CN1905956A - Coating method for cast iron pipe fitting joint and the coated castiron pipe joint by polyethyene - Google Patents
Coating method for cast iron pipe fitting joint and the coated castiron pipe joint by polyethyene Download PDFInfo
- Publication number
- CN1905956A CN1905956A CNA2005800017923A CN200580001792A CN1905956A CN 1905956 A CN1905956 A CN 1905956A CN A2005800017923 A CNA2005800017923 A CN A2005800017923A CN 200580001792 A CN200580001792 A CN 200580001792A CN 1905956 A CN1905956 A CN 1905956A
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- China
- Prior art keywords
- cast iron
- iron pipe
- pipe fitting
- fitting joint
- coating
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- 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.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0218—Pretreatment, e.g. heating the substrate
- B05D3/0236—Pretreatment, e.g. heating the substrate with ovens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/002—Processes for applying liquids or other fluent materials the substrate being rotated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
- B05D1/22—Processes for applying liquids or other fluent materials performed by dipping using fluidised-bed technique
- B05D1/24—Applying particulate materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/10—Coatings characterised by the materials used by rubber or plastics
- F16L58/1009—Coatings characterised by the materials used by rubber or plastics the coating being placed inside the pipe
- F16L58/1045—Coatings characterised by the materials used by rubber or plastics the coating being placed inside the pipe the coating being an extruded or a fused layer
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
- F16L9/147—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups comprising only layers of metal and plastics with or without reinforcement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2254/00—Tubes
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
Abstract
Disclosed is a pipe joint for connecting pipes in order to form a pipeline such as a water supply pipeline and a sewerage pipeline, and more particularly to a cast-iron pipe joint in which the inner and outer surfaces thereof are coated with a polyethylene resin. The present invention relates to a cast-iron pipe joint such as L bends, T branches, Y branches, an increaser connecting pipes of different diameters, for connecting pipes in order to form a pipeline. The inner and outer surfaces of the cast-iron pipe joint are coated with a polyethylene resin through a preprocessing process, a heating process, a coating process, and a cooling process. In the coating process, air is blown through a filtering net from the lower side of a coating tank containing polyethylene resin powder, in order to float the polyethylene resin powder. The heated cast-iron pipe joint is introduced into the coating tank, and is rotated so that the polyethylene resin is adhered to the pipe joint. Thereafter, the pipe joint is cooled in cooling water to contract the coating film and gloss the surfaces of the pipe joint.
Description
Technical field
The present invention relates to a kind of connection pipe to form pipeline, for example the pipe of water supply line and sewage conduct connects, and more specifically, relates to a kind of cast iron pipe fitting joint that scribbles polyvinyl resin and applies the method for synthetic resin in the interior appearance of cast iron pipe fitting joint.
Background technology
In general, cast-iron pipe is used for supplying water and blowdown.Use the pipe of different shape to fetch the connection pipe, thereby form pipeline.
In other words, becoming L shaped position to use L type elbow at pipe bending, is the position use T type and the Y type arm of T shape and Y shape at pipeline.In addition, reducing joint is used to connect the pipe of different-diameter, thereby forms pipeline.Forming pipeline by this way needs a large amount of pipes to connect and straight tube.
Traditional cast iron pipe and pipe were connected and are immersed in the coal tar oil sump and scribble coal tar, or scribbled coating (epoxy coating), got rusty preventing.
Coal tar is the final accessory substance behind the crude oil refining, generally is used to pave the way.Coal tar at room temperature is solid-state, is liquid state and can melt after the heating.Coal tar has stickiness, therefore adheres to easily and forms coating.In case stick on the object, it can not separated before the heating once more.In addition, coal tar prevents metal by blocks air and water, iron for example, and what produce when oxidized gets rusty.
Coal tar is cheap also to be easy to be coated in metal, for example on the iron to form coating, be removed by water but through after a while after, understand.Thereby being coated with coal tar is not desirable coating process.
In addition, because coal tar is the final accessory substance of crude oil, it is harmful.And owing to the coal tar that is applied on the cast iron pipe can dissolve in the water gradually, and people will drink into coal tar, thereby coal tar coating is not suitable for water supply line.In addition, after after a while, coal tar and epoxy coating can dissolve in the water, thereby the harmful substance of these dissolvings can be in the human body inner accumulated, thereby produce the Environmental Hormone of infringement human endocrine system normal function.
Consider and prevent that the epoxy coating and the coal tar that get rusty are harmful, and the process preset time is understood dissolved and is removed, make inner surface of pipeline get rusty, also consider the dirt that sticks on the pipe, development also provides a kind of cast iron pipe, wherein the inner surface of water supply line and sewage conduct is formed with polyethylene liner, or outer surface scribbles epoxy resin or polyvinyl resin within it.
Form polyethylene liner by the polyethylene pipe of the last insertion in surface within it in the cast iron pipe, or form polyethylene coating by the coating polyethylene resin, this cast iron pipe is wear-resistant, chemically-resistant medicine, shock resistance and cold-resistant weather, and the mechanical strength that can improve cast iron pipe is resisted external load, for example impacts.
Summary of the invention
Therefore, consider that the problems referred to above propose the present invention, and the purpose of this invention is to provide a kind of cast iron pipe fitting joint that this pipe connects and is used to connect pipe to form pipeline, the surfaces externally and internally that connects at this pipe scribbles polyvinyl resin.Especially, inner surface scribbles the cast iron pipe fitting joint and the desirable pipeline of the common formation of cast iron pipe of coating.
The pipeline that employing pipe according to the present invention connects can be applicable to any pipeline, for example water supply line and blow-off line.Especially, if this cast iron pipe fitting joint is used for blow-off line, then this cast iron pipe fitting joint strong acid refuse that can not contained in the sewage corrodes.
According to the present invention, surfaces externally and internally at cast iron pipe fitting joint scribbles polyvinyl resin, and pipe was connected tube connector in forming pipeline, for example water supply line and blow-off line, this cast iron pipe fitting joint is harmless, and can not produce for example material (Environmental Hormone) of the contaminated environment of coal tar and epoxy coating.And coating procedure is simple and low-cost.In addition, the adhesion strength of the polyvinyl resin of coating is very big, can not be eliminated easily.
Especially, owing to air is blown into polyethylene resin powder so that it suspends, the cast iron pipe fitting joint of rotation heating simultaneously, polyethylene resin powder will be attached on the cast iron pipe fitting joint and form identical thickness like this, and the polyvinyl resin in the coating case can not solidify, and has saved polyvinyl resin.
In addition, when the polyvinyl resin attached to the cast iron pipe fitting joint surfaces externally and internally that heats cools off rapidly with cold water, the surface that pipe connects will be shunk to produce very big polyvinyl resin adhesive force.And pipe connects surperficial glossy and becomes even.
Description of drawings
Following detailed description will make aforementioned and other purposes of the present invention, feature and advantage more apparent in conjunction with the accompanying drawings.
Fig. 1 is the calcspar that is used to illustrate according to manufacture process of the present invention;
Fig. 2 is the generalized section that explanation is used for coating case of the present invention;
Fig. 3 is the generalized section that explanation is used for heating furnace of the present invention; With
Fig. 4 is the generalized section that explanation is used for another kind of heating furnace of the present invention.
The specific embodiment
Now the preferred embodiment for the present invention is done detailed description.
According to the present invention, provide a kind of and be used at L type elbow, T type arm, Y type arm, double-Y shaped arm, do not wait single 90 ° of Y type arms (90 ° of Y branches of unequal single), nontoxic (sanitary) T type arm, do not waited the method that applies synthetic resin such as polyvinyl resin on cast iron pipe fitting joint 11 surfaces externally and internallies of nontoxic T type arm, P type trap, reducing joint and analog, above-mentioned arm or elbow etc. are used to connect pipe to form pipeline.This method comprises: preprocessing process (A) is used for removing and is attached to pipe and connects lip-deep dust, abrasive material and other impurity; Heating process (B) is used for the pipe that heat pre-treatment crosses and connects; Coating procedure (C) is used to melt coating agent and the pipe that this coating agent is coated in heating is connected to form coating; And cooling procedure (D), being used to harden is attached to the coating that pipe connects and makes its cooling.
The step that heating process (B) comprises has: cast iron pipe fitting joint 11 is inserted in the heating furnace 13, and heating furnace 13 has the gas range 14 that comprises a plurality of heated nozzles on inner surface; With heating furnace 13 is heated so that the temperature in the heating furnace 13 is between 330 degrees centigrade to 350 degrees centigrade, the temperature of the cast iron pipe fitting joint of insertion is between 300 degrees centigrade to 320 degrees centigrade.
The step that coating procedure (C) comprises has: cast iron pipe fitting joint 11 is inserted in the coating case 21 that is filled with polyethylene resin powder 16, so that polyethylene resin powder 16 sticks on the cast iron pipe fitting joint 11; Polyethylene resin powder 16 is distributed on the screen pack 22 in the coating case 21, and air can pass through this screen pack 22, and polyethylene resin powder can not be passed through; Use hair-dryer 23 below air to be blown into polyethylene resin powder 16 at screen pack 22, the air that is blown into utilization suspends polyvinyl resin 16; And when cast iron pipe fitting joint 11 rotates, connect 11 surfaces externally and internally at pipe and coat the polyethylene resin powder 16 of suspension, so that the thickness of polyethylene coating is 0.5 millimeter to 1 millimeter.
At cooling procedure (D), the polyethylene coating attached to cast iron pipe fitting joint 11 surfaces externally and internallies that heat is hardened to finish processing procedure.By making its rapid cooling in the water that pipe is connect 11 immersion common room temperature.If the cast iron pipe fitting joint that temperature is approximately 300 degrees centigrade is immersed in the water, then polyethylene layer is cooled off rapidly, and connects on 11 the surfaces externally and internally attached to pipe securely, and to connect 11 surfaces externally and internally all glossy for pipe like this.
Hereinafter, will describe in detail according to process of the present invention.
Preprocessing process (A)
This process is used to clear up prepares coating to obtain the cast iron pipe fitting joint 11 on quality coating surface.In this process, will be created on the rust on cast iron pipe fitting joint 11 surfaces and casting after the molding sand that stays dispose.This process comprises that the pipe that the correction pipe will insert connects terminal internal diameter.
In addition, the high pressure sand grains is sprayed on ball blasting method on the cast iron pipe fitting joint 11 also can be used for removing and be attached to cast iron pipe fitting joint 11 lip-deep rust, dust and other materials, thereby make the surfaces externally and internally of cast iron pipe fitting joint 11 become cleaning.
Heating process (B)
Heating process (B) is used for the heating cast iron pipe and connects 11, and with the polyethylene resin powder fusing, then polyethylene resin powder is connect on 11 attached to pipe.Cast iron pipe fitting joint 11 is inserted in the heating furnace 13 with heating, and heating furnace 13 is equipped with gas range 14.Temperature in the heating furnace 13 is set between 330 degrees centigrade to 350 degrees centigrade, and cast iron pipe fitting joint 11 is heated between 300 degrees centigrade to 320 degrees centigrade.
Preferably, in heating furnace 13, provide the device that is used to transport cast iron pipe fitting joint.For example, the cast iron pipe fitting joint 11 that heat can transmit in heating furnace 13 by belt conveyor, or forms transfer ring 12 at the outer surface of cast iron pipe fitting joint 11, and hangs on the hook.
Coating procedure (C)
The cast iron pipe fitting joint 11 that will be heated to 300 degrees centigrade to 320 degrees centigrade in heating furnace 13 is inserted in the polyethylene resin powder 16, so that polyethylene powders can be attached on the cast iron pipe fitting joint 11.Hair-dryer 23 below blows to air polyethylene powders 16 above the screen pack 22 at coating case 21, so that polyethylene powders 16 suspends and reduces the density of polyethylene powders 16, is filled with polyethylene resin powder 16 in coating case 21.Then, cast iron pipe fitting joint 11 is extend in the coating case 21, and rotation cast iron pipe fitting joint 11, so that polyethylene resin powder 16 is equably attached to the surfaces externally and internally of cast iron pipe fitting joint.
Polyethylene resin powder 16 is by centrifugal force equably on the cast iron pipe fitting joint 11 attached to rotation, and the density of passing through the polyethylene resin powder that air suspends reduces.
Preferably, the thickness of Polyvinyl chloride resin is 0.5 millimeter to 1 millimeter, and can control coating layer thickness arbitrarily by the time that control cast iron pipe fitting joint 11 is immersed in the coating case 21.
Although the coating layer thickness of cast iron pipe fitting joint 11 is to also have the fineness of polyvinyl resin to decide according to the size of cast iron pipe fitting joint 11 and heating-up temperature, can obtain uniform coating layer thickness by controlling coating time and heating-up temperature.
Cooling procedure (D)
If the cast iron pipe fitting joint 11 of the heating that will from coating case 21, take out, cool off by being immersed in the bucket that common room temperature water is housed, the Polyvinyl chloride resin that then is attached to cast iron pipe fitting joint 11 surfaces externally and internallies shrinks, thereby this coating can be securely connects on 11 the surface attached to pipe, and make pipe connect 11 surperficial glossy.
Thereby, coat polyvinyl resin by said method on the surface of cast iron pipe fitting joint.
In addition, transmit, giving in the process of cast iron pipe fitting joint 11 coatings, use pliers to transmit cast iron pipe fitting joint 11, to carry out each processing procedure by preprocessing process (A), heating process (B), coating procedure (C) and cooling procedure (D) for unified.In addition, can connect transfer ring 12 on the surface of cast iron pipe fitting joint 11 by welding, and can hang on the hook to transmit cast iron pipe fitting joint 11.
Transfer ring 12 can form when making cast iron pipe fitting joint 11.
Therefore, the cast iron pipe fitting joint 11 of coating according to the present invention, outer surface has the polyethylene coating of gloss within it.And polyethylene coating has very strong adhesive force, can not separate from cast iron pipe fitting joint 11 with impacting because of heat like this.In addition, this cast iron pipe fitting joint can prevent to get rusty, and has very strong acidproofly or alkaline, and dirt and impurity can not adhere in its surface like this, and its profile can not change to some extent yet, even if through considerable time, thereby has improved the durability that pipe connects.
In addition, if fluorine resin is mixed with polyvinyl resin in the coating case, the polyethylene coating that then contains fluorine resin can easily obtain.
Industrial applicibility
If according to the present invention, connect surfaces externally and internally at the pipe that is used for connecting pipe and scribble polyvinyl resin, then This pipe connects has gloss, and can prevent from getting rusty. In addition, in can preventing that dirt and impurity is attached to that pipe connects Even if the surface is the use of process long duration.
Claims (4)
1. method that is used on the surfaces externally and internally of cast iron pipe fitting joint (11) applying synthetic resin, described cast iron pipe fitting joint (11) be used for connecting pipe with the L type elbow, T type arm, Y type arm, the double-Y shaped arm that form pipeline, do not wait single 90 ° of Y type arms, nontoxic T type arms, do not wait a kind of of nontoxic T type arm, P type trap and reducing joint, this method comprises:
Preprocessing process (A) is used for removing and connects lip-deep dust, abrasive material and other impurity attached to pipe;
Heating process (B) is used for the pipe that heat pre-treatment crosses and connects;
Coating procedure (C) is used to melt coating agent, and the pipe that this coating agent is coated in heating is connected to form coating; With
Cooling procedure (D), being used to harden sticks to the coating that pipe connects and makes its cooling,
Wherein, the step that comprises of heating process (B) is:
Cast iron pipe fitting joint (11) is inserted in the heating furnace (13), and heating furnace (13) has the gas range (14) that comprises a plurality of heated nozzles on inner surface; With
Heating furnace (13) is heated so that heating furnace (13) in temperature between 330 degrees centigrade to 350 degrees centigrade, the temperature of the cast iron pipe fitting joint of insertion between 300 degrees centigrade to 320 degrees centigrade,
And wherein, the step that comprises of coating procedure (C) is:
Cast iron pipe fitting joint (11) is inserted in the coating case (21) that is filled with polyethylene resin powder (16), so that polyethylene resin powder (16) sticks on the cast iron pipe fitting joint (11);
Polyethylene resin powder is distributed on the interior screen pack (22) of coating case (21), and air can pass through this screen pack (22), and polyethylene resin powder can not be passed through;
Use hair-dryer (23) from screen pack (22) below air is blowed to polyethylene resin powder (16), the air that is blown into utilization suspends polyvinyl resin (16); With
When cast iron pipe fitting joint (11) rotated, the surfaces externally and internally that connects (11) at pipe was coated the polyethylene resin powder (16) of suspension.
2. the method for claim 1, wherein the outer surface of cast iron pipe fitting joint (11) is provided with transfer ring (12).
3. cast iron pipe fitting joint, wherein, on the surfaces externally and internally of this cast iron pipe fitting joint, scribble polyvinyl resin, this pipe connects and is used to connect pipe to form pipeline, by heating this cast iron pipe fitting joint (11), and by cast iron pipe fitting joint (11) is immersed in the coating case that is filled with polyethylene resin powder, thereby at the surfaces externally and internally coating thickness of cast iron pipe fitting joint (11) be 0.5 millimeter to 1 millimeter polyethylene resin film.
4. cast iron pipe fitting joint as claimed in claim 3, wherein, the outer surface of cast iron pipe fitting joint (11) is provided with transfer ring (12).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020040105299 | 2004-12-14 | ||
| KR1020040105299 | 2004-12-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1905956A true CN1905956A (en) | 2007-01-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005800017923A Pending CN1905956A (en) | 2004-12-14 | 2005-12-12 | Coating method for cast iron pipe fitting joint and the coated castiron pipe joint by polyethyene |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1905956A (en) |
| WO (1) | WO2006065043A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104019294A (en) * | 2014-05-29 | 2014-09-03 | 东营长城管业有限公司 | Hot-dipping-plastic steel-plastic curve composite pipe production technology |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2537348A1 (en) | 2006-02-22 | 2007-08-22 | Shawcor Ltd. | Coating method for pipe having weld bead |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62234580A (en) * | 1986-04-02 | 1987-10-14 | Kubota Ltd | Method for coating inner surface of metallic pipe |
| KR100243904B1 (en) * | 1997-11-10 | 2000-02-01 | 강의식 | The resin coating method and installation of corrugated steel pipe |
| KR100375772B1 (en) * | 2000-02-10 | 2003-03-28 | 에니 파이프(주) | The internal coating method of a iron and The iron pipe which is internal-coated by this method |
| KR20030021536A (en) * | 2001-09-06 | 2003-03-15 | 삼성전자주식회사 | Management information synchronization method in a network communication system |
| KR100407116B1 (en) * | 2001-11-14 | 2003-11-28 | 주식회사 현대특수강 | 3-Layers Coating Method and Apparatus for Steel Pipe and Fittings by Powder Fusion |
-
2005
- 2005-12-12 WO PCT/KR2005/004241 patent/WO2006065043A1/en active Application Filing
- 2005-12-12 CN CNA2005800017923A patent/CN1905956A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104019294A (en) * | 2014-05-29 | 2014-09-03 | 东营长城管业有限公司 | Hot-dipping-plastic steel-plastic curve composite pipe production technology |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2006065043A1 (en) | 2006-06-22 |
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