CN101468517B - Technological process for coating plastic film in metal tube and equipment for coating film on bell - Google Patents
Technological process for coating plastic film in metal tube and equipment for coating film on bell Download PDFInfo
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- CN101468517B CN101468517B CN2008100894668A CN200810089466A CN101468517B CN 101468517 B CN101468517 B CN 101468517B CN 2008100894668 A CN2008100894668 A CN 2008100894668A CN 200810089466 A CN200810089466 A CN 200810089466A CN 101468517 B CN101468517 B CN 101468517B
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Abstract
The invention relates to a process method for covering a plastic film inside a metal pipe. The method comprises the following steps: a plastic pipe film of which the outside is covered with thermosol and the outside diameter is slightly smaller than the inside diameter is manufactured; the plastic pipe film of which the outside is covered with the thermosol is sent to the inside of the metal pipe; the plastic pipe film of which the outside is covered with the thermosol in a faucet section is turned to the outer surface at the end of a faucet of the metal pipe; film is covered on the faucet section and a straight pipe section of the metal pipe, wherein the method for covering the film on a belled mouth section comprises: the inside of the plastic pipe film of the belled mouth section is sealed through a sealing rubber ring and is gradually injected with boiling water; through pressurization of the boiling water, the plastic pipe film is pressed on the inner wall of the belled mouth section of the metal pipe; residual gas between the plastic pipe film and the inner wall of the metal pipe is sucked out; and the plastic pipe film of the belled mouth section is heated and is stuck on the belled mouth section of the metal pipe. The process method for covering the plastic film inside the metal pipe solves the problems that when two ends of the metal pipe are a faucet and a belled mouth respectively, the caliber of the metal pipe is enlarged, and the belled mouth section with a complex shape is difficult to cover the film.
Description
Technical field
The present invention relates to a kind of with the plastics lining or add the method for sheath, particularly a kind of process of coating plastic film in metal tube and equipment for coating film on bell.
Background technology
Along with continuous progress in science and technology, variation with rapid changepl. never-ending changes and improvements is also taking place in the pipeline industry.The compound pipeline complex pipeline of various structures emerges in an endless stream in the market.Mainly be to consider its sanitation performance with regard to civilian water supply and sewerage pipeline; With regard to the pipeline of media such as industrial low-pressure delivery strong acid and highly basic, mainly be to consider its antiseptic property.
Now, the more typical pipeline that occurs on market, above-mentioned field mainly contains following three kinds: 1, steel is moulded and plastic-aluminum composite pressure pipe; 2, the pure pipe of moulding; 3, compound pipeline complex pipelines such as metal tube inner spraying ring epoxy resins or polyurethane.But they all exist such-and-such drawback.
The 1st kind of steel-plastic composite pressure pipe as previously mentioned, though solved pipeline internal and external anti-corrosive problem well, and aspect pressure-bearing, also improve a lot than the Plastic tube membrane road, but this pipeline only in certain sexual valence advantage is arranged on small-bore (below the DN200), for bigbore pipeline, its price is with regard to suitable height.Up to more than 60 ten thousand yuan, and ductile iron pipe only is more than 30 ten thousand yuan, this shows the difference of the two such as the total cost of every kilometer pipeline of steel wire mesh frame formula steel-plastic composite pressure pipe of DN300.
The 2nd kind of pure pipe of moulding also well solved the sanitation performance problem and the anticorrosion problem of pipeline when carrying low piezodielectric.But he exists problem of ultra-high price equally on the larger caliber pipeline.Because along with the increase of pipe diameter, under the constant situation of bearing capacity, its wall thickness can increase considerably, and this will cause the cost of pipeline to increase thereupon.
Pipelines such as the 3rd kind of metal tube inner spraying ring epoxy resins or polyurethane, though solved the anticorrosion problem of metal tube preferably, but still have following insoluble problem; 1, because As time goes on epoxy resin or polyurethane can constantly wear out, and resinous coat is in a single day aging embrittlement will take place, cause coating sheet obscission, thereby influence the anticorrosive quality of pipeline.2, interior spray polyurethane coating can be separated out a kind of free isocyanates inevitably in long-term use, thereby influences the quality of fluid in the pipeline, if carry drinking water with this kind pipeline, will cause secondary pollution to water quality so.3, no matter be epoxy resin or polyurethane coating, because the limitation of spraying coating process is difficult to eliminate the pin hole phenomenon of coating, thereby the anticorrosive quality of pipeline is had a greatly reduced quality.4, high this class anti-corrosion pipeline cost that causes of material price significantly raises, and makes the general user be difficult to make inquiries.
Chinese patent 02114855.4 (publication number CN1367075A) discloses the manufacture method of the steel-plastics composite pipe that a kind of coating steel pipe and plastics are composited, but when wherein also unresolved metal tube two ends are respectively socket and bellmouth, the film covering method of the socket section that the bore change is big, complex-shaped.
Summary of the invention
For addressing the above problem, when the invention provides a kind of solution metal tube two ends and being respectively socket and bellmouth, bore becomes the process and the equipment for coating film on bell of the coating plastic film in metal tube of big, complex-shaped socket section overlay film.
The present invention is used for the equipment for coating film on bell of coating plastic film in metal tube, and wherein: comprise the bellmouth sealing drum, described bellmouth sealing drum left end end face is fixed with the end-face seal ring of ring-type; Right-hand member is fixed with first gripper shoe in the described bellmouth sealing drum, and center fixed has second gripper shoe, and first gripper shoe is connected by the gripper shoe tube connector with second gripper shoe;
There is the first water-stop gas bag unit in described second gripper shoe left side; The described first water-stop gas bag unit is formed by the gas bag support tube of external refractive index ring shape groove with around tire-like first gas bag of endless groove, described gas bag support tube left end is fixed with the first gas bag support tube side plate, the gas bag inflation inlet on the described first gas bag right side is connected on the gas tube, and gas tube passes described second gripper shoe and described first gripper shoe to the right successively; Left side, the described first water-stop gas bag unit is provided with symmetry placement and the second identical water-stop unit of structure with it, the second gas bag support tube side plate in the second water-stop unit is connected by the side plate tube connector with the first gas bag support tube side plate in the first water-stop unit, and second gas tube of the described second water-stop unit passes described side plate tube connector, described second gripper shoe and described first gripper shoe to the right successively;
The threaded boiling water ascending pipe of right-hand member passes described gripper shoe tube connector, passes and is fixed on the described first gas bag support tube side plate, and left end is fixed on the second gas bag support tube side plate; Boiling water ascending pipe right-hand member is bolted with nut; Boiling water ascending pipe left end has the boiling water hand-hole in the second water-stop unit and the first water-stop unit position intermediate; Blast pipe passes described first gripper shoe, described second gripper shoe and the described first gas bag support tube side plate successively and is fixed on the described first gas bag support tube side plate, and described blast pipe left end is opened on described first gas bag support tube side plate left side;
Described bellmouth sealing drum left end is provided with and vacuumizes the hole, and described vacuumizing is connected with vacuum-pumping tube on the hole.
The process of coating plastic film in metal tube of the present invention comprises the steps:
A, the manufacturing external diameter outer Plastic tube membrane that cover thermosol slightly littler than metal tube internal diameter;
B, the Plastic tube membrane that will cover thermosol are outward sent in the metal tube;
C, the Plastic tube membrane that covers thermosol outward turn over to the outer surface of metal tube socket termination in faucet section;
D, metal tube faucet section, straight length overlay film;
Wherein: the method for the socket section overlay film after the above-mentioned steps is as follows:
1) above-mentioned socket section equipment for coating film is placed in the socket section, give on the straight length inwall that the inflation of second gas bag makes it to be pressed on overlay film, the precession nut makes it to be moved to the left along the boiling water ascending pipe, the end-face seal ring of bellmouth sealing drum left end is pressed on the end face of metal tube, makes it Plastic tube membrane is pressed on the inwall of bellmouth sealing drum for the inflation of first gas bag;
2) use heat hydraulic pressure's pump that boiling water is progressively poured in the Plastic tube membrane inside of socket section;
3) using heat hydraulic pressure's pump to be forced into 0.5MPa to boiling water is pressed on the metal tube socket section inwall Plastic tube membrane;
4) use vavuum pump that the residual gas between Plastic tube membrane and the inner wall of metal tube is extracted out;
5) use heater coil heating socket section and inboard Plastic tube membrane thereof to make its temperature be increased to the melt temperature of Plastic tube membrane outside thermosol.
The process of coating plastic film in metal tube of the present invention, wherein: the step of the faucet section among the step D, straight length overlay film is:
D1, being bled in the space between metal tube and the Plastic tube membrane from socket section adds negative pressure;
The faucet section of D2, heating metal pipe, straight length.
The process of coating plastic film in metal tube of the present invention, wherein: the outer manufacturing step that covers the Plastic tube membrane of thermosol in the steps A is:
A1, mould co-extrusion: the polyethylene of viscous state and PUR respectively by co-extruding mould advance to mould mouthful and glue-feeder enters co-extruding mould, extrude the tubular polyethylene periosteum that covers thermosol outward by co-extrusion die head then;
A2, inflation moulding: to the tubular polyethylene periosteum inner inflatable that just goes out above-mentioned co-extrusion die head, the periosteum size becomes greatly until slightly littler than metal tube internal diameter;
A3, cooling sizing: polyethylene and PUR temperature are cooled to below the glassy state temperature by air-cooled.
The process of coating plastic film in metal tube of the present invention, wherein: described metal tube is a ductile iron pipe.
The process of coating plastic film in metal tube of the present invention has solved the metal tube two ends when being respectively socket and bellmouth, and bore becomes the problem that big, complex-shaped socket section is difficult to overlay film.
Description of drawings
Fig. 1 is the process schematic diagram of faucet section flange;
Fig. 2 is a socket section coating technique schematic diagram;
Fig. 3 is the cutaway view of socket section equipment for coating film in user mode.
The specific embodiment
Be described further below in conjunction with the process of Figure of description coating plastic film in metal tube of the present invention.
Referring to figs. 1 through Fig. 2, the technological process of present embodiment is as follows:
In the following embodiments, plastic foil is a polyethylene periosteum 2, and metal tube is a ductile iron pipe 1, and the two ends of ductile iron pipe 1 are respectively faucet section 11 and socket section 12.
1) polyethylene is extruded: make the granular polyethylene raw material through behind the extruder head, its physical state is an elastomeric state by glassy transition, becomes at last to pass through formed in mould viscous state.
2) PUR is extruded: make granular heat melten gel raw material through behind the extruder head, its physical state is an elastomeric state by glassy transition, becomes at last to pass through formed in mould viscous state.
3) mould co-extrusion: be the polyethylene of viscous state and PUR respectively by co-extruding mould advance to mould mouthful and glue-feeder enters co-extruding mould, extrude the tubular polyethylene periosteum 2 that covers thermosol outward by co-extrusion die head at last.
4) inflation moulding: to tubular polyethylene periosteum 2 inner inflatable that just go out die head, the periosteum size becomes greatly until slightly littler than metal tube internal diameter.
5) cooling sizing: by air-cooled polyethylene and PUR temperature are cooled to below the glassy state temperature, make polyethylene layer and hot melt adhesive layer have enough strength and stiffness, it can be drawn smoothly draw.Determined the final size of periosteum 2 after the cooling.
6) traction: adopt the motor-driven carry-over pinch rolls to draw to being with outer glue-line polyethylene periosteum 2.
7) collect rolling: polyethylene periosteum 2 shapes behind the carry-over pinch rolls are in-line excessively, are subjected to the volume machine that it is collected rolling by special use.
8) ductile iron pipe 1 preliminary treatment: ductile iron pipe 1 is carried out the inner surface rust cleaning, preliminary treatment such as outer surface spray zinc.
9) film feeding and scale cutting: utilize uncoiler that the polyethylene periosteum 2 of rolling is opened, send into ductile iron pipe 1 inside and do the scale cutting with deflector roll.
10) faucet section 11 flange:, utilize flanger that polyethylene periosteum 2 is turned over outer surface (apart from the about 100mm-120mm in socket end) to ductile iron pipe 1 faucet section 11 with reference to Fig. 1.
11) faucet section 11, straight length overlay film: make and form an airtight clearance space between polyethylene periosteum 2 and the ductile iron pipe 1, utilize vacuum pumping tool equipment that it is vacuumized, under vacuum state, utilize heater coil 4 ductile iron pipe 1 evenly to be heated from the socket end, progressively move heating with fixed speed to the bellmouth direction, until the about 100mm of distance bellmouth place, polyethylene periosteum 2 is heated and deliquescing owing to ductile iron pipe 1 temperature heat radiation in this process, polyethylene periosteum 2 is close on ductile iron pipe 1 inwall under negative pressure of vacuum, be heated into hot melt state attached to the PUR on polyethylene periosteum 2 walls this moment, progressively cool off again and polyethylene periosteum 2 and ductile iron pipe 1 are tightly sticked together spray cooling then.
12) socket section 12 overlay films:,, take the special process measure because socket section 12 inner wall shape complexity and polyethylene periosteum 2 amplitude of deformation are bigger with reference to Fig. 3;
This step is used equipment for coating film on bell shown in Figure 3, and wherein: comprise bellmouth sealing drum 6, described bellmouth sealing drum 6 left end end faces are fixed with the end-face seal ring 61 of ring-type; Right-hand member is welded with first gripper shoe 62 in the described bellmouth sealing drum 6, and the centre is welded with second gripper shoe, 63, the first gripper shoes 62 and is connected by gripper shoe tube connector 64 with second gripper shoe 63;
There is the first water-stop gas bag unit in second gripper shoe, 63 left sides; The first water-stop gas bag unit is formed by the gas bag support tube 71 of external refractive index ring shape groove with around tire-like first gas bag 72 of endless groove, gas bag support tube 71 left ends are welded with the first gas bag support tube side plate 73, the gas bag inflation inlet on first gas bag, 72 right sides is connected on the gas tube 74, and gas tube passes second gripper shoe 63 and first gripper shoe 62 to the right successively; Left side, the first water-stop gas bag unit is provided with symmetry placement and the second identical water-stop unit of structure with it, the first gas bag support tube side plate 73 in the second gas bag support tube side plate 77 in the second water-stop unit and the first water-stop unit is connected by side plate tube connector 75, and second gas tube 76 of the second water-stop unit passes side plate tube connector 75, second gripper shoe 63 and first gripper shoe 62 to the right successively;
The threaded boiling water ascending pipe 80 of right-hand member passes gripper shoe tube connector 64, passes and is fixed on the first gas bag support tube side plate 73, and left end is welded on the second gas bag support tube side plate 77; Boiling water ascending pipe 80 right-hand members are bolted with nut 81; Boiling water ascending pipe 80 left ends have boiling water hand-hole 82 in the second water-stop unit and the first water-stop unit position intermediate; Blast pipe 83 passes first gripper shoe 62, second gripper shoe 63 and the first gas bag support tube side plate 73 successively and is fixed on the first gas bag support tube side plate 73, and blast pipe 83 left ends are opened on the described first gas bag support tube side plate 73 left sides;
Bellmouth sealing drum 6 left ends are provided with and vacuumize hole 90, vacuumize and are connected with vacuum-pumping tube 91 on the hole 90.
Specific operation process is as follows:
Equipment for coating film on bell by in the socket section that is placed on ductile iron pipe 1 shown in Figure 3, by second gas bag inflation that second gas tube 76 is given the second water-stop unit, is made it to be pressed on the straight length inwall of the ductile iron pipe 1 of overlay film;
Give first gas bag, 72 inflations of the first water-stop unit, make it polyethylene periosteum 2 is pressed on the inwall of bellmouth sealing drum 6;
The boiling water hand-hole 82 of heat hydraulic pressure's pump that use is connected boiling water ascending pipe 80 right-hand members by boiling water ascending pipe 80 left ends injects space between the second water-stop unit and the first water-stop unit with boiling water, air is wherein discharged gradually by blast pipe 83, behind the full boiling water of this space storage, sealing blast pipe 83, make the hydraulic pressure in this space be increased to 0.5Mpa gradually, polyethylene periosteum 2 deliquescing under the boiling water effect, polyethylene periosteum 2 is pressed on the bellmouth inwall along the complicated shape of bellmouth under pressure, use vavuum pump to vacuumize by vacuum-pumping tube 91 residual gas between polyethylene periosteum 2 and ductile iron pipe 1 inwall is extracted out this moment, use heater coil heating socket section 12 and inboard Plastic tube membrane thereof to make its temperature be increased to the melt temperature of Plastic tube membrane outside thermosol, polyethylene periosteum 2 can progressively be sticked on socket, then with the cooling of normal-temperature water spray.
13) post processing: excision coating technique clout, finishing bell and spigot.
Above embodiment is described preferred implementation of the present invention; be not that scope of the present invention is limited; design under the prerequisite of spirit not breaking away from the present invention; various distortion and improvement that the common engineers and technicians in this area make technical scheme of the present invention all should fall in the definite protection domain of claims of the present invention.
Claims (5)
1. equipment for coating film on bell that is used for coating plastic film in metal tube, it is characterized in that: comprise bellmouth sealing drum (6), described bellmouth sealing drum (6) left end end face is fixed with the end-face seal ring (61) of ring-type; The interior right-hand member of described bellmouth sealing drum (6) is fixed with first gripper shoe (62), and center fixed has second gripper shoe (63), and first gripper shoe (62) is connected by gripper shoe tube connector (64) with second gripper shoe (63);
There is the first water-stop gas bag unit in described second gripper shoe (63) left side; The described first water-stop gas bag unit is formed by the gas bag support tube (71) of external refractive index ring shape groove with around tire-like first gas bag (72) of endless groove, described gas bag support tube (71) left end is fixed with the first gas bag support tube side plate (73), the gas bag inflation inlet on described first gas bag (72) right side is connected on the gas tube (74), and gas tube passes described second gripper shoe (63) and described first gripper shoe (62) to the right successively; Left side, the described first water-stop gas bag unit is provided with symmetry placement and the second identical water-stop unit of structure with it, the second gas bag support tube side plate (77) in the second water-stop unit is connected by side plate tube connector (75) with the first gas bag support tube side plate (73) in the first water-stop unit, and second gas tube (76) of the described second water-stop unit passes described side plate tube connector (75), described second gripper shoe (63) and described first gripper shoe (62) to the right successively;
The threaded boiling water ascending pipe of right-hand member (80) passes described gripper shoe tube connector (64), passes and is fixed on the described first gas bag support tube side plate (73), and left end is fixed on the second gas bag support tube side plate (77); Boiling water ascending pipe (80) right-hand member is bolted with nut (81); Boiling water ascending pipe (80) left end has boiling water hand-hole (82) in the second water-stop unit and the first water-stop unit position intermediate; Blast pipe (83) passes described first gripper shoe (62), described second gripper shoe (63) and the described first gas bag support tube side plate (73) successively and is fixed on the described first gas bag support tube side plate (73), and described blast pipe (83) left end is opened on the described first gas bag support tube side plate (73) left side;
Described bellmouth sealing drum (6) left end is provided with and vacuumizes hole (90), and described vacuumizing is connected with vacuum-pumping tube (91) on the hole (90).
2. the process of a coating plastic film in metal tube comprises the steps:
A, the manufacturing external diameter outer Plastic tube membrane that cover thermosol slightly littler than metal tube internal diameter;
B, the Plastic tube membrane that will cover thermosol are outward sent in the metal tube;
C, the Plastic tube membrane that covers thermosol outward turn over to the outer surface of metal tube socket termination in faucet section;
D, metal tube faucet section, straight length overlay film;
It is characterized in that: the method for the socket section overlay film after the above-mentioned steps is as follows:
1) socket section equipment for coating film as claimed in claim 1 is placed in the socket section, give on the straight length inwall that the inflation of second gas bag makes it to be pressed on overlay film, the precession nut makes it to be moved to the left along the boiling water ascending pipe, the end-face seal ring of bellmouth sealing drum left end is pressed on the end face of metal tube, makes it Plastic tube membrane is pressed on the inwall of bellmouth sealing drum for the inflation of first gas bag;
2) use heat hydraulic pressure's pump that boiling water is progressively poured in the Plastic tube membrane inside of socket section;
3) using heat hydraulic pressure's pump to be forced into 0.5MPa to boiling water is pressed on the metal tube socket section inwall Plastic tube membrane;
4) use vavuum pump that the residual gas between Plastic tube membrane and the inner wall of metal tube is extracted out;
5) use heater coil heating socket section and inboard Plastic tube membrane thereof to make its temperature be increased to the melt temperature of Plastic tube membrane outside thermosol.
3. the process of coating plastic film in metal tube according to claim 2, it is characterized in that: the step of the faucet section among the step D, straight length overlay film is:
D1, being bled in the space between metal tube and the Plastic tube membrane from socket section adds negative pressure;
The faucet section of D2, heating metal pipe, straight length.
4. the process of coating plastic film in metal tube according to claim 3, it is characterized in that: the outer manufacturing step that covers the Plastic tube membrane of thermosol in the steps A is:
A1, mould co-extrusion: the polyethylene of viscous state and PUR respectively by co-extruding mould advance to mould mouthful and glue-feeder enters co-extruding mould, extrude the tubular polyethylene periosteum that covers thermosol outward by co-extrusion die head then;
A2, inflation moulding: to the tubular polyethylene periosteum inner inflatable that just goes out above-mentioned co-extrusion die head, the periosteum size becomes greatly until slightly littler than metal tube internal diameter;
A3, cooling sizing: polyethylene and PUR temperature are cooled to below the glassy state temperature by air-cooled.
5. the process of coating plastic film in metal tube according to claim 4, it is characterized in that: described metal tube is a ductile iron pipe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100894668A CN101468517B (en) | 2008-04-01 | 2008-04-01 | Technological process for coating plastic film in metal tube and equipment for coating film on bell |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100894668A CN101468517B (en) | 2008-04-01 | 2008-04-01 | Technological process for coating plastic film in metal tube and equipment for coating film on bell |
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| CN101468517A CN101468517A (en) | 2009-07-01 |
| CN101468517B true CN101468517B (en) | 2011-11-30 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101695867B (en) * | 2009-10-27 | 2012-01-18 | 新兴铸管股份有限公司 | Method and device for sticking plastic film on internal and external surfaces and end surface of metal tube |
| CN102555200B (en) * | 2012-01-31 | 2016-08-03 | 何军 | Polyethylene winding structure wall tube bellmouth forming mold |
| CN106594406B (en) * | 2017-02-16 | 2017-11-21 | 湖南振辉管业有限公司 | A kind of inner lining plastic tube cast iron pipe and its manufacture method |
| CN106907530B (en) * | 2017-03-24 | 2017-12-05 | 肖和飞 | A kind of inner lining plastic tube metal tube and its manufacture method |
| CN113263734B (en) * | 2021-05-17 | 2022-04-08 | 安徽国登新材料科技有限公司 | Steel-plastic composite pipe forming processing method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5566719A (en) * | 1994-07-05 | 1996-10-22 | Shonan Gosei-Jushi Seisakusho K.K. | Method for lining a branch pipe of an underground pipe |
| CN1336504A (en) * | 2000-07-27 | 2002-02-20 | 成都市同高通讯有限公司 | Composite seam-less steel pipe with thermocompressed plastic and its manufacture |
-
2008
- 2008-04-01 CN CN2008100894668A patent/CN101468517B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5566719A (en) * | 1994-07-05 | 1996-10-22 | Shonan Gosei-Jushi Seisakusho K.K. | Method for lining a branch pipe of an underground pipe |
| CN1336504A (en) * | 2000-07-27 | 2002-02-20 | 成都市同高通讯有限公司 | Composite seam-less steel pipe with thermocompressed plastic and its manufacture |
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