DE29823621U1 - Device for the production of pipe insulation elements and pipe insulation element - Google Patents

Description

Device for producing pipe insulation elements and pipe insulation element.

The invention relates to a device for producing pipe insulation elements, in particular pipe shells made of mineral fibers, wherein the mineral fibers are arranged in the usual way in a mineral wool fleece, which forms a primary fleece. Furthermore, the invention relates to a pipe insulation element made of mineral fibers, consisting of a mineral wool fleece, and pipe insulation elements produced with the device.

Pipe insulation elements, namely mineral wool pipe shells with a constant density distribution over the entire cross-section, are known from the state of the art. They are used for heat, cold and/or sound insulation and as fire protection cladding for pipelines. Such pipe insulation elements consist, for example, of two sections with a semicircular cross-section, which, when joined together, accommodate a pipe in their hollow center area. However, other pipe insulation elements are also known, namely those that are made in one piece or consist of a large number of elements in the shape of circular arc sections.

The insulation of pipes is particularly used in building services. In the past, pipes in building services were mainly made of galvanized steel pipes or copper pipes. In the meantime, the use of plastic pipes and pipes made of stainless steel has proven to be particularly advantageous, with copper pipes accounting for 50%, plastic pipes for 35%, galvanized steel pipes for 9% and stainless steel pipes for 6%. Pipes with different external diameters are used. In order to be able to insulate such pipes in a short time, the tradesmen working in building installations must have a large number of pipe insulation elements on hand. These pipe insulation elements must be suitable for the different

The external pipe diameter and the different base materials of the pipes must be taken into account. This results in extensive warehousing with the necessary storage space both in the processing companies and in the companies that manufacture the pipe insulation elements.

When processing the pipe insulation elements in question here, it is important that the pipe insulation elements are applied to the pipes to be insulated over as large an area as possible, so that gaps between the pipe insulation elements and the pipe are avoided. On the other hand, care must be taken to ensure that the pipe insulation elements are attached to the pipe sufficiently firmly. For this purpose, many pipe insulation elements have a lamination, which has a self-adhesive overlap at the factory. During processing, the protective film is removed from the adhesive surface and the self-adhesive overlap is glued to the outside of the pipe shell with the lamination. In addition to this, as with non-laminated pipe elements, a winding wire is used, which is tensioned to the outside of the pipe insulation elements.

Based on this prior art, the invention is based on the object of creating a device with which universally usable pipe insulation elements can be produced in a simple and cost-effective manner, so that the majority of the pipes used in building services can be insulated with a small number of coordinated pipe insulation elements.

To solve this problem, a device having the features of claim 1 is provided.

With this device, pipe insulation elements are produced in such a way that, for example, the primary fleece pulled off at one end of the line is compressed in its middle area so that the compressed area is surrounded by two non-granular

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primed areas along the long sides of the primary fleece. The primary fleece is then folded out in a wave-like manner to produce a sinusoidally arranged pre-material for the production of pipe insulation elements, which has a three-layer structure, the middle layer being the compressed area of the primary fleece. By increasing the bulk density, this fleece area is harder than the two layers arranged on the outside of the fleece, which have a lower bulk density and thus hardness than the middle layer. Finally, the method according to the invention provides that after the secondary fleece has hardened in its sinusoidal arrangement, the secondary fleece is cut open so that after machining, pipe half-shells are created whose outer layer has a higher bulk density than their inner layer. In this case, it is ultimately necessary at least to grind down the outer layer with the lower bulk density to such an extent that the middle layer with the higher bulk density forms the outer surface of the pipe shell after the machining work has been completed, while at the same time the inner layer with the lower pipe density is grooved in order to form a cavity to accommodate a pipe.

For the production of pipe insulation elements, a device is proposed which has a conveyor for transporting a secondary fleece and a pendulum conveyor with which a primary fleece made of mineral fibers and binding agents can be deposited in a meandering manner on the conveyor, the pendulum conveyor consisting of two conveyor belts aligned parallel to one another, between which the primary fleece is conveyed. In order to form the mineral wool fleece, in particular the primary fleece, in such a way that it is compressed in an area running in its longitudinal direction, it is provided that the pendulum conveyor has a compacting conveyor element. The primary fleece is thus fed not only to the pendulum conveyor, but also to another conveyor element which compresses the primary fleece in an area running in its longitudinal direction.

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Preferably, the compacting conveyor element is designed as a crowning of at least one, preferably both conveyor belts of the pendulum conveyor. Accordingly, the conveyor belts of the pendulum conveyor are provided with material thickenings that have a compressive effect on the primary fleece.

Alternatively, it can be provided that the compacting conveyor element is connected downstream of the conveyor belts of the pendulum conveyor and thus forms an independent construction element. It has proven advantageous that such a compacting conveyor element can be easily integrated into existing production systems.

The downstream compacting conveyor element can be designed, for example, as a second pair of conveyor belts of the pendulum conveyor, of which at least one conveyor belt has a camber. Here too, however, it has proven advantageous to design both conveyor belts of the downstream compacting conveyor element with a camber, i.e. a material thickening, so that a uniform compression pressure is exerted on both large surfaces of the primary fleece.

Preferably, the downstream compacting conveyor element is arranged in the conveyor path so that it can be pivoted out, so that not only mineral wool fleeces according to the invention with compressed partial areas, but also such mineral wool fleeces without compressed partial areas can be produced on this production line.

As an alternative to the second pair of conveyor belts, it can be provided that the compacting conveyor element is designed as a pair of rollers, which has two rollers, each of which is arranged below and/or above a conveyor belt of the pendulum conveyor and has a roller section whose diameter is larger than the distance between the conveyor belt sections of a conveyor belt of the pendulum conveyor. The roller sections of the roller pair thus also have a compacting effect on the primary fleece, since their outer surfaces are in the

Conveying path of the primary fleece in such a way that their distance from each other is smaller than the distance between the adjacent conveyor belts of the pendulum conveyor.

The rollers can also be arranged in such a way that they can be pivoted out of the conveying path in order to be able to produce mineral wool fleeces that do not exhibit any compression, in accordance with the above statements.

&iacgr;&ogr; According to a further feature of the invention, each roller has several roller sections that are arranged on an axis. The roller sections are preferably connected to one another in a form-fitting manner and are arranged on the axis in an exchangeable manner. Designed in this way, the rollers can be adapted to the respective desired application both in the event of wear and in order to configure different compression widths and depths. To do this, the roller sections are dismantled from the axes and configured accordingly, so that, for example, roller sections with a larger or smaller width can be used, which form correspondingly wide compression strips in the mineral wool fleece.

Finally, according to a further feature of the device, the compacting conveyor element is driven at a speed that matches the conveying speed of the pendulum conveyor. This design prevents tensile stresses within the conveyed mineral wool fleece in the area of the conveying path between the pendulum conveyor and the conveyor device for transporting the secondary fleece.

With the device explained above, pipe insulation elements according to the invention can be produced from mineral fibers, consisting of a mineral wool fleece, which have at least two layers, of which an inner layer has a lower density and thus hardness than an outer layer. Preferably, in such pipe insulation

An external lamination consisting of a plastic or metal foil is provided for the insulation elements.

Furthermore, in the pipe insulation element according to the invention, it is provided that the outer layer has a bulk density that is 50 to 100% higher than the inner layer.

A further development of the pipe insulation element according to the invention provides that it is designed in two parts and thus has two shell sections that are essentially semicircular in cross section. These shell sections are connected in the area of at least one leg by an adhesive strip that is arranged on one leg surface and connects the leg surface of one shell half to the leg surface of the second shell half. Preferably, a two-sided adhesive tape is used for this purpose, but bonding using hot glue can also be used. Of course, it is possible to form both legs of the shell halves with such an adhesive tape, so that the pipe insulation element can be easily installed. Bonding can be done over the entire surface or part of it.

Further features and advantages of the method according to the invention or of the pipe insulation element according to the invention emerge from the following description of the associated drawing.

In the drawing show:

Figure 1 shows a pipe insulation element in elevation;

Figure 2 shows a pendulum device with a partially
compressed primary fleece;

Figure 3 the primary fleece according to Figure 2 in front of a sinusoidal
unfold;

Figure 4 shows the sinusoidally unfolded primary fleece according to Figure 3; Figure 5 shows the primary fleece according to Figure 4 with a cutting line;

Figure 6 two separate pipe insulation element blanks;

Figure 7 shows the pipe insulation element according to Figure 6 clamped in a grinding device;

Figure 8 is a schematic representation of a second device for producing pipe insulation elements.

Figure 9 shows a section of a first embodiment for producing a mineral wool fleece and

Figure 10 shows a section of a second embodiment of an apparatus for producing a mineral wool fleece.

Figure 1 shows a pipe insulation element 1. The pipe insulation element 1 consists of an outer layer 2 and an inner layer 3, which borders on a cavity 4 for receiving a pipe (not shown in detail). The outer layer 2 has a higher density and thus harder than the inner layer 3. The pipe insulation element 1 can be divided into two halves along the line 5, with each half 6, 7 having two legs 8, 9, each of which has a leg surface on which an adhesive strip (not shown in detail) is arranged for connecting the two halves 6, 7 of the pipe insulation element 1.

Figure 2 shows the general arrangement of a pendulum conveyor 10 above a conveyor 11 with a conveyor belt 12. The exact design of this

Section of a device for producing mineral wool fleeces is explained below with reference to Figures 9 and 10.

Figure 2 shows a mineral wool fleece 13 which is placed on the conveyor belt 12. The mineral wool fleece 13 has a compressed section 14 in its middle area. Two uncompressed sections 15 are arranged to the side of the compressed section 14.

A side view of the mineral wool fleece 13 on the conveyor belt 12 is shown in Figure 3, wherein the arrow 16 indicates the conveying direction and the arrows 17 indicate a continuous, defined up and down movement of the mineral wool fleece in the conveying path.

In the mineral wool fleece 13 according to Figure 3, the uncompressed sections 15 are shown by a thin line and the compressed sections 14 by a thicker line. The arrangement of the mineral wool fleece 13 described above with the associated conveyance in the direction of the arrow 16 and the defined up and down movement in the direction of the arrows 17 leads to a pre-material 18 according to Figure 4. The pre-material 18 has two different bulk densities, whereby the bulk density in the area 20 of the pre-material 18 is greater than in the area 19 of the pre-material 18.

In Figure 5, the raw material 18 is shown again, with the reference number 21 indicating a cutting line along which the raw material is divided into half-shell blanks 22, which are shown in a side view in Figure 6.

Figure 7 shows a further processing station for the production of pipe insulation elements 1. This is a grinding device with an external contour milling cutter 23, which grinds the half-shell blank 22 on its outer surface until the outer layer 2 is arranged on the outside above the inner layer 3. This then creates a pipe insulation element 1 with

the desired properties, namely a hard outer layer which is suitable for absorbing greater forces of the winding wire and a soft inner layer 3 which, due to its low hardness, adapts in a particularly advantageous manner to the outer contour of the pipe to be insulated.

Figure 8 shows a schematic representation of a second device 24 for producing pipe insulation elements 1. This device 24 has a winding core 25, from whose peripheral surface a plurality of guide rollers 26 are arranged at a distance. The winding core 25 and the guide rollers 26 form a winding device 27. Upstream of the winding device 27 is a compression stage 28 which consists of two compression rollers 29 arranged at a distance from one another. The compression rollers 29 can be adjusted in their distance from one another so that the mineral wool fleece 13 can be uncompressed in a section 30 and compressed in a section 31.

The mineral wool fleece 13 is fed to the winding device 27, wherein the non-compressed section 30 is wound onto the winding core 25. The compressed section 31 is then fed to the winding device 27, so that overall a pipe insulation element 1 is formed which has the non-compressed inner layer 3 and the compressed outer layer 2.

Figures 9 and 10 show sections of a known device 32 for producing a mineral wool fleece 13. The device 32 has a melting furnace 33 from which molten rock is fed to a fiberizing device 35 via a spout 34. The fiberizing device 35 fiberizes the withdrawn melt into a fiber stream 36, which has fibers that are deposited as primary fleece 37 on a conveyor device 38. The conveyor device 38 has a first conveyor belt 39, which runs over three deflection rollers 40. This first conveyor belt 39 is followed by a horizontal conveyor belt 41, which feeds the primary fleece 37 to the pendulum conveyor 10. The pendulum conveyor 10 has two spaced apart and parallel

arranged short conveyor belts 42 which are moved in an oscillating manner in the direction of the arrows 43. The conveyor belts 42 of the oscillating conveyor 10 are arranged and aligned in such a way that the primary fleece conveyed by the horizontal conveyor belt 41 is fed perpendicularly to the conveyor belt 12, which also runs over deflection rollers 44. The conveying direction of the conveyor belt 12 indicated by the arrow 45 is aligned at right angles to the conveying direction of the horizontal conveyor belt 41 and at right angles to the conveying direction of the conveyor belts 42 of the oscillating conveyor 10, the conveying direction of the conveyor belt 12 being in a plane parallel to the conveying direction of the horizontal conveyor belt 41. &iacgr;&ogr; The conveying direction of the horizontal conveyor belt 41 is indicated by the arrow 46.

The primary fleece 37 is deposited on the conveyor belt 12 via the pendulum conveyor 10 in a meandering manner and at right angles to the conveying direction of the conveyor belt 12 before it is pre-compressed by means of a plurality of rollers 47. The secondary fleece thus produced can then be processed into pipe insulation elements 1 in the manner described above. In order to compress the primary fleece 37 in the area of the pendulum conveyor 10, it is provided according to Figure 9 that the conveyor belts 42 have a camber 48 in their middle area. The conveyor belts 42 therefore have a greater material thickness in their middle area.

This cambering 48 leads to a compression of the primary fleece 37 in the central region before the primary fleece 37 is deposited as a secondary fleece on the conveyor belt 12.

An alternative embodiment of the device 32 is shown in Figure 10. This device 32 according to Figure 10 differs from the device 32 according to Figure 9 in that the conveyor belts 42 of the pendulum conveyor 10 are followed by rollers 49 which are guided in a pendulum motion together with the conveyor belts 42 of the pendulum conveyor 10 in accordance with the arrow 43. The rollers 49 each have an axis (not shown in detail) on which roller sections

50 are arranged, wherein the middle roller section 50 has a larger diameter than the two roller sections 50 flanking the middle roller section 50. The flanking roller sections 50 have a diameter which essentially corresponds to the diameter of the deflection rollers of the conveyor belts 42 plus the material thickness of the conveyor belts 42.

The roller sections 50 are positively connected to one another and are driven at a rotational speed which corresponds to the transport speed ω of the conveyor belt 42, so that the primary fleece 37 is not stretched or compressed by a force acting in the longitudinal direction of the primary fleece.

The production of a pipe insulation element is therefore carried out by compressing the primary fleece 37 in its central region following the pendulum conveyor 10 by means of the roller sections 50 of the rollers 49. A degree of compression of 10 to 50% of the original bulk density is achieved, whereby the material thickness of the compressed and non-compressed sections depends on the pipe insulation elements 1 to be produced. The inner diameter and insulation thickness of the pipe insulation elements play a special role here. The secondary fleece removed from the pendulum conveyor 10 and partially compressed is then guided in front of a hardening oven over two conveyor belts which continuously carry out a defined up and down movement and which simultaneously transport the primary fleece at a defined transport speed. The combination of the up and down movement and the transport movement causes the secondary fleece to be arranged in a sinusoidal shape. This sinusoidally arranged secondary fleece forms a primary material that has a soft upper side and a hard middle layer as well as a soft lower side. The primary material produced in this way is then sawn horizontally and the resulting half-shell blanks are fed to the grinding or milling unit. The inner and outer contours of the half-shells are produced in the grinding or milling unit. When machining the outer diameter,

A lot of material is ground away so that the hard core remains as the outer surface of the half-shell.

Claims (15)

1. Pipe insulation element made of mineral fibers, consisting of a mineral wool fleece ( 13 ) which has at least two layers, of which an inner layer ( 3 ) has a lower density and thus hardness than an outer layer ( 2 ). 2. Pipe insulation element according to claim 1, characterized in that a lamination is arranged on the outside of the outer layer ( 2 ). 3. Pipe insulation element according to claim 2, characterized in that the lamination consists of a plastic or metal foil. 4. Pipe insulation element according to claim 1, characterized in that the outer layer ( 2 ) has a bulk density 50 to 100% higher than the inner layer ( 3 ). 5. Pipe insulation element according to claim 1, characterized in that the pipe insulation element ( 1 ) is designed in two parts and thus has abutting leg surfaces, wherein an adhesive strip is arranged in the region of at least one leg surface. 6. Device for producing pipe insulation elements made of mineral fibers which are compressed in a region running in their longitudinal direction, with a conveyor device for transporting a secondary fleece and a pendulum conveyor with which a primary fleece formed from mineral fibers and binding agents can be deposited in a meandering manner on the conveyor device, the pendulum conveyor consisting of two conveyor belts aligned parallel to one another, between which the primary fleece is conveyed, characterized in that the pendulum conveyor ( 10 ) has a compacting conveyor element. 7. Device according to claim 6, characterized in that the compacting conveyor element is designed as a crowning ( 48 ) of at least one, preferably both conveyor belts ( 42 ) of the pendulum conveyor ( 10 ). 8. Device according to claim 6, characterized in that the compacting conveyor element is arranged downstream of the conveyor belts ( 42 ) of the pendulum conveyor ( 10 ). 9. Device according to claim 8, characterized in that the downstream compacting conveyor element is designed as a second pair of conveyor belts of the pendulum conveyor ( 10 ) and has a crowning ( 48 ) on at least one side. 10. Device according to claim 9, characterized in that the downstream compacting conveyor element is arranged so as to be pivotable in the conveyor path. 11. Device according to claim 6, characterized in that the conveyor element is designed as a pair of rollers which has two rollers ( 49 ) which are each arranged below and/or above the conveyor belt ( 42 ) of the pendulum conveyor ( 10 ) and have a roller section ( 50 ) whose diameter is larger than the distance between the conveyor belts ( 42 ) of the pendulum conveyor ( 10 ). 12. Device according to claim 11, characterized in that each roller ( 49 ) has several roller sections ( 50 ) which are arranged on an axis. 13. Device according to claim 12, characterized in that the roller sections ( 50 ) are preferably connected to one another in a form-fitting manner. 14. Device according to claim 12, characterized in that the roller sections ( 50 ) are arranged interchangeably on the axis. 15. Device according to claim 6, characterized in that the compacting conveyor element is driven at a speed corresponding to the conveying speed of the pendulum conveyor ( 10 ).