CN112657814A - Novel water pipe inner lining plastic process - Google Patents
Novel water pipe inner lining plastic process Download PDFInfo
- Publication number
- CN112657814A CN112657814A CN202011379204.2A CN202011379204A CN112657814A CN 112657814 A CN112657814 A CN 112657814A CN 202011379204 A CN202011379204 A CN 202011379204A CN 112657814 A CN112657814 A CN 112657814A
- Authority
- CN
- China
- Prior art keywords
- pipe
- pipe fitting
- preheating
- temperature
- coating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a novel water pipe inner lining plastic process, which comprises the following steps: (1) performing shot blasting on the pipe fitting to remove rust and ensure the cleanness of the inner wall of the pipe fitting; (2) putting the clean pipe fittings on a hanger and sending the pipe fittings into a preheating furnace for preheating; (3) after preheating, the pipe enters a temperature detection system for temperature detection; (4) the qualified pipe fittings are detected to enter a spraying room, and electrostatic spraying is carried out on the inner walls of the pipe fittings; (5) the sprayed pipe fitting enters a thickness detection system to detect the thickness of the coating; (6) and (5) the workpiece which is detected to be qualified enters an oven to be cured. The invention has the beneficial effects that: the coating has firm physical properties, good adhesiveness with the pipe fitting and certain ductility, and after cold and hot water is conveyed in the using process of the pipe fitting, the expansion and cold contraction coefficients of the coating are not different from those of the pipe fitting, so that the integrity of the coating is ensured, and the pipeline and a water valve cannot be blocked.
Description
Technical Field
The invention belongs to the technical field of lining plastic, and particularly relates to a novel water pipe lining plastic process.
Background
The traditional method of moulding is moulded to inside lining of pipe fitting inner wall is a hot lining technology of moulding, as the name suggests, just preheat the pipe fitting to 300 ℃ of temperature, after taking out the pipe fitting, inside filling the pipe fitting with the PE granule is manual, get up the end and the mouth shutoff of pipe fitting with dedicated instrument, operating personnel wears to prevent the continuous even pipe fitting that shakes of scalding gloves, treat that the PE granule is not enough to melt the PE granule because of the pipe fitting temperature drops after, pour the PE granule that will not melt, place the pipe fitting again on the support and treat that the pipe fitting temperature drops, inside PE granule also forms basically and coats after filming, carry out next step's process again, the operation and the coating of whole process have following shortcoming: (1) the operation process is carried out at extremely high temperature, which causes high temperature condition to the surrounding environment of the operation site and easily causes scald to the operators; (2) because the sizes and thicknesses of the pipes are different, the temperature of the preheated pipes is very nonstandard, and the PE particles are added later, the stability of the coating is difficult to ensure due to the diversity and the uncontrollable property of the temperature, and the PE particles sold in the market need to form a stable coating, the required external temperature is about 300 ℃, the time is more than 5min, and the formed coating is a product after incomplete curing under the uncontrollable influence of the outside and the pipes, so that hidden troubles are buried in engineering application in the future; (3) because the PE particles belong to primary unprocessed plastic granules, a large amount of dense smoke is released due to temperature in the operation process, and a great deal of harm is brought to environmental protection; (4) due to temperature and traditional processes and defects, after the final pipe fitting is subjected to hot lining plastic, the cold expansion coefficients of the plastic coating and iron are different due to cold water after the coating is led into the pipeline, the incompletely cured coating is easy to form integral delamination with the iron surface of the pipe fitting under the driving and pressure of water, and the coating can be dissociated in the pipeline and block the calibers of a water valve and a spraying facility under certain conditions, so that the water is not smoothly led into the pipeline.
Disclosure of Invention
In order to solve the problems, the invention provides a novel process for lining plastic in a water pipe, which comprises the following steps:
(1) performing shot blasting on the pipe fitting to remove rust and ensure the cleanness of the inner wall of the pipe fitting;
(2) putting the clean pipe fittings on a hanger and sending the pipe fittings into a preheating furnace for preheating;
(3) after preheating, the pipe enters a temperature detection system for temperature detection;
(4) the qualified pipe fittings are detected to enter a spraying room, and electrostatic spraying is carried out on the inner walls of the pipe fittings;
(5) the sprayed pipe fitting enters a thickness detection system to detect the thickness of the coating;
and (5) the workpiece which is detected to be qualified enters an oven to be cured.
Furthermore, in the step (2), a plurality of preheating furnaces are provided, the preheating temperature of the preheating furnace is 250-300 ℃, and the preheating time is 0.5-1.5 h.
Further, the qualified temperature of the temperature detection system in the step (3) is 180-200 ℃.
Further, the thickness detection system in the step (5) detects that the qualified coating thickness is more than or equal to 300 um.
Further, the temperature of the oven in the step (6) is 200 ℃, and the curing time is 0.5-1.5 h.
Further, the temperature of the spray room in the step (4) is 200 ℃, and the substances sprayed by the static electricity are enamel powder.
Further, the rotating speed of the pipe fitting in the step (4) is 60-80r/min, the conveying speed of the pipe fitting in the spraying room is 3-6m/min, the voltage of the spraying gun is 90-100KV, and the current of the spraying gun is 40-50 uA.
The invention has the beneficial effects that:
(1) the coating performance meeting the national standard is obtained by preheating, spray room heating and curing heating for three times, so the steps have the setting of numerical parameters and scientific production according to the method;
(2) the coating has no gas release in the spraying and curing processes, the field environment is clean and tidy, and the environment is protected;
(3) the coating has firm physical properties, good adhesiveness with the pipe fitting and certain ductility, and after cold and hot water is conveyed in the using process of the pipe fitting, the expansion and cold contraction coefficients of the coating are not different from those of the pipe fitting, so that the integrity of the coating is ensured, and the pipeline and a water valve cannot be blocked.
Drawings
FIG. 1 is a flow chart of a novel plastic lining process for a water pipe according to the present invention;
Detailed Description
The invention will be further described with reference to fig. 1 and the specific embodiments, but the invention is not limited to these embodiments.
Example 1
The Q235B steel tube with the inner diameter of the tube fitting being 820mm and the wall thickness being 16mm adopted in the embodiment comprises the following steps:
(1) performing shot blasting on the pipe fitting to remove rust and ensure the cleanness of the inner wall of the pipe fitting;
(2) putting the clean pipe fitting on a hanger, and feeding the pipe fitting into a first preheating furnace for preheating, wherein the temperature of the first preheating furnace is 260 ℃, and the preheating time is 1 h;
(3) after preheating, the pipe enters a temperature detection system for temperature detection;
(4) the pipe fitting with the temperature higher than 180 ℃ is detected to enter a spraying room, the inner wall of the pipe fitting is subjected to electrostatic spraying, when the temperature is detected to be lower than 180 ℃, the pipe fitting is sent back to a second preheating furnace to be continuously preheated, the temperature of the second preheating furnace is 280 ℃, the temperature of the spraying room is 200 ℃, the sprayed substance is enamel powder, the rotating speed of the pipe fitting is 70r/min, the conveying speed of the pipe fitting in the spraying room is 4m/min, the voltage of a spray gun is 90KV, and the current of the spray gun is 40 uA;
(5) the sprayed pipe enters a thickness detection system to detect the thickness of the coating, the coating is qualified when the thickness of the coating is more than or equal to 300um, and the workpiece with the thickness of the coating less than or equal to 300um returns to the spray room to be continuously sprayed;
(6) and (3) curing the qualified workpiece in an oven at the temperature of 200 ℃ for 1 h.
Example 2
The Q235B steel pipe with the pipe fitting inner diameter of 1620mm and the wall thickness of 14mm adopted by the embodiment of the invention comprises the following steps:
(1) performing shot blasting on the pipe fitting to remove rust and ensure the cleanness of the inner wall of the pipe fitting;
(2) putting the clean pipe fitting on a hanger, and feeding the pipe fitting into a first preheating furnace for preheating, wherein the temperature of the first preheating furnace is 280 ℃, and the preheating time is 1.5 hours;
(3) after preheating, the pipe enters a temperature detection system for temperature detection;
(4) the pipe fitting with the temperature higher than 180 ℃ is detected to enter a spraying room, the inner wall of the pipe fitting is subjected to electrostatic spraying, when the temperature is detected to be lower than 180 ℃, the pipe fitting is sent back to a second preheating furnace to be continuously preheated, the temperature of the second preheating furnace is 300 ℃, the temperature of the spraying room is 200 ℃, the sprayed substance is enamel powder, the rotating speed of the pipe fitting is 60r/min, the conveying speed of the pipe fitting in the spraying room is 3m/min, the voltage of a spray gun is 90KV, and the current of the spray gun is 50 uA;
(5) the sprayed pipe enters a thickness detection system to detect the thickness of the coating, the coating is qualified when the thickness of the coating is more than or equal to 300um, and the workpiece with the thickness of the coating less than or equal to 300um returns to the spray room to be continuously sprayed;
(6) and (3) curing the qualified workpiece in an oven at the temperature of 200 ℃ for 1.5 h.
Example 3
The Q345 steel pipe with the pipe fitting inner diameter of 219mm and the wall thickness of 6mm adopted by the embodiment of the invention comprises the following steps:
(1) performing shot blasting on the pipe fitting to remove rust and ensure the cleanness of the inner wall of the pipe fitting;
(2) putting the clean pipe fitting on a hanger, and feeding the pipe fitting into a first preheating furnace for preheating, wherein the temperature of the first preheating furnace is 260 ℃, and the preheating time is 1 h;
(3) after preheating, the pipe enters a temperature detection system for temperature detection;
(4) the pipe fitting with the temperature higher than 180 ℃ is detected to enter a spraying room, the inner wall of the pipe fitting is subjected to electrostatic spraying, when the temperature is detected to be lower than 180 ℃, the pipe fitting is sent back to a second preheating furnace to be continuously preheated, the temperature of the second preheating furnace is 280 ℃, the temperature of the spraying room is 200 ℃, the sprayed substance is enamel powder, the rotating speed of the pipe fitting is 60r/min, the conveying speed of the pipe fitting in the spraying room is 6m/min, the voltage of a spray gun is 90KV, and the current of the spray gun is 40 uA;
(5) the sprayed pipe enters a thickness detection system to detect the thickness of the coating, the coating is qualified when the thickness of the coating is more than or equal to 300um, and the workpiece with the thickness of the coating less than or equal to 300um returns to the spray room to be continuously sprayed;
(6) and (3) curing the qualified workpiece in an oven at the temperature of 200 ℃ for 1 h.
Example 4
The Q345 material 90-degree bent pipe with the inner diameter of 219mm and the wall thickness of 6mm for the pipe fitting adopted by the embodiment of the invention comprises the following steps:
(1) performing shot blasting on the pipe fitting to remove rust and ensure the cleanness of the inner wall of the pipe fitting;
(2) putting the clean pipe fitting on a hanger, and feeding the pipe fitting into a first preheating furnace for preheating, wherein the temperature of the first preheating furnace is 280 ℃, and the preheating time is 0.5 h;
(3) after preheating, the pipe enters a temperature detection system for temperature detection;
(4) the pipe fitting with the temperature higher than 180 ℃ is detected to enter a spraying room, the inner wall of the pipe fitting is subjected to electrostatic spraying, when the temperature is detected to be lower than 180 ℃, the pipe fitting is sent back to a second preheating furnace to be continuously preheated, the temperature of the second preheating furnace is 300 ℃, the temperature of the spraying room is 200 ℃, the sprayed substance is enamel powder, the rotating speed of the pipe fitting is 80r/min, the conveying speed of the pipe fitting in the spraying room is 5m/min, the voltage of a spray gun is 90KV, and the current of the spray gun is 50 uA;
(5) the sprayed pipe enters a thickness detection system to detect the thickness of the coating, the coating is qualified when the thickness of the coating is more than or equal to 300um, and the workpiece with the thickness of the coating less than or equal to 300um returns to the spray room to be continuously sprayed;
(6) and (3) curing the qualified workpiece in an oven at the temperature of 200 ℃ for 1 h.
Comparative example
A Q345 steel pipe with the inner diameter of the pipe fitting being 219mm and the wall thickness being 6mm is adopted, the pipe fitting is preheated to the temperature of 300 ℃, the pipe fitting is taken out, PE particles are manually filled into the pipe fitting, a special tool is used for plugging the bottom and the opening of the pipe fitting, the pipe fitting is placed on a rotating mechanism to rotate, the rotating speed of the pipe fitting is 80r/min, the PE particles are uniformly coated on the inner wall of the pipe fitting, after the PE particles are not enough to melt the PE particles due to the temperature reduction of the pipe fitting, the non-melted PE particles are poured out, the pipe fitting is placed on a support, the temperature of the pipe fitting is reduced, and the PE forms a coating film on the.
The pipes of comparative example 1 of examples 1 to 4 were subjected to the performance test, the test results are shown in Table 1
TABLE 1 test results
From the test results, it is clear that each of the coatings of examples 1 to 4 has high hardness, strong adhesion force, strong impact resistance, and can be adapted to long-term use.
Although the present application has been described with reference to a few embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application as defined by the appended claims.
Claims (7)
1. A novel plastic lining process for a water pipe is characterized by comprising the following steps:
(1) performing shot blasting on the pipe fitting to remove rust and ensure the cleanness of the inner wall of the pipe fitting;
(2) putting the clean pipe fittings on a hanger and sending the pipe fittings into a preheating furnace for preheating;
(3) after preheating, the pipe enters a temperature detection system for temperature detection;
(4) the qualified pipe fittings are detected to enter a spraying room, and electrostatic spraying is carried out on the inner walls of the pipe fittings;
(5) the sprayed pipe fitting enters a thickness detection system to detect the thickness of the coating;
(6) and (5) the workpiece which is detected to be qualified enters an oven to be cured.
2. The process as claimed in claim 1, wherein the preheating furnace in step (2) is multiple, the preheating temperature of the preheating furnace is 250-300 ℃, and the preheating time is 0.5-1.5 h.
3. The novel plastic-lined process for the water pipe as claimed in claim 1, wherein the qualified detection temperature of the temperature detection system in the step (3) is 180-200 ℃.
4. The novel plastic lining process for the water pipe as claimed in claim 1, wherein the thickness of the coating layer which is qualified by the thickness detection system in the step (5) is not less than 300 um.
5. The novel process for lining plastic of the water pipe as claimed in claim 1, wherein the temperature of the oven in the step (6) is 200 ℃, and the curing time is 0.5-1.5 h.
6. The novel plastic lining process for the water pipe as claimed in claim 1, wherein the temperature of the spray booth in the step (4) is 200 ℃, and the substance sprayed electrostatically is enamel powder.
7. The novel plastic lining process for the water pipe as claimed in claim 1, wherein in the step (4), the rotating speed of the pipe is 60-80r/min, the conveying speed of the pipe in the spraying room is 3-6m/min, the voltage of the spraying gun is 90-100KV, and the current of the spraying gun is 40-50 uA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011379204.2A CN112657814A (en) | 2020-11-30 | 2020-11-30 | Novel water pipe inner lining plastic process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011379204.2A CN112657814A (en) | 2020-11-30 | 2020-11-30 | Novel water pipe inner lining plastic process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112657814A true CN112657814A (en) | 2021-04-16 |
Family
ID=75403804
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011379204.2A Pending CN112657814A (en) | 2020-11-30 | 2020-11-30 | Novel water pipe inner lining plastic process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112657814A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6620906B1 (en) * | 2000-02-07 | 2003-09-16 | Bayer Aktiengesellschaft | Method for the production of highly pure polycarbonate and ultrapure polycarbonate |
| CN102553816A (en) * | 2010-12-28 | 2012-07-11 | 上海船舶工艺研究所 | Galvanized pipe plastic coating process |
-
2020
- 2020-11-30 CN CN202011379204.2A patent/CN112657814A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6620906B1 (en) * | 2000-02-07 | 2003-09-16 | Bayer Aktiengesellschaft | Method for the production of highly pure polycarbonate and ultrapure polycarbonate |
| CN102553816A (en) * | 2010-12-28 | 2012-07-11 | 上海船舶工艺研究所 | Galvanized pipe plastic coating process |
Non-Patent Citations (2)
| Title |
|---|
| H.W.杨基: "《机械制造方法（下册）》", 30 November 1988, 高等教育出版社 * |
| 机械工业部仪器仪表工业局: "《仪器仪表机械装校工艺学（上册）》", 30 September 1984, 机械工业出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| MX365209B (en) | Scrap submergence system. | |
| CN103574218B (en) | A kind of pipeline thermal necked material field joints coating technology | |
| CN102128319A (en) | Internally and externally plastic-coated steel-plastic composite pipe and production method thereof | |
| CN103418537A (en) | Internal powder spraying process for petroleum tubes | |
| CN112657814A (en) | Novel water pipe inner lining plastic process | |
| CN206778740U (en) | A kind of steel pipe electrostatic coating machine | |
| EP0468979B1 (en) | Epoxy/polyolefin coating process | |
| US3484266A (en) | Method of internally coating tubular members with glass | |
| CN107511316A (en) | A kind of conveyance conduit bend pipe inner coating process | |
| CN109465161A (en) | A kind of plastic coating method and plastic-coated device of steel pipe | |
| JP4104204B2 (en) | Coating method and coating equipment for deformed pipe inside and outside | |
| US20180361711A1 (en) | Internal anticorrosive and abrasive resistant protection coating for steel pipes | |
| US4493864A (en) | Coated pipe and method of making same | |
| CN108537310B (en) | Cast iron pipe production system and pipe number marking and tracking management method thereof | |
| CN208714477U (en) | A kind of Wiring apparatus enhancing tubing | |
| CN109465159A (en) | A kind of plastic coating method and plastic-coated device | |
| CN201502799U (en) | Plastic-steel compound pipeline with inner erosion resistant coating | |
| US3743470A (en) | Manual beveler and sealer for pipe coatings | |
| JPS5748351A (en) | Gasket for preventing intrusion of powderery body | |
| CN215902124U (en) | Device for solving powder silting problem of fluidized powder coating of nodular cast iron pipe fitting | |
| RU2525031C1 (en) | Method of applying protective coating on inner surface of main pipeline | |
| KR960015379B1 (en) | Method for manufacturing epoxy coating pipe | |
| JPH01164483A (en) | Method for coating inner and outer surface of large-diameter steel pipe | |
| JPH06143417A (en) | Method and device for manufacturing plastic coated steel pipe | |
| JP5976364B2 (en) | Manufacturing method of metal products with shellfish adhesion suppression function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |