CN105856582B - A kind of large-caliber thin-walled polytetrafluoroethylextruded extruded pipe sintering equipment - Google Patents
A kind of large-caliber thin-walled polytetrafluoroethylextruded extruded pipe sintering equipment Download PDFInfo
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- CN105856582B CN105856582B CN201610363821.0A CN201610363821A CN105856582B CN 105856582 B CN105856582 B CN 105856582B CN 201610363821 A CN201610363821 A CN 201610363821A CN 105856582 B CN105856582 B CN 105856582B
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- sintering
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
- B29C69/02—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore of moulding techniques only
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/02—Moulding by agglomerating
- B29C67/04—Sintering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
- B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
- B29K2027/18—PTFE, i.e. polytetrafluorethene, e.g. ePTFE, i.e. expanded polytetrafluorethene
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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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Present invention is disclosed a kind of large-caliber thin-walled polytetrafluoroethylextruded extruded pipe sintering equipment, extrusion equipment, low-temperature drying equipment, high temperature pre-sintering equipment, high-temperature sintering apparatus and draw-gear are pushed including being sequentially provided with vertically, push and connected between extrusion equipment, low-temperature drying equipment, high temperature pre-sintering equipment and high-temperature sintering apparatus by delivery pipe, extruded stock after discharging is passed through into the processes such as low temperature drying, high temperature pre-sintering, high temperature sintering successively by drawing, it is horizontal again after final molding.As a result of using the sintering in vertical direction, so that large-caliber thin-walled polytetrafluoroethylextruded extruded pipe can ensure axiality all the time in sintering process, the defects of so as to avoid that Collapse Deformation occurs, additionally due to there is external traction force, so that the pipe after sintering is more round, wall thickness is evenly.
Description
Technical field
The present invention relates to agglomerating plant, is sintered more specifically to a kind of large-caliber thin-walled polytetrafluoroethylextruded extruded pipe
Device.
Background technology
At present, polytetrafluoroethylextruded extruded pipe has been widely used for field of heat exchange, wherein being mainly less than 16 millis with bore
Based on rice, but for larger caliber, the polytetrafluoroethylextruded extruded pipe of such as more than 30 millimeters bores, it so can not effectively realize work
Industry metaplasia is produced.Itself main reason is that：The more small-bore polytetrafluoroethylextruded extruded pipe of tradition during drying and sintering because its
Caliber is small, thickness of pipe wall (wall thickness is typically the 1/5~1/10 of tube outer diameter), therefore, conveyer belt can be placed directly in sintering
On, high temperature oven is entered laterally without being easily deformed, i.e., traditional handicraft is using horizontal manufacture.If by bigbore thin-walled
Polytetrafluoroethylextruded extruded pipe, which is placed on similar conveyer belt, enters high temperature oven sintering, and because its bore is big, tube wall is thin, and (wall thickness leads to
It is often the 1/40~1/100 of external diameter), when entering high temperature oven, easily cave in downwards, deform and wall thickness differs by generation for tubing
Cause.
In summary, for the polytetrafluoroethylextruded extruded pipe of larger caliber, particularly more than 30 millimeters bores, still using biography
The horizontal processing technology of system, can not be applicable completely, it is necessary to a kind of brand-new process equipment is worked out, it is bigbore to meet
The industrialized production of polytetrafluoroethylextruded extruded pipe.
The content of the invention
The purpose of the present invention aims to provide a kind of large-caliber thin-walled polytetrafluoroethylextruded extruded pipe sintering equipment, can avoid sending out
There is the defects of deformation, tube wall is uneven in raw heavy caliber pipe.
The large-caliber thin-walled polytetrafluoroethylextruded extruded pipe sintering equipment, including vertically on be sequentially provided with pushing extrusion
Equipment, low-temperature drying equipment, high temperature pre-sintering equipment, high-temperature sintering apparatus and draw-gear, push extrusion equipment, low temperature drying
Connected between equipment, high temperature pre-sintering equipment and high-temperature sintering apparatus by delivery pipe, draw-gear has drawing head and traction
Chain, haulage chain are connected to after drawing head, to draw the extruded stock extruded from the die orifice for pushing extrusion equipment, to lead to successively
Low-temperature drying equipment, high temperature pre-sintering equipment, high-temperature sintering apparatus are crossed, are dried respectively, pre-sintered and sinter molding.
Described pressure extrusion equipment, low-temperature drying equipment, high temperature pre-sintering equipment, high-temperature sintering apparatus and draw-gear edge
It is in set gradually from bottom to up in vertical direction.
Described pressure extrusion equipment, low-temperature drying equipment, high temperature pre-sintering equipment, high-temperature sintering apparatus and draw-gear edge
It is in set gradually from top to bottom in vertical direction.
Air exhausting device is additionally provided with described low-temperature drying equipment, air exhausting device has exhaust duct and blower fan, to discharge
The lubricating auxiliary agent evaporated when drying.
The hauling speed of described draw-gear is identical with die orifice discharging speed.
The hauling speed of described draw-gear is controlled in 0.1~2m/min.
The drying temperature of described low-temperature drying equipment is controlled at 50~250 DEG C.
The pre-sintering temperature of described high temperature pre-sintering equipment is controlled at 200~300 DEG C.
The sintering temperature of described high-temperature sintering apparatus is controlled at 300~400 DEG C.
A kind of large-caliber thin-walled polytetrafluoroethylextruded extruded pipe sintering equipment using the present invention has following advantage：
1st, according to thermodynamic principles, heat is to transmit from the bottom up under normal circumstances in atmosphere, thus in vertical direction,
Lower section temperature is low, and more up temperature is higher, sintering polytetrafluoroethylene is heated up in gradient sintering, and shaping is more stable, while this burns
Process advan is tied in the saving energy.
2nd, using the sintering in vertical direction so that large-caliber thin-walled polytetrafluoroethylextruded extruded pipe in sintering process all the time
Axiality can be ensured, so as to avoid occur Collapse Deformation the defects of, additionally due to there is external traction force so that sintering
Pipe afterwards is more round, and wall thickness is evenly.
3rd, liquid transmission can be widely applied to using polytetrafluoroethyltubing tubing made of sintering method of the present invention, gas passes
Send, the various fields such as heat exchange.
4th, using the discharge of the waste gas such as the sintering in vertical direction, lubricating auxiliary agent when being also beneficial to dry.
Brief description of the drawings
In the present invention, identical reference represents identical feature all the time, wherein：
Fig. 1 is an embodiment schematic diagram (setting from bottom to up) for the sintering equipment of the present invention.
16151-1
Embodiment
Technical scheme is further illustrated with reference to the accompanying drawings and examples.
During due to polytetrafluoroethylene (PTFE) more than melting temperature, still without the so-called molten condition of common plasticses, viscosity pole
Greatly, it is not possible to traditional Screw Extrusion technique productions, but use and be first preformed into base rod, then base rod is pushed again
Extrusion.In polytetrafluoroethyltubing tubing extrusion, tradition is the method that extrusion is pushed using horizontal direction, then passes through water again
Square to baking oven carry out high temperature sintering.Such process, it is only capable of the production for meeting small-bore polytetrafluoroethyltubing tubing
Demand, but then easily deformed for heavy caliber pipe, tube wall is uneven etc., because heavy caliber pipe ratio of wall thickness to size
Greatly, and need the long period to sinter, easily the Collapse Deformation in sintering process, be unfavorable for sintering sizing.
Find to be sintered in vertical direction by repeatedly studying and designing, extruding pipe can be ensured in sintering process
Concentricity, therefore, a kind of large-caliber thin-walled polytetrafluoroethylextruded extruded pipe sintering equipment of the invention, including vertically on
It is sequentially provided with and pushes extrusion equipment 1, low-temperature drying equipment 2, high temperature pre-sintering equipment 3, high-temperature sintering apparatus 4 and draw-gear 5,
Push and connected between extrusion equipment 1, low-temperature drying equipment 2, high temperature pre-sintering equipment 3 and high-temperature sintering apparatus 4 by delivery pipe 6
Logical, draw-gear 5 has drawing head 51 and haulage chain 52, and haulage chain 52 is connected to after drawing head 51, right by drawing head 51
Drawn from the extruded stock 8 extruded of die orifice for pushing extrusion equipment 1, and pass sequentially through low-temperature drying equipment 2, high temperature pre-sintering is set
Standby 3, high-temperature sintering apparatus 4, are dried, pre-sintered and sinter molding, finally by the extruding pipe of sinter molding by leading respectively
Whole sintering equipment is drawn, and it is laterally disposed.
As one embodiment, described pressure extrusion equipment, low-temperature drying equipment 2, high temperature pre-sintering equipment 3, high temperature burn
Knot equipment 4 and draw-gear 5 are vertically upper in (such as Fig. 1) is set gradually from bottom to up, so as to carry out successively from bottom to top
Dry, pre-sintered and sinter molding.
As another embodiment, described pressure extrusion equipment, low-temperature drying equipment 2, high temperature pre-sintering equipment 3, high temperature burn
Knot equipment 4 and draw-gear 5 are vertically upper in setting gradually from top to bottom, so as to be dried successively from the top down, in advance
Sintering and sinter molding.Its principle is substantially identical with setting gradually from bottom to up, is also fully able to realize the purpose of the present invention.
Air exhausting device is additionally provided with described low-temperature drying equipment 2, air exhausting device has exhaust duct 7 and blower fan, passes through wind
Machine, by lubricating auxiliary agent volatilized when being dried into low-temperature drying equipment 2 etc.
16151-1 waste gas is discharged.
In whole distraction procedure, hauling speed and the die orifice discharging speed of draw-gear 5 are consistent.As a reality
Example is applied, it is preferable that the hauling speed of described draw-gear 5, which is controlled in 0.1~2m/min,.
And pass through multiple repetition test and calculating, the drying temperature of described low-temperature drying equipment 2 is controlled 50~250
℃.The pre-sintering temperature of described high temperature pre-sintering equipment 3 is controlled at 200~300 DEG C.By described high-temperature sintering apparatus 4
Sintering temperature control at 300~400 DEG C.
Polytetrafluoroethyltubing tubing made of sintering method through the present invention can be widely applied to liquid transmission, gas transmits,
The various fields such as heat exchange, have the characteristics that：
1st, corrosion resistance, polytetrafluoroethylene (PTFE) has the performances such as good strong alkali-acid resistance in itself, because high temperature sintering is abundant,
There is no hole in polytetrafluoroethyltubing tubing completely, compactness is good, and density is in 2.1~2.2g/cm3Between, extensively can should for a long time
For heat-exchange tube, the transmission of various liquid, gas transmission needed for various field of heat exchange without leakage, infiltration occurs.
2nd, resistant of high or low temperature, polytetrafluoroethyltubing tubing temperature in use made of this sintering process can -50~260 DEG C it
Between, at 230 DEG C, burst pressure is up to 2kg/cm2, ensure matchmaker of the polytetrafluoroethyltubing tubing as the heat transferring medium of different temperatures
It is situated between, has and be not directly contacted with mutually between good dimensional stability and heat transferring medium, so as to avoids various possible generations
Unsafe factor.
3rd, heat transfer efficient, it is 0.184w/ because the heat transfer coefficient of polytetrafluoroethylene (PTFE) is the 1/250 of ordinary carbon steel
(mK), so to ensure higher heat exchanger effectiveness, tube wall gets over Bao Yuehao, so the polyfluortetraethylene pipe of word sintering process
Material, tube wall can be with thin to the 1/40~1/100 of caliber.
In summary, using the sintering equipment of the present invention, made suitable for the polytetrafluoroethyltubing tubing of various bores, especially
Polytetrafluoroethyltubing tubing suitable for heavy caliber (30 millimeters with), thin pipe wall (wall thickness is typically the 1/40~1/100 of external diameter) is processed
Make, be fully able to avoid the defects of discovery deforms, tube wall is uneven.
Those of ordinary skill in the art is it should be appreciated that the specification of the above is only the numerous embodiments of the present invention
In one or more of embodiments, and not use limitation of the invention.Any equalization for embodiment described above becomes
The technical schemes such as change, modification and equivalent substitute, as long as meeting the spirit of the present invention, it will all fall the power in the present invention
In the range of sharp claim is protected.
Claims (6)
- A kind of 1. large-caliber thin-walled polytetrafluoroethylextruded extruded pipe sintering equipment, it is characterised in that including on vertically successively Provided with extrusion equipment, low-temperature drying equipment, high temperature pre-sintering equipment, high-temperature sintering apparatus and draw-gear is pushed, extrusion is pushed Connected between equipment, low-temperature drying equipment, high temperature pre-sintering equipment and high-temperature sintering apparatus by delivery pipe, draw-gear has Drawing head and haulage chain, haulage chain are connected to after drawing head, are squeezed to draw from what the die orifice for pushing extrusion equipment was extruded Discharging, to pass sequentially through low-temperature drying equipment, high temperature pre-sintering equipment, high-temperature sintering apparatus, be dried respectively, it is pre-sintered and Sinter molding；Described pushing extrusion equipment, low-temperature drying equipment, high temperature pre-sintering equipment, high-temperature sintering apparatus and draw-gear edge It is in set gradually from bottom to up in vertical direction；The hauling speed of described draw-gear is identical with die orifice discharging speed.
- A kind of 2. large-caliber thin-walled polytetrafluoroethylextruded extruded pipe sintering equipment as claimed in claim 1, it is characterised in that：It is described Low-temperature drying equipment on be additionally provided with air exhausting device, air exhausting device has exhaust duct and blower fan, evaporates during discharging dry Lubricating auxiliary agent.
- A kind of 3. large-caliber thin-walled polytetrafluoroethylextruded extruded pipe sintering equipment as claimed in claim 1, it is characterised in that：It is described Draw-gear hauling speed control in 0.1~2m/min.
- A kind of 4. large-caliber thin-walled polytetrafluoroethylextruded extruded pipe sintering equipment as claimed in claim 1, it is characterised in that：It is described Low-temperature drying equipment drying temperature control at 50~250 DEG C.
- A kind of 5. large-caliber thin-walled polytetrafluoroethylextruded extruded pipe sintering equipment as claimed in claim 1, it is characterised in that：It is described High temperature pre-sintering equipment pre-sintering temperature control at 200~300 DEG C.
- A kind of 6. large-caliber thin-walled polytetrafluoroethylextruded extruded pipe sintering equipment as claimed in claim 1, it is characterised in that：It is described High-temperature sintering apparatus sintering temperature control at 300~400 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610363821.0A CN105856582B (en) | 2016-05-26 | 2016-05-26 | A kind of large-caliber thin-walled polytetrafluoroethylextruded extruded pipe sintering equipment |
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| CN201610363821.0A CN105856582B (en) | 2016-05-26 | 2016-05-26 | A kind of large-caliber thin-walled polytetrafluoroethylextruded extruded pipe sintering equipment |
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| CN105856582A CN105856582A (en) | 2016-08-17 |
| CN105856582B true CN105856582B (en) | 2018-02-27 |
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| CN106554589A (en) * | 2016-10-14 | 2017-04-05 | 上海吾牛氟塑管业有限公司 | Enhanced polytetrafluoroethylene dispersion resin pipe |
| CN109910269A (en) * | 2019-01-29 | 2019-06-21 | 芜湖航天特种电缆厂股份有限公司 | Cable for aerospace polytetrafluoroethylsheath sheath and preparation method thereof |
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| CN102205651B (en) * | 2010-12-24 | 2015-11-25 | 广东新志密封技术有限公司 | A kind of method of sintering polytetrafluoroethylene |
| CN203844239U (en) * | 2014-03-14 | 2014-09-24 | 青岛远东富隆新材料有限公司 | High-efficiency sintering furnace of polytetrafluoroethylene tubes |
| CN103978709B (en) * | 2014-05-12 | 2016-04-13 | 四会市生料带厂有限公司 | A kind of preparation method of polytetrafluoroethylene (PTFE) reinforced pipe |
| CN205167594U (en) * | 2015-12-09 | 2016-04-20 | 东莞市格尼斯电子有限公司 | Pyrocondensation pipe former |
| CN205767573U (en) * | 2016-05-26 | 2016-12-07 | 江苏金由新材料有限公司 | A kind of large-caliber thin-walled polytetrafluoroethylextruded extruded pipe sintering equipment |
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