Flange and pipe splicing positioning device and splicing method

Abstract

This application provides a positioning device and method for splicing flanges and pipes. The positioning device comprises a main shaft with a gripping portion at one end. A handle is sleeved onto the main shaft via a first through-hole in the center, forming a sliding fit. A magnetic bracket is sleeved onto the main shaft via a second through-hole in the center and secured below the handle. The magnetic bracket has at least two elongated holes evenly distributed around the circumference of the second through-hole, extending in the direction of the diameter of the second through-hole. The positioning structure comprises a slider, a threaded rod, and a spacer. A slidable slider is mounted within each elongated hole. The slider has threaded holes extending vertically through the center and into which a threaded rod is mounted. The lower end of the threaded rod is fixedly connected to a spacer. Each connecting rod has a first end hinged to the handle and a second end hinged to a slider. A spring is sleeved on the main shaft between the handle and the magnetic bracket, applying a force to urge the handle toward the magnetic bracket. This application can control the insertion depth of the pipe into the flange, facilitating end-to-end distance positioning during splicing.

Description

Technical Field

[0001] The present application relates to the technical field of shipbuilding, and in particular to a flange and pipe splicing positioning device and a splicing method. Background Art

[0002] During shipbuilding, the quality of pipe section fabrication significantly impacts piping system installation and vibration characteristics. Pipeline layout is challenging within the confined space of a ship's cabin, making high-precision pipe fabrication a key research area. Pipe fabrication accuracy directly impacts pipeline sealing, installation stress, and noise levels, making improving pipe fabrication quality and precision crucial.

[0003] In addition to the impact of the pipe's own manufacturing accuracy, the assembly accuracy of the pipe and other components will also affect the quality of the entire piping system. Among them, the most common assembly structure is the welding of pipes and flat-weld flanges. When welding pipes and flat-weld flanges, in order to facilitate subsequent splicing of the pipeline and to ensure the stability of the current pipe-flange connection, there are requirements for the depth of the pipe inserted into the flange.

[0004] Typically, after a pipe is inserted into a flange, the distance between the pipe end face and the flange end face is required to be a predetermined distance greater than the pipe wall thickness. This predetermined distance is typically very small; for small-diameter pipes and flanges, it may be only around 5mm or even 1mm. However, in actual field operations, due to limited construction conditions, traditional tools such as rulers and tape measures are the only means of measurement. On the one hand, manual adjustment of distances after traditional measurement results in significant errors. On the other hand, even if the measured dimensions are accurate, maintaining the relative position of the pipe and flange manually makes it difficult to maintain this minute end-to-end distance for an extended period. Therefore, the relative position of the pipe and flange may further shift before welding, increasing the margin of error.

[0005] When each pipe is connected to its corresponding flange, due to the tolerance range during pipe processing and the flange being able to fit into the pipe and rotate, the flange aperture is generally larger than the outer diameter of the pipe, resulting in more or less errors in the connection between each pipe and each flange. At the very least, this will affect the installation of the pipe and require rework of the pipe and flange. At worst, the accumulated errors may affect the permeability of the entire piping system, resulting in structural instability of the entire piping system, which may be damaged in the later stage and cause system paralysis, bringing unpredictable risks. Summary of the Invention

[0006] The purpose of the embodiments of the present application is to provide a flange and pipe splicing positioning device and a splicing method, which can control the depth of the pipe inserted into the flange, conveniently realize the end face distance positioning when the two are spliced, and in a further scheme, the coaxiality adjustment of the two can also be achieved through the centering structure of the flange and pipe splicing positioning device.

[0007] In a first aspect, a flange and pipe splicing positioning device is provided, comprising a main shaft, a magnetic support, a positioning structure, a connecting rod, and a spring. The main shaft has a gripping portion at one end, a handle having a first through-hole in the middle, and the handle is slidably mounted on the main shaft through the first through-hole. A second through-hole is disposed in the middle of the magnetic support, and the magnetic support is secured to the main shaft through the second through-hole, with the handle positioned between the magnetic support and the gripping portion. The magnetic support has at least two elongated holes, evenly distributed around the circumference of the second through-hole, with each elongated hole extending parallel to the diameter of the second through-hole. The positioning structure comprises a slider, a threaded rod, and a spacer. A slidable slider is mounted in each elongated hole, with a threaded hole in the middle of the slider that mates with the threaded rod. A threaded rod is mounted in each threaded hole of the slider, with both ends of the threaded rod extending beyond the ends of the threaded hole. The end of the threaded rod distal to the handle is fixedly connected to a spacer. The threaded rod is rotated to adjust the distance between the spacer and the bottom surface of the magnetic support. The connecting rod includes a first end and a second end. Each slider is connected to the handle via a connecting rod. The first end of each connecting rod is hinged to the handle, and the second end of the same connecting rod is hinged to the slider. The first end of each connecting rod is closer to the main shaft than the second end. A spring is mounted on the main shaft and located between the handle and the magnetic bracket. The two ends of the spring are connected to the handle and the magnetic bracket, respectively, and the spring applies a force to the handle toward the magnetic bracket.

[0008] In an implementable solution, the positioning structure also includes a knob, and one end of the threaded rod near the handle is fixedly connected to a knob. The knob is provided with scale lines distributed around a circle, and the slider is provided with a marker aligned with the scale lines. The scale value corresponding to the alignment of the scale lines and the marker is used to indicate the distance between the lower surface of the pad and the lower surface of the magnetic bracket.

[0009] In one feasible solution, the spacer is cylindrical.

[0010] In an implementable solution, the overall shape of the magnetic bracket is a cross-shaped structure, a second through hole is provided at the center of the cross-shaped structure, and the cross-shaped structure includes four extension arms, and each extension arm is provided with a long hole.

[0011] In one feasible solution, an internal thread is provided in the second through hole of the magnetic bracket, and an external thread is provided on the end of the main shaft opposite to the grip portion, so that the second through hole of the magnetic bracket and the end of the main shaft with the external thread form a threaded fit.

[0012] In one feasible solution, the flange and pipe splicing positioning device further includes a centering structure, which includes:

[0013] At least two flexible track bars, all of which are arranged in parallel;

[0014] At least three strip pads, each strip pad including a first end and a second end, the first ends of all the strip pads being configured to have a wedge-shaped portion, and the second ends being mounting portions provided with via holes spaced a predetermined distance apart; parallel flexible track strips passing through the via holes on the mounting portions of all the strip pads, connecting all the strip pads in series;

[0015] The wedge-shaped portion includes an inclined surface and a flat surface relative to the mounting portion. After each flexible track strip is bent into a circular ring shape consistent with the outer diameter of the tube, the inclined surfaces of the wedge-shaped portions of all strip pads face outward.

[0016] In one feasible solution, all the strip-shaped pads are evenly distributed along the annular circumference formed by the flexible track strip.

[0017] In one feasible solution, the through hole on the mounting portion of the strip pad is clearance-matched with the flexible track bar.

[0018] In one feasible solution, in each strip pad, scale lines are drawn on the inclined surface of the wedge portion and the surface adjacent to the inclined surface, and the scale lines on the inclined surface are used to mark the thickness of the wedge portion at the current scale line position.

[0019] According to a second aspect of the present application, a method for splicing a flange and a pipe is further provided. After the pipe is inserted into the flange, the distance between the end face of the pipe and the end face of the flange is required to be B. The flange and pipe splicing positioning device of the aforementioned solution is used. The method for splicing the flange and the pipe comprises the following steps:

[0020] S1. Rotate the threaded rods of all positioning structures so that the lower surfaces of all pads are at a distance B from the lower surface of the magnetic bracket.

[0021] S2. Hold the gripping portion of the spindle and lift the handle toward the gripping portion, so that the sliders of the positioning structure move along the long hole toward the spindle, so that all the sliders can enter the flange;

[0022] S3. The lower surface of the magnetic bracket is adsorbed onto the end face of the flange. At the same time, the spacers of the positioning structure are all within the inner diameter of the flange.

[0023] S4. Slowly release the handle, causing it to move downward along the main shaft under the action of the spring, thereby causing the sliders of the positioning structure to move along the long hole away from the main shaft, and finally all the gaskets contact the inner wall of the flange;

[0024] S5. Insert the pipe into the flange and make the end face of the pipe fit in contact with the lower surface of the spacer. At this time, the distance between the end face of the pipe and the end face of the flange is equal to the distance B between the lower surface of the spacer and the lower surface of the magnetic support.

[0025] S6. Adjust the pipe so that the coaxiality between the pipe and the flange meets the requirements, and keep the end face of the pipe in contact with the lower surface of the gasket, and then spot weld the pipe and flange;

[0026] S7. After spot welding is completed, remove the flange and pipe splicing positioning device, then carry out subsequent welding work on the pipe and flange, and then complete the splicing operation of the two.

[0027] Compared with the prior art, the beneficial effects of this application include at least:

[0028] The flange-to-pipe splicing positioning device of this application adjusts the distance between the lower surface of the spacer block and the lower surface of the magnetic support by rotating a threaded rod. The spiral feed drives the linear displacement of the spacer block, improving the accuracy of distance adjustment. Furthermore, the spacer block serves as a stop for the pipe's insertion into the flange. Once the relative position between the spacer block and the magnetic support is determined, the distance between the pipe end face and the flange end face can also be determined. This makes it extremely convenient to locate the depth of the pipe insertion into the flange.

[0029] At the same time, after the magnetic bracket absorbs the flange, the gasket can be kept in the predetermined position in the flange without the help of manpower, thereby keeping the distance between the lower surface of the gasket and the lower surface of the magnetic bracket unchanged. As long as the pipe 200 fits with the lower surface of the gasket, the end face of the pipe can also always maintain a predetermined distance from the end face of the flange. It ensures that the pipe and the flange can maintain the required relative position before and during spot welding, improves the accuracy of controlling the distance between the end face of the pipe and the end face of the flange, and ensures the verticality of the end face of the pipe and the flange, thereby improving the end face positioning accuracy when the pipe and the flange are assembled.

[0030] Furthermore, because the slider of the positioning structure in the present invention can slide along the elongated hole, the pad can also move with the slider, allowing multiple pads to be inserted into flanges with different inner diameters. Therefore, the present invention is applicable to the end face positioning of flanges and pipes with different inner diameters, and has high versatility.

[0031] In the preferred solution, the present application includes a flange and pipe splicing positioning device with a centering structure, which can not only achieve high-precision positioning of the end faces of the pipe and the flange, but also achieve coaxiality adjustment of the pipe and the flange, thereby reducing the assembly error of the pipe and the flange, and relatively improving the assembly and installation accuracy of the entire pipeline system.

[0032] Since the spacing and coaxiality between the pipe end face and the flange end face can be guaranteed, the installation accuracy of the pipe and flange can be improved, thereby reducing the cumulative error, improving the stability of the subsequent entire piping system, reducing the possibility of damage in the later stage, and reducing unpredictable risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 1 is a three-dimensional structural diagram of a flange and pipe splicing and positioning device according to an embodiment of the present application;

[0035] Figure 2 Schematic diagram of the end face position of a flange and a pipe when spliced ​​according to an embodiment of the present application;

[0036] Figure 3 Schematic diagram of the side structure of a flange and pipe splicing and positioning device according to an embodiment of the present application;

[0037] Figure 4 Schematic diagram of the flange and pipe splicing positioning device in use according to an embodiment of the present application;

[0038] Figure 5 for Figure 4 A top view of the flange and pipe splicing positioning device;

[0039] Figure 6 for Figure 5 Cross-sectional view along AA;

[0040] Figure 7 Schematic diagram of the relative positions of the gasket, the pipe and the flange in the flange and pipe splicing positioning device according to an embodiment of the present application;

[0041] Figure 8 Schematic diagram of a centering structure of a flange and pipe splicing positioning device according to an embodiment of the present application;

[0042] Figure 9 Schematic diagram of the structure of a strip pad with a centering structure according to an embodiment of the present application;

[0043] Figure 10 Schematic diagram of the centering structure of the flange and pipe splicing positioning device in use according to an embodiment of the present application;

[0044] Figure 11 1 is a cross-sectional view of a flange and pipe splicing and positioning device with a centering structure according to an embodiment of the present application in use;

[0045] Figure 12 for Figure 11 A partial enlarged view of the M point in the middle.

[0046] In the figure: 10, main shaft; 11, gripping part; 20, handle part; 30, magnetic bracket; 31, long hole; 40, positioning structure; 41, slider; 42, threaded rod; 43, pad; 44, knob; 50, connecting rod; 60, spring; 70, centering structure; 71, flexible track bar; 72, strip pad; 721, wedge-shaped part; 722, mounting part; 100, flange; 200, pipe. DETAILED DESCRIPTION

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0048] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0049] like Figure 1 As shown, this embodiment first provides a flange and pipe splicing positioning device, including a main shaft 10, a handle portion 20, a magnetic bracket 30, a positioning structure 40, a connecting rod 50 and a spring 60.

[0050] The end of one end of the main shaft 10 is the gripping portion 11. A first through-hole is provided in the middle of the handle portion 20, and the handle portion 20 is sleeved on the main shaft 10 through the first through-hole to form a sliding fit. A second through-hole is provided in the middle of the magnetic bracket 30, and the magnetic bracket 30 is sleeved and fixed on the main shaft 10 through the second through-hole, with the handle portion 20 located between the magnetic bracket 30 and the gripping portion 11; at least two long holes 31 are provided on the magnetic bracket 30, and all the long holes 31 are evenly distributed around the circumference of the second through-hole, and the extension direction of each long hole 31 is parallel to the direction of the diameter of the second through-hole. The positioning structure 40 includes a slider 41, a threaded rod 42, and a spacer 43. A slidable slider 41 is installed in each elongated hole 31, and a threaded hole is provided in the middle of the slider 41 to cooperate with the threaded rod 42. A threaded rod 42 is installed in the threaded hole of each slider 41, with both ends of the threaded rod 42 extending beyond the ends of the threaded hole. The end of the threaded rod 42 away from the handle portion 20 is fixedly connected to a spacer 43. The threaded rod 42 is rotated to adjust the distance between the spacer 43 and the lower surface of the magnetic bracket 30. The connecting rod 50 includes a first end and a second end. Each slider 41 is connected to the handle portion 20 via a connecting rod 50. The first end of each connecting rod 50 is hinged to the handle portion 20, and the second end of the same connecting rod 50 is hinged to the slider 41. The first end of each connecting rod 50 is closer to the main shaft 10 than the second end. The spring 60 is sleeved on the main shaft 10 and is located between the handle 20 and the magnetic bracket 30, and the two ends of the spring 60 are respectively connected to the handle 20 and the magnetic bracket 30. The spring 60 applies a force to the handle 20 to move closer to the magnetic bracket 30.

[0051] like Figure 2 As shown, if the pipe 200 is inserted into the flange 100, the distance between the end face of the pipe 200 and the end face of the flange 100 is required to be B.

[0052] The flange and pipe splicing positioning device of the above embodiment is used for splicing the pipe and the flange. Figure 3 As shown, first rotate the threaded rods 42 of all the positioning structures 40 so that the lower surfaces of all the pads 43 are at a distance B from the lower surface of the magnetic support 30. Figures 4 to 7As shown, grip the grip portion 11 of the spindle 10 and lift the handle portion 20 toward the grip portion 11, causing the sliders 41 of the positioning structure 40 to move along the long hole 31 toward the spindle 10, allowing all sliders 41 to enter the flange 100. Then, the lower surface of the magnetic bracket 30 is adsorbed against the end surface of the flange 100. At this time, the pads 43 of the positioning structure 40 are all within the inner diameter of the flange 100. Slowly release the handle portion 20, allowing the handle portion 20 to move downward along the spindle 10 under the action of the spring 60, thereby causing the sliders 41 of the positioning structure 40 to move along the long hole 31 away from the spindle 10, and finally all the pads 43 contact the inner wall of the flange 100. Insert the pipe into flange 100 and ensure that the end face of pipe 200 is in contact with the lower surface of spacer 43. The distance between the end face of pipe 200 and the end face of flange 100 is equal to the distance B between the lower surface of spacer 43 and the lower surface of magnetic support 30. Adjust pipe 200 to ensure the required coaxiality with flange 100, and keep the end face of pipe 200 in contact with the lower surface of spacer 43. Then, spot weld pipe 200 and flange 100. After spot welding, remove the flange and pipe splicing positioning device, and then proceed with the subsequent welding of pipe and flange, completing the splicing operation.

[0053] In summary, the flange-to-tube splicing and positioning device of the aforementioned embodiment adjusts the distance between the lower surface of the spacer 43 and the lower surface of the magnetic support 30 by rotating the threaded rod 42. The spiral feed drives the linear displacement of the spacer 43, thereby improving the accuracy of the distance adjustment. Furthermore, the spacer 43 serves as a position limiter for the insertion of the tube 200 into the flange 100. Once the relative position between the spacer 43 and the magnetic support 30 is determined, the distance between the end face of the tube 200 and the end face of the flange 100 can be determined. This makes it very convenient to solve the problem of positioning the depth of the tube 200 inserted into the flange 100.

[0054] At the same time, after the magnetic bracket 30 adsorbs the flange 100, the gasket 43 can be kept at the predetermined position in the flange 100 without manpower, thereby keeping the distance between the lower surface of the gasket 43 and the lower surface of the magnetic bracket 30 unchanged. As long as the pipe 200 fits with the lower surface of the gasket 43, the end face of the pipe 200 can also always maintain a predetermined distance from the end face of the flange 100. This ensures that the pipe 200 and the flange 100 can maintain the required relative position before and during spot welding, improves the accuracy of controlling the distance between the end face of the pipe 200 and the end face of the flange 100, and ensures the verticality of the end face of the pipe 200 and the flange 100, thereby improving the end face positioning accuracy during assembly of the pipe 200 and the flange 100.

[0055] Furthermore, because the slider 41 of the positioning structure 40 in this embodiment can slide along the elongated hole 31, the spacer 43 can also move with the slider 41, thereby enabling multiple spacers 43 to be inserted into flanges with different inner diameters. Therefore, this embodiment is applicable to the end face positioning of flanges and pipes with different inner diameters, and has high versatility.

[0056] In this embodiment, the distance between the end face of the pipe and the end face of the flange can be guaranteed, thereby improving the installation accuracy of the pipe and the flange, thereby reducing cumulative errors, improving the stability of the subsequent entire pipeline system, reducing the possibility of damage in the later stage, and reducing unpredictable risks.

[0057] In this embodiment, if Figure 1 and Figure 3 As shown, the positioning structure 40 may further include a knob 44, and the end of the threaded rod 42 near the handle portion 20 is fixedly connected to the knob 44. The knob 44 is provided with scale lines distributed around the circumference, and the slider 41 is provided with a marker aligned with the scale lines. The scale value corresponding to the alignment of the scale lines and the marker is used to indicate the distance between the lower surface of the spacer 43 and the lower surface of the magnetic bracket 30.

[0058] In this embodiment, if Figure 7 As shown, all the spacers 43 are cylindrical with the same diameter, and the cylindrical outer wall is more easily fitted with the inner wall of the flange 100 .

[0059] In this embodiment, if Figure 1 、 Figure 4 and Figure 5 As shown, the overall shape of the magnetic support 30 can be a cross-shaped structure, with a second through hole disposed at the center of the cross-shaped structure. The cross-shaped structure includes four extension arms, each of which is provided with an elongated hole 31. The cross-shaped structure is relatively stable and also ensures that the magnetic support 30 and the end face of the flange 100 have a sufficient adsorption area, thereby improving the adsorption effect.

[0060] In this embodiment, an internal thread can be provided in the second through hole of the magnetic bracket 30, and an external thread is provided at the end of the main shaft 10 opposite to the holding portion 11. The second through hole of the magnetic bracket 30 and the end of the main shaft 10 with the external thread form a threaded fit to achieve convenient disassembly and assembly of the magnetic bracket 30 and the main shaft 10.

[0061] The technical solution of the aforementioned embodiment is mainly to locate the end face distance between the pipe 200 and the flange 100 when they are spliced. In addition, in some assembly scenarios, the requirement for the coaxiality of the pipe 200 and the flange 100 is also relatively high.

[0062] Therefore, in this embodiment, if Figure 8 and Figure 9As shown, the flange and pipe splicing and positioning device can also include a centering structure 70. The centering structure 70 includes at least two flexible track bars 71 and at least three strip pads 72. All flexible track bars 71 are arranged in parallel. Each strip pad 72 includes a first end and a second end. The first end of all strip pads is configured to have a wedge-shaped portion 721, and the second end is a mounting portion 722 provided with through holes spaced a predetermined distance apart. The parallel flexible track bars 71 pass through the through holes on the mounting portions 722 of all strip pads 72, connecting all strip pads 72 in series. The wedge-shaped portion 721 includes an inclined surface and a flat surface relative to the mounting portion 722. After each flexible track bar 71 is bent into a circular ring shape consistent with the outer diameter of the pipe, the inclined surfaces of the wedge-shaped portions 721 of all strip pads 72 are facing outward.

[0063] Specifically, if Figure 10 、 Figure 11 and Figure 12 As shown, when aligning the pipe 200 and the flange 100, the centering structure 70 is attached to the pipe, and the flexible track strip 71 is bent into a ring shape around the pipe 200. The flat side of the wedge-shaped portion 721 of the strip gasket 72 is in contact with the outer wall of the pipe 200. The wedge-shaped portion 721 of the strip gasket 72 is inserted into the gap between the pipe 200 and the flange 100 until the inclined surface of the wedge-shaped portion 721 of the strip gasket 72 contacts the inner edge of the flange 100. The side of the wedge-shaped portion 721 inserted is the side opposite the end face of the flange 100. The wedge-shaped portion 721 of each strip gasket 72 is inserted into the gap between the pipe 200 and the flange 100 to the same depth, thereby ensuring that the coaxiality of the pipe 200 and the flange 100 meets the requirements, and the concentricity of the center of the end face of the pipe 200 and the center of the end face of the flange 100 also meet the requirements. The pipe 200 is further rotated to adjust the depth of the pipe 200 inserted into the flange 100 so that the end surface of the pipe 200 maintains contact with the lower surface of the pad 43, and finally the pipe and the flange are spot welded.

[0064] In summary, see Figure 11 and Figure 12 As shown, the flange and pipe splicing positioning device including the centering structure 70 of this embodiment can not only achieve high-precision positioning of the end faces of the pipe 200 and the flange 100, but also achieve coaxiality adjustment of the pipe 200 and the flange 100, thereby reducing the assembly error of the pipe and the flange and relatively improving the assembly and installation accuracy of the entire pipeline system.

[0065] It should be noted that the flexible track bar 71 can be made of magnetic soft material or nylon Velcro material, which is easy to fix and disassemble and can be recycled.

[0066] In this embodiment, if Figure 10 As shown, all strip pads 72 are preferably evenly distributed along the annular circumference formed by the flexible track strip 71.

[0067] In this embodiment, the through hole on the mounting portion 722 of the strip pad 72 can be loosely matched with the flexible track bar 71 , so that the position of the strip pad 72 can be adjusted along the flexible track bar 71 .

[0068] In this embodiment, each strip-shaped pad 72 may have scale lines on the inclined surface of its wedge-shaped portion 721 or on a surface adjacent to the inclined surface. The scale lines on the inclined surface indicate the thickness of the wedge-shaped portion 721 at the current scale line position. When the wedge-shaped portion 721 is inserted into the gap between the pipe 200 and the flange 100, the edge of the flange 100 will align with the scale lines on the inclined surface of the wedge-shaped portion 721. At this point, reading the scale line value allows the operator to obtain data on the gap between the pipe and the flange.

[0069] This embodiment also provides a flange and pipe splicing method, which uses the flange and pipe splicing positioning device in the aforementioned solution. After the pipe 200 is inserted into the flange 100, the distance between the end face of the pipe 200 and the end face of the flange 100 is required to be B.

[0070] Combine Figure 11 and Figure 12 , describes the flange and pipe splicing method. The flange and pipe splicing method includes the following steps:

[0071] S1. Rotate the threaded rods 42 of all the positioning structures 40 so that the lower surfaces of all the pads 43 are at a distance B from the lower surface of the magnetic support 30.

[0072] S2. Grip the grip portion 11 of the spindle 10 and lift the handle portion 20 toward the grip portion 11, so that the sliders 41 of the positioning structure 40 all move along the long hole 31 toward the spindle 10, so that all the sliders 41 can enter the flange 100;

[0073] S3. The lower surface of the magnetic support 30 is adsorbed onto the end surface of the flange. At the same time, the pads 43 of the positioning structure 40 are all within the inner diameter of the flange 100.

[0074] S4. Slowly release the handle 20, causing it to move downward along the main shaft 10 under the action of the spring 60, thereby causing the sliders 41 of the positioning structure 40 to move along the long hole 31 away from the main shaft 10, and finally all the pads 43 contact the inner wall of the flange 100;

[0075] S5. Insert the tube 200 into the flange 100 so that the end face of the tube 200 is in contact with the lower surface of the spacer 43. At this time, the distance between the end face of the tube 200 and the end face of the flange 100 is equal to the distance B between the lower surface of the spacer 43 and the lower surface of the magnetic support 30.

[0076] S6. Adjust the pipe 200 so that the coaxiality between the pipe 200 and the flange 100 meets the requirements, and keep the end face of the pipe 200 in contact with the lower surface of the spacer 43, and then spot weld the pipe 200 and the flange 100;

[0077] S7. After the spot welding is completed, the flange and pipe splicing positioning device is removed, and then the subsequent welding work of the pipe 200 and the flange 100 is carried out, and then the splicing operation of the two is completed.

[0078] Furthermore, step S6 includes the following steps:

[0079] S61, attaching the centering structure 70 to the tube 200, and bending the flexible track strip 71 into a ring shape around the tube 200; wherein, the flat side of the wedge-shaped portion 721 of the strip pad 72 is in contact with the outer wall of the tube 200;

[0080] S62. Insert the wedge-shaped portion 721 of the strip gasket 72 into the gap between the pipe 200 and the flange 100 until the inclined surface of the wedge-shaped portion 721 of the strip gasket 72 contacts the inner edge of the flange 100. The side of the wedge-shaped portion 721 inserted is the side opposite to the end face of the flange 100. The wedge-shaped portion 721 of each strip gasket 72 is inserted into the gap between the pipe 200 and the flange 100 to the same depth.

[0081] S63, rotating the pipe 200 to adjust the depth of the pipe 200 inserted into the flange 100, so that the end surface of the pipe 200 maintains contact with the lower surface of the spacer 43;

[0082] S64. Spot-weld the pipe 200 and the flange 100.

[0083] In step S7, disassembling the flange-to-pipe joint positioning device includes the following steps: lifting the handle 20 toward the grip 11, causing the sliders 41 of the positioning structure 40 to move along the elongated hole 31 toward the main shaft 10, and then pulling the magnetic bracket 30 away from the end face of the flange 100. Next, withdrawing the wedge-shaped portion 721 of the strip pad 72 of the centering structure 70 from the gap between the flange 100 and the pipe 200, restoring the flexible track strip 71 from its circular shape to a flat state, and removing the centering structure 70. This completes the removal of the flange-to-pipe joint positioning device.

[0084] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A flange and pipe splicing positioning device, characterized in that: include: A main shaft (10), one end of which is a gripping portion (11); A handle portion (20) is provided with a first through hole in the middle thereof, and the handle portion (20) is sleeved on the main shaft (10) through the first through hole to form a sliding fit; A magnetic bracket (30) is provided with a second through hole in the middle thereof, the magnetic bracket (30) is sleeved on the main shaft (10) and fixed through the second through hole, and the handle portion (20) is located between the magnetic bracket (30) and the grip portion (11); at least two long holes (31) are provided on the magnetic bracket (30), all of the long holes (31) are evenly distributed around the circumference of the second through hole, and the extension direction of each long hole (31) is parallel to the direction of the diameter of the second through hole; A positioning structure (40) comprises a slider (41), a threaded rod (42) and a pad (43), wherein a slidable slider (41) is installed in each long hole (31), and a threaded hole is provided in the middle of the slider (41) to cooperate with the threaded rod (42); a threaded rod (42) is installed in the threaded hole of each slider (41), and both ends of the threaded rod (42) extend beyond both ends of the threaded hole. An end of the threaded rod (42) away from the handle portion (20) is fixedly connected to a pad (43), and the threaded rod (42) is rotated to adjust the distance between the pad (43) and the lower surface of the magnetic bracket (30); a connecting rod (50) comprising a first end and a second end, wherein each slider (41) is connected to the handle portion (20) via a connecting rod (50); the first end of each connecting rod (50) is hinged to the handle portion (20), and the second end of the same connecting rod (50) is hinged to the slider (41), and the first end of each connecting rod (50) is closer to the main shaft (10) than the second end; A spring (60) is sleeved on the main shaft (10) and is located between the handle portion (20) and the magnetic bracket (30), and two ends of the spring (60) are respectively connected to the handle portion (20) and the magnetic bracket (30), and the spring (60) applies a force to the handle portion (20) to move closer to the magnetic bracket (30).

2. The flange and pipe splicing positioning device according to claim 1, characterized in that: The positioning structure (40) also includes a knob (44), and one end of the threaded rod (42) close to the handle portion (20) is fixedly connected to the knob (44), and the knob (44) is provided with scale lines distributed around a circumference, and the slider (41) is provided with a marker aligned with the scale lines. The scale value corresponding to the alignment of the scale lines and the marker is used to mark the distance between the lower surface of the pad (43) and the lower surface of the magnetic bracket (30).

3. The flange and pipe splicing positioning device according to claim 1, characterized in that: The cushion block (43) is cylindrical.

4. The flange and pipe splicing positioning device according to claim 1, characterized in that: The overall shape of the magnetic bracket (30) is a cross-shaped structure, the second through hole is provided at the center of the cross-shaped structure, the cross-shaped structure includes four extension arms, and the long hole (31) is provided on each extension arm.

5. The flange and pipe splicing positioning device according to claim 1, characterized in that: The second through hole of the magnetic bracket (30) is provided with an internal thread, and the end of the main shaft (10) opposite to the holding portion (11) is provided with an external thread, and the second through hole of the magnetic bracket (30) and the end of the main shaft (10) with the external thread form a threaded fit.

6. The flange and pipe splicing positioning device according to any one of claims 1 to 5, characterized in that: The flange and pipe splicing positioning device further comprises a centering structure (70), wherein the centering structure (70) comprises: At least two flexible track bars (71), all of the flexible track bars (71) are arranged in parallel; At least three strip pads (72), each of the strip pads (72) comprising a first end and a second end, the first ends of all the strip pads (72) being configured to have a wedge-shaped portion (721), and the second ends being a mounting portion (722) provided with through holes spaced at a predetermined distance; the parallel flexible track strips (71) passing through the through holes on the mounting portions (722) of all the strip pads (72), connecting all the strip pads (72) in series; The wedge-shaped portion (721) includes an inclined surface and a flat surface relative to the mounting portion (722), and after each flexible track strip (71) is bent into a circular ring shape consistent with the outer diameter of the tube, the inclined surfaces of the wedge-shaped portions (721) of all the strip pads (72) face outward.

7. The flange and pipe splicing positioning device according to claim 6, characterized in that: All the strip-shaped pads (72) are evenly distributed along the annular circumference formed by the flexible track strip (71).

8. The flange and pipe splicing positioning device according to claim 6, characterized in that: The through hole on the mounting portion (722) of the strip-shaped pad (72) is clearance-matched with the flexible track bar (71).

9. The flange and pipe splicing positioning device according to claim 6, characterized in that: In each of the strip-shaped pads (72), scale lines are drawn on the inclined surface of the wedge-shaped portion (721) and the surface adjacent to the inclined surface, and the scale lines on the inclined surface are used to mark the thickness of the wedge-shaped portion (721) at the current scale line position.

10. A method for splicing a flange and a pipe, wherein after the pipe is inserted into the flange, the distance between the end face of the pipe and the end face of the flange is required to be B, characterized in that: Using the flange and pipe splicing positioning device according to any one of claims 1 to 9, the flange and pipe splicing method includes the following steps: S1. Rotate the threaded rods (42) of all the positioning structures (40) so that the lower surfaces of all the pads (43) are at a distance B from the lower surface of the magnetic bracket (30); S2. Grip the gripping portion (11) of the main shaft (10), and lift the handle portion (20) toward the gripping portion (11), so that the sliders (41) of the positioning structure (40) all move along the long hole (31) toward the main shaft (10), so that all the sliders (41) can enter the flange; S3, the lower surface of the magnetic support (30) is adsorbed onto the end surface of the flange, and at the same time, the pads (43) of the positioning structure (40) are all within the inner diameter of the flange; S4, slowly releasing the handle (20), so that the handle (20) moves downward along the main shaft (10) under the action of the spring (60), thereby causing the sliders (41) of the positioning structure (40) to move along the long hole (31) in a direction away from the main shaft (10), and finally all the pads (43) contact the inner wall of the flange; S5. Insert the pipe into the flange and make the end face of the pipe fit in contact with the lower surface of the spacer (43). At this time, the distance between the end face of the pipe and the end face of the flange is equal to the distance B between the lower surface of the spacer (43) and the lower surface of the magnetic bracket (30); S6. Adjust the pipe so that the coaxiality between the pipe and the flange meets the requirements, and keep the end face of the pipe in contact with the lower surface of the gasket, and then spot weld the pipe and flange; S7. After spot welding is completed, remove the flange and pipe splicing positioning device, then carry out subsequent welding work on the pipe and flange, and then complete the splicing operation of the two.

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