Anti-corrosion plastic-lined steel pipe

Abstract

The utility model discloses an anti-corrosion plastic-lined steel pipe which comprises a steel pipe body, a plastic layer is arranged on the inner wall of the steel pipe body, a protective film is wrapped on the steel pipe body, the protective film is made of polypropylene, a plurality of clamping pieces are arranged outside the protective film, each clamping piece comprises a first clamping ring and a second clamping ring, and nuts are tightly arranged on a first clamping column and a second clamping column in a sleeved mode. The steel pipe is wrapped with the protective film, the plastic-lined steel pipe is protected through the protective film, polypropylene is good in thermal stability, good in corrosion resistance and chemical stability, capable of resisting erosion of most chemical substances, not prone to being affected by oxidation, acid-base and other chemical reactions and long in service life, and the protective film can be fixed to the steel pipe through the clamping piece; and meanwhile, disassembly and assembly are convenient, and the protective film is replaced in time.

Description

Technical Field

[0001] This utility model belongs to the technical field of plastic-lined steel pipes, and in particular relates to a corrosion-resistant plastic-lined steel pipe. Background Technology

[0002] Plastic-lined steel pipes use galvanized seamless steel pipes or welded steel pipes as the base pipe. After removing the weld beads from the inner wall, a food-grade polyethylene pipe of the same diameter as the galvanized pipe is inserted. Finally, it is formed by pressurizing and heating for a certain period of time. It is an upgraded product of traditional galvanized pipes. To prevent corrosion during long-term use, a protective coating is usually applied to the outer wall of the plastic-lined steel pipe. However, with wind, sun, and rain, the protective coating will be washed away and can no longer protect the plastic-lined steel pipe. The subsequent spraying operation is also relatively cumbersome, time-consuming, and labor-intensive. Utility Model Content

[0003] To address the above problems, this utility model provides a corrosion-resistant plastic-lined steel pipe.

[0004] This utility model is implemented as follows: A corrosion-resistant plastic-lined steel pipe includes a steel pipe with flanges symmetrically fixed on the outer walls at both ends. A protective coating is applied to the outer wall of the steel pipe to protect the plastic-lined steel pipe. A plastic layer is fixed on the inner wall of the steel pipe. A protective film is wrapped around the steel pipe to protect the plastic-lined steel pipe. The protective film is made of polypropylene, which has high hardness, strength, and rigidity, good thermal stability, good corrosion resistance and chemical stability, and can withstand the erosion of most chemical substances. It is not easily affected by oxidation, acid and alkali reactions, etc., and has a long service life. Multiple clamps are provided on the outside of the protective film to fix it to the steel pipe. The clamps include a semi-circular first clamping ring and a second clamping ring. One end of the first clamping ring is hinged to one end of the second clamping ring, ensuring a reliable connection and easy rotation. The other end of the first clamping ring is fixedly provided with a first locking post, and the other end of the second clamping ring is fixedly provided with a second locking post. The first and second locking posts are semi-cylindrical structures, with the end faces of the first and second locking posts abutting against each other. The outer wall of the first locking post is provided with a first external thread, and the outer wall of the second locking post is provided with a second external thread. The threads of the first and second external threads are matched. Nuts are tightly fitted on the first and second locking posts. When the first and second clamping rings are closed and the first and second locking posts are tightly abutting against each other, the protective film is clamped onto the steel pipe. At this time, the nuts are fitted onto the first and second locking posts to ensure a reliable connection between the first and second locking posts.

[0005] Preferably, a first groove is provided at the lower end of the first clamping ring located at the first clamping post, and a second groove is provided at the lower end of the second clamping ring located at the second clamping post, which limits the position of the pressure rod. The first groove and the second groove are corresponding in position and the same size. A pressure rod is tightly installed through the first groove and the second groove. The lower end of the pressure rod is tightly pressed against the protective film, wrapping the protective film around the steel pipe. The pressure rod squeezes the joint of the protective film to prevent the protective film from being torn. The clamping device limits the position of the pressure rod to ensure the stability and reliability of the pressure rod position.

[0006] Preferably, multiple annular grooves are evenly formed on the outer wall of the steel pipe, and the clamp is disposed in the annular grooves to prevent the clamp from moving.

[0007] Preferably, the annular groove is an isosceles trapezoidal structure with a wider outer edge and a narrower inner edge, ensuring a smooth connection with the protective film and avoiding damage to the protective film.

[0008] The beneficial effects of this utility model are: wrapping a protective film on the steel pipe protects the plastic-lined steel pipe. Polypropylene has good thermal stability, good corrosion resistance and chemical stability, can withstand the erosion of most chemical substances, is not easily affected by oxidation, acid and alkali and other chemical reactions, and has a long service life. The protective film can be fixed on the steel pipe by the clamp, and it is also easy to disassemble and replace the protective film in a timely manner. Attached Figure Description

[0009] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0010] Figure 2 A schematic diagram of the connection structure between the clamp and the plastic-lined steel pipe;

[0011] Figure 3 This is an enlarged view of the connection between the pressure bar and the protective film;

[0012] Figure 4 A schematic diagram of the connection structure between the first locking pin, the second locking pin, and the nut;

[0013] In the diagram: 1. Steel pipe; 2. Flange; 3. Plastic layer; 4. Protective film; 5. Clamp; 6. First clamping ring; 7. Second clamping ring; 8. First locking post; 9. Second locking post; 10. Nut; 11. First locking groove; 12. Second locking groove; 13. Pressure bar; 14. Ring groove. Detailed Implementation

[0014] To better understand the technical solution of this utility model, the following description, in conjunction with the accompanying drawings, further illustrates this utility model.

[0015] like Figure 1-4The diagram illustrates a corrosion-resistant plastic-lined steel pipe, comprising a steel pipe 1. Flanges 2 are symmetrically fixed to the outer walls of both ends of the steel pipe 1. A protective coating is applied to the outer wall of the steel pipe 1 to protect the plastic-lined steel pipe. A plastic layer 3 is fixed to the inner wall of the steel pipe 1. A protective film 4 is wrapped around the steel pipe 1 to protect the plastic-lined steel pipe. The protective film 4 is made of polypropylene, which has high hardness, strength, and rigidity, good thermal stability, good corrosion resistance, and chemical stability. It can withstand the erosion of most chemical substances and is not easily affected by oxidation, acid and alkali reactions, etc., resulting in a long service life. Multiple clamps 5 are provided on the outside of the protective film 4 to fix it to the steel pipe 1. Each clamp 5 includes a semi-circular first clamping ring 6 and a second clamping ring 7. One end of the first clamping ring 6 is connected to the second clamping ring 7. One end of each clamping ring is hinged together, ensuring reliable connection and easy rotation. The other end of the first clamping ring 6 is fixedly provided with a first locking post 8, and the other end of the second clamping ring 7 is fixedly provided with a second locking post 9. The first locking post 8 and the second locking post 9 are semi-cylindrical structures. The end face of the first locking post 8 abuts against the end face of the second locking post 9. The outer wall of the first locking post 8 is provided with a first external thread, and the outer wall of the second locking post 9 is provided with a second external thread. The threads of the first external thread and the second external thread are matched. Nuts 10 are tightly fitted on the first locking post 8 and the second locking post 9. When the first clamping ring 6 and the second clamping ring 7 are closed, and the first locking post 8 and the second locking post 9 are tightly abutted together, the protective film 5 is clamped onto the steel pipe 1. At this time, the nut 10 is fitted onto the first locking post 8 and the second locking post 9 to ensure a reliable connection between the first locking post 8 and the second locking post 9.

[0016] A first groove 11 is provided at the lower end of the first clamping ring 6 located at the first clamping post 8, and a second groove 12 is provided at the lower end of the second clamping ring 7 located at the second clamping post 9, which limits the position of the pressure rod 13. The first groove 11 and the second groove 12 are corresponding in position and the same size. The pressure rod 13 is tightly installed through the first groove 11 and the second groove 12. The lower end of the pressure rod 13 is tightly pressed against the protective film 4, wrapping the protective film 4 around the steel pipe 1. The pressure rod 13 squeezes the joint of the protective film 4 to prevent the protective film 4 from being torn. The clamp 5 limits the position of the pressure rod 13 to ensure the stability and reliability of the position of the pressure rod 13.

[0017] Multiple annular grooves 14 are evenly formed on the outer wall of the steel pipe 1. The clamp 5 is disposed in the annular groove 14 to prevent the clamp 5 from moving. The annular groove 14 has an isosceles trapezoidal structure that is wider at the outside and narrower at the inside, ensuring a smooth connection with the protective film 4 and preventing damage to the protective film 4.

[0018] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A plastic-lined steel pipe with anticorrosion, comprising a steel pipe, flanges symmetrically fixed on the outer wall of the steel pipe at both ends, a protective coating coated on the outer wall of the steel pipe, and a plastic layer fixed on the inner wall of the steel pipe, characterized in that, The steel pipe is wrapped with a protective film, the material of the protective film is polypropylene, the outer part of the protective film is provided with a plurality of clamps, the clamp comprises a semicircular first clamp ring and a second clamp ring, one end of the first clamp ring and one end of the second clamp ring are hinged together, the other end of the first clamp ring is fixedly provided with a first clamping column, the other end of the second clamp ring is fixedly provided with a second clamping column, the first clamping column and the second clamping column are semicircular column structures, the end face of the first clamping column and the end face of the second clamping column abut together, the outer wall of the first clamping column is provided with a first external thread, the outer wall of the second clamping column is provided with a second external thread, the threads of the first external thread and the second external thread are matched, and a nut is tightly sleeved on the first clamping column and the second clamping column.

2. The anticorrosive plastic-lined steel pipe according to claim 1, wherein A first clamping groove is formed in the lower end of the first clamp ring at the first clamping column, and a second clamping groove is formed in the lower end of the second clamp ring at the second clamping column, the positions of the first clamping groove and the second clamping groove correspond and the sizes of the first clamping groove and the second clamping groove are the same, a pressing rod is tightly arranged through the first clamping groove and the second clamping groove, and the lower end of the pressing rod tightly abuts against the protective film.

3. The anticorrosive plastic-lined steel pipe according to claim 1, wherein A plurality of ring grooves are uniformly formed on the outer wall of the steel pipe, and the clamp is arranged in the ring groove.

4. The anticorrosive plastic-lined steel pipe according to claim 3, wherein The ring groove is an isosceles trapezoidal structure with an outer width and an inner width.

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