A method for manufacturing a large cactus tube

Abstract

This invention discloses a method for manufacturing a large cactus-shaped pipe fitting, belonging to the field of pipe fitting manufacturing technology. The method includes steps such as cactus pipe fitting simulation modeling; layout and manufacturing of the main pipe fitting A; layout and manufacturing of branch pipes B and C; and assembling the cactus pipe fitting using an inverted assembly method. When manufacturing the intermediate cone of the main pipe fitting, after CNC cutting, cutting points are reserved for each opening. After the cone is rounded, the reserved cutting points are removed. When manufacturing the cactus-shaped bend, a straight pipe cutting method is used. After CNC cutting, the intersection line is cut using point-line cutting. After rolling into a straight cylinder, the cutting points are cut according to the intersection line. A cactus-shaped bend cutting / welding device is also provided to simultaneously perform cutting / welding of two intersection lines on the straight cylinder. This invention can effectively reduce opening deviation and material waste, improve assembly accuracy and construction efficiency, shorten the manufacturing cycle, and improve manufacturing quality.

Description

Technical Field

[0001] This invention mainly relates to the field of pipe fitting manufacturing technology, specifically a method for manufacturing a large cactus pipe fitting. Background Technology

[0002] The cactus-shaped nozzle is a crucial component in the dehydrogenation reactor. Its structure is as follows: Figure 1 As shown, it includes a main connector A, branch connector B, and branch connector C. Branch connector B and branch connector C are connected in a through manner to both sides of the main connector A. Because its shape resembles a cactus, it is called a cactus connector.

[0003] The manufacturing process of the cactus-shaped pipe joint is complex. The joint has a large diameter and requires high dimensional accuracy. During assembly, the ABC joints extend to a height of 8.25 meters, and the flatness and distance tolerances between the ABC flanges are critical. The forward assembly method involves a high construction height, making it quite challenging. Due to the thick walls and large diameter of the cactus-shaped pipe joint, traditional intersection line cutting machines cannot achieve automatic cutting, requiring special processes. Furthermore, the matching degree between the opening size on the main pipe cone and the obliquely inserted branch pipe is crucial. Currently, the manufacturing of irregularly shaped components such as cone openings and large pipe intersection lines relies on manual layout, beveling, welding, and assembly, resulting in a long manufacturing cycle and difficulty in guaranteeing quality. Moreover, the unique structure of the cactus-shaped bend makes the cutting and welding operations during its manufacturing process inconvenient. Summary of the Invention

[0004] The present invention addresses the problem that existing technical solutions are too simplistic and provides a solution that is significantly different from existing technologies. It mainly provides a method for manufacturing large cactus tubes, thereby solving the technical problems mentioned in the background section of the present invention, such as the long manufacturing cycle and difficulty in guaranteeing the quality of existing large cactus tubes.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0006] A method for manufacturing a large cactus support tube includes the following steps:

[0007] S1. Cactus tuber simulation modeling: using computer software to model and unfold the specimen;

[0008] S2. Laying out and manufacturing of main pipe A: For its middle cone, first lay out to obtain the fan-shaped development diagram, then confirm the position and size of the hole to be opened on the middle cone, leave some blanking points when cutting, and reserve at least 6 cutting points for each opening part. After the cone is rounded, remove the reserved cutting points to complete the manufacturing of the middle cone.

[0009] S3. Laying out and manufacturing of branch pipes B and C: The shrimp bend of branch pipe B is made by cutting straight pipe. First, according to the diameter of the center distance of the shrimp bend and the angle of each shrimp bend segment, the layout is carried out to confirm the length of the straight pipe and the size of the intersection line, and the shrimp bend development diagram is obtained. Then, when cutting the shrimp bend, the intersection line is required to be cut at the point, and the two ends are left uncut to prevent the two ends from being cut and unable to be joined during the rolling process. After cutting, the roll is rolled into a straight cylinder. According to the intersection line, the cut line is cut at the point, and the end face bevel of the assembly area is ground. Finally, the assembly and welding are carried out directly according to the shrimp bend forming diagram to complete the manufacturing of the shrimp bend.

[0010] S4. Cactus-shaped connecting pipe forming: Using the inverted method, the flange of the main connecting pipe A is facing down. The flange is fixed to the tooling with bolts and leveled. The tooling is used to assemble the branch pipes B and C obliquely inserted into the conical opening area of ​​the main connecting pipe A. At the same time, the branch pipes are fixed to the tooling and the pipe ends are welded together. The relative center distance of the three cactus flanges and the 30° tilt angle of the branch pipe C flange face are ensured, thus completing the forming of the large cactus connecting pipe.

[0011] Specifically, in step S1, the Rhino software and CAD are used to unfold the pattern.

[0012] Specifically, in step S2, the profile of the flat plate opening of the intermediate cone is determined by the method of manufacturing complex intersecting line pipe nodes. Each branch pipe on the node is unfolded, and the intersection of the inner and outer walls of the branch pipe is used as the reference point. The inner and outer wall lines of the opening are selected. The inner wall line is selected in the toe area and the outer wall line is selected in the root area to obtain the shape of the opening. The steel plate is divided into N equal parts from the lowest point of the opening to cut the opening.

[0013] Furthermore, in step S3, for the inclined insertion tube, the cutting size is determined by laying out the tube according to its diameter and angle; when cutting the inclined insertion tube, dot-line cutting is used on the intersection line side; after the rolling and welding are completed, the excess material at the intersection line is removed.

[0014] Furthermore, in step S4, the installation orientation of the pipe assembly tooling is confirmed according to the relative positions of the ABC pipe flanges, and the tooling is spot welded and fixed to the assembly platform, wherein the installation angle of the branch pipe C pipe assembly tooling is consistent with that of the C pipe flange.

[0015] As an optimization of the above solution, in step S3, the straight cylinder is cut and welded using a shrimp-bending cutting / welding device. The structure of the shrimp-bending cutting / welding device is as follows: it includes a fixed cylinder, on the inner surface of which a first annular groove and a second annular groove corresponding to two intersecting lines on the straight cylinder are respectively formed. A rotatable rotating ring coaxially arranged with the fixed cylinder is fitted on the inner surface of the fixed cylinder. A first moving rod and a second moving rod are slidably connected to the rotating ring. A first processing head and a first limiting block extending into the first annular groove are installed on the first moving rod. A second processing head and a second limiting block located in the second annular groove are detachably installed on the second moving rod. A drive mechanism for driving the rotating ring to rotate is also installed on the fixed cylinder.

[0016] Furthermore, the first moving rod and the second moving rod are located on opposite sides of the rotating ring, and the moving directions of the first moving rod and the second moving rod are parallel to the axis of the fixed cylinder.

[0017] Furthermore, the driving mechanism includes a gear ring disposed on the outer ring surface of the rotating ring and a gear driven by a motor. The fixed cylinder has a notch that exposes the gear ring, and the gear meshes with the gear ring at the notch.

[0018] Furthermore, during cutting, the first and second processing heads use cutting tools to drive the rotating ring to rotate, and the first and second moving rods rotate accordingly. Under the limiting effect of the first annular groove on the first limiting block and the limiting effect of the second annular groove on the second limiting block, the movement trajectory of the first processing head conforms to the shape of the first annular groove, and the movement trajectory of the second processing head conforms to the shape of the second annular groove, so as to simultaneously cut the two intersecting lines on the straight cylinder. During welding, the first and second processing heads use welding tools to keep the middle section of the straight cylinder stationary, change the shape of the upper and lower sections, and then start the device to simultaneously weld the three sections of the shrimp-shaped bend, thus completing the forming of the shrimp-shaped bend.

[0019] Furthermore, both the first and second processing heads are connected to an electric telescopic rod at their mounting ends. The electric telescopic rod is used to drive the corresponding processing head to move along the slope of the corresponding annular groove to accommodate straight cylinders of different diameters.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] This invention utilizes computer software to model and unfold cactus nozzles, enabling CNC cutting. By modeling, the intersecting line is formed and pre-drilled holes are made before the nozzle is rolled, which can effectively reduce hole deviation and material waste, improve assembly accuracy and construction efficiency, thereby shortening the manufacturing cycle and improving the production quality.

[0022] In this invention, during the fabrication of the central cone of the main connector, after CNC blanking, at least six cutting points are reserved for each opening. These reserved cutting points are removed after the cone is rounded. Compared to the existing method of manually cutting the intersection lines after forming, this method ensures the accuracy of the intersection line's position and dimensions, and is more efficient. Compared to directly cutting off the opening portion after blanking and then rolling it, this method avoids the problem of straight edges forming due to uneven stress during the rolling process. This shortens the manufacturing cycle and improves the production quality.

[0023] This invention utilizes a straight tube cutting method to manufacture the shrimp-shaped bend. After CNC cutting, the intersection line is cut with dotted lines, which facilitates the indication of subsequent cutting trajectories and reduces the workload of subsequent cutting. Furthermore, excess material is left uncut at both ends to prevent issues with joining during rolling if the ends are cut. After rolling into a straight cylinder, the cut points are made according to the intersection line, eliminating the need for further layout. Assembly and welding can then be performed directly according to the shrimp-shaped bend forming diagram. This method accelerates production efficiency while ensuring the forming quality of the shrimp-shaped bend.

[0024] This invention employs an inverted assembly method for the cactus-shaped pipe joint. The main pipe A, branch pipe B, and branch pipe C are fixed to a fixture with their flanges facing downwards. The fixture is then used to assemble the branch pipes B and C into the conical opening area between them and the main pipe A. Finally, the intersecting lines are welded. Compared to the forward assembly method, this significantly reduces the construction height, facilitates construction and measurement, greatly improves installation efficiency, reduces the cost of tooling materials, and minimizes safety hazards during construction.

[0025] The optimized solution of this invention provides a cactus bend cutting / welding device. The rotation of a rotating ring drives two processing heads to work synchronously. Simultaneously, the limiting effect of two annular grooves matching the target intersection line causes the two processing heads to move along the trajectory matching the target intersection line, ultimately allowing the two processing heads to simultaneously perform cutting / welding of the two intersection lines on the straight cylinder. During the cactus bend manufacturing process, a cutting tool is used for cutting; for welding, the cutting tool is replaced with a welding tool. This allows for the completion of both cutting and welding of the cactus bend material with a single device, making it convenient to use, improving work efficiency, shortening the manufacturing cycle of cactus bends, and enhancing production quality.

[0026] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0027] Figure 1 A schematic diagram of the cactus receptacle structure;

[0028] Figure 2 and Figure 3This is a simulation modeling diagram of the cactus tube receptacle in this invention, wherein, Figure 2 This is a diagram showing the overall structure of the cactus taking over. Figure 3 Diagram of the cactus's stalks;

[0029] Figure 4 This is an unfolded view of the intermediate cone of the main pipe A in the embodiment;

[0030] Figure 5 A schematic diagram showing the cutting and pre-reservation of the intermediate cone of the main connector A;

[0031] Figure 6 This is the unfolded diagram of the branch pipe B's shrimp bend;

[0032] Figure 7 Figure 1 shows the forming diagram of the branch pipe B's shrimp bend. Figure 2 shows a schematic diagram of a straight cylinder with cutting lines, and Figure 3 shows the forming diagram of assembly and welding.

[0033] Figure 8 This is the unfolded diagram of the oblique insertion of branch pipe C;

[0034] Figure 9 A schematic diagram of the inverted installation of the cactus receptacle;

[0035] Figure 10 This is a three-dimensional structural diagram of the shrimp bending cutting / welding device in Embodiment 2 of the present invention;

[0036] Figure 11 for Figure 10 Longitudinal sectional view of the shrimp bending / welding device;

[0037] Figure 12 for Figure 11 Enlarged structural diagram of region A in the middle;

[0038] Figure 13 for Figure 11 Enlarged structural diagram of region B in the middle;

[0039] Figure 14 This is a longitudinal sectional view of the shrimp bending cutting / welding device in Embodiment 3 of the present invention;

[0040] Figure 15 This is a schematic diagram showing the application state of the shrimp bending cutting / welding device in Embodiment 2 of the present invention.

[0041] Figure label:

[0042] 1. Fixed cylinder; 11. First annular groove; 12. Second annular groove; 13. Notch; 2. First moving rod; 3. First processing head; 4. Rotating ring; 5. Gear; 6. Motor; 7. Second moving rod; 8. Second limiting block; 9. Second processing head; 10. First limiting block; 20. Electric telescopic rod. Detailed Implementation

[0043] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be given below with reference to the accompanying drawings, which illustrate several embodiments of the present invention. However, the present invention can be implemented in different forms and is not limited to the embodiments described in the text. Rather, these embodiments are provided to make the disclosure of the present invention more thorough and complete.

[0044] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly associated with those skilled in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0046] Example 1: A method for manufacturing a large cactus tube, comprising the following steps:

[0047] S1. Cactus take-off simulation modeling:

[0048] The main pipe of the cactus-shaped connecting pipe has specifications of DN1730 / DN2692*34, and the branch pipe specifications are DN1860*25 and DN906*32. The main and branch pipes are connected intersectingly. The layout was created using Rhino software and CAD. Figure 2 and Figure 3 As shown.

[0049] S2. Laying out and manufacturing of main pipe A:

[0050] The main pipe A not only involves the layout of the cone, but also requires consideration of whether the opening size on the cone matches the angled insertion tube, including whether it affects the rolling of the cone. Directly opening the hole during blanking saves the subsequent hole-opening and marking process, reducing the manufacturing cycle.

[0051] (1) First, confirm the diameter, thickness and height of the middle cone of the main pipe A. Lay out the cone based on the cone's middle diameter. The unfolded shape should be a fan shape. The arc length of the small arc of the fan shape is equal to the circumference of the cone's small diameter. The arc length of the large arc of the fan shape is equal to the circumference of the cone's large diameter. The side length of the fan shape should be equal to the length of the cone's hypotenuse. Based on the dimensions of the unfolded cone and the conventional dimensions of the steel plate, confirm the number of longitudinal and circumferential seams of the cone.

[0052] (2) Next, confirm the pipe diameter, oblique insertion angle, and relative positions of branch pipes B and C when they are connected to the intermediate cone of the main pipe A by the oblique insertion pipes B and C. Then, confirm the size of the flat plate opening of the intermediate cone by layout. The unfolded diagram of the intermediate cone is shown below. Figure 4 As shown.

[0053] (3) Using the method of manufacturing complex intersecting line pipe joints, each branch pipe on the joint is unfolded. Taking the intersection of the inner and outer walls of the branch pipe as the reference point, the inner and outer wall lines of the pipe joint are selected. The inner wall line is selected in the toe area and the outer wall line is selected in the root area to obtain the shape of the pipe joint. Taking the lowest point of the pipe joint as the starting point, the steel plate is divided into N equal parts to cut the pipe joint.

[0054] (4) When cutting the material, the sector plate is cut according to the given dimensions. However, due to the large openings in branch pipes B and C, uneven stress during the rolling process easily leads to straight edges, which are difficult to eliminate. Therefore, as Figure 5 As shown, the openings of branch pipes B and C require reserved cutting points with a length of 100mm. Each opening should have at least 6 cutting points. After the cone is rounded, the reserved cutting points will be removed.

[0055] (5) Fabricate the intermediate cone, upper cone, upper connecting pipe, and lower connecting pipe separately, then weld each part together and connect a flange to complete the fabrication of the main connecting pipe A. The equipment flange of the main connecting pipe A is made of S31008 material. Assemble the flange of pipe A, the corresponding connecting pipe, and the cone (S31008 part), and fix them by spot welding. The misalignment meets the relevant standard requirements. Use E310-15 welding rods for welding, and perform non-destructive testing after welding. Assemble the cone of the S31008 part with the intermediate cone (material Q345R), and the misalignment meets the standard requirements. Use ENi6152 welding material.

[0056] S3. Laying out and manufacturing of branch pipes B and C:

[0057] (1) Manufacturing of shrimp-shaped bends

[0058] The bend in branch pipe B is formed by cutting straight pipes. Based on the center-to-diameter distance of the bend and the angle of each bend segment, a layout is performed to confirm the straight pipe length and intersection line dimensions. The unfolded diagram of the bend is shown below. Figure 6As shown. When cutting the shrimp bend, the intersection line should be cut with a dotted line, and 50mm should be left uncut at both ends to prevent the ends from being cut and unable to close during the rolling process.

[0059] Roll the dough according to the shrimp-shaped bend pattern, forming a straight cylinder. Cut along the intersection line at the designated cutting point, and grind the beveled edges at the assembly points. No further layout is needed; proceed directly according to... Figure 7 The shrimp can be bent into shape and then assembled and welded. During the welding process, a support plate is required around the weld to prevent welding deformation.

[0060] (2) Laying out the oblique insertion tube

[0061] The intermediate cones of branch pipes B and C and main pipe A are constructed using an oblique insertion method. The cutting dimensions are determined by laying out the oblique insertion pipe based on its diameter and angle. The unfolded diagram of branch pipe C is shown below. Figure 8 As shown.

[0062] When cutting the obliquely inserted tube, dotted line cutting should be used on the intersection line side; otherwise, rolling cannot be performed. After rolling and welding are completed, the excess material at the intersection line should be removed.

[0063] (3) Assembly of branch pipes B and C

[0064] Fabricate the shrimp-shaped bend, cone, central connecting pipe, and oblique insert separately, then weld all parts together and connect a flange to complete the fabrication of branch pipe B. Similarly, fabricate the cone, central connecting pipe, and oblique insert separately, then weld all parts together and connect a flange to complete the fabrication of branch pipe C. Assemble the transition section (cone) of SA387 GR.11.CL.2 with the corresponding flanges at the ends of branch pipes B and C by tack welding. Preheat the weld before welding; the preheating temperature must not be lower than 95℃. After welding, perform overall heat treatment on the transition section and flanges. After heat treatment, machine the flange sealing surface to the dimensions required by the drawing. Assemble the subsequent connecting pipes and shrimp-shaped bends according to the drawing requirements.

[0065] S4, Cactus-shaped connector formed:

[0066] (1) First, confirm the dimensions of the ABC pipe flanges and make corresponding pipe assembly fixtures according to the dimensions. The fixtures have 6 bolt holes evenly distributed on them.

[0067] (2) Confirm the installation position of the pipe assembly tooling according to the relative position of the ABC pipe flanges, and spot weld the tooling to the assembly platform. The installation angle of the branch pipe C pipe assembly tooling should be consistent with the C pipe flange. Measure the distance, angle, flatness and tolerance requirements between each tooling.

[0068] (3) such as Figure 9As shown, the inverted installation method is adopted. The main pipe A flange is inserted upside down onto the fixture by a crane, and the flange is fixed to the fixture with bolts and leveled.

[0069] (4) Insert branch pipes B and C upside down onto the corresponding fixtures using a crane. Use the fixtures to assemble the oblique insertion areas of branch pipes B and C with the central cone opening area of ​​the main pipe A. At the same time, fix the branch pipes on the fixtures and weld the pipe ends to ensure the relative center distance of the three flanges of the cactus (the center distance from pipe A to pipe C is 3300±3, and the center distance from pipe A to pipe B is 3600±3) and the 30° tilt angle of the flange face of pipe C.

[0070] Example 2: The difference between this example and Example 1 is that:

[0071] In the manufacturing process of shrimp-shaped bends, the following steps are used: Figure 10 The device shown enables the cutting and welding of cylindrical bodies. Please refer carefully to the attached diagram. Figures 10-13 The specific structure of the shrimp bending cutting / welding device includes:

[0072] A fixed cylinder 1 has a first annular groove 11 and a second annular groove 12 on its inner surface, which are respectively corresponding to two intersecting lines on the straight cylinder. The first annular groove 11 and the second annular groove 12 are symmetrically arranged. Notches 13 are provided on both opposite sides of the fixed cylinder 1.

[0073] The rotating ring 4 is rotatably mounted on the inner surface of the fixed cylinder 1, and the rotating ring 4 is coaxially arranged with the fixed cylinder 1; the outer ring surface of the rotating ring 4 is provided with a toothed ring, and part of the toothed ring can be seen through the notch 13.

[0074] The connecting rods, including a first moving rod 2 and a second moving rod 7, are slidably connected to the rotating ring 4. The first moving rod 2 and the second moving rod 7 are located on two opposite sides of the rotating ring 4, and the moving directions of the first moving rod 2 and the second moving rod 7 are parallel to the axis of the fixed cylinder 1. A first limiting block 10 extending into the first annular groove 11 is installed on the first moving rod 2, and a second limiting block 8 located in the second annular groove 12 is detachably installed on the second moving rod 7.

[0075] The processing head includes a first processing head 3 and a second processing head 9, which are detachably mounted on the first moving rod 2 and the second moving rod 7, respectively; the processing head uses cutting tools and welding tools (welding guns, etc.).

[0076] The drive mechanism, located on the outside of the fixed cylinder 1, includes a gear 5 driven by a motor 6, which meshes with a gear ring on the rotating ring 4 at the notch 13.

[0077] During application, when cutting, the first processing head 3 and the second processing head 9 use cutting tools to hoist the rolled straight cylinder to the inside of the fixed cylinder 1, and arrange the two coaxially. Figure 15 As shown in (a). After supporting the cylindrical body, the rotating ring 4 is driven to rotate, and the first moving rod 2 and the second moving rod 7 rotate accordingly. Under the limiting effect of the first annular groove 11 on the first limiting block 10 and the limiting effect of the second annular groove 12 on the second limiting block 8, the moving trajectory of the first processing head 3 conforms to the shape of the first annular groove 11, and the moving trajectory of the second processing head 9 conforms to the shape of the second annular groove 12, thereby realizing the synchronous cutting of the two intersecting lines on the cylindrical body.

[0078] During welding, the first processing head 3 and the second processing head 9 use welding tools to keep the middle section of the straight cylinder stationary while changing the shape of the upper and lower sections, such as... Figure 15 As shown in (b). After supporting the straight cylinder, start the device and operate as above to simultaneously weld the three sections of the shrimp bend, thus completing the forming of the shrimp bend.

[0079] Everything else is the same as in Example 1.

[0080] Example 3: The difference between this example and Example 2 is that:

[0081] like Figure 14 As shown, the mounting ends of the first processing head 3 and the second processing head 9 are both connected to an electric telescopic rod 20. The electric telescopic rod 20 is used to drive the corresponding processing head to move along the slope of the corresponding annular groove to adapt to straight cylinders of different diameters.

[0082] The rest is the same as in Example 2.

[0083] The present invention has been described by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. A method of making a form for a large cactus graft, characterized by: Comprise the following steps: S1, cactus takeover simulation modeling: modeling and unfolding patterns using computer software; S2, main takeover A lofting and manufacturing: for the intermediate cone, lofting first to get the fan-shaped development map, then confirm the location and hole size of the intermediate cone to be opened, and leave a point when blanking, and reserve at least 6 cutting points for each opening part, and after the conical body is completed, the reserved cutting points are removed, and the production of the intermediate cone is completed; S3, lofting and manufacturing of branch pipes B and C: shrimp bend of branch pipe B is made by cutting straight pipe, first according to the center distance diameter of shrimp bend and the angle of each shrimp bend, lofting is carried out, the length of straight pipe and the size of intersection line are confirmed, and the shrimp bend unfolding map is obtained; Then, when the shrimp bend is blanked, the intersection line requires point cutting, and the two end parts are not cut to prevent the two end parts from being cut and unable to be connected during the rolling process; After blanking, rolling is carried out, the rolling shape is a straight cylinder, the cutting line is cut at the reserved point according to the intersection line, and the end face bevel of the to-be-assembled part is polished; Finally, directly assemble and weld according to the shrimp bend forming drawing, that is, the production of shrimp bend is completed; In step S3, the straight cylinder is cut and welded by a shrimp bend cutting / welding device, and the structure of the shrimp bend cutting / welding device is: it comprises a fixed cylinder (1), a first annular groove (11) and a second annular groove (12) are formed on the inner surface of the fixed cylinder (1), the first annular groove (11) and the second annular groove (12) correspond to two intersection lines on the straight cylinder respectively, a rotating ring (4) which can rotate and is coaxial with the fixed cylinder (1) is clamped on the inner surface of the fixed cylinder (1), a first moving rod (2) and a second moving rod (7) are slidably connected to the rotating ring (4), a first machining head (3) and a first limiting block (10) extending into the first annular groove (11) are installed on the first moving rod (2), and a second machining head (9) and a second limiting block (8) located in the second annular groove (12) are detachably installed on the second moving rod (7); The fixed cylinder (1) is also provided with a driving mechanism for driving the rotating ring (4) to rotate; When cutting, the first machining head (3) and the second machining head (9) adopt cutting tools, after the rotating ring (4) is driven to rotate, the first moving rod (2) and the second moving rod (7) rotate, under the limiting action of the first limiting block (10) in the first annular groove (11) and the second limiting block (8) in the second annular groove (12), the moving track of the first machining head (3) conforms to the shape of the first annular groove (11), and the moving track of the second machining head (9) conforms to the shape of the second annular groove (12), so that the cutting of the two intersection lines on the straight cylinder is realized simultaneously; When welding, the first machining head (3) and the second machining head (9) adopt welding tools, the middle section of the straight cylinder is kept stationary, the shapes of the upper and lower sections are changed, and then the device is started to realize the welding of the three sections of the shrimp bend simultaneously, that is, the forming of the shrimp bend is completed. S4, cactus takeover forming: using the inverted method, the main pipe A flange mouth downward, with bolts to fix the flange on the tool and find the level, using the tool to group the branch pipe B, C oblique pipe and main pipe A intermediate cone hole area, at the same time, the branch pipe is fixed on the tool to carry out the pipe orifice intersection line welding, to ensure the relative center distance size of the three flanges of the cactus and the 30° inclination angle of the branch pipe C flange, that is, the production of large cactus takeover is completed.

2. The method of claim 1, wherein: In step S1, the rhinoceros software and CAD are used for unfolding and layout.

3. The method of claim 1, wherein: In step S2, for the flat plate hole contour of the intermediate cone, the manufacturing method of complex intersection line takeover node is used to determine, the branch takeover on the node is unfolded, the intersection point of the inner wall and the outer wall of the branch takeover is taken as the reference point, the inner wall line and the outer wall line of the hole are selected, the inner wall line is selected in the toe area, and the outer wall line is selected in the root area, to obtain the hole shape; taking the lowest point of the hole as the starting point, N equally divides the steel plate, and the hole is cut.

4. The method of claim 1, wherein: In step S3, for the oblique pipe, the layout is confirmed according to the diameter and angle of the oblique pipe; when the oblique pipe is cut, the point line is used on the intersection line side; after the rolling and welding are completed, the excess material at the intersection line is cut off.

5. The method of claim 1, wherein: In step S4, the installation direction of the pipe orifice group tooling is confirmed according to the relative position of the ABC pipe orifice flange, and the tooling is spot welded and fixed on the group platform, wherein the installation angle of the branch pipe C pipe orifice group tooling is consistent with the C pipe orifice flange.

6. The method of claim 1, wherein: The first moving rod (2) and the second moving rod (7) are respectively located at two opposite sides of the rotating ring (4), and the moving directions of the first moving rod (2) and the second moving rod (7) are parallel to the axis of the fixed cylinder (1).

7. The method of claim 1, wherein: The driving mechanism comprises a gear ring arranged on the outer ring surface of the rotating ring (4) and a gear (5) driven by a motor (6), and the fixed cylinder (1) is provided with a notch (13) exposing the gear ring, and the gear (5) is engaged with the gear ring at the notch (13).

8. The method of claim 1, wherein: The mounting end of the first machining head (3) and the second machining head (9) is connected with an electric telescopic rod (20), and the electric telescopic rod (20) is used for driving the corresponding machining head to move along the slope where the corresponding annular groove is located, so as to adapt to different pipe diameters of straight cylinders.

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