DE102015105680A1 - Coating device for internal coating of pipelines - Google Patents

Abstract

Coating device (1) for internally coating pipelines (5) with a sealing, flowable coating material, comprising an application device (2) for applying the coating material to a pipeline inner wall (51) and a medium line (4) for conducting the coating material from a supply device (3). outside the applicator device (2), the coating material supplied by the supply device (3) via the medium line (4) to the applicator device (2) being prepared as a finished component.

Description

The invention relates to a coating device for internal coating of pipelines with a sealing, flowable coating material, which comprises an application device for applying the coating material to a pipeline inner wall and a medium line for conducting the coating material from a supply device outside the applicator to this.

The rehabilitation of damaged ductwork or piping systems installed in the floor or in a wall can sometimes be laborious. Thus, for example tubular fresh water or sewer pipes or the like are often difficult to access installed z. B. under road coverings or are laid as supply lines to buildings in the ground. Inside buildings, they are usually built into walls.

Not infrequently it comes with installed pipelines over time to damage, such. B. Corrosion or ingrowth of root system in the pipe interior area, which lead to leaks. In the required renovation, an exchange of damaged line areas with a high construction cost and associated costs.

To avoid this, various devices and methods are known for sealing an existing pipeline in a damaged area. For example, in the WO 002013/095143 A1 a device with an applicator for applying curable plastic to the inner wall of a pipe construction specified. The applicator head is moved through the channel and the curable plastic is fed into two components separately fed to a directly upstream of the applicator head feed chamber. In the feed chamber, the two components are mixed prior to application and then applied over the applicator head to the inner wall of the pipeline to form a sealing coating. However, the separate supply of the two components brings a relatively high cost in their broad position with it. Also, the cleaning process of the acted upon with the mixture components of the device designed consuming, since the mixed components cure for a short time.

It is an object of the invention to provide an apparatus and a method for the simplest possible rehabilitation of damaged pipes.

This object is achieved for the device with the features of claim 1 and for the method with the features of claim 18. With regard to the device, it is provided that the coating material supplied by the supply device via the medium line of the application device is prepared as a finished component. Prepared in this case means that the component does not need to be added to an additional component during feeding before application. In the method it is provided that the coating material is supplied from a supply device via a medium line of the applicator as a ready-prepared component.

The supply of the coating material as a component entails, on the one hand, the advantage of simply providing the coating material for application via the application device, since a reservoir of coating material may suffice. In addition, only one line needs to be provided for conveying the coating material in the medium line. Furthermore, the cleaning process of z. For example, the applicator applied to the coating material facilitates the coating process since it preferably does not cure relatively quickly (eg, within less than about 5 to 10 minutes) of the coating material under ambient conditions such as in-gear -Setting a chemical reaction by a mixing process with separate supply of two components may be the case.

In an advantageous embodiment variant, it is provided that the application device comprises a distributor head for applying the coating material by means of spraying. Conceivable is a rotatable arrangement of at least a part of the applicator about a central longitudinal axis with one or more distributor nozzles, wherein the rotation can support a uniform application of the coating material. In a preferred variant, however, the distributor head has a plurality of distributor nozzles arranged on a circular circumference for spraying the coating material onto the inner wall of the pipe, it being possible to dispense with a rotational movement and thus rotating parts of the applicator device. The distributor nozzles may be suitable at an angle with respect to the central longitudinal axis, so that z. B. the central spray direction has a velocity component in the direction of movement of the applicator. A uniform order, it is beneficial if the distributor nozzles z. B. at equal angular intervals in the circumferential direction spaced from one another. In this case, the spray cone can be set overlapping, so that over the inner tube circumference a closed coating is obtained. In the overlap, the spray indicatrix of the spray cone or the sprayed area resulting therefrom is preferably considered and coordinated, especially with regard to the distribution of material on the spray surface. Furthermore, it may be advantageous if the distributor nozzles also subsequently with respect to certain parameters such. B. angle of inclination with respect to the central longitudinal axis are adaptable. For a uniform spray application, it is also advantageous if the nozzles are matched as well as possible to the viscosity of the coating material. For the spraying process, the coating material should be supplied to the applicator with a sufficiently high pressure, the pressure being system-dependent. The design of a pressure level with respect to a line system is known from the prior art. This ensures that, for example, the pressure loss via the distributor nozzles and further pressure losses can be overcome and a spray cone with a uniform atomization can be generated.

In an alternative advantageous embodiment variant, it is provided that the application device comprises a rotatable distributor head for applying the coating material by means of spin coating. In this case, a relatively low delivery pressure of the coating material may advantageously be sufficient, since the centrifugal force generated during the rotational movement can additionally be used for the order.

If the rotation of the distributor head is caused by a drive via compressed air, can be dispensed with a mechanical coupling of the distributor head with a drive unit located outside the pipeline. For this purpose, the medium line to be assigned a separate, compressed air line leading to lead compressed air from one of the supply device associated compressed air supply unit to the drive of the distributor head. It would also be conceivable that for curing purposes to the applicator guided hot air is also used for the drive, which may optionally have a higher pressure than if it is not used in addition to drive purposes.

In order to be able to keep properties, for example the viscosity of the coating material, substantially constant, it can be advantageously provided that the application device comprises a temperature control device for influencing the temperature of the coating material flowing through the application device and / or at least parts of the distributor head. The tempering device can, for example, be operated with water and / or serve for cooling, the medium line advantageously being assigned an additional water line with which the water is conveyed to the temperature control device.

For a simple operation of the coating device, it is advantageous if the supply device comprises at least one of the units operating unit with a control device, medium line housing, reservoir for coating material, apparatus for providing hot air and a compressed air supply unit. For a compact housing and good operability during operation, it may be advantageous if the medium line housing, the device for providing hot air, the compressed air supply unit and / or the reservoir for coating material are integrated into the operating unit. The individual units are preferably accommodated easily accessible, for example via maintenance flaps. The medium line housing may advantageously comprise a rolling device, wherein the rolling z. B. can be done by means of a motor. Additionally or alternatively, at the operating unit connections for media, eg. As water, (pressure and / or hot) air and / or coating material may be present, so that these can be supplied via separate units and collected in the operating unit of the medium line, divided into individual lines, can be supplied. Furthermore, the reservoir for the coating material may include a feed pump.

A uniform application is beneficial if the applicator has a centering device for axially centered positioning of the applicator in the pipeline. In this way, the nozzles of the applicator are kept at a defined distance from the pipe wall, in particular, all nozzles can be evenly spaced from the wall.

For rapid curing (eg below one minute) of the coating material in the coating process, it is advantageous if the application device comprises a curing device for curing the coating material after it has been applied to the inner wall of the pipeline. Full hardening is advantageous here, but at least partial hardening should be achieved, the complete hardening subsequently taking place. By the curing process, a possible flow of the applied coating can be prevented and the curing of the coating carried out controlled.

In an advantageous Ausgestalungsvariante while the curing device for curing the coating material is formed by means of hot air and the medium line associated with the curing device associated hot air line. The hot air line can be isolated in order to prevent heat transfer to other lines of the medium line largely. In such a curing device, heat and / or Convection contribute to the curing of the coating material, which may include drying processes.

Advantageously, it can be provided that the curing device comprises a plurality of arranged on a circular circumference air distribution nozzles for blowing hot air in the direction of the pipe inner wall. Advantageously, the nozzles can be arranged spaced apart from one another such that their air cones overlap on blowing in the region of the pipe inner wall, so that hot air is applied to the coating material to be cured as uniformly as possible and thus hardened. It would also be conceivable for this purpose, a rotating curing device. Furthermore, preferably, the angle of incidence of the nozzles with respect to the central longitudinal axis of the tube at an angle other than 90 ° inclined and / or be adjustable. For example, the Ausblaserichtung the hot air can be accurately adjusted, for. B. slightly away from the direction of movement of the applicator, so that the spray cone of the coating material and the hot air do not overlap during discharge from the respective nozzles. In order to achieve a more uniform outflow of the hot air from all air distributor nozzles, which contributes to a uniform air distribution and thus a uniform hardening process, an annular hot-air plenum upstream of the nozzles on the curing device can be advantageous, so that a more uniform pre-pressure distribution at the nozzles can be achieved ,

Furthermore, it is advantageous for a controllable drying process if the curing device has at least one temperature sensor for determining the hot air temperature, if the supply device is also designed to provide hot air and if the temperature sensor is in data transmission connection with the supply device. For this purpose, z. As a data transmission cable in the media line may be provided, but other suitable, such as wireless data transmission options are conceivable. It can also be provided that the temperature of the control device is supplied to the display and / or for monitoring. Furthermore, a control can be provided to automatically regulate the hot air temperature / s to a desired value. For example, the hot air in the region of the curing device has a temperature between 50 ° C. and 120 ° C., matched to the properties of the coating material and the environment.

In addition or as an alternative to the hot air, it may be provided that the curing device is designed to harden the coating material by means of UV light. It would also be conceivable to provide warming IR light.

For easy cleaning after operation, the line of the medium line for the coating material preferably consists on the inside of material which is not liable to the coating material, in particular at least partially made of Teflon. Thus, after operation, the line can be simply blown out with a medium, preferably compressed air or even a cleaning liquid. It would be conceivable, for example, that for a cleaning process, the connection is decoupled from the reservoir for the coating material to the medium line in the supply device and instead a cleaning device, the z. B. may be a compressor for air or cleaning fluid (with the corresponding liquid) is coupled to the relevant point of the medium line. Subsequently, the corresponding cleaning medium can be flowed through, whereby the distributor nozzles are cleaned.

To during the coating process subsequent to the curing process a check z. B. to perform the coating quality, can be advantageously provided that the applicator is associated with a tester. This can, for. B. for testing the material hardness and / or thickness serve, and for example, have a camera. In this case, the test device is expediently arranged in the direction of movement behind the curing device, so that in the coating process, a specific pipe section is first passed by the distributor head, then by the curing device and then by the tester.

Appropriately it can be provided that the coating device has a locomotion device, by means of which the applicator is movable in the longitudinal direction of the pipeline. This can, for. Example, be arranged outside the pipeline drive over which the medium line in a defined speed in its length can be varied about a rolling device, wherein the applicator is moved coaxially in the pipeline. It would also be conceivable that the applicator itself has a drive with which it can move in the pipeline.

In an advantageous variant of the method it is provided that during the coating process to the application process during the same passage of the applicator through the pipeline, in which the application is carried out, followed by a curing process in which the applied coating material, in particular by means of hot air, is cured. Also conceivable is an optionally additional curing by means of UV and / or IR light.

The invention will be explained in more detail with reference to an embodiment with reference to the drawings. It shows:

1 a coating device according to the invention for internal coating of pipelines in a schematic representation.

1 shows a schematic representation of a coating device 1 with a supply device 3 outside a pipeline 5 and one during operation inside the pipeline 5 located applicator 2 for applying a coating 52 of sealing coating material on a pipeline inner wall 51 , The applicator 2 is via a media line 4 with the supply device 3 in communication, the medium line 4 over its length a protective and / or bundling sheath 41 having. Inside the casing 41 can different lines of the medium line 4 run, in particular a line for supplying the applicator 2 with coating material.

The applicator 2 includes a distributor head 22 , Behind the (with respect to the direction of movement indicated by an arrow) a curing device 23 and again with respect to the direction of movement behind the curing device 23 a test device 24 is arranged. The distributor head 22 and the curing device 23 the applicator 2 are for example at an axial distance between 2 and 15 cm with respect to their respective axial center to each other and each coaxially on a central longitudinal axis M of the pipeline 5 arranged. The tester 24 is advantageous for a compact construction similar to the curing device 23 axially spaced, and is also coaxial on a central longitudinal axis M of the pipeline 5 arranged. It would also be conceivable to integrate at least parts of the test device 24 , such as As a camera, in the curing device 23 , Measuring signals of the test device 24 can be at least partially evaluated in this or even forwarded to a remote from her processing unit.

Furthermore, the applicator 2 a centering device 21 on, to said coaxial elements of the applicator 2 to keep in the coaxial with respect to the tube position. In the embodiment shown, the centering device 21 the distributor head 22 (in the direction of movement), wherein it should be spaced so far that they are out of range of the coating material during its application by the distributor head 22 lies. In this case, the centering device 21 at least two rolling or sliding bodies 21.1 on top of that with the inner wall of the pipeline 51 are in supporting contact, whereby they move during the application device 2 at the pipeline inner wall 51 move along. The rolling or sliding bodies 21.1 are by means of centering elements 21.2 and stabilizing support members, such as struts 21.3 , to the distributor head 22 Tied to the supporting force of the centering device 21 on the distributor head 22 and optionally the curing device 23 transferred to. The struts 21.3 and / or the sliding bodies 21.1 or their storage may have resilient elements, so that unevenness of the pipe inner wall 51 when moving through the pipeline 5 can be compensated. Also conceivable is the arrangement of the centering device 21 at a different location or at several different locations of the applicator 2 (not shown here). Also another embodiment of the centering device 21 is possible, which fulfills the purpose of centering, such as integration in the distributor head 22 , the curing device 23 and / or the test device 24 ,

Between the distributor head 22 and the curing device 23 can the media line 4 be continued flexible, which the mobility of the applicator 2 especially in areas of the pipeline 5 is conducive to tight bending radii. However, a slightly stiffer, can be selected up to a non-bendable connection of the two elements, so that z. B. in the axial centering of an element, the other is also centered. This is especially in close arrangement of the two elements, eg. B. between 2 and 7 cm advantageous. The connection of the test device 24 to the curing device 23 For similar reasons, it can be configured as flexible over something stiffer or not bendable. In flexible training, the tester 23 expedient additionally a centering device 21 be assigned (not shown here). The medium line needs between the curing device 23 and tester 24 expedient no longer all lines, such as no coating material line or air line to include more.

The distributor head 22 has a distribution ring 22.2 with a circular outer circumference, on which several distributor nozzles 22.1 for applying the coating material to the pipe inner wall 51 are arranged. The distributor nozzles 22.1 are circumferentially positioned at equal angular distances from each other to achieve the most uniform application of the coating material. In the distributor ring may be provided a ring plenum for coating material to a uniform pre-pressure at the nozzles 22.1 which in turn facilitates a uniform order. The nozzles 22.1 are designed for optimal application to the viscosity range of the coating material. Also other suitable embodiments of the distributor head 22 are conceivable for example with several rows of nozzles and / or a rotatable distributor head 22 for spraying or even spinning the coating material onto the pipe inner wall 51 , The drive of any rotatable parts of the applicator can be done by a shaft, or advantageously by compressed air.

The behind the distributor head 22 arranged curing device 23 is for targeted application of the applied coating 52 formed with hot air to cause a rapid drying or curing process of the coating material. The curing device 23 also has an air distribution ring 23.2 with arranged on the circular outer circumference air distribution nozzles 23.1 on. In order to achieve a uniform as possible loading of the coating with hot air, are also the air distribution nozzles 23.1 Positioned in the circumferential direction at equal angular intervals to each other. To the curing device 23 is one of the media line 4 associated hot air line connected to the supply of hot air.

For supply and operation, the coating device 1 the z. B. outside the pipeline 5 to be arranged supply device 3 on. The supply device 3 is an operating unit in this example 32 with a control device 32.1 , a media line housing 32.2 to accommodate the medium line 4 and a hot air generator 32.3 assigned as a device for providing hot air. The integration of various components of the supply device 3 in the operating unit 32 brings the advantage of a compact and easy to handle coating device 1 with himself. The control device 32.1 can be a control panel and / or a display unit with visual display for operating and / or monitoring the coating device 1 include. In the medium line housing 32.2 may be a rolling or retracting device for selectively extending or shortening the extended portion of the medium line 4 be present, for which an electric drive can be assigned. It is also conceivable integration of other components in the supply device 3 working in the operating unit 32 integrated or can be arranged separately.

To the operating unit 32 via a supply line 31.1 and a connection 32.4 coupled has the supply device 3 continue a reservoir 31 with coating material on. Within the operating unit 32 the coating material is preferably a conduit of the medium line 4 fed. To promote the coating material through the medium line is also advantageous a feed pump z. B. in the operating unit 32 intended. The separate arrangement of the reservoir 31 ensures good accessibility and allows easy replacement of an empty coating material container. Likewise, other media, such as hot air and possibly other substances in other lines of the medium line 4 be supplied. In this case, preferably the medium line 4 also assigned electrical lines, z. B. a data transmission connection between sensors or other electrical components of the applicator 2 and the controller 32.1 or the processing device, which in turn is a part of the control device 32.1 can be. This way, in the operating unit 32 the at the applicator 2 required material or electricity lines bundled and the medium line 4 the applicator 2 fed.

In a coating process, the applicator becomes 2 through the pipeline 5 that z. B. has a small diameter (eg., Between 5 and 20 cm), moved through at a uniform rate. The drive can, for example, via the medium line 4 carried out, the extended length z. B. can be varied evenly over the unwinding device. The speed represents (for example, in addition to the spray strength) a parameter for adjusting the layer thickness of applied coating material. In the present example, the movement of the applicator takes place 2 in the to the media line 4 or the supply device 3 pointing direction. But it would also be possible to move in the opposite direction, ie in the medium line 4 opposite direction, the order of the units of the applicator 2 if necessary, so that the sequence described below is adhered to during the coating process.

A location to be coated on the inner wall of the pipeline 51 is in an application process of the coating process, first from the distributor head 22 happens, with coating material on the inner wall of the pipeline 51 is applied as evenly as possible in a closed over the pipe circumference layer. When applied, the coating material is still flowable. Subsequently, the coated part of the curing device 23 happens, in a curing process of the coating process, the coating, in the present example by means of hot air, is cured to form a solid, possibly flexible layer. The spray cones are the distributor nozzles 22.1 and the blow-out direction of the air distribution nozzles 23.1 preferably adjusted so that they do not overlap to harden the coating material before reaching the inner wall of the pipe 51 to prevent. The duration between application and curing depends not only on the properties of the coating material but also on the spacing of the distribution nozzles 22.1 from the air distribution nozzles 23.1 , the setting of the spray or blow-off cone and the speed at which the applicator 2 along the inner wall of the pipeline 51 is moved.

It would be conceivable that first a layer of coating material is applied and cured and that subsequently in the same coating process, a further layer is applied to the first. For this purpose could be behind the curing device 23 another distributor head 22 followed, if necessary, by a further curing device 23 be arranged.

The cured at the site coating can then in a control process within the coating process by means of the moving past her tester 24 z. B. be judged in terms of their layer thickness and hardness, so that the quality of the coating can be controlled within the coating process.

After the coating process, the storage container can be cleaned to clean the coating device 31 from the operating unit 32 be decoupled. To the connection 32.4 can instead z. B. a compressor can be connected, with the means of compressed air, the line of the coating material of the medium line 4 and the distributor head 22 can be blown through with high pressure. Preferably, the corresponding line is at least partially coated on the inside with a non-liable for the coating material material, in particular Teflon, and / or consists thereof. By blowing with compressed air, the coating material can be removed in a simple and environmentally friendly manner without harmful cleaning agents from the line and the distributor head.

All in all, by means of the disclosed embodiment and its variants, a coating device which is comparatively easy to handle 1 obtained with a comparatively simple coating method.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 002013/095143 A1 [0004]

Claims (19)

Coating device ( 1 ) for internal coating of pipelines ( 5 ) with a sealing coating material, which is flowable before it cures, and which has an application device ( 2 ) for applying the coating material to a pipeline inner wall ( 51 ) as well as a media line ( 4 ) for conducting the coating material from a supply device ( 3 ) outside the applicator ( 2 ), characterized in that that of the supply device ( 3 ) via the medium line ( 4 ) of the applicator ( 2 ) is prepared as a finished component. Coating device ( 1 ) according to claim 1, characterized in that the applicator ( 2 ) a distributor head ( 22 ) for applying the coating material by spraying. Coating device ( 1 ) according to claim 2, characterized in that the distributor head ( 22 ) multiple, arranged on a circular circumference distribution nozzles ( 22.1 ) for spraying the coating material on the inner wall of the pipeline ( 51 ) having. Coating device ( 1 ) according to claim 1, characterized in that the applicator ( 2 ) a rotatable distributor head ( 22 ) for applying the coating material by spin coating. Coating device ( 1 ) according to claim 4, characterized in that the rotation of the distributor head ( 22 ) is caused by a drive via compressed air. Coating device ( 1 ) according to one of the preceding claims, characterized in that the applicator ( 2 ) a tempering device for influencing the temperature of the by the applicator ( 2 ) flowing coating material and / or at least parts of the distributor head ( 22 ). Coating device ( 1 ) according to one of the preceding claims, characterized in that the supply device ( 3 ) at least one of the structural units operating unit ( 32 ) with a control device ( 32.1 ), Medium line housing ( 32.2 ), Reservoir ( 31 ) for coating material, apparatus for providing hot air and compressed air supply unit. Coating device ( 1 ) according to one of the preceding claims, characterized in that the applicator ( 2 ) a centering device ( 21 ) for the axially centered positioning of the applicator ( 2 ) in the pipeline ( 5 ) having. Coating device ( 1 ) according to one of the preceding claims, characterized in that the applicator ( 2 ) a curing device ( 23 ) for curing the coating material after application of the coating material. Coating device ( 1 ) according to claim 9, characterized in that the curing device ( 23 ) is formed for curing the coating material by means of hot air and that the medium line ( 4 ) one with the curing device ( 23 ) associated with associated hot air line. Coating device ( 1 ) according to claim 9 or 10, characterized in that the curing device ( 23 ) several, arranged on a circular circumference air distribution nozzles ( 23.1 ) for blowing out hot air in the direction of the pipe inner wall ( 51 ). Coating device ( 1 ) according to claim 10 or 11, characterized in that the curing device ( 23 ) has at least one temperature sensor for determining the hot air temperature that the supply device ( 3 ) is also designed to provide hot air and that the temperature sensor with the supply device ( 3 ) is in communication. Coating device ( 1 ) according to one of claims 10 to 12, characterized in that the hot air in the region of the curing device ( 23 ) has a temperature between 50 ° C and 120 ° C. Coating device ( 1 ) according to one of claims 9 to 13, characterized in that the curing device ( 23 ) is formed for curing the coating material by means of UV light. Coating device ( 1 ) according to one of the preceding claims, characterized in that the line of the medium line ( 4 ) for the coating material on the inside of the non-adhesive material for the coating material, in particular at least partially made of Teflon. Coating device ( 1 ) according to one of the preceding claims, characterized in that the applicator ( 2 ) a test device ( 24 ) assigned. Coating device ( 1 ) according to one of the preceding claims, characterized in that it is a locomotion device by means of which the applicator device ( 2 ) in the longitudinal direction of the pipeline ( 5 ) is movable. Process for internal coating of pipelines ( 5 ) with a sealing coating material by means of a coating device ( 1 ), wherein during a coating operation an applicator device ( 2 ) by means of a drive coaxial in a pipeline ( 5 ) and coating material is applied to a pipeline inner wall by a spraying or spinning process in an application process of the coating process ( 5 ) is applied, characterized in that the coating material from a supply device ( 3 ) via a medium line ( 4 ) of the applicator ( 2 ) is supplied as a ready-made component. A method according to claim 18, characterized in that during the coating process to the application process during the same passage of the applicator ( 2 ) through the pipeline ( 5 ), in which the application takes place, followed by a curing process, in which the applied coating material, in particular by means of hot air, is cured.

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