Method and device for preparing polytetrafluoroethylene powder lining of pipeline

Abstract

The invention discloses a method and a device for preparing a polytetrafluoroethylene powder lining of a pipeline. The method comprises the following steps: putting a core rod (1) into a leather sheath (2); the leather sheath (2) is plugged into the pipeline (3); the flange blind plate (4) is mounted at the closed end of the pipeline (3), and one end of the leather sheath (2) is pressed and sealed at the closed end through the flange blind plate (4); a powder filling gap (5) is formed between the outer wall of the leather sheath (2) and the inner wall of the pipeline (3), the leather sheath (2) at the water injection end of the pipeline (3) is lifted up, and polytetrafluoroethylene powder (7) is stuffed into the powder filling gap (5); the polytetrafluoroethylene powder has the advantages of high flatness and high curing speed after being fixed on the inner wall of the pipeline.

Description

Technical Field

[0001] The invention relates to the field of pipeline production, and in particular to a method and a device for preparing a polyfluoroethylene powder lining of a pipeline. Background Art

[0002] At present, PTFE powder (polytetrafluoroethylene) is often used for pipe lining because of its strong plasticity and the ability to be shaped on the inner wall of the pipe after extrusion and baking. On the PTFE pipe lining production line, the PTFE powder needs to be fixed on the inner wall of the pipe, but there is a lack of a production method and device specifically for pressing and fixing the PTFE powder on the inner wall of the calcium carbonate pipe. Summary of the invention

[0003] The purpose of the present invention is to provide a method and device for preparing a pipeline polytetrafluoroethylene powder lining in view of the above-mentioned shortcomings.

[0004] The steps of the present invention are as follows: A1. Put the mandrel into the leather case; A2. Insert the leather sleeve into the pipe; A3. The blind flange is installed at the closed end of the pipeline, and one end of the leather sleeve is pressed and sealed at the closed end through the blind flange; A4. A powder filling gap is formed between the outer wall of the leather sleeve and the inner wall of the pipe. Lift the leather sleeve at the water injection end of the pipe and insert PTFE powder into the powder filling gap. A5. The flange is installed at the water injection end of the pipeline, and the other end of the leather sleeve is pressed and sealed through the flange; A6. Install the pipe on the water injection test bench; A7. Pour water into the mandrel with a water pressure of 0.5-1MPa. Maintain the pressure for 5-10 minutes. Water flows into the leather case through the water holes on the outer wall of the mandrel. The leather case is stretched open by water pressure, and the PTFE powder is tightly attached to the inner wall of the pipe. A8. Release the pressure and drain the water in the holster; A9. Remove the pipe from the water injection test bench; A10. Heat the pipe in an industrial oven at a temperature of 350-400°C. A11. Take the pipe out of the industrial oven and remove the blind flange and flange. A12. Take the leather sleeve out of the pipe and the PTFE powder will solidify on the inner wall of the pipe.

[0005] B1. Before installing the blind flange, place the annular gasket on the closed end of the pipe. Before installing the flange, place the annular gasket on the water injection end of the pipe.

[0006] B2. Pour hot water into the core rod. The hot water temperature is 80-100°C. The water and steam will stretch the leather cover and make it expand.

[0007] B3. When filling the powder, keep pressing down the top surface of the PTFE powder to make the PTFE powder fill the entire powder filling gap.

[0008] B4. The blind flange is installed at the closed end of the pipeline by bolts, and the flange is installed at the water injection end of the pipeline by bolts.

[0009] Including water injection test bench, mandrel, leather sleeve, flange blind plate, flange and industrial oven, An assembly workbench is provided on one side of the shell of the water injection test bench, and the pipeline is placed on the assembly workbench. A plurality of water holes are opened on the outer wall of the core rod, and the core rod is installed in the leather sleeve, and the leather sleeve is installed in the pipeline. The flange blind plate 4 is installed at the closed end of the pipeline, and one end of the leather sleeve is clamped and fixed. A powder filling gap is formed between the outer wall of the leather sleeve and the inner wall of the pipeline, and polytetrafluoroethylene powder is stuffed into the powder filling gap. The flange is installed at the water injection end of the pipeline, and the other end of the leather sleeve is clamped and fixed. The water injection test bench is used to inject water into the core rod, and the industrial oven is located on one side of the water injection test bench.

[0010] An annular gasket is arranged between the blind flange and the closed end of the pipeline, and an annular gasket is arranged between the flange and the water injection end of the pipeline.

[0011] The annular gasket is composed of a pair of arc-shaped sheets, and a group of bolt passing holes are evenly distributed in the annular gasket.

[0012] The inner ring of the annular gasket is a PTFE powder filled area.

[0013] The two ends of the leather sleeve are expanded outwards to form a sealing disk, and a group of bolt passing grooves are evenly distributed in an annular shape on the sealing disk.

[0014] The invention has the advantages that after the tetrafluoroethylene powder is fixed on the inner wall of the pipeline, the flatness is high and the curing speed is fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a calcium carbonate lining preparation device of the present invention.

[0016] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention when filling with tetrafluoroethylene powder.

[0017] Figure 3 It is a schematic diagram of the cross-sectional structure after the powder filling of the present invention is completed.

[0018] Figure 4 It is a schematic diagram of the explosion structure of the calcium carbonate lining preparation device of the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0022] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the invention is usually placed when in use. This is only for the convenience of describing the present invention and simplifying the description, and does 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 therefore cannot be understood as a limitation on the present invention. In addition, if the terms "first", "second", etc. appear in the description of the present invention, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0023] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] As shown in the accompanying drawings, the steps of the present invention are as follows: A1, put the mandrel 1 into the leather case 2; A2, insert the leather case 2 into the pipe 3; A3, the blind flange plate 4 is installed at the closed end of the pipe 3, and one end of the leather sleeve 2 is pressed and sealed at the closed end through the blind flange plate 4; A4. A powder filling gap 5 is formed between the outer wall of the leather sleeve 2 and the inner wall of the pipe 3. The leather sleeve 2 at the water injection end of the pipe 3 is lifted and polytetrafluoroethylene powder 7 is stuffed into the powder filling gap 5. A5, flange 6 is installed at the water injection end of pipe 3, and the other end of leather sleeve 2 is pressed and sealed through flange 6; A6. Install the pipe 3 on the water injection test bench 8; A7. Pour water into the core rod 1 at a pressure of 0.5-1 MPa. Maintain the pressure for 5-10 minutes. Water flows into the leather case 2 through the water holes on the outer wall of the core rod 1. The leather case 2 is opened by the water pressure, and the PTFE powder 6 is tightly attached to the inner wall of the pipe 3. A8, release the pressure and discharge the water in the leather case 2; A9, the pipe 3 is removed from the water injection test bench 8; A10, put the pipe 3 into the industrial oven 12 for heating, the heating temperature is 350-400°C; A11. Take the pipe 3 out of the industrial oven 12 and remove the blind flange plate 4 and the flange 6; A12. Take the leather cover 2 out of the pipe 3. The PTFE powder 7 is solidified on the inner wall of the pipe 3.

[0025] B1. Before installing the blind flange plate 4, place the annular gasket 9 on the closed end of the pipe 3. Before installing the flange plate 6, place the annular gasket 9 on the water injection end of the pipe 3.

[0026] B2. Pour hot water into the core rod 1, the temperature of the hot water is 80-100°C, and the leather cover 2 is stretched open by water and water vapor, so that the leather cover 2 expands.

[0027] B3. When filling the powder, continuously press down the top surface of the PTFE powder 7 so that the PTFE powder 7 fills the entire powder filling gap 5.

[0028] B4. The blind flange plate 4 is installed on the closed end of the pipeline 3 by bolts, and the flange plate 6 is installed on the water injection end of the pipeline 3 by bolts.

[0029] It includes a water injection test bench 8, a core rod 1, a leather sleeve 2, a flange blind plate 4, a flange 6 and an industrial oven 12. An assembly workbench 10 is provided on one side of the shell of the water injection inspection table 8, and the pipeline 3 is placed on the assembly workbench 10. A plurality of water holes are opened on the outer wall of the core rod 1. The core rod 1 is installed in the leather case 2, and the leather case 2 is installed in the pipeline 3. The flange blind plate 4 is installed at the closed end of the pipeline 3, and one end of the leather case 2 is clamped and fixed. A powder filling gap 5 is formed between the outer wall of the leather case 2 and the inner wall of the pipeline 3. Teflon powder 7 is stuffed into the powder filling gap 5. The flange plate 6 is installed at the water injection end of the pipeline 3, and the other end of the leather case 2 is clamped and fixed. The water injection inspection table 8 is used to inject water into the core rod 1, and the industrial oven 12 is located on one side of the water injection inspection table 8.

[0030] An annular gasket 9 is arranged between the blind flange 4 and the closed end of the pipeline 3 , and an annular gasket 9 is arranged between the flange plate 6 and the water injection end of the pipeline 3 .

[0031] The annular gasket 9 is composed of a pair of arc-shaped sheets, and the annular gasket 9 is evenly distributed with a group of bolt through holes.

[0032] The inner ring of the annular gasket 9 is a region filled with polytetrafluoroethylene powder.

[0033] The two ends of the leather sleeve 2 are expanded outwards to form a sealing disk, and a group of bolt passing grooves 11 are evenly distributed in an annular shape on the sealing disk.

[0034] Embodiment 1: The mandrel 1 is placed in the leather sleeve 2, the leather sleeve 2 is inserted into the pipe 3, the flange blind plate 4 is installed at the closed end of the pipe 3 by bolts, one end of the leather sleeve 2 is pressed and sealed at the closed end by the flange blind plate 4, a powder filling gap 5 is formed between the outer wall of the leather sleeve 2 and the inner wall of the pipe 3, the leather sleeve 2 at the water injection end of the pipe 3 is lifted, and polytetrafluoroethylene powder 7 is inserted into the powder filling gap 5, the flange 6 is installed at the water injection end of the pipe 3 by bolts, the other end of the leather sleeve 2 is pressed and sealed by the flange 6, the pipe 3 is installed on the water injection detection table 8, and a pair of The calipers press the water injection end flange of the pipe 3, the water injection head goes deep into the water injection end of the pipe 3, and water is poured into the core rod 1. The water flows into the leather cover 2 through the water hole on the outer wall of the core rod 1, and the leather cover 2 is stretched open by water pressure. The polytetrafluoroethylene powder 6 fits tightly with the inner wall of the pipe 3 and is shaped. The water injection detection table 8 sucks out the water in the leather cover 2, and the pipe 3 is removed from the water injection detection table 8. The pipe 3 is placed in the industrial oven 12 for heating, and taken out after heating is completed. The flange blind plate 4 and the flange plate 6 are removed, the leather cover 2 is taken out from the pipe 3, and the polytetrafluoroethylene powder 7 is inserted and attached to the inner wall of the pipe 3.

[0035] Embodiment 2: The mandrel 1 is placed in the leather sleeve 2, the leather sleeve 2 is inserted into the pipe 3, the annular gasket 9 is placed at the closed end of the pipe 3, the flange blind plate 4 is covered on the annular gasket 9, and is installed at the closed end of the pipe 3 by bolts, one end of the leather sleeve 2 is pressed and sealed at the closed end by the annular gasket 9, the annular gasket 9 is placed at the water injection end of the pipe 3 for preliminary fixation, a powder filling gap 5 is formed between the outer wall of the leather sleeve 2 and the inner wall of the pipe 3, the leather sleeve 2 at the water injection end of the pipe 3 is lifted, and polytetrafluoroethylene powder 7 is inserted into the powder filling gap 5, and the polytetrafluoroethylene powder 6 fills the inner ring of the annular gasket 9, the flange 6 is installed at the water injection end of the pipe 3 by bolts, and the other end of the leather sleeve 2 is fixed by the annular gasket 9. The end is pressed and sealed, and the pipe 3 is installed on the water injection detection platform 8. The water injection end flange of the pipe 3 is pressed by a pair of calipers on the water injection detection platform 8. The water injection head goes deep into the water injection end of the pipe 3, and water is poured into the core rod 1. The water flows into the leather cover 2 through the water hole on the outer wall of the core rod 1, and the leather cover 2 is stretched open by water pressure. The polytetrafluoroethylene powder 6 fits tightly with the inner wall of the pipe 3 and is shaped. The water injection detection platform 8 sucks out the water in the leather cover 2, and the pipe 3 is removed from the water injection detection platform 8. The pipe 3 is placed in the industrial oven 12 for heating. After heating, it is taken out, the flange blind plate 4 and the flange plate 6 are removed, the leather cover 2 is taken out from the pipe 3, and the polytetrafluoroethylene powder 7 is inserted and attached to the inner wall of the pipe 3.

[0036] Embodiment 3: Pour hot water into the core rod 1, so that the polytetrafluoroethylene powder 6 can be closely attached to the inner wall of the pipe 3 and the shape can be more firmly formed, and it is not easy to deform during the process of transferring to the industrial oven 12 after pumping out water.

Claims

1. A method for preparing a pipeline PTFE powder lining, characterized in that: Here are the steps: A1. Place the mandrel (1) into the leather case (2); A2, insert the leather case (2) into the pipe (3); A3, a blind flange plate (4) is installed at the closed end of the pipeline (3), and one end of the leather sleeve (2) is pressed and sealed at the closed end through the blind flange plate (4); A4, a powder filling gap (5) is formed between the outer wall of the leather sleeve (2) and the inner wall of the pipe (3), the leather sleeve (2) at the water injection end of the pipe (3) is lifted, and polytetrafluoroethylene powder (7) is inserted into the powder filling gap (5); A5, a flange (6) is installed at the water injection end of the pipe (3), and the other end of the leather sleeve (2) is pressed and sealed by the flange (6); A6. Install the pipeline (3) on the water injection test bench (8); A7, water is poured into the core rod (1) at a pressure of 0.5 to 1 MPa. After the water is poured, the pressure is maintained for 5 to 10 minutes. The water flows into the leather sleeve (2) through the water holes on the outer wall of the core rod (1). The leather sleeve (2) is opened by the water pressure, and the polytetrafluoroethylene powder (6) is tightly attached to the inner wall of the pipe (3); A8, release the pressure and drain the water in the leather case (2); A9, the pipe (3) is removed from the water injection test bench (8); A10, placing the pipe (3) in an industrial oven (12) for heating at a temperature of 350-400°C; A11. Take the pipeline (3) out of the industrial oven (12), and remove the blind flange plate (4) and the flange plate (6); A12. Take the leather sleeve (2) out of the pipe (3), and the polytetrafluoroethylene powder (7) is solidified on the inner wall of the pipe (3).

2. The method for preparing a pipeline polytetrafluoroethylene powder lining according to claim 1, characterized in that: B1. Before installing the blind flange (4), place the annular gasket (9) on the closed end of the pipe (3); before installing the flange (6), place the annular gasket (9) on the water injection end of the pipe (3).

3. The method for preparing a pipeline polytetrafluoroethylene powder lining according to claim 1, characterized in that: B2. Pour hot water into the core rod (1), the temperature of the hot water being 80-100°C, and the leather cover (2) is stretched open by the water and water vapor, so that the leather cover (2) expands.

4. The method for preparing a pipeline polytetrafluoroethylene powder lining according to claim 1, characterized in that: B3. When filling the powder, the top surface of the polytetrafluoroethylene powder (7) is continuously pressed down to make the polytetrafluoroethylene powder (7) fill the entire powder filling gap (5).

5. The method for preparing a pipeline PTFE powder lining according to claim 1, characterized in that: B4. The blind flange (4) is installed at the closed end of the pipeline (3) by bolts, and the flange (6) is installed at the water injection end of the pipeline (3) by bolts.

6. A device for preparing PTFE powder lining for pipelines, characterized in that It comprises a water injection test bench (8), a core rod (1), a leather cover (2), a flange blind plate (4), a flange plate (6) and an industrial oven (12). An assembly workbench (10) is provided on one side of the shell of the water injection test bench (8). The pipeline (3) is placed on the assembly workbench (10). A plurality of water holes are opened on the outer wall of the core rod (1). The core rod (1) is installed in the leather sleeve (2). The leather sleeve (2) is installed in the pipeline (3). The flange blind plate (4) is installed at the closed end of the pipeline (3). One end of the leather sleeve (2) is clamped and fixed. A powder filling gap (5) is formed between the outer wall of the leather sleeve (2) and the inner wall of the pipeline (3). Teflon powder (7) is inserted into the powder filling gap (5). The flange plate (6) is installed at the water injection end of the pipeline (3). The other end of the leather sleeve (2) is clamped and fixed. The water injection test bench (8) is used to inject water into the core rod (1). The industrial oven (12) is located on one side of the water injection test bench (8).

7. The device for preparing PTFE powder lining for pipelines according to claim 6 is characterized in that: An annular gasket (9) is arranged between the blind flange plate (4) and the closed end of the pipeline (3), and an annular gasket (9) is arranged between the flange plate (6) and the water injection end of the pipeline (3).

8. The device for preparing PTFE powder lining for pipelines according to claim 7 is characterized in that: The annular gasket (9) is composed of a pair of arc-shaped sheets, and a group of bolt passing holes are evenly distributed in an annular shape on the annular gasket (9).

9. A device for preparing PTFE powder lining for pipelines according to claim 8, characterized in that: The inner ring of the annular gasket (9) is a region filled with polytetrafluoroethylene powder.

10. A device for preparing PTFE powder lining for pipelines according to claim 9, characterized in that: The two ends of the leather sleeve (2) are spread outward to form a sealing disk, and a group of bolt passing grooves (11) are evenly distributed in an annular shape on the sealing disk.

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