CN114274440A - Die pressing process and device for steel lining polytetrafluoroethylene straight pipe - Google Patents
Die pressing process and device for steel lining polytetrafluoroethylene straight pipe Download PDFInfo
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- CN114274440A CN114274440A CN202111549524.2A CN202111549524A CN114274440A CN 114274440 A CN114274440 A CN 114274440A CN 202111549524 A CN202111549524 A CN 202111549524A CN 114274440 A CN114274440 A CN 114274440A
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Abstract
The invention relates to the technical field of pipeline manufacturing equipment, and particularly discloses a die pressing process and a die pressing device for a steel-lined polytetrafluoroethylene straight pipe, wherein the straight pipe and a flange are welded, and are pretreated; putting one end of a straight pipe into a die pressing device, pouring a PTFE finished product into the die pressing device to enable the inner liner layer to be tightly combined with the steel part, sealing the die pressing device, and heating the straight pipe to enable PTFE to be tightly attached to the inner surface wall of the straight pipe; heating to 170-190 ℃ by adopting an electric furnace, preserving the heat for 2-4 hours, and naturally cooling. PTFE is poured in firstly and then the steel pipe is heated, so that the PTFE can be tightly attached to the inner surface wall of the steel pipe.
Description
Technical Field
The invention relates to the technical field of pipeline manufacturing equipment, in particular to a die pressing process and a die pressing device for a steel lining polytetrafluoroethylene straight pipe.
Background
At present, the steel-lined tetrafluoroethylene pipe consists of a steel pipe and an inner lining layer, wherein the lining layer comprises an innermost layer made of polytetrafluoroethylene, the polytetrafluoroethylene has high chemical stability, can resist almost all common strong corrosion chemicals, and has the characteristic of high temperature resistance, so that the steel-lined tetrafluoroethylene pipe is an ideal corrosion material.
However, the tetrafluoroethylene pipe is directly inserted into the steel pipe, and after long-term use, the steel pipe and the tetrafluoroethylene pipe are in poor contact, and a gap exists in the middle of the steel pipe, which affects the service life of the steel-lined tetrafluoroethylene pipe.
Disclosure of Invention
The invention aims to provide a die pressing process and a die pressing device for a steel lining polytetrafluoroethylene straight pipe, and aims to solve the technical problems that in the prior art, a polytetrafluoroethylene pipe is directly embedded into a steel pipe, the steel pipe is in poor contact with the polytetrafluoroethylene pipe after long-time use, a gap exists in the middle of the steel pipe, and the service life of the steel lining polytetrafluoroethylene pipe is influenced.
In order to realize the purpose, the invention adopts a die pressing process of a steel lining polytetrafluoroethylene straight pipe, which comprises the following steps:
welding a straight pipe and a flange, and pretreating the straight pipe and the flange;
putting one end of the straight pipe into a die pressing device, pouring a PTFE finished product to enable an inner liner layer to be tightly combined with a steel part, sealing the die pressing device, and heating the straight pipe to enable the PTFE to be tightly attached to the inner surface wall of the straight pipe;
heating to 170-190 ℃ by adopting an electric furnace, preserving the heat for 2-4 hours, and naturally cooling.
Wherein, prior to the step of pouring the finished PTFE product: and coating an anti-sticking agent inside the molding device.
Wherein the anti-sticking agent is any one of PVA aqueous solution, polystyrene solution, silicone rubber solution, emulsified silicone oil, stearic acid solution, paraffin wax solution and mineral oil.
Wherein, after the temperature is raised to 170-190 ℃ by adopting an electric furnace and is preserved for 2-4 hours, the step of natural cooling is followed: and carrying out water pressure test at 1.3-1.7 times of design pressure.
Wherein, after the water pressure test, the integrity test is carried out, and the leakage point detection method adopts an electric spark test.
The invention also provides a die pressing device for the steel-lined polytetrafluoroethylene straight pipe, which adopts the die pressing process for the steel-lined polytetrafluoroethylene straight pipe and comprises a base, positioning rings, a central column, a surrounding plate, a cover plate, positioning columns and two fixers, wherein the positioning rings are fixedly connected with the base and positioned above the base, the central column is fixedly connected with the base and positioned above the base, the number of the positioning columns is two, the two positioning columns are respectively and fixedly connected with the base and respectively positioned above the base, the surrounding plate is in sliding connection with the two positioning columns, the two positioning columns respectively penetrate through the surrounding plate, the cover plate is in sliding connection with the two positioning columns and the central column, the two positioning columns and the central column respectively penetrate through the cover plate, and the number of the fixers is two, each fixer is respectively in threaded connection with the corresponding positioning column and is respectively sleeved on the outer surface wall of the corresponding fixing column.
According to the die pressing process and device for the steel lining polytetrafluoroethylene straight pipe, the steel pipe is placed above the base and located inside the positioning ring, the enclosing plate is placed above the steel pipe, PTFE is filled until the gap is filled, the cover plate is arranged above the enclosing plate, the other end of the steel pipe is covered, the enclosing plate and the cover plate are fixed through the fixing device, the positioning column is used for fixing the enclosing plate and the cover plate, the central column is arranged, in order to enable PTFE to form a tubular shape, the central column can be conveniently demoulded through the anti-sticking agent, PTFE adhesion is prevented, PTFE is polytetrafluoroethylene, and the die pressing process and device have the beneficial effects that the PTFE can be tightly attached to the inner surface wall of the steel pipe through filling PTFE first and then heating the steel pipe.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of the steps of example 1 of the present invention.
Fig. 2 is a flowchart of the steps of embodiment 2 of the present invention.
Fig. 3 is a flowchart of the steps of embodiment 3 of the present invention.
FIG. 4 is a schematic structural diagram of a molding device for a steel-lined PTFE straight pipe according to the present invention.
FIG. 5 is a top view of the apparatus for molding a straight steel-lined PTFE tube according to the present invention.
Fig. 6 is a cross-sectional view of the a-a line structure of fig. 5 of the present invention.
1-base, 2-positioning ring, 3-central column, 4-coaming plate, 5-cover plate, 6-positioning column and 7-fixer.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Embodiment 1, please refer to fig. 1, and the invention provides a die pressing process for a steel-lined polytetrafluoroethylene straight pipe, comprising the following steps:
s1: welding a straight pipe and a flange, and pretreating the straight pipe and the flange;
s2: derusting the steel pipe and the flange by a sand blasting machine to ensure that the derusting by sand blasting reaches grade Sa 2;
s3: cleaning impurities and oil stains inside and outside walls of the steel pipe and the flange to ensure that the steel pipe and the flange are free of foreign matters;
s4: putting one end of the straight pipe into a die pressing device, pouring a PTFE finished product to enable an inner liner layer to be tightly combined with a steel part, sealing the die pressing device, and heating the straight pipe to enable the PTFE to be tightly attached to the inner surface wall of the straight pipe;
s5: adjusting an infrared lamp panel to 440 ℃, so that the PTFE is melted and is tightly attached to the inner surface and the wall of the straight pipe;
s6: heating to 170 ℃ by adopting an electric furnace, preserving heat for 2 hours, and naturally cooling.
Wherein with the straight tube with the flange welding back, place the steel pipe the top of base 1, and be located the inside of holding ring 2, and then will otter board 4 is placed in the top of steel pipe to it is up to filling up the space to fill in PTFE, and then will apron 5 set up in the top of otter board 4 covers the other end of steel pipe, and then the rethread fixer 7 is right otter board 4 with apron 5 is fixed, reference column 6 is used for fixing otter board 4 with apron 5, the setting of center post 3, in order to make PTFE form the tubulose, carries out sand blasting to the steel pipe simultaneously, can make better laminating with the steel pipe of PTFE lamp plate, has increased the quality of steel lining polytetrafluoroethylene straight tube simultaneously, wherein the irradiation of infrared ray, it shines steady 440 ℃, can make the heating of steel pipe and PTFE more even, energy saving simultaneously rust cleaning straight tube, The heat efficiency is high, the stress of the steel lining polytetrafluoroethylene straight pipe can be eliminated through heat preservation of the electric furnace, the heat preservation temperature is 170 ℃, the time is 2 hours, and the quality and the performance of the steel lining polytetrafluoroethylene straight pipe can be improved.
Embodiment 2, please refer to fig. 2, which provides a die pressing process for a steel-lined polytetrafluoroethylene straight pipe, comprising the following steps:
s1: welding a straight pipe and a flange, and pretreating the straight pipe and the flange;
s2: derusting the steel pipe and the flange by a sand blasting machine to ensure that the derusting by sand blasting reaches grade Sa 2;
s3: cleaning impurities and oil stains inside and outside walls of the steel pipe and the flange to ensure that the steel pipe and the flange are free of foreign matters;
s4: putting one end of the straight pipe into a die pressing device, pouring a PTFE finished product to enable an inner liner layer to be tightly combined with a steel part, sealing the die pressing device, and heating the straight pipe to enable the PTFE to be tightly attached to the inner surface wall of the straight pipe;
s5: adjusting the infrared lamp panel to 460 ℃ to enable the PTFE to be melted and tightly attached to the inner surface and the wall of the straight pipe;
s6: heating to 190 ℃ by adopting an electric furnace, preserving heat for 4 hours, and naturally cooling.
Wherein with straight tube and flange welding back, place the steel pipe the top of base 1, and be located the inside of holding ring 2, and then will otter board 4 is placed in the top of steel pipe to it is up to filling up the space to fill in PTFE, and will again apron 5 set up in the top of otter board 4 covers the other end of steel pipe, and then the rethread fixer 7 is right otter board 4 with apron 5 is fixed, reference column 6 is used for fixing otter board 4 with apron 5, the setting of center post 3, in order to make PTFE form the tubulose, carries out sand blasting to the steel pipe simultaneously, can make better laminating with the steel pipe of PTFE lamp plate, has increased the quality of steel lining polytetrafluoroethylene straight tube simultaneously, wherein the irradiation of infrared ray, it shines steady 460 ℃, can make being heated of steel pipe and PTFE more even, simultaneously energy saving lamp plate energy rust cleaning, The heat efficiency is high, the stress of the steel lining polytetrafluoroethylene straight pipe can be eliminated through heat preservation of the electric furnace, the heat preservation temperature is 190 ℃ for 4 hours, and the quality and the performance of the steel lining polytetrafluoroethylene straight pipe can be improved.
s1: welding a straight pipe and a flange, and pretreating the straight pipe and the flange;
s2: derusting the steel pipe and the flange by a sand blasting machine to ensure that the derusting by sand blasting reaches grade Sa 2;
s3: cleaning impurities and oil stains inside and outside walls of the steel pipe and the flange to ensure that the steel pipe and the flange are free of foreign matters;
s4: putting one end of the straight pipe into a die pressing device, pouring a PTFE finished product to enable an inner liner layer to be tightly combined with a steel part, sealing the die pressing device, and heating the straight pipe to enable the PTFE to be tightly attached to the inner surface wall of the straight pipe;
s5: adjusting an infrared lamp panel to 450 ℃, so that the PTFE is melted and is tightly attached to the inner surface and the wall of the straight pipe;
s6: heating to 180 ℃ by adopting an electric furnace, preserving heat for 3 hours, and naturally cooling.
Wherein with the straight tube with the flange welding back, place the steel pipe the top of base 1, and be located the inside of holding ring 2, and then will otter board 4 is placed in the top of steel pipe to it is full up to fill the space to fill in PTFE, and then will apron 5 set up in the top of otter board 4 covers the other end of steel pipe, and then the rethread fixer 7 is right otter board 4 with apron 5 is fixed, reference column 6 is used for fixing otter board 4 with apron 5, the setting of center post 3, in order to make PTFE form the tubulose, carries out sand blasting to the steel pipe simultaneously, can make better laminating with the steel pipe of PTFE lamp plate, has increased the quality of steel lining polytetrafluoroethylene straight tube simultaneously, wherein the irradiation of infrared ray, it shines steady 450 ℃, can make being heated of steel pipe and PTFE more even, energy saving simultaneously rust cleaning straight tube, The heat efficiency is high, the stress of the steel lining polytetrafluoroethylene straight pipe can be eliminated through heat preservation of the electric furnace, the heat preservation temperature is 180 ℃, the time is 3 hours, and the quality and the performance of the steel lining polytetrafluoroethylene straight pipe can be improved.
Referring to fig. 4 to 6, the invention further provides a die pressing device for a steel-lined polytetrafluoroethylene straight pipe, which comprises a base 1, a positioning ring 2, a central column 3, a screen plate 4, a cover plate 5, positioning columns 6 and a fixer 7, wherein the positioning ring 2 is fixedly connected with the base 1 and is positioned above the base 1, the central column 3 is fixedly connected with the base 1 and is positioned above the base 1, the number of the positioning columns 6 is two, the two positioning columns 6 are respectively fixedly connected with the base 1 and are respectively positioned above the base 1, the screen plate 4 is slidably connected with the two positioning columns 6, the two positioning columns 6 respectively penetrate through the screen plate 4, the cover plate 5 is slidably connected with the two positioning columns 6 and the central column 3, the two positioning columns 6 and the central column 3 respectively penetrate through the cover plate 5, the number of the fixing devices 7 is two, and each fixing device 7 is respectively in threaded connection with the corresponding positioning column 6 and is respectively sleeved on the outer surface wall of the corresponding fixing column.
In the embodiment, a steel pipe is placed above the base 1 and positioned inside the positioning ring 2, the mesh plate 4 is placed above the steel pipe, PTFE is filled until a gap is filled, the cover plate 5 is arranged above the mesh plate 4, the other end of the steel pipe is covered, the mesh plate 4 and the cover plate 5 are fixed through the fixer 7, the positioning column 6 is used for fixing the mesh plate 4 and the cover plate 5, the central column 3 is arranged, in order to enable PTFE to form a tubular shape, the central column 3 can be conveniently demoulded through the anti-sticking agent, PTFE adhesion is prevented, and the PTFE is polytetrafluoroethylene.
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 as defined by the appended claims.
Claims (6)
1. The die pressing process of the steel lining polytetrafluoroethylene straight pipe is characterized by comprising the following steps of:
welding a straight pipe and a flange, and pretreating the straight pipe and the flange;
putting one end of the straight pipe into a die pressing device, pouring a PTFE finished product to enable an inner liner layer to be tightly combined with a steel part, sealing the die pressing device, and heating the straight pipe to enable the PTFE to be tightly attached to the inner surface wall of the straight pipe;
heating to 170-190 ℃ by adopting an electric furnace, preserving the heat for 2-4 hours, and naturally cooling.
2. A process for molding a straight steel-lined polytetrafluoroethylene tube according to claim 1,
before the step of pouring the finished PTFE product: and coating an anti-sticking agent inside the molding device.
3. A process for molding a straight steel-lined polytetrafluoroethylene tube according to claim 2,
the anti-sticking agent adopts any one of PVA aqueous solution, polystyrene solution, silicone rubber solution, emulsified silicone oil, stearic acid solution, paraffin solution and mineral oil.
4. A process for molding a straight steel-lined polytetrafluoroethylene tube according to claim 3,
heating to 170-190 ℃ by adopting an electric furnace, preserving heat for 2-4 hours, and naturally cooling: and carrying out water pressure test at 1.3-1.7 times of design pressure.
5. The die pressing process of the steel-lined polytetrafluoroethylene straight pipe according to claim 4,
after the water pressure test: and (4) carrying out integrity test, wherein the leakage point detection method adopts an electric spark test.
6. A die pressing device of a steel lining polytetrafluoroethylene straight pipe, which adopts the die pressing process of the steel lining polytetrafluoroethylene straight pipe as claimed in claim 5, and is characterized in that,
comprises a base, a positioning ring, a central column, a surrounding plate, a cover plate, a positioning column and a fixer, wherein the positioning ring is fixedly connected with the base, and is positioned above the base, the central column is fixedly connected with the base and is positioned above the base, the number of the positioning columns is two, the two positioning columns are respectively and fixedly connected with the base, and are respectively positioned above the base, the coaming is connected with the two positioning columns in a sliding way, the two positioning columns respectively penetrate through the coaming, the cover plate is connected with the two positioning columns and the central column in a sliding way, the two positioning columns and the central column respectively penetrate through the cover plate, the number of the fixing devices is two, and each fixing device is respectively in threaded connection with the corresponding positioning column and is respectively sleeved on the outer surface wall of the corresponding fixing column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111549524.2A CN114274440A (en) | 2021-12-17 | 2021-12-17 | Die pressing process and device for steel lining polytetrafluoroethylene straight pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111549524.2A CN114274440A (en) | 2021-12-17 | 2021-12-17 | Die pressing process and device for steel lining polytetrafluoroethylene straight pipe |
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| CN114274440A true CN114274440A (en) | 2022-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111549524.2A Pending CN114274440A (en) | 2021-12-17 | 2021-12-17 | Die pressing process and device for steel lining polytetrafluoroethylene straight pipe |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4368217A (en) * | 1980-06-06 | 1983-01-11 | Produits Chimiques Ugine Kuhlmann | Process for providing a polytetrafluoroethylene coating on the walls of a metal body |
| CN113715241A (en) * | 2021-08-20 | 2021-11-30 | 浙江菲达通球环保管业有限公司 | Manufacturing process of high-temperature-resistant negative-pressure steel-lined polytetrafluoroethylene composite pipe |
-
2021
- 2021-12-17 CN CN202111549524.2A patent/CN114274440A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4368217A (en) * | 1980-06-06 | 1983-01-11 | Produits Chimiques Ugine Kuhlmann | Process for providing a polytetrafluoroethylene coating on the walls of a metal body |
| CN113715241A (en) * | 2021-08-20 | 2021-11-30 | 浙江菲达通球环保管业有限公司 | Manufacturing process of high-temperature-resistant negative-pressure steel-lined polytetrafluoroethylene composite pipe |
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