Device and method for internal coating of a pipe

• US 20030172871A1
• Filed: 03/05/2003
• Published: 09/18/2003
• Est. Priority Date: 03/05/2002
• Status: Abandoned Application

• Current Assignee: WIWA Wilhelm Wagner Gmbh & Co. KG
• Original Assignee: WIWA Wilhelm Wagner Gmbh & Co. KG
• Inventors: Scherer, Oswald
• Application Number:
  US10/382,053
• Publication Number:
  US 20030172871A1
• Time in Patent Office: Days
• US Class Current: 118/306
• CPC Class Codes: F16L 55/1645 a sealing material being introduced inside the pipe by means of a tool moving in the pipe

Abstract

This invention relates to a method and a device (01) for coating the interior wall (14) of a pipe (02) with a curable compound, a spraying device (04) being provided on the device (01) by means of which a directed stream (10) of curable compound can be produced. A centrifugal device (05) which is driven to rotate is provided on the device (01), the stream (10) of the curable compound being directed at the centrifugal device (05), so that the curable compound is thrown by the centrifugal device (05) against the inside wall (14) of the pipe (02) because of the rotational force produced by the rotation.

Claims

1. A device (01) for coating the interior wall (14) of a pipe (02) with a curable compound, a spraying device (04) being provided on the device (01) by means of which a directed stream (10) of curable compound can be produced,

characterized in that,

a centrifugal device (05) which can be driven to rotation is provided on the device (01), the stream (10) of curable compound being directed at the centrifugal device (05) so that the curable compound is thrown against the inside wall (14) of the pipe (02) by the centrifugal device (05) due to the centrifugal force caused by rotation.

2. The device according to claim 1, characterized in that a drive motor (06) driven with compressed air in particular or something similar is provided for driving the centrifugal device (04).

3. The device according to claim 1 or 2, characterized in that the distance between the centrifugal device (05) and the spraying device (04) is variable.

4. The device according to one of claims 1 through 3, characterized in that the rotational speed of the centrifugal device (05) is variable.

5. The device according to one of claims 1 through 4, characterized in that the flow rate of the stream (10) of curable compound is variable, in particular by varying the delivery pressure.

6. The device according to one of claims 1 through 5, characterized in that the device (01) is movable along the pipe (02) by means of a conveyer device, in particular by remote control.

7. The device according to one of claims 1 through 6, characterized in that an observation unit, in particular a video camera is provided on the device.

8. The device according to one of claims 1 through 7, characterized in that the centrifugal device (05) is designed in the manner of a face wheel, which can be driven to rotate about the midpoint of its bottom (11).

9. The device according to claim 8, characterized in that the stream (10) of curable compound strikes the inside of the face wheel (05).

10. The device according to claim 9, characterized in that the stream (10) of curable compound strikes essentially the bottom (11) of the face wheel (05) and/or the drive shaft (07) coming out of the bottom (11) of the face wheel.

11. The device according to one of claims 8 through 10, characterized in that the bottom (11) of the face wheel (05) has a concave inside surface.

12. The device according to one of claims 8 through 11, characterized in that the side wall of the face wheel (05) has an angle of spread (a) of 20°

to 70°

, in particular approximately 50°

, relative to the central axis (19) of the face wheel (05).

13. The device according to one of claims 8 through 12, characterized in that the stream (10) of curable compound strikes the face wheel (05) at an angle of impact (β

) of 30°

to 70°

, in particular approximately 40°

, relative to the central axis (19) of the face wheel (05).

14. The device according to one of claims 1 through 13, characterized in that at least two material components, in particular a primary material and a curing agent suitable for it, can be mixed in the spraying device (04) to produce the stream (10) of curable compound.

15. The device according to one of claims 1 through 14, characterized in that a directed round stream and/or a flat stream of curable compound can be produced with the spraying device (04).

16. The device according to one of claims 1 through 15, characterized in that the spraying device (04) has a valve (33) which can be operated by means of a nozzle needle (26) arranged close to a nozzle orifice, and has an actuating and reset device (27, 28, 29, 30, 31, 32) for the nozzle needle (26), a nozzle channel (25) opening in the nozzle orifice in the nozzle (09) with the nozzle needle (26) displaceably mounted in this nozzle channel, and the nozzle channel (25) having at least one, in particular two boreholes (23, 24) which open into the nozzle channel (25) at the side and are used to supply components of the curable compound, these boreholes being closable by a nozzle needle (26) whose diameter is matched to the diameter of the nozzle channel (25).

17. The device according to claim 16, characterized in that the length of the nozzle channel (26) is selected so that in the resting state it is flush with the nozzle opening of the valve (33).

18. The device according to claim 16 or 17, characterized in that the valve (33) at the same time forms the nozzle opening of the spray device (04).

19. The device according to one of claims 16 through 18, characterized in that the nozzle (09), in particular the nozzle needle (26) and the component (35) forming the nozzle channel are made at least in part of a hard metal or ceramic.

20. The device according to one of claims 16 through 19, characterized in that the boreholes (23, 24) are arranged in the same plane and run essentially at a right angle to the nozzle channel (25).

21. The device according to one of claims 16 through 20, characterized in that the diameter of the boreholes (23, 24) is smaller than the diameter of the nozzle channel (25).

22. The device according to one of claims 16 through 21, characterized in that the axes of the boreholes (23, 24) are offset relative to one another.

23. The device according to one of claims 16 through 22, characterized in that the nozzle needle (26) is displaceable by means of a shaft (28) operated by a reciprocal action pressure plunger (27).

24. The device according to one of claims 1 through 23, characterized in that an element for producing a directed airflow is provided on the device.

25. The device according to claim 24, characterized in that the element for producing a directed airflow is designed in the manner of a propeller.

26. The device according to claim 25, characterized in that the propeller is mounted upstream from the centrifugal device (05) on the drive shaft (07).

27. A method of interior coating of a pipe (02) with a curable compound characterized in that a directed stream (10) of curable compound is produced with a spraying device (04),

the stream (10) of the curable compound is directed at a centrifugal device (05),

the curable compound is thrown by the centrifugal device (05) against the inside wall (14) of the pipe (02) because of the centrifugal force created by the rotation,

whereby at the same time the centrifugal device (05) and the spraying device (04) are moved with a certain rate of advance along the pipe (02) produce a coating (03) on the inside wall (14) along the pipe (02).

28. The method according to claim 27, characterized in that the curable compound cures with a pot life of a few seconds.

29. The method according to claim 27 or 28, characterized in that the curable compound is prepared by blending two material components, in particular a primary material and a curing agent suitable for it.

30. The method according to claim 29, characterized in that a two-component plastic based on polyurethane and/or polyurea is used as the curable compound.

31. The method according to claim 29 or 30, characterized in that the two material components are mixed only immediately before forming the stream in the spraying device.

32. The method according to one of claims 27 through 31, characterized in that the centrifugal device (05) rotates at a rotational speed of 2,000 rpm to 60,000 rpm.

33. The method according to one of claims 27 through 32, characterized in that the curable compound or components thereof are conveyed into the spraying device (05) at a delivery pressure of 50 bar to 500 bar.

34. The method according to one of claims 27 through 33, characterized in that the rotational speed of the centrifugal device (05) and/or the distance between the spraying device (04) and the centrifugal device (05) and/or the speed of the stream (10) of curable compound are each variable individually or jointly as a function of the desired layer thickness of the interior coating (03) and/or the pipe diameter of the pipe (02) to be coated and/or the rate of advance of the device (01) and/or the material properties of the curable compound.

35. The method according to one of claims 27 through 34, characterized in that a directed airflow is produced in the area of the centrifugal device (05), in particular by driving a propeller.