CN1736618A - Synthetic resin coated foundry iron pipe and its production method - Google Patents
Synthetic resin coated foundry iron pipe and its production method Download PDFInfo
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- CN1736618A CN1736618A CN 200410057743 CN200410057743A CN1736618A CN 1736618 A CN1736618 A CN 1736618A CN 200410057743 CN200410057743 CN 200410057743 CN 200410057743 A CN200410057743 A CN 200410057743A CN 1736618 A CN1736618 A CN 1736618A
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- iron pipe
- cast iron
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Abstract
The invention relates to a method for preparation of a water-feed pig-iron pipe which is coated with synthetic resin and can be antiseptic, and to the pig-iron pipe prepared with the method. Said technique for preparation of pig-iron pipe coated with synthetic resin contains the following steps: heating the pig-iron pipe to the synthetic resin- melting temperature, adding the synthetic resin powder into the inner pig-iron pipe, and rotating the pipe to make the synthetic resin spread with an even thicken as a liquid around the circumferential surface inside the pipe by the centrifugal effort generating by rotating the pipe.
Description
Technical field
The present invention relates to a kind of method of making cast iron pipe, described pipe has filming of synthetic resin on portion's circumferential surface within it, be used for by painting synthetic resin film on the cast iron pipe circumferential surface anticorrosion, described effective feed pipe or the sewage pipe done.
Background technology
Cast iron pipe as feed pipe or sewage pipe pours in the spun casting mould by the foundry goods with fusion, and it is made through centrifugal action.The cast iron pipe of Zhi Zaoing has coarse surface like this, because their coolings and when shrinking produce micropore for example crack and pin hole on its surface.
These perforates and pin hole can cause the propagation of the thing of supporting one's family and produce incrustation scale, thereby cover the circumferential surface of pipe.
For preventing the corrosion in conventional cast iron pipe, the inside and outside circumferential surface of pipe has been coated with coal tar, or forms the compo lining on portion's circumferential surface within it.
Therefore; under crude oil byproduct coal tar or compo are coated on cast iron pipe situation on the cast iron pipe circumferential surface; because stopped up the pin hole that forms on it with coal tar or compo, this cast iron pipe demonstrates non-oxidizability, thereby protects its circumferential surface.But when the cast iron pipe that is coated with coal tar or handles with the compo lining during as feed pipe, recent findings coal tar or compo can little by little be dissolved in the running water, and become a kind of harmful noxious material.The invention provides the method that a kind of manufacturing is used for the cast iron pipe of feed pipe or sewage pipe, it comprises the steps, centrifugal casting process by routine synthetic resin powder is injected and melt coating on the circumferential surface of molded cast iron pipe, the rotation cast iron pipe is to form ganoid the filming of thickness homogeneous on the circumferential surface of cast iron pipe, therefore can prevent because the corrosion that the oxidation of cast iron pipe causes, therefore can wholesomely carry running water, and a kind of cast iron pipe of the painting synthetic resin of being made by this method is provided.
Summary of the invention
Therefore, because above-mentioned problem has been carried out the present invention, an object of the present invention is to provide the method that a kind of manufacturing is suitable for supplying the cast iron pipe of sanitation and hygiene running water, described pipe prepares by form synthetic resin coating film on the cast iron pipe circumferential surface, with the corrosion that prevents to cause, and the invention provides a kind of cast iron pipe of the painting synthetic resin of making by this method owing to its oxidation.
Ground water supply pipe or sewage pipe should have enough fastnesses and be easy to break and damage under ground pressure or other load to prevent it, nor should be oxidized easily and be corroded.
The fastness of feed pipe and its thickness are in direct ratio, but for preventing because the corrosion that causes of oxidation, non-oxide material should be applied among the internal diameter of pipe or on.
Be applied on the inside and outside circumferential surface of cast iron pipe method for anticorrosion treatment with the routine that prevents its oxidation, comprise that the byproduct coal tar with crude oil is coated with its circumferential surface, or insert the cement lining of mainly forming, or film by coating cement slurry formation on cast iron pipe inside or outer circumferential surface by cement.But cement or coal tar produce harmful material, therefore are not suitable for use in supplying the anticorrosion coating material of the feed pipe of the daily running water of people.
Therefore, from considering the viewpoint of above-mentioned those problems, the invention provides a kind of cast iron pipe that contains harmless synthetic resin material, described synthetic resin comprises polyethylene resin powder or the fluorine-containing synthetic resin of melt coating on the cast iron pipe circumferential surface, it is obtained by following method, by cast iron pipe being heated to the fusing point of synthetic resin material, synthetic resin powder is injected in the cast iron pipe internal diameter to form synthetic resin coating film thereon, and it is the thickness and the surface smoothing of homogeneous that the rotation pipe makes synthetic resin coating film coating on the tube interior circumferential surface of heating with the centrifugal force that produces by the pipe rotation.
The accompanying drawing summary
By following detailed description also in conjunction with the accompanying drawings, can more be expressly understood above-mentioned and other purposes and other advantage of the present invention.Wherein:
Fig. 1 is the process flow diagram of preparation synthetic resin coating of the present invention cast iron pipe;
Fig. 2 is the generalized section of heating cast iron pipe heating furnace;
Fig. 3 is to use the synthetic resin injection device to form the schematic diagram of coating process by the injecting synthetic resin powder on the cast iron pipe internal diameter;
Fig. 4 is the profile of cast iron pipe;
Fig. 5 is the profile that forms the cast iron pipe of filming on it;
Fig. 6 forms the profile of filming and forming the cast iron pipe of corrosion prevention film in its outside on the cast iron pipe circumferential surface.
The description of preferred implementation
Describe preferred implementation of the present invention in detail with reference to following accompanying drawing.
According to the present invention, a kind of method for preparing painting synthetic resin cast iron pipe 21 is provided, described pipe portion and outer circumferential surface within it has and films 22 and corrosion prevention film 23, and this method comprises the steps:
Use abrasive blast equipment 11 that sand grains and the compressed air that grinds is blown in the internal diameter of cast iron pipe 21, to remove the foreign matter that exists on cast iron pipe 21 circumferential surface;
The injection-tube of synthetic resin powder injection device 13 is inserted into the inside of the cast iron pipe 21 of heating, then with compressed air injecting synthetic resin powder;
Use rotating carrier 14 rotations and carry cast iron pipe 21 so that melt coating has the thickness of homogeneous and smooth circumferential surface at the synthetic resin coating film 22 of cast iron pipe 21 circumferential surface; And
Below be described in greater detail in the method that forms synthetic resin coating film 22 on cast iron pipe 21 circumferential surface.
The cast iron pipe 21 of aforementioned preparation contacts oxidized easily with air, therefore produce iron rust, therefore will remove the foreign matter of circumferential surface before all technologies.
But cast iron pipe 21 length are generally 5,000～7, and 000mm, diameter are 50～2, and therefore 500mm is not easy to remove the foreign matter attached on its circumferential surface.
Therefore, the present invention uses abrasive blast equipment 11, and it utilizes compressed air the sand grains that grinds at full speed to be injected into the circumferential surface of cast iron pipe to remove dust, iron rust and any other impurity from the tube interior circumferential surface.Afterwards, compressed air is blown into pipe to clean its inner surface.
Use compressed air and abrasive grit to utilize the cast iron pipe of abrasive blast equipment 11 its circumferential surface of cleaning, be placed in then in the heating furnace 12, be heated to 300～350 ℃ temperature.
300～350 ℃ heating-up temperature is to want painting synthetic resin moment melt temperature, can be increased or reduces according to required coating layer thickness is optional.
Next, the ascending pipe 13-1 of synthetic resin powder injection device 13 is inserted in the internal diameter of cast iron pipe 21 of heating, amount corresponding to desired thickness synthetic resin is injected into by air pressure, simultaneously the internal diameter along pipe moves forward and backward synthetic resin ascending pipe 13-1, and the synthetic resin powder of injection is bonded and be melted in to form on cast iron pipe 21 circumferential surface of heating and film 22.
For the synthetic resin powder that is injected into by ascending pipe 13-1, in the film forming synthetic resin material of hot melt, thereby the material of preferred use has uncorroded acid-fast alkali-proof material, cast iron pipe is had the material that good tack is coated with the incrust material in back, abrasion-proof corrosion-proof corrosion material and impacts difficult fragmentation in back or distortion.Although thickness can change according to the size of cast iron pipe 21, the thickness of the synthetic resin coating film 22 that forms is 0.3～100mm.
Further, the preferred synthetic resin of the energy that has microbe killing properties that uses is bred on the cast iron pipe surface to prevent microorganism.
About this point, as the synthetic resin material that satisfies above-mentioned condition, the present invention uses polyethylene resin powder, or fluorine-containing synthetic resin powder is as coating agent.
Therefore, polyethylene resin powder or fluorine-containing synthetic resin powder are coated with to form on the circumferential surface of cast iron pipe with the thickness of 0.2～100mm and film according to the present invention, rotate cast iron pipe 21 so that film 22, thereby have smooth surface, inside with homogeneous thickness painting synthetic resin on the cast iron pipe circumferential surface.
Promptly, synthetic resin carries out fusion and is adhered on the circumferential surface of pipe filming 22 with formation by the cast iron pipe of heating, when cast iron pipe 21 was rotated carrier 14 rotations and carries, described film launched to have with formation the circumferential surface of homogeneous thickness and smoothness equably.
About this point, at room temperature cool off the cast iron pipe 21 that forms synthetic resin coating film 22 on portion's circumferential surface within it by its rotation.After cooling was finished, corrosion prevention film 23 was coated on the tube exterior circumferential surface.
Use conventional coating to implement corrosion prevention film 23 is coated on technology on the cast iron pipe outer circumferential surface by sprayer or brush.Afterwards, the two ends of pipe are blocked to prevent that foreign matter from entering, and store stand-by.
Simultaneously, prepare the method for cast iron pipe, 1000～1800 ℃ of melt metal are poured in the mould that is equipped with spun casting equipment, rotate this mould simultaneously with this cast iron pipe of casting according to routine.Then, with this iron pipe water spray quenching that does not also have the high temperature casting of cooling.
As a result, the cast iron pipe of quenching does not have toughness and ductility, the therefore influence that is easy to be hit, in addition also destroyed easily under very weak impact.
But, in cast iron pipe made according to the method for the present invention, the annealing process of carrying out by this way, being heated the scheduled time at pipe reaches during 300-350 ℃, synthetic resin is melted under this temperature, the structure of cast iron pipe is recrystallized densely, therefore gives pipe toughness and ductility, thereby makes cast iron pipe have erosion-resisting characteristics and high internal density.
Therefore, when synthetic resin powder was injected on the cast iron pipe circumferential surface of heating, annealing process was carried out automatically, and in slow cooling, the rotation pipe has filming of certain smoothness and homogeneous thickness with formation.Simultaneously, the structural change that makes cast iron pipe is fine and close attitude, therefore gives pipe toughness and ductility.
As mentioned above,, on the inside and outside circumferential surface of cast iron pipe, be coated with the byproduct coal tar of crude oil, or the cement film (cement lining) that forms predetermined thickness is gone up in the footpath within it for preventing the iron rust in conventional cast iron pipe.
Such coal tar or cement film are dissolved in the water or in water gradually degrades, and therefore produces the material poisonous to human body.
And the oxidized formation thick film of the circumferential surface of conventional cast iron pipe causes that the accumulation of foreign matter diminishes the internal diameter of pipe, so the flow velocity of pipe reduces.In addition, be attached to the space that foreign matter on the cast iron pipe circumferential surface and oxide-film provide microbial growth, therefore the water that provides continuously is uncleanly.
Particularly, the recent incrustation scale that forms at pipe and running water contact-making surface place that studies show that has produced the biomembrane that microorganism can grow, thus detrimental microorganisms for example virus, bacterium, large intestine (bar) bacterium etc. can breed.
But cast iron pipe of the present invention has the synthetic resin coating film of predetermined thickness within it on portion's circumferential surface, therefore can prevent described oxidation and gets rusty.And filming of forming like this has constant thickness and very smooth surface, therefore can promote the flow velocity of pipe.
In addition, when cast iron pipe places heating furnace and is heated the scheduled time with on portion's circumferential surface within it during molten synthetic resin, it is fine and close that the structure of pipe becomes, and the annealing process of giving pipe toughness and ductility, thereby the cast iron pipe of high-impact can be provided.
Particularly, on the inner inwall of predetermined thickness synthetic resin coating film that forms of cast iron pipe, formed other inner tube at cast iron pipe, therefore has the effect that reduces water risk of leakage from pipe, even because when cast iron pipe during by damage, coating wherein also is not easy to be damaged.
Therefore, in cast iron pipe of the present invention, synthetic resin coating film has the thickness of homogeneous, has formed smooth circumferential surface, thereby can prevent the oxidation of pipe and, therefore can provide the running water of cleaning because foreign matter is attached to the pollution that causes on its circumferential surface.
Although from illustrative purposes, preferred implementation of the present invention is at length disclosed, but it is possible that those of ordinary skill in the art should understand various variation of the present invention, increase and replacement, and does not deviate from as the disclosed scope and spirit of the present invention of claims.
Claims (4)
1. a method for preparing the painting synthetic resin cast iron pipe comprises the steps:
Use abrasive blast equipment that sand grains and the compressed air that grinds is blown in the internal diameter of cast iron pipe (21), to remove the foreign matter that exists on the cast iron pipe circumferential surface;
Cast iron pipe (21) placed heating furnace (12) and be heated to the temperature of 300～350C;
The injection-tube (13-1) of synthetic resin powder is inserted into the inside of the cast iron pipe (21) of heating, then with compressed air injecting synthetic resin powder;
Rotate cast iron pipe (21) so that the synthetic resin coating film (22) of melt coating on cast iron pipe (21) circumferential surface has the thickness of homogeneous, and have smooth circumferential surface; And
On the outer circumferential surface of the cast iron pipe of cool to room temperature (21), be coated with corrosion prevention film (23).
2. method as claimed in claim 1, the synthetic resin powder that wherein is used to be coated with is a polyethylene resin powder.
3. method as claimed in claim 1, the synthetic resin powder that wherein is used to be coated with are fluorine-containing synthetic resin powders.
4. the cast iron pipe of a painting synthetic resin, it is by each method preparation of claim 1～3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410057743 CN1736618A (en) | 2004-08-16 | 2004-08-16 | Synthetic resin coated foundry iron pipe and its production method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410057743 CN1736618A (en) | 2004-08-16 | 2004-08-16 | Synthetic resin coated foundry iron pipe and its production method |
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| Publication Number | Publication Date |
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| CN1736618A true CN1736618A (en) | 2006-02-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200410057743 Pending CN1736618A (en) | 2004-08-16 | 2004-08-16 | Synthetic resin coated foundry iron pipe and its production method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102825697A (en) * | 2012-08-30 | 2012-12-19 | 江苏双达工程技术研究中心有限公司 | Processing technology of polyethylene grey pipeline |
| CN104976439A (en) * | 2015-05-25 | 2015-10-14 | 柳州市百田机械有限公司 | Production method for anticorrosive nodular cast iron pipe |
| CN110494227A (en) * | 2017-03-31 | 2019-11-22 | 因普罗考特控股有限公司 | For coating the method and coating equipment of pipe |
| CN115233215A (en) * | 2022-07-25 | 2022-10-25 | 江苏大学 | Transient heating cladding device and method for large depth-diameter ratio curved hole |
-
2004
- 2004-08-16 CN CN 200410057743 patent/CN1736618A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102825697A (en) * | 2012-08-30 | 2012-12-19 | 江苏双达工程技术研究中心有限公司 | Processing technology of polyethylene grey pipeline |
| CN104976439A (en) * | 2015-05-25 | 2015-10-14 | 柳州市百田机械有限公司 | Production method for anticorrosive nodular cast iron pipe |
| CN110494227A (en) * | 2017-03-31 | 2019-11-22 | 因普罗考特控股有限公司 | For coating the method and coating equipment of pipe |
| CN110494227B (en) * | 2017-03-31 | 2022-03-18 | 因普罗考特控股有限公司 | Method for coating a pipe and coating device |
| CN115233215A (en) * | 2022-07-25 | 2022-10-25 | 江苏大学 | Transient heating cladding device and method for large depth-diameter ratio curved hole |
| CN115233215B (en) * | 2022-07-25 | 2024-02-13 | 江苏大学 | Transient heating cladding device and method for large-depth-diameter-ratio curved hole |
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