RU2215592C2 - Device for application of anticorrosive coat on surfaces of steel pipe lines - Google Patents

Abstract

FIELD: devices for application of protective coats on inner surfaces of steel pipes; sewer systems, water supply pipe lines. SUBSTANCE: proposed device has hollow cylindrical housing whose one end is connected with concentric pipe lines by means of threaded sleeves and sprayers are coaxially mounted on its other end. One sprayer is made in form of body of revolution which is provided with threaded section on part of lesser diameter; body of revolution on larger part is engageable with plate. Said sprayer is located in cavity of other hollow sprayer. Sprayers are engageable with housing by means of threaded sleeve and spokes. Housing, threaded sleeves and spokes are made as an integral part. Hollow spokes have open cavities which are hydraulically connected with cavity of hollow sprayer and cavity of pipe line of larger section. Pipe line of lesser diameter is fixed coaxially in cavity of pipe line of larger diameter which are radially oriented in threaded holes of pipe wall by mans of dowel pins. Cavities of spokes are oriented in center plane of housing. EFFECT: simplified construction; enhanced operational reliability; improved quality of spraying paints and varnishes ; low cost. 3 cl, 2 dwg

Description

 The invention relates to technical means for applying protective coatings on the inner surface of steel pipes and can be used in sewer systems, pipelines and other pipelines for the needs of water supply and irrigation during their construction and operation.

A device for coating on the inner surface of the pipes containing a centrifugal spray assembly of the coating material, a device for smoothing the coating and centering elements, in which, in order to reduce energy consumption, the centrifugal spray assembly is made in the form of a spray nozzle and the screen is mounted coaxially with it to rotate in the form of a facing apex towards the outlet of the spray nozzle of the cone and a curved blade evenly fixed on its surface Tei, expanding from the apex to the periphery of the cone (SU, Inventor's Certificate 1416203 A1 M.kl. ⁴ 05 C 7/02, B 05 B 13/06. Device for coating the internal surfaces of tubes / VF Zakrzewski ( USSR) .- 4082761 / 29-05; claimed 05/15/1986; publ. 08/15/1988, Bull. 30 // Discovery. Inventions. - 1988. 30).

 The disadvantages of the known device include design complexity, poor spray quality of the coating material, the inability to adjust the amount of applied material, the need for frequent replacement of smoothing blades depending on the size and diameter of the non-standard pipes, the need to change the screen design to the pipe size, the inability to supply various the chemical composition of the coating components.

The closest analogue to the claimed object is a device for applying paint to the inner surface of cylindrical casting molds, containing coaxially arranged cylindrical chambers, to the lateral surface of which are connected on a tangent line from two diametrically opposite sides for supplying paint and air, a cover with a hole in the center and a spray gun made in the form of smoothly conjugated cylindrical base, pseudosphere and plate, in which, in order to improve the quality of painting the surface of the foundry form by increasing the degree of dispersion of atomized paint on the surface of a cylindrical base and a pseudo atomizer trehzahodnaya helical groove is formed with an elevation angle 25-45 ^o, having a cross sectional shape of a circle segment; on the surface of the cylindrical base of the atomizer, the helical groove in cross section is made in the form of a semicircle with a radius equal to 0.10-0.16 of the diameter of the cylindrical base; from the interface between the cylindrical base and the pseudosphere and to the interface between the pseudosphere and the plate, the helical groove is made with a depth uniformly decreasing in length from zero and a uniformly increasing width equal to the diameter of the plate in the interface between the pseudosphere and the plate 0.942-1.046 (SU, copyright certificate 996069, M .cl ³ V 22 C 23/02, 05 V 13/06, 05 V 1/26. Device for applying paint to the inner surface of cylindrical foundry molds / V.K. Mogilev, OI Lev, Yu. G. Gulyaev and N.A. Maksimova (USSR) .- 3327138 / 22-02; claimed July 27, 1981; publ. 02/15/1983, Bull. 6 // Discoveries. Inventions. - 1983. - 16).

 The disadvantages of this device include the low technological reliability of the atomizer. Despite the fact that the grooves are made of variable cross-section, with an increase in size in the direction of supply of the coating material, the latter are clogged with paintwork. When using this device in the technical task to be solved, the quality requirements of the existing applied coatings should be increased. However, this leads to an increase in the cost of work.

 The closest analogue to the claimed object relates to a device for applying an anti-corrosion coating on the surface of steel pipelines, containing a hollow cylindrical body, one end of which is connected by means of threaded couplings to concentrically installed pipelines and coaxially located in the body and protruding at the other end of the nozzles, one of which is made in the form of a body of revolution, equipped on a smaller part with a threaded shank, and for the most part is mated with a plate, while the th sprayer is placed in the cavity of another - a hollow sprayer mated to the body by means of a threaded sleeve, knitting needles and set screws (SU, patent 3737105, M.CL. 05 V 1/14, 05 V 1/26, national class US C1, 239/423, 239/500, 239/518, 239/554, 239/568. Application 179944; claimed 13.09.1971; publ. 06.06.1973).

 Despite the fact that this device allows you to simultaneously apply two components to the inner surface of a steel pipeline, however, the technical contradiction arises in the technical problem that we solve: the first to move the device into the pipe cavity, for example, is a rust and oxide converter from the surface to be painted, but only then paintwork. In this device, the supply of these components in the described sequence (against wool) leads to a decrease in quality on the inner surface of the painted pipe due to mechanical damage by the rollers of the rod moving and centering mechanism, as well as due to poor fluidity of the rust transducer in the inter-wall space of internal and external pipelines .

 The invention consists in the following.

 The problem to which the invention is directed is the uniform application of a paint and varnish coating on the inner surfaces of pipes in a wide range of their diameters.

 EFFECT: simplified design, increased operational reliability and spray quality of a paint and varnish coating, cost reduction of work performed.

 The specified technical result during the implementation of the invention is achieved by the fact that in the known device for applying an anti-corrosion coating to the inner surface of steel pipelines, including a hollow cylindrical body, one end of which is connected by means of threaded couplings to concentrically installed pipelines and spray nozzles coaxially located in the housing on its other end one of which is made in the form of a body of revolution, equipped with a threaded section on the smaller diameter part, and on the most it is provided with a plate, said sprayer being placed in the cavity of another hollow sprayer coupled to the casing by means of a threaded coupling and spokes, according to the invention, the casing, the coupling and the spokes are made as a single part, while the hollow spokes have cavities hydraulically connected to the cavity of the hollow sprayer and the cavity large cross-section pipeline; a smaller diameter pipe in the cavity of a large diameter pipe is coaxially fixed with pins radially oriented in the threaded holes of the outer wall; the cavity of the spokes are oriented in the diametrical cavity of the body.

 Due to the fact that the housing, couplings and spokes are made as a single part, simplification of the design is achieved. The supply of the rust converter through the internal pipeline into the cavity of the device body, and the paintwork through the hollow spokes into the cavity between the mating (adjacent) sprays ensures an uninterrupted supply of components regardless of the ambient temperature, and increases the operational reliability of the entire installation. Sequential application of the components of an anticorrosive coating to the inner surface of the painted steel pipe ensures the adhesion of the material. The chemical reactions of the rust converter with metal oxides on the surface of the steel pipe contribute to a better setting of the paintwork and reduce their consumption. This achieves a reduction in the cost of anti-corrosion treatment of surfaces of steel pipelines.

 An analysis by the applicants of the level of technology for painting steel, etc., products and technical means, including a search by patent and scientific and technical sources of information and identification of sources containing information about analogues of the claimed invention, made it possible to establish that the applicants did not find an analogue characterized by features, identical to all the essential features of the claimed invention.

 Therefore, the claimed invention meets the requirement of "novelty" under the established law.

 To verify the compliance of the claimed invention with the requirement of "inventive step", the applicants conducted an additional search for known solutions in order to identify features that match the distinctive features of the claimed invention from the closest analogue, the results of which show that the claimed invention does not explicitly follow from the prior art, since from the prior art determined by the applicants, the influence of the essential features of the claimed invention is not revealed I am transforming to achieve a technical result.

 Therefore, the claimed invention meets the requirement of "inventive step" under applicable law.

 The invention is illustrated by drawings.

 Figure 1 shows a diametrical section of a part of a device for applying an anti-corrosion coating on the surface of steel pipelines.

 In Fig.2 is a section aa in Fig.1, a concentric arrangement of the cavities for supplying the rust converter and anti-corrosion coating in the device body.

 Information confirming the possibility of implementing the claimed invention are as follows.

 A device for applying an anti-corrosion coating on the surface of steel pipelines (see FIGS. 1 and 2) comprises a hollow cylindrical body 1 with threaded cylindrical couplings 2 and 3 with external pipe cylindrical threads at one end.

 The named end of the housing 1 by means of threaded couplings 2 and 3 is connected to concentrically installed pipelines 4 and 5. On the inner surfaces of the pipelines 4 and 5, cylindrical pipe threads are cut that are mated to the couplings 2 and 3. The pipeline 5 acts as a rod of the supporting element introduced by means of guides into cavities of painted steel pipelines. A smaller diameter pipe 4 in the cavity of the large diameter pipe 5 is fixed by radially oriented threaded pins 6. The pins 6 hold the inner pipe 4 equidistant from the inner wall of the pipe 5. This ensures a laminar flow of the paintwork in the pipe 5. Two nozzles 7 are coaxially located in the body cavity 1 and 8. The ends of the nozzles 7 and 8 protrude beyond the second (free) end of the housing 1. The atomizer 7 is made in the form of a body of revolution. It is equipped with a threaded section 9 on the smaller part. The majority of the nozzle 7 is paired with the plate 10. As the generatrix of the nozzle 7, we selected a parabola branch, the tip of which is removed from the geometric axis of symmetry of the nozzle 7 by half the diameter of the plate 10. The threaded section 9 the atomizer 7 is placed in the blind hole 11 of the housing 1. This eliminates the sticking of the anti-corrosion coating on the surfaces of the atomizers 7 and 8 when leaving the annular gap.

 The atomizer 7 is placed in the cavity of another hollow atomizer 8. The atomizer 8 is connected to the housing 1 by means of a threaded sleeve 12 and spokes 13.

 The housing 1, the couplings 2, 3 and 12 and the spokes 13 are made as a single part. This made it possible to make the nozzles 7 and 8 with smaller diameters than the diameter of the pipe 5. The hollow spokes 13 have cavities 14 hydraulically connected to the cavity of the hollow atomizer 8 and the cavity of the pipe 5 of large cross section. The cavity 14 of the spokes 13 are oriented in the diametrical plane of the housing 1.

 The outer and inner surfaces 15 and 16 of the atomizer 8 are formed by rotation of the parabola branches with different angular coefficients. On the cylindrical on the working protruding surface 17 is knurled for screwing in the atomizer 8 in order to change the technological annular gap Δ1 between the end cut 18 of the housing 1. The notches are made on the cylindrical surface of the plate 10 to change the clearance Δ2 between the nozzles 7 and 8.

 The cavity 19 of the housing 1 has a slight narrowing from the end of the inner pipe 4, then this section is somewhat narrowed by the spokes 13, and then gradually increases (expands) in the direction of the end cut 18 of the housing 1.

 The pipeline 4 and the cavity 19 of the housing 1 are hydraulically connected through a valve (two-way valve) with a reservoir filled, for example, with a rust converter. The pipeline 5, the cavity 20 of the housing 1 and the hollow part 21 of the spray gun 8 are hydraulically connected to the container for the paint material. The rust converter and the paintwork from the tank and tank to the nozzles 7 and 8 are supplied under excess pressure in the range from 0.02 to 0.08 MPa. The viscosity of the rust converter is greater than that of the paintwork.

 A device for applying an anti-corrosion coating on the surface of steel pipelines works as follows.

 The rod of the device through the centering rollers is introduced into the painted pipe of any diameter from 6 to 12 m long. Plate 10 is combined to another opposite cut of the painted pipe.

 From the side of the open pipe cut, the operator (painter of the corresponding discharge), first turning by knurling on the cylindrical surface 17, changes the gap Δ1, thereby achieving the proper application quality and fineness (dispersion) of the spray of the rust converter coming from the pipeline 4 of the device. The valve blocking the supply of paint to the pipeline 5 is closed at this time. Further, by manipulating the valves and nozzles in a similar way, the operator adjusts the gap Δ2 between the nozzles 7 and 8, achieving the appropriate quality and uniformity of spraying on the inner surface of the painted steel pipe.

 After performing these adjustments with both valves open, the rod with the nozzles 7 and 8 is moved along the length of the painted pipe. The rust converter, interacting with metal oxides, cleans the film from oxides to the base metal of the pipeline.

 On the surface of the steel pipe cleaned from rust and other oxides and inclusions, lay a thin layer of anticorrosive or paint coatings. This achieves a high connection (adhesion) of the protective paint to the steel surface of the pipe.

Thus, the above information indicates the fulfillment of the following set of conditions when using the claimed invention:
- a tool embodying the claimed invention in its implementation, is intended for use in land reclamation and agricultural engineering;
- for the claimed invention in the form described in the claims, the possibility of its implementation using the methods and methods described above or known prior to the priority date is confirmed;
- a tool embodying the claimed invention in its implementation, is able to ensure the achievement of considered by the applicants technical result.

 Therefore, the claimed invention meets the requirement of "industrial applicability" under applicable law.

Claims (3)

 1. A device for applying a corrosion-resistant coating to the surface of steel pipelines, comprising a hollow cylindrical body, one end of which is connected by means of threaded couplings to concentrically installed pipelines and atomizers coaxially located in the body on its other end, one of which is made in the form of a body of revolution, equipped with the smaller part of the diameter of the threaded section, and for the most part it is paired with the plate, while said sprayer is placed in the cavity of another hollow sprayer, is paired with the body by means of a threaded sleeve and knitting needles, characterized in that the body, sleeve and spokes are made as a single part, while the hollow spokes have cavities hydraulically connected to the cavity of the hollow atomizer and the cavity of the pipeline of large cross-section.  2. The device according to claim 1, characterized in that the pipeline of smaller diameter in the cavity of the pipeline of large diameter is coaxially fixed with pins radially oriented in the threaded holes of the outer wall.  3. The device according to p. 1, characterized in that the cavity of the spokes are oriented in the diametrical plane of the housing.

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