Double-property epoxy coating nodular cast iron water supply pipe

Abstract

A nodular cast iron water supply pipe with a bipolar epoxy coating comprises a nodular cast iron water supply pipe body and the bipolar epoxy coating attached to the inner wall of the nodular cast iron water supply pipe body, and the nodular cast iron water supply pipe body comprises a socket section and an equal-diameter section. The bipolar epoxy coating comprises an electrostatic spraying epoxy coating attached to the inner wall of the socket section and an air spraying epoxy coating attached to the inner wall of the equal-diameter section, and one part of the electrostatic spraying epoxy coating extends to the inner wall of the equal-diameter section and is in transition connection with the air spraying epoxy coating in a stacked mode. The electrostatic spraying epoxy coating is introduced into the socket section to solve the problems that the spraying quality of the socket section is poor and dead angles exist, the air spraying epoxy coating is reserved on the equal-diameter section, the cost is reduced, the two coatings are in transition connection in a stacked mode, large size gradient does not exist, good combination can be achieved, and the service life of the socket section is prolonged. And by using the white ceramic epoxy powder coating, the adhesive force, wear resistance and other properties of the coating are further improved.

Description

Technical Field

[0001] This utility model relates to the technical field of ductile iron water supply pipes, and in particular to a dual-effect epoxy-coated ductile iron water supply pipe. Background Technology

[0002] Applying an epoxy coating to the inner wall of ductile iron water supply pipes is a commonly used protective technique, typically using air spraying. However, ductile iron water supply pipes often have a complex-shaped socket section with varying inner diameters and numerous grooves. Applying the epoxy coating to this socket section using air spraying frequently results in uneven coating and dead zones. Furthermore, this socket section requires the installation of anchors, seals, and to accommodate the insertion end of another ductile iron water supply pipe. If the epoxy coating is not firmly adhered, it is highly susceptible to wear and tear, easily peeling off. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a dual-effect epoxy-coated ductile iron water supply pipe.

[0004] The objective of this utility model is achieved through the following technical solution.

[0005] A dual-purpose epoxy-coated ductile iron water supply pipe includes a ductile iron water supply pipe body and a dual-purpose epoxy coating attached to the inner wall of the ductile iron water supply pipe body. The ductile iron water supply pipe body includes a socket section and a constant diameter section. The inner and outer diameters of the socket section vary axially, while the inner diameter of the constant diameter section is uniform axially. The dual-purpose epoxy coating includes an electrostatic sprayed epoxy coating attached to the inner wall of the socket section and an air-sprayed epoxy coating attached to the inner wall of the constant diameter section. A portion of the electrostatic sprayed epoxy coating extends to the inner wall of the constant diameter section and transitions into contact with the air-sprayed epoxy coating in a layered manner.

[0006] As described above, in a dual-electrode epoxy-coated ductile iron water supply pipe, the portion of the electrostatically sprayed epoxy coating extending to the inner wall of the equal-diameter section has a first gradient section with gradually thinning thickness, and the air-sprayed epoxy coating covers the first gradient section to form a portion that transitions to and connects with the electrostatically sprayed epoxy coating; or, the portion of the air-sprayed epoxy coating that connects to the electrostatically sprayed epoxy coating has a second gradient section with gradually thinning thickness, and the electrostatically sprayed epoxy coating covers the second gradient section to form a portion that transitions to and connects with the air-sprayed epoxy coating.

[0007] As described above, in a dual-electrode epoxy-coated ductile iron water supply pipe, the electrostatic sprayed epoxy coating and the air-sprayed epoxy coating have the same thickness, thereby ensuring that the thickness of the dual-electrode epoxy coating is consistent throughout the inner wall of the entire ductile iron water supply pipe body.

[0008] In the above-described dual-electrode epoxy-coated ductile iron water supply pipe, the thickness of the transition joint portion is no more than 1.5 times the thickness of the electrostatic sprayed epoxy coating and the air-sprayed epoxy coating adjacent to both ends.

[0009] In the above-described dual-electrode epoxy-coated ductile iron water supply pipe, the thickness of the transition joint portion is the same as the thickness of the electrostatic sprayed epoxy coating and the air-sprayed epoxy coating.

[0010] In the above-described dual-effect epoxy-coated ductile iron water supply pipe, the length of the portion of the electrostatically sprayed epoxy coating extending to the inner wall of the equal-diameter section is ≤200mm.

[0011] The thickness of the electrostatically sprayed epoxy coating and the air-sprayed epoxy coating in the above-described dual-electrode epoxy-coated ductile iron water supply pipe ranges from 150 to 350 μm.

[0012] The above-described dual-electrode epoxy-coated ductile iron water supply pipe has an electrostatic sprayed epoxy coating and an air-sprayed epoxy coating made of different materials.

[0013] The above-described dual-electrode epoxy-coated ductile iron water supply pipe, wherein the electrostatic spraying epoxy coating is a white ceramic epoxy powder coating, and the air-spraying epoxy coating is a liquid epoxy resin coating.

[0014] The dual-electrode epoxy-coated ductile iron water supply pipe described above also contains other coatings on the inner and / or outer sides of the electrostatic sprayed epoxy coating and the air-sprayed epoxy coating.

[0015] The beneficial effects of this utility model are as follows:

[0016] The dual-purpose epoxy-coated ductile iron water supply pipe provided by this utility model effectively solves problems such as poor spraying quality in the socket section and dead corners in the socket groove spraying by introducing electrostatic spraying epoxy coating in the socket section. At the same time, since the air-sprayed epoxy coating is retained in the equal diameter section, the electrostatic spraying cost of the whole pipe can be reduced by more than 30% while ensuring spraying efficiency. In particular, this utility model ensures that there is no large dimensional gradient at the overlap of the two coatings by extending a part of the electrostatic sprayed epoxy coating to the inner wall of the equal diameter section and transitioning with the air-sprayed epoxy coating in a layered manner. Moreover, since both types of coatings are epoxy coatings, they can achieve good bonding. In addition, the use of white ceramic epoxy powder coating for electrostatic spraying epoxy coating further improves the coating's adhesion, wear resistance and other properties. Attached Figure Description

[0017] The advantages and solutions of this application will become clear to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this invention. In the drawings:

[0018] Figure 1 A schematic diagram of a dual-effect epoxy-coated ductile iron water supply pipe provided for an embodiment of this utility model.

[0019] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0020] The components represented by the various reference numerals in the diagram are:

[0021] Socket section 10, equal diameter section 20, dual-color epoxy coating 30, electrostatic sprayed epoxy coating 31, air sprayed epoxy coating 32, gradient transition interface 33. Detailed Implementation

[0022] Exemplary embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. It should be noted that these embodiments are provided to enable a more thorough understanding of this disclosure and to fully convey the scope of this disclosure to those skilled in the art. This disclosure can be implemented in various forms and should not be limited to the embodiments set forth herein.

[0023] Example 1

[0024] like Figure 1 , Figure 2 As shown in the figure, this embodiment provides a dual-effect epoxy-coated ductile iron water supply pipe, including a ductile iron water supply pipe body and a dual-effect epoxy coating 30 attached to the inner wall of the ductile iron water supply pipe body.

[0025] The ductile iron water supply pipe body described in this embodiment includes a socket section 10 and a constant diameter section 20, from which... Figure 1 As can be seen, the inner and outer diameters of the socket section 10 vary in the axial direction, the inner wall has multiple stepped transition segments and forms a groove structure, while the inner diameter of the equal diameter section 20 is consistent in the axial direction.

[0026] In this embodiment, the dual-purpose epoxy coating 30 includes an electrostatic sprayed epoxy coating 31 attached to the inner wall of the socket section 10 and an air-sprayed epoxy coating 32 attached to the inner wall of the equal diameter section 20. The two epoxy coatings with different properties constitute the dual-purpose epoxy coating 30.

[0027] Among them, the air-sprayed epoxy coating 32 is a coating that has been used in the prior art. It is a coating obtained by air spraying liquid epoxy resin. Other reinforcing components may or may not be added to the coating.

[0028] The electrostatic sprayed epoxy coating 31 is a coating that surpasses the air-sprayed epoxy coating 32 in terms of adhesion and spray density. In this embodiment, a white ceramic epoxy powder coating is selected. Although the white ceramic epoxy powder coating material is a material that already exists in the prior art, in the case of this utility model, it is particularly suitable for electrostatic spraying on the inner wall of the socket section 10 of the ductile iron water supply pipe body. In addition to improving the adhesion and spray density of the coating, it is also superior to ordinary liquid epoxy resin coating in terms of wear resistance, which can improve the spraying quality of the inner wall of the socket section and avoid dead corners in the spraying of the socket groove.

[0029] This embodiment also pays particular attention to improvements in that, such as Figure 1 , Figure 2 As shown, a portion of the electrostatic sprayed epoxy coating 31 extends to the inner wall of the equal diameter section 20 and transitions into the air-sprayed epoxy coating 32 in a layered manner.

[0030] The length of the portion of the electrostatic sprayed epoxy coating 31 extending to the inner wall of the equal diameter section 20 can be selected according to the convenience of the spraying operation, but it should not be too long to avoid increasing unnecessary time and cost. In this embodiment, the recommended size is that the length of the portion of the electrostatic sprayed epoxy coating 31 extending to the inner wall of the equal diameter section 20 is ≤200mm.

[0031] exist Figure 2 As can be seen, in this embodiment, the portion of the electrostatic sprayed epoxy coating 31 extending to the inner wall of the equal diameter section 20 has a first gradient section with a gradually thinning thickness. The air-sprayed epoxy coating 32 covers the first gradient section, thereby forming a portion that transitions and connects with the electrostatic sprayed epoxy coating 31.

[0032] The above structure can be achieved by first electrostatically spraying an epoxy coating 31 onto the inner wall of the socket section 10 of the ductile iron water supply pipe body, and then gradually increasing the feed speed or gradually decreasing the spraying amount as the spraying is about to be completed, thereby forming a first gradient section with gradually thinning thickness. Subsequently, an air-sprayed epoxy coating 32 is sprayed onto the first gradient section using an air-spraying method. Similarly, by controlling the feed speed or the spraying amount, the air-sprayed epoxy coating 32 can cover the electrostatically sprayed epoxy coating 31 in a layered manner, and the thickness should not be too protruding. At least, the thickness of the transition joint should be controlled to be no more than 1.5 times the thickness of the adjacent electrostatically sprayed epoxy coating 31 and the air-sprayed epoxy coating 32 at both ends.

[0033] It is easy to understand that if an air-sprayed epoxy coating 32 is first sprayed onto the inner wall of the equal-diameter section 20 of the ductile iron water supply pipe body, and then an electrostatic sprayed epoxy coating 31 is electrostatically sprayed onto the inner wall of the socket section 10 of the ductile iron water supply pipe body, the resulting structure is as follows: the part where the air-sprayed epoxy coating 32 and the electrostatic sprayed epoxy coating 31 meet has a second transition section with a gradually thinning thickness, and the electrostatic sprayed epoxy coating 31 covers the second transition section to form a part that transitions and meets the air-sprayed epoxy coating 32.

[0034] like Figure 1 , Figure 2 As shown, in this embodiment, the electrostatic sprayed epoxy coating 31 and the air-sprayed epoxy coating 32 have the same thickness, so that the thickness of the amphoteric epoxy coating 30 is consistent throughout the inner wall of the entire ductile iron water supply pipe body. By reasonably controlling the feed speed or spraying amount, the thickness of the transition joint can also be basically the same as the thickness of the electrostatic sprayed epoxy coating 31 and the air-sprayed epoxy coating 32. This thickness range can be selected from 150 to 350 μm in production.

[0035] It should be noted that although the coating on the inner wall of the ductile iron water supply pipe shown in the accompanying drawings of this embodiment is only the amphoteric epoxy coating 30, in actual production, if necessary, other coatings can be included on the inner and / or outer sides of the electrostatic sprayed epoxy coating 31 and the air sprayed epoxy coating 32. Since this is not the focus of this utility model, it will not be exemplified or described in detail.

[0036] In summary, the dual-purpose epoxy-coated ductile iron water supply pipe provided by this utility model effectively solves the problems of poor spraying quality in the socket section 10 and dead corners in the socket groove spraying by introducing an electrostatic sprayed epoxy coating 31 into the socket section 10. At the same time, since the air-sprayed epoxy coating 32 is retained in the equal diameter section 20, the electrostatic spraying cost of the entire pipe can be reduced by more than 30% while ensuring spraying efficiency. By extending a part of the electrostatic sprayed epoxy coating 31 to the inner wall of the equal diameter section 20 and transitioning with the air-sprayed epoxy coating 32 in a layered manner, it is ensured that there is no large dimensional gradient between the two coatings. Moreover, since both coatings are epoxy coatings, they can achieve good bonding. In addition, the use of white ceramic epoxy powder coating for the electrostatic sprayed epoxy coating 31 further improves the coating's adhesion, wear resistance, corrosion resistance, and density. Tests show that its wear resistance is ≥500 revolutions (1kg load) and its adhesion is ≥8MPa, which are superior to ordinary liquid epoxy resin coatings in many aspects.

[0037] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A dual-effect epoxy-coated ductile iron water supply pipe, characterized in that, The system includes a ductile iron water supply pipe body and a dual-purpose epoxy coating (30) attached to the inner wall of the ductile iron water supply pipe body. The ductile iron water supply pipe body includes a socket section (10) and a constant diameter section (20). The inner and outer diameters of the socket section (10) vary in the axial direction, while the inner diameter of the constant diameter section (20) is uniform in the axial direction. The dual-purpose epoxy coating (30) includes an electrostatic sprayed epoxy coating (31) attached to the inner wall of the socket section (10) and an air-sprayed epoxy coating (32) attached to the inner wall of the constant diameter section (20). A portion of the electrostatic sprayed epoxy coating (31) extends to the inner wall of the constant diameter section (20) and transitions to the air-sprayed epoxy coating (32) in a layered manner.

2. The dual-effect epoxy-coated ductile iron water supply pipe according to claim 1, characterized in that, The portion of the electrostatic sprayed epoxy coating (31) extending to the inner wall of the equal diameter section (20) has a first gradient section with gradually thinning thickness, and the air-sprayed epoxy coating (32) covers the first gradient section to form a portion that transitions into contact with the electrostatic sprayed epoxy coating (31); or, the portion of the air-sprayed epoxy coating (32) that connects with the electrostatic sprayed epoxy coating (31) has a second gradient section with gradually thinning thickness, and the electrostatic sprayed epoxy coating (31) covers the second gradient section to form a portion that transitions into contact with the air-sprayed epoxy coating (32).

3. The dual-effect epoxy-coated ductile iron water supply pipe according to claim 2, characterized in that, The electrostatic sprayed epoxy coating (31) and the air-sprayed epoxy coating (32) have the same thickness, so that the thickness of the amphoteric epoxy coating (30) is consistent throughout the inner wall of the ductile iron water supply pipe body.

4. The dual-effect epoxy-coated ductile iron water supply pipe according to claim 3, characterized in that, The thickness of the transition connection portion is no more than 1.5 times the thickness of the electrostatic sprayed epoxy coating (31) and the air sprayed epoxy coating (32) adjacent to it at both ends.

5. A dual-effect epoxy-coated ductile iron water supply pipe according to claim 4, characterized in that, The thickness of the transition joint is the same as the thickness of the electrostatic sprayed epoxy coating (31) and the air sprayed epoxy coating (32).

6. A dual-effect epoxy-coated ductile iron water supply pipe according to any one of claims 1-5, characterized in that, The length of the portion of the electrostatically sprayed epoxy coating (31) extending into the inner wall of the equal diameter section (20) is ≤200mm.

7. A dual-effect epoxy-coated ductile iron water supply pipe according to any one of claims 1-5, characterized in that, The thickness range of the electrostatic sprayed epoxy coating (31) and the air sprayed epoxy coating (32) is 150 to 350 μm.

8. A dual-effect epoxy-coated ductile iron water supply pipe according to any one of claims 1-5, characterized in that, The electrostatic sprayed epoxy coating (31) and the air-sprayed epoxy coating (32) are made of different materials.

9. A dual-effect epoxy-coated ductile iron water supply pipe according to claim 8, characterized in that, The electrostatic sprayed epoxy coating (31) is a white ceramic epoxy powder coating, and the air sprayed epoxy coating (32) is a liquid epoxy resin coating.

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