CN109483995A - The manufacturing method of resin covering steel pipe - Google Patents
The manufacturing method of resin covering steel pipe Download PDFInfo
- Publication number
- CN109483995A CN109483995A CN201711430101.2A CN201711430101A CN109483995A CN 109483995 A CN109483995 A CN 109483995A CN 201711430101 A CN201711430101 A CN 201711430101A CN 109483995 A CN109483995 A CN 109483995A
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- China
- Prior art keywords
- steel pipe
- resin
- covering
- adhesive
- manufacturing
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
- B32B37/1284—Application of adhesive
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/08—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the cooling method
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
- B32B37/1018—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure using only vacuum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
- B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
- B29L2023/22—Tubes or pipes, i.e. rigid
Landscapes
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The present invention provides a kind of manufacturing method of resin covering steel pipe, it is close to adhesive phase and resin layer well with the surface of steel pipe using same extrusion shaping machine, as soon as applying resin using steel pipe of the metal mold to multiple sizes to cover, the thickness of covering resin can be adjusted by being changed without metal mold.It is close to the adhesive being continuously extruded and resin before the periphery for being attached to steel pipe in the internal superposition of extrusion shaping machine (14), then, adhesive phase (2) after stacking and resin layer (3) are stretched and the space S between adhesive phase (2) and steel pipe (1) is maintained negative pressure state in the outside of punch die and is close to the periphery of steel pipe (1), then, covered resin layer (3) are cooled and solidified.
Description
Technical field
The present invention relates to the resins that at least outer peripheral surface utilized as fuel gas conduit, flow pipe etc. is covered by resin to cover steel
The manufacturing method of pipe.
Background technique
It is covered in the resin that outer peripheral surface, inner peripheral surface are arranged the coating of the resins such as vinyl chloride resin and improve corrosion resistance
Steel pipe as fuel gas conduit, flow pipe, send oil pipe, hot-water heating piping etc. be widely used.
For the resin covers steel pipe, the case where the steel pipe being cut off with predetermined size length applies resin covering
Under, it is carried out using for steel pipe one by one by the method that batch processing bonds pitch tube.
For example, passing through the steel in the coating and preheating that carry out adhesive when the outer peripheral surface of steel pipe applies resin covering
The periphery covering resin pipe of pipe and the method for being heat-shrinked the pitch tube, resin covering is arranged, in addition in the inner peripheral surface of steel pipe
When applying resin covering, by making the pitch tube for being coated with adhesive in the steel pipe of the coating and preheating that carry out adhesive
The method that portion passes through and thermally expands the pitch tube, resin covering is arranged.
However, in the method, the raising of productivity is not implemented, therefore consider to keep predetermined size long using fastener on one side
The steel pipe of degree is sequentially connected (connecting) and the steel pipe is continuously fed to the extrusion shaping machine of resin on one side and applies covering for periphery
Cap rock.
The metal tube of predetermined size length is connected using fastener and is continuously fed to extrusion shaping machine and is applied
Shown in for example following patent documents 1 of the method for the coating of periphery.
The setting period that the patent document 1 is directed to the adhesive being located between resin and metal tube is not specifically mentioned, but
The method (referring to following patent documents 2) and the adhesive of the periphery of metal tube were pre-applied to there is known the adhesive in the past
By the inside of extrusion shaping machine than resin extrusion in advance squeeze out and coat method (referring to following patent documents 3) this two
Kind.
The method of patent document 3 is sequentially extruded three-layer resin covering in same extrusion shaping machine to be covered.It can
Think that the ABS resin initially squeezed out is the adhesive layer for improving the adhesive strength of resin layer for the metalline that the second layer squeezes out.
Patent document 1: Japanese Patent Publication 60-3443 bulletin
Patent document 2: Japanese Unexamined Patent Publication 5-186119 bulletin
Patent document 3: Japanese Unexamined Patent Publication 2011-058605 bulletin
For adhesive phase to be pre-applied to the method for the periphery of metal tube, the low adhesive of viscosity is being used
In the case of, until being covered with resin during coating finish adhesive stablize keep it is more difficult, lack appropriateness.
It is dripped before covering resin and coats Density inhomogeneity, therefore do not obtain the production that bonding force is stable in whole region
Product.Also, this method needs the coating zone of in addition setting adhesive, and production line is elongated.
In addition, method shown in Patent Documents 1 to 3 is at the crosshead die of extrusion shaping machine (hereinafter referred merely to as punch die)
The interior covering for carrying out resin, therefore the thickness of the diameter for the pipe that can be covered and the resin layer covered is according to the metal mold of punch die
Size determines, needs metal mold corresponding with the thickness of each size and the resin layer as target of steel pipe.Accordingly, there exist institute
1 size of meaning: the problem of 1 metal mold.
In addition, also thinking that if generation time lags and covering resin after being coated with adhesive, in adhesive phase and resin
Bubble is enclosed between layer and deteriorates resin layer relative to the close property of adhesive phase.
Resin covers steel pipe and uses in the external screw thread of end processing connection.The externally threaded position is processed to need to peel off
The resin covered generates interlaminar failure when peeling resin layer if resin layer is poor relative to the close property of adhesive phase and glues
Mixture layer remains in the surface for the position that remove, and needs to be additionally carried out the operation of its removing, thus not preferably.
Summary of the invention
For the present invention in order to solve the problem above-mentioned, project is that being able to use same extrusion shaping machine makes adhesive phase and tree
Rouge layer is tightly attached to the surface (outer peripheral surface) of steel pipe well, implements resin coating using steel pipe of the metal mold to multiple sizes
Lid, the thickness of covering resin can be adjusted by being changed without metal mold.
In order to solve above-mentioned problem, in the present invention, a kind of manufacturing method of resin covering steel pipe is provided, by purification
The steel pipe on surface continuously imports the extrusion shaping machine of resin, by work continuously the steel pipe periphery apply adhesive phase and
The manufacturing method of the resin layer being overlapped on the adhesive phase, above-mentioned resin covering steel pipe is characterized in that, makes continuously to be squeezed
Then the overlapped abutting in the inside of adhesive and resin before the periphery for being attached to steel pipe in extrusion shaping machine out makes
The outlet that adhesive phase and resin layer after stacking follow the punch die of extrusion shaping machine while stretching comes out to outside and is being rushed
The outside of mould is close to the periphery of steel pipe, on one side make space between above-mentioned adhesive phase and steel pipe maintain to be negative pressure condition while
The abutting is carried out, then, cools and solidifies covered resin layer.
It may be to make the pipe of predetermined size length to become a succession of using the steel pipe that this method carries out the covering of resin
The mode of pipe connect the steel pipe of (connecting) and any of the steel pipe jointless in the long side direction being continuously manufactured by.
The fastener that the interface between steel pipe is hermetically sealed is preferred to carry out in the connection of the former steel pipe.It connects
Such component for capableing of Reusability described in embodiments of the present invention is preferred in component.
Steel pipe is preferably preheated before adhering to adhesive phase and resin layer.The waste heat is preferably extruded into steel pipe arrival
It is carried out before type machine using induction heating apparatus.
Solidify caused by the cooling of the resin layer covered preferably to become integrated adhesive phase and resin layer attached
Carried out as early as possible after steel pipe.It is dipped in the method for water using the steel pipe for covering resin is imported sink, blows and sprays
Water, refrigerant gas method cooled down.
For the construction for finishing resin covering, cured steel pipe, the defect of covering is checked using pin hole detector.
In addition, for the steel pipe that extrusion shaping machine is connected and be supplied to using fastener, in the defect inspection for finishing covering
It is detected after looking into using end of the eddy current inspection device to connected steel pipe, (is directed to an interconnecting piece in detected position
For two positions) covering is cut off.
In addition, the fastener of interconnecting piece is removed and is returned the steel pipe of predetermined size length, if at the cutting end of resin layer
There are spilling portions, then also carry out its removing.
In addition, if desired, the process for carrying out resin covering in inner surface is then then fed into, for the tree for not needing inner surface
The product of rouge covering applies the product of the resin covering of the inner surface in other places, and progress is faced in order to what is conveyed and take care of
When terminate.
On the other hand, for non-jointed continuous steel pipe, it is cut to specific length after finishing the defect inspection of covering,
If necessary, then it is fed in the process that inner surface carries out resin covering, if not needing the resin coating of next inner surface
Lid then carries out temporarily terminating in order to what is conveyed and take care of.
For such method, make steel pipe in the case where the extrusion condition for making adhesive and resin becomes constant situation
Conveying speed changes and can adjust the amount of tension of resin.By the adjustment of the amount of tension, covering can be arbitrarily adjusted
Thickness.
Space between adhesive phase and steel pipe is maintained negative pressure state and vacuumizing.This is vacuumized by that will squeeze
The air that the entrance of molding machine blocks the sealing device of the entrance in above-mentioned space and is sucked out in the blocked space of entrance out
Suction device combination obtained by equipment carry out.
Gasket also can be set in sealing device, which has a diameter hole smaller than diameter of steel tube, and internal side diameter with
It is close to prevent to invade from external air to above-mentioned space by the periphery of the steel pipe in the hole, and by the elastic bodily form such as rubber
At.
Following device is preferred in the sealing device: squeezing out supplying steel pipe while using fastener joint steel pipe
In the case where molding machine, the staggered positions on the direction of travel of steel pipe and two above-mentioned gaskets are set, in the interconnecting piece of steel pipe
When by a gasket, another gasket is close to the periphery of leading steel pipe or subsequent steel pipe.
In addition, being covered in the resin of the outer peripheral surface of steel pipe, type is not particularly limited.In general, mostly using vinyl chloride resin,
Polyvinyl resin, or polypropylene, vinyl-vinyl acetate copolymer, ABS resin, polyamide, polystyrene etc. other
Resin.
Adhesive selects the adhesive with the good compatibility of the resin covered.For example, being chloroethene in the resin covered
In the case where alkene, the preferably adhesive of Polyester, in addition, in the case where the resin covered is polyethylene, it is preferably poly-
The adhesive of ethylene system.
Manufacturing method according to the invention makes the inner surface of adhesive with the resin covered in advance in extrusion shaping machine
It is close to, therefore can also eliminates hanging down for the adhesive using the low adhesive of viscosity and bonding force can be obtained and existed
The stable product of whole region will not cause the problem of producing wire length.
In addition, the adhesive that is extruded of position come out to outside in the outlet of the punch die from extrusion shaping machine and tree
Lipid phase is for the abutting of the periphery of steel pipe, therefore by 1 size: the unfavorable condition of 1 metal mold is eliminated, and a gold can be utilized
Belong to mould and resin covering is implemented to the steel pipe of multiple sizes.
In addition, the shape of covering is not also influenced by the outlet shapes based on punch die, and become the shape with steel pipe
Similar shape.If the export center of punch die and the center of steel pipe are eccentric, covering becomes that wall unevenness is even to be covered in punch die
Cover material, but the unfavorable condition does not occur.
In addition, being close to adhesive and resin in advance in extrusion shaping machine, therefore the abutting of adhesive phase and resin layer
Property improve, can inhibit removing steel pipe end periphery resin covering when interlaminar failure, so as to expect no adhesive
Remaining removing.
In addition, the space between adhesive phase and steel pipe is maintained be negative pressure condition, therefore adhesive phase and resin layer phase
The close property of steel pipe is improved.
There are the limit for the ability of extrusion shaping machine, as the diameter of the pipe covered becomes larger and the change of the coverage speed of resin
Slowly.Thus, for example, being attached to steel for the covering of the large-diameter pipe as more than 150A (diameter 165.2mm)
The covering of the downside of pipe is sagging due to the influence of gravity, is easy to enclose air between adhesive phase and steel pipe.
The phenomenon makes covering obtained by adhesive and laminated resin in the outside (position come out from outlet of punch die
Set) be attached to it is particularly significant in the case where the periphery of steel pipe.
Method of the invention is asked by the way that the space maintenance between adhesive phase and steel pipe is negative pressure condition to eliminate this
Topic.
In addition, the quick of adhesive phase can be prevented if preheating before adhesive bonding oxidant layer and resin layer to steel pipe
It is cooling, stablize the bonding of resin layer.
In addition, if being quickly cooled down covered resin layer, resin layer rapid curing and be difficult to generate this layer damage,
Deformation.For cooling, the steel pipe after resin is covered is dipped in the method for the water in sink and the method for blowing and spraying water, cold media gas
Cooling is compared, and efficiently and uniformly cooling effect might as well.
In addition, in the case where steel pipe is supplied extrusion shaping machine while using fastener to connect steel pipe, if making
It is provided with the above-mentioned sealing device of two gaskets with the staggered positions on the direction of travel of steel pipe, then will not make steel pipe and glues
The maintenance of the negative pressure state in the space between mixture layer is unstable.This will be described in detail in embodiments.
Detailed description of the invention
Fig. 1 is the figure of the summary of production line used in the implementation of the manufacturing method of the present invention.
Fig. 2 be indicate extrusion shaping machine used in the implementation of the manufacturing method of the present invention punch die in-built one
The cross-sectional view of a example.
Fig. 3 has been expressed as to make to connect and use in such a way that the steel pipe that predetermined size is cut off becomes a series of pipe
Fastener an example cross-sectional view.
Fig. 4 is the perspective view for indicating the interconnecting piece of the steel pipe connected using the fastener of Fig. 3.
Fig. 5 is the cross-sectional view of the interconnecting piece of Fig. 3.
Fig. 6 is to indicate to make adhesive phase and resin layer that the covering obtained by the inner laminated of extrusion shaping machine is rushing in advance
The cross-sectional view for the situation that the outside of mould is close to the periphery of steel pipe.
Fig. 7 is the enlarged cross-sectional view for indicating the details of negative pressure unit shown in Fig. 2.
Fig. 8 is the cross-sectional view of a part for the resin covering steel pipe for indicating to manufacture by means of the present invention.
The explanation of appended drawing reference
1... steel pipe；2... adhesive phase；3... resin layer；4... fastener；4a, 4b... plug；4c... flange；
4d... seal groove；4e...O type ring；10... pipe feedway；11... fastener feedway；12... conveying roller；13...
Preheating device；14... extrusion shaping machine；14a... main body；14b... resin mandrel；14c... molten resin core；14d... mould
Has plate；14e... mold；14f... nozzle；14g... pressure ring；14h... deviation adjusting bolt；14i... adhesive supply dress
It sets；14j... resin feedway；Hp... hopper；AI... adhesive introducing port；RI... resin introducing port；Aa... adhesive
Access；Ra... resin passage；Sa... shared path；15... sealing device；15a... outer cylinder；15b... annular recessed portion；
15c... inner cylinder；15d... gasket；15e... shell；H... hole；16... vacuum evacuation device；16a... suction port；16b...
Vacuum pump；17... negative pressure unit；18... sink；19... pin hole detector；20... eddy current inspection device；21... disconnecting device；
22... trimmer；I~IX... first work station~the 9th work station；L1... the length of the interconnecting piece of steel pipe；L2... two
The setting interval of gasket；C... the interconnecting piece of steel pipe；S... the space of negative pressure state is maintained.
Specific embodiment
Hereinafter, the FIG. 1 to FIG. 8 based on attached drawing, to the embodiment of the manufacturing method of resin covering steel pipe of the invention into
Row explanation.
Fig. 1 is that the steel pipe 1 of predetermined size length is made to continuously feed when being sequentially connected and squeeze out in the periphery of the steel pipe
One example of the production line of covering resin layer.The length of general steel pipe 1 is 4m, 5.5m etc..
Steel pipe is covered as the resin manufactured in the production line of diagram, is to be passed through in the periphery of steel pipe 1 by component shown in Fig. 8
The component that the resin layer 3 for the vinyl chloride having excellent weather resistance is arranged by the adhesive phase 2 being made of the adhesive of Polyester is enumerated
For example, Lai Jinhang the following description.
In the production line of diagram, towards the work station VIII of first work station I~the 8th conveying steel pipe 1, phase is carried out therebetween
The construction of adhesive phase shown in Fig. 82 and resin layer 3, the solidification of resin layer and inspection, steel pipe for the periphery of steel pipe 1
Resin layer cutting at the detection at the steel pipe end at interconnecting piece, steel pipe end and reach the 9th last work station IX.
In the production line, steel pipe 1 is sent out one by one from pipe feedway 10 in first work station I.This first
The steel pipe 1 supplied in work station I becomes Shot Blasting for carrying out steel grit in advance etc. and deteriorates the adhesiveness for making resin outer
The steel pipe of the removings such as the scale on surface.
Next, in second work station II, using the fastener 4 supplied from fastener feedway 11 make steel pipe 1 with according to
The secondary mode as a series of pipe connects.
Fastener 4 uses component as shown in Figure 3.The fastener 4 of Fig. 3 is the component that can be recycled, and is included suitable
Together in leading steel pipe 1-1(diacritic adds for convenience of explanation.Also identical below) and subsequent steel pipe 1-2And it is inserted into
Plug 4a, 4b outstanding in the opposite direction and the flange 4c that is set between two plugs.
In addition, also including between plug 4a and flange 4c and being respectively set between plug 4b and flange 4c
Two at cricoid seal groove 4d and be inserted into each seal groove 4d and be clamped in flange 4c and leading steel pipe 1 respectively-1Between
And flange 4c and subsequent steel pipe 1-2Between o-ring 4e.
Plug 4a, 4b and flange 4c are in in the heart.The flange 4c outer diameter of the fastener 4 of diagram is than steel pipe 1-1、1-2
It is small, but the outer diameter of flange 4c can also be equal with the outer diameter of steel pipe 1.
As shown in Figure 4 and 5, the steel pipe 1 connected using fastener 4 by flange 4c and o-ring 4e be clipped in them it
Between in the state of be connected, become with the component of a series of long size steel pipe equivalence and be continually provided.
For the fastener 4 of illustration, keep plug 4a opposite less than plug 4b relative to the intubating length of steel pipe 1
In the intubating length of steel pipe 1.
The fastener 4 is respectively in leading steel pipe 1-1Posterior medial be inserted into plug 4a, in subsequent steel pipe 1-2Before
Plug 4b is inserted on the inside of portion.
For the steel pipe connected in this way, keeps the conveying speed of rear side very fast compared to front side, produce using subsequent
Steel pipe prevents falling off for plug 4a to press situation as leading steel pipe.
Workability when fastener 4 is in view of extraction and it is preferred that the component illustrated, but the length and plug of plug 4a
Even the equal length of 4b.In addition, seal groove 4d and o-ring 4e only preferred element.
The 12 of Fig. 1 are the conveying rollers for conveying the steel pipe 1 connected in the long side direction, and 13 be to be set to 3rd work station III
Preheating device, 14 be the extrusion shaping machine for being set to the adhesive and covering resin of the 4th work station IV.The extrusion shaping machine
14 have the negative pressure unit 17 that sealing device 15 shown in Fig. 2 is combined with vacuum evacuation device 16 in the inside of entrance.
The steel pipe 1 being supplied to as a series of state is preheated in 3rd work station III as defined temperature, so
Afterwards, the extrusion for importing the extrusion shaping machine 14 of the 4th work station IV and carrying out adhesive phase 2 and resin layer 3 herein covers.
Preheating device 13 is induction heating apparatus, and the flowing of steel pipe 1 before making arrival extrusion molding apparatus 14 has induced current
And it is heated to be temperature appropriate (such as 50 DEG C~150 DEG C or so).For the preheating device 13, if being attached to steel pipe 1
The adhesive of periphery is captured heat and be quickly cooled down by steel pipe, then can produce the case where being unable to get good bonding force, therefore
It carries out in order to prevent the situation.
The preheating of steel pipe in the inside (entrance) of extrusion shaping machine 14 it is also contemplated that carry out, but this method causes to squeeze
The enlargement of molding machine out, therefore in the production line of diagram, preheating device 13 is configured at than extrusion shaping machine 14 by upstream
(nearby) position.
As shown in Fig. 2, extrusion shaping machine 14 has main body 14a, resin mandrel 14b, molten resin core 14c, Die and mould plate
14d, mold 14e, nozzle 14f, pressure ring 14g and deviation adjusting bolt 14h.In addition, having adhesive and resin difference is only
On the spot it is sent into the bonding agent feeding device 14i and resin feedway 14j of the inside of main body 14a.
Resin mandrel 14b is packed into the inside of main body 14a, in the inside of resin mandrel 14b inserted with molten resin core
14c。
In addition, mold 14e is installed on the outlet side of main body 14a via Die and mould plate 14d, nozzle 14f is installed on melting tree
The front end of rouge core 14c is simultaneously concentrically configured in the inside of mold 14e.
Die and mould plate 14d is clamped between main body 14a and pressure ring 14g.Deviation adjusting bolt 14h is to carry out Die and mould plate 14d
Centering bolt, and multiple (three or more) are provided with around Die and mould plate 14d.
It bonds agent feeding device 14i and uses following device (well known device): utilizing cylinder body and loading screw rod therein, column
(not shown) such as plugs and the Polyester jointing material of heating melting is supplied to the inside of main body 14a.
In addition, resin feedway 14j uses (it are also well known device) such as following devices: by base feed resin
The hopper (Hp of Fig. 1) of the vinyl chloride of powder (in the example be), make the heating cylinder body from the hopper Hp resin melting supplied,
And it combines the screw rod (they are also not shown) that molten resin is sent into the inside of main body 14a and obtains.
Adhesive introducing port aI is provided between the main body 14a and resin mandrel 14b of extrusion shaping machine 14 and resin is led
Entrance rI.Adhesive introducing port is provided between the inner peripheral surface of resin mandrel 14b and the outer peripheral surface of molten resin core 14c
AI reaches the adhesive access aa of the rear portion periphery of nozzle 14f, in addition, main body 14a inner peripheral surface and resin mandrel 14b it is outer
The resin passage ra that resin introducing port rI reaches the rear portion inner circumferential of mold 14e is provided between circumferential surface.
In addition, setting makes what resin and adhesive passed through to be total between the inner peripheral surface of mold 14e and the outer peripheral surface of nozzle 14f
With access sa.In addition, producing the element of adhesive access aa, resin passage ra and shared path sa in extrusion shaping machine
Use in proper temperature is heated to by heater.
As being illustrated in detail Fig. 7, sealing device 15 such as lower component by constituting: inner circumferential has annular recessed portion 15b
Outer cylinder 15a；It is inserted into the inner cylinder 15c of the annular recessed portion 15b of the outer cylinder；Be clamped into the inner face of the front and back of annular recessed portion 15b with
The two gasket 15d kept between the end face of the front and back of inner cylinder 15c；And the shell 15e of the periphery of covering outer cylinder.
The hole h that gasket 15d uses the diameter of the steel pipe 1 with diameter than applying resin covering small, and it is tight with internal side diameter
Be affixed on hole h steel pipe 1 periphery by way of the gasket of rubber system that constitutes.Due to for rubber system, so can
Share same object in the sealing of the periphery of the different steel pipe of diameter.
The setting interval L2 of two gasket 15d is set greater than to the length of the interconnecting piece C of steel pipe shown in fig. 5
(interval at the steel pipe end abutted each other) L1.
As a result, interconnecting piece C pass through a gasket 15d when, another gasket 15d be tightly attached to leading steel pipe, after
The periphery of any of continuous steel pipe maintains the pressure of the space S (referring to Fig. 6) of negative pressure state will not be unstable.
In only one sealing device of gasket, when interconnecting piece C passes through the set-point of gasket due to interconnecting piece C
Periphery poor sealing and cause air leakage there are air flow into space S worry.It can be eliminated according to above-mentioned structure
The leakage of air and the worry is solved.
In addition, outer cylinder 15a can airtightly sealed in the inside of shell 15e for the sealing device 15 of diagram
Its between the inner face of shell 15e in the state of radially act.Outer cylinder 15a and the inner cylinder kept by the outer cylinder as a result,
Gasket 15d is remained and is moved in the position contacted with impartial pressure with each section of the periphery of the steel pipe 1 of through hole h by 15c
Make, even if the center of steel pipe vibrates, can also complete the stable periphery sealing based on gasket 15d.
Vacuum evacuation device 16 should using the air attracted in space S using the vacuum pump 16b connecting with suction port 16a
Space S remains the device of negative pressure state.
In extrusion shaping machine 14 shown in Fig. 2, the adhesive that is supplied by adhesive access aa and resin passage ra
Resin layer is overlappingly laminated in the periphery of adhesive phase 2 as shown in Figure 6 during passing through shared path sa with resin
3。
For the stacking, if the adhesive viscosities used are low, the inner surface become in resin layer 3 is coated with bonding
State as oxidant layer 2 and make this two layers abutting.
Adhesive phase 2 and resin layer 3 are in the inside of punch die (mold 14e) holding uncured state and laminated arrangement, at this
It is extruded under state from shared path sa to the outside of punch die.
In the extrusion position, adhesive phase 2 and resin layer 3 are also not and in the inside of molten resin core 14c and nozzle 14f
By steel pipe 1 contact.
That is, as shown in fig. 6, adhesive phase 2 and resin layer 3 that stacking squeezes out are tight in the outside of punch die and the periphery of steel pipe 1
Patch.
At this point, for the adhesive phase 2 and resin layer 3 of stacking supply, by making the extruded velocity of the two compare steel pipe
Movement speed it is fast and be properly tensioned and (thickness of resin layer 3 can be adjusted by controlling the amount of tension), after being stretched
Adhesive phase 2 and resin layer 3 are attached to the periphery of steel pipe 1.
In addition, simultaneously, by the space S between steel pipe 1 and covering (adhesive phase 2), (space S is continuously to sealing device
15 set-point) it vacuumizes and is maintained negative pressure state.
Covering does not carry out with being involved in air relative to the attachment of steel pipe 1 at interface as a result, and the bonding of covering can be obtained
The power product stable in whole region.
As already mentioned, for the covering of the steel pipe bigger than it relative to 150A or diameter, it has to make
The conveying speed of steel pipe reduces.In addition, for from illustrate the case where punch die come out next stacking covering for, temperature is
200 °~230 ° or so, maintain soft state.Therefore, for for the covering of large-diameter pipe, especially under steel pipe
The covering of side due to gravity influence and be easy sagging.
By making space S become negative pressure state, so that the covering to be hung down also is attracted to the periphery of steel pipe, thus, it is possible to
It enough remains the air at the interface of steel pipe and covering to disappear.
The pressure of the space S of the negative pressure state in extrusion shaping machine 14 is maintained to consider the specific gravity of covered resin, viscosity
To determine.
For example, using discharge ability 450kg/h specification extrusion shaping machine and in the steel of 100A (diameter 114.3mm)
In the case that the periphery cladding thickness of pipe is the vinyl chloride resin of 2.0mm, 3mmHg~12mmHg or so is appropriate.
In addition, the condition of negative pressure of 3mmHg~12mmHg is different in the size of the steel pipe covered, the thickness of resin covering
In the case where, it can be used as shared condition and utilize.
The 18 of Fig. 1 are the sinks for being set to t the 5th work station V, and 19 be the pin hole detector for being set to the 6th work station VI,
20 be the eddy current inspection device for being set to the 7th work station VII, 21 be set to the 8th work station VIII follow cutting for travelling
Disconnected device.
The resin for having passed through extrusion shaping machine 14 covers the steel pipe finished and is imported into the sink 18 of t the 5th work station V, soaks
Stain is cooling by uncured resin in the water in sink 18.Sink 18 is to return the water leaked out from the mouth entered and left for steel pipe using pump
Well known cooling trough in slot.
By solidifying covering resin and the cooling of the sink 18, injury, the deformation of resin layer are prevented.Thereafter, for
The resin come out from sink covers the steel pipe finished, checks resin covering using the pin hole detector 19 of the 6th work station VI
Defect.
In addition, being detected by the eddy current inspection device 20 of the 7th work station VII in terms of the outside of the steel pipe after resin covering
What is loseed is respectively at the end of the steel pipe of two positions in each interconnecting piece, in the end of two positions detected, resin layer 3
It is cut off by the disconnecting device 21 of the 8th work station VIII.This cuts through disconnecting device 21 and follows the steel pipe in advancing, and incision is covered
The cutting edge of the device of cover material is carried out around making a circle in the week of steel pipe.
Finish the steel pipe (resin covering steel pipe) of covering cutting in 8th work station VIII in the 9th work station IX
Carry out fastener 4 removes simultaneously cutting, is back to the pipe of predetermined size length.
In the 9th work station IX, be attached the fastener 4 in portion remove and the cutting of each steel pipe 1, if also,
The excision at the spilling end based on trimmer 22 is then carried out there are the spilling of resin layer etc. that pipe end is cut off, also, about completion
The visual observation that product are covered checks and terminates a series of overwrite job.
Thereafter, the process for being then sent to next section if necessary, if not needing, convey, take care of etc.
Terminate.
It is in the past 150A (straight by the diameter that batch processing implements covering according to the method for above-described illustration
Diameter 165.2mm)~200A (diameter 216.3mm) left and right major diameter steel pipe, also can steadily carry out the continuous covering of resin.
In addition, can also carry out covering relative to the resin of the steel pipe of multiple sizes by same metal mold.In reality
In the test of progress, the resin covering of the steel pipe of 12 sizes can be carried out by seven kinds of metal molds.
In addition, the case where above explanation will connect the steel pipe of predetermined size length and continuously be squeezed out, be covered column
It is carried out for for example, but method of the invention is in the non-jointed long ruler being continuously formed by extrusion molding, electric welding
It can also be applied in the resin covering of very little steel pipe.
In the resin covering of non-jointed long size steel pipe, terminating will treated steel pipe after the defect inspection of covering
Terminated with specific length cutting, and is conveyed, taken care of.
Claims (7)
1. the steel pipe for having purified surface, is continuously imported the extrusion molding of resin by a kind of manufacturing method of resin covering steel pipe
Machine, by working continuously in the resin layer periphery of the steel pipe application adhesive phase and be overlapped on the adhesive phase,
The manufacturing method of resin covering steel pipe is characterized in that,
Keep the inside of the adhesive being continuously extruded and resin before the periphery for being attached to steel pipe in extrusion shaping machine mutual
Overlapping is close to, and then, adhesive phase and resin layer after making stacking follow the outlet of the punch die of extrusion shaping machine while stretching
It comes out to outside and is close in the outside of punch die with the periphery of steel pipe, make the space dimension between described adhesive layer and steel pipe on one side
It holds and carries out the abutting on one side for negative pressure state, then, cool and solidify covered resin layer.
2. the manufacturing method of resin covering steel pipe according to claim 1, wherein
Before the adhesive being continuously extruded and resin are attached to the periphery of steel pipe, the steel pipe is preheated.
3. the manufacturing method of resin covering steel pipe according to claim 2, wherein
Before steel pipe reaches the extrusion shaping machine, the preheating of the steel pipe is carried out using induction heating apparatus.
4. the manufacturing method of resin covering steel pipe described in any one of claim 1 to 3, wherein
As the steel pipe, continuously while using fastener to connect the steel pipe of predetermined size length to extrusion shaping machine
Supply, after the cooling for the resin layer for finishing the covering of adhesive phase and resin layer and being covered, implementation has used needle
Then the defect inspection of the covering resin layer of hole detector detects the end of connected steel pipe using eddy current inspection device, examining
Measuring point cuts off covering, carries out the cutting of connected steel pipe and removing for fastener.
5. the manufacturing method of resin covering steel pipe according to claim 4, wherein
The fastener being hermetically sealed using the butt joint interface docked with steel pipe, to carry out the connection of the steel pipe.
6. the manufacturing method of resin covering steel pipe according to claim 4 or 5, wherein
As the extrusion shaping machine, is had using the inside in entrance and combine sealing device with vacuum evacuation device and obtain
Negative pressure unit device, the steel pipe that the gasket having using the sealing device passes through the hole in the gasket
Periphery be sealed, and attract the air in the space using the vacuum evacuation device in this state, thus described in carrying out
The maintenance of the negative pressure state in the space between adhesive phase and steel pipe.
7. the manufacturing method of resin covering steel pipe according to claim 6, wherein
There are two the gaskets for the sealing device tool, and the setting interval of described two gaskets is set greater than steel pipe
The length of interconnecting piece carries out the attraction based on the vacuum evacuation device in the space using the sealing device.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-175009 | 2017-09-12 | ||
| JP2017175009A JP6581633B2 (en) | 2017-09-12 | 2017-09-12 | Manufacturing method of resin-coated steel pipe |
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| CN109483995A true CN109483995A (en) | 2019-03-19 |
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ID=65688607
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| CN201711430101.2A Pending CN109483995A (en) | 2017-09-12 | 2017-12-26 | The manufacturing method of resin covering steel pipe |
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| JP (1) | JP6581633B2 (en) |
| CN (1) | CN109483995A (en) |
| TW (1) | TWI727139B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110435107A (en) * | 2019-09-10 | 2019-11-12 | 大维塑料技术(南京)有限公司 | The laminating product production line of plastic-aluminum |
| CN110667076A (en) * | 2019-08-27 | 2020-01-10 | 浙江立方户外用品股份有限公司 | Automatic processing and forming process for special-shaped section |
| CN112223740A (en) * | 2020-09-17 | 2021-01-15 | 武汉金牛不锈钢管道科技有限公司 | Continuous plastic-coating production process for large-caliber water supply stainless steel pipe |
| CN112643995A (en) * | 2019-10-09 | 2021-04-13 | 戴维斯-标准有限公司 | Polymer pipe forming device with multi-dimensional control system |
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| KR102204970B1 (en) * | 2019-12-11 | 2021-01-19 | 이상덕 | Extruder of heat-shrinkable tube |
| CN113883342A (en) * | 2021-08-31 | 2022-01-04 | 广州文冲船舶修造有限公司 | Monitorable desulfurization discharge outboard pipe and manufacturing process thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110667076A (en) * | 2019-08-27 | 2020-01-10 | 浙江立方户外用品股份有限公司 | Automatic processing and forming process for special-shaped section |
| CN110667076B (en) * | 2019-08-27 | 2021-12-10 | 浙江立方户外用品股份有限公司 | Automatic processing and forming process for special-shaped section |
| CN110435107A (en) * | 2019-09-10 | 2019-11-12 | 大维塑料技术(南京)有限公司 | The laminating product production line of plastic-aluminum |
| CN112643995A (en) * | 2019-10-09 | 2021-04-13 | 戴维斯-标准有限公司 | Polymer pipe forming device with multi-dimensional control system |
| CN112643995B (en) * | 2019-10-09 | 2023-07-28 | 戴维斯-标准有限公司 | Polymer pipe forming device with multidimensional control system |
| CN112223740A (en) * | 2020-09-17 | 2021-01-15 | 武汉金牛不锈钢管道科技有限公司 | Continuous plastic-coating production process for large-caliber water supply stainless steel pipe |
| CN112223740B (en) * | 2020-09-17 | 2022-06-28 | 武汉金牛不锈钢管道科技有限公司 | Continuous plastic-coating production process for large-caliber water supply stainless steel pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6581633B2 (en) | 2019-09-25 |
| TWI727139B (en) | 2021-05-11 |
| TW201912368A (en) | 2019-04-01 |
| JP2019051592A (en) | 2019-04-04 |
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