DE1652415B2 - DEVICE FOR THE INTERIOR COATING OF PIPES WITH DIFFERENT LAYER THICKNESS - Google Patents

Description

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The invention relates to a device for internal coating of pipes with different layer thicknesses with viscous, hardening substances, consisting of one to be introduced centrally into the pipe to be coated onto a rotating distributor disc directional spray head.

The inherently high resistance: against chemical and mechanical aggression of the concrete pipes used in sewage technology can be significantly increased by internal coating with suitable means. The proportion of concrete-damaging SuD punches in industrial and household wastewater is constantly increasing. The technical and economic advantages of the concrete pipe can be opened up to new areas of application if a corresponding durability _{Jo of} the pipe is guaranteed. This durability wedge can be achieved via the inner coating. In particular, the bottom third of the pipe must be protected against mechanical and chemical attacks. The upper part of the tube required, since it is not exposed to mechanical attacks _SJ entrained attachments, only a protective film against chemical aggression. An internal coating of different layer thicknesses is therefore the most economical solution.

It is known to provide pipes with a protective film manually by means of brushes or rotating spray nozzles or ring nozzles. Devices such as B. in US-PS 32 33 580 and GB-PS 9 64 954, are only suitable for the application of an Eleschichtung of uniform thickness. A Heschich- ₅ ^ processing with different layer thickness in a uniform distribution by the addition of fillers to the coating composition in one operation applied, can not be achieved with the known devices. Several work steps are required for this.

The invention is based on the object of repairing the inner surface of tubular hollow bodies in one operation to provide by means of a device with a layer which in a desired area a has different, continuously running layer thicknesses. The one to be applied is preferred Layer thicker at the bottom of the pipe.

According to the invention, this object is achieved in that, in addition to a centrally located in the pipe to be coated to be introduced, directed at a rotating distributor disc spray head an adjustable dosing tube for the supply of powdered fillers is arranged at such a distance from the center of the axis, that a one-sided, thicker coating of the pipe takes place.

As an advantageous further development it is provided that the distributor disk is flat-truncated-cone-shaped or ellipsoid-shaped is arched and when formed in a cone shape has a slope angle of 5 to 45 °. It is also provided that the spray head has one or more separate spray medium chambers and spray supplies, wherein the nozzle orifices are arranged so that the Premix the spray jets between the spray head and the rotating distributor disc.

The device according to the invention is explained in more detail with reference to the drawings. It shows

1 shows a longitudinal section through the coating device with a spray chamber, metering tube and distributor disc,

F i g. 2 shows a longitudinal section through a spray head with several spray medium chambers.

The device consists of a spray head I, which has one or more separate spray medium chambers 1 which are connected to nozzles 3 by bores 2. The calibrated nozzle openings 4 have a in front of the spray head rotating distributor disk II, which in its middle part is truncated cone or ellipsoidal arched and the flattened, outer edge 5 of which is provided with guide vanes 6.

The drive shaft 7 for the distributor disc runs lengthways through the center of the spray head and is multiple, expediently stored twice.

The spray agent chambers 1 are continuously supplied via feed lines via one or more connections 8 supplied with the sprays. The spray medium chambers are surrounded by a sealed cover 9 locked.

Associated with the spray head is a tube III for the targeted and quantitatively adjustable task of Fillers in a determinable area of the distributor disc.

It works as follows: The spray head and the rotating distributor disc are located on the End of the pipe to be coated. During the coating process they become constant Speed moved in the direction of the imaginary pipe axis. The pipe is immobile. A valve gives the flow of the viscous coating agent free. At the same time, the powdery filler begins to flow. Both substances meet on the inside of the distributor disk. The distributor disc is with the viscous spray wetted. The powdery filler inevitably envelops itself as a result of the rotation with the spray. Both substances are made by the

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Centrifugal force pushed over the edge of the disk The shape of the distributor disk forces a relatively slow one If the substances rise along the specified disc profile, intimate mixing takes place. The kinetic energy communicated to this mixture is only destroyed at the pipe wall Firmly adhering layer builds up on the inner wall of the pipe.

Since the Füluioff is only in one area of the rotating If the disc is abandoned, it is also thrown off on one side. This creates on the pipe wall the desired effect of the one-sided thicker layer. The area of this greater layer thickness is precisely localizable. It depends on the diameter, shape, pitch and speed of the disc as well Task amount of the coating substances.

By adjusting the filler feed area on the distributor disc, the zone can be larger Layer thickness can be determined if the other values remain the same. The closer the drop point of the Metering tube is set up to the center of the distributor disc, the larger the area of the greater layer thickness.

The layer thickness is reduced. The further the metering tube to the edge of the rotating distributor disc is established, the narrower the coating area becomes as the layer thickness increases. The speed of movement along the pipe axis determines the total layer thickness.

In the case of a desired coating without filler, one obtains one with the same spray device uniform all-round coating.

For the coating of pipes with a nominal diameter of 30 to 50 cm a conical one has been used Disc with the following dimensions proved to be particularly useful:

Overall diameter outer edge 110.0 mm

Diameter of the conical

Partly 72.4 mm

Angle of slope of the cone 16 degrees

Number of guide vanes on

Disc edge 12

Revolutions per minute 650

When using cold-curing plastics, e.g. B. epoxy resins, it has proven to be useful to mix the individual components of the plastic only in or shortly before the spray nozzle in order to achieve a to avoid premature hardening of the material. For this purpose the spray head contains one or more separate spray chambers, with holes to the nozzle openings are arranged so that the Mix the spray jets between the spray head and the rotating disk. Another benefit of this Arrangement is that the supply lines and reservoirs not after each use of prematurely hardened material must be cleaned.

The exact dosage of the components is done by choosing different delivery rates and -pressures as well as corresponding nozzle cross-sections.

For coating, the pipes, for. B. concrete pipes, expediently placed vertically In this way, the supply of the powdery filler from above in easily done without additional pressure application.

The advantages that can be achieved with the device according to the invention are, in particular, that in one Operation in a simple manner tubular hollow body can be internally coated, the applied layer in desired areas, preferably on the sole, is stronger.

For this purpose 2 sheets of drawings

Claims (3)

Patent claims: 1. Device for the inside coating of pipes with different layer thicknesses with viscous. hardening materials, consisting of a centrically introduced into the pipe to be coated, Spray head (I) directed towards a rotating distributor disc, characterized in that that in addition to the spray head (I) an adjustable metering tube (III) for the supply of powder Fillers are arranged at such a distance from the center of the axis (7) that a one-sided, thicker coating of the pipe takes place. 2. Device according to claim 1, characterized in that that the distribution rail (II) is flat and truncated cone-shaped or is arched ellipsoidally and in the form of a cone when it is formed Has a slope angle of 5 to 45 °. 3. Device according to claim 1, characterized in that that the spray head (1) has one or more separate spray medium chambers (1) or spray medium supply lines (2), wherein the nozzle openings (3) are arranged so that the spray jets Premix between spray head (I) and rotating distributor disc (II).