CN1044981C - Technique for coating inside wall of metal pipe with plastic powder - Google Patents
Technique for coating inside wall of metal pipe with plastic powder Download PDFInfo
- Publication number
- CN1044981C CN1044981C CN 92112180 CN92112180A CN1044981C CN 1044981 C CN1044981 C CN 1044981C CN 92112180 CN92112180 CN 92112180 CN 92112180 A CN92112180 A CN 92112180A CN 1044981 C CN1044981 C CN 1044981C
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- metal tube
- port
- pipe fitting
- electrode
- technique
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- Electrostatic Spraying Apparatus (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The present invention relates to a technique for coating plastic powder on the inner walls of metal pipe fittings. The technique is composed of a spraying working procedure and a baking working procedure, wherein in the spraying working procedure, a negative high-voltage electrode is placed in the axle center of a metal pipe fitting, plastic powder is sprayed in from one end opening of the pipe fitting, and air is pumped from the other end opening of the pipe fitting, so that the plastic powder can be sprayed on the inner wall of the pipe fitting; in the baking working procedure, a metal pipe coated with plastics on the inner wall can be formed after melting, leveling and solidifying. The technique of the present invention has the advantages of simple operation and low cost; produced plastic coating metal pipes have a good anticorrosive property.
Description
The present invention relates to the plastic powders coating process, especially a kind of technique for coating inside wall of metal pipe with plastic powder.It is suitable for the small-bore pipe inwall, in industries such as chemical industry, oil, printing and dyeing metal tube is carried out preservative treatment.
What conventional plastic powders coating process adopted is spraying and roasting procedure, and wherein, spraying process is to adopt spray gun that plastic powders is sprayed to surface of the work in vaporific mode, then, roasting procedure is heated to the plastic powders that is sprayed on surface of the work, makes its fusing, levelling and curing.Surface of the work application outside this technology is applicable to and is exposed to, and obviously inapplicable for the application on the inner surface of narrow work (as the small-bore pipe inwall).At chemical industry, industries such as oil and printing and dyeing have very high requirement to the antiseptic property of metal tube inwall.At present, the measure of employing roughly has dipping lacquer and steel-plastics composite pipe in the pipe, and the former corrosion-resistant effect is not very desirable; Latter's cost is too high.Till now, it is low a kind of cost also not occur, the metal tube inner wall anti-corrosive process of favorable anti-corrosion effect.
The objective of the invention is the problem at above-mentioned prior art existence, the spraying process in the plastic powders coating process of routine is improved, it is low to propose a kind of cost, the technique for coating inside wall of metal pipe with plastic powder of favorable anti-corrosion effect.
The present invention includes spraying process and baking or quenching curing process.Wherein, the technical scheme that spraying process adopts is to place an electrode 4 at the shaft core position of metal tube 1, and this electrode 4 links with the negative pole of DC high-voltage power supply 9, and the positive pole of DC high-voltage power supply 9 and metal tube 1 link, metal tube 1 ground connection.During spraying,, bleed from another port of pipe fitting 1 from a vaporific plastic powders of port spirt of pipe fitting 1.When high voltage source is connected, electrode 4 band negative high voltages, space between electrode 4 and the tube wall produces highfield, make the air generation corona in the electric field, produce a large amount of free electrons, the vaporific plastic powders particulate adhesion free electron that enters in the pipe fitting 1 makes it electronegative, and under the effect of electric field force, electronegative plastic powders is adsorbed on the inwall of pipe fitting 1.So just plastispray to the inwall of pipe fitting 1.After spraying process is over, sends pipe fitting 1 to drying tunnel again and heat, enter roasting procedure, the plastic powders that adheres to pipe fitting 1 inwall through fusing, levelling, curing after, pipe fitting 1 is taken out, promptly become the metal tube of inwall plastic-blasting.If the thermoplastic powder after roasting procedure is through fusing, levelling, carries out hardening with its taking-up and make its curing.
The present invention is simple to operate, and is with low cost, and plastic-blasting thickness is even, its favorable anti-corrosion effect of plastic-blasting pipe of making.
Specifically describe embodiments of the invention below in conjunction with accompanying drawing.
Fig. 1 is the spraying principle schematic of the embodiment of the invention 1.
Fig. 2 is the front view of insulating support 5 among Fig. 1.
Fig. 3 is the left view of Fig. 2.
Fig. 4 is the spraying principle schematic of the embodiment of the invention 2.
In the spraying process of embodiment 1, electrode 4 is noncontinuous electrodes, the heart yearn of it and shielded cable 6 links, the insulating support 5 that is positioned at pipe fitting 1 is bearing in the shaft core position of pipe fitting 1, the heart yearn of shielded cable 6 connects DC high-voltage power supply 9 negative poles by resistance 10, the outer conductor of shielded cable 6 and pipe fitting 1 connect the anodal and ground connection of DC high-voltage power supply 9, gap 11 is used to prevent that supply voltage is too high and cause electrode 4 sparkings causing plastic powders burning in the pipe fitting 1, the distance of gap 11 is adjustable, internal diameter according to pipe fitting 1 is transferred to correct position, is with an insulating sleeve 8 on the port 3 of pipe fitting 1.During spraying, podwer gun 7 sprays into vaporific plastic powders in the pipe from port 2, air exhauster is outwards bled from the port 3 of pipe fitting 1, simultaneously, electrode 4 is moved to port 3 from the port 2 of pipe fitting 1 at leisure, and in the place of electrode 4 processes, the inwall of pipe fitting 1 all is filled plastic powders, when electrode 4 withdrawed from the end, insulating sleeve 8 can prevent electrode 4 and metal tube 1 collision sparking.
In the spraying process of embodiment 2, be with an insulating sleeve 5 and 6 on the port 2 of pipe fitting 1 and the port 3 fully, electrode 4 is long electrodes, and what it adopted is an iron wire 5, and two of iron wire 5 is fixed on insulating sleeve 5 and 6, and is positioned at the shaft core position of pipe fitting 1.During spraying, spray gun 7 sprays into vaporific plastic powders in port 2, and air exhauster is outwards bled from port 3, when plastic powders is flowed through in the pipe fitting 1, with electronegative, and is adsorbed onto equably on the inwall of pipe fitting 1.After spraying process is intact, put pipe fitting 1 into the drying tunnel baking together with two insulating sleeves 5 and 6 with iron wire 5, powder, takes off insulating sleeve 5 and 6 after the curing through fusing, levelling again, iron wire is taken out get final product.
Claims (3)
1. technique for coating inside wall of metal pipe with plastic powder, comprise spraying and baking or hardening curing process, it is characterized in that: spraying process is to place an electrode 4 at the shaft core position of metal tube 1, this electrode 4 links with the negative pole of DC high-voltage power supply 9, the positive pole of DC high-voltage power supply 9 and metal tube 1 link, and metal tube 1 ground connection is during spraying, from the vaporific plastic powders of a port spirt of pipe fitting 1, bleed from the another port of pipe fitting 1.
2. according to the spraying process in the described technique for coating inside wall of metal pipe with plastic powder of claim 1, it is characterized in that: the electrode 4 that it adopts is noncontinuous electrodes, can move axially at the shaft core position of metal tube 1, during spraying, spray into vaporific plastic powders from the port 2 of metal tube 1, outwards bleed from the port 3 of metal tube 1, simultaneously electrode 4 is moved to the port 3 of metal tube 1 from the port 2 of metal tube 1 at leisure.
3. according to the spraying process in the described technique for coating inside wall of metal pipe with plastic powder of claim 1, it is characterized in that: the electrode 4 that it adopts is long electrodes that are fixed on metal tube 1 shaft core position, during spraying, spray into vaporific plastic powders from a port of metal tube 1, outwards bleed from another port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92112180 CN1044981C (en) | 1992-10-14 | 1992-10-14 | Technique for coating inside wall of metal pipe with plastic powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92112180 CN1044981C (en) | 1992-10-14 | 1992-10-14 | Technique for coating inside wall of metal pipe with plastic powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1085134A CN1085134A (en) | 1994-04-13 |
| CN1044981C true CN1044981C (en) | 1999-09-08 |
Family
ID=4945795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92112180 Expired - Fee Related CN1044981C (en) | 1992-10-14 | 1992-10-14 | Technique for coating inside wall of metal pipe with plastic powder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1044981C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1302858C (en) * | 2004-01-18 | 2007-03-07 | 新兴铸管股份有限公司 | Process for coating polyurethane on inner and outer surface of nodular graphite cast iron pipe |
| CN1297353C (en) * | 2004-01-18 | 2007-01-31 | 新兴铸管股份有限公司 | Plastic-blasting process for cast iron pipe inner surface |
| CN1297352C (en) * | 2004-01-18 | 2007-01-31 | 新兴铸管股份有限公司 | Heating die centrifugal casting mold spraying process for grey cast iron pipe with flexible interface |
| CN107866355B (en) * | 2017-11-02 | 2023-08-08 | 上海船舶工艺研究所 | Spraying and plastic coating device and process for plastic coated ship pipe |
| CN114029203B (en) * | 2021-11-19 | 2023-05-26 | 潍坊联威机械有限公司 | Pipe fitting inner coating negative pressure production equipment |
-
1992
- 1992-10-14 CN CN 92112180 patent/CN1044981C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1085134A (en) | 1994-04-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| OR01 | Other related matters | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |