A device for reducing the resistance at the junction of a bend and a pipe

Abstract

The application relates to the technical field of water delivery pipes, and provides a resistance reduction treatment device for the connection position of an elbow and a pipe, which comprises a grinder, a controller and a spraying machine.The grinder is used for grinding a first grinding area in the pipe and a second grinding area in the elbow, and comprises a grinding head, a grinding driving motor used for driving the grinding head to rotate, and a moving mechanism used for driving the grinding driving motor and the grinding head to move.The controller is used for determining a convex rough part and a concave rough part, and generating a resistance reduction treatment instruction based on the position of the convex rough part and the position of the concave rough part.The spraying machine is used for spraying a resistance reduction coating on the first grinding area and the second grinding area.The application provides the resistance reduction treatment device for the connection position of the elbow and the pipe, and after the pipe and the elbow are treated by the application, the resistance reduction coating of the resistance reduction treatment area and the flow guide fins in the elbow can be used to sufficiently reduce fluid resistance and achieve better resistance reduction effect.

Description

Technical Field

[0001] This invention relates to the field of water pipeline technology, specifically a drag reduction device at the connection point between an elbow and a pipeline. Background Technology

[0002] During the transportation of liquids through pipelines, resistance losses are inevitable due to the viscosity of the fluids. These losses originate from two main sources: friction loss caused by the roughness of the pipeline wall and localized losses occurring at bends or other obstructions. Localized resistance losses constitute a significant portion of the total resistance loss. Therefore, it is necessary to adopt scientific resistance reduction measures and optimize the design of local pipeline components to achieve low-resistance, energy-saving, and consumption-reducing pipeline distribution systems.

[0003] Chinese patent document CN216555903U discloses a drag-reducing elbow device based on a V-groove flow guide plate. The device includes a bent pipe section, within which a V-groove flow guide plate is fixedly installed to reduce fluid resistance. The V-groove flow guide plate is arc-shaped, with the bend section having the same arc as the V-groove flow guide plate. Multiple parallel V-grooves are provided on both sides of the V-groove flow guide plate, with the extension direction of the V-grooves parallel to the fluid flow direction. This utility model patent's technical solution, by setting a V-groove flow guide plate within the elbow, can segment fluid vortices, reduce some eddies and secondary flows, and rectify the turbulent flow in the bent pipe section. The flow direction of the fluid in the upstream and downstream buffer sections is effectively adjusted, reducing pressure loss in the bent pipe section.

[0004] During actual use, the applicant found that even after applying the aforementioned drag-reducing elbow, the pipeline still had significant resistance. This was mainly because the inner wall of the connection between the elbow and the pipeline was not smooth enough due to factors such as machining precision. This caused the water to encounter significant resistance before entering the elbow, altering the flow pattern and reducing the drag-reducing capacity of the subsequent flow guide plates. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a drag reduction treatment device for the connection between elbows and pipes. After the pipes and elbows are treated by this invention, the drag reduction coating in the drag reduction treatment area and the flow guide grid in the elbow can significantly reduce fluid resistance and achieve a better drag reduction effect.

[0006] To achieve the above objectives, the specific solution adopted by the present invention is as follows: a drag reduction device at the connection position between an elbow and a pipe, comprising: A grinding machine is used to grind the first grinding area inside a pipe and the second grinding area inside an elbow. The grinding machine includes a grinding head, a grinding drive motor for driving the grinding head to rotate, and a moving mechanism for driving the grinding drive motor and the grinding head to move. The grinding head includes a turntable, on which are provided multiple radially sliding telescopic rods and multiple displacement acquisition devices for detecting the displacement of the telescopic rods. Friction blocks are detachably connected to the telescopic rods. The controller is used to determine the raised rough portion and the recessed rough portion in the first grinding area and the second grinding area based on the displacement of the telescopic rod, and to generate drag reduction processing instructions based on the position of the raised rough portion and the position of the recessed rough portion. A spraying machine is used to spray a drag-reducing coating on a first grinding area and a second grinding area. When spraying the drag-reducing coating, the spraying machine sprays the coating with a first thickness on the raised rough parts and a second thickness on the recessed rough parts based on the drag-reducing treatment command. The second thickness is greater than the first thickness.

[0007] As a further optimization of the above-mentioned drag reduction device at the connection between the elbow and the pipe: the grinding machine includes a support mechanism for supporting the pipe or elbow. The support mechanism includes two end support components distributed in a straight line. The end support components include a pressure plate and a support plate arranged above and below each other. A V-shaped receiving groove is opened in the middle of the support plate. The V-shaped receiving groove is used to receive the end of the pipe or the end of the elbow. A support plate with adjustable height is provided between the two end support components. When the support mechanism is used to support the pipeline, both ends of the pipeline are respectively placed into the V-shaped receiving grooves of the two end support components and pressed together by the pressure plate; When the support mechanism is used to support the elbow, the first end of the elbow is placed into the V-shaped receiving groove of one of the end support components and pressed by the pressure plate, and the second end of the elbow is placed on the support plate.

[0008] As a further optimization of the above-mentioned drag reduction device at the connection position of elbow and pipe: the end support assembly includes a base, on which two support plates are provided, and the widths of the V-shaped receiving grooves on the two support plates are different. Two clamping bases are fixedly connected between the two support plates, and two clamping bolts are threadedly connected to the clamping bases. The clamping bolts pass through the pressure plate, and during the rotation of the clamping bolts, they can drive the pressure plate to move downward to press the end of the pipe or the end of the elbow into the V-shaped receiving groove.

[0009] As a further optimization of the above-mentioned drag reduction device at the connection position of the elbow and the pipe: at least one guide rod is fixedly connected to the base of one of the end support components, and a through hole is opened on the base of the other end support component for the guide rod to pass through, so that the distance between the two end support components can be adjusted according to the length of the pipe.

[0010] As a further optimization of the above-mentioned drag reduction device at the connection between the elbow and the pipe: the grinding machine includes a regional positioning component, which includes a positioning support that can move in a straight line and whose position can be fixed. A baffle is raised and lowered on the positioning support. The baffle is used to limit the end of the pipe or the end of the elbow to restrict the range of movement of the grinding head relative to the pipe or the elbow.

[0011] As a further optimization of the above-mentioned drag reduction device for the connection between the elbow and the pipe: the area positioning component includes a positioning plate and two pads for supporting the positioning plate. The positioning plate is rectangular and the positioning support is slidably mounted on the positioning plate along the length direction. The upper surface of the positioning plate is also provided with a plurality of positioning holes evenly distributed along the length direction. An extension plate is fixedly connected to the positioning support, and a positioning bolt is passed through the extension plate. During the rotation of the positioning bolt, it can enter the positioning hole to fix the position of the positioning support.

[0012] As a further optimization of the above-mentioned drag reduction device at the connection position of the elbow and the pipe: the baffle is fixedly connected to at least one push plate parallel to the positioning plate, the positioning support has a cavity inside, the cavity is connected to a fluid storage tank through a guide hole, the cavity is also connected to at least one slide, and the slide extends to the top of the positioning support. A push rod is slidably arranged in the slide. After the fluid in the fluid storage tank enters the slide through the guide hole and the cavity, it can push the push rod to move upward, and the push rod pushes the push plate and the baffle to move upward synchronously.

[0013] As a further optimization of the above-mentioned drag reduction device at the connection between the elbow and the pipe: the moving mechanism includes two parallel guide rails, a sliding seat is slidably arranged on the guide rails, a support plate for supporting the grinding drive motor is slidably connected between the two sliding seats, a lifting driver is arranged below the support plate, the lifting driver drives and connects to a tray, and the upper surface of the tray contacts the support plate.

[0014] As a further optimization of the above-mentioned drag reduction device at the connection position of the elbow and the pipe: the moving mechanism includes a displacement drive screw arranged parallel to one of the guide rails, the displacement drive screw is connected to a displacement drive motor for driving the displacement drive screw to rotate, and a connecting block is provided on the displacement drive screw, the connecting block being fixedly connected to one of the sliding seats.

[0015] As a further optimization of the above-mentioned drag reduction device at the connection between the elbow and the pipe: multiple radially extending mounting holes are provided on the peripheral sidewall of the turntable, one end of the telescopic rod is inserted into the mounting hole, and the telescopic rod is connected to the blind end of the mounting hole by a spring, and the displacement acquisition device is fixedly installed at the blind end of the mounting hole.

[0016] Beneficial effects: After being treated by this invention, pipes and elbows can significantly reduce fluid resistance and achieve better drag reduction by utilizing the drag-reducing coating in the drag-reducing treatment area and the flow guide plates in the elbow. This invention determines the positions of concave and convex rough parts during the grinding process of the first and second grinding areas using a grinding machine, and then sprays drag-reducing coatings of different thicknesses onto these parts. This not only improves the drag reduction effect but also reduces the amount of drag-reducing material used. Attached Figure Description

[0017] Figure 1 This is a schematic diagram showing the locations of the first and second polishing areas; Figure 2 This is a schematic diagram of the concave rough parts and the convex rough parts; Figure 3 This is a schematic diagram of the overall structure of the device of the present invention; Figure 4 This is a schematic diagram illustrating the setup of the lifting drive; Figure 5 This is a schematic diagram of the structure of the area positioning component; Figure 6 This is a schematic diagram of the internal structure of the positioning support; Figure 7 This is a schematic diagram of the grinding head; Figure 8 This is a schematic diagram illustrating the setup of the support plate.

[0018] Figure Descriptions: 1-Pipe, 2-Elbow, 3-Guide grating, 4-First grinding area, 5-Second grinding area, 6-Inner boundary surface, 7-Interface, 8-Repeated grinding area, 9-Concave rough part, 10-Protruding rough part, 11-Support leg, 12-Base plate, 13-Guide rail, 14-Displacement drive motor, 15-Displacement drive screw, 16-Connecting block, 17-Sliding seat, 18-Dovetail groove, 19-Dovetail block, 20-Screw support, 21-Bearing plate, 22-Motor support, 23-Grinding drive motor, 24-Grinding head, 25-Area positioning component, 26-Base, 27-Support plate, 28-V-shaped receiving groove, 29-Support plate, 30-Guide rod, 31-Clamp 32-Base, 33-Clamping bolt, 34-Pressure plate, 35-Clamping block, 36-Groove, 37-Lifting drive, 38-Pattern, 39-Padded block, 40-Positioning plate, 41-Positioning socket, 42-Extension plate, 43-Positioning bolt, 44-Positioning support, 45-Fluid storage tank, 46-Slot, 47-Baffle, 48-Orienting groove, 49-Push plate, 50-Push rod, 51-Channel, 52-Cavity, 53-Slide, 54-Guide hole, 55-Turntable, 56-Mounting hole, 57-Telescopic rod, 58-Spring, 59-Matching screw, 60-Base, 61-Friction block, 62-Inclined surface, 63-Raised part, 64-Displacement collector, 65-Height adjustment screw. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figures 1 to 3 As shown, the present invention provides a drag reduction device for the connection between an elbow and a pipe, including a grinder, a controller, and a sprayer.

[0021] A grinding machine is used to grind the first grinding area 4 inside the pipe 1 and the second grinding area 5 inside the elbow 2. The grinding machine includes a grinding head 24, a grinding drive motor 23 for driving the grinding head 24 to rotate, and a moving mechanism for driving the grinding drive motor 23 and the grinding head 24 to move. The grinding head 24 includes a turntable 55, on which a plurality of radially sliding telescopic rods 57 are provided and a plurality of displacement acquisition devices 64 for detecting the displacement of the telescopic rods 57 are provided. The telescopic rods 57 are detachably connected to friction blocks 61.

[0022] The controller is used to determine the raised rough portion 10 and the recessed rough portion 9 in the first grinding area 4 and the second grinding area 5 based on the displacement of the telescopic rod 57, and to generate a drag reduction processing command based on the position of the raised rough portion 10 and the position of the recessed rough portion 9.

[0023] A spraying machine is used to spray a drag-reducing coating on a first grinding area 4 and a second grinding area 5. When spraying the drag-reducing coating, the spraying machine sprays the coating on the raised rough portion 10 with a first thickness and on the recessed rough portion 9 with a second thickness based on the drag-reducing treatment instruction. The second thickness is greater than the first thickness.

[0024] This invention is used to reduce drag at the connection point between elbow 2 and pipe 1. The elbow 2 has internal guide vanes 3 to reduce drag. The drag reduction at the connection point and the guide vanes 3 work together to reduce the fluid resistance of the elbow 2, thereby reducing energy consumption in fluid transport. In use, a first grinding area 4 and a second grinding area 5 are first determined based on the dimensions of pipe 1 and elbow 2. The first grinding area 4 is located at the end of pipe 1, and the second grinding area 5 is located at the end of elbow 2. The width of the first grinding area 4 and the second grinding area 5 is determined based on the dimensions of pipe 1 and elbow 2; the larger the inner diameter of pipe 1 and elbow 2, the larger the width of the first grinding area 4 and the second grinding area 5. Then, a grinding machine is used to grind the first grinding area 4 and the second grinding area 5. The specific grinding process is as follows: First, the grinding drive motor 23 and the grinding head 24 are moved synchronously by the moving mechanism until the axis of the grinding drive motor 23 is collinear with the axis of the pipe 1 or the elbow 2; then, the grinding drive motor 23 drives the grinding head 24 to rotate, and the moving mechanism drives the grinding drive motor 23 to move along the axis, thereby placing the grinding head 24 into the pipe 1 or the elbow 2; during the rotation of the grinding head 24, the telescopic rod 57 extends outward along the radial direction of the turntable 55, thereby causing the friction block 61 to contact the inner wall of the pipe 1 or the elbow 2, and then the friction block 61 generates mechanical friction with the inner wall of the pipe 1 or the elbow 2 to achieve grinding of the first grinding area 4 and the second grinding area 5; during the friction process, the friction block 61 contacts the first grinding area 4 and the second grinding area 5. If there is a rough part 10 containing multiple protruding obstacles in the first grinding area 4 or the second grinding area 5, the friction block... When friction block 61 contacts the raised rough part 10, it will be displaced radially along the turntable 55, and the telescopic rod 57 will be displaced synchronously. At this time, the displacement acquisition device 64 can collect the displacement of friction block 61 and telescopic rod 57. Based on the collected displacement, the controller can determine that there is a raised rough part 10 in the first grinding area 4 or the second grinding area 5, and then determine the position of the raised rough part 10 based on the position of friction block 61. If there is a recessed rough part 9 containing multiple pits in the first grinding area 4 or the second grinding area 5, friction block 61 can pass smoothly through the recessed rough part 9 without being displaced radially along the turntable 55. The displacement acquisition device 64 will not be able to collect the displacement. Based on the case that the displacement is zero, the controller can determine that there is a recessed rough part 9 in the first grinding area 4 or the second grinding area 5, and then determine the position of the recessed rough part 9 based on the position of friction block 61.Because the roughness of the raised rough portion 10 will significantly decrease after grinding, while the roughness of the recessed rough portion 9 may not be ground or its roughness will not decrease significantly after grinding, different degrees of drag reduction treatment are required for the recessed rough portion 9 and the raised rough portion 10. To facilitate appropriate drag reduction treatment in the future, the controller generates drag reduction instructions based on the positions of the raised rough portion 10 and the recessed rough portion 9. It should be noted that in this invention, the grinding machine grinds the first grinding area 4 and the second grinding area 5 to reduce the roughness of the recessed rough portion 9 and the raised rough portion 10 as much as possible, rather than completely eliminating the recessed rough portion 9 and the raised rough portion 10. This would require extensive grinding of the pipe 1 and the elbow 2, which would significantly enlarge the inner diameter of the pipe 1 and the elbow 2, thereby forming steps between the first grinding area 4 and other parts of the pipe 1, and between the second grinding area 5 and other parts of the elbow 2, which would be detrimental to drag reduction. Based on this, after being processed by the grinding machine, the raised rough portion 10 still protrudes towards the interior of the pipe 1 or elbow 2 relative to the recessed rough portion 9. After grinding, a drag-reducing coating is sprayed onto the first grinding area 4 and the second grinding area 5 using a spraying machine. The drag-reducing coating on the raised rough portion 10 has a smaller first thickness, while the drag-reducing coating on the recessed rough portion 9 has a larger second thickness, so as to smooth the inner walls of the first grinding area 4 and the second grinding area 5. By spraying the drag-reducing coating, the resistance of the first grinding area 4 and the second grinding area 5 to the fluid can be reduced. In addition, the portion that was ground away by the grinding machine can be filled, so that the first grinding area 4 and other parts of the pipe 1 remain smooth, and the second grinding area 5 and other parts of the elbow 2 remain smooth, thereby improving the drag-reducing effect. It should be noted that the specific materials of the drag-reducing coating, the specific selection of the controller, and the specific structure of the spraying machine are all mature existing technologies. For example, the drag-reducing coating can be made of resin materials, etc., which will not be elaborated here.

[0025] After being treated by this invention, pipe 1 and elbow 2 can be connected via flange connection. After connection, the first grinding area 4 and the second grinding area 5 come into contact. The interface 7 between the first grinding area 4 and the second grinding area 5 is the end face of pipe 1 and elbow 2. The first grinding area 4 and the second grinding area 5 after applying the drag-reducing coating can be collectively referred to as the drag-reducing treatment area. During flow, the fluid passes through the drag-reducing treatment area and enters elbow 2. With the help of the drag-reducing coating in the drag-reducing treatment area and the flow guide grates 3 in elbow 2, fluid resistance can be significantly reduced, achieving a better drag-reducing effect. Furthermore, to facilitate grinding by the grinding machine, the inner boundary surface 6 of the second grinding area 5 is parallel to the interface 7.

[0026] Furthermore, during the grinding process of the first grinding area 4 and the second grinding area 5 using a grinding machine, the present invention determines the positions of the recessed rough portion 9 and the raised rough portion 10, and then sprays drag-reducing coatings of different thicknesses onto the recessed rough portion 9 and the raised rough portion 10, which can both improve the drag-reducing effect and reduce the amount of drag-reducing material used.

[0027] like Figure 3 As shown, the specific structure of the grinding machine is as follows.

[0028] The grinder includes a base plate 12 and multiple support legs 11 for supporting the base plate 12. The grinder drive motor 23, the grinder head 24, and the moving mechanism are all mounted on the base plate 12. Self-locking casters can also be installed at the lower end of the support legs 11 to facilitate the movement of the grinder. Casters are a conventional technology, and their specific structure and principle will not be described in detail here.

[0029] To ensure the stability of pipe 1 and elbow 2 during the grinding process and thus guarantee the grinding effect, the grinding machine includes a support mechanism for supporting pipe 1 or elbow 2. The support mechanism includes two end support components arranged in a straight line. Each end support component includes a pressure plate 33 and a support plate 27 positioned vertically. A V-shaped receiving groove 28 is formed in the middle of the support plate 27 to accommodate the end of pipe 1 or elbow 2. A height-adjustable support plate 29 is positioned between the two end support components. When the support mechanism supports pipe 1, both ends of pipe 1 are placed into the V-shaped receiving grooves 28 of the two end support components and pressed tightly by the pressure plate 33. When the support mechanism supports elbow 2, the first end of elbow 2 is placed into the V-shaped receiving groove 28 of one of the end support components and pressed tightly by the pressure plate 33, while the second end of elbow 2 rests on the support plate 29.

[0030] When grinding pipe 1 and elbow 2, a support mechanism is first used to support them. When supporting pipe 1, both ends of pipe 1 are placed inside the V-shaped receiving grooves 28 of the support plates 27 in the two end support components. The V-shaped receiving grooves 28 can accommodate pipes 1 of different diameters, and then the pressure plate 33 is used to press the pipe 1 firmly. When supporting elbow 2, one end of elbow 2 is placed inside the V-shaped receiving groove 28 of the support plate 27 in one of the end support components and pressed firmly by the pressure plate 33. The other end of elbow 2 rests on the support plate 29. By adjusting the height of the support plate 29, elbow 2 can be kept parallel to the base plate 12, preventing it from tilting. Furthermore, elbows 2 of different lengths can be supported using the support plate 29; only the height of the support plate 29 needs to be adjusted, making it more convenient to use. Figure 8As shown, a height adjustment screw 65 is coaxially fixedly connected to the support plate 29. An adjustment screw hole is provided on the base plate 12 for the height adjustment screw 65 to pass through. By rotating the support plate 29, the height adjustment screw 65 can be driven to rotate, thereby moving the height adjustment screw 65 up and down to change the height of the support plate 29, so as to support the elbow 2 in a state parallel to the base plate 12.

[0031] Furthermore, the end support assembly includes a base 26 mounted on the base plate 12. Two support plates 27 are mounted on the base 26, and the V-shaped receiving grooves 28 on the two support plates 27 have different widths. Two clamping bases 31 are fixedly connected between the two support plates 27, and two clamping bolts 32 are threadedly connected to the clamping bases 31. The clamping bolts 32 pass through a pressure plate 33. During rotation, the clamping bolts 32 can drive the pressure plate 33 to move downwards, pressing the end of the pipe 1 or the end of the elbow 2 into the V-shaped receiving groove 28. The support plate 27 with the smaller V-shaped receiving groove 28 is closer to the grinding drive motor 23. When the end support assembly supports the end of the elbow 2, because the other support plate 27 has a larger V-shaped receiving groove 28, the elbow 2 can smoothly pass through the V-shaped receiving groove 28 without being jammed. After placing the end of pipe 1 or elbow 2 into the V-shaped receiving groove 28, rotate the clamping bolt 32 to move it downwards. The head of the clamping bolt 32 then pushes the pressure plate 33 to move until the pressure plate 33 clamps the pipe 1 or elbow 2. In one embodiment of the invention, the pressure plate 33 is fixedly connected to a pressure block 34. The lower surface of the pressure block 34 has a groove 35. The pressure block 34 can be made of a soft material such as rubber. During the downward movement of the pressure plate 33, the pressure block 34 contacts and squeezes the pipe 1 and elbow 2, thus clamping the pipe 1 and elbow 2.

[0032] To process pipes 1 of different lengths, at least one guide rod 30 is fixedly connected to the base 26 of one end support assembly, and a through hole is provided on the base 26 of the other end support assembly for the guide rod 30 to pass through, so that the distance between the two end support assemblies can be adjusted according to the length of the pipe 1. Based on this, one base 26 connected to the guide rod 30 is fixedly mounted on the base plate 12, and the other base 26 is movably mounted on the base plate 12. This arrangement allows for adjustment of the distance between the two end support assemblies, thereby meeting the processing requirements of pipes 1 of different lengths.

[0033] like Figure 3 and Figure 5As shown, in order to simplify the operation complexity of the moving mechanism, in this invention, the moving mechanism drives the grinding drive motor 23 and the grinding head 24 to move according to a fixed forward distance. Then, by adjusting the position of the pipe 1 and the elbow 2, the grinding machine can accurately grind the first grinding area 4 and the second grinding area 5. On this basis, in order to accurately position the pipe 1 and the elbow 2, the grinding machine includes an area positioning component 25. The area positioning component 25 includes a positioning support 44 that can move in a straight line, and the position of the positioning support 44 can be fixed. A baffle 47 is raised and lowered on the positioning support 44. The baffle 47 is used to limit the end of the pipe 1 or the end of the elbow 2 to limit the movement range of the grinding head 24 relative to the pipe 1 or the elbow 2. By setting the area positioning component 25, before placing the pipe 1 and elbow 2 on the support mechanism, the position of the positioning support 44 is adjusted to change the distance between the positioning support 44 and the end support component at the fixed position. Then, the height of the baffle 47 is adjusted according to the diameter of the pipe 1 and elbow 2 to ensure that the ends of the pipe 1 and elbow 2 can contact the baffle 47 and that the baffle 47 does not obstruct the ends of the pipe 1 and elbow 2, so as to ensure that the grinding head 24 can smoothly enter the interior of the pipe 1 and elbow 2. After adjusting the positioning support 44 and the baffle 47, the support mechanism is used to support the pipe 1 and elbow 2, and the position of the pipe 1 and elbow 2 is adjusted to ensure that the end of the elbow 2 of the pipe 1 contacts the baffle 47. Then, the moving mechanism drives the grinding drive motor 23 and the grinding head 24 to grind the pipe 1 and the elbow 2. During the process, the moving mechanism adjusts the axial position of the grinding drive motor 23 and the grinding head 24. After grinding begins, the moving mechanism only needs to drive the grinding drive motor 23 and the grinding head 24 to move along the axis according to the preset forward distance. It should also be noted that the larger the width of the first grinding area 4 and the second grinding area 5, the closer the positioning support 44 is to the grinding drive motor 23, and vice versa.

[0034] Furthermore, the positioning support 44 is specifically configured as follows: the area positioning component 25 includes a positioning plate 40 and two pads 39 for supporting the positioning plate 40. The pads 39 are fixedly mounted on the base plate 12. The positioning support 44 has a channel 51 for the positioning plate 40 to pass through. The positioning plate 40 is rectangular and the positioning support 44 is slidably mounted on the positioning plate 40 along its length. The upper surface of the positioning plate 40 also has multiple positioning holes 41 evenly distributed along its length. The positioning support 44 is fixedly connected to an extension plate 42. A positioning bolt 43 passes through the extension plate 42. During rotation, the positioning bolt 43 can enter the positioning hole 41 to fix the position of the positioning support 44. In addition, the positioning support 44 has a slot 46 extending to the top, and the baffle 47 is raised and lowered in the slot 46. A directional protrusion is fixedly provided on one inner wall of the slot 46, and the baffle 47 has a directional groove 48. The directional protrusion extends into the directional groove 48 to control the direction of the baffle 47 and prevent the baffle 47 from tilting.

[0035] like Figure 6 As shown, in order to facilitate the adjustment of the height of the baffle 47, the baffle 47 is fixedly connected to at least one push plate 49 that is parallel to the positioning plate 40. The positioning support 44 has a cavity 52 inside, which is connected to a fluid storage tank 45 through a guide hole 54. The cavity 52 is also connected to at least one slide 53, which extends to the top of the positioning support 44. A push rod 50 is slidably arranged in the slide 53. After the fluid in the fluid storage tank 45 enters the slide 53 through the guide hole 54 and the cavity 52, it can push the push rod 50 to move upward, and the push rod 50 pushes the push plate 49 and the baffle 47 to move upward synchronously. When fluid flows out of the fluid storage tank 45, it passes through the guide hole 54 into the cavity 52, and then into the slide 53, pushing the push rod 50 upward. The push rod 50 then pushes the push plate 49 and the baffle 47 upward simultaneously. When fluid flows from the cavity 52 into the fluid storage tank 45 through the guide hole 54, the baffle 47, push plate 49, and push rod 50 move downward under gravity. Obviously, the fluid storage tank 45 should be equipped with a bidirectional pump for controlling the fluid flow direction; this is mature prior art and will not be described further here. In one embodiment of the invention, water is used as the fluid.

[0036] The specific structure of the moving mechanism is as follows: The moving mechanism includes two parallel guide rails 13, with sliding seats 17 slidably mounted on the guide rails 13. A support plate 21 for supporting the grinding drive motor 23 is slidably connected between the two sliding seats 17. A lifting driver 37 is provided below the support plate 21, and a support plate 38 is driven and connected to the lifting driver 37. The upper surface of the support plate 38 is in contact with the support plate 21. Figure 4As shown, a bracket 36 is fixedly connected to the lower surface of the base plate 12, and a lifting drive 37 is fixedly mounted on the bracket 36. The lifting drive 37 can be a conventional component such as a hydraulic cylinder. The lifting drive 37 can drive the support plate 38 to move up and down. During the upward movement, the support plate 38 pushes the bearing plate 21 upward, thereby changing the height of the grinding drive motor 23. By driving the sliding seat 17 to move along the guide rail 13, the sliding seat 17 can drive the bearing plate 21 to move along the direction of the guide rail 13, thereby driving the grinding drive motor 23 to move axially, and then driving the grinding head 24 into the interior of the pipe 1 and the elbow 2 to grind the first grinding area 4 and the second grinding area 5. It should also be noted that because the end positioning component in the support mechanism uses a V-shaped receiving groove 28 to accommodate the pipe 1 and the elbow 2, the pipe 1 and the elbow 2 naturally move towards the center during placement, which naturally achieves the centering of the pipe 1 and the elbow 2. Based on this, the only difference in height between the axis of the grinding drive motor 23 and the axes of the pipe 1 and the elbow 2 is due to the change in the diameter of the pipe 1 and the elbow 2. Therefore, only the height of the grinding drive motor 23 needs to be adjusted.

[0037] Furthermore, the moving mechanism includes a displacement drive screw 15 parallel to one of the guide rails 13. The displacement drive screw 15 is connected to a displacement drive motor 14 for driving the displacement drive screw 15 to rotate, and a connecting block 16 is fitted on the displacement drive screw 15. The connecting block 16 is fixedly connected to one of the sliding seats 17. By driving the displacement drive screw 15 to rotate through the displacement drive motor 14, the connecting block 16 can be moved, which in turn drives the sliding seat 17 to move. During the movement of the sliding seat 17, the bearing plate 21 and the grinding drive motor 23 move synchronously.

[0038] Furthermore, the first end of the displacement drive screw 15 is connected to the displacement drive motor 14, and the second end of the displacement drive screw 15 is supported by a screw support 20 fixedly mounted on the base plate 12; a motor support 22 for supporting the grinding drive motor 23 is fixedly mounted on the bearing plate 21; a dovetail groove 18 extending in a direction perpendicular to the base plate 12 is provided on the sliding seat 17, and a dovetail block 19 slidably mounted in the dovetail groove 18 is fixedly connected to the bearing plate 21 to achieve a sliding connection between the bearing plate 21 and the sliding seat 17. These are all conventional technologies and will not be described in detail here.

[0039] like Figure 7As shown, the specific structure of the grinding head 24 is as follows: Multiple radially extending mounting holes 56 are provided on the peripheral wall of the turntable 55. These mounting holes 56 are blind holes. One end of the telescopic rod 57 is inserted into the mounting hole 56, and the telescopic rod 57 is connected to the blind end of the mounting hole 56 by a spring 58. The displacement acquisition device 64 is fixedly installed at the blind end of the mounting hole 56. Depending on the actual situation, the spring 58 can be used in two ways: first, it pushes the telescopic rod 57 outward, causing the friction block 61 to press against the inner wall of the pipe 1 and the elbow 2. This method is suitable for low-speed rotation of the grinding head 24; second, it pulls the telescopic rod 57 inward, and during the rotation of the grinding head 24, centrifugal force causes the telescopic rod 57 to be thrown outward, making the friction block 61 contact the inner wall of the pipe 1 and the elbow 2. This method is suitable for high-speed rotation of the grinding head 24. The displacement acquisition device 64 can use the principle of laser ranging to monitor the displacement state of the telescopic rod 57, which is a mature existing technology and will not be elaborated further here.

[0040] Furthermore, the friction block 61 includes a base 60, which is detachably connected to the telescopic rod 57 via a mating screw 59, facilitating the replacement of the friction block 61. Obviously, mating screw holes matching the mating screw 59 should be provided on the base 60 and the telescopic rod 57. In addition, the friction block 61 is provided with a raised portion 63, and an inclined surface 62 is provided between the raised portion 63 and the base 60. During the grinding process, the inclined surface 62 faces forward so that the friction block 61 can smoothly pass through the raised rough portion 10.

[0041] In one embodiment of the present invention, if there is a difference in the inner diameter of the pipe 1 and the elbow 2, after grinding the first grinding area 4 and the second grinding area 5, a part of the first grinding area 4 and a part of the second grinding area 5 can be combined into a repeated grinding area 8, and then the repeated grinding area 8 can be ground again to reduce the difference in the inner diameter of the pipe 1 and the elbow 2 and further improve the drag reduction effect.

[0042] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A drag reduction device at the connection point between an elbow and a pipe, characterized in that, include: A grinding machine is used to grind the first grinding area (4) inside the pipe (1) and the second grinding area (5) inside the elbow (2). The grinding machine includes a grinding head (24), a grinding drive motor (23) for driving the grinding head (24) to rotate, and a moving mechanism for driving the grinding drive motor (23) and the grinding head (24) to move. The grinding head (24) includes a turntable (55). The turntable (55) is provided with multiple radially sliding telescopic rods (57) and multiple displacement acquisition devices (64) for detecting the displacement of the telescopic rods (57). The telescopic rods (57) are detachably connected to friction blocks (61). The controller is used to determine the raised rough portion (10) and the recessed rough portion (9) in the first grinding area (4) and the second grinding area (5) based on the displacement of the telescopic rod (57), and to generate a drag reduction processing command based on the position of the raised rough portion (10) and the position of the recessed rough portion (9). A spraying machine is used to spray a drag-reducing coating on a first grinding area (4) and a second grinding area (5). When spraying the drag-reducing coating, the spraying machine sprays the coating with a first thickness on the raised rough portion (10) and a second thickness on the recessed rough portion (9) based on the drag-reducing treatment instruction. The second thickness is greater than the first thickness.

2. The drag reduction device at the connection point between an elbow and a pipe as described in claim 1, characterized in that, The grinding machine includes a support mechanism for supporting the pipe (1) or the elbow (2). The support mechanism includes two end support components distributed in a straight line. The end support components include a pressure plate (33) and a support plate (27) arranged above and below. A V-shaped receiving groove (28) is provided in the middle of the support plate (27). The V-shaped receiving groove (28) is used to receive the end of the pipe (1) or the end of the elbow (2). A support plate (29) with adjustable height is provided between the two end support components. When the support mechanism is used to support the pipe (1), both ends of the pipe (1) are respectively placed into the V-shaped receiving grooves (28) of the two end support components and pressed by the pressure plate (33); When the support mechanism is used to support the elbow (2), the first end of the elbow (2) is placed into the V-shaped receiving groove (28) of one of the end support components and pressed by the pressure plate (33), and the second end of the elbow (2) is placed on the support plate (29).

3. The drag reduction device at the connection point between an elbow and a pipe as described in claim 2, characterized in that, The end support assembly includes a base (26), on which two support plates (27) are provided. The widths of the V-shaped receiving grooves (28) on the two support plates (27) are different. Two clamping bases (31) are fixedly connected between the two support plates (27). Two clamping bolts (32) are threadedly connected to the clamping bases (31). The clamping bolts (32) pass through the pressure plate (33). During the rotation of the clamping bolts (32), they can drive the pressure plate (33) to move downward to press the end of the pipe (1) or the end of the elbow (2) into the V-shaped receiving groove (28).

4. The drag reduction device at the connection point between an elbow and a pipe as described in claim 3, characterized in that, One of the end support components has at least one guide rod (30) fixedly connected to its base (26), and the other end support component has a through hole on its base (26) for the guide rod (30) to pass through, so that the distance between the two end support components can be adjusted according to the length of the pipe (1).

5. The drag reduction device at the connection point between an elbow and a pipe as described in claim 1, characterized in that, The grinding machine includes a region positioning component (25), which includes a positioning support (44) that can move in a straight line and whose position can be fixed. A baffle (47) is provided on the positioning support (44) and is used to limit the end of the pipe (1) or the end of the elbow (2) to restrict the movement range of the grinding head (24) relative to the pipe (1) or the elbow (2).

6. The drag reduction device at the connection between an elbow and a pipe as described in claim 5, characterized in that, The area positioning component (25) includes a positioning plate (40) and two pads (39) for supporting the positioning plate (40). The positioning plate (40) is rectangular and the positioning support (44) is slidably disposed on the positioning plate (40) along the length direction. The upper surface of the positioning plate (40) is also provided with a plurality of positioning holes (41) evenly distributed along the length direction. The positioning support (44) is fixedly connected to an extension plate (42). A positioning bolt (43) is passed through the extension plate (42). The positioning bolt (43) can enter the positioning hole (41) during rotation to fix the position of the positioning support (44).

7. The drag reduction device at the connection point between an elbow and a pipe as described in claim 6, characterized in that, The baffle (47) is fixedly connected to at least one push plate (49) that is parallel to the positioning plate (40). The positioning support (44) has a cavity (52) inside. The cavity (52) is connected to a fluid storage tank (45) through a guide hole (54). The cavity (52) is also connected to at least one slide (53). The slide (53) extends to the top of the positioning support (44). A push rod (50) is slidably arranged in the slide (53). After the fluid in the fluid storage tank (45) enters the slide (53) through the guide hole (54) and the cavity (52), it can push the push rod (50) to move upward. The push rod (50) pushes the push plate (49) and the baffle (47) to move upward synchronously.

8. The drag reduction device at the connection point between an elbow and a pipe as described in claim 1, characterized in that, The moving mechanism includes two parallel guide rails (13), a sliding seat (17) is slidably arranged on the guide rails (13), a support plate (21) for supporting the grinding drive motor (23) is slidably connected between the two sliding seats (17), a lifting driver (37) is arranged below the support plate (21), the lifting driver (37) drives a tray (38) to be connected, and the upper surface of the tray (38) is in contact with the support plate (21).

9. The drag reduction device at the connection point between an elbow and a pipe as described in claim 8, characterized in that, The moving mechanism includes a displacement drive screw (15) arranged parallel to one of the guide rails (13) on the side. The displacement drive screw (15) is connected to a displacement drive motor (14) for driving the displacement drive screw (15) to rotate. A connecting block (16) is provided on the displacement drive screw (15), and the connecting block (16) is fixedly connected to one of the sliding seats (17).

10. The drag reduction device at the connection between an elbow and a pipe as described in claim 1, characterized in that, The turntable (55) has multiple radially extending mounting holes (56) on its peripheral sidewall. One end of the telescopic rod (57) is inserted into the mounting hole (56), and the telescopic rod (57) is connected to the blind end of the mounting hole (56) by a spring (58). The displacement acquisition device (64) is fixedly installed at the blind end of the mounting hole (56).

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