PO-lined anti-corrosion pipeline and production process thereof

Abstract

The invention discloses a PO-lined anti-corrosion pipeline and a production process thereof, and relates to the technical field of PO-lined anti-corrosion pipelines. The PO-lined anti-corrosion pipeline comprises a steel pipe body, and a first supporting groove is formed in the inner circle wall face of the steel pipe body; the first connecting groove and the first connecting groove are formed in one side of the interior of the first supporting groove and used for strengthening connection between the PO pipeline and the first supporting groove, and the first connecting groove, the second connecting groove, the third connecting groove, the corresponding first supporting groove, the corresponding second supporting groove and the corresponding third supporting groove can be ground in the inner wall of the steel pipe body through the arranged numerical control internal grinding bed; by arranging the steel pipe heating equipment, the first supporting groove section, the second supporting groove section, the third supporting groove section and the unpolished section on the steel pipe body can be heated in a partitioned mode through the steel pipe heating equipment, then the PO pipeline and the steel pipe are compounded, and in the compounding process, the PO pipeline gradually enters the steel pipe body, and the temperature continuously rises; and the molten PO pipeline is prevented from blocking movement of the PO pipeline in the steel pipe body.

Description

Technical Field

[0001] The invention relates to the technical field of PO lined anti-corrosion pipelines, in particular to a PO lined anti-corrosion pipeline and a production process thereof. Background Art

[0002] PO lined anti-corrosion pipeline It forms a composite structure by lining polyolefin materials into the steel pipe to improve the corrosion resistance, wear resistance, permeability resistance and high temperature resistance of the pipeline. This technology is particularly suitable for the repair and anti-corrosion treatment of high-temperature oil and gas pipelines. It has good physical and chemical properties, especially outstanding wear resistance; low thermal conductivity, with thermal insulation effect; smooth inner surface, small friction resistance coefficient, which helps to prevent scaling; good impact resistance and flexibility, can withstand high water hammer pressure without damage. During the construction process, the steel pipe lining PO technology can utilize the characteristics of the inner lining pipe automatically recovering its original shape after deformation. Through special equipment construction, after the lining pipe is pulled into the target pipeline, the lining pipe returns to its original diameter, and the thickness of the lining pipe can be designed according to needs. In addition, the physical and mechanical properties of the PO lined steel pipe are manifested in tensile yield strength, elongation at break, longitudinal shrinkage, etc., and it shows good performance in hydrostatic test and hydrostatic thermal stability test.

[0003] After searching, it was found that there were problems in the process of producing lined PO anti-corrosion pipes through a composite process in the prior art. In the process of producing lined PO anti-corrosion pipes, the staff generally first grinds and cleans the inner wall of the steel pipe, and then heats the steel pipe, and then puts the PO pipe into the heated steel pipe. In this process, when the staff puts the PO pipe into the heated steel pipe, the front end of the PO pipe needs to pass through the entire steel pipe, and the steel pipe itself has a high temperature after heating, which causes the front end of the PO pipe to melt when moving in the inner wall of the steel pipe. The front end of the PO pipe melts in the steel pipe, causing the PO pipe to adhere to the inner wall of the steel pipe, generating resistance, so that the remaining part of the PO pipe is difficult to completely enter the steel pipe, affecting production. At the same time, the inner wall of the steel pipe is relatively smooth. After the PO pipe is composited with the steel pipe, the inner wall of the steel pipe is difficult to support the PO pipe, so that the lined PO anti-corrosion pipe may be separated from the inner wall of the steel pipe during subsequent use, and the tightness of the connection between the two is poor, and there are problems with the production process. Therefore, based on the above search and in combination with the prior art, a PO lined anti-corrosion pipeline and a production process thereof are proposed to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a PO lined anti-corrosion pipe and a production process thereof, which has the advantages of strong stability, tight connection, low defective rate, high production efficiency, etc., so as to solve the problem proposed in the above background technology that the front end of the PO pipe melts quickly in the steel pipe, causing the PO pipe to adhere to the inner wall of the steel pipe, generating resistance, so that the remaining part of the PO pipe is difficult to completely enter the steel pipe and the PO pipe may be separated from the inner wall of the steel pipe.

[0005] To achieve the above object, the present invention provides the following technical solutions: As one of the technical solutions of the present invention, a PO lined anti-corrosion pipeline is provided, including a steel pipe body, the inner circular wall surface of the steel pipe body is provided with a support groove 1; a connecting groove 1, the connecting groove 1 is provided on the inner side of the supporting groove 1, and is used to strengthen the connection between the PO pipe and the supporting groove 1, and the inner circular wall surface of the supporting groove 1 is provided with a support groove 2; a connecting groove 2, the connecting groove 2 is provided on the inner side of the supporting groove 2, and is used to strengthen the connection between the PO pipe and the supporting groove 2, and the inner circular wall surface of the supporting groove 2 is provided with a support groove 3; a connecting groove 3, the connecting groove 3 is provided on the inner side of the supporting groove 3, and is used to strengthen the connection between the PO pipe and the supporting groove 3, and two flanges, both of which are fixedly sleeved on the outer circular wall surface of the steel pipe body, and are used to connect the steel pipe body with an external pipe; the cooperation of the supporting groove 1, the supporting groove 2 and the supporting groove 3 makes the inner wall of the steel pipe body step-shaped and the inner diameter decreases.

[0006] As a second technical solution of the present invention, there is provided a production equipment for PO lined anti-corrosion pipes, comprising a base plate, wherein the base plate is arranged below the steel pipe body, a CNC internal grinding machine is installed on the top surface of the base plate, and the CNC internal grinding machine is used to grind the support groove one, the support groove two and the support groove three on the inner wall of the steel pipe body, a steel pipe heating device is installed on the top surface of the base plate, and the steel pipe heating device is used to perform zoned heating on the steel pipe body, and two baffles are fixedly installed on the top surface of the base plate, and a plurality of electric rollers for conveying the steel pipe body are rotatably connected between the two baffles.

[0007] Furthermore, a support plate is slidably connected to the top surface of the steel pipe body, a feed hole for allowing the PO pipe to enter is opened on one side of the support plate, two electric push rods three are fixedly installed on one side of the support plate, a clamping plate for clamping the pipe is fixedly installed on one telescopic end of the electric push rods three, two slide rails for supporting the sliding of the support plate are fixedly installed on the top surface of the steel pipe body, and two sliders are fixedly installed on the bottom surface of the support plate, and the sliders are slidably connected to the slide rails.

[0008] Furthermore, a screw rod is threadedly connected to one side of the support plate, a driving motor for driving the screw rod to rotate is installed on the top surface of the steel pipe body, and one end of the driving shaft of the driving motor is fixedly connected to one end of the screw rod.

[0009] Furthermore, a support frame is fixedly installed on the top surface of the two baffles, a mounting plate is fixedly installed on one side of the inner part of the support frame, one side of the mounting plate is rotatably connected to two support arms, one side of the support arm is rotatably connected to a roller one, the bottom surface of the support arm is rotatably connected to a positioning wheel two, a trapezoidal plate is slidably connected to one side of the mounting plate, an electric push rod one for driving the trapezoidal plate to move is installed on the top surface of the support frame, two support seats are fixedly installed on the bottom surface of the trapezoidal plate, and a positioning wheel one is rotatably connected between the two support seats.

[0010] Furthermore, a mounting frame is fixedly installed on the top surface of the two baffles, a pressure plate for limiting the steel pipe body is arranged inside the mounting frame, and two electric push rods for driving the pressure plate to move are installed on the top surface of the mounting frame, and one end of the telescopic axis of the two electric push rods passes through the mounting frame and is fixedly connected to the top surface of the pressure plate.

[0011] Furthermore, two fixed blocks are fixedly installed on one side of the support plate, and a support rod for limiting the two clamps is fixedly installed between the two fixed blocks. The clamps are slidably connected to the support rod, and the clamps move inward along the support rod. The support rod can limit the movement of the clamps.

[0012] Furthermore, a base for supporting the steel pipe body is fixedly installed on the top surface of the substrate, two connecting frames are fixedly installed on the top surface of the substrate, a test plate for pressure testing the steel pipe body is arranged inside the connecting frame, and a hydraulic cylinder is fixedly installed on the top surface of the connecting frame, and the telescopic shaft of the hydraulic cylinder passes through the connecting frame and is fixedly connected to the top surface of the test plate.

[0013] As a third technical solution of the present invention, a production process for PO lined anti-corrosion pipeline is provided, comprising the following steps: S1: By placing the steel pipe body on the workbench of the CNC internal circular grinding machine, the grinding wheel on the CNC internal circular grinding machine can grind the inner wall of the steel pipe body, so that the inner side of the steel pipe body forms the supporting groove 2, the supporting groove 3 and the connecting groove 1, and at the same time, the inner side of the supporting groove 2 forms the connecting groove 1, the inner side of the supporting groove 3 forms the connecting groove 2, and the inner wall of the supporting groove 3 forms the connecting groove 3; S2: After grinding, the steel pipe body will be heated by the steel pipe heating equipment. The steel pipe heating equipment will heat the steel pipe body in four sections, so that the temperature of the steel pipe body increases from left to right. S3: One end of the PO pipe can be clamped by the cooperation of the electric push rod 3 and the clamping plate. At the same time, the telescopic shaft of the electric push rod 1 drives the trapezoidal plate to move downward. The downward movement of the trapezoidal plate causes the support arm to rotate inward until the positioning wheel 2 on the support arm abuts against the outer wall of the steel pipe body. At this time, the positioning wheel 1 and the two positioning wheels 2 can guide the movement of the PO pipe. S4: The PO pipe is driven to move forward into the heated steel pipe body by the movement of the support plate. The PO pipe is partially melted under the heat of the steel pipe body and adheres to the inner wall of the steel pipe body. The partially melted PO pipe enters the support groove 3, the connecting groove 2 and the connecting groove 3, so that the steel pipe body and the PO pipe are tightly compounded. S5: The composite steel pipe body is cooled and formed, and a hydraulic cylinder is used to drive a test plate to extrude the composite steel pipe body, so that a pressure test can be performed on the composite steel pipe body.

[0014] Compared with the prior art, the present invention has the following beneficial effects: Through the CNC internal grinding machine, the CNC internal grinding machine can grind out connection groove 1, connection groove 2, connection groove 3 and corresponding support groove 1, support groove 2 and support groove 3 on the inner wall of the steel pipe body, and the inner diameters of support groove 3, support groove 2 and support groove 1 gradually become smaller, so that the inner wall of the steel pipe body is stepped. Through the steel pipe heating equipment, the steel pipe heating equipment can heat the support groove 1, support groove 2, support groove 3 and unpolished section on the steel pipe body in different areas, and then compound the PO pipe and the steel pipe. During the compounding process, the PO pipe gradually enters the steel pipe body. The temperature in the body also continues to rise, preventing the melted PO pipe from blocking the movement of the PO pipe inside the steel pipe body; the partially melted PO pipe will enter the connecting groove 1 inside the supporting groove 1, the connecting groove 2 inside the supporting groove 2, and the connecting groove 3 inside the connecting groove 1, thereby reinforcing the connection between the PO pipe and the steel pipe body. The stepped cross-section of the inner wall of the steel pipe body can also support the PO pipe to prevent the PO pipe from detaching from the steel pipe body, further improving the tightness between the PO pipe and the steel pipe body, and helping the staff to composite the PO pipe with the steel pipe body.

[0015] Through the provided clamping plates, the two clamping plates can clamp one end of the PO pipe, and through the cooperation of the provided electric push rod 1, trapezoidal plate, limiting block, mounting plate, support arm, roller 1, positioning wheel 2, positioning wheel 1, limiting hole and limiting block, the PO pipe can be moved forward so that the positioning wheel 1 and the two positioning wheels 2 can roll, and the positioning wheel 1 and the positioning wheel 2 can guide the movement of the PO pipe to prevent the PO pipe from shaking after entering the interior of the steel pipe body, thereby improving the accuracy of the composite of the PO pipe and the steel pipe body. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a schematic diagram of the three-dimensional structure of the present invention.

[0017] Figure 2 It is a schematic diagram of the support arm structure of the present invention.

[0018] Figure 3 It is a schematic diagram of the mounting plate structure of the present invention.

[0019] Figure 4 It is a schematic diagram of the fixed block structure of the present invention.

[0020] Figure 5 It is a schematic diagram of the steel pipe body structure of the present invention.

[0021] Figure 6 It is a schematic cross-sectional view of the steel pipe body structure of the present invention.

[0022] Figure 7 for Figure 6 Schematic diagram of the local structure of A.

[0023] In the figure: 1. Steel pipe body; 2. Base plate; 3. CNC internal grinding machine; 4. Baffle; 5. Electric roller; 6. Steel pipe heating equipment; 7. Support frame; 8. Slider; 9. Support plate; 10. Drive motor; 11. Screw; 12. Mounting plate; 13. Trapezoidal plate; 14. Electric push rod 1; 15. Support arm; 16. Support shaft; 17. Roller 1; 18. Positioning wheel 1; 19. Support seat; 20. Positioning wheel 2; 21. Mounting frame; 2 2. Pressing plate; 23. Electric push rod 2; 24. Limiting hole; 25. Limiting block; 26. Base; 27. Connecting frame; 28. Test plate; 29. ​​Hydraulic cylinder; 30. Electric push rod 3; 31. Clamp; 32. Fixing block; 33. Support rod; 34. Feeding hole; 35. Flange; 36. Support slot 1; 37. Support slot 2; 38. Support slot 3; 39. Connecting slot 1; 40. Connecting slot 2; 41. Connecting slot 3; 42. Slide rail. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0025] In a typical implementation of this application, please refer to Figure 1 to Figure 7A PO lined anti-corrosion pipeline comprises a steel pipe body 1, a support groove 1 36 is provided on the inner circumferential wall surface of the steel pipe body 1, a connecting groove 1 39 is provided on the inner side of the support groove 1 36, and is used to strengthen the connection between the PO pipe and the support groove 1 36, a support groove 2 37 is provided on the inner circumferential wall surface of the support groove 1 36, a connecting groove 2 40 is provided on the inner side of the support groove 2 37, and is used to strengthen the connection between the PO pipe and the support groove 2 37, a support groove 38 is provided on the inner circumferential wall surface of the support groove 2 37, a connecting groove 3 41 is provided on the inner side of the support groove 3 38, and is used to strengthen the connection between the PO pipe and the support groove 3 38, two flanges 35 are fixedly sleeved on the outer circumferential wall surface of the steel pipe body 1, and are used to connect the steel pipe body 1 with an external pipe, and the cooperation between the support groove 2 37 and the support groove 3 38 makes the inner wall of the steel pipe body 1 step-shaped and the inner diameter decreases gradually; As a preferred implementation in this embodiment, please refer to Figure 1 to Figure 7 A production device for a PO lined anti-corrosion pipeline, comprising a base plate 2, the base plate 2 is arranged below a steel pipe body 1, a CNC internal grinding machine 3 is installed on the top surface of the base plate 2, the CNC internal grinding machine 3 is used to grind a support groove 1 36, a support groove 2 37 and a support groove 3 38 on the inner wall of the steel pipe body 1, and the corresponding connection groove 1 39, the connection groove 2 40 and the connection groove 3 41 are also formed by grinding through the CNC internal grinding machine 3; The CNC internal circular grinding machine 3 includes a bed mechanism, a headstock mechanism, a tailstock mechanism, a workbench mechanism, a grinding wheel frame mechanism, a saddle mechanism, a feeding mechanism, a grinding fluid system, an electrical control system and a CNC system; Among them, cleaning the inside of the steel pipe body 1 is also an important process, which helps to make a tight connection between the PO pipeline and the steel pipe body 1; A steel pipe heating device 6 is installed on the top surface of the substrate 2. The steel pipe heating device 6 is used to heat the steel pipe body 1 in different areas so that the temperatures of different parts of the steel pipe body 1 are different, so as to facilitate the subsequent compounding of the heated steel pipe with the PO pipe. The steel pipe heating device 6 is specifically an induction heating device, including an induction heating electric furnace, a conveying roller, a feeding system, a temperature closed-loop system and other components, which can heat the steel pipe in different zones, so that the temperature of each part of the steel pipe is different. The support groove 1 36, the support groove 2 37 and the support groove 3 38 and the unpolished part of the steel pipe body 1 form a total of four sections, and the temperature of the steel pipe body 1 increases continuously from left to right; Two baffles 4 are fixedly installed on the top surface of the base plate 2, and a plurality of electric rollers 5 for conveying the steel pipe body 1 are rotatably connected between the two baffles 4. The heated steel pipe will fall on the plurality of electric rollers 5, and the plurality of electric rollers 5 will convey the steel pipe forward; With the above technical features, the staff places the steel pipe body 1 on the workbench on the top surface of the substrate 2 through the CNC internal grinding machine 3, and grinds the inner wall of the steel pipe body 1 with the grinding wheel on the CNC internal grinding machine 3. The grinding wheel on the CNC internal grinding machine 3 first grinds a support groove 1 36 on the inner wall of the steel pipe body 1 and grinds a connecting groove 1 39 on the inner side of the connecting groove 1 39, then grinds a support groove 2 37 on the inner wall of the support groove 2 37 and grinds a connecting groove 2 40 on the inner side of the support groove 2 37, and finally grinds a support groove 3 38 on the inner wall of the support groove 2 37 and grinds a connecting groove 3 41 on the inner side of the support groove 3 38. Since the inner diameters of the support groove 3 38, the support groove 2 37 and the support groove 1 36 gradually decrease, the inner wall of the steel pipe body 1 is stepped; At the same time, the interior of the steel pipe body 1 can be divided into four sections according to the support groove 1 36, the support groove 2 37, the support groove 3 38 and the unpolished part, namely the support groove 1 36 section, the support groove 2 37 section, the support groove 3 38 section and the unpolished section; The staff puts the steel pipe body 1 into the steel pipe heating device 6 for zone heating. The temperature gradually increases from left to right on the steel pipe body 1. After the support groove 1 36, the support groove 2 37 and the support groove 3 38 are polished on the inner wall of the steel pipe body 1, the inner diameter of the steel pipe body 1 also gradually increases from left to right. The staff puts the PO pipe into the steel pipe body 1 so that the PO pipe is inserted from the left side of the steel pipe body 1. The temperature on the support groove 3 38 section is relatively low, so that the PO pipe does not melt immediately when entering the support groove 3 38 section, so as to prevent the PO pipe from melting immediately when entering the steel pipe body 1 due to the high temperature of the PO pipe, and to prevent the melted PO pipe from blocking the movement of the PO pipe inside the steel pipe body 1; Among them, the corresponding relationship table between the thickness of the steel pipe body 1 and the required heating temperature is shown in Appendix 1: It can be seen from the above table that the heating temperature of the steel pipe body 1 gradually increases with the increase of thickness; the first section of the PO pipe entering the steel pipe body 1 does not melt due to the relatively low temperature, but continuously melts and adheres to the inner wall of the steel pipe body 1 during the continuous penetration process, and the data therein can also support this process; As the PO pipe goes deeper into the steel pipe body 1, the PO pipe will gradually melt due to the rising temperature inside the steel pipe body 1. The melted PO pipe will enter the connection groove 1 39 inside the support groove 1 36, the connection groove 2 40 inside the support groove 2 37, and the connection groove 3 41 inside the connection groove 1 39, thereby reinforcing the connection between the PO pipe and the steel pipe body 1. The stepped cross section of the inner wall of the steel pipe body 1 can also support the PO pipe to prevent the PO pipe from detaching from the steel pipe body 1, further improving the tightness between the PO pipe and the steel pipe body 1. It helps the staff to composite the PO pipe with the steel pipe body 1. The PO pipe improves the anti-corrosion performance of the steel pipe body 1, thereby completing the production of the lined PO anti-corrosion pipe, making it convenient for the staff to use the lined PO steel pipe to transport corrosive media.

[0026] As a preferred implementation in this embodiment, please refer to Figure 1 to Figure 7 The top surface of the steel pipe body 1 is slidably connected with a support plate 9, and a feed hole 34 for the PO pipe to enter is opened on one side of the support plate 9. Two electric push rods 30 are fixedly installed on one side of the support plate 9. A clamping plate 31 for clamping the pipe is fixedly installed on one telescopic end of the electric push rod 30. The PO pipe produced by the injection molding machine will enter the inside of the feed hole 34 on the support plate 9. The telescopic shaft of the electric push rod 30 drives the clamping plate 31 to move until it abuts against both sides of the pipe, thereby clamping one end of the PO pipe. Two slide rails 42 for supporting the sliding of the support plate 9 are fixedly installed on the top surface of the steel pipe body 1. Two sliders 8 are fixedly installed on the bottom surface of the support plate 9. The slider 8 is slidably connected with the slide rail 42. The slide rail 42 and the slider 8 can limit the movement of the support plate 9, thereby achieving a limiting effect on the support plate 9; Specifically, through the support plate 9, the pipe produced by the pipe injection molding machine moves to the right side of the support plate 9 through the feed hole 34 on the support plate 9. The staff starts the electric push rod 30, and the telescopic shaft of the electric push rod 30 moves inward to drive the clamping plate 31 to move inward. The two clamping plates 31 move inward until they abut against the outer wall of the PO pipe, thereby clamping one end of the PO pipe. At the same time, the support plate 9 moves forward and also drives the slider 8 to move forward along the slide rail 42. The slider 8 and the slide rail 42 can limit the movement of the support plate 9. The support plate 9 moves forward and also drives the PO pipe to move forward, thereby compounding the PO pipe with the steel pipe body 1. A screw rod 11 is threadedly connected to one side of the support plate 9, and a driving motor 10 for driving the screw rod 11 to rotate is installed on the top surface of the steel pipe body 1. One end of the driving shaft of the driving motor 10 is fixedly connected to one end of the screw rod 11. The rotation of the driving shaft of the driving motor 10 drives the screw rod 11 to rotate. The rotation of the screw rod 11 enables the support plate 9 to drive the PO pipeline thereon to move forward. A bearing seat is fixedly installed on the top surface of the steel pipe body 1. One end of the screw rod 11 is rotatably connected to the inner circular wall surface of the bearing seat, and the bearing seat can support one end of the screw rod 11; Specifically, the driving motor 10 is provided, and the driving rotation of the driving motor 10 drives the screw rod 11 to rotate, and the rotation of the screw rod 11 causes the support plate 9 and the PO pipe thereon to move forward, thereby allowing the PO pipe to move forward; The top surfaces of the two baffles 4 are fixedly mounted with a support frame 7, a mounting plate 12 is fixedly mounted on one side of the support frame 7, one side of the mounting plate 12 is rotatably connected to two support arms 15, one side of the mounting plate 12 is fixedly mounted with two support shafts 16, the support arms 15 rotate with the support shafts 16, and the support arms 15 rotate around the support shafts 16; A roller 17 is rotatably connected to one side of the support arm 15 through a rotating shaft, a positioning wheel 20 is rotatably connected to the bottom surface of the support arm 15 through a rotating shaft, a trapezoidal plate 13 is slidably connected to one side of the mounting plate 12, an electric push rod 14 for driving the trapezoidal plate 13 to move is installed on the top surface of the support frame 7, one end of the telescopic shaft of the electric push rod 14 passes through the support frame 7 and is fixedly connected to the top surface of the trapezoidal plate 13, two support seats 19 are fixedly installed on the bottom surface of the trapezoidal plate 13, and a positioning wheel 18 is rotatably connected between the two support seats 19 through a rotating shaft; When the support plate 9 drives the PO pipe to move forward, the telescopic shaft of the electric push rod 14 starts to drive the trapezoidal plate 13 to move downward. The downward movement of the trapezoidal plate 13 causes the two support arms 15 to rotate inward around the support shaft 16 until the positioning wheel 20 on the support arm 15 abuts against the inner wall of the PO pipe. At the same time, the positioning wheel 18 contacts the top surface of the PO pipe. At this time, the positioning wheel 18 and the two positioning wheels 20 can guide the movement of the PO pipe to prevent it from tilting, and ensure that the PO pipe vertically enters the heated steel pipe. The radius of the PO pipe is slightly larger than the inner diameter of the steel pipe, which helps the two to be tightly combined. A limiting hole 24 for sliding the trapezoidal plate 13 is opened on one side of the mounting plate 12, and a limiting block 25 is fixedly installed on one side of the trapezoidal plate 13. The limiting block 25 is slidably connected to the limiting hole 24; Specifically, after the two clamps 31 clamp one end of the PO pipe, the staff starts the electric push rod 14, and the telescopic shaft of the electric push rod 14 moves downward to drive the trapezoidal plate 13 to move downward. The trapezoidal plate 13 moves downward to drive the limiting block 25 to move inside the limiting hole 24 on the mounting plate 12. The limiting hole 24 and the limiting block 25 cooperate to limit the movement of the trapezoidal plate 13. The downward movement of the trapezoidal plate 13 also causes the roller 17 on the support arm 15 to roll along the inclined surface of the trapezoidal plate 13, while causing the support arm 15 to move around Rotate inwards around the support shaft 16, the two support arms 15 rotate inwards so that the positioning wheel 2 20 on the support arm 15 abuts against the outer wall of the PO pipe. At this time, the positioning wheel 18 between the two support seats 19 on the bottom surface of the trapezoidal plate 13 abuts against the outer wall of the PO pipe. The support plate 9 drives the PO pipe to move forward so that the positioning wheel 18 and the two positioning wheels 20 roll. The positioning wheel 18 and the positioning wheel 2 20 can guide the movement of the PO pipe to prevent the PO pipe from shaking after entering the interior of the steel pipe body 1, thereby improving the accuracy of the composite of the PO pipe and the steel pipe body 1; The top surfaces of the two baffles 4 are fixedly mounted with a mounting frame 21, and a pressing plate 22 for limiting the position of the steel pipe body 1 is arranged inside the mounting frame 21. An electric push rod 23 for driving the pressing plate 22 to move is installed on the top surface of the mounting frame 21. The telescopic shaft of the pressing plate 22 moves downward to drive the pressing plate 22 to move downward until the pressing plate 22 abuts against the outer wall of the steel pipe body 1, thereby limiting the position of the steel pipe body 1. One end of the telescopic shaft of the electric push rod 23 passes through the mounting frame 21 and is fixedly connected to the top surface of the pressing plate 22. Specifically, through the steel pipe heating device 6, the steel pipe body 1 after the internal zone heating of the steel pipe heating device 6 will move to multiple electric rollers 5, and the staff will start the electric push rod 23, and the telescopic shaft of the electric push rod 23 will move downward to drive the pressing plate 22 to move downward until the pressing plate 22 abuts against the outer wall of the PO pipe, thereby limiting the steel pipe body 1 to prevent the steel pipe body 1 from shifting when compounding with the PO pipe; Two fixing blocks 32 are fixedly installed on one side of the support plate 9, and a support rod 33 for limiting the two clamping plates 31 is fixedly installed between the two fixing blocks 32. The clamping plates 31 are slidably connected with the support rod 33. When the clamping plates 31 move inward, they will move inward along the support rod 33. The support rod 33 can limit the movement of the clamping plates 31. Specifically, by setting the clamping plate 31, the inward movement of the clamping plate 31 will drive the support rod 33 to move inward, and the support rod 33 can limit the movement of the clamping plate 31, thereby achieving a limiting effect on the clamping plate 31; A base 26 for supporting the steel pipe body 1 is fixedly installed on the top surface of the base plate 2, two connecting frames 27 are fixedly installed on the top surface of the base plate 2, a test plate 28 for pressure testing the steel pipe body 1 is arranged inside the connecting frame 27, a hydraulic cylinder 29 is fixedly installed on the top surface of the connecting frame 27, and the telescopic shaft of the hydraulic cylinder 29 passes through the connecting frame 27 and is fixedly connected to the top surface of the test plate 28; Specifically, through the set steel pipe body 1, the staff places the steel pipe body 1 after being composited with the PO pipe on two bases 26, and the staff starts the hydraulic cylinder 29, and the telescopic shaft of the hydraulic cylinder 29 moves downward to drive the test plate 28 to move downward to squeeze the steel pipe body 1, thereby performing a pressure test on the composite steel pipe body 1; The test data is shown in Appendix 2: From this, we can see that compared with the composite process in the prior art, the pressure-bearing performance of the PO-lined anti-corrosion pipe produced by this process is relatively excellent, which meets the pressure-bearing requirements during use, and also proves the rationality of the production process in this technical solution; Working principle: by placing the steel pipe body 1 on the workbench of the CNC internal grinding machine 3, the grinding wheel on the CNC internal grinding machine 3 can grind the inner wall of the steel pipe body 1, so that the inner side of the steel pipe body 1 forms a supporting groove 2 37, a supporting groove 3 38 and a connecting groove 1 39, and at the same time, the inner side of the supporting groove 2 37 forms a connecting groove 1 39, the inner side of the supporting groove 3 38 forms a connecting groove 2 40, and the inner wall of the supporting groove 3 38 forms a connecting groove 3 41; Then, the steel pipe body 1 after grinding is heated by the steel pipe heating device 6. The steel pipe heating device 6 heats the steel pipe body 1 in different zones according to the four sections on the steel pipe body 1, so that the temperature on the steel pipe body 1 increases from left to right. Secondly, one end of the PO pipe can be clamped by the cooperation of the electric push rod 3 30 and the clamping plate 31. At the same time, the telescopic shaft of the electric push rod 14 drives the trapezoidal plate 13 to move downward. The downward movement of the trapezoidal plate 13 causes the support arm 15 to rotate inward until the positioning wheel 20 on the support arm 15 abuts against the outer wall of the steel pipe body 1. At this time, the positioning wheel 18 and the two positioning wheels 20 can guide the movement of the PO pipe. Next, the support plate 9 moves to drive the PO pipe to move forward and enter the heated steel pipe body 1. The PO pipe will partially melt under the heat of the steel pipe body 1 and adhere to the inner wall of the steel pipe body 1. The partially melted PO pipe will enter the support groove 38, the connecting groove 2 40 and the connecting groove 3 41, so that the steel pipe body 1 and the PO pipe are tightly compounded. Finally, by cooling and shaping the composite steel pipe body 1 , the composite steel pipe body 1 can be pressure tested by driving the test plate 28 with the hydraulic cylinder 29 to extrude the composite steel pipe body 1 .

[0027] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A PO lined anti-corrosion pipeline, characterized in that: include: A steel pipe body (1), wherein the inner circumferential wall surface of the steel pipe body (1) is provided with a supporting groove (36); A connecting groove (39), the connecting groove (39) being provided on one side of the inner part of the supporting groove (36) and used for strengthening the connection between the PO pipe and the supporting groove (36), and a supporting groove (37) being provided on the inner circular wall surface of the supporting groove (36); A second connecting groove (40), the second connecting groove (40) being provided on one side of the interior of the second supporting groove (37) and used to strengthen the connection between the PO pipe and the second supporting groove (37), and a third supporting groove (38) being provided on the inner circular wall surface of the second supporting groove (37); A connection groove three (41), the connection groove three (41) is opened on one side of the inner part of the support groove three (38), and is used to strengthen the connection between the PO pipe and the support groove three (38); Two flanges (35), both of which are fixedly sleeved on the outer circular wall surface of the steel pipe body (1) and are used to connect the steel pipe body (1) to an external pipeline; The support groove 1 (36), the support groove 2 (37) and the support groove 3 (38) cooperate to make the inner wall of the steel pipe body (1) present a stepped shape and the inner diameter present a decreasing trend.

2. A production equipment for PO lined anti-corrosion pipes, used for the PO lined anti-corrosion pipes according to claim 1, characterized in that: include: A base plate (2), the base plate (2) being arranged below the steel pipe body (1), a CNC internal grinding machine (3) being installed on the top surface of the base plate (2), the CNC internal grinding machine (3) being used to grind the support groove 1 (36), the support groove 2 (37) and the support groove 3 (38) on the inner wall of the steel pipe body (1), a steel pipe heating device (6) being installed on the top surface of the base plate (2), the steel pipe heating device (6) being used to perform zone heating on the steel pipe body (1), two baffles (4) being fixedly installed on the top surface of the base plate (2), a plurality of electric rollers (5) for conveying the steel pipe body (1) being rotatably connected between the two baffles (4).

3. The production equipment for PO lined anticorrosive pipes according to claim 2, characterized in that: The top surface of the steel pipe body (1) is slidably connected to a support plate (9), one side of the support plate (9) is provided with a feed hole (34) for allowing the PO pipeline to enter, one side of the support plate (9) is fixedly mounted with two electric push rods (30), one end of the electric push rods (30) being retracted is fixedly mounted with a clamping plate (31) for clamping the pipeline, the top surface of the steel pipe body (1) is fixedly mounted with two slide rails (42) for supporting the support plate (9) to slide, and the bottom surface of the support plate (9) is fixedly mounted with two sliders (8), the sliders (8) being slidably connected to the slide rails (42).

4. The production equipment for PO lined anticorrosive pipes according to claim 3, characterized in that: A screw rod (11) is threadedly connected to one side of the support plate (9), and a driving motor (10) for driving the screw rod (11) to rotate is installed on the top surface of the steel pipe body (1), and one end of the driving shaft of the driving motor (10) is fixedly connected to one end of the screw rod (11).

5. The production equipment for PO lined anticorrosive pipes according to claim 4, characterized in that: A support frame (7) is fixedly mounted on the top surface of the two baffles (4); a mounting plate (12) is fixedly mounted on one side of the support frame (7); one side of the mounting plate (12) is rotatably connected to two support arms (15); one side of the support arm (15) is rotatably connected to a roller one (17); the bottom surface of the support arm (15) is rotatably connected to a positioning wheel two (20); one side of the mounting plate (12) is slidably connected to a trapezoidal plate (13); an electric push rod one (14) for driving the trapezoidal plate (13) to move is mounted on the top surface of the support frame (7); two support seats (19) are fixedly mounted on the bottom surface of the trapezoidal plate (13); a positioning wheel one (18) is rotatably connected between the two support seats (19).

6. The production equipment for PO lined anticorrosive pipes according to claim 5, characterized in that: A mounting frame (21) is fixedly mounted on the top surfaces of the two baffles (4), a pressure plate (22) for limiting the position of the steel pipe body (1) is arranged inside the mounting frame (21), and a second electric push rod (23) for driving the pressure plate (22) to move is mounted on the top surface of the mounting frame (21), and one end of the telescopic shaft of the second electric push rod (23) passes through the mounting frame (21) and is fixedly connected to the top surface of the pressure plate (22).

7. The production equipment for PO lined anticorrosive pipes according to claim 6, characterized in that: Two fixed blocks (32) are fixedly mounted on one side of the support plate (9); a support rod (33) for limiting the position of the two clamping plates (31) is fixedly mounted between the two fixed blocks (32); the clamping plates (31) are slidably connected to the support rod (33); when the clamping plates (31) move inwards, they move inwards along the support rod (33); and the support rod (33) can limit the movement of the clamping plates (31).

8. The production equipment for PO lined anticorrosive pipes according to claim 7, characterized in that: A base (26) for supporting the steel pipe body (1) is fixedly mounted on the top surface of the base plate (2), two connecting frames (27) are fixedly mounted on the top surface of the base plate (2), a test plate (28) for performing a pressure test on the steel pipe body (1) is arranged inside the connecting frame (27), a hydraulic cylinder (29) is fixedly mounted on the top surface of the connecting frame (27), a telescopic shaft of the hydraulic cylinder (29) passes through the connecting frame (27) and is fixedly connected to the top surface of the test plate (28).

9. A production process for PO lined anti-corrosion pipes, used for the production equipment for PO lined anti-corrosion pipes according to any one of claims 2 to 8, characterized in that: The following steps are involved: S1: The steel pipe body (1) is placed on a workbench of a numerically controlled internal grinding machine (3), and the grinding wheel on the numerically controlled internal grinding machine (3) can grind the inner wall of the steel pipe body (1), so that a second support groove (37), a third support groove (38) and a first connection groove (39) are formed inside the steel pipe body (1), and at the same time, a first connection groove (39) is formed on the inner side of the second support groove (37), a second connection groove (40) is formed on the inner side of the third support groove (38), and a third connection groove (41) is formed on the inner wall of the third support groove (38); S2: After being polished, the steel pipe body (1) is heated by a steel pipe heating device (6). The steel pipe heating device (6) heats the steel pipe body (1) in sections according to the four sections on the steel pipe body (1), so that the temperature on the steel pipe body (1) increases from left to right; S3: One end of the PO pipe can be clamped by the cooperation of the electric push rod three (30) and the clamping plate (31), and at the same time, the telescopic shaft of the electric push rod one (14) drives the trapezoidal plate (13) to move downward, and the trapezoidal plate (13) moves downward so that the support arm (15) rotates inward until the positioning wheel two (20) on the support arm (15) abuts against the outer wall of the steel pipe body (1), and at this time, the positioning wheel one (18) and the two positioning wheels two (20) can guide the movement of the PO pipe; S4: The support plate (9) moves to drive the PO pipe to move forward and enter the heated steel pipe body (1). The PO pipe is partially melted by the heat on the steel pipe body (1) and adheres to the inner wall of the steel pipe body (1). The partially melted PO pipe enters the support groove three (38), the connecting groove two (40) and the connecting groove three (41), so that the steel pipe body (1) and the PO pipe are tightly compounded. S5: The composite steel pipe body (1) is cooled and shaped, and a hydraulic cylinder (29) is used to drive a test plate (28) to extrude the composite steel pipe body (1), so that a pressure test can be performed on the composite steel pipe body (1).

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