EP1144121A1

EP1144121A1 - Method for coating the inside of pipes and coating system

Info

Publication number: EP1144121A1
Application number: EP00902556A
Authority: EP
Inventors: Klaus Berdin; Eckehard Deggerich; Klaus Mathmann
Original assignee: DBS Beschichtung und Systeme Technik GmbH
Current assignee: DBS Beschichtung und Systeme Technik GmbH
Priority date: 1999-01-26
Filing date: 2000-01-26
Publication date: 2001-10-17
Also published as: WO2000044506A1; AU2430100A; CA2374448A1; US6699324B1

Abstract

The invention relates to a coating system in the form of a vehicle (3), which can travel in a pipe (1) or a duct. The coating system is pulled over an appropriately stabilised section of piping (4) in such a way that the inner wall (58) can be evenly coated by a rotating distributor (18) with an outlet opening (29). The various product and supply lines (20, 21, 22, 136) are securely accommodated inside the section of piping (4) by means of a highly resistant flexible tube (138) into which they are drawn. Said flexible tube is air-tightly sealed by covers (148, 149) or a terminal block (150) at the ends and is also configured to absorb tensile forces. The individual supply and product lines (20, 21, 22, 136) are thereby protected in the section of piping (4) without being subjected to excessive pulling or other forces. They are also prevented from interfering with each other. The advantageous, simple, lightweight configuration of the section of piping (4) can therefore be used to continuously clean sections of pipes (1) and ducts of 150 m and more.

Description

Ner driving for internal coating of pipes and coating system

Description

The invention relates to a ner driving for the inner coating of pipes and similar elongated hollow bodies via a vehicle with distributor which can be moved longitudinally in the tube, the components of the coating agent being carried separately to the distributor in a common line, then mixed intensively and as a mixture in the direction of pull behind the vehicle the inner wall of the tube can be applied. The invention also relates to a coating system for the inner coating of pipes and similar elongated hollow bodies with a vehicle guided by means of a drive along the inner wall of the pipe and having a distributor for the coating agent, which is connected to at least one coating agent reservoir via a flexible line the wiring harness is connected to a drum arranged outside the tube.

The pipeline networks used for the gas supply as well as the drinking water and wastewater management of cities and municipalities are usually made up of welded steel pipes. While in the case of younger pipe networks, the inside of the pipes is already factory-coated with a coating that protects against corrosion, e.g. B. are made of polyurethane, older pipes do not have such an inner protective layer and are therefore exposed to corrosine, which can lead to leaks in the course of the operating time. Such pipes are therefore often replaced by a new pipe after a long period of operation. However, relocation is time-consuming and expensive, especially if earthworks and road construction work are required. For this reason, the aim is to renovate pipes or similar elongated hollow bodies from the inside by subsequently coating the inner surface with a suitable coating. If the pipes have a sufficiently large diameter, suitable machines can be used Spraying devices are introduced and with the help of which the inner wall is provided with the necessary polyurethane coating or another coating.

It is also known to first check underground pipelines for any damage with an aggregate supported against the pipe wall. The damaged areas are then coated again with a trailing device and put in order. Such a device is known from US 4,691,728. Similar methods are known from PCT WO 96/06298 and PCT WO 96/06299. A method working on concrete is the subject of DE-OS 14 50 384. Furthermore, DE 196 41 887 AI discloses a device for the thermal internal coating of laid pipes. A motor-driven tubular vehicle is provided at one end with a rotatable working head to which a sandblasting nozzle or a welding torch is attached. The vehicle is driven through the interior of the tube, which is first irradiated with the aid of the sandblasting nozzle and then coated with a metal using the welding torch, with welding additives or other coating materials being supplied. DE 198 41 891 AI describes a coating system which can be moved in the tube, the vehicle having a distributor which applies the coating to the inner wall more or less precisely. It is therefore not possible to speak of a defined coating of the pipe, especially since the vehicle can only be moved in one direction via a rope.

The invention has for its object to provide a method and a coating system with which a definable inner coating of tubes and similar elongated hollow bodies which can be adapted to the respective conditions on the inside of the tube can be achieved.

The object is achieved according to the invention in that the vehicle is pulled through the pipe via the line and is kept at approximately the same distance from the inner wall by spacers and that the coating work of the distributor is continuously monitored and, in the event of faults, immediately afterwards by reworking Determination to be resolved. With a method of this type, it is first of all possible to apply a defined inner coating because it can be continuously monitored and corrected. The fact that the vehicle is moved through the pipe via the wiring harness and only via the wiring harness ensures that the wiring harness in which the various components are pumped from the storage containers to the place of use is always kept taut so that it does not malfunctions due to kinking or the like can occur. The vehicle and thus the distributor are always held in the center of the pipe or duct, so that it is ensured that the mixed components or the corresponding material leaving the distributor always have to travel the same route and therefore lay down evenly on the inner wall. Although the vehicle is pulled in the direction of travel via the wiring harness, it can also be pulled in the opposite direction by suitable devices, so that errors found during monitoring can be remedied immediately, ie without having to travel long distances. This ensures a consistently uniform coating or securing of the inner pipe wall.

According to an expedient design, it is provided that the cable harness connected to the vehicle is designed to be tension-resistant and is guided at the deflection points via a predetermined deflection angle to secure rollers. The wiring harness is thus secured against any kinking or any other interference and, above all, can cause the vehicle to move evenly, which is why the tensile strength training is additional.

The cable harness carrying the various components and thereby also compressed air and electricity remains unaffected when rolling up and down because the cable harness also has a corresponding stability as in the tensile strength design. In addition, however, it is also additionally provided that the wiring harness that moves the vehicle is rolled up and unrolled on a drum that serves as the drive and always remains connected to the coating agent reservoir. This special procedure ensures that even if the distributor is parked for a short time or the vehicle comes to a standstill immediately after moving the vehicle the coating process can be resumed. The necessary coating material is always available, but of course the other components are also available.

It was pointed out earlier that the vehicle can not only be advanced in the working direction via the wiring harness, but also in the opposite direction in order to be able to remedy faults at short notice. To this end, it is additionally provided that the vehicle is connected at the end opposite the wiring harness connection to a traction cable which is connected to a drive drum. In this way, the vehicle can be pulled in the opposite direction for a short time, if this turns out to be necessary due to the monitoring, in order to remedy the errors thus identified at short notice.

To carry out the method, a coating system is provided for the coating of pipes and similar elongated hollow bodies, which is equipped with a distributor for the vehicle having the coating agent, which is guided by means of a drive along the inner wall of the pipe and which is equipped with at least one via a flexible wiring harness Coating agent storage container is connected, the wiring harness being connected to a drum arranged outside the tube, the drum according to the invention having a drive and having a central, tubular drum axis, the at least one free end of which is provided with a sealed rotary connection, at the fixed end of which Part at least one feed line from a coating storage container and to the part rotating with the drum one of the product lines running in the line string is connected, which, if necessary, together with further for the n Operation of the vehicle, which can be unwound on the drum and forms the tensile cable harness, is summarized therein, with the vehicle being assigned a camera carriage and a pull cable on the side having the rotating distributor. This creates a coating system that can be pulled in one direction through the pipe or the underground duct evenly and without disruption to the drum equipped with the drive and the wiring harness. Since the drum is arranged on the ground, special safety Measures that would otherwise have to be observed in the sewer are not to be observed here. The drive can thus be carried out very simply. A direct and permanent connection between the vehicle and the distributor via the wiring harness with the coating agent reservoir is possible via the rotary connection. The same naturally applies to several such storage containers. The wiring harness itself is designed to be tensile so that there can be no elongations and therefore irregular movements for the vehicle. On one side the vehicle is connected to the wiring harness and on the opposite side to a traction cable, where a camera trolley can also be arranged, which continuously monitors the coating process and ensures that in the event of errors, such as uneven coating or missing coating sections, immediately the vehicle is stopped and pulled in the opposite direction in order to remedy the fault immediately and in a monitored manner. This means that such a pipe or channel can be coated with the necessary certainty in one work process so that it is then immediately available again for the intended purpose.

In order to ensure a constant winding or unwinding of the cable harness on the drum in the long term and also in the case of several winding operations, the invention provides that the drive of the drum and the drive of an upstream pair of pressure rollers are matched to one another by means of an electronically coordinated electronic drive and the winding speed Control. In the long run, the driven drum can be used as the exclusive drive for the vehicle that can be moved in the sewer or pipe, the upstream pair of pressure rollers ensuring both a smooth winding and unwinding as well as a uniform feeding of the wiring harness.

According to a development, it is provided that two pairs of pressure rollers arranged one behind the other in the pulling direction are provided, of which one pressure roller is driven, while the other pressure roller is designed to follow the friction surface with the lateral surface of the cable harness, the drive of the drum being opposite to the drive of the Pressure roller pairs tracking working drive and at least one pressure roller pair parallel to the drum axis, preferably is designed to be movable over a carriage. Thus the cable strand is rolled up and down evenly, whereby a uniformly charged cable strand is also ensured between the drum and pressure roller pairs, but at the same time the winding is favored because the pressure roller pairs move back and forth over the carriage in front of the actual drum The cable harness can always be rolled up close to one another on the drum or can be unrolled from it.

The uniform spacing of the distributor from the inner wall is ensured because the vehicle has a housing with six or more radially protruding skids that are supported on the inner wall of the tube, the contact surface of which can be adjusted to the longitudinal central axis of the vehicle. The necessary adaptation to changing pipe diameters can thus also be carried out, it being entirely conceivable that the skids are also assigned rollers or other lubricants if this proves to be necessary and expedient.

A uniform coating of the inner wall of the pipe or the channel is not guaranteed by simple spraying, because the rotating distributor then too easily applies coating material to layers that have already been applied. In order to ensure the best possible coating here, it is provided that the rotating distributor, which is designed as a rotationally symmetrical pot with outlet openings, has a pipe opening into the inside of the pot as a coating agent feed, which tube is fixedly arranged relative to the housing of the vehicle and is cut off obliquely at its open end, whereby the slope points outwards to the closest area of the inner wall of the pot. The outlet openings, which are divided into at least two groups, make it possible to achieve a sufficient coating thickness even at critical points on the inside of the tube, for example in steps, projections or inward burrs. With regard to this effect, it is particularly advantageous if the outlet openings of the first group are inclined forward with respect to the longitudinal axis of the vehicle or pipe and the outlet openings of the second group are inclined rearwards with respect to the longitudinal axis of the vehicle or pipe are. In this case, for example in the case of burrs pointing inwards on the inner tube wall, the corners which are directed rearward with respect to the direction of travel become these Burrs are reached by the coating agent jet directed towards the front, whereas the corners facing forward in the direction of travel are detected by the coating agent jet directed towards the rear, so that overall a sufficient coating can be produced even at such critical points. The outlet openings are preferably essentially cylindrical bores in the material of the distributor. The holes enable a coating jet that is precisely defined with regard to its exit angle. The rotationally symmetrical pot of the distributor prevents an uncontrolled delivery of coating agent because the diameter of the inner wall at the open end of the pot is smaller than at that axial section of the inner wall from which the outlet openings originate. The pipe opening into the pot ensures that the coating agent is transported in the shortest possible way to every area of the pot from which the outlet openings originate. It also prevents the coating agent from reaching areas from which it could be released in an uncontrolled manner, e.g. B. to the open edge of the pot.

Another expedient embodiment provides that the rotating distributor is designed as a spray gun with a radially arranged outlet opening and integrated mixer, and that the shaft of the rotary drive rotating the spray gun is designed to have a medium bushing or to result in it. This makes it possible, for the first time, to apply the coating in a targeted manner and in terms of its volume, virtually continuously, without the risk that the coating material will drip or run off if it is applied too thickly or applied twice through the nozzles. Rather, the spray gun hits an exact amount of coating material or two-component mixture on the inner tube wall, which then practically spirals the coating, because the vehicle can be moved evenly in the longitudinal direction of the tube. Thanks to the special design, it is possible to choose the layer thickness so that when the coating is reconnected after the spray gun has been rotated, the two-component mixture has cured to such an extent that it is no longer possible to drain or run off. It is particularly advantageous, however, that with a spray gun according to the invention the coating process at any time can be interrupted because the mixing of the two components only takes place in the spray gun and in the front of the head, so that after a corresponding standstill the coating can generally be continued without problems. This can also be achieved, for example, by using the compressed air that is carried along anyway to clean the gun, so that the completely cleaned spray gun is then available for resuming the spraying process. This makes it possible, for example, to apply the coating in sections, and thus only in the areas where there is damage, in order to then move the entire vehicle to the next place and resume the spraying process there. For the first time, it is now possible to spray in sections without moving back and forth over several meters or even more than 100 meters, as liner or the like. does not have to be used.

According to a further expedient embodiment of the invention, it is provided that the medium bushing is designed as a cylinder housing arranged in the longitudinal direction of the tube with the component connections for the two components and the compressed air connection, the shaft connected to the compressed air rotary drive, which is connected to the connections, being arranged in the cylinder housing has correspondingly formed outer ring channels and axial blind bores. As already mentioned above, the two-component and also the compressed air are introduced into the rotating spray gun via the medium feed-through without the line string being overloaded. In the pipeline, the two components and the compressed air are gently brought from the over-the-day distribution station to the place of use in the pipe, in order to then be introduced through the medium duct into the spray gun to be mixed and sprayed there. As can be seen from the features of the claim, the components can really be conveyed separately up to the mixing location, whereby they are brought up to the handle of the spray gun through the medium passage. Advantageously, the compressed air, which is also required for other purposes to be explained further below, is used to turn the shaft and thus the spray gun. The speed of rotation can be adjusted so finely using compressed air that the uniform application effect described above is always reliably achieved. The vehicle is moved in the pipeline or in the sewer via the windable cable harness. On the one hand, in order to enable an exact positioning of the vehicle in the pipe and, on the other hand, in order to be able to make corrections, the invention provides that a rotatable cable attachment for a counter-pulling cable is provided at the free end of the spray gun. The counter-pulling rope yields to the extent that the vehicle can be moved in the direction of travel, but can also be activated to the extent that the vehicle moves back or is retracted within the intended framework. Stress on the counter-pulling cable is avoided because a rotating head is provided between the rotating spray gun and the counter-pulling cable, so that the spraying gun rotates without this movement being able to be transmitted to the counter-pulling cable.

The described wiring harness can advantageously perform its double function in that, with the separate, heatable product lines, it consists on average of two half-shells and an intermediate piece, in which channels or partial channels for the product lines and the further supply lines are left out. This means that a sufficiently stable jacket can be placed around the product lines and the supply lines, which ensures that the necessary tensile forces can be transmitted, but at the same time that the internal lines are insulated, which ensures that the coating system operates properly. Only if the two products can be brought to the place of use at the right temperature is a correspondingly quick and safe curing on the inside of the pipe or duct wall necessary and possible. The channels for the product lines are expediently provided in the lower half-shell. The other supply lines are either arranged around the product lines or, above all, the upper half-shell, so that after integrating the corresponding lines, the two half-shells and the middle intermediate piece are simply placed one inside the other and then fixed in such a way that uniform operation of the entire coating system is ensured . To connect the two half-shells integrating or enclosing the intermediate piece, it is provided that the two half-shells are connected to one another via a tongue and groove connection, fixing the intermediate piece and the product and supply lines. The tongue and groove connection can be easily completed, usually using adhesive material or similar. is entered into the groove, a simple and secure connection is possible when inserting the tongue. It is also conceivable that the tongue and groove are shaped to match one another, so that a first fixation is already achieved when they are folded together.

A further embodiment of the invention provides that the rotating distributor has a radially arranged and discharging outlet opening, to which an air atomizing nozzle is assigned, which is equipped with an air adjusting nut which influences the spray angle of the medium outlet. Using a rotating distributor designed in this way, it is possible to place an air jacket around the respective coating jet on the basis of the associated air atomizing nozzle, which air jacket thus specifically guides the two-component mixture down to the inner wall of the pipe to be renovated. Because of the coating, it is also difficult to spray off the two-component mixture. Depending on the design of the air ring duct surrounding the coating jet, it is also possible to work in a targeted manner in such a way that the air duct expands upon impact or shortly beforehand in such a way that material which may still be sprayed off can be prevented. Advantageously, the spray angle can be changed in each case by the air adjusting nut, specifically as the circumstances require. If, for example, the distance between the outlet opening and the inner pipe wall is small, it is generally advantageous if a large spray angle is used, while the larger the distance, the smaller or smaller the spray angle is in order to direct the medium jet down to the inner pipe wall. It is conceivable that the air adjusting nut is either set remotely or manually before entering the area to be renovated, so that the air jet can be set as accurately as possible.

It is also provided that the rotating distributor consists of a support tube connected to the spray head of the spray gun with an internal mixer, an angled tube with the outlet opening and the air adjusting nut, with a further one extending into the outlet opening in the end piece of the angled tube facing the inner wall Mixer and the air atomizer nozzle is detachably connected to the angle tube and consists of two nozzle parts connected via a thread, of which the nozzle part arranged at the free end is designed as an air adjusting nut. The structure is accordingly simple and can also be designed so inexpensively that it can be replaced if necessary. According to an expedient embodiment described further below, it is also possible to blow out the distributor in order to prevent the two-component mixture from becoming stuck in the distributor or the support tube and the air atomizing nozzle even when the system is idle for a somewhat longer period. The simple construction of the rotating distributor described above nevertheless enables a long mixing path for the two components, so that when exiting the outlet opening, the conditions necessary for rapid adhesion and setting of the two-component mixture are fulfilled in any case. After the already mixed or premixed two-component mixture has been deflected, this material is then pressed through the second mixer and processed so intensively that the optimized "combination" already described is given in any case when it emerges from the outlet nozzle. An exchange of the air atomizer nozzle at the end of the support tube and the angle tube is possible because the air atomizer nozzle is detachably connected to the angle tube and consists of two nozzle parts connected via a thread, the nozzle part arranged at the free end being designed as an air adjusting nut. This also makes it easy to adjust the coating jet, because only the air adjusting nut, ie the nozzle part located at the free end, has to be turned on the thread in order to adjust the jet angle to suit the circumstances.

The compressed air necessary for the formation of the air jacket is expediently supplied in the shortest possible way, namely in that the nozzle part connected to the angle tube has an air connection and an air distribution space, which is connected via axial air channels to a second air distribution space in the air adjustment nut and the outlet ring channel, whereby In the area of the spray head, a connection for compressed air is provided, which is designed to provide a continuous air supply via a rotary connection and can be connected between the support tube or mixer and the medium valve. The arrangement of the air distribution spaces ensures that a uniform air jacket is created all around when exiting the outlet ring channel, so that breakouts of two-component mixture changed. The second air distribution space in the air adjustment nut is particularly important for this, it being hemispherical in shape and pointing with the lowest point towards the outlet ring channel, so that the compressed air can enter this area and exit accordingly. The result is a particularly targeted and uniform air jacket around the coating jet. It is also conceivable to change the "wall thickness" of the outlet ring channel, but the air adjusting nut would have to be equipped with an additional device. As a rule, it is sufficient if the outlet ring duct, once set or specified, ensures that a sufficiently thick air jacket is specified, whereby, of course, the speed at which the compressed air exits the outlet ring duct must also be taken into account. The rotating distributor is blown at or just before standstill so that it can be used again without any problems. The rotary connection ensures that the compressed air can be input continuously and not, for example, only when the rotary drive is at a standstill. As explained further below, this also has the advantage that the connection for the compressed air can also be used at the same time for supplying the air atomizing nozzle.

The wiring harness can advantageously be used for the supply and drive of the vehicle, in which product lines and electrical supply lines are integrated in a high-strength hose, forming the wiring harness, which is airtight at the end with a cover on the vehicle side or at the hose reel side with a cover with a connection block and at the same time pulling forces is connected in a receiving manner, the product lines carrying the two components of the coating material being introduced into the mixer arranged upstream of the outlet opening, into which a compressed air line with an air nozzle is arranged at right angles to it. With a cable harness designed in this way, it is first of all possible to supply the required product lines, supply lines and other cables or the like. pull into and store in the high-strength hose. If the 150 m or longer pipeline is to be used to pull the coating system, i.e. the vehicle through the sewer or the pipe, the pipeline or the high-strength hose is filled with compressed air and inflated to such an extent that the high-strength wall simultaneously the product lines and supply also effectively protects cables and also ensures the necessary insulation. The air in the high-strength hose keeps the product lines at a temperature as necessary because the air can act as an insulator, supported by the wall of the hose. In addition, however, the tensile forces can also be applied without the risk that the product lines and supply lines are overstressed or even impaired by these tensile forces. It is also advantageous that weight can be saved by eliminating the cable harness consisting of solid material. However, it is particularly advantageous that the production of such a protective jacket for the product lines, electrical supply lines and other lines is extremely simple, because only a high-strength hose is required, which does not require any further preparation work. It is only fixed at the ends with a cover and / or connection blocks and equipped to the extent that it can be connected to the vehicle and to the take-up reel. The coating material is pumped through the product lines to the vehicle and mixed here so that the two components can be applied simultaneously to the inner wall of the pipe or duct. There is a pressure mixture with injector effect because the mixed or premixed coating material is pressed and pressed into the outlet opening and thus into the nozzle by the compressed air flowing in at the same time, so that the coating material can be hurled or sprayed onto the inner wall with the appropriate acceleration and complete mixing . It turns out that the training described allows the two components to be mixed quickly and quickly, so that it can be worked with correspondingly small-sized facilities. The respective component material emerging from the opposite openings in the product lines is entrained by the air flow and skillfully mixed and accelerated at the same time so that it can be applied to the inner wall at the required speed without rebound effect, even with larger diameter pipes. The product lines are expediently designed to lead the coating material with its proportion of pressure. For example, the component material required in the larger quantity is pressed through the product line at 100 bar, while the component material required in the smaller quantity is conveyed to the mixer at 50 bar. By changing the pressure, the quantity can also be changed and adapted to the respective requirements, the component quantities and the pressure ratios with respect to the two product lines being simply predefined depending on the coating material used.

It was pointed out earlier that the high-strength hose is tightly connected at the end via a cover and at the same time transmits tensile forces. The necessary, also tension-proof connection between this part and the high-strength hose is ensured in that the cover or the connection block are each connected to a hose nozzle, which keeps the high-strength hose inserted far into the hose via an external toothing and with corresponding annular grooves Inclusion of an O-ring are provided. The hose nozzles with their external teeth are inserted into the hose before it is placed under compressed air. A corresponding insertion is thus possible, whereby the toothing makes it practically impossible to pull out the hose nozzles, this effect also possibly being supported by hose clamps. With a corresponding fixation of the hose nozzles in the high-strength hose, it is then possible to fix these hose nozzles to the cover or to the connection block, in particular to screw them tight. The necessary seal in the area of the cover and the connection block is achieved by the O-rings. This effectively seals the area between the cover and hose nozzle, so that compressed air cannot escape unintentionally. Rather, the hose, once pressurized or filled with compressed air, remains in its corresponding securing position, so that the other supply lines stored therein remain unaffected and protected.

The hose sealed at both ends via the cover or the connection block is to be inflated in the operating state in order to ensure the corresponding securing of the product lines, compressed air lines and supply lines and to also be able to absorb the tensile forces properly. To this end, the invention additionally provides that the cover on the hose drum side has a connection bore for a low-pressure line for the supply of compressed air, preferably from 2 to 4 bar and that the bores are equipped with a sealing coating which interacts with the outer wall of the product lines, compressed air line and supply line. Compressed air is appropriately introduced into the interior of the hose via this low-pressure line, and this can inflate because it is sealed and sealed off at both ends by the cover, so that it receives the necessary rigidity or this rigidity is maintained. The coating can of course also be assigned to the individual supply lines and the other lines, but they are actually only required in the area of the passage in the area of the bore, so that it is more expedient to equip their inner wall accordingly. The corresponding coating also has the advantage that a uniform pulling in or pulling through of the supply lines and other lines is promoted.

The cable harness used or the corresponding hose has a total length of 150 m and more, whereby it is wound onto or from an appropriate hose drum, depending on the direction in which the vehicle is moving. On the one hand, in order to be able to safely absorb tensile forces occurring and to avoid overloads, but on the other hand to optimize the flexibility of the hose as much as possible, it is provided that the wall of the high-strength hose is provided with a reinforcement, which reinforcement does not necessarily have to be spiral , but can also consist of rings, which are either fixed on the outer wall of the hose, integrated into the hose or positioned on the inside, in order to bring about the corresponding stabilization. In both the spiral configuration and the annular configuration, the hose can be wound up in any case.

The invention is characterized in particular by the fact that a method for the internal coating of pipes and similar elongated hollow bodies is created and, moreover, a corresponding coating system with which the application of the coating material is continuous and possible in such a way that those to be carried out in sections of 150 m or more Coating work an even produce a perfect result. The vehicle is pulled evenly through the pipe or duct to be coated, through the driven cable harness, the latter being tensile and pulling evenly through the duct or pipe via the specially designed drum. Loops or stakes cannot occur, so that an even supply of the vehicle and the distributor is ensured. The wiring harness is simple and can be inflated so that the product lines and supply lines arranged therein are very safe and at the same time heating is also possible, which allows the coating components to be safely brought to the distributor even over long distances. The vehicle is always guided exactly in the middle of the pipe, can be moved in both directions and allows the coating success to be checked immediately, so that any errors that occur can be eliminated very quickly and in the shortest possible way.

Further details and advantages of the subject matter of the invention emerge from the following description of the associated drawing, in which a preferred exemplary embodiment is shown with the necessary details and individual parts. Show it:

FIG. 1 shows a coating system for the internal coating of pipes in a highly simplified representation,

FIG. 2 shows a vehicle that can be displaced within a tube,

FIG. 3 shows a distributor in section,

FIG. 4 shows an interior view of the distributor,

FIG. 5 shows a front view of the vehicle,

FIG. 6 shows a section through the wiring harness,

FIG. 7 shows a side view of the drum on which the cable strand is wound,

FIG. 8 shows a top view of the drum,

FIG. 9 shows a rear view of the drum,

Figure 10 is a side view of the vehicle, partly in

Cut, FIG. 11 shows a section through the wiring harness,

Figure 12 is an exploded view. Fig. 11

FIG. 13 a distributor with an air atomizing nozzle,

FIG. 14 is a side view of a coating system with camera carriage,

Figure 15 is a rotating distributor in cross section and

Figure 16 shows a cable harness with inflatable hose.

The essential elements of the coating system are first explained with reference to the overview in FIG. 1. In the Erdrecih is a pipe 1 to be renovated, which is first divided into individual pipe sections for the purpose of renovation. The pipe sections are separated from one another by pits 2. Between each two successive pits 2 there is the pipe section to be renovated.

The pipe is refurbished by coating its inner jacket. For this purpose, a vehicle 3 is moved through the pipe 1 by pulling the vehicle 3 through the respective pipe section by means of a cable harness 4 which is resistant to wear and has low wear and is provided with supply lines for the vehicle 3, so that the vehicle 3 passes from the pit 2a to the pit 2b where the vehicle 3 exits from the pipe 1. Deflection rollers 5 are used for the gentle deflection of the wiring harness 4, which is finally wound onto a drum 7 reduced on a service vehicle 6.

On the service vehicle 6, e.g. B. a truck, in addition to the drum 7 different storage containers, for. B. two coating agent storage containers 8, of which only one container is shown in Fig. 1 for reasons of clarity. In the coating agent storage containers 8 there are products which reach the vehicle 3 via the line 4, which also serves as a flexible tension element, in order to carry out the internal coating of the tube 1 on the spot. In order to be able to pull the wiring harness 4 up to the end of the pipe 1 at pit 2a before the coating process begins, the wiring harness 4 can be temporarily connected to a pull rope 9, the other end of which is attached to a motorized winch 10. By actuating the cable winch 10, the cable harness 4 with the supply lines contained therein can be pulled to the respective pipe end by means of the pull cable 9. Then the pull cable 9 is released again, for which purpose corresponding coupling elements 43 are provided on the one hand on the wiring harness 4 and on the other hand on the pull cable 9. Then the vehicle 3 is coupled to the wiring harness 4, whereupon the coating process can then be started by precisely controlled tightening of the wiring harness 4.

Instead of a direct connection between the wiring harness 4 and the pull rope 9 via the coupling elements on both sides, it is also possible to pull the vehicle 3 already coupled to the wiring harness 4 into the pipe 1 by means of the pull rope 9 until just before the pit 2a. This case is shown graphically in FIG. 1.

Details of the vehicle 3 drawn along the inner tube wall are explained below with reference to FIG. 2. This consists of a housing with six or more skids 11 protruding radially therefrom. The skids 11 have the same angular distance from one another. The sliding skids 11 can each be adjusted in the radial direction via elongated holes 12 and corresponding screw connections, in order to be able to adjust the radial distance between the contact surfaces 13 of the sliding skids 11 and the longitudinal central axis 14 of the vehicle 3. This can be seen particularly well from FIG. 5. In this way, the effective diameter of the vehicle 3 can be adapted to the respective inner pipe diameter. Furthermore, the skids 11 are interchangeable, so that skids with a larger radial extension can be used, for example, for larger pipe diameters. The skids are provided with bevels 15 at both ends, so that trouble-free sliding along the inner tube wall is ensured. Each skid 11 is mounted on springs 16, so that a certain compensation for unevenness in the tube inner wall is possible. The length of the skids 11 is at least two thirds longer than the diameter of the tube 1. B. 300 mm in diameter, the length of the skid at least 500 mm.

An important element of the vehicle 3 is a distributor 18 in the form of a pot which is open towards the vehicle and is seated at one end of the vehicle on a centrally arranged drive shaft 17. The centrally arranged drive shaft 17, which therefore coincides with the longitudinal central axis 14 of the vehicle 3, is driven by a compressed air motor 19 at a speed of at least 15,000 to 17,000 rpm and up to 30,000 rpm. The compressed air motor 19 is supplied with compressed air via a compressed air line 20, which is part of the wiring harness 4.

In addition to the compressed air line 20, two product lines 21, 22 lead into the vehicle 3. The product lines 21, 22 are also part of the flexible line 4. The product lines 21, 22 reach a preferably heated mixer 23 within the vehicle housing. There the two products are mixed to form the desired coating agent. This reaches the interior of the pot-shaped distributor 18 via a rigid pipe 24.

As can be seen in Fig. 3, the tube 24 is offset from the central drive shaft 17 and provided at its free end with a bevel 25 between 30 ° and 45 ° through which the coating agent can escape. The bevel 25, as can be seen in FIG. 3, is directed outwards towards the closest area of the inner wall 26 of the pot.

A polyurethane coating of the inner tube wall is preferably possible with the vehicle 3. For this purpose, a product line 21 z. B. polyol, and over the other product line 22 z. B. isocyanate to the heated mixer 23.

Details of the pot-shaped distributor are explained below with reference to FIGS. 3 and 4. Apart from the drive shaft 17 made of steel, the entire distributor 18 is made of plastic or aluminum. Because of the pot shape, it is closed to the outside and is provided with an opening 27 towards the vehicle 3, which, like the entire distributor 18, is rotationally symmetrical with respect to the longitudinal central axis 14. In this way, imbalances in view of the very high speeds of the pot are avoided.

In the direction of the end wall 28 of the pot, its inner wall 26 tapers. Also towards the vehicle, i. H. 3 to the left, the inner wall is designed as a cone 28, which, however, tapers towards the opening 27. The diameter of the inner wall 26 is therefore smaller at the open end of the pot than at that axial section of the inner wall from which outlet openings 29, 30, 31 originate. The outlet openings 29, 30, 31 start from a common circle 32 defined on the inner wall 26 of the pot. For a better illustration, the circle 32 is shown in broken lines in FIG. 3.

The outlet openings 29, 30, 31 are essentially cylindrical bores in the plastic material of the distributor 18. The outlet openings 29, 30, 31 are divided into a total of 3 groups:

A first group of outlet openings 29 is inclined forward with respect to the longitudinal central axis 14, which results in the coating jet 29a. A second group of outlet openings 30 is inclined rearward with respect to the longitudinal central axis 14, resulting in a coating jet 30a. Finally, a third group of outlet openings 31 is aligned exactly radially, so that a coating jet 31a directed at right angles to the longitudinal central axis 14 is established.

FIG. 4 shows that the outlet openings 29, 30, 31 can have different outlet angles even when viewed in a cross section of the pot. While one outlet opening extends radially and leads to a radial coating jet ee, other outlet openings are arranged tangentially, as a result of which a tangential coating jet 34 is set in each case.

All outlet openings 29, 30, 31 are evenly distributed over the circumference of the pot, the ratio between the number of outlet openings 29, 30, 31 as 1: 1: 2.

Due to the different inclination of the three outlet openings 29, 30, 31, three axially offset circles are defined on the outer circumference of the distributor, which are provided with the reference numerals 35, 36 and 37 in FIG. 3, and the axial locations of the mouth of the outlet openings Designate 29 or 30 or 31.

In operation of the vehicle, the coating agent passes through the pipe 24, which is fixedly arranged in the housing of the vehicle, to the bevel 25 and from there it comes against the inner wall 26 of the pot rotating at high speed. In this way, the material is distributed evenly over the inner circumference of the pot and, due to the very high centrifugal forces, exits through the outlet openings 29, 30, 31, so that the coating material is thrown against the inner wall of the surrounding pipe and adheres there.

FIG. 6 shows a section through the line 4 with the product line 21 for polyol, the product line 22 for isocyanate and the compressed air line 20. The two product lines 21, 22 together form the supply line leading to the mixer 23. Both product lines 21, 22 are each provided with their own heating. This consists of an inner Teflon tube, a current-carrying metal braid 38 arranged around the Teflon tube and an outer protective tube, which in turn is embedded directly in a vulcanized rubber sheath 39 of the wiring harness 4.

The supply line is heated in sections, for which purpose a corresponding number of feeds 40 are embedded in the rubber casing 39. Also embedded are sensor lines 41 for controlling the individual heating sections to a precisely specified temperature.

The rubber sheathing 39 of the wiring harness 4 is made of a relatively tensile material, so that the pulling force required for conveying the vehicle through the pipe can be applied via the wiring harness without it can damage the various lines in the wiring harness.

The cable strand 4 is wound onto the drum already described, for which reference is made below to FIGS. 7 to 11. However, the pulling force required for tightening the cable harness 4 is not applied by a drive of the drum 7, but by a separate pulling drive composed of pairs of rollers 42. 1 only shows a single pair of rollers 42, whereas in the embodiments according to FIGS. 7 to 9 there are a total of two pairs of rollers 42. Each pair of rollers 42 is composed of a driven pressure roller 44 and a further pressure roller 45 which, as a result of the frictional engagement, runs along with the lateral surface of the line strand 4. As can be seen in FIG. 7, the two pressure rollers 44 can be operated via a common drive 46 via corresponding drive belts.

The drum 7 is also provided with a drive 47, preferably also by means of a drive belt 48. A suitable electronic control ensures that the winding speed of the drive 47 operates at the same speed at which the pairs of rollers 42 transport the wiring harness 4. In order to control the speed as finely as possible, however, the wiring harness 4 is tightened exclusively via the pairs of rollers 42, which, owing to their small diameter, permit very precise speed control with a high pulling power at the same time. The drive 47 of the drum 7 operates only as a tracking drive.

FIG. 8 shows that the individual turns of the wiring harness 4 are wound onto the drum 7 lying side by side. In order to avoid an overlap of the individual windings, the roller pairs 42 are located on a slide 50 which is movable parallel to the drum axis 49. The movement of the slide 50 parallel to the drum axis 49 is coordinated with the conveying speed of the pressure rollers 44, ie the slide 50 works with such a roller Speed that the individual turns of the wiring harness 4 lie exactly next to each other on the catch the drum 7 are wound. For this purpose, the drive of the carriage 50 is coupled to the drive 46 of the pressure rollers 44 via a gear 51.

Both the driven pressure rollers 44 and the non-driven pressure rollers 45 can be provided with a friction-increasing tread so as to exert a higher frictional and thus tensile force on the wiring harness 4.

Since the wiring harness 4 with the lines and supply lines contained therein inevitably ends in the drum 7, rotary unions are required there. FIG. 9 shows that the drum axis 49 is provided at both ends with rotary connections 52, 53 which are sealed out of the drum axis. Supply lines are connected to the fixed part of the rotary connections, the supply lines 54 leading to the coating agent storage containers 8. Connected to the part of the rotary connection 52 rotating with the drum is a double line which initially leads along the drum axis 49 and which is then continued in the product line 21 or the other product line 22 of the wiring harness 4.

The compressed air for the compressed air motor is also supplied via a corresponding rotary connection 53. Finally, rotary contacts 55 are provided, via which the current supply to the heating sections and the tapping of the electrical sensor lines 41 take place.

Figure 10 shows a tube 1 in cross section, in which a vehicle 3 can be moved evenly. The only indicated line 4 serves for this purpose, which at the same time also serves to introduce the required media or components. Not shown is a deflection roller, which leads through the pipe 1 to a vertical channel, in order to be redirected here for days or into the area of the road, where a service vehicle, also not shown, is located, on the drum of which the cable harness 4 is then wound becomes.

The vehicle has a plurality of skids 11, 93, preferably six such skids, which can be attached to the telescopic skid brackets 94 Inner wall 58 are pressed. The telescopic skid bracket 94, which has springs (not shown), is acted upon by pressure rollers 95, which can be pivoted via expansion pneumatic cylinders 96 in such a way that they either move the skids 11, 93 against the inner wall 58 or else enable the telescopic skid bracket 94 to be pushed back in.

With 18 a distributor is designated, which is designed here as a spray gun 60, which is rotated continuously on the shaft 61 via the rotary drive 62. The rotary drive 62 is equipped with a compressed air motor 19, which is supplied with the necessary energy via the compressed air line, which will be discussed further below. The compressed air line is designated 20, while the product lines leading to the components are provided with 21 and 22. The mixer, which has a special shape here, bears the reference symbol 23 ', it being located in the head region of the spray gun 60. The outlet opening is designated 29, from which a coating jet 30 emerges and is directed uniformly onto the inner wall of the tube.

The entire vehicle 3 is slidably moved on the skids 11, 93 via a drive 46, not shown, mostly in the form of the corresponding drum. During the process, the two components and the compressed air enter the vehicle 3 via the line 4, where they are introduced into the rotating component via the medium passage 64 shown in FIG. 1 and FIG. For this purpose, the medium bushing 64 has an elongated cylinder housing 65 with the component connections 66 and 67 and with the compressed air connection 68. The compressed air connection 68 is connected to the compressed air rotary drive 69, this being indicated here in the form of the compressed air motor 19. In any case, this compressed air rotary drive 69 ensures that the shaft 61 rotates smoothly and moves the spray gun 60 at the same time, so that the coating jet 30 gradually acts on the wall of the tube 1. The compressed air passes through the outer ring channel 70 and the axial blind bore 71 into the spray gun 60, but also to other components which are to be regulated or controlled via compressed air. The two component connections 66, 67 are connected to the outer ring channels 72 and 74 and guide the respective component via axial blind holes 73 and 75 to the spray gun 60, where in the Mixer 23 'is a mixture of the two components.

The respective outer ring channels 70, 72, 74 are partitioned off from one another by means of the sealing rings 77 arranged in the respective annular groove 76, which bear tightly against the inner wall 78 of the cylinder housing 65. The inner tube wall 89, i.e. H. the inner wall of the inner cylinder housing part 65 is smoothed to such an extent that an effective seal is ensured via the sealing rings 77.

In the area of the end radial wall 79, buffer chambers 80, 81 are formed on both sides. These buffer chambers can be provided in order to reduce the weight of the entire device, but they can also be connected to the compressed air generator, i. H. are connected to the compressed air connection 68 in such a way that this area is continuously under pressure, so that at the same time this also ensures that the components or other parts cannot get into the area of the rotating shaft 61. By the way, 63 denotes the ball bearing, which is intended to ensure a uniform rotation of the shaft 61 in the cylinder housing 65.

The cylinder housing 65 consists of two flange tubes 82, 82 ', the flanges 83, 83' of which are used to effectively connect the two parts. The corresponding screw connection is indicated, the outer flange tube 82 'having a corresponding flange 83' on both sides, while the inner flange tube 82 is only equipped on one side with a flange 83. A special flange 83 ″ is used on the opposite side in order to connect the two components to one another. The same is shown in particular in FIG. 10. Here it can also be seen that the outer sides 84 of the sealing rings 77 seal off a chamber 85 and 86, respectively, which are fitted with compensating bores 87, 88 If component materials volatilize in these chambers 85 or 86 due to leaking sealing rings 77, these can be easily removed through the compensating bore 87, 88.

The shaft 61 is rotated via the rotary drive 62 or the compressed air rotary drive 69, a cable fastening 93 for the counter-pulling cable 92 being attached to the free end 90 of the spray gun 60. This rope attachment 91 is one Turret that prevents the counter-pulling rope 92 from twisting. This counter-pulling rope 92 initially enables the vehicle 3 to move evenly and at the same time makes a correction if the spray gun 60 should not start in the correct position for spraying. The entire vehicle 3 can then be moved back into a correspondingly correct position via the counter-pulling cable 92.

The skid bracket 94 is designed to be telescopic. The pressure rollers 95 are either brought into a spreading or a relief position via the welding pneumatic cylinder 96, so that both a fixing of the vehicle 3 to the inner wall 58 of the tube 1 is possible as well as a correction if the shaft 61 or the Spray gun 60 should not be exactly in the corresponding predetermined position that it needs to ensure a uniform spraying of the two components onto the inner wall 58.

Figures 11 and 12 show a wiring harness 4 in section. The wiring harness 4 consists of the two half-shells 98 and 100, which are connected to one another via a tongue and groove connection 108, 109, including an intermediate piece 99. Both the half-shells 98 and 100 and the intermediate piece 99 have channels 101, 102 or subchannels 103, 104, 105 are formed, in which the product line 21, 22 as well as the pressure line 20 can be accommodated, as well as further supply line 106. By choosing an appropriate material, it is possible to apply both the necessary tensile forces via the line strand 4 as well as the corresponding insulation that is required to form the product lines 21, 22 so that the two components can be conveyed to the spray gun 60 at the appropriate temperature.

The assembly is facilitated by the special design according to FIG. 11 and FIG. 12, wherein after inserting the product line 21, 22 and also the compressed air line 20 and further supply lines 106, the two half-shells 98, 100 are simply pushed into one another, for which purpose they are tongue and groove - Have connection 108, 109. This tongue and groove connection 108, 109 can also be designed in such a way that a first latching already takes place due to the shape, which then for example, by injecting an adhesive or a plastic material into a permanent connection.

13 shows a coating system which is intended for the rehabilitation of a pipe 1, here in the form of a duct. A distributor 18 is provided for coating the inner wall 58 of the tube 1 and forms the end of the spray gun 60. This spray gun 60 or the distributor 18 is set in rotation via a rotary drive 62, so that the coating jet 30 emerging from the outlet opening 29 can always be applied axially to the inner wall 58. A mixer 23 is accommodated in distributor 18 in order to sufficiently mix the two components of the two-component mixture in such a way that they can be applied to the inner wall 58 as a fast-curing resin or polyurethane. The inflow is regulated via the media valves 115, 116. With 113 the spray head of the spray gun 60 is designated.

The distributor 18 initially has a support tube 117 assigned to the spray head 113, in which the mixer 23 is arranged. When leaving the mixer 23, the two-component mixture then reaches the area of the second mixer 120 via the angled tube 118 with the aerodynamically shaped inner walls 119. The second mixer 120 ensures that the two-component mixture is now in an optimal composition or better said in the subsequent mixing cheapest mixture emerges from the outlet opening 29 in the area of the air atomizing nozzle 110.

The air atomizing nozzle 110 has an air adjusting nut 112 with a correspondingly changing medium outlet 111.

In the event of malfunctions or shortly before the distributor 18 is switched off, compressed air can be fed via the connection 114 into the distributor 18 and thus the support tube 117 and the angle tube 118 in order to express the remaining parts of the two-component mixture and thus prepare the distributor 18 for a new use.

The air atomizing nozzle 110 consists of a fixed to the angle tube 118 connecting nozzle part 122 and the displaceable or rotatable nozzle part 123. For this purpose, both nozzle parts 122, 123 have a thread 124.

The required compressed air is supplied via the air connection 125 and first reaches the air distribution chamber 126 in the nozzle part 122 and then via the air channels 127, 128 into the air distribution chamber 129. This air distribution chamber 129 is in turn hemispherical, so that the compressed air is targeted to the area of the outlet ring channel 130 arrives. The exit ring duct 130 ensures that the compressed air wraps itself around the coating jet 30 in the form of an air jacket and ensures that an exit angle is created which is just optimal for the inner wall 58. A suitable arrangement of the air connection 125 is the air connection 125 ′, which is connected to the connection 114 via the connecting line 132. The connecting line 132 is correspondingly integrated into the support tube 117 and the angle tube 118.

The emerging air flow 133 forms a kind of protective and guiding jacket around the coating jet 30.

FIG. 14 shows a pipe 1 to be rehabilitated in longitudinal section, wherein a vehicle 3 which can be moved in the longitudinal direction of the pipe 1 can be seen. This vehicle 3 is pulled in the longitudinal direction via the wiring harness 4, wherein only indicated guide runners 11 ensure that it is always held in the same middle position. A rotating distributor 18 with an upstream mixer 23 is arranged in front of the head of the vehicle 3 and has an outlet opening 29 pointing in the direction of the inner wall 58 of the pipe 1. The rotating distributor 18 is shown enlarged in FIG. 15, wherein it is driven by a rotary drive 62 and is equipped with a mixer 23 in the form of a spray gun 60. A so-called Kennex mixer is shown here, although other types of rotating distributors 18 can also be used. The exit opening 29 can be seen at the end with a corresponding nozzle.

It is not shown in detail that the wiring harness 4 is a compressed air line device 20 and product lines 21, 22 and also also electrical supply lines 136 and possibly a low pressure line 137, the latter being discussed further below.

The various media that are brought in via the line 4 are led through a medium passage 64 of special construction into the area of the spray gun 60.

Coating material 135 is applied uniformly to the inner wall 58 of the tube 1 via the rotating distributor 18 and the outlet opening 29. The same can be seen in FIG. 14. Beyond the rotating distributor 18, there is the "new" wall marked with 135, which ensures that the pipe 1 or the corresponding channel can again function fully for a long time after the renovation work has been completed.

In the area already renovated, in the embodiment according to FIG. 14, a camera carriage with an objective 143 protruding in the direction of the rotating distributor 18 can be seen. This camera carriage 142 is connected to the rotating distributor 18 via a rotating frame 140, so that it rotates simultaneously with the latter. The exit opening 29 can thus apply coating material 135 to the inner wall 58 without being obstructed by the rotating frame 140. A corresponding connection 141, which ensures rotation, is quasi connected to the rotary drive 62. The camera carriage 142 is in turn attached to the rotating frame 140 by means of a rotating eyelet 145, so that the rotating frame 140 can rotate without influencing the position of the camera carriage 142. At the opposite end of the camera carriage 142, a pull rope 144 is attached, so that the camera carriage 142 and thus the entire coating system can also be pulled back into the already renovated area of the pipe 1. This makes it possible to rework the wall if this turns out to be necessary for some reason.

The wiring harness 4 has a hose 138 forming the outer wall, details of which can be found in particular in FIG. 16. Here is the entire line 4 reproduced, which can have a length of 150 m and more. The wall 139 of the hose 138 is dimensioned such that the necessary tensile forces can be taken over. On the other hand, it is also possible to inflate between the cover 148 on the vehicle side and the cover 149 on the hose drum side. The hose drum-side cover 149 is supported via the connection block 150, so that an effective attachment to the hose drum, not shown here, is possible.

Figure 16 also shows the front part of the rotating distributor 18. The compressed air line 20 and the product lines 21, 22 open into a front head, i. H. into the mixer 23, the two product lines 21, 22 opening exactly opposite one another. The mixer has a spherical mixing chamber 153 into which the individual connecting pieces 154, 155 and the compressed air line 20 open. Opposite the compressed air line 20, a nozzle line 56 leads to the outlet opening 29 with a corresponding nozzle, which is not to be explained further here, so that the components of the coating material 135 flowing in via the connecting pieces 154, 155 are mixed intensively in the spherical mixing chamber 153 and then via the out of the Air jet 152 emerging air jet entrained and discharged through the outlet opening 29. The material mixed intensively with one another is then applied to the inner wall 58 in a corresponding jet, depending on the nozzle.

The hose identified by 138 is connected via hose nozzles 157, 158 to the cover 148 on the vehicle side or the cover 149 on the hose drum side with the connection block 150, these hose nozzles 157, 158 with their external teeth 159 being inserted correspondingly far into the hose 138. The shape of the external toothing 159 is shown in particular in FIG. 8, it being evident that after the corresponding hose nozzle 157, 158 has been inserted into the hose 138, retraction is practically impossible, in particular when the hose 138 is inflated. Hose clamps are not shown, which are also intended to prevent this involuntary pulling back or pulling out of the hose 138.

The hose nozzles 157, 158 have connecting screws 170 with Once they can be connected to the connection block 150 or the corresponding covers 148, 149. An O-ring 162 is arranged between the connection block 150 and the cover 148 on the vehicle side, for which purpose an annular groove 160, 161 is made in both parts. In the assembled state, the O-ring 162 is fixed in such a way that compressed air cannot escape under any circumstances.

The individual covers 148, 149 are equipped with bores 163, 164 for receiving the product line 21, 22 or the compressed air line 20 or the other lines 136, 137. As a result, the corresponding lines are bundled or arranged in the hose 138, where there can be no adverse or even harmful twists and overlaps if the hose 138 is filled with compressed air and inflated. For this purpose, the low-pressure line 137 is provided, which, as can be seen, leads into the area of the hose 138. Compressed air is input via this low-pressure line 137, so that the hose 138 inflates and then provides for appropriate securing and insulation of the lines 20, 21, 22, 136, 137. Because the corresponding lines in both covers 148, 149 are routed identically, a correspondingly clear arrangement of these lines within the hose 138 is ensured even with lengths of 150 m and more.

The low-pressure line 137 is led through the connection bore 165, wherein a coating 167 can also be provided in the connection bore 165 but also in the bores 163, 164, which coating corresponds to the outer wall 166 of the lines 21, 22, 20, 136. This also ensures an effective seal and an advantageous fixing of the individual lines in this area.

The hose 138 can have a reinforcement 168 in order to bring about an additional reinforcement of the hose 138. The reinforcement 168 does not hinder the rollability of the hose 138. The reinforcement 168 can be arranged on the outer jacket, on the inside or in the wall 139 of the hose 138. It can be designed in a ring or in a spiral.

The low pressure line is marked with 137 but also with 169 in order to lent to make it possible to work with 2 to 4 bar but also with higher pressures if this proves necessary.

All of the features mentioned, including those that can be seen in the drawings alone, are regarded as essential to the invention, alone and in combination.

Claims

claims

1. Process for the inner coating of pipes and similar elongated hollow bodies via a vehicle with distributor that can be moved longitudinally in the tube, the components of the coating agent being carried separately to the distributor in a common wiring harness, then mixed intensively and as a mixture in the direction of pull behind the vehicle onto the inner wall of the pipe are applied, characterized in that the vehicle is pulled through the pipe via the wiring harness and is held at approximately the same distance from the inner wall by spacers and that the coating work of the distributor is continuously monitored and, in the event of errors, these are rectified by post-processing immediately after determination .

2. The method according to claim 1, characterized in that the wiring harness connected to the vehicle is designed to be tensile and is guided at the deflection points over a predetermined deflection angle securing rollers.

3. The method according to claim 1, characterized in that the line of wire moving the vehicle is guided up and down on a drum serving as a drive and always remains connected to the coating agent storage container.

4. The method according to any one of the preceding claims, characterized in that the vehicle is connected at the end opposite the wiring harness connection with a traction cable which is connected to a drive drum.

5. Coating system for the inner coating of pipes (1) and similar elongated hollow bodies for performing the method according to claim 1 to claim 4, with a by means of a drive along the inner wall (26) of the tube (1) guided, a distributor (19) for the vehicle (3) having coating agent, which is connected to at least one coating agent reservoir (8) by means of a flexible line (4), the line (4) being connected to a drum (7) arranged outside the tube (1), characterized in that the drum (7) has a drive (47) and has a central, tubular drum axis (49), the at least one free end of which is provided with a sealed rotary connection (52, 53), at least one of which is on the fixed part Supply line (54) from a coating storage container (8) and at its rotating part with the drum (7) one of the Pro running in the wiring harness (4) Duct lines (21, 22) are connected, which, if necessary, are combined together with other cables required for the operation of the vehicle (3), which can be wound up on the drum (7) and form the tensile cable line (4), and on the vehicle (3) a camera carriage (142) and a traction cable (144) can be assigned to the side having the rotating distributor (19).

6. Coating system according to claim 5, characterized in that the drive (47) of the drum (7) and the drive (46) of an upstream pair of pressure rollers (42) have a uniform passage on the one hand and the winding speed on the other hand coordinating electronic control.

7. Coating system according to one or more of the preceding claims, characterized in that two pairs of pressure rollers (42, 42 ') arranged one behind the other in the pulling direction are provided, each of which a pressure roller (44) is driven, while the other pressure roller (45) as a result of Frictional engagement with the outer surface of the cable strand ges (4) is designed to move along, the drive (47) of the drum (7) as a drive that tracks the drive (46) and at least one pair of pressure rollers (42, 42 ') parallel to the drum axis (49), preferably via a slide (50) is designed to be movable.

8. Coating system according to one or more of the preceding claims, characterized in that the vehicle (3) has a housing with six or more radially protruding skids (11) which are supported on the inner wall of the tube and whose contact surfaces (13) to the longitudinal central axis (14) of the vehicle (3) are adjustable.

9. Coating system according to one or more of the preceding claims, characterized in that the rotating distributor (18), designed as a rotationally symmetrical pot with outlet openings, has a pipe (24) opening into the inside of the pot as a coating agent supply, said tube (24) relative to the housing of the vehicle (3). is fixedly arranged and cut obliquely at its open end, the bevel (25) pointing outwards to the nearest region of the inner wall (26) of the pot.

10. Coating system according to one or more of the preceding claims, characterized in that the rotating distributor (18) is designed as a spray gun (60) with a radially arranged outlet opening (29) and integrated mixer (23 ') and that the spray gun (60) rotating shaft (61) of the rotary drive (62) having a medium bushing (64) or is designed to result.

11. Coating system according to one or more of the preceding claims, characterized in that the medium bushing (64) is designed as a cylinder housing (65) arranged in the longitudinal direction of the tube with the component connections (66, 67) for the two components and the compressed air connection (68), wherein The shaft (61) connected to the compressed air rotary drive (69) is arranged in the cylinder housing (65), the outer ring channels (70, 72, 74) and axial blind bores (71, 73, 75) correspondingly designed with the connections (66, 67, 68) ) having.

12. Coating system according to one or more of the preceding claims, characterized in that the wiring harness (4) with the separate, heatable product lines (21, 22) consists of two half-shells (98, 100) and an intermediate piece (99), in which channels (101, 102) or subchannels (103, 104, 105) for the product lines (21, 22) and the further supply lines (106) are left out.

13. Coating system according to one or more of the preceding claims, characterized in that the rotating distributor (18) has a radially arranged and discharging outlet opening (29) which is associated with an air atomizing nozzle (110) which is associated with a spray angle of the medium outlet (111 ) influencing air adjusting nut (112).

14. Coating system according to one or more of the preceding claims, characterized in that the rotating distributor (18) from a support tube (117) connected to the spray head (113) of the spray gun (60) with an internal mixer (23) an angled tube (118) with the outlet opening (29) and the air adjusting nut (112), whereby In the end piece of the angle tube (118) facing the inner wall (58) there is a further mixer (120) reaching into the outlet opening (29) and the air atomizing nozzle (110) is detachably connected to the angle tube (118) and consists of two via one Thread (124) connected nozzle parts (122, 123), of which the nozzle part (123) arranged at the free end is designed as an air adjusting nut (112).

15. Coating system according to one or more of the preceding claims, characterized in that the nozzle part (122) connected to the angle tube (118) has an air connection (125) and an air distribution space (126) which has an axial air duct (127, 128) second air distribution space (129) is connected in the air adjusting nut (112) and the outlet ring channel (130), a connection (114) for compressed air being provided in the area of the spray head (113), which ensures a continuous air supply via a rotary connection and between the support tube (117) or mixer (123) and medium valves (115, 116) can be connected.

16. Coating system according to one or more of the preceding claims, characterized in that product lines (21, 22) and electrical supply lines (136) are integrated in a high-strength hose (138), forming the cable harness (4), the end of which has a cover on the vehicle side ( 148) or on the hose drum side with a cover (149) with a connection block (150) in an airtight manner and at the same time absorbing tensile forces, the product lines (21, 22) leading the two components of the coating material (135) into the outlet opening (29) upstream mixer (23) are introduced facing each other, in which a compressed air line (20) with an air nozzle (152) is arranged at right angles to it.

17. Coating system according to one or more of the preceding claims, characterized in that the cover (148, 149) or the connecting block (150) are each connected to a hose nozzle (157, 158) which connects the high-strength hose (138) via a External teeth (159) are arranged to hold and inserted far into the hose (138) and are provided with corresponding ring grooves (160, 161) for receiving an O-ring (162).

18. Coating system according to one or more of the preceding claims, characterized in that the hose drum-side cover (149) has a connection bore (165) for a low-pressure line (137) for the supply of compressed air, preferably from 2 to 4 bar, and in that the bores ( 163, 164, 165) are provided with a sealing coating (167) which interacts with the outer wall (166) of the product lines (21, 22), compressed air line (20) and supply line (136).

19. Coating plant according to one or more of the preceding claims, characterized in that the wall (139) of the high-strength hose (138) is provided with a reinforcement (168).