A welding tool for a multi-point intelligent measuring system sampling device for SCR denitration

Abstract

The utility model discloses workpiece welding field, specifically discloses a kind of welding tool for the sampling device of multi-point intelligent measuring system of SCR denitration. The welding tool includes bottom plate, flange fixed plate, flange support plate and pipeline support plate, flange fixed plate and pipeline support plate are vertically fixed on bottom plate by insertion and welding, flange support plate is in close contact with flange fixed plate and is fixed on bottom plate by welding. The welding tool can flexibly set the position of each support positioning component according to demand, has higher stability through the double fixation of insertion and welding. The welding tool is used for welding and processing sampling device, through accurate positioning and fixing of flange and pipeline, effectively avoids the displacement of pipeline and flange during welding, guarantees the straightness and air tightness of sampling device after welding, meets the sampling detection demand in SCR denitration process;And multiple pipeline and flange workpiece can be formed by spot welding once, simplify process flow, convenient for actual use.

Description

Technical Field

[0001] This utility model relates to the field of workpiece welding, specifically to a welding fixture for a sampling device of a multi-point intelligent measurement system for SCR denitrification. Background Technology

[0002] Due to process control requirements, the SCR denitrification process necessitates sampling and testing at multiple locations within the reaction unit to better control the reaction progress. The sampling device of the multi-point intelligent measurement system used in this sampling and testing process comprises multiple branch pipelines and flange components for sealing joints. Its complex structure often employs multiple sections of pipeline and flanges working together to accommodate the needs of multi-point sampling and testing. Furthermore, due to high airtightness requirements, the processing precision requirements are also high. Traditional welding methods, which involve welding individual components and then assembling the whole, or welding individual components sequentially, are not only time-consuming and labor-intensive but also struggle to guarantee the straightness of the overall product, making it difficult to meet the overall airtightness and other performance requirements of the unit. Utility Model Content

[0003] The purpose of this invention is to overcome the problems of low welding accuracy, poor airtightness, and straightness after welding in existing multi-point intelligent measurement system sampling devices. It provides a welding fixture for a multi-point intelligent measurement system sampling device used in SCR denitrification. This miniature feeding device includes a base plate, a flange fixing plate, a flange support plate, and a pipeline support plate. The flange fixing plate and the pipeline support plate are vertically fixed to the base plate by insertion and welding. The flange support plate is tightly attached to the flange fixing plate and fixed to the base plate together by welding. Multiple insertion ports on the base plate can be flexibly set according to the structure of the sampling device and the positions of the pipelines and flanges, facilitating adjustment. The double fixing through insertion and welding ensures a firm connection between the flange fixing plate, flange support plate, and pipeline support plate and the base plate, effectively preventing displacement of the pipelines and flanges during welding, ensuring accurate alignment of each workpiece, and guaranteeing the straightness and airtightness of the sampling device after welding. By using this welding fixture to weld a multi-point intelligent measurement system sampling device, multiple pipelines and flange workpieces can be spot welded into shape at one time, simplifying the process flow, and having good straightness and airtightness, thus meeting the sampling and testing requirements in the SCR denitrification process.

[0004] To achieve the above objectives, this utility model provides a welding fixture for a sampling device of a multi-point intelligent measurement system for SCR denitrification. The welding fixture includes a base plate, a flange fixing plate, a flange support plate, and a pipeline support plate. The base plate is provided with several positioning holes. The flange fixing plate and the pipeline support plate are inserted into the base plate through the positioning holes and fixed by welding. The flange fixing plate and the pipeline support plate are perpendicular to the base plate. The flange support plate is close to the flange fixing plate and parallel to the flange fixing plate, and is welded to the base plate.

[0005] Preferably, the thickness of the base plate is 10-50 mm.

[0006] Preferably, the base plate is made of carbon steel, 304 stainless steel, or 316 stainless steel.

[0007] Preferably, the flange fixing plate is inserted into the base plate through the first positioning hole and fixed by welding. The upper part of the flange fixing plate has a flange positioning groove and at least two flange holes that match the openings on the flange to be processed. The bottom is shaped to fit the first positioning hole.

[0008] Preferably, the upper part of the flange support plate has a semi-circular arc-shaped groove that adapts to the outer diameter of the flange to be processed.

[0009] Preferably, the center line of the flange positioning groove on the upper part of the flange fixing plate and the center line of the semi-circular groove on the upper part of the flange support plate are the same straight line and parallel to the plane where the base plate is located.

[0010] Preferably, the pipeline support plate is inserted into the base plate through the second positioning hole and fixed by welding. The upper part of the pipeline support plate is a semi-circular arc-shaped groove adapted to the outer diameter of the pipeline to be processed, and the bottom part is shaped to adapt to the second positioning hole.

[0011] Preferably, the sampling device of the multi-point intelligent measurement system includes at least two interconnected pipelines, and the number of flange fixing plates and flange support plates is the same, with at least two of each.

[0012] Preferably, the welding fixture further includes at least one multi-groove pipe support plate, which is inserted into the base plate through a third positioning hole and fixed by welding.

[0013] Preferably, the upper part of the multi-groove pipeline support plate is provided with at least two semi-circular arc-shaped grooves adapted to the outer diameter of the pipeline to be processed and several flange positioning holes distributed near the semi-circular grooves, and the bottom is shaped to adapt to the third positioning hole.

[0014] The welding fixture for a multi-point intelligent measurement system sampling device for SCR denitrification according to this utility model includes a base plate, a flange fixing plate, a flange support plate, and a pipeline support plate. The flange fixing plate and the pipeline support plate are vertically fixed to the base plate by insertion and welding. The flange support plate is tightly attached to the flange fixing plate and fixed to the base plate together by welding. Multiple insertion ports on the base plate can be flexibly set according to the structure of the sampling device and the positions of the pipelines and flanges, facilitating adjustment. The double fixing through insertion and welding ensures a firm connection between the flange fixing plate, the flange support plate, and the pipeline support plate and the base plate. The positioning and fixing functions of the flange fixing plate, the flange support plate, and the pipeline support plate effectively prevent displacement of the pipelines and flanges during welding, ensuring accurate alignment of each workpiece and guaranteeing the straightness and airtightness of the sampling device after welding. By using this welding fixture, multiple pipelines and flanges can be spot-welded in one operation, simplifying the process flow and providing good straightness and airtightness, meeting the sampling and testing requirements in the SCR denitrification process. Attached Figure Description

[0015] Figure 1 This is the overall assembly plan view of the welding fixture provided in Embodiment 1 of this utility model.

[0016] Figure 2 This is a schematic diagram of the base plate structure of the welding fixture provided in Embodiment 1 of this utility model.

[0017] Figure 3 This is a schematic diagram of the flange fixing plate structure of the welding fixture provided in Embodiment 1 of this utility model.

[0018] Figure 4 This is a schematic diagram of the flange support plate structure of the welding fixture provided in Embodiment 1 of this utility model.

[0019] Figure 5 This is a schematic diagram of the pipe support plate structure of the welding fixture provided in Embodiment 1 of this utility model.

[0020] Figure 6 This is a schematic diagram of the multi-groove pipe support plate structure of the welding fixture provided in Embodiment 1 of this utility model.

[0021] Explanation of reference numerals in the attached figures 1. Base plate; 11. Positioning hole; 11a. First positioning hole; 11b. Second positioning hole; 11c. Third positioning hole; 2. Flange fixing plate; 21. Flange hole; 22. Flange positioning groove; 3. Flange support plate; 4. Pipeline support plate; 4a. Multi-groove pipeline support plate; 4a1. Flange positioning hole. Detailed Implementation

[0022] The specific embodiments of this utility model are described in detail below. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0023] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0024] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating relative importance or implying the number of technical features indicated. Therefore, unless otherwise stated, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "multiple" means two or more. The term "comprising" and any variations thereof mean non-exclusive inclusion, where one or more other features, integers, steps, operations, units, components, and / or combinations thereof may be present or added.

[0025] In the description of this application, the term "comprising" and any variations thereof mean non-exclusive inclusion, meaning that one or more other features, integers, steps, operations, units, components, and / or combinations thereof may be present or added. Terms indicating orientation or positional relationships, such as "center," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," are used to describe the orientation or relative positional relationships shown in the accompanying drawings and are merely for the purpose of simplifying the description of this application. They do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application.

[0026] Furthermore, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0027] like Figure 1 and 2As shown, this utility model provides a welding fixture for a sampling device of a multi-point intelligent measurement system for SCR denitrification. The welding fixture includes a base plate 1, a flange fixing plate 2, a flange support plate 3, and a pipeline support plate 4. The base plate 1 is provided with several positioning holes 11. The flange fixing plate 2 and the pipeline support plate 4 are inserted into the base plate 1 through the positioning holes 11 and fixed by welding. The flange fixing plate 2 and the pipeline support plate 4 are perpendicular to the base plate 1. The flange support plate 3 is close to the flange fixing plate 2 and is arranged parallel to the flange fixing plate 2, and is welded and fixed to the base plate 1.

[0028] In a specific embodiment of this utility model, such as Figure 2 As shown, the number of positioning holes 11 can be set according to the number of flanges and pipelines to be processed. Considering the length of the pipelines to be processed, each section of the pipeline should generally be provided with at least two positioning holes 11 for inserting the pipeline support plate 4, and each flange to be processed should be provided with one positioning hole 11 for inserting the flange fixing plate 2. The position of the positioning holes 11 is determined according to the position of the flanges and pipelines to be processed in the sampling device of the multi-point intelligent measurement system, ensuring that the sampling device is directly formed after welding. The size of the positioning holes 11 is determined by the size of the flange fixing plate 2 and the pipeline support plate 4 to be inserted. Figure 2 As shown, the flange fixing plate 2 can be connected to the first positioning hole 11a and the pipeline support plate 4 to the second positioning hole 11b, so as to ensure the firm connection between the flange fixing plate 2 and the pipeline support plate 4 and the base plate 1, and avoid relative displacement during welding, which would lead to a decrease in processing accuracy.

[0029] In the welding fixture of this utility model, preferably, the thickness of the base plate 1 is 10-50mm, more preferably 10-40mm, and most preferably 10-35mm. In this utility model, using a base plate of the above thickness ensures that the positioning hole 11 has sufficient depth, which is beneficial for the insertion of the flange fixing plate 2 and the pipe support plate 4, and provides good stability.

[0030] In the welding fixture of this utility model, preferably, the base plate 1 is made of carbon steel, 304 stainless steel or 316 stainless steel, more preferably carbon steel or 304 stainless steel.

[0031] In the welding fixture of this utility model, in a preferred case, such as Figure 3As shown, the flange fixing plate 2 is inserted into the base plate 1 through the first positioning hole 11a and fixed by welding. The upper part of the flange fixing plate 2 has a flange positioning groove 22 and at least two flange holes 21 that match the openings on the flange to be processed. The bottom is shaped to fit the first positioning hole 11a. In this utility model, the flange holes 21 are opened according to the relevant national standard flange dimensions and are consistent with the flange hole dimensions on the flange to be processed, so as to position and fix the flange to be processed during welding. The flange positioning groove 22 in the center has the same outer diameter as the part of the flange to be processed that connects to the pipeline. During welding, the part of the flange to be processed that connects to the pipeline can be placed in the positioning groove, further realizing the positioning and fixing of the flange to be processed.

[0032] In the welding fixture of this utility model, in a preferred case, such as Figure 4 As shown, the upper part of the flange support plate 3 has a semi-circular arc-shaped groove that adapts to the outer diameter of the flange to be processed. In this utility model, the flange to be processed is fixed by the upper groove design. The groove on the outside of the flange to be processed can better fix the flange and avoid relative displacement during welding.

[0033] In the welding fixture of this utility model, preferably, the center line of the flange positioning groove 22 on the upper part of the flange fixing plate 2 and the center line of the semi-circular groove on the upper part of the flange support plate 3 are the same straight line and parallel to the plane where the base plate 1 is located. In this utility model, through the above structural design, the flange to be processed is placed perpendicular to the base plate 1, which is beneficial to maintaining the straightness of the flange and the pipeline.

[0034] In the welding fixture of this utility model, in a preferred case, such as Figure 5 As shown, the pipeline support plate 4 is inserted into the base plate 1 through the second positioning hole 11b and fixed by welding. The upper part of the pipeline support plate 4 is a semi-circular arc-shaped groove adapted to the outer diameter of the pipeline to be processed, and the bottom is shaped to fit the second positioning hole 11b. In this utility model, the semi-circular arc-shaped groove design that fits the outer side of the pipeline to be processed is beneficial for better fixing and positioning of the pipeline to be processed.

[0035] In a specific embodiment of this utility model, when welding pipelines and flanges on the same straight line, the center line of the semi-circular groove on the upper part of the pipeline support plate 4, the center line of the flange positioning groove 22 on the upper part of the flange fixing plate 2, and the center line of the semi-circular groove on the upper part of the flange support plate 3 are all on the same straight line and parallel to the plane of the base plate 1. This structure ensures accurate alignment of the flange and pipeline to be processed during welding, guaranteeing the straightness and airtightness of the sampling device after processing.

[0036] In the welding fixture of this utility model, preferably, the multi-point intelligent measurement system sampling device includes at least two interconnected pipelines, and the number of flange fixing plates 2 and flange support plates 3 is the same and at least two. In a specific embodiment, the flange fixing plates 2 and flange support plates 3 should be used in pairs to obtain better fixing and positioning effects. Due to the requirement of the multi-point intelligent measurement system to sample and test multiple sites of the SCR denitrification device, the sampling device includes at least two interconnected pipelines and is connected to the sampling points through flanges at the ends of the pipelines to facilitate sampling and testing. Therefore, the welding fixture used for welding the sampling device should include at least two flange fixing plates 2 and two flange support plates 3.

[0037] In the welding fixture of this utility model, in a preferred embodiment, the welding fixture further includes at least one multi-groove pipe support plate 4a, which is inserted into the base plate 1 through the third positioning hole 11c and fixed by welding.

[0038] In the welding fixture of this utility model, in a preferred embodiment, the upper part of the multi-groove pipe support plate 4a is provided with at least two semi-circular arc-shaped grooves adapted to the outer diameter of the pipe to be processed and a number of flange positioning holes 4a1 distributed near the semi-circular grooves, and the bottom is shaped to adapt to the third positioning hole 11c.

[0039] In a specific embodiment of this utility model, when the sampling device of the multi-point intelligent measurement system has two parallel pipelines that are close to each other, the two adjacent pipeline support plates 4 supporting the two parallel pipelines can be replaced with one such... Figure 1 and Figure 6 The multi-groove pipe support plate 4a shown has two semi-circular arc-shaped grooves on the upper part to adapt to the outer diameter of the pipe to be processed, and a lower part to adapt to... Figure 2 The shape of the third positioning hole 11c shown is such that the length of the third positioning hole 11c on the base plate 1 corresponding to the multi-groove pipe support plate 4a should not be less than the distance between the two parallel pipes. The design of the multi-groove pipe support plate 4a with two semi-circular arc grooves can be used to control the distance between the two parallel pipes to meet the requirements and further fix the two parallel pipes, preventing damage to the parallelism of the two pipes due to pipe offset during processing. When the sampling device to be assembled contains multiple parallel pipes, semi-circular arc grooves equal to the number of parallel pipes can be set on the multi-groove pipe support plate 4a, or multiple multi-groove pipe support plates 4a can be set to fix the multiple parallel pipes. In addition, several flange positioning holes 4a1 are also provided near the semi-circular arc grooves on the multi-groove pipe support plate 4a. The flange positioning holes 4a1 are used to assist in positioning the flange to be processed during welding, further improving the positioning effect.

[0040] In a specific embodiment of this utility model, the welding fixture for the sampling device of the multi-point intelligent measurement system for SCR denitrification provided by this utility model includes a base plate 1 with a thickness of 10-50mm and made of carbon steel, at least two flange fixing plates 2, at least two flange support plates 3, several pipeline support plates 4, and at least one multi-groove pipeline support plate 4a. The base plate 1 is provided with several positioning holes 11, the number of which is equal to the sum of the number of flange fixing plates 2, flange support plates 3, pipeline support plates 4, and multi-groove pipeline support plates 4a. The flange fixing plates 2 and the pipeline support plates 4 are respectively inserted into the base plate 1 through the first positioning holes 11a and the second positioning holes 11b and fixed by welding. The flange fixing plates 2 and the pipeline support plates 4 are perpendicular to the base plate 1. The flange support plates 3 are close to the flange fixing plates 2 and are arranged parallel to the flange fixing plates 2, and are welded to the base plate 1. The upper part of the flange fixing plates 2 has a flange positioning groove. 22, and has at least two flange holes 21 that match the openings on the flange to be processed. The bottom is shaped to fit the first positioning hole 11a. The upper part of the flange support plate 3 has a semi-circular arc groove that fits the outer diameter of the flange to be processed. The upper part of the pipeline support plate 4 has a semi-circular arc groove that fits the outer diameter of the pipeline to be processed. The bottom is shaped to fit the second positioning hole 11b. The center line of the semi-circular arc groove on the upper part of the pipeline support plate 4 is the same straight line as the center line of the flange positioning groove 22 on the upper part of the flange fixing plate 2 and the center line of the semi-circular arc groove on the upper part of the flange support plate 3 and is parallel to the plane of the base plate 1. The multi-groove pipeline support plate 4a is inserted into the base plate 1 through the third positioning hole 11c and fixed by welding. The upper part of the multi-groove pipeline support plate 4a is provided with at least two semi-circular arc grooves that fit the outer diameter of the pipeline to be processed and several flange positioning holes 4a1 distributed near the semi-circular grooves. The bottom is shaped to fit the third positioning hole 11c.

[0041] The welding fixture for the sampling device of the multi-point intelligent measurement system for SCR denitrification provided by this utility model includes a base plate 1, a flange fixing plate 2, a flange support plate 3, and a pipeline support plate 4. The flange fixing plate 2 and the pipeline support plate 4 are vertically fixed to the base plate 1 by insertion and welding. The flange support plate 3 is tightly attached to the flange fixing plate 2 and fixed to the base plate 1 together by welding. The multiple insertion interfaces on the base plate can be flexibly set according to the structure of the sampling device and the positions of the pipeline and flange workpieces, which is convenient for adjustment. The double fixing by insertion and welding ensures a firm connection between the flange fixing plate 2, the flange support plate 3, and the pipeline support plate 4 and the base plate 1. The positioning and fixing functions of the flange fixing plate 2, the flange support plate 3, and the pipeline support plate 4 for the flange and pipeline effectively prevent displacement of the pipeline and flange during welding, ensure accurate alignment of each workpiece, and guarantee the straightness and airtightness of the sampling device after welding. By using this welding fixture, multiple pipelines and flanges can be spot-welded in one go, simplifying the process and providing good straightness and airtightness, thus meeting the sampling and testing requirements in the SCR denitrification process.

[0042] In a specific embodiment of this utility model, the method for assembling the aforementioned welding fixture and processing and assembling the multi-point intelligent measurement system sampling device using the welding fixture includes the following steps: (S1) Based on the quantity and location of the pipelines and flanges to be processed required for assembling the multi-point intelligent measurement system sampling device, determine the number, location and size of the positioning holes on the base plate 1, and then use laser cutting to cut out the required positioning holes 11 on the base plate 1 with a thickness of 10-50mm and a material of carbon steel. (S2) Based on the quantity and size of the pipelines and flanges to be processed, the corresponding flange fixing plate 2, flange support plate 3 and pipeline support plate 4 are processed. Then, the flange fixing plate 2 and pipeline support plate 4 are vertically inserted into the corresponding positioning holes 11, and the flange support plate 3 is tightly attached to the flange fixing plate 2. Subsequently, the flange fixing plate 2, flange support plate 3 and pipeline support plate 4 are fixed on the base plate 1 by welding. (S3) Place the flange to be processed on the flange support plate 3 and fix it with the flange fixing plate 2. Place the pipeline to be processed on the pipeline support plate 4 and make the center lines of all flanges to be processed and pipelines to be processed in the same pipeline coincide. Then perform welding to assemble the flanges to be processed and pipelines to be processed into a multi-point intelligent measurement system sampling device.

[0043] The following embodiments further illustrate the welding fixture for the sampling device of the multi-point intelligent measurement system for SCR denitrification described in this utility model. These embodiments are implemented based on the technical solution of this utility model, providing detailed implementation methods and specific operating procedures. However, the scope of protection of this utility model is not limited to the following embodiments.

[0044] Unless otherwise specified, the experimental methods used in the following embodiments are conventional methods in the art. Unless otherwise specified, the experimental materials used in the following embodiments are commercially available.

[0045] Example 1 Assembly such as Figure 1 The sampling device shown is a multi-point intelligent measurement system with two pipelines. This sampling device includes two flanges, four pipeline sections, and one tee. (S1) Laser cutting is used to cut out the following from a 30mm thick carbon steel base plate 1: Figure 2 The first positioning hole 11a of the two plug-in flange fixing plates 2, the second positioning hole 11b of the eight plug-in pipeline support plates 4, and the third positioning hole 11c of the one plug-in multi-groove pipeline support plate 4a are shown. (S2) Based on the quantity and size of the pipelines and flanges to be processed, the corresponding flange fixing plate 2, flange support plate 3, pipeline support plate 4, and multi-groove pipeline support plate 4a are processed. Then, the flange fixing plate 2, pipeline support plate 4, and multi-groove pipeline support plate 4a are vertically inserted into the corresponding first positioning hole 11a, second positioning hole 11b, and third positioning hole 11c. The flange support plate 3 is tightly attached to the flange fixing plate 2. Subsequently, the flange fixing plate 2, flange support plate 3, pipeline support plate 4, and multi-groove pipeline support plate 4a are welded and fixed on the base plate 1. (S3) Place the flange to be processed on the corresponding flange support plate 3 and fix it with the flange fixing plate 2. After connecting the pipeline and tee to be processed by thread, place them on the corresponding pipeline support plate 4 and make the center lines of all flanges to be processed and pipelines to be processed in the same pipeline coincide. Then perform welding to assemble the flanges to be processed and pipelines to be processed into a multi-point intelligent measurement system sampling device. Tests showed that the multi-point intelligent measurement system sampling device assembled in Example 1 had good airtightness at all flange and pipeline connections, and no misalignment at the interfaces.

[0046] As can be seen from Example 1, the welding fixture of the multi-point intelligent measurement system sampling device for SCR denitrification of this utility model can flexibly set the position of the fixed pipeline and flange according to the design requirements of the sampling device, and stably fix the pipeline and flange workpiece of the sampling device. It can obtain a multi-point intelligent measurement system sampling device with good airtightness and no misalignment of the interface through one welding process. It has good overall stability, accurate positioning and high processing accuracy, simplifies the welding process, and can be applied to the welding of sampling devices with multiple branch pipelines, which has positive practical application value.

[0047] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A welding fixture for a sampling device in a multi-point intelligent measurement system for SCR denitrification, characterized in that, The welding fixture includes a base plate (1), a flange fixing plate (2), a flange support plate (3), and a pipeline support plate (4). The base plate (1) is provided with a number of positioning holes (11). The flange fixing plate (2) and the pipeline support plate (4) are inserted into the base plate (1) through the positioning holes (11) and fixed by welding. The flange fixing plate (2) and the pipeline support plate (4) are perpendicular to the base plate (1). The flange support plate (3) is close to the flange fixing plate (2) and is parallel to the flange fixing plate (2), and is welded to the base plate (1).

2. The welding fixture according to claim 1, characterized in that, The thickness of the base plate (1) is 10-50mm.

3. The welding fixture according to claim 1 or 2, characterized in that, The base plate (1) is made of carbon steel, 304 stainless steel or 316 stainless steel.

4. The welding fixture according to claim 1, characterized in that, The flange fixing plate (2) is inserted into the base plate (1) through the first positioning hole (11a) and fixed by welding. The upper part of the flange fixing plate (2) has a flange positioning groove (22) and at least two flange holes (21) that match the openings on the flange to be processed. The bottom is shaped to fit the first positioning hole (11a).

5. The welding fixture according to claim 4, characterized in that, The upper part of the flange support plate (3) is a semi-circular arc-shaped groove adapted to the outer diameter of the flange to be processed.

6. The welding fixture according to claim 5, characterized in that, The center line of the flange positioning groove (22) on the upper part of the flange fixing plate (2) and the center line of the semi-circular groove on the upper part of the flange support plate (3) are the same straight line and parallel to the plane where the base plate (1) is located.

7. The welding fixture according to claim 1 or 6, characterized in that, The pipeline support plate (4) is inserted into the base plate (1) through the second positioning hole (11b) and fixed by welding. The upper part of the pipeline support plate (4) is a semi-circular arc groove adapted to the outer diameter of the pipeline to be processed, and the bottom is adapted to the shape of the second positioning hole (11b).

8. The welding fixture according to claim 1, characterized in that, The multi-point intelligent measurement system sampling device includes at least two interconnected pipelines, and the flange fixing plate (2) and the flange support plate (3) are of the same number and at least two of each.

9. The welding fixture according to claim 8, characterized in that, The welding fixture also includes at least one multi-groove pipe support plate (4a), which is inserted into the base plate (1) through a third positioning hole (11c) and fixed by welding.

10. The welding fixture according to claim 9, characterized in that, The upper part of the multi-groove pipeline support plate (4a) is provided with at least two semi-circular arc-shaped grooves adapted to the outer diameter of the pipeline to be processed and several flange positioning holes (4a1) distributed near the semi-circular arc-shaped grooves, and the bottom is shaped to adapt to the third positioning hole (11c).

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