CN111043410A - Steel lining tetrafluoro pipe and mould pressing process thereof - Google Patents
Steel lining tetrafluoro pipe and mould pressing process thereof Download PDFInfo
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- CN111043410A CN111043410A CN201911355881.8A CN201911355881A CN111043410A CN 111043410 A CN111043410 A CN 111043410A CN 201911355881 A CN201911355881 A CN 201911355881A CN 111043410 A CN111043410 A CN 111043410A
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- pipe
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- positioning
- steel pipe
- tetrafluoride
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
- F16L9/147—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups comprising only layers of metal and plastics with or without reinforcement
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D23/00—Producing tubular articles
- B29D23/001—Pipes; Pipe joints
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The invention provides a steel lining tetrafluoride pipe and a mould pressing process thereof, comprising a steel pipe and a mould core arranged in the steel pipe, wherein the tetrafluoride pipe is filled between the mould core and the steel pipe; cover plates are arranged at two ends of the tetrafluoro pipe and fixedly connected with flanges of the steel pipe through bolts; a plurality of reinforcing ribs are arranged on the inner side wall of the steel pipe, and a pressure-sensitive adhesive layer is filled between the tetrafluoro pipe and the steel pipe; when in compression molding, the outer side wall of the tetrafluoride pipe can form a groove meshed with the reinforcing rib, and meanwhile, the tetrafluoride pipe can be bonded with the inner side wall of the steel pipe through a pressure-sensitive adhesive layer, so that the compounding capability between the tetrafluoride pipe and the steel pipe is effectively enhanced; the tetrafluoride pipe comprises a main pipe and positioning pipes arranged at two ends of the main pipe, and when powder is poured in a die pressing manner, the formed positioning pipes can be used for positioning the die core, and then when the powder is poured in part of the main pipe and the die pressing manner is carried out, the uniform wall thickness of two sides can be ensured; in the process of pressure forming, the filled PTFE powder can be extruded and formed into a whole with the positioning pipes at two ends, thereby ensuring the product quality.
Description
Technical Field
The invention relates to the field of pipe processing, in particular to a steel lining tetrafluoro pipe and a die pressing process thereof.
Background
The steel-lined polytetrafluoroethylene tube (steel-lined tetrafluoride tube for short) is made of thermoplastic Polytetrafluoroethylene (PTFE) plastic with excellent chemical stability and is lined with common carbon steel tube as base body through specific technological process. It has the mechanical performance of steel pipe and the characteristics of high corrosion resistance, high temperature resistance and difficult growth of microbe of PTFE plastic, and is an ideal pipeline for conveying strong acid, strong alkali, industrial salt, strongly corrosive gas and other media.
The flange location that current steel lining tetrafluoro pipe adopted when carrying out the mould pressing and irritate the powder can lead to mold core and steel pipe hole decentraction, makes the clearance between the two uneven, and the phenomenon of wall thickness deviation or even disconnected powder easily appears in the polytetrafluoroethylene backing layer behind the mould pressing irritates the powder, influences product quality. When negative pressure appears in the pipe, the inner lining tetrafluoride pipe is easy to separate from the inner wall of the steel pipe, and even is sunken and deformed inwards.
Disclosure of Invention
Aiming at the technical problem, the invention provides a steel lining tetrafluoride pipe and a mould pressing process thereof.
A steel lining tetrafluoride pipe comprises a steel pipe and a mold core, wherein flanges are arranged at two ends of the steel pipe; the mold core and the steel pipe are coaxially arranged, and a gap between the mold core and the steel pipe is filled with a tetrafluoride pipe; cover plates are arranged at two ends of the tetrafluoride pipe and fixedly connected with the flanges through bolts; a plurality of reinforcing ribs are uniformly distributed on the inner side wall of the steel pipe along the circumferential direction of the steel pipe, and the length direction of each reinforcing rib is consistent with that of the steel pipe; the outer side wall of the tetrafluoride pipe is provided with a groove matched with the reinforcing rib, and a pressure-sensitive adhesive layer is filled between the tetrafluoride pipe and the steel pipe;
the tetrafluoride pipe comprises a main pipe and positioning pipes arranged at two ends of the main pipe, and each positioning pipe comprises a vertical part and a horizontal flanging; the vertical part extends into the steel pipe and is connected with the main pipe, and the horizontal flanging extends out of the steel pipe and is in lap joint with the flange of the steel pipe.
Preferably, the thickness of the pressure-sensitive adhesive layer is 2 to 3 mm.
Preferably, the length of the vertical part of the positioning tube is 25-30 mm.
Preferably, the length of the reinforcing rib is greater than that of the main pipe; the outer side walls of the main pipe and the vertical part of the positioning pipe are provided with grooves matched with the reinforcing ribs.
Preferably, the flange is provided with a positioning groove matched with the horizontal flanging, and the height of the positioning groove is smaller than that of the horizontal flanging.
Preferably, a pressing ring is sleeved on the periphery of the horizontal flanging, and the pressing ring is fixed between the flange and the cover plate through the bolt.
The die pressing process of the steel lining tetrafluoride pipe is characterized by mainly comprising the following steps:
1) uniformly coating a pressure-sensitive adhesive layer on the inner side wall of the steel pipe, and naturally airing the pressure-sensitive adhesive layer;
2) selecting a proper mould, and pressing PTFE powder into a positioning pipe by using a press;
3) inserting a positioning pipe into one end of the steel pipe, sequentially installing a pressing ring and a cover plate outside the positioning pipe, and fixing the positioning pipe by using the pressing ring and the cover plate;
4) placing the mold core into the steel pipe, and inserting one end of the mold core into the positioning pipe for positioning;
5) after the mold core is positioned, filling PTFE powder in a gap between the mold core and the steel pipe;
6) the other end of the steel pipe is sequentially provided with a positioning pipe, a pressing ring and a cover plate, so that the PTFE powder is tightly pressed and sealed between the two positioning pipes;
7) and (3) conveying the workpiece sealed in the step 6) into an isostatic pressing bin for pressure forming, and extruding and forming the PTFE powder filled in the workpiece and the positioning pipes at two ends into a whole.
Preferably, in the step 1), the thickness of the pressure-sensitive adhesive layer is controlled to be 2-3 mm.
Preferably, in the step 2), the length of the vertical part of the positioning tube is controlled to be 25-30 mm.
The invention has the beneficial effects that: 1. the two ends of the main pipe of the tetrafluoride pipe are provided with the positioning pipes, the core can be positioned by utilizing the formed positioning pipes during powder injection during mould pressing, the coaxiality of the core and the steel pipe is ensured, and the uniform wall thickness of the two sides can be ensured during powder injection mould pressing of the main pipe part; meanwhile, in the process of pressure forming, the filled PTFE powder can be extruded and formed into a whole with the positioning pipes at the two ends, so that the product quality is ensured; 2. be provided with a plurality of strengthening rib on the inside wall of steel pipe, it has pressure sensitive adhesive layer to fill between tetrafluoro pipe and steel pipe, and during compression molding, the outside wall of tetrafluoro pipe can form the recess with the strengthening rib interlock, and the outside wall of tetrafluoro pipe can bond through the inside wall of pressure sensitive adhesive layer with the steel pipe simultaneously, has effectively strengthened the compound ability between tetrafluoro pipe and the steel pipe, prevents that the tetrafluoro pipe is sunken to warp when the negative pressure.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic overall structure diagram of an embodiment of the present invention;
FIG. 2 is a top view of a steel pipe in an embodiment of the present invention;
the figures in the drawings represent:
1. steel pipe 2, mold core 3, pressure sensitive adhesive layer 4, flange 5, reinforcing rib 6 and cover plate
7. Bolt 8, main pipe 9, registration arm 10, constant head tank 11, clamping ring.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "left", "right", "upper", "lower", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1 and 2, the steel-lined tetrafluoride pipe comprises a steel pipe 1 and a mold core 2 arranged in the steel pipe 1. The mold core 2 and the steel pipe 1 are coaxially arranged, and a tetrafluoro pipe is filled in a gap between the mold core 2 and the steel pipe 1. A pressure sensitive adhesive layer 3 (such as organic silicon, polyurethane and the like) is filled between the tetrafluoride pipe and the steel pipe 1, and the thickness of the pressure sensitive adhesive layer 3 is 2-3 mm. Flanges 4 are arranged at two ends of the steel pipe 1, a plurality of reinforcing ribs 5 are uniformly distributed on the inner side wall of the steel pipe 1 along the circumferential direction of the steel pipe, and the length direction of each reinforcing rib 5 is consistent with that of the steel pipe 1. Cover plates 6 are arranged at two ends of the tetrafluoride pipe, and the cover plates 6 are fixedly connected with the flange 4 through bolts 7.
The tetrafluoride pipe comprises a main pipe 8 and positioning pipes 9 arranged at two ends of the main pipe 8. The positioning pipe 9 comprises a vertical part and a horizontal flanging, wherein the horizontal flanging extends to the outside of the steel pipe 1 and is in lap joint with the flange 4, and the vertical part extends to the inside of the steel pipe 1 and is connected with the main pipe 8. The length of the vertical part is 25-30mm, and grooves matched with the reinforcing ribs 5 are formed in the vertical part and the outer side wall of the main pipe 8. The length of the reinforcing rib 5 is larger than that of the main pipe 8, so that the reinforcing rib 5 can be simultaneously meshed and fixed with the main pipe 8 and the positioning pipes 9 at the two ends of the main pipe 8.
The flange 4 is provided with a positioning groove 10 matched with the horizontal flanging of the positioning pipe 9 (the height of the positioning groove 10 is less than that of the horizontal flanging), and when the positioning pipe 9 is installed, the positioning groove 10 can position the positioning pipe. The periphery of the horizontal flanging is sleeved with a pressing ring 11, and the pressing ring 11 is fixed between the flange 4 and the cover plate 6 through a bolt 7.
The die pressing process of the steel lining tetrafluoride pipe provided by the embodiment mainly comprises the following steps:
1) uniformly coating a pressure-sensitive adhesive layer 3 on the inner side wall of the steel pipe 1, and naturally airing the pressure-sensitive adhesive layer 3, wherein the thickness of the pressure-sensitive adhesive layer 3 is controlled to be 2-3 mm;
2) selecting a proper mould, pressing PTFE powder into the positioning tube 9 by using a press, and controlling the length of the vertical part of the positioning tube 9 to be 25-30 mm;
3) inserting a positioning pipe 9 into the lower end of the steel pipe 1, sequentially installing a pressing ring 11 and a cover plate 6 outside the positioning pipe 9, and fixing the positioning pipe 9 by using the pressing ring 11 and the cover plate 6;
4) vertically placing the mold core 2 into the steel pipe 1, and inserting the lower end of the mold core 2 into the positioning pipe 9 for positioning;
5) after the mold core 2 is positioned, filling PTFE powder in a gap between the mold core 2 and the steel pipe 1;
6) the upper end of the steel pipe 1 is sequentially provided with a positioning pipe 9, a pressing ring 11 and a cover plate 6, so that PTFE powder is tightly pressed and sealed between the two positioning pipes 9;
7) and (3) conveying the workpiece sealed in the step 6) into an isostatic pressing bin for pressure forming, and extruding and forming the PTFE powder filled in the workpiece and the positioning pipes 9 at two ends into a whole.
In this embodiment, before powder is irritated in the mould pressing, earlier utilize fashioned registration arm 9 to fix a position mold core 2, after guaranteeing mold core 2 and steel pipe 1's axiality, again to being responsible for 8 parts and irritate powder mould presses, can effectively guarantee that the wall thickness of tetrafluoro pipe both sides is even. In the process of pressure forming, the filled PTFE powder can be extruded and formed into a whole with the positioning pipes 9 at the two ends, thereby ensuring the product quality. Simultaneously, during pressure forming, the outer lateral wall of tetrafluoro pipe can form the recess with 5 interlocks of strengthening rib, and the lateral wall of tetrafluoro pipe can also bond through pressure sensitive adhesive layer 3 and steel pipe 1's inside wall, has effectively strengthened the compound ability between tetrafluoro pipe and the steel pipe 1, prevents that the tetrafluoro pipe from sinking and warping when the negative pressure.
Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention.
Claims (9)
1. A steel lining tetrafluoride pipe comprises a steel pipe and a mold core, wherein flanges are arranged at two ends of the steel pipe; the mold core and the steel pipe are coaxially arranged, and a gap between the mold core and the steel pipe is filled with a tetrafluoride pipe; the both ends of tetrafluoro pipe are equipped with the apron, the apron pass through the bolt with flange fixed connection, its characterized in that: a plurality of reinforcing ribs are uniformly distributed on the inner side wall of the steel pipe along the circumferential direction of the steel pipe, and the length direction of each reinforcing rib is consistent with that of the steel pipe; the outer side wall of the tetrafluoride pipe is provided with a groove matched with the reinforcing rib, and a pressure-sensitive adhesive layer is filled between the tetrafluoride pipe and the steel pipe;
the tetrafluoride pipe comprises a main pipe and positioning pipes arranged at two ends of the main pipe, and each positioning pipe comprises a vertical part and a horizontal flanging; the vertical part extends into the steel pipe and is connected with the main pipe, and the horizontal flanging extends out of the steel pipe and is in lap joint with the flange of the steel pipe.
2. The steel lined tetrafluoride pipe according to claim 1, wherein: the thickness of the pressure-sensitive adhesive layer is 2-3 mm.
3. The steel lined tetrafluoride pipe according to claim 1, wherein: the length of the vertical part of the positioning pipe is 25-30 mm.
4. A steel lined tetrafluoride pipe according to claim 3 wherein: the length of the reinforcing rib is greater than that of the main pipe; the outer side walls of the main pipe and the vertical part of the positioning pipe are provided with grooves matched with the reinforcing ribs.
5. The steel lined tetrafluoride pipe according to claim 1, wherein: and the flange is provided with a positioning groove matched with the horizontal flanging, and the height of the positioning groove is smaller than that of the horizontal flanging.
6. The steel lined tetrafluoride pipe according to claim 5, wherein: and a pressing ring is sleeved on the periphery of the horizontal flanging, and the pressing ring is fixed between the flange and the cover plate through the bolt.
7. The die pressing process of the steel-lined tetrafluoride pipe according to any of claims 1 to 6, which essentially comprises the following steps:
1) uniformly coating a pressure-sensitive adhesive layer on the inner side wall of the steel pipe, and naturally airing the pressure-sensitive adhesive layer;
2) selecting a proper mould, and pressing PTFE powder into a positioning pipe by using a press;
3) inserting a positioning pipe into one end of the steel pipe, sequentially installing a pressing ring and a cover plate outside the positioning pipe, and fixing the positioning pipe by using the pressing ring and the cover plate;
4) placing the mold core into the steel pipe, and inserting one end of the mold core into the positioning pipe for positioning;
5) after the mold core is positioned, filling PTFE powder in a gap between the mold core and the steel pipe;
6) the other end of the steel pipe is sequentially provided with a positioning pipe, a pressing ring and a cover plate, so that the PTFE powder is tightly pressed and sealed between the two positioning pipes;
7) and (3) conveying the workpiece sealed in the step 6) into an isostatic pressing bin for pressure forming, and extruding and forming the PTFE powder filled in the workpiece and the positioning pipes at two ends into a whole.
8. The die pressing process of the steel lined tetrafluoride tube according to claim 7, wherein: in the step 1), the thickness of the pressure-sensitive adhesive layer is controlled to be 2-3 mm.
9. The die pressing process of the steel lined tetrafluoride tube according to claim 7, wherein: in the step 2), the length of the vertical part of the positioning pipe is controlled to be 25-30 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911355881.8A CN111043410A (en) | 2019-12-25 | 2019-12-25 | Steel lining tetrafluoro pipe and mould pressing process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911355881.8A CN111043410A (en) | 2019-12-25 | 2019-12-25 | Steel lining tetrafluoro pipe and mould pressing process thereof |
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| Publication Number | Publication Date |
|---|---|
| CN111043410A true CN111043410A (en) | 2020-04-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911355881.8A Pending CN111043410A (en) | 2019-12-25 | 2019-12-25 | Steel lining tetrafluoro pipe and mould pressing process thereof |
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| Country | Link |
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| CN (1) | CN111043410A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115194932A (en) * | 2022-08-08 | 2022-10-18 | 浙江菲达通球环保管业有限公司 | Steel lining silicon carbide structure and lining manufacturing method thereof |
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| DE102009000188A1 (en) * | 2009-01-13 | 2010-07-22 | Maincor Ag | Multi-layer composite pipe comprises internal layer produced from a first polymer, an external layer produced from a second polymer, and an intermediate layer produced from a metal and arranged between the internal and external layer |
| CN203863897U (en) * | 2014-05-06 | 2014-10-08 | 浙江菲达通球环保管业有限公司 | Positioning device for improving mould pressing concentricity of steel lined polytetrafluoroethylene pipe and pipe fittings |
| CN204164523U (en) * | 2014-09-23 | 2015-02-18 | 南通雪松四氟防腐设备有限公司 | A kind of Novel steel-lined polytetrafluoroethylthree pipe |
| CN207093954U (en) * | 2017-06-23 | 2018-03-13 | 江苏金鹰特种管业有限公司 | A kind of steel-plastics composite pipe for high intensity of preventing fires |
| CN208687137U (en) * | 2018-07-09 | 2019-04-02 | 南京氟源化工管道设备有限公司 | A kind of steel lining polytetrafluoroethylene (PTFE) straight tube |
| CN110500450A (en) * | 2019-08-21 | 2019-11-26 | 南京三禾防腐设备有限公司 | The Fluorine-lined processing technology of high temperature resistant negative pressure resistant |
-
2019
- 2019-12-25 CN CN201911355881.8A patent/CN111043410A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009000188A1 (en) * | 2009-01-13 | 2010-07-22 | Maincor Ag | Multi-layer composite pipe comprises internal layer produced from a first polymer, an external layer produced from a second polymer, and an intermediate layer produced from a metal and arranged between the internal and external layer |
| CN203863897U (en) * | 2014-05-06 | 2014-10-08 | 浙江菲达通球环保管业有限公司 | Positioning device for improving mould pressing concentricity of steel lined polytetrafluoroethylene pipe and pipe fittings |
| CN204164523U (en) * | 2014-09-23 | 2015-02-18 | 南通雪松四氟防腐设备有限公司 | A kind of Novel steel-lined polytetrafluoroethylthree pipe |
| CN207093954U (en) * | 2017-06-23 | 2018-03-13 | 江苏金鹰特种管业有限公司 | A kind of steel-plastics composite pipe for high intensity of preventing fires |
| CN208687137U (en) * | 2018-07-09 | 2019-04-02 | 南京氟源化工管道设备有限公司 | A kind of steel lining polytetrafluoroethylene (PTFE) straight tube |
| CN110500450A (en) * | 2019-08-21 | 2019-11-26 | 南京三禾防腐设备有限公司 | The Fluorine-lined processing technology of high temperature resistant negative pressure resistant |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115194932A (en) * | 2022-08-08 | 2022-10-18 | 浙江菲达通球环保管业有限公司 | Steel lining silicon carbide structure and lining manufacturing method thereof |
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Application publication date: 20200421 |
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| RJ01 | Rejection of invention patent application after publication |