled to a helical suture which, in accordance with the present invention, includes the associated edges of the coiled suture without interlocking the bonding edges of the metal strip.

According to a preferred embodiment of the tube according to the invention, the threaded seam comprises at least one locking deformation on each thread of the seam.

In another preferred embodiment of the tube according to the invention, the locking deformations extend transversely to the corrugated seam.

The main advantage of the proposed solution is that the locking deformations formed on the corrugated seam directly indicate that the tube in question has a permanent corrugated seam in which the pipe diameter cannot be changed, and it is advantageous that these locking deformations either in new equipment or in existing equipment can be created by simple modifications.

The invention will now be described in more detail with reference to the accompanying drawings, in which an exemplary embodiment of the apparatus implementing the proposed process is illustrated. In the drawing it is

Fig. 1 is a schematic diagram of a device for forming a spirally wound sutured tube;

HU 223 347 Bl

Figure 2 is a schematic view of a flange assembly formed in the apparatus of the present invention;

Figure 3 shows a detail of a coiled coiled pipe formed by an apparatus according to the invention,

Fig. 4 is an enlarged detail showing the highlighted part of Fig. 3

Fig. 5 is an enlarged schematic cross-sectional view of a marked portion of the seam welded in Fig. 3;

Figure 6 is a detail view of a rim roller according to the invention, a

Figure 7 shows a depression of the rim roller of Figure 6, a

Figure 8 is a side view of the rim roller of Figure 6, a

Fig. 9 is a sectional view of the rim roller of Fig. 6 with a serrated seam symbolically depicted in a dotted line;

FIG.

Figure 11 is a cross-rib of the rim roller of Figure 10, a

Figure 12 is a side view of a detail of the rim roller of Figure 10, a

Fig. 13 is a sectional view of a portion of the rim roller of Fig. 10, in which the notched seam,

Fig. 14 is a detail of a coiled coiled tube made with a flanged roller of Fig. 10,

Figure 15 is a larger detail of the marked portion of Figure 14, a

Fig. 16 is a sectional view of the seam of Fig. 14 in larger scale,

Fig. 17 is a sectional view of a corrugated seam formed in accordance with another embodiment of the present invention, and

18-22. Figures 1 to 5 show further cross-sections of the seam formed in accordance with the present invention.

The process according to the invention, as well as the apparatus implementing it, can theoretically be used in a production line of the type shown schematically in FIG. This production line or device is substantially the same as that described in detail in GB-A-2 213 748, but some new features of the invention are shown. The metal strip 12 is conveyed by the conveyor rollers 11 to the forming head 14 in the direction of the arrow. The longitudinal edges 16 of the metal strip 12 can be preformed into rolls 13 in a manner known per se. In the forming head 14, the metal strip 12 is wound in a helical fashion, whereby the longitudinal edges 16 of the metal strip 12 are brought into contact with each other. The flange assembly 17, 22, 23, 24 associated with the forming head 14,

It comprises flange rollers 18,19 which, by flanging the interconnected longitudinal edges 16 of the metal strip 12, form a helical seam 25 of the helically wound tube 15. During manufacture, the tube 15 is removed from the forming head 14 in the direction of arrow B by utilizing the feed energy of the metal strip 12. The tube 15 is cut to the required length using a cutting device not shown in the drawing but known to the person skilled in the art.

The apparatus shown in Figure 1 may be further improved by the flange structure shown in more detail in Figure 2. The illustrated flange assembly may be located in the forming head 14 or in a manner related thereto on the production line. According to a first possible embodiment, the flange mechanism has a flange roller 30 including a shaft 31 pivotally mounted in the bearings 32 schematically indicated (see also Figure 1). In the bearings shown schematically in the figure, a roller 34 having a pivotally mounted shaft 35 is also mounted on the forming head 14 inside the tube 33. The tapered seam 37 of tube 33 is flanged between flange roll 30 and roll roll 34. The flange pressure can be adjusted by the pressure element 38 schematically indicated in the drawing, which acts in the direction of the arrow shown on the axis 31 of the flange roller 30.

The circumferential roller 30 has a circumferential groove 39 in which at least one transverse recess 40 is formed (see Figures 6-9). At the point of flange between flange roller 30 and counter roller 34, this recess 40 generates locking deformations 41 in the resulting seam weld 37. The locking deformations 41 are spaced apart at defined intervals along the helical seam 37 in the helix. The flange roller 30, counter roller 34 and recess 40 are thus used as deformation means in the proposed solution.

The apparatus shown schematically in Figure 2 works as follows. The metal strip 12 having longitudinal edges 16, which may have been preformed, for example, by the rollers 13 shown in Figure 1, is formed in the forming head 14. In order to prevent the creased seam from slipping on one another, the preformed edges 16 of the metal strip 12 are deformed at some points by the locking deformations 41 formed by the recesses 40 of the flange roller 30. In the first embodiment shown in Figure 2, the locking deformations 41 consist of enlarged sections of the seam 37. In this way, the edges 16 are secured to each other through the crimped seam 37, thereby obtaining a tube 33 of constant diameter and avoiding the crimped seam 37 from sliding over one another.

An important advantage of the feature of the present invention that the locking deformations 41 are formed by enlarged portions of the seam weld 37 itself is that the locking deformation 41

The wear of the flanges forming the variations can be kept to a very low value compared to the known equipment for producing helical coiled sewing tubes.

Such a locking deformation 41 is shown in FIG. 4 and a possible cross section of a seam 37 is provided

Figure 5 is an enlarged drawing.

The recess 40 of the flange roller 30 used in the first embodiment of the device according to the invention is described in more detail in FIGS. 4 to 8. It can be seen that the recess 40 is wider than the groove 39 relative to the thickness of the flange roll 30. Figure 9 is a sectional view showing a locking deformation 41 in the recess 40 resulting from deformation of the toothed seam 37.

Of course, the locking deformations 41 of the seam weld 37 can be induced in other ways. Another embodiment of the rim rollers 30 is illustrated in FIGS. Figures 3 to 5 are shown. In this configuration, the groove is not provided with a recess 40, but with a transverse rib 42. At the flange point between the flange roller 30 and the counter roller 34 (see Figure 2), this transverse rib 42 is pressed into the toothed seam 37 to create an impression that produces the desired effect. The cross rib 42 may be as wide as the groove 39.

Fig. 13 is a sectional view showing how the locking deformation 43 of the seam 37 is formed in the groove 39 of the flange roller 30. By the way, the crotch seam 37 completely fills the recess of the flange roller 30, so that the transverse rib 42 protruding therefrom gives a strong impression on the crotch seam 37.

Fig. 14 shows a tube 33 having locking deformations 43 formed by a flange roll 30 of a further possible embodiment at a defined distance on the seam 37. Figure 15 illustrates such a locking deformation 43 in greater detail. The locking deformation 43 should be so deep as to provide sufficient locking for the corrugated seam 37 between two adjacent threads of tube 33.

In the two embodiments shown, a single locking deformation 41,43 is provided on each thread of the seam 37, but more than one locking deformation 41,43 may be provided on each of the seam threads 37 if greater closure is required.

Unlike the locking deformations 41,43 described above, the longitudinal edges 16 of the metal strip 12 may also be provided with notches 45 which are clamped together by the flanging operation to form the seam 37. This embodiment is schematically shown in section of Figure 17. The notches 45 on the edges 16 of the metal strip 12 are formed by the dashed line 46 in FIG. 17. The notching itself is preferably carried out as a preforming operation, for example by means of the rollers 13 shown in Fig. 1, which may be formed as a roller roll if necessary.

Further examples of the creased seams of the present invention are shown in Figures 18-22. FIGS. In this case, for example, a flexible strip 47 made of rubber is clamped into the corrugated seam 37. By properly adjusting the flange compression force, the strip 47 acts as a friction enhancer between the engaging edges 16 of the metal strip 12 and thereby prevents them from slipping on one another. As can be seen, the compressed flexible ribbon 47 may be arranged at various locations between the bent edges 16.

As the strip 47 runs along the entire length of the seam 37, it also provides a very good sealing effect. The ribbon 47 is positioned with the forming head 14 in the notched seam 37 and is preferably fed from the bobbin 48 mounted on the apparatus. The 48 bobbins are sketchy

Also shown in Figure 1.

Due to the friction-enhancing effect of the strip 47, it is possible to prevent slippery seams 37 from slipping while providing a very good seal between the individual threads. Preferably, the ribbon 47 has a circular cross-section prior to insertion into the notched suture 37 and compresses it to form the ribbon shown in the figures.

Of course, the insertion of the belt 47 can also be combined with the formation of the locking deformations 41, 43, i.e. the use of the flange roller 30 and the counter roller 34.

In accordance with the flange roll arrangement 30 shown above, the flange roll 30 is located outside the pipe 15, 33 while the counter roll 34 is disposed inside the pipe 15, 33. Of course, the desired effect is obtained also by reversing the position of the two said elements and placing the counter roller 34 outside the pipe 15,33 and placing the rim roller 30 inside the pipe 15,33. The structural solutions used to create the locking deformations 41, 43, such as the recess 40 or the cross rib 42, may be formed on the flanged seam 37 on either the flange roll 30 or the roll roll 34. In addition, more than one recess 40 and / or transverse rib 40 may be formed on the flange roller 30 or counter roller 34, but is only important to provide the desired locking deformation effect.

It will be apparent to those skilled in the art that the two illustrated rim rollers may be combined in such a way that both the recess or recesses 40 and the cross ribs or ribs 42 are formed on the rim roller 30 and / or the counter roll 34.

Claims (15)

1. A method of forming a helical coiled sewing tube from a metal strip having longitudinal edges, wherein the metal strip is led to a forming head, therethrough is formed into a helical shape, and the edges of the helically wound metal strip are connected to each other, and fluted into a fluted suture, then a coiled sutured tube from the forming head Characterized in that spaced-apart locking deformations (41) are provided on the creased seam (37) to permanently seal the engaging edges (16) of the metal strip (12) within the creased seam (37) such that these locking deformations (41) formed as enlarged and overlapping sections of the seam (37). Method according to claim 1, characterized in that the locking deformations (41) are formed in an operation associated with the forming operations with the forming head (14). Method according to claim 1 or 2, characterized in that at least one locking deformation (41) is formed on each threaded thread (37). 4. Method according to any one of claims 1 to 4, characterized in that the locking deformations (41) are formed transversely to the creased seam (37). 5. An apparatus for forming a spirally wound, corrugated seam tube made of a metal strip having longitudinal edges, the apparatus further comprising a unit for leading the metal strip to the forming head, and for wounding the edges of the metal strip in a helical winding comprising a helical seam flange unit passing through the tube and a helical seam tube extending from the molding head, characterized in that the engaging edges (16) of the metal strip (12) are fixedly disposed within the seam (37); ) are provided with locking deformations (41) spaced apart and spaced apart to form interlocking deformations (30, 34, 40) spaced apart on the corrugated seam (37) seeing. Apparatus according to claim 5, characterized in that the means (30, 34, 40) for forming the locking deformation (41) comprises a pivotally mounted flange roller (30) and a pivotally mounted counter roller (34) which intervene with the metal strip (12). the point of contact of its roll-over surfaces defining a flange forming a fluted joint (37), and a deformation at the flange of the flute weld (37) forming a locking deformation (41) at the flange at the flange of the at least one of . Apparatus according to claim 6, characterized in that the rim roller (30) comprises a groove (39) extending along the periphery of the rim roller (30), which comprises at least one recess (40) forming a locking deformation (41) on the toothed seam (37). Apparatus according to claim 7, characterized in that the recess (40) extends perpendicular to the groove (39) of the rim roller (30). 9. A 6-8. Apparatus according to any one of claims 1 to 3, characterized in that the flange roller (30) is arranged outside the formed pipe (33) and the counter roller (34) is arranged inside the formed pipe (33). 10. A 6-9. Apparatus according to any one of claims 1 to 4, characterized in that the flange roller (30) and the counter roller (34) have an axis (31, 35) supported by the forming head (14). 11. Apparatus according to any one of claims 1 to 3, characterized in that it comprises a pressure element (38) for determining the amount of flange pressure between the flange roller (30) and the counter roller (34). 12. Apparatus according to any one of claims 1 to 3, characterized in that the means (30, 34,45) for deforming the creased seam (37) are associated with the forming head (14). 13. A spirally wound tubular coil with longitudinal edges coupled to a helical coil, characterized in that the coiled seam coiled in the helical seam (37), without interrupting the deformation of the associated edges (16) within the coiled seam (37). contain. Pipe according to claim 13, characterized in that at least one locking deformation (41) is provided on each of the threaded threads of the corrugated seam (37). Pipe according to claim 13 or 14, characterized in that the locking deformations (41) extend transversely to the corrugated seam (37). HU 223 347 Bl Int Cl ⁷ : B 21 D 15/04 Figure 1% HU 223 347 Bl Int CIJ: B 21 D 15/04 Figure 2 HU 223 347 Bl Int Cl ⁷ : B 21 D 15/04 Figure 5 HU 223 347 Bl Int Cl ⁷ : B 21 D 15/04 Figure 6 Figure 7 Figure 9 HU 223 347 Bl Int CIJ: B 21 D 15/04 Figure 11 Figure 10 Figure 13 HU 223 347 Bl Int Cl ⁷ : B 21 D 15/04 HU 223 347 Bl Int Cl ⁷ : B 21 D 15/04 Figure 18 47 37 Figure 19 I7 ~ z / -ΓΎ / / -V / T \ \ \ \ X ML / / / / ' Figure 20 Figure 21 Figure 22