CN111300811B - Strong acid and alkali resistant center reinforced positive and negative pressure resistant inner and outer lining tetrafluoro pipeline and manufacturing process - Google Patents
Strong acid and alkali resistant center reinforced positive and negative pressure resistant inner and outer lining tetrafluoro pipeline and manufacturing process Download PDFInfo
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- CN111300811B CN111300811B CN202010116161.2A CN202010116161A CN111300811B CN 111300811 B CN111300811 B CN 111300811B CN 202010116161 A CN202010116161 A CN 202010116161A CN 111300811 B CN111300811 B CN 111300811B
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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
- B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
- B29C63/02—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material
- B29C63/04—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material by folding, winding, bending or the like
- B29C63/06—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material by folding, winding, bending or the like around tubular articles
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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
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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
Abstract
A strong acid and alkali resistant center reinforced positive and negative pressure resistant inner and outer lining polytetrafluoroethylene pipeline and a manufacturing process are provided, wherein a basic lining cylinder is sleeved on a mold core, then a steel mesh cylinder is sleeved on the basic lining cylinder, a polytetrafluoroethylene tape is wound on the steel mesh cylinder, then a filling block is embedded into a mesh of the steel mesh cylinder, finally a glass polytetrafluoroethylene tape is wound on the outermost layer for shaping, and finally the glass polytetrafluoroethylene tape is sent into a sintering furnace for sintering.
Description
Technical Field
The invention relates to the technical field of anticorrosive pipeline preparation processes, in particular to a strong acid and alkali resistant central core reinforced positive and negative pressure resistant inner and outer lining polytetrafluoroethylene pipeline and a manufacturing process thereof.
Background
The steel lining polytetrafluoroethylene anti-corrosion pipeline is widely applied to the fields of power plants, chemical industry, medicine preparation and the like because the lining has good anti-corrosion performance. At present, when a steel-lined polytetrafluoroethylene anti-corrosion pipeline is produced, a steel sleeve inner core is added between two cylindrical polytetrafluoroethylene sleeves, and then sintering is carried out; because the holes are formed in the inner core of the steel sleeve, the hole diameters of the holes are larger, and the distribution distance is also larger, the inner and outer layers of polytetrafluoroethylene sleeves of the inner core of the steel sleeve are not tightly bonded after sintering and melting, and the sintered polytetrafluoroethylene lining is very weak; after a period of use, the polytetrafluoroethylene lining bulges or two layers of polytetrafluoroethylene are separated and generate gaps, thereby influencing the use.
Disclosure of Invention
In view of the above, it is necessary to provide a strong acid and alkali resistant center reinforced positive and negative pressure resistant inner and outer lining tetrafluoro pipe.
And a manufacturing process of the strong acid and alkali resistant reinforced positive and negative pressure resistant inner and outer lining polytetrafluoroethylene pipeline is also necessarily provided.
A strong acid and alkali resistant center reinforced positive and negative pressure resistant inner and outer lining polytetrafluoroethylene pipeline manufacturing process comprises the following steps:
firstly, removing impurities on a mold core to ensure that the outer wall of the mold core is smooth and free of impurities, and then sleeving a base layer lining cylinder on the mold core;
step two, preparing a polytetrafluoroethylene blank lining:
(1) correcting a mold core: sleeving a steel mesh cylinder on the base layer lining cylinder, and tightly attaching the outer wall of the mold core to the inner wall of the base layer lining cylinder by adjusting a screw rod on the mold core on the premise of ensuring the roundness;
(2) primary winding: winding the polytetrafluoroethylene tape layer by layer along the outer wall of the steel mesh cylinder by using a winding machine, wherein the winding thickness is 4-6mm, and winding the polytetrafluoroethylene tape layer by layer in a staggered edge pressing type winding manner when winding the polytetrafluoroethylene tape onto the steel mesh cylinder;
(3) mesh filling: after the primary winding is finished, embedding a polytetrafluoroethylene filling block with the size matched with the mesh on the steel mesh cylinder into the mesh of the steel mesh cylinder, and enabling the polytetrafluoroethylene filling block to be tightly attached to the mesh on the premise of ensuring flatness;
(4) and (3) secondary winding: after the mesh is filled, winding the glass PTFE tape on the PTFE tape by using a winding machine, shaping the primarily wound PTFE tape by using the glass PTFE tape, wherein the winding thickness is 2-4mm, and winding layer by layer in a staggered edge pressing type winding mode during winding;
step three, sintering:
(a) preliminary preheating: during sintering, firstly suspending the prepared polytetrafluoroethylene blank lining in the air, putting the suspended polytetrafluoroethylene blank lining into a sintering furnace, then slowly heating the polytetrafluoroethylene blank lining to 275-285 ℃ according to the heating rate of 5-7 ℃/h, and overturning the polytetrafluoroethylene blank lining in the sintering furnace according to the frequency of overturning once every 25-35 min;
(b) primary heat preservation: when the temperature reaches 275-285 ℃, keeping the temperature constant, preserving the heat for 1-1.5h for the first time, and overturning the polytetrafluoroethylene blank lining in the sintering furnace according to the frequency of overturning once every 25-35 min;
(c) melting: after the primary heat preservation is finished, slowly raising the temperature to 355-365 ℃ according to the temperature rise rate of 8-10 ℃/h, and overturning the polytetrafluoroethylene blank lining in the sintering furnace according to the frequency of overturning once every 25-35min so as to melt and tightly bond the polytetrafluoroethylene filling blocks embedded into the meshes of the steel mesh cylinder and polytetrafluoroethylene tapes on the inner layer and the outer layer of the steel mesh cylinder;
(d) secondary heat preservation: when the temperature reaches 355-365 ℃, keeping the temperature constant, preserving the heat for 1.5-2h, and overturning the polytetrafluoroethylene blank lining in the sintering furnace according to the frequency of overturning once every 25-35 min;
(e) cooling: after the secondary heat preservation is finished, stopping heating the sintering furnace, naturally cooling the temperature in the sintering furnace to 20-25 ℃, and separating the mold core from the polytetrafluoroethylene lining blank to obtain the sintered polytetrafluoroethylene lining blank;
step four, shaping the sintered blank: cutting and trimming the sintered polytetrafluoroethylene lining blank according to the required size, and shaping the cut and trimmed polytetrafluoroethylene lining by using an expansion hoop;
step five, assembling the polytetrafluoroethylene anticorrosive pipeline: and sleeving the shaped polytetrafluoroethylene lining in the metal pipe fitting, flanging and finishing, and then shaping the assembled polytetrafluoroethylene anticorrosive pipeline by using a mold.
The strong acid and alkali resistant center reinforced positive and negative pressure resistant inner and outer lining tetrafluoro pipe is prepared by adopting the manufacturing process of the strong acid and alkali resistant center reinforced positive and negative pressure resistant inner and outer lining tetrafluoro pipe.
By adopting the technical scheme, the invention has the beneficial effects that: the invention firstly sleeves a basic lining cylinder on a mold core, then sleeves a steel mesh cylinder on the basic lining cylinder, then winds a polytetrafluoroethylene tape on the steel mesh cylinder, then embeds the polytetrafluoroethylene tape into meshes of the steel mesh cylinder by using a filling block, finally winds a glass polytetrafluoroethylene tape on the outermost layer for shaping, and finally sends the glass polytetrafluoroethylene tape into a sintering furnace for sintering, so that the polytetrafluoroethylene filling block embedded into the meshes of the steel mesh cylinder and the polytetrafluoroethylene tapes on the inner layer and the outer layer of the steel mesh cylinder are melted and tightly bonded, thereby not only improving the durability and the durability, but also preventing the phenomena that the polytetrafluoroethylene lining is bulged or the two layers of polytetrafluoroethylene are separated and generate gaps after long-term use.
Drawings
FIG. 1 is a schematic structural view of a green polytetrafluoroethylene liner of the present invention prior to sintering.
In the figure: mold core 01, base layer lining cylinder 02, polytetrafluoroethylene tape 03, steel mesh cylinder 04 and glass polytetrafluoroethylene tape 05.
Detailed Description
Referring to fig. 1, an embodiment of the present invention provides a manufacturing process of a strong acid and alkali resistant center reinforced positive and negative pressure resistant inner and outer tetrafluoro lining pipeline, where the manufacturing process of the strong acid and alkali resistant center reinforced positive and negative pressure resistant inner and outer tetrafluoro lining pipeline includes the following steps:
firstly, removing impurities on a mold core 01 to ensure that the outer wall of the mold core 01 is smooth and free of impurities, and then sleeving a base layer lining cylinder 02 on the mold core 01;
step two, preparing a polytetrafluoroethylene blank lining:
(1) correcting a mold core: sleeving a steel mesh cylinder 04 on the base layer lining cylinder 02, and tightly attaching the outer wall of the mold core 01 to the inner wall of the base layer lining cylinder 02 by adjusting a screw on the mold core 01 on the premise of ensuring the roundness;
(2) primary winding: winding the polytetrafluoroethylene tape 03 layer by layer along the outer wall of the steel mesh cylinder 04 by using a winding machine, wherein the winding thickness is 5mm, and when the polytetrafluoroethylene tape 03 is wound on the steel mesh cylinder 04, winding layer by layer in a staggered edge pressing type winding mode;
(3) mesh filling: after the primary winding is finished, polytetrafluoroethylene filling blocks with the sizes matched with meshes on the steel mesh cylinder 04 are embedded into the meshes of the steel mesh cylinder 04, the filling blocks are the same as the meshes in shape and can be regular hexagons or circles, so that the situation that the peripheries of the meshes are not greatly deformed in the heating process can be ensured, meanwhile, the meshes can be filled, the primary wound polytetrafluoroethylene tape 03 can be attached to the base layer lining cylinder 02, and the primary wound polytetrafluoroethylene tape 03 can be better fused and bonded with the base layer lining cylinder 02 after being heated and melted; on the premise of ensuring flatness, the polytetrafluoroethylene filling blocks are tightly attached to the meshes;
(4) and (3) secondary winding: after the mesh is filled, winding the glass polytetrafluoroethylene tape 05 on the polytetrafluoroethylene tape 03 by using a winding machine, wherein the winding thickness is 3mm, and winding layer by layer in a staggered edge pressing type winding manner during winding; during secondary winding, the primarily wound polytetrafluoroethylene tape 03 can be subjected to certain shaping protection to prevent deformation during melting and sintering, and meanwhile, after sintering is completed, natural cooling is performed, so that not only can a protective effect be achieved, but also a heat preservation effect can be achieved, and the internal temperature is slowly reduced;
step three, sintering:
(a) preliminary preheating: during sintering, firstly suspending the prepared polytetrafluoroethylene blank lining in the air, putting the suspended polytetrafluoroethylene blank lining into a sintering furnace, then slowly heating the polytetrafluoroethylene blank lining to 280 ℃ at the heating rate of 6 ℃/h, and overturning the polytetrafluoroethylene blank lining in the sintering furnace at the frequency of overturning every 30 min;
(b) primary heat preservation: when the temperature reaches 280 ℃, keeping the temperature constant, preserving the heat for 1.25h for the first time, and overturning the inner lining of the polytetrafluoroethylene blank in the sintering furnace according to the frequency of overturning once every 30 min;
(c) melting: after the primary heat preservation is finished, slowly raising the temperature to 360 ℃ according to the temperature rise rate of 9 ℃/h, and overturning the inner lining of the polytetrafluoroethylene blank in the sintering furnace according to the frequency of overturning once every 30 min;
(d) secondary heat preservation: when the temperature reaches 360 ℃, keeping the temperature constant, preserving the heat for 1.75h, and overturning the inner lining of the polytetrafluoroethylene blank in the sintering furnace according to the frequency of overturning once every 30 min;
(e) cooling: after the secondary heat preservation is finished, stopping heating the sintering furnace, naturally cooling the temperature in the sintering furnace to 22.5 ℃, and separating the mold core 01 from the polytetrafluoroethylene lining blank to obtain the sintered polytetrafluoroethylene lining blank;
step four, shaping the sintered blank: cutting and trimming the sintered polytetrafluoroethylene lining blank according to the required size, and shaping the cut and trimmed polytetrafluoroethylene lining by using an expansion hoop;
step five, assembling the polytetrafluoroethylene anticorrosive pipeline: and sleeving the shaped polytetrafluoroethylene lining in the metal pipe fitting, flanging and finishing, and then shaping the assembled polytetrafluoroethylene anticorrosive pipeline by using a mold.
The method adopts a staggered edge pressing type winding mode, namely the next layer of winding belt must press the previous layer of winding belt during winding, and the next layer of winding belt must press half of the width of the previous layer of winding belt.
The strong acid and alkali resistant center reinforced positive and negative pressure resistant inner and outer lining tetrafluoro pipe is prepared by adopting the manufacturing process of the strong acid and alkali resistant center reinforced positive and negative pressure resistant inner and outer lining tetrafluoro pipe.
Example 2
A strong acid and alkali resistant center reinforced positive and negative pressure resistant inner and outer lining polytetrafluoroethylene pipeline manufacturing process comprises the following steps:
firstly, removing impurities on a mold core 01 to ensure that the outer wall of the mold core 01 is smooth and free of impurities, and then sleeving a base layer lining cylinder 02 on the mold core 01;
step two, preparing a polytetrafluoroethylene blank lining:
(1) correcting a mold core: sleeving a steel mesh cylinder 04 on the base layer lining cylinder 02, and tightly attaching the outer wall of the mold core 01 to the inner wall of the base layer lining cylinder 02 by adjusting a screw on the mold core 01 on the premise of ensuring the roundness;
(2) primary winding: winding the polytetrafluoroethylene tape 03 layer by layer along the outer wall of the steel mesh cylinder 04 by using a winding machine, wherein the winding thickness is 4mm, and when the polytetrafluoroethylene tape 03 is wound on the steel mesh cylinder 04, winding layer by layer in a staggered edge pressing type winding mode;
(3) mesh filling: after the primary winding is finished, polytetrafluoroethylene filling blocks with the sizes matched with meshes on the steel mesh cylinder 04 are embedded into the meshes of the steel mesh cylinder 04, the filling blocks are the same as the meshes in shape and can be regular hexagons or circles, so that the situation that the peripheries of the meshes are not greatly deformed in the heating process can be ensured, meanwhile, the meshes can be filled, the primary wound polytetrafluoroethylene tape 03 can be attached to the base layer lining cylinder 02, and the primary wound polytetrafluoroethylene tape 03 can be better fused and bonded with the base layer lining cylinder 02 after being heated and melted; on the premise of ensuring flatness, the polytetrafluoroethylene filling blocks are tightly attached to the meshes;
(4) and (3) secondary winding: after the mesh is filled, winding the glass polytetrafluoroethylene tape 05 on the polytetrafluoroethylene tape 03 by using a winding machine, wherein the winding thickness is 2mm, and during winding, winding layer by layer in a staggered edge pressing type winding mode; during secondary winding, the primarily wound polytetrafluoroethylene tape 03 can be subjected to certain shaping protection to prevent deformation during melting and sintering, and meanwhile, after sintering is completed, natural cooling is performed, so that not only can a protective effect be achieved, but also a heat preservation effect can be achieved, and the internal temperature is slowly reduced;
step three, sintering:
(a) preliminary preheating: during sintering, firstly suspending the prepared polytetrafluoroethylene blank lining in the air, putting the suspended polytetrafluoroethylene blank lining into a sintering furnace, then slowly heating the polytetrafluoroethylene blank lining to 275 ℃ according to the heating rate of 5 ℃/h, and overturning the polytetrafluoroethylene blank lining in the sintering furnace according to the frequency of overturning the polytetrafluoroethylene blank lining once every 25 min;
(b) primary heat preservation: when the temperature reaches 275 ℃, keeping the temperature constant, preserving the heat for 1 hour for the first time, and overturning the inner lining of the polytetrafluoroethylene blank in the sintering furnace according to the frequency of overturning once every 25 min;
(c) melting: after the primary heat preservation is finished, slowly raising the temperature to 355 ℃ according to the temperature rise rate of 8 ℃/h, and overturning the inner lining of the polytetrafluoroethylene blank in the sintering furnace according to the frequency of overturning once every 25 min;
(d) secondary heat preservation: when the temperature reaches 355 ℃, keeping the temperature constant, preserving the heat for 1.5h, and overturning the inner lining of the polytetrafluoroethylene blank in the sintering furnace according to the frequency of overturning once every 25 min;
(e) cooling: after the secondary heat preservation is finished, stopping heating the sintering furnace, naturally cooling the temperature in the sintering furnace to 20 ℃, and separating the mold core 01 from the polytetrafluoroethylene lining blank to obtain the sintered polytetrafluoroethylene lining blank;
step four, shaping the sintered blank: cutting and trimming the sintered polytetrafluoroethylene lining blank according to the required size, and shaping the cut and trimmed polytetrafluoroethylene lining by using an expansion hoop;
step five, assembling the polytetrafluoroethylene anticorrosive pipeline: and sleeving the shaped polytetrafluoroethylene lining in the metal pipe fitting, flanging and finishing, and then shaping the assembled polytetrafluoroethylene anticorrosive pipeline by using a mold.
The method adopts a staggered edge pressing type winding mode, namely the next layer of winding belt must press the previous layer of winding belt during winding, and the next layer of winding belt must press half of the width of the previous layer of winding belt.
Example 3
A strong acid and alkali resistant center reinforced positive and negative pressure resistant inner and outer lining polytetrafluoroethylene pipeline manufacturing process comprises the following steps:
firstly, removing impurities on a mold core 01 to ensure that the outer wall of the mold core 01 is smooth and free of impurities, and then sleeving a base layer lining cylinder 02 on the mold core 01;
step two, preparing a polytetrafluoroethylene blank lining:
(1) correcting a mold core: sleeving a steel mesh cylinder 04 on the base layer lining cylinder 02, and tightly attaching the outer wall of the mold core 01 to the inner wall of the base layer lining cylinder 02 by adjusting a screw on the mold core 01 on the premise of ensuring the roundness;
(2) primary winding: winding the polytetrafluoroethylene tape 03 layer by layer along the outer wall of the steel mesh cylinder 04 by using a winding machine, wherein the winding thickness is 6mm, and when the polytetrafluoroethylene tape 03 is wound on the steel mesh cylinder 04, winding layer by layer in a staggered edge pressing type winding mode;
(3) mesh filling: after the primary winding is finished, polytetrafluoroethylene filling blocks with the sizes matched with meshes on the steel mesh cylinder 04 are embedded into the meshes of the steel mesh cylinder 04, the filling blocks are the same as the meshes in shape and can be regular hexagons or circles, so that the situation that the peripheries of the meshes are not greatly deformed in the heating process can be ensured, meanwhile, the meshes can be filled, the primary wound polytetrafluoroethylene tape 03 can be attached to the base layer lining cylinder 02, and the primary wound polytetrafluoroethylene tape 03 can be better fused and bonded with the base layer lining cylinder 02 after being heated and melted; on the premise of ensuring flatness, the polytetrafluoroethylene filling blocks are tightly attached to the meshes;
(4) and (3) secondary winding: after the mesh is filled, winding the glass polytetrafluoroethylene tape 05 on the polytetrafluoroethylene tape 03 by using a winding machine, wherein the winding thickness is 4mm, and winding layer by layer in a staggered edge pressing type winding manner during winding; during secondary winding, the primarily wound polytetrafluoroethylene tape 03 can be subjected to certain shaping protection to prevent deformation during melting and sintering, and meanwhile, after sintering is completed, natural cooling is performed, so that not only can a protective effect be achieved, but also a heat preservation effect can be achieved, and the internal temperature is slowly reduced;
step three, sintering:
(a) preliminary preheating: during sintering, firstly suspending the prepared polytetrafluoroethylene blank lining in the air, putting the suspended polytetrafluoroethylene blank lining into a sintering furnace, then slowly heating the polytetrafluoroethylene blank lining to 285 ℃ according to the heating rate of 7 ℃/h, and overturning the polytetrafluoroethylene blank lining in the sintering furnace according to the frequency of overturning every 35 min;
(b) primary heat preservation: when the temperature reaches 285 ℃, keeping the temperature constant, preserving the heat for 1.5h for the first time, and overturning the inner lining of the polytetrafluoroethylene blank in the sintering furnace according to the frequency of overturning once every 35 min;
(c) melting: after the primary heat preservation is finished, slowly raising the temperature to 365 ℃ according to the temperature rise rate of 10 ℃/h, and overturning the inner lining of the polytetrafluoroethylene blank in the sintering furnace according to the frequency of overturning once every 35 min;
(d) secondary heat preservation: when the temperature reaches 365 ℃, keeping the temperature constant, preserving the heat for 2 hours, and overturning the inner lining of the polytetrafluoroethylene blank in the sintering furnace according to the frequency of overturning once every 35 min;
(e) cooling: after the secondary heat preservation is finished, stopping heating the sintering furnace, naturally cooling the temperature in the sintering furnace to 25 ℃, and separating the mold core 01 from the polytetrafluoroethylene lining blank to obtain the sintered polytetrafluoroethylene lining blank;
step four, shaping the sintered blank: cutting and trimming the sintered polytetrafluoroethylene lining blank according to the required size, and shaping the cut and trimmed polytetrafluoroethylene lining by using an expansion hoop;
step five, assembling the polytetrafluoroethylene anticorrosive pipeline: and sleeving the shaped polytetrafluoroethylene lining in the metal pipe fitting, flanging and finishing, and then shaping the assembled polytetrafluoroethylene anticorrosive pipeline by using a mold.
The method adopts a staggered edge pressing type winding mode, namely the next layer of winding belt must press the previous layer of winding belt during winding, and the next layer of winding belt must press half of the width of the previous layer of winding belt.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (4)
1. A strong acid and alkali resistant center reinforced positive and negative pressure resistant inner and outer lining polytetrafluoroethylene pipeline manufacturing process is characterized in that: the manufacturing process of the strong acid and alkali resistant center reinforced positive and negative pressure resistant inner and outer lining tetrafluoro pipeline comprises the following steps:
firstly, removing impurities on a mold core to ensure that the outer wall of the mold core is smooth and free of impurities, and then sleeving a base layer lining cylinder on the mold core;
step two, preparing a polytetrafluoroethylene blank lining:
(1) correcting a mold core: sleeving a steel mesh cylinder on the base layer lining cylinder, and tightly attaching the outer wall of the mold core to the inner wall of the base layer lining cylinder by adjusting a screw rod on the mold core on the premise of ensuring the roundness;
(2) primary winding: winding the polytetrafluoroethylene tape layer by layer along the outer wall of the steel mesh cylinder by using a winding machine, wherein the winding thickness is 4-6mm, and winding the polytetrafluoroethylene tape layer by layer in a staggered edge pressing type winding manner when winding the polytetrafluoroethylene tape onto the steel mesh cylinder;
(3) mesh filling: after the primary winding is finished, embedding a polytetrafluoroethylene filling block with the size matched with the mesh on the steel mesh cylinder into the mesh of the steel mesh cylinder, and enabling the polytetrafluoroethylene filling block to be tightly attached to the mesh on the premise of ensuring flatness;
(4) and (3) secondary winding: after the mesh is filled, winding the glass PTFE tape on the PTFE tape by using a winding machine, shaping the primarily wound PTFE tape by using the glass PTFE tape, wherein the winding thickness is 2-4mm, and winding layer by layer in a staggered edge pressing type winding mode during winding;
step three, sintering:
(a) preliminary preheating: during sintering, firstly suspending the prepared polytetrafluoroethylene blank lining in the air, putting the suspended polytetrafluoroethylene blank lining into a sintering furnace, then slowly heating the polytetrafluoroethylene blank lining to 275-285 ℃ according to the heating rate of 5-7 ℃/h, and overturning the polytetrafluoroethylene blank lining in the sintering furnace according to the frequency of overturning once every 25-35 min;
(b) primary heat preservation: when the temperature reaches 275-285 ℃, keeping the temperature constant, preserving the heat for 1-1.5h for the first time, and overturning the polytetrafluoroethylene blank lining in the sintering furnace according to the frequency of overturning once every 25-35 min;
(c) melting: after the primary heat preservation is finished, slowly raising the temperature to 355-365 ℃ according to the temperature rise rate of 8-10 ℃/h, and overturning the polytetrafluoroethylene blank lining in the sintering furnace according to the frequency of overturning once every 25-35min so as to melt and tightly bond the polytetrafluoroethylene filling blocks embedded into the meshes of the steel mesh cylinder and polytetrafluoroethylene tapes on the inner layer and the outer layer of the steel mesh cylinder;
(d) secondary heat preservation: when the temperature reaches 355-365 ℃, keeping the temperature constant, preserving the heat for 1.5-2h, and overturning the polytetrafluoroethylene blank lining in the sintering furnace according to the frequency of overturning once every 25-35 min;
(e) cooling: after the secondary heat preservation is finished, stopping heating the sintering furnace, naturally cooling the temperature in the sintering furnace to 20-25 ℃, and separating the mold core from the polytetrafluoroethylene lining blank to obtain the sintered polytetrafluoroethylene lining blank;
step four, shaping the sintered blank: cutting and trimming the sintered polytetrafluoroethylene lining blank according to the required size, and shaping the cut and trimmed polytetrafluoroethylene lining by using an expansion hoop;
step five, assembling the polytetrafluoroethylene anticorrosive pipeline: and sleeving the shaped polytetrafluoroethylene lining in the metal pipe fitting, flanging and finishing, and then shaping the assembled polytetrafluoroethylene anticorrosive pipeline by using a mold.
2. The manufacturing process of the strong acid and alkali resistant center reinforced positive and negative pressure resistant inner and outer lining tetrafluoro pipe according to claim 1 is characterized in that: the filling blocks are the same as the meshes in shape.
3. The manufacturing process of the strong acid and alkali resistant center reinforced positive and negative pressure resistant inner and outer lining tetrafluoro pipe according to claim 1 is characterized in that: the staggered edge pressing type winding is that the next layer of winding belt must press the previous layer of winding belt when winding, and the next layer of winding belt must press half of the width of the previous layer of winding belt, when winding layer by layer, the winding belt of the previous layer must press the next layer of winding belt, namely, the edge of the next layer of winding belt must be over against the central line of the previous layer of winding belt.
4. The utility model provides a strong acid and alkali resistant center strengthens interior outer lining tetrafluoro pipeline of resistant positive negative pressure which characterized in that: the strong acid and alkali resistant central core reinforced positive and negative pressure resistant inner and outer lining tetrafluoro pipe is prepared by adopting the manufacturing process of the strong acid and alkali resistant central core reinforced positive and negative pressure resistant inner and outer lining tetrafluoro pipe according to any one of claims 1 to 3.
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