Modular plumbing assembly

Abstract

The utility model discloses a modularization pipeline combined type device relates to air conditioning unit technical field is equipped with steam separation positioning structure, positioning mouth group, air inlet pipe, air outlet pipe and positioning box structure, steam separation positioning structure, a pair of positioning box structure, air inlet pipe structure and air outlet pipe are respectively corresponding to the U type pipe of steam -liquid separator, air suction pipe subassembly's U type pipe, air suction pipe subassembly's air suction pipe and air exhaust pipe subassembly's air exhaust pipe arrangement, and with welding frame mounting fixed. The utility model takes welding frame as the positioning foundation, and through the steam separation positioning structure, positioning mouth group, air inlet pipe structure, air outlet pipe and positioning of allocation, realizes the positioning of steam -liquid separator, four -way valve subassembly, air suction pipe subassembly and air exhaust pipe subassembly, to support the welding modularization of pipeline structure and support the front -positioned nitrogen filling welding of modularization pipeline internal hidden point, be favorable to the improvement of production efficiency and production process quality control, especially suitable for mass production mode.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning unit technology, specifically to a device for positioning pipeline parts or components during modular pipeline assembly. Background Technology

[0002] The production of air conditioning units involves the piping of multiple pipe parts or components. In existing technology, the pipe parts and components of air conditioning units are generally assembled into a whole on the final assembly line using multi-point welding. In actual production, the aforementioned assembly method has the following problems: First, production efficiency is low. Because piping involves many pipe parts or components, there are also many welding points, resulting in complicated procedures. At the same time, some welding points are difficult to operate due to space constraints after the necessary preliminary assembly processes of other air conditioning components such as partitions and condensers.

[0003] Secondly, it is not conducive to quality control. Air conditioning units have many piping components, which makes process quality control difficult; in addition, after necessary preliminary assembly processes, some welding points are not only difficult to operate but also easy to burn other parts, which can easily lead to quality problems. Utility Model Content

[0004] This invention aims to overcome the shortcomings of the existing technology by providing a modular pipeline assembly device.

[0005] The present invention adopts the following technical solution to solve the technical problem: a modular pipeline combination device for positioning a vapor-liquid separator, a four-way valve assembly, an intake pipe assembly and an exhaust pipe assembly, a welding frame installed on the top of the base, and equipped with a vapor separation positioning structure, a positioning nozzle group, an intake pipe structure, an exhaust pipe and a positioning box; The vapor separator positioning structure is arranged corresponding to the vapor-liquid separator and fixed on the welding frame; a pair of positioning boxes are arranged corresponding to the U-shaped tube of the intake pipe assembly and the U-shaped tube of the exhaust pipe assembly, respectively, and are installed and fixed to the welding frame; a pair of positioning nozzle groups are arranged corresponding to the four-way valve assembly and are installed and connected to the welding frame; the air inlet pipe structure and the air outlet pipe are arranged corresponding to the intake pipe of the intake pipe assembly and the exhaust pipe of the exhaust pipe assembly, respectively, and are installed and fixed to the welding frame.

[0006] Furthermore, the vapor separator positioning structure includes a bracket and a backing plate, with the bracket and the backing plate arranged vertically above each other. The vapor-liquid separator is positioned against one side of the backing plate, and its mounting plate is hung on the bracket.

[0007] Furthermore, the hanging bracket and the welding frame are formed as an integral structure, and the backing plate is installed and fixed to the welding frame by backing plate fasteners.

[0008] Furthermore, the positioning nozzle assembly includes a vertical rod, a positioning block, a positioning shaft, a positioning sleeve, a positioning rod, a swing rod, and a positioning nozzle; The welding frame has a long strip-shaped mounting groove. The upright, the positioning shaft and the positioning rod are arranged in a spatially perpendicular manner with their axes perpendicular to each other, and the axis of the positioning rod is parallel to the length direction of the mounting groove. The upright is inserted into the mounting groove and can slide along the length of the mounting groove, and is fixed by the upright fastener; The positioning block is slidably fitted onto the upright and can slide along the axis of the upright. It is locked and limited by a locking structure. The positioning sleeve is installed and fixed to the positioning block by the positioning shaft and the positioning shaft fastener. The positioning rod passes through the positioning sleeve and is fixedly connected to the positioning sleeve. One end of the rod is rotatably installed and connected to one end of the swing rod and is relatively limited and locked. The other end of the swing rod is fixedly provided with a positioning nozzle.

[0009] Furthermore, the upright has external threads, and a pair of upright nuts are located above and below the mounting groove, respectively, and are threaded together with the upright to secure it to the welding frame.

[0010] Furthermore, the positioning block has a vertical through-hole for mounting the upright, and the end of the upright mounting hole facing the positioning block has an opening for the positioning block. The upright is inserted into the upright mounting hole and is slidably connected to the positioning block. The locking structure is an internal hexagonal fastener, in which the positioning block through one side of the opening of the positioning block and the positioning block on the other side are threadedly fastened and fixed, restricting the relative sliding of the upright and the positioning block; One end of the positioning rod is rotatably connected to one end of the swing rod via a pin, and is relatively limited and locked when the pin is tightened.

[0011] Furthermore, the air intake pipe structure includes an air intake pipe and a nitrogen filling nozzle, and the air intake pipe is connected to the nitrogen filling pipe through the nitrogen filling nozzle fixed thereon.

[0012] Furthermore, the bottom ends of the air inlet pipe and the air outlet pipe are fixed with U-shaped bases, and are installed and fixed to the welding frame by the U-shaped bases and nut fasteners.

[0013] Furthermore, the positioning box structure includes a positioning box and a positioning box screw; The positioning box has a box-like structure with an open top and a positioning box screw fixed to the bottom. The positioning box screw has an external thread and is set vertically through the welding frame. A pair of positioning box nuts are respectively threaded and fastened to the positioning box screw above and below the connection between the positioning box screw and the welding frame, thereby fixing the positioning box screw to the welding frame.

[0014] Furthermore, the welding frame is rotatably connected to the base, the welding frame has a pull rod hole, and the base has positioning holes evenly distributed along the circumference. It also features a pull rod structure that includes a pull rod, a spring, a limit platform, and a handle; The pull rod is slidably inserted into the pull rod hole, and the handle and the limiting platform are respectively fixed at its top and bottom ends; the spring is sleeved on the pull rod, and its two ends abut against the limiting platform and the welding frame respectively; The spring force tends to cause the pull rod to slide down in the pull rod hole until it is engaged with the limiting platform and locked into the corresponding positioning hole.

[0015] This utility model provides a modular pipeline assembly device, which has the following advantages: 1. This utility model uses a welding frame as the positioning basis, and through the equipped vapor separator positioning structure, positioning nozzle group, air inlet pipe structure, air outlet pipe and positioning, it realizes the positioning of vapor-liquid separator, four-way valve assembly, air intake pipe assembly and exhaust pipe assembly, so as to support the modular welding of pipeline structure and support the pre-nitrogen purging welding of concealed points in modular pipeline, which is conducive to improving production efficiency and production process quality control, and is particularly suitable for mass production mode.

[0016] 2. This utility model can not only ensure the positioning and assembly accuracy of the internal pipeline components of the modular pipeline, but also ensure the correct external assembly dimensions of the modular pipeline, thereby ensuring the smooth assembly of the overall modular pipeline.

[0017] 3. The installation height of the positioning box of this utility model is adjustable, the installation height, installation position and angle of the positioning nozzle assembly are adjustable, the air inlet pipe structure and air outlet pipe are replaceable and the installation angle is adjustable, which can adapt to the piping and assembly needs of different models of pipeline components within a certain range, and has good adaptability.

[0018] 4. This utility model realizes modular production of pipeline structure, puts quality control in advance, enables early testing and inspection of materials before final assembly, avoids the operational difficulties of assembling individual components in a scattered manner, reduces assembly and welding problems of components, lowers the defect rate, and helps ensure product quality.

[0019] 5. This utility model also realizes modular feeding of pipeline components, allowing for division of labor and cooperation, improving flexibility, and thus simplifying the production process. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the positioning nozzle assembly of this utility model; Figure 3 This is a schematic diagram of the intake pipe structure of this utility model; Figure 4 This is a schematic diagram of the usage process of this utility model.

[0021] In the picture: 1. Base; 11. Positioning hole; 2. Welding frame; 21. Mounting groove; 22. Pull rod hole; 23. Crossbeam; 3. Gas separator positioning structure; 31. Hanger; 32. Backing plate; 4. Positioning nozzle assembly; 41. Upright; 42. Positioning block; 43. Positioning shaft; 44. Positioning sleeve; 45. Positioning rod; 46. Swing rod; 47. Positioning nozzle; 5. Air inlet pipe structure; 51. Air inlet pipe; 52. Nitrogen filling nozzle; 6. Pull rod structure; 61. Pull rod; 62. Spring; 63. Limiting platform; 64. Handle; 7. Air outlet pipe; 8. Positioning box structure; 81. Positioning box; 82. Positioning box screw. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] A modular piping assembly device, such as Figures 1-3 As shown, its structural relationship is as follows: for positioning the gas-liquid separator, four-way valve assembly, intake pipe assembly and exhaust pipe assembly, welding frame 2 is installed on the top of base 1, and is provided with gas separation positioning structure 3, positioning nozzle group 4, intake pipe structure 5, exhaust pipe 7 and positioning box structure 8. The vapor separator positioning structure 3 is arranged corresponding to the vapor-liquid separator and is fixed on the welding frame 2; a pair of positioning box structures 8 are arranged corresponding to the U-shaped tubes of the suction pipe assembly and the exhaust pipe assembly, respectively, and are installed and fixed to the welding frame 2; a pair of positioning nozzle groups 4 are arranged corresponding to the four-way valve assembly and are installed and connected to the welding frame 2; the air inlet pipe structure 5 and the air outlet pipe 7 are arranged corresponding to the air inlet pipe assembly and the exhaust pipe assembly, respectively, and are installed and fixed to the welding frame 2.

[0024] Preferably, the vapor separator positioning structure 3 includes a bracket 31 and a backing plate 32. The bracket 31 and the backing plate 32 are arranged vertically. The vapor-liquid separator is placed against one side of the backing plate 32, and its mounting plate is hung on the bracket 31.

[0025] Preferably, the hanger 31 and the welding frame 2 are formed into an integral structure, and the backing plate 32 is installed and fixed to the welding frame 2 by backing plate fasteners.

[0026] Preferably, the positioning nozzle assembly 4 includes a vertical rod 41, a positioning block 42, a positioning shaft 43, a positioning sleeve 44, a positioning rod 45, a swing rod 46, and a positioning nozzle 47; The welding frame 2 has a long strip-shaped mounting groove 21. The upright 41, positioning shaft 43 and positioning rod 45 are set in a spatially perpendicular manner with their axes in pairs, and the axis of the positioning rod 45 is parallel to the length direction of the mounting groove 21. The upright 41 is inserted into the mounting groove 21 and can slide along the length of the mounting groove 21, and is fixed by the upright fastener; This enables the positioning nozzle assembly 4 to be adjusted along the length of the mounting groove 21 towards the mounting position; The positioning block 42 is slidably fitted onto the upright 41, and can slide along the axis of the upright 41. It is locked and limited by the locking structure, so that the positioning block 42 can be adjusted in installation height. The positioning sleeve 44 is installed and fixed to the positioning block 42 through the positioning shaft 43 and the positioning shaft fastener, so that the positioning rod 45 can be adjusted 360° around the axis of the positioning shaft 43. The positioning rod 45 is set through the positioning sleeve 44 and is fixedly connected to the positioning sleeve 44. One end of the rod is rotatably installed and connected to one end of the swing rod 46 and is relatively limited and locked. The other end of the swing rod 46 is fixedly provided with a positioning nozzle 47.

[0027] Preferably, the upright 41 is provided with external threads, and a pair of upright nuts are located above and below the mounting groove 21 respectively, and are threadedly engaged with the upright 41 to secure it to the welding frame 2.

[0028] The positioning nozzle assembly 4 can achieve 360° adjustment of the installation angle around the axis of the upright 41, as well as adjustment of the installation height, to adapt to the positioning needs of different pipeline structures.

[0029] Preferably, the positioning block 42 has a vertical through-hole for mounting the upright, and the end of the upright mounting hole facing the positioning block 42 has an opening for the positioning block. The upright 41 is inserted into the upright mounting hole and is slidably connected to the positioning block 42. The locking structure is a hexagonal socket fastener. The positioning block 42, which passes through one side of the positioning block opening, is threadedly fastened to the positioning block on the other side, thus restricting the relative sliding between the upright 41 and the positioning block 42. Before the upright 41 and the positioning block 42 are fastened with hexagonal socket fasteners, the installation height of the positioning block 42 on the upright 41 and the installation angle of the positioning block 42 around the axis of the upright 41 can be adjusted according to actual needs. However, both of these adjustments can be achieved by adjusting the installation height and installation angle of the upright 41 in the mounting groove 21. Compared with the need for tools to loosen and tighten the hexagonal socket fasteners, the loosening and tightening of the upright nut can be done by hand. Therefore, in actual adjustment, the installation height and installation angle of the upright 41 in the mounting groove 21 are generally chosen to adapt to the positioning needs of different pipeline structures. One end of the positioning rod 45 is rotatably connected to one end of the swing rod 46 via a pin, and is relatively locked when the pin is tightened.

[0030] Preferably, the air intake pipe structure 5 includes an air intake pipe 51 and a nitrogen filling nozzle 52, wherein the air intake pipe 51 is connected to the nitrogen filling pipe through the nitrogen filling nozzle 52 fixed thereon.

[0031] Nitrogen gas supplied by the nitrogen filling pipe enters the modular pipeline sequentially through the nitrogen filling nozzle 52 and the air inlet pipe 51 to support the nitrogen filling welding of the modular pipeline components and prevent oxide scale from forming inside the modular pipeline components during the welding process.

[0032] Preferably, the bottom ends of the air inlet pipe 51 and the air outlet pipe 7 are fixed with U-shaped bases and are installed and fixed to the welding frame 2 by means of U-shaped bases and nuts.

[0033] The U-shaped base is used to adjust the installation angle of the air inlet pipe 51 and the air outlet pipe 7 around their own axis to adapt to the assembly and welding of different pipe structures of the modular pipeline. In actual setup, the bottom of the welding frame 2 is preferably a rectangular frame structure, and a crossbeam 23 is set along the width of the frame. The U-shaped base at the bottom of the air inlet pipe 51 and the air outlet pipe 7 is preferably set at an easily identifiable angle of 0°, 45° or 90° with the center line of the crossbeam 23.

[0034] Preferably, the positioning box structure 8 includes a positioning box 81 and a positioning box screw 82; The positioning box 81 has a box-like structure with an open top and a positioning box screw 82 fixed to the bottom. The positioning box screw 82 has an external thread and is set to pass through the welding frame 2 vertically. A pair of positioning box nuts are respectively threaded and fastened to the positioning box screw 82 from above and below the connection between the positioning box screw 82 and the welding frame 2, thereby fixing the positioning box screw 82 to the welding frame 2.

[0035] Preferably, the welding frame 2 is rotatably connected to the base 1, and the welding frame 2 is preferably externally connected to a drive motor to drive its rotation. The welding frame 2 is provided with a tie rod hole 22, and the base 1 is provided with positioning holes 11 evenly distributed along the circumference. It also includes a pull rod structure 6 comprising a pull rod 61, a spring 62, a limiting platform 63, and a handle 64; The pull rod 61 is slidably inserted into the pull rod hole 22, and a handle 64 and a limiting platform 63 are fixed at its top and bottom ends respectively; the spring 62 is sleeved on the pull rod 61, and its two ends abut against the limiting platform 63 and the welding frame 2 respectively. The elastic force of the spring 62 tends to cause the pull rod 61 to slide down in the pull rod hole 22 and engage with the limiting platform 63 to lock into the corresponding positioning hole 11, thereby limiting the relative rotation between the welding frame 2 and the base 1.

[0036] Before using the above-mentioned modular piping assembly device to assemble piping parts or components for a certain model of machine, the device should first be debugged, including the following process: The first step is to engage the limiting platform 63 of the tie rod structure 6 with the corresponding positioning hole 11 to restrict the relative rotation between the welding frame 2 and the base 1.

[0037] The second step is to select the appropriate air inlet pipe structure 5 and air outlet pipe 7 according to the piping structure of the machine model, and install and fix the air inlet pipe 51 and air outlet pipe 7 to the welding frame 2 at an appropriate angle through the U-shaped base and nut.

[0038] The third step is to adjust the installation height of the positioning box 81. Specifically, loosen the positioning box nut, move the positioning box screw 82 up and down relative to the welding frame 2 and rotate it around its own axis to a suitable installation height and angle, and then tighten the positioning box nut again.

[0039] The fourth step is to adjust the installation height, installation position, installation angle around the upright rod 41, installation angle around the positioning shaft 43, and installation angle around the rear end of the positioning rod 45 of the positioning nozzle 47 in the positioning nozzle assembly 4. Method 1: The specific adjustment method for the installation position is to loosen the pole nut and slide the pole 41 along the mounting groove 21 to the appropriate installation position; Method 2: The general way to adjust the installation height and the installation angle around the upright 41 is to loosen the upright nut, move the upright 41 up and down relative to the mounting groove 21 and rotate it around its own axis to a suitable installation height and installation angle, and then tighten the upright nut again. Method 3: If necessary, the installation height and the installation angle around the upright 41 can also be adjusted in the following ways: use a tool to loosen the hexagonal fastener, move the positioning block 42 up and down relative to the upright 41 and rotate it around the axis of the upright 41 to a suitable installation height and installation angle, and then use a tool to tighten the hexagonal fastener again. Method 4: The specific adjustment method for the installation angle around the positioning shaft 43 is to loosen the positioning shaft fastener, rotate the positioning shaft 43 around its own axis to a suitable installation angle, and then tighten the positioning shaft fastener again.

[0040] Method 5: The specific adjustment method for the installation angle around the rear end of the positioning rod 45 is to loosen the pin, swing the swing arm 46 up or down around the rear end of the positioning rod 45 to a suitable installation angle, and then tighten the pin again.

[0041] Through the adjustment method in the fourth step above, the positioning position and positioning posture of the positioning nozzle 47 can be adjusted in a comprehensive and diversified manner to better adapt to the positioning needs of different pipeline structures. At the same time, during the adjustment process, only some methods can be adjusted according to actual needs such as the adjustment range, so as to simplify the adjustment operation and improve the adjustment efficiency.

[0042] To facilitate rapid switching and adjustment of the device during subsequent mass production to adapt to the piping and assembly requirements of different models, after the initial commissioning of the device for a specific model, it is preferable to mark and record the installation positions of the corresponding air inlet pipe structure 5, air outlet pipe 7, positioning box structure 8, and positioning nozzle assembly 4. The installation height of the positioning box 81 is preferably marked on the positioning box screw 82, at the top surface of the positioning box nut located above.

[0043] The installation height of the upright 41 in the mounting groove 21 is preferably marked on the upright 41 with a scale mark at the top surface of the upright nut located above.

[0044] The installation angles of the air inlet pipe 5 and the air outlet pipe 7 are preferably marked on the welding frame 2, with the mark corresponding to the position of the center line of the U-shaped base.

[0045] The installation positions of the intake pipe structure 5, exhaust pipe 7, positioning box structure 8 and positioning nozzle group 4 corresponding to different models are preferably recorded with different colored markings. When different models are installed with intake pipes 51 and exhaust pipes 7 at different heights, corresponding colored markings can also be made on the intake pipes 51 and exhaust pipes 7 for easy differentiation.

[0046] like Figure 4 As shown, when using the above-mentioned modular piping assembly device to assemble piping parts or components for a certain model of machine, the following process is included: The first step is to place the gas-liquid separator on the welding frame 2, hang its mounting plate on the bracket 31, and place the gas-liquid separator against the backing plate 32 to maintain an upright posture.

[0047] The second step is to place the U-shaped tube of the suction pipe assembly in the positioning box structure 8 for support and positioning, and connect one end of the suction pipe assembly to the inlet of the gas-liquid separator and the other end to the air inlet pipe 51.

[0048] The third step is to place the U-shaped tube of the exhaust pipe assembly in another positioning box structure 8 for support and positioning, and connect one end of the exhaust pipe assembly to the exhaust pipe 7.

[0049] The fourth step is to connect the D end of the four-way valve assembly to the unconnected end of the exhaust pipe assembly, connect the S end to the outlet of the gas-liquid separator, and connect the E end and the C end to the positioning nozzles 47 of the pair of positioning nozzle groups 4 for positioning.

[0050] Fifth step, lift the handle 64 to overcome the elastic force of the spring 62 and drive the pull rod 61 to move upward, so that the limiting platform 63 is disengaged from the positioning hole 11, allowing the welding platform 2 to rotate relative to the base 1; Subsequently, nitrogen gas is continuously fed into the modular pipeline through the nitrogen filling pipe, nitrogen filling nozzle 52 and air inlet pipe 51 for nitrogen filling welding of the modular pipeline. During the welding process, the angle of the welding torch can be adjusted by rotating the welding frame 2 to adapt to the welding needs of different pipe welding points and improve the convenience of welding operation, thereby improving production efficiency and welding quality.

[0051] The sixth step involves removing the welded modular pipe structure from the modular pipe assembly device and placing it in the tooling vehicle to form a modular integrated feeding system.

[0052] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0053] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A modular pipeline assembly for positioning a gas-liquid separator, a four-way valve assembly, an intake pipe assembly, and an exhaust pipe assembly, wherein a welding frame (2) is installed on top of a base (1), characterized in that: It is equipped with a steam separation positioning structure (3), a positioning nozzle group (4), an air inlet pipe structure (5), an air outlet pipe (7), and a positioning box structure (8); The vapor separation positioning structure (3) is arranged corresponding to the vapor-liquid separator and fixed on the welding frame (2); a pair of positioning box structures (8) are arranged corresponding to the U-shaped tube of the suction pipe assembly and the U-shaped tube of the exhaust pipe assembly, respectively, and are installed and fixed to the welding frame (2); a pair of positioning nozzle groups (4) are arranged corresponding to the four-way valve assembly and are installed and connected to the welding frame (2); the air inlet pipe structure (5) and the air outlet pipe (7) are arranged corresponding to the air inlet pipe of the suction pipe assembly and the exhaust pipe of the exhaust pipe assembly, respectively, and are installed and fixed to the welding frame (2).

2. The modular pipeline assembly device according to claim 1, characterized in that: The vapor separator positioning structure (3) includes a bracket (31) and a backing plate (32). The bracket (31) and the backing plate (32) are arranged vertically. The vapor-liquid separator is placed against the backing plate (32) and its mounting plate is hung on the bracket (31).

3. The modular pipeline assembly device according to claim 2, characterized in that: The hanging bracket (31) and the welding frame (2) are formed into an integral structure, and the backing plate (32) is installed and fixed to the welding frame (2) by the backing plate fastener.

4. The modular pipeline assembly device according to claim 1, characterized in that: The positioning nozzle assembly (4) includes a vertical rod (41), a positioning block (42), a positioning shaft (43), a positioning sleeve (44), a positioning rod (45), a swing rod (46), and a positioning nozzle (47). The welding frame (2) is provided with a long strip-shaped mounting groove (21). The upright (41), the positioning shaft (43) and the positioning rod (45) are arranged in a spatially perpendicular manner with their axes perpendicular to each other, and the axis of the positioning rod (45) is parallel to the length direction of the mounting groove (21). The upright (41) is inserted into the mounting groove (21) and can slide along the length direction of the mounting groove (21), and is fixed by the upright fastener; The positioning block (42) is slidably fitted onto the upright (41) and can slide along the axis of the upright (41), and is locked and limited by the locking structure; the positioning sleeve (44) is installed and fixed to the positioning block (42) through the positioning shaft (43) and the positioning shaft fastener; the positioning rod (45) is set through the positioning sleeve (44) and fixedly connected to the positioning sleeve (44); one end of the rod is rotatably installed and connected to one end of the swing rod (46) and is relatively limited and locked; the other end of the swing rod (46) is fixedly provided with a positioning nozzle (47).

5. A modular pipeline assembly device according to claim 4, characterized in that: The upright (41) is provided with external threads, and a pair of upright nuts are located above and below the mounting groove (21) respectively, and are threadedly engaged with the upright (41) to secure it, thereby installing and fixing the upright (41) to the welding frame (2).

6. A modular pipeline assembly device according to claim 5, characterized in that: The positioning block (42) has a vertical through-hole for mounting the upright. The end of the upright mounting hole facing the positioning block (42) has an opening for the positioning block. The upright (41) is inserted into the upright mounting hole and is slidably connected to the positioning block (42). The locking structure is an internal hexagonal fastener. The positioning block (42) passing through one side of the opening of the positioning block is threadedly fastened to the positioning block on the other side, thereby restricting the relative sliding of the upright (41) and the positioning block (42). One end of the positioning rod (45) is rotatably connected to one end of the swing rod (46) via a pin, and is relatively locked when the pin is tightened.

7. A modular pipeline assembly device according to claim 1, characterized in that: The air intake pipe structure (5) includes an air intake pipe (51) and a nitrogen filling nozzle (52). The air intake pipe (51) is connected to the nitrogen filling pipe through the nitrogen filling nozzle (52) fixed thereon.

8. A modular pipeline assembly device according to claim 7, characterized in that: The bottom ends of the air inlet pipe (51) and the air outlet pipe (7) are fixed with U-shaped bases and are installed and fixed to the welding frame (2) by the U-shaped bases and nut fasteners.

9. A modular pipeline assembly device according to claim 1, characterized in that: The positioning box structure (8) includes a positioning box (81) and a positioning box screw (82). The positioning box (81) has a box structure with an open top and the positioning box screw (82) is fixedly connected to the bottom. The positioning box screw (82) has an external thread and is set to pass through the welding frame (2) vertically. A pair of positioning box nuts are respectively tightened by threaded engagement with the positioning box screw (82) above and below the connection between the positioning box screw (82) and the welding frame (2), thereby fixing the positioning box screw (82) to the welding frame (2).

10. A modular pipeline assembly device according to claim 1, characterized in that: The welding frame (2) is rotatably connected to the base (1). The welding frame (2) has a pull rod hole (22), and the base (1) has positioning holes (11) evenly distributed along the circumference. It also includes a pull rod structure (6) comprising a pull rod (61), a spring (62), a limiting platform (63) and a handle (64); The pull rod (61) is slidably inserted into the pull rod hole (22), and the handle (64) and the limiting platform (63) are fixed at its top and bottom ends respectively; the spring (62) is sleeved on the pull rod (61), and its two ends abut against the limiting platform (63) and the welding frame (2) respectively. The elastic force of the spring (62) tends to cause the pull rod (61) to slide down in the pull rod hole (22) and engage with the limiting platform (63) in the corresponding positioning hole (11).

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