CZ36498A3 - Pipe coating apparatus and method - Google Patents

Abstract

Two spray heads (H1, H2) are present for use in lining a pipe (P1), the heads being arranged in line and arranged to apply composition in succession to the inner surface of the pipe.

Description

Technical field

The invention relates to the coating of pipes, in particular pipes for the distribution of drinking water, waste water, gas and the like. The coating is usually a synthetic resin such as an epoxy resin.

BACKGROUND OF THE INVENTION

DT-A-2,448,932, GB-A-2,218,773A and GB-A-2,065,263A disclose a pipe coating device in which an annular body applies liquid around the circumference of the coating device and to a limited extent inside the pipe. Therefore, the liquid that is in contact with the interior is inserted into it as the device progresses through the tube opening.

It is known to draw a coating device through a coated pipe, the device being equipped with a spray head and a mixer for spraying the coating composition on the surface to be coated. The coating composition, usually a resin-hardener mixture, is pumped to the head, which rotates at a rate such that the particles are sprayed and applied to the surface to be coated. In commonly used devices, the heads are generally in the form of a cylinder that rotates about its axis and applies the coating composition through the holes in its cylindrical shell. Such devices work well in the case of small diameter pipes, but do not show the necessary efficiency when the diameter is larger and / or it is essential that the coating is not interrupted.

GB-A-865,301 and DE-A-4,400,166 disclose a pipe coating device comprising a carrier adapted for movement

coated pipe, a feed line for supplying a coating composition to be applied by a spray head mounted on a support, and elements for rotating the spray head about the axis of the pipe.

GB-A-2,160,289 discloses a method of coating the interior of a pipe using a device in which the spray head is provided with three cavities arranged such that the spray material is transferred from one cavity to another and leaves the last in the form of a spray. GB-A-2,226,865 discloses a device of substantially the same type with two spray heads each forming a layer on the inside of the pipe.

SUMMARY OF THE INVENTION

The present invention relates to a pipe coating apparatus comprising a carrier adapted to move a coated pipe, a supply line of a coating composition for delivering the composition to be sprayed to a spray head disposed on the carrier, and means for rotating the spray head about the tube axis. a substantially annular surface whose axis coincides with the axis of rotation of the spray head, the surface being terminated by a side wall provided with an outer conical peripheral edge for directing the coating material to the surface to be coated.

The feed line is preferably intended to apply a film of coating material in an axial direction over the surface towards the edge.

Preferably, the device comprises two or more spray heads arranged one behind the other and intended to apply overlapping layers of coating material as the carrier moves through the coated tube.

The present invention also relates to a method of coating a tube comprising moving the spray head longitudinally with the spray head while rotating the spray head about the longitudinal axis and supplying the coating composition to the spray head rotating to spray material onto the interior of the tube. the axis of which is coincident with the axis of rotation of the spray head, the surface being provided with a side wall in that the material is fed out through the outer conical edge of the side wall.

The invention also relates to a spray head for a pipe coating device. The spray head is characterized in that the substantially disc-shaped base is provided with substantially cylindrical side walls, the peripheral edge of which extends outwards.

The sprinkler may comprise at least two sprinkler heads, each comprising a disk base provided with substantially cylindrical side walls, having a shape for directly applying the coating composition through the wall. The side wall is preferably provided with an outer conical upper part. Additionally or alternatively, the side walls are provided with openings.

For example, the head may have a diameter of from 50 mm to about 350 mm.

Further advantageous embodiments are described in the dependent claims.

BRIEF DESCRIPTION OF THE DRAWINGS

For a better understanding of the invention, a description of an exemplary embodiment will now be given with reference to the accompanying schematic drawings.

FIG. 1 shows a general view of the device according to the invention.

On giant. 2A is shown in side view of the device with two heads used in FIG . 1. On giant. 2B is shown longitudinal section taken plane IIB-IIB FIG. 2A On giant. 3 to 5 are longitudinal sections others

spray heads used in the apparatus and method of the invention.

Figure 6 is a plan view of the device of Figure 1;

DETAILED DESCRIPTION OF THE INVENTION

Where different embodiments are possible, they are used in the description of the same reference numeral with another appendix.

The coating device shown in FIG. 1 comprises a conventional air compressor and generator 1, a pump 2 and reservoirs 3, 4 of non-reinforced resin and hardener. The inlet hoses 3A, 4A from the cartridges 2, 4 are wrapped on the winding drum 5 and guided to a carrier 6 whose dimensions allow passage through the coated pipe P. The carrier 6 comprises rails 7 which may have wheels or a sliding surface to move

through the pipe P and comprises a coordinate mixer 8 to which the hoses are connected. The motor 9 is designed to rotate the spray head H formed by several spray heads H1, H2. The heads may be made of aluminum or the like.

As can be seen from FIG. 2, each head is formed by a disk 10 provided with a flange 11. The feed tube 12 from the mixer 8 extends axially through the heads and has side openings 13 near the base of each head. As seen in the figure, the inner portion of the upper portion 14 of the flange 11 is inclined and is provided with ribs 15 for receiving bolts 16 to connect one head to the other, as shown in Figure 2B, where the ribs 15 are present only on the head Hl. When the heads rotate above 10,000 rpm, the mixed resin emerging through the side openings 13 is directed, as shown by the arrow 20, over the base of the respective head and over the flange 11 being sprayed as a spatter 21 out of the peripheral edge of the flange onto the coated pipe P Since there are two heads in succession, two layers are successively applied, thereby guaranteeing an overall coating, which is particularly important when the substance conveyed by the pipe is drinking water.

In the solution shown in FIG. 2, the two heads H1 and H2 have a substantially disc base. As seen in Fig. 3, the base 10A of the head 11 can be bent to affect the passage of the coating composition. As shown in Fig. 4, three heads H1, H2, H3 may be used. wherein the ribs 15 are on the heads H1 and H2. As seen in FIG. 5, the flange 11A may be provided with holes 17 such that the spraying of the particles may take place from the sides of the head instead of or in addition to passing through the upper portion 14 of the flange.

The dimensions of the heads and / or the ratio of rotation and viscosity of the coating composition may be selected from one another to control the deposition rate

The coating in a known manner.

The coated pipe may be adjusted by interlocking and may be made of cement, plastic, metal and the like.

As shown in FIG. 6, the carrier 6 is connected by the resin and hardener supply hoses 3A and 4A and the air hose 19 to the carriage 18 on which the compressor / generator 1, the resin and hardener containers 3 and A, the winding drum 5 and corresponding pump 2 and to which other devices are connected. The air hose 19 supplies compressed air for actuating the pneumatic motor 9 on the carrier 6 and is connected to the air inlet 20.

As can be seen, the resin, hardener and air supply hoses are located on the winding drum 5 and can be controlled unwound by means of the gearbox and motor 21, clutch 22 and other gearbox 23 to carrier 6 as far as it passes through the guide winch 24, connected by pipeline to a support, not shown. The device is controlled by the control panel 27.

The temperature and thus the viscosity of the resin and hardener can be influenced by the heater 25 and the cooler 26.

The invention is not limited to a device may comprise more than three aligned after the second or second.

The depicted embodiment, head, one may be. The resin may not be epoxy.

Claims (6)

PATENT CLAIMS A pipe coating apparatus comprising a carrier (6) adapted to move a coated tube (P), a feed hose (3a, 4a) of a coating composition for supplying a spray head spray mixture (H1, H2, H3) disposed on a carrier and a means (9). ) for rotating the spray head about the axis of the tube, characterized in that the spray head (H1, H2, H3) has a substantially annular surface (10) whose axis coincides with the axis of rotation of the spray head, the surface being terminated by a side wall (11) ) provided with an outer conical peripheral edge (14a) for directing the coating material to the surface to be coated. Apparatus according to claim 1, characterized in that it comprises two or more spray heads (H1, H2, H3) arranged one behind the other and intended to apply overlapping layers of coating material as the carrier (6) moves through the coated tube (1). P). Device according to claim 2, characterized in that one spray head (H1) is provided at its mouth with a rib (15) to which another spray head (H2) is connected. A method of coating tubes according to any of the above claims, comprising a support (6) provided with a spray head (H1, H2) passing through the tube (P) while rotating the spray head about the longitudinal axis and delivering the coating composition to the spray head rotating. for spraying material onto the interior of the pipe, the spray head has an annular surface (10) whose axis coincides with the axis of rotation of the spray head, the surface (10) being provided with a side wall, such that the material is an edge (14a) of the side wall :: (11), characterized by being fed out through the outer conical (11). Spray head (H1, H2, H3) for a pipe coating device according to any one of the above claims, characterized in that it has a substantially disc base (10) provided with substantially cylindrical side walls (11), the peripheral edge ( 14a) is extended outwards. Spray head (H1, H2, H3) according to claim 5, characterized in that the ribs (15) or rim are formed on the inner surface of the side wall (11) and are adapted to receive the base (10) of the adjacent spray head.