EP3814020B1 - Carrying device for receiving a pipeline element, associated transport system, and production method - Google Patents

Description

The present invention relates to a carrying device for receiving pipeline elements in a surface coating system, with a base body, a coupling section formed on the base body for coupling the carrying device with a ceiling-side conveyor mechanism, and a plurality of arms extending laterally from the base body. The invention further relates to a system for transporting at least one pipeline element within a surface coating system, with a ceiling-side conveyor mechanism, and at least two carrying devices that can be coupled to the conveyor mechanism for receiving pipeline elements. In a further aspect, the invention relates to a method for producing a coated pipeline element, in particular a pipeline element of a fire extinguishing system, and such a pipeline element.

Carrying devices for holding pipeline elements in a surface coating system are well known. Typically, the carrying devices are designed with the aim of holding pipes in such a way that a complete external pipe coating is possible.

Piping elements that are to be used in fire extinguishing systems face special challenges in that they are installed unused in objects for very long periods of time and are reliably used when they are used The task of fluid transport must be ensured. Fire extinguishing systems are widely used, for example, in which the pipe systems carry extinguishing fluid even in the standby state and, alternatively, those in which the sprinkler pipes do not carry any extinguishing fluid in the standby state. In the latter systems, the susceptibility to corrosion inside the pipes is a particular challenge, which is why efforts have been made to reduce the corrosion resistance of pipe elements, particularly for fire extinguishing systems.

In US 2009/194422 , EP 1 2153 964 and EP 2 766 653 systems and methods are described that achieve a significant improvement over the state of the art. There, the use of polymer finishing by means of autodeposition on the inside of pipes in pipe elements of fire extinguishing systems is described for the first time. The polymer refinement described there is extremely robust due to the ionic bonding of a polymer-based coating material to the pipe surface and makes it possible to use simple metals that are not yet corrosion-resistant per se, in particular low-alloy steel types. At the same time, very little corrosion development and even complete corrosion resistance are achieved, even over longer observation periods.

However, the industrial coating of the inside of pipes currently represents a particular challenge. It has been shown that carrying devices known from the prior art, which are used to move pipe elements in surface coating systems to different processing or coating positions, ensure a uniform coating of the inside of the pipe stand in the way.

Carrying devices known from the prior art have holding means which are inserted at least in sections into the interior of the pipe in order to enable a complete external coating of pipe elements. However, this means that in the area of contact with a pipe element on the inside of the pipe, only insufficient coating can be applied and pipes that have been held with such support devices have areas on the inside of the pipe that are susceptible to corrosion.

Against this background, the invention was based on the object of developing a carrying device of the type mentioned in such a way that the disadvantages found in the prior art are eliminated as largely as possible. There was one in particular Specify a carrying device that ensures a secure hold of pipeline elements and at the same time enables improved coating.

According to the invention, the object is achieved in a carrying device of the type mentioned in that a receptacle with support feet arranged in pairs and spaced apart from one another is arranged on each boom, the support feet being set up to come into contact with an outer wall section of a pipeline element in order to to hold the pipeline element between the support feet.

The invention is based on the knowledge that by means of such a carrying device with support feet arranged in pairs and spaced apart from one another, it can be ensured on the one hand that a pipeline element can be securely held by such a device and that the pipeline element experiences a certain centering, so to speak, and at the same time it is ensured that that the inside of the pipeline elements can flow freely around and the outside is only in contact with the carrying device at limited, punctual surface sections.

This advantageously makes it possible for a pipeline element to remain on the carrying device during the entire coating process, i.e. during the course of different coating steps, and, for example, to be immersed in different coating baths together with the carrying device. This not only ensures a high coating quality overall, primarily on the inside, but at the same time provides a possibility of efficiently transporting pipeline elements within a surface coating system without having to separate such a pipeline element from the carrying device. Furthermore, after the end of a coating process and after the pipeline elements have been removed from the carrying device, the carrying device can be easily separated from a ceiling-side conveyor mechanism and then freed from the coating layer or stripped of paint.

The invention is further developed in that the supporting feet arranged in pairs are aligned facing each other at an angle of 35° to 95°, preferably 60° to 75°, more preferably 62° to 72°, particularly preferably 64° to 70°. It has proven to be advantageous to use an angle between 60° and 75° or one of the narrower ranges for pipes of type DN150 and DN200, with the support angle for pipes of type DN150 being preferably larger than for pipes of type DN200. For big For pipes such as DN250 or DN300, it has been found to be advantageous to use an angle of 83° and 95°, preferably 85° to 90°. According to an alternative embodiment, which is intended in particular for pipes of type DN100 or DN125, the supporting feet arranged in pairs are preferably aligned facing each other at an angle in the range of 45° to 55°, particularly preferably in the range of 48° to 52°.

It has been shown that an alignment of the support feet in the relevant angular range relative to one another for different pipe element diameters is advantageously suitable for securely receiving the pipe elements and centering them between the support feet. The risk that one of the pipeline elements slips from the carrying device while the same is being moved using the carrying device according to the invention can be minimized by appropriately aligning the support feet to one another.

According to a preferred embodiment, the support feet arranged in pairs have a height at their end facing away from the boom compared to the top of the boom of 30 mm to 80 mm, in particular 47 mm to 77 mm.

For the height range in question, it has been shown for a large number of pipeline elements that a coating fluid can flow around them safely, even in the area of the support feet, and thus a high coating quality can be ensured in the area of the contact area between the support feet and the pipe element. Even in the event that - for example in the case of powder coating - either the powder or the pipeline element experiences a static charge, the support feet, in conjunction with the relevant height of the support feet, can ensure that coating powder is applied evenly and largely undisturbed to the pipeline element can arrange.

Furthermore, it is preferred that the support feet each have a holding tip with a blunt side and a pointed side, the holding tip having a larger diameter on the stump side than on the pointed side.

First of all, the stump side, which has a larger diameter, serves to provide basic strength and secure connection to the boom. A smaller diameter of the holding tip in the area of the tip side facing a pipeline element has proven to be advantageous for the contact surface of the pipeline element with the holding tip to ensure that the coating is only affected by the holding tip in a very limited outer wall section.

The invention is further developed in that the holding tip has a coupling recess on the stump side and a plug section corresponding to the coupling recess is formed on a base section of the support feet. In this way, the holding tip and the base section of the support feet can be permanently connected.

According to a preferred embodiment, the holding tip has a cylindrical section and a conical section adjacent to the cylindrical section, the conical section, in particular its cone tip, being designed to come into contact with a pipeline element. The relevant component geometry of the holding tip has proven to be sufficiently strong and stiff, but at the same time only minimally disrupts the flow around the pipeline element.

The invention is further developed in that the holding tip is designed as a separate, replaceable component. Thus, on the one hand, the holding tip can be made of a material that differs from the boom, and at the same time, the component that is most likely to be subject to wear due to direct contact with a pipeline element can be replaced. Removing coatings or stripping paint from the holding tips can also be carried out more easily and economically if they can be removed from the boom.

The holding tip is preferably made of one of the following materials: free-cutting steel, in particular 9SMn28K, non-ferrous metal. Depending on the area of application with regard to the coating process to be used or also with regard to the pipe element material to be held, the holding tip can preferably be made of one of the materials mentioned. Furthermore, it is preferred that the holding tip has a coating made of a hard metal or ceramic.

According to a preferred development, the base body and/or the boom are partially or completely formed from one of the following: sheet metal, in particular one-piece sheet metal, non-ferrous metal. The material selection for the base body and/or the boom can also be made taking into account the coating process to get voted. For example, the construction of the base body and boom made of sheet metal can be advantageous in order to introduce static charges into a pipeline element via the base body and boom. For other applications, designing the components from a non-conductive material can be advantageous. The design of the base body as a one-piece component has also proven to be advantageous in terms of component durability.

The invention is further developed in that at least two cantilevers are arranged on the base body at a distance from one another along a longitudinal axis of the base body. In other words, it is preferred that two or more booms are arranged one above the other at a distance during operation. This results in the advantage that several pipeline elements can be transported and coated using a single carrying device or by means of a combination of two carrying devices.

Preferably, the distance between an upper side of a first boom and the underside of an adjacently arranged second boom is 100 mm to 500 mm, in particular 130 mm to 435 mm.

This ensures that the pipeline elements can be flowed around in an omnidirectional manner in an optimal manner during a coating process and it is ensured that no disruption to the coating quality occurs due to adjacent booms with pipeline elements arranged thereon. A relevant spacing of the cantilevers from one another has also proven to be advantageous in enabling optimal thermal post-treatment.

Furthermore, the booms have a substantially horizontal orientation during operation according to a preferred embodiment. The state "in operation" is defined in the context of the present application as the position in which the carrying device is coupled to a ceiling-side conveyor mechanism, and the base body has a substantially vertical orientation and the booms have a substantially horizontal orientation. The term “essentially” is to be understood here as deviations from the reference horizontal or vertical of ±10°.

According to a preferred embodiment, the boom has a first side and a second side, the booms on the first side being arranged aligned or offset from the booms on the second side.

First of all, the arrangement of booms on the first side and on the second side has fundamental static advantages, since when both sides of the boom are evenly equipped with the same pipeline elements, forces are prevented from being introduced into the ceiling-side conveyor mechanism on one side via the boom and base body.

A non-aligned, offset arrangement offers the advantage that the distance between pipe elements arranged on the first side and the second side can be increased due to the offset arrangement, whereby improved flow conditions around the pipe elements are achieved depending on the type of coating and also depending on the pipe element diameter can. Depending on the pipe element diameter, the carrying device can possibly be designed to be more compact with an offset arrangement of the arms on the first and second sides.

The invention has been described above with reference to a carrying device. In a further aspect, the invention relates to a system for transporting at least one pipeline element within a surface coating system, with a ceiling-side conveyor mechanism, and at least two carrying devices that can be coupled to the conveyor mechanism for receiving pipeline elements.

The invention solves the problem described at the outset in relation to the system described at the outset, in which the carrying devices attack the same pipe element at a distance from one another and are designed according to one of the exemplary embodiments mentioned above.

The system makes use of the same advantages and preferred embodiments as the carrying device according to the invention. In this regard, reference is made to the above statements and their content is included here.

In a further aspect, the invention relates to a method for producing a coated pipeline element, in particular a pipeline element of a fire extinguishing system.

The invention solves the problem described at the outset in relation to the method by the steps: providing a pipeline element to be coated, placing the pipeline element on two supporting devices coupled to a ceiling-side conveying mechanism, at least one of the supporting devices being designed according to one of the above-mentioned exemplary embodiments, conveying the Pipe element by means of the conveyor mechanism to a coating device, and coating the pipe element in the coating device.

The method also makes use of the same advantages and preferred embodiments as the carrying device according to the invention and reference is made again to the above statements and their content is included here. A further advantage of the method is that the pipeline element only has to be placed on the support devices once and can then remain on the support devices during coating. The conveying mechanism with the carrying devices thus serves to transport a pipeline element between different coating stations, but at the same time also serves as a holder and guide for the pipeline element during the individual coating steps. In summary, a highly automated coating process for pipeline elements can be implemented, in which pipeline elements only have to be applied once to a support device and can then be coated fully automatically and without further position changes.

The method is further developed in that the coating is carried out using a polymer coating process, wherein the pipe element remains on the support device during the coating and the pipe element is preferably inclined relative to a horizontal during the coating.

The coating is preferably carried out in particular by means of chemical autodeposition, preferably by immersing the pipeline element in an immersion bath which contains a polymer-based chemical autodeposition material.

The autodeposition material preferably contains polymeric components which are ionically bound to the wall of the pipeline elements and is preferably in the form of an aqueous emulsion or dispersion.

The autodeposition material is preferably acidic in its liquid phase, particularly preferably it has a pH in a range from 1 to 5, and especially preferably a starter material in the form of metal halides. Iron halides in particular are suggested as metal halides for iron-containing metals, particularly preferably iron(III) fluoride. Zinc halides in particular are suggested as metal halides for zinc-containing metals.

By means of a reaction on the surface of the pipeline elements, the metal halides release metal ions, in the case of an iron-containing pipeline element, in particular iron ions, in particular Fe2+ ions, or in the case of a zinc-containing pipeline element, in particular zinc ions, which destabilize the polymeric components in the autodeposition material, as a result of which an accumulation occurs the metal surface of the pipeline elements.

• i) Epoxiden,
• ii) Acrylaten,
• iii) Styroacrylaten,
• iv) Epoxyacrylaten,
• v) Isocyanaten, insbesondere Urethanen, wie etwa Polyurethanen,
• vi) Polymere mit Vinylgruppe, beispielsweise Polyvinylidenchlorid, oder
• iv) eine Kombination aus zwei oder mehr von i), ii) oder iii), die vorzugsweise miteinander querverbunden sind, weiter vorzugsweise über ein Isocyanat, besonders bevorzugt über ein Urethan.

The autodeposition material preferably has autodepositionable polymers as the polymeric component, preferably selected from the list consisting of:

• i) epoxies,
• ii) acrylates,
• iii) styroacrylates,
• iv) epoxy acrylates,
• v) isocyanates, especially urethanes, such as polyurethanes,
• vi) polymers with vinyl groups, for example polyvinylidene chloride, or
• iv) a combination of two or more of i), ii) or iii), which are preferably cross-linked to one another, more preferably via an isocyanate, particularly preferably via a urethane.

In the method according to the invention, the dipping step is continued in one or more dips until the polymer-based layer attached to the inside of the pipe element has a thickness in a range from 7 μm to 80 μm, preferably a thickness in a range from 7 μm to 30 µm. The aforementioned values relate to the dry layer thickness and in particular to an increase in thickness relative to the uncoated state.

Alternatively or in addition to the polymer finishing described above, the coating in a preferred embodiment comprises a powder coating process, wherein the pipeline element remains on the support device during the coating. Both polymer finishing and powder coating should be used are carried out, the powder coating is preferably carried out after the polymer-based layer has been applied, without having to remove the pipeline elements from the carrying device in the meantime. It is further preferred that the pipeline element is subjected to at least partial thermal aftertreatment after the surface coating has been applied. According to a first alternative embodiment, it is preferred that powders intended for coating be electrostatically charged before and/or during coating. The adhesion of the powder to the workpiece to be coated, in particular the pipeline element, can be positively influenced in this way without electrodes, etc., having to be attached to the element to be coated.

According to a second preferred embodiment, the pipeline element intended for coating is electrostatically charged before and/or during coating. For some pipeline element materials, such a procedure has proven to be advantageous in order to ensure a uniform and high-quality coating, especially inside a pipeline element.

In a further aspect, which is not part of the invention, a pipeline element is described, in particular produced in a method according to one of the preferred embodiments described above, with a first end region and an oppositely arranged second end region, with a wall with an inner surface and a outer surface, a surface coating on the outer surface. The pipeline element has two uncoated sections arranged in the area of the ends of the wall on the outer surface.

This shows that, in comparison to previously known systems, the exemplary embodiment provides pipeline elements in which the surface area could be reduced to only 4 essentially punctiform uncoated areas. In particular, the inside of the pipeline element remains free of such defects.

According to an alternative embodiment, two of the uncoated sections are preferably arranged along a circumference of the pipeline element at an angle of 35° to 95°, preferably 60° to 75°, more preferably 62° to 72°, particularly preferably 64° to 70° to one another . It has proven to be advantageous to use an angle between 60° and 75° or one of the narrower ranges for pipes of type DN150 and DN200, with the support angle for pipes of type DN150 being preferably larger than for pipes of type DN200. For large pipes, such as type DN250 or DN300, it has been found advantageous to use an angle of 83° and 95°, preferably 85° to 90°.

According to a further alternative embodiment, which is intended in particular for pipes of type DN100 or DN125, two of the uncoated sections are preferably along the circumference of the pipeline element at an angle of 45° to 55°, particularly preferably at an angle of 48° to 52° , arranged spaced apart from each other.

Furthermore, it is preferred that a surface coating is arranged on the inner surface.

According to a further preferred embodiment, the surface coating is designed as a polymer coating on the inner and outer surfaces.

Furthermore, it is preferred that the surface coating on the outer surface has a powder coating in addition to the polymer-based layer or is designed as a powder coating.

In a further preferred embodiment, the pipeline element is made of a metal suitable for chemical autodeposition, in particular an iron-containing and/or zinc-containing metal, and the polymer-based layer contains a metallic component, preferably in the form of metal ions, in the case of an iron-containing metal, particularly preferably in the form of iron ions and in the case of a metal containing zinc in the form of zinc ions.

• i) Epoxiden,
• ii) Acrylaten,
• iii) Styroacrylaten,
• iv) Epoxyacrylaten,
• v) Isocyanaten, insbesondere Urethanen, wie etwa Polyurethanen,
• vi) Polymere mit Vinylgruppe, beispielsweise Polyvinylidenchlorid, oder
• iv) eine Kombination aus zwei oder mehr von i), ii) oder iii), die vorzugsweise miteinander querverbunden sind, weiter vorzugsweise über ein Isocyanat, besonders bevorzugt über ein Urethan.

Further preferably, the polymer-based layer has polymeric components, preferably selected from the list consisting of:

• i) epoxies,
• ii) acrylates,
• iii) styroacrylates,
• iv) epoxy acrylates,
• v) isocyanates, especially urethanes, such as polyurethanes,
• vi) polymers with vinyl groups, for example polyvinylidene chloride, or
• iv) a combination of two or more of i), ii) or iii), which are preferably cross-linked to one another, more preferably via an isocyanate, particularly preferably via a urethane.

In a further preferred embodiment, the polymer-based layer has a thickness in a range from 7 μm to 80 μm, preferably a thickness in a range from 7 μm to 30 μm. The aforementioned values relate to the dry layer thickness and in particular to an increase in pipe thickness relative to the uncoated state.

Furthermore, it is preferred that the pipeline element has a nominal diameter in a range from DN15 to DN300, preferably DN 32 to DN 80. Alternatively, the nominal diameter ranges in the inch system are from ½" (NPS) to 12" (NPS), particularly preferably in a range from 1 ¼" (NPS) to 3" (NPS).

The pipeline element preferably has a longitudinal axis and a pipe length in the direction of the longitudinal axis in a range of 1 m or more, more preferably in a range of 3 m or more, particularly preferably in a range of 5 m or more.

The invention is described in more detail below with reference to the attached figures and with reference to preferred exemplary embodiments.

Fig. 1

einen Ausschnitt eines ersten Ausführungsbeispiels einer erfindungsgemäßen Tragevorrichtung in einer Seitenansicht;

Fig. 2

das Ausführungsbeispiel der erfindungsgemäßen Tragevorrichtung gemäß Fig. 1 in einer Seitenansicht;

Fig. 3

ein zweites alternatives Ausführungsbeispiel einer erfindungsgemäßen Tragevorrichtung in einer Seitenansicht;

Fig. 4

ein drittes alternatives Ausführungsbeispiel einer erfindungsgemäßen Tragevorrichtung in einer Seitenansicht;

Fig. 5

ein viertes alternatives Ausführungsbeispiel einer erfindungsgemäßen Tragevorrichtung in einer Seitenansicht;

Fig. 6 bis 8

erfindungsgemäße Haltespitzen in Seitenansichten; und

Fig. 9

ein mittels einer Tragevorrichtung gemäß den Figuren 1 bis 8 hergestelltes Rohrleitungselement.

Show here:

Fig. 1

a detail of a first exemplary embodiment of a carrying device according to the invention in a side view;

Fig. 2

the embodiment of the carrying device according to the invention Fig. 1 in a side view;

Fig. 3

a second alternative embodiment of a carrying device according to the invention in a side view;

Fig. 4

a third alternative embodiment of a carrying device according to the invention in a side view;

Fig. 5

a fourth alternative embodiment of a carrying device according to the invention in a side view;

Fig. 6 to 8

Holding tips according to the invention in side views; and

Fig. 9

one by means of a carrying device according to Figures 1 to 8 manufactured pipeline element.

Figure 1 shows an enlarged detailed view of a section of a carrying device 2 according to the invention. The carrying device 2 has a base body 6, which is in the Figure 1 is only partially shown. A boom 8 is arranged on the base body 6. In the present case, the base body 6 extends in a vertical direction during operation, ie in a state in which the carrying device 2 is connected to a ceiling-side conveyor mechanism (not shown), while the boom 8 extends in a horizontal direction in the operating position.

Arranged on the boom 8 is a receptacle 10 for receiving a pipeline element 4. The receptacle 10 has two support feet 12, 12 ', which are aligned facing each other. The angle of inclination at which the support feet 12, 12 'face each other is designated β. The support feet 12, 12' come into contact with wall sections 14, 14' of the pipeline element 4. These wall sections of the pipe element 14, 14' are located on the outside of the pipe element 4. The support feet 12, 12' are designed in two parts. First, a base section of the support feet 24, 24 'is arranged immediately adjacent to the boom 8. The base section of the support feet 24, 24' is designed as a plug section 26, 26' towards its end.

A holding tip 16, 16' can be applied to the plug section 26, 26'. The holding tip 16, 16' in turn has a blunt side 18, 18' and a tip side 20, 20'. A coupling recess 22, 22' is formed in the stump side 18, 18', which corresponds to the plug section 26, 26' of the base section of the support feet 24, 24'. In this way, the holding tip 16, 16 'is arranged interchangeably on the base section of the support feet 24, 24'.

To enable a largely undisturbed flow around the pipe element 4 during a coating process, the pipe element 4 facing section of the holding tip 16, 16 'is spaced from the top of the boom 8 by means of the height h.

In Figure 2 a complete exemplary embodiment of a carrying device 2 is shown. As can be seen from the figure, a total of seven arms 8 are arranged on the base body 6. Starting from the base body 6, the arms 8 extend in one direction. To ensure that the flow around pipe elements 4 that can be arranged on the carrying device 2 is as undisturbed as possible, each adjacent arm 8 has a distance d1. This distance d1 is largely determined by the pipe element diameter for which a carrying device 2 is intended and designed. The figure also shows the basic sections of the support feet 24, 24'.

A coupling section 28 is also formed on the base body 6. This coupling section 28 serves to couple the carrying device 2 with a conveyor device, in particular with a ceiling-side conveyor mechanism.

An alternative embodiment of a carrying device 102 is shown in FIG Figure 3 shown. Once again, the carrying device 102 has a base body 106 on which arms 108 are arranged. In the present case, the carrying device 102 has four arms 108, with adjacent arms 108 being spaced apart by a distance d2. Compared to that in the Figure 2 In the exemplary embodiment shown, the carrying device 102 is designed and provided for larger pipe element diameters. The increased distance d2 between two arms 108 ensures, even with larger pipe element diameters, that air flows around them from all sides as well as possible during a coating process, which is particularly relevant for powder coatings. The booms also have 108 compared to those in the Figure 2 The booms 8 shown have higher material thicknesses in order to accommodate the higher weight of pipeline elements 4 with larger diameters. It should be noted that also in the Figure 3 only the basic sections of the support feet 124, 124 'are shown, but not the corresponding holding supports 116, 116'.

Another alternative embodiment of a carrying device 202 is shown in FIG Figure 4 shown. The carrying device 202 again has a base body 206 on which an arm 208 is arranged. The carrying device 202 is, for example, equipped with a ceiling-side conveyor mechanism via a coupling section 228 connectable. There are support feet 212, 212' on the boom 208. Compared to those in the Figures 2 and 3 shown carrying devices 202 and 102 is the one in the Figure 4 Carrying device 202 shown is suitable for larger pipe element diameters. For this purpose, the boom 208 has a strut 232, and the carrying device 228 is only set up to hold a single pipeline element 4.

Finally, another alternative embodiment of a carrying device 302 is still in Figure 5 shown. Outriggers 308 are arranged on a base body 306, with the outriggers 308 extending in a first direction (in the plane of the drawing, starting from the base body 306 to the right) and in a second direction (starting from the base body 306 to the left). Thus, pipe elements 4 can be applied to the base sections of the support feet 324, 324 'on the arms 308 on both sides of the base body 306 using holding tips (not shown).

In the Figures 6 to 8 Different exemplary embodiments regarding holding tips are shown. Figure 6 first shows holding tips 16, 16 ', which have a blunt side 18 and a tip side 20. Both the stub side 18 and the tip side 20 are cylindrical, with the diameter of the stub side 18 being larger than the diameter of the tip side 20. The holding tip 16 comes into contact with a pipe element 4 (not shown) by means of a contact surface 30. A coupling recess is formed in the stump side 18, which can be designed as a bore, for example. The coupling recess thus defines a socket by means of which the holding tip 16 can be placed on a correspondingly designed plug section 26. The ones in the Figure 6 The tip geometry shown ensures that the contact surface 30 with a pipe element 4 (not shown) is as small as possible and a pipe element 4 can be flowed around in the best possible way, but at the same time the holding tip 16 also ensures the required strength and rigidity due to its geometry.

An alternative embodiment of a retaining tip 116, 116' is shown in FIG Figure 7 shown. The holding tip 116, 116 'again has a blunt side 118 and a tip side 120, with a coupling recess 122 being formed in the blunt side 118. A cone tip 130 is arranged on the tip side 120 adjacent to the tip side 120 and at the end facing away from the truncated side 118. By means of this cone tip 130, the contact surface to a pipeline element 4 (not shown) further reduce without adversely affecting the strength and rigidity of the holding tip 116, 116 '.

A further alternative embodiment of a holding tip 216, 216' initially again has a blunt side 218 with a coupling recess 222 formed therein. The top side 220 is in Figure 8 However, it is designed in the shape of a truncated cone and defines a contact surface 230 on the side facing away from the truncated side 218. In comparison to those in the Figures 6 and 7 Holding tips 16, 16 ', 116, 116' shown in the Figure 8 shown holding tip 216, 216 'has a higher strength and rigidity, and is therefore particularly suitable, for example, for very heavy pipe elements 4, but also minimally influences the flow around a pipe element 4.

Figure 9 shows a pipeline element 4 in a perspective view and in a sectional view. The pipeline element 4 has a first end region 32 and a second end region 34. As can be seen from the sectional view, the tubular element 4 has a polymer coating 38, 38 'on its inside and on its outside. A powder coating 40 is also applied to the outside. Uncoated sections 36, 36', 36", 36"', also referred to as defects, are arranged at the end regions 32, 34. The defects primarily relate to the layer area of the powder coating 40, although the polymer coating 38 'can be formed with a reduced layer thickness in these areas, or at least not be present locally. The position of the uncoated sections 36, 36' corresponds to the angle of inclination at which the support feet 12, 12' face each other and is therefore also designated β.

List of reference symbols used

2

Carrying device

4

Piping element

6

Basic body

8th

boom

10

Recording

12, 12'

Support feet

14, 14'

Wall sections of the pipeline element

16, 16'

holding tip

18, 18'

stump side

20, 20'

Lace page

22, 22'

Coupling recess

24, 24'

Basic section of the support feet

26, 26'

Connector section

28

Coupling section

30

Contact surface

32

First end area

34

Second end area

36, 36', 36", 36‴

uncoated sections

38, 38'

Polymer coating

40

Powder coating

β

Angle between holding tip longitudinal axes

H

Height between end of support feet and top of boom

d1, d2

Boom distance

102

Carrying device

106

Basic body

108

boom

116, 116'

holding tip

118

stump side

120

Lace page

122

Coupling recess

124, 124'

Basic section of the support feet

128

Coupling section

130

cone tip

202

Carrying device

206

Basic body

208

boom

212, 212'

Support feet

216, 216'

holding tip

218

stump side

220

Lace page

222

Coupling recess

228

Coupling section

230

Contact surface

232

Bracing

302

Carrying device

306

Basic body

308

boom

324, 324'

Basic section of the support feet

328

Coupling section

Claims (13)

1. Carrying device (2) for receiving pipeline elements (4) in a surface coating installation, having:

   - a main body (6),

   - an attachment section (28) which is formed on the main body (6) and which serves for the attachment of the carrying device (2) to a ceiling-mounted conveying mechanism, and

   - multiple cantilevers (8) extending laterally from the main body (6),

   characterized in that, on each cantilever (8), there is arranged a receptacle (10) with support feet (12, 12') arranged in pairwise fashion and spaced apart from one another, wherein the support feet (12, 12') are configured to come into contact with in each case one outer wall section of a pipeline element (14) in order to hold the pipeline element (4) between the support feet (12, 12').
2. Carrying device (2) according to Claim 1,

   characterized in that the support feet (12, 12') arranged in pairwise fashion are oriented so as to face toward one another at an angle of 35° to 95°; and/or

   characterized in that the support feet (12, 12') arranged in pairwise fashion have, at their end averted from the cantilever (8), a height of 30 mm to 80 mm, in particular 47 mm to 77 mm, in relation to a top side of the cantilevers (8).
3. Carrying device (2) according to one of the preceding claims,
   characterized in that the support feet (12, 12') have in each case one holding tip (16, 16') with a stump side (18, 18') and a tip side (20, 20'), wherein the holding tip has a greater diameter at the stump side (18, 18') than at the tip side (20, 20').
4. Carrying device (2) according to Claim 3,

   characterized in that the holding tip (16, 16') has a coupling recess (22, 22') at the stump side (18, 18'), and a plug-in portion (26, 26') which corresponds to the coupling recess is formed on a base section (24, 24') of the support feet (12, 12'); and/or

   characterized in that the holding tip (216) has a cylindrical section and has a conical section adjoining the cylindrical section, wherein the conical section, in particular the cone tip thereof, is configured to come into contact with a pipeline element (4); and/or

   characterized in that the holding tip (16, 16') is formed as a separate, exchangeable component; and/or characterized in that the holding tip (16, 16') is formed from one of the following materials:

   - machining steel, in particular 9SMn28K,

   - nonferrous metal.
5. Carrying device (2) according to one of the preceding claims,
   characterized in that the main body (6) and/or the cantilever (8) are formed from one of the following:

   - sheet metal, in particular one-piece sheet metal,

   - nonferrous metal.
6. Carrying device (2) according to one of the preceding claims,

   characterized in that, on the main body (6), at least two cantilevers (8) are arranged spaced apart from one another along a longitudinal axis of the main body (6), wherein preferably

   the cantilevers (8) have a substantially horizontal orientation during operation; and/or

   the cantilever (308) has a first side and a second side, wherein the cantilevers (308) on the first side are arranged in alignment with or so as to be offset with respect to the cantilevers on the second side.
7. System for transporting at least one pipeline element (4) within a surface coating installation, having:

   - a ceiling-mounted conveying mechanism, and

   - at least two carrying devices (2), which are attachable to the conveying mechanism, for receiving pipeline elements (4),

   characterized in that the carrying devices engage, spaced apart from one another, on the same pipeline element (4) in each case, and are designed according to one of Claims 1 to 6.
8. Method for producing a coated pipeline element (4), in particular a pipeline element (4) of a fire extinguishing installation, wherein the method comprises the steps:

   - providing a pipeline element (4) for coating,

   - placing the pipeline element (4) onto two carrying devices (2) which are coupled to a ceiling-mounted conveying mechanism, wherein at least one of the carrying devices (2) is designed according to one of Claims 1 to 6,

   - conveying the pipeline element (4) by means of the conveying mechanism to a coating facility, and

   - coating the pipeline element (4) in the coating facility.
9. Method according to Claim 8,
   characterized in that the coating is performed in a polymer coating process, wherein the pipeline element (4) remains on the carrying devices (2) during the coating process and, preferably, the pipeline element (4) is inclined relative to a horizontal during the coating process.
10. Method according to Claim 9,

    wherein the coating is performed in particular by means of chemical autodeposition, preferably by dipping of the pipeline element (4) into a dip bath which contains a polymer-based chemical autodeposition material; and/or

    the autodeposition material comprises polymer constituents which are ionically bonded to the wall of the pipeline elements (4), and is preferably present as an aqueous emulsion or dispersion; and/or the autodeposition material is acidic, preferably has a pH value in a range from 1 to 5, and preferably comprises a starter material in the form of metal halides; and/or

    the autodeposition material has, as polymer constituent, one or more autodepositionable polymers preferably selected from the list comprising:

    i) epoxides,

    ii) acrylates,

    iii) styrene acrylates,

    iv) epoxy acrylates,

    v) isocyanates, especially urethanes, such as polyurethanes,

    vi) polymers with a vinyl group, for example polyvinylidene chloride, or

    vii) a combination of two or more of i), ii) or iii), which are preferably crosslinked to one another, more preferably via an isocyanate, particularly preferred via a urethane.
11. Method according to Claim 10,
    wherein the dipping step is continued in one or more dipping steps until such time as the polymer-based layer applied to the inside of the pipeline element has a thickness in a range from 7 um to 80 um, preferably a thickness in a range from 7 um to 30 µm.
12. Method according to one of Claims 8 to 11,
    characterized in that the coating comprises a powder coating method, wherein the pipeline element (4) remains on the carrying device (2) during the coating process.
13. Method according to Claim 12,

    characterized in that the pipeline element (4) is subjected to an at least partial thermal aftertreatment before the powder coating process and/or after the powder coating process, wherein, preferably, powder provided for the coating process is electrostatically charged before and/or during the coating process; or

    a pipeline element (4) provided for the coating process is electrostatically charged before and/or during the coating process.

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