Plate type flat welding flange

Abstract

The invention relates to the technical field of flat welding flanges, in particular to a plate type flat welding flange which comprises a flange plate, an inner hole used for being connected with a pipeline in an inserted mode is formed in the flange plate, a plurality of bolt holes used for connection are evenly distributed in the circumference of the flange plate, and a positioning assembly is further arranged on the flange plate and comprises a plurality of positioning grooves formed in the flange plate. The multiple positioning grooves are evenly distributed in the flange plate in the circumferential direction, positioning blocks are horizontally installed in the positioning grooves in a sliding mode, a positioning spring is further horizontally arranged in each positioning groove, and the positioning springs are used for keeping pushing the positioning blocks towards the circle center direction of the inner hole. Through the positioning spring and the positioning block of the positioning assembly, the pipeline is automatically pushed to the center of the flange plate after being inserted into the inner hole of the flange plate, so that the axis of the pipeline coincides with the axis of the flange plate, and the problem that the axis of the pipeline is not coaxial with the axis of the flange plate when the pipeline is smaller than the inner hole of the flange plate is solved; and the welding effect of the flange plate and the pipeline is improved.

Description

Technical Field

[0001] The invention relates to the technical field of flat welding flanges, in particular to a plate type flat welding flange. Background Art

[0002] Slip-on flange refers to a flange that is connected to a container or pipe using a fillet weld. Slip-on flange is a type of flange that is widely used in the connection of medium and low pressure containers and pipes. Plate type slip-on flange is also a type of slip-on flange.

[0003] During the welding process of the plate-type flat-weld flange, the pipe must be inserted into the inner hole of the flat-weld flange before the flange and the pipe are welded together. However, during the welding process of the existing flat-weld flange, the inner holes of some pipes and flanges are not completely matched, that is, the outer diameter of some pipes is smaller than the inner hole diameter of the flange. After the pipe is inserted into the inner hole of the flange, there is a gap between the outer wall of the pipe and the inner hole of the flange. In order to keep the position between the pipe and the flange unchanged during the welding process, it is necessary to first spot weld the flange and the pipe before welding can begin. Because there is a gap between the inner hole of the pipe and the flange, it is difficult to manually make the inner hole of the pipe and the flange coaxial when the pipe and the flange are spot welded. After the welding is completed, if the inner hole of the flange and the pipe is not coaxial, when the pipes are connected with flanges, the pipes cannot be aligned. In the process of transporting materials through the pipeline, the fluid inside the pipeline will impact the dislocated pipeline, which will easily cause the pipeline to leak from the connection position in the long run. If the pipelines cannot be aligned, the materials inside the pipeline will be blocked during the transportation process, and the transportation speed will also be reduced, affecting the transportation efficiency. Moreover, during the spot welding process of the pipeline, if there is a gap between the inner hole of the pipeline and the flange, the pipeline is prone to tilt during spot welding. After long-term use, the welding point between the pipeline and the flange is also prone to stress and damage.

[0004] In order to solve the above problems, the Chinese utility model patent with application number: CN202022007768.5 and titled "A Plate Slip-On Flange" proposed a solution, which provides a fixing ring and a ring groove, so that when the pipe is inserted into the plate slip-on flange, the pipe insertion end can be fixed in the groove of the fixing ring, and the rubber gasket makes the contact between the pipe insertion end and the fixing ring closer and the fixation more stable, so that the welding between the pipe and the plate slip-on flange will be smoother. To a certain extent, it solves the problem of crooked welding when the pipe is fixed by spot welding.

[0005] However, in the solution, the fixing ring is hooked into the inside of the pipeline to fix the pipeline, and the fixing ring occupies the internal space of the pipeline, which will cause the flow cross-section of the pipeline to become smaller and reduce the transportation efficiency of the pipeline.

[0006] Therefore, a plate-type flat welding flange is proposed. Summary of the invention

[0007] The object of the present invention is to provide a plate-type flat-weld flange which does not occupy the internal space of the pipeline, ensures the pipeline transportation efficiency and solves the problem of misalignment between the pipeline and the flange during welding proposed in the above-mentioned background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A plate-type flat-weld flange comprises a flange, wherein the two ends of the flange are respectively a welding surface and a connecting surface, the connecting surface is used to dock with another flange, the flange is provided with an inner hole for plugging into a pipe, the flange is circumferentially evenly provided with a plurality of bolt holes for connection, the flange is also provided with a positioning assembly, the positioning assembly comprises a plurality of positioning grooves provided on the welding surface of the flange, the plurality of positioning grooves are circumferentially evenly distributed on the flange, and the positioning grooves are all connected with the inner hole, positioning blocks are horizontally slidably installed inside the positioning grooves, and a positioning spring is also horizontally provided inside each of the positioning grooves, and the positioning spring is used to keep the positioning block pushed toward the center of the inner hole.

[0010] When the pipe is inserted into the inner hole of the flange, multiple positioning springs of the same specification simultaneously push the positioning block toward the axis of the inner hole. The positioning block contacts the outer wall of the pipe and pushes the pipe, so that the pipe is pushed to the center of the inner hole and is coaxial with the inner hole, thereby improving the coaxiality of the welding between the pipe and the flange, improving the welding effect of the pipe and the flange, and ultimately improving the use effect of the pipe and the flange.

[0011] The positioning spring and the positioning block clamp and position the pipe during welding, which can also facilitate the workers' welding operation. There is no need to set up additional clamps to fix the pipe during welding, which helps to improve the welding efficiency between the pipe and the flange.

[0012] Preferably, in order to ensure the connection effect between the positioning block and the pipe when the pipe and the flange are spot welded, the material of the positioning block is the same as that of the flange. An inclined guide portion is provided on the top of the positioning block, and the guide portion is inclined downward in the direction of the connection surface. The guide portion is provided to facilitate the insertion of the pipe into the inner hole of the flange. After the bottom of the pipe squeezes the guide portion, the pipe can automatically squeeze the positioning block away from the axis of the inner hole, without manually pulling the positioning spring to drive the positioning block to avoid the pipe, so as to facilitate the insertion of the pipe into the inner hole.

[0013] Preferably, a plurality of reinforcing grooves for increasing the welding contact area are formed on the welding surface of the flange. The reinforcing grooves are circumferentially distributed along the outer edge of the inner ring, and all the reinforcing grooves communicate with the inner hole. During the welding process, the plurality of reinforcing grooves can increase the contact area between the melted welding material and the flange, thereby improving the connection strength between the welding material and the flange, preventing the pipeline from detaching from the flange, and further enhancing the welding strength between the flange and the pipeline.

[0014] Preferably, an annular groove is coaxially formed on the inner hole. The annular groove is located below the reinforcing groove and communicates with the inner hole. All the reinforcing grooves communicate with the annular groove. A guiding component is further arranged inside the annular groove, and the guiding component is used for guiding the molten metal liquid after the electrode is melted towards the inside of the annular groove.

[0015] The arrangement of the annular groove enables the molten welding material to flow into the annular groove when flowing downward along the reinforcing groove. After the molten welding material cools and hardens inside the annular groove, it is connected to the annular groove, increasing the connection surface between the welding material and the flange. In addition, the hardened welding material forms a "匚"-shaped structure, and the "匚"-shaped weld can hold the flange, further preventing the welding material from falling off the weld due to vibration during use and ensuring the stability of the connection between the pipeline and the flange.

[0016] The guiding component guides the molten welding material flowing downward along the outer wall of the pipeline towards the annular groove, preventing the welding material from flowing downward along the pipeline to the bottom of the pipeline and dripping, which causes waste. It also ensures that all the welding material can enter the annular groove to fill the annular groove, improving the connection effect between the welding material and the flange, and further enhancing the welding strength and stability between the pipeline and the flange.

[0017] Preferably, the cross-sectional shape of the guiding part of the positioning block is triangular. One edge of the triangular guiding part is arranged upward along the axis of the inner hole. The cross-section of the guiding part gradually narrows towards the axis of the inner hole and forms a tapered part at the front end. The hardness of the tapered part is greater than that of the flange. The guiding part with a triangular cross-section can reduce the contact area between the guiding part and the pipeline when the pipeline is inserted into the inner hole, thereby reducing the resistance when the pipeline is inserted into the inner hole and facilitating the insertion of the pipeline into the inner hole. In addition, during the process of inserting the pipeline into the inner hole, the tapered part can scratch the outer wall of the pipeline to remove the oxide layer on the outside of the pipeline and form new scratches, enabling the welding material to be stably connected to the matrix of the pipeline rather than the oxide layer of the pipeline. During the welding process between the pipeline and the flange, the scratches on the outer wall of the pipeline increase the connection strength between the molten welding material and the outer wall of the pipeline.

[0018] Preferably, the guiding component includes a diversion ring horizontally installed at the bottom of the annular groove. The diversion ring is a thin sheet made of elastic metal. The outer diameter of the diversion ring is larger than the diameter of the inner hole and smaller than the diameter of the annular groove, and the inner diameter of the diversion ring is smaller than the diameter of the inner hole.

[0019] The thin sheet made of elastic metal has a certain extension effect and deformation effect, which can be better inserted into the ring groove. The inner ring diameter of the guide ring is smaller than the diameter of the inner hole to ensure that the inner ring of the guide ring can contact the outer wall of the pipe. After the pipe is inserted into the inner hole, the pipe also squeezes the inner ring of the guide ring downward, and finally the pipe makes the inner ring of the guide ring bend downward and expand the guide ring. The guide ring contacts the outer wall of the pipe and closes the gap between the pipe and the inner hole from the bottom of the ring groove, ensuring that the molten welding material will not continue to flow downward from the gap between the inner hole and the pipe, and the guide ring guides the molten welding material to the inside of the ring groove to ensure that the molten welding material solidifies at the ring groove.

[0020] The guide ring can also assist in positioning the pipe in conjunction with the positioning block, so that the axis of the pipe remains as parallel to the axis of the inner hole as possible, avoiding the skew between the pipe and the flange after welding, and helping to improve the welding effect between the pipe and the flange.

[0021] The outer ring diameter of the guide ring is larger than the inner hole diameter but smaller than the ring groove diameter because the guide ring will limit the pipe after the pipe is inserted into the inner ring of the guide ring. At this time, if the guide ring has been fixed and the center of the guide ring does not coincide with the axis of the inner hole, the pipe axis and the axis of the inner hole will not be aligned. When the outer ring diameter of the guide ring is larger than the inner hole diameter but smaller than the ring groove diameter, the guide ring can slide inside the ring groove. In this way, after the pipe is inserted into the inner hole of the guide ring, the pipe can also be adjusted under the push of the positioning spring and the positioning block, thereby ensuring that the axis of the pipe can coincide with the axis of the inner hole, ensuring the welding effect between the pipe and the flange.

[0022] Preferably, a plurality of elastic plates are arranged at the outer edge of the top of the guide ring, and the plurality of elastic plates are evenly distributed on the guide ring. The elastic plate is an upwardly protruding arc-shaped plate, one end of the elastic plate is fixed on the guide ring, and the other end is a free end. The top of the elastic plate abuts against the top of the annular groove and presses the guide ring toward the bottom of the annular groove. The elastic plate helps to press and fix the outer edge of the guide ring, and prevents the outer edge of the guide ring from being deformed when the pipeline passes through the inner hole of the guide ring, thereby preventing the guide ring from detaching from the annular groove. It helps to improve the stability of the guide ring during use.

[0023] In addition, the elastic plate presses the outer edge of the guide ring against the bottom of the ring groove, which helps to seal the ring groove during use after the pipeline and the flange are welded, preventing the material transported by the pipeline from entering the ring groove and contacting the welding position, and preventing the material transported by the pipeline from corroding and wearing the welding joint, thereby helping to avoid leakage at the welding joint between the pipeline and the flange, and improving the safety and stability of the flange during use.

[0024] Preferably, a sealing piece is fixedly installed at the bottom of the diversion ring. The sealing piece is made of silicone rubber material and covers the entire bottom of the diversion ring. The sealing piece can seal the annular groove during the use of the flange and the pipeline, preventing the materials transported by the pipeline from entering the annular groove to erode the weld seam, further avoiding leakage at the connection between the pipeline and the flange, and ensuring the connection strength and sealing performance between the pipeline and the flange.

[0025] The silicone rubber material is used because the silicone rubber material has good sealing performance and can withstand high temperatures of 350°C for a short time. After the molten welding material enters the annular groove, the welding material may come into contact with the diversion ring. After the molten welding material contacts the flange, it will cool down quickly. The high temperature tolerance performance can ensure that the sealing piece will not be melted within a short time.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] 1. For the flat welding plate flange described in the present invention, compared with the existing flat welding plate flange, a positioning component is provided. Through the positioning spring and positioning block of the positioning component, the pipeline is automatically pushed to the center of the flange after being inserted into the inner hole of the flange, making the axis of the pipeline coincide with the axis of the flange, avoiding the problem of non-coaxiality between the pipeline axis and the flange axis when the pipeline is smaller than the inner hole of the flange, ensuring the welding effect between the flange and the pipeline, and not affecting the conveying efficiency of the pipeline.

[0028] 2. For the flat welding plate flange described in the present invention, compared with the existing flat welding plate flange, a plurality of strengthening grooves are also provided around the inner hole of the flange. During the welding process, the plurality of strengthening grooves can increase the contact area between the melted welding material and the flange, thereby improving the connection strength between the welding material and the flange, preventing the pipeline from detaching from the flange, and further improving the welding strength between the flange and the pipeline.

[0029] 3. For the flat welding plate flange described in the present invention, compared with the existing flat welding plate flange, an annular groove is also provided below the strengthening groove, and the strengthening groove is communicated with the annular groove, so that the molten welding material can flow into the annular groove when flowing down along the strengthening groove. After the molten welding material cools and hardens in the annular groove, it is connected to the annular groove, increasing the connection surface between the welding material and the flange. In addition, the hardened welding material forms a "C" shape, further preventing the welding material from falling off the weld due to vibration during use, and ensuring the stability of the connection between the pipeline and the flange. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0031] Figure 2 is a top view of the present invention;

[0032] Figure 3 For the present invention Figure 1 Sectional view at AA in the middle;

[0033] Figure 4 For the present invention Figure 3 The enlarged view of point B in the middle;

[0034] Figure 5 It is a schematic diagram of the internal structure when the pipe is inserted into the inner hole of the flange in the present invention;

[0035] Figure 6 This is a schematic diagram of the internal structure after the pipe and the flange are welded in the present invention;

[0036] Figure 7 This is a schematic diagram of the structure after the pipeline and the positioning block are spot welded in the present invention;

[0037] Figure 8 It is a schematic diagram of the three-dimensional structure after the pipeline and the flange are welded in the present invention;

[0038] Fig. 9 Schematic diagram of the three-dimensional structure of the positioning block and the positioning spring in the present invention

[0039] Fig.10 It is a schematic diagram of the three-dimensional structure of the guide ring in the present invention.

[0040] In the figure: 1. flange; 2. inner hole; 3. bolt hole; 4. positioning groove; 5. positioning block; 6. positioning spring; 7. guide part; 8. reinforcement groove; 9. ring groove; 10. pointed cone part; 11. guide ring; 12. elastic plate; 13. sealing sheet; 14. fillet; 15. crack; 16. first welding point; 17. second welding point; 18. third welding point; 19. pipeline; 20. welding surface; 21. connecting surface; 22. fourth welding point; 23. avoidance gap; A1. insertion direction. DETAILED DESCRIPTION

[0041] See also Figures 1 to 10 The present invention provides a plate-type flat welding flange, and the technical solution is as follows:

[0042] A plate type flat welding flange, reference Figures 1 to 4, including a flange 1, the flange 1 is divided into a welding surface 20 and a connecting surface 21 for docking with another flange, an inner hole 2 for plugging with a pipe 19 is provided on the flange 1, eight bolt holes 3 for connection are evenly distributed on the circumference of the flange 1, and a positioning component is also provided on the flange 1, the positioning component includes four positioning grooves 4 opened on the welding surface 20 of the flange 1, the four positioning grooves 4 are evenly distributed on the circumference of the flange 1, and the positioning grooves 4 are all connected with the inner hole 2, and positioning blocks 5 are horizontally slidably installed inside the positioning grooves 4. The material of the positioning block 5 is the same as that of the flange 1, and an inclined guide portion 7 is provided on the top of the positioning block 5, and the guide portion 7 is inclined downward toward the connecting surface 21. The cross-sectional shape of the guide portion 7 of the positioning block 5 is a triangle, the bottom of the triangular positioning block 5 is a plane, one of the edges of the triangular guiding portion 7 is arranged upward along the axis direction of the inner hole 2, the cross-sectional area of ​​the guiding portion 7 gradually decreases toward the axis direction of the inner hole 2 and forms a pointed cone portion 10 at the front end, the pointed cone portion 10 is quenched to make the hardness of the pointed cone portion 10 greater than the hardness of the flange 1, and the hardness of the pointed cone portion 10 can also be made greater than the hardness of the flange 1 by replacing the material of the pointed cone portion 10. A positioning spring 6 is also horizontally arranged inside each positioning groove 4, and the positioning spring 6 keeps pushing the positioning block 5 toward the center of the inner hole 2.

[0043] refer to Figures 1 to 4 as well as Fig.10 , a plurality of reinforcing grooves 8 for increasing the welding contact area are provided on the welding surface 20 of the flange 1, and the reinforcing grooves 8 are evenly distributed on the outer edge of the inner ring, and the reinforcing grooves 8 are all connected to the inner hole 2. A coaxial annular ring groove 9 is provided on the inner hole 2, and the annular groove 9 is located below the reinforcing groove 8, and the annular groove 9 is connected to the inner hole 2, and the reinforcing grooves 8 are all connected to the annular groove 9. A guide assembly is also provided inside the annular groove 9, and the guide assembly includes a guide ring 11 horizontally installed at the bottom of the annular groove 9, and the guide ring 11 is made of elastic metal. In this embodiment, spring steel is selected as the material of the guide ring 11, and the outer ring diameter of the guide ring 11 is larger than the diameter of the inner hole 2 and smaller than the diameter of the annular groove 9, and the inner ring diameter of the guide ring 11 is smaller than the diameter of the inner hole 2. In this embodiment, the inner ring diameter of the guide ring 11 is 10 mm smaller than the diameter of the inner hole 2, and the outer ring diameter of the guide ring 11 is also 10 mm smaller than the diameter of the annular groove 9, so as to ensure that the guide ring 11 can have a certain sliding space inside the annular groove 9.

[0044] According to the setting of the above-mentioned guide ring 11, when the guide ring 11 is coaxial with the inner hole 2, the distance between the inner ring of the guide ring 11 and the inner wall of the inner hole 2 is 5 mm. When the outer diameter of the pipe 19 is greater than 5 mm from the inner wall of the inner hole 2, it is recommended to replace the flange 1 with other specifications to avoid the connection strength between the pipe 19 and the flange 1 being reduced due to too large a weld.

[0045] In addition, the inner ring of the guide ring 11 is also provided with a rounded corner 14 to facilitate the guidance of the pipe 19 when the pipe 19 is inserted, so as to facilitate the insertion of the pipe 19 into the inner ring of the guide ring 11. Figure 4 When the positioning spring 6 is in a natural state, the tip of the pointed cone 10 coincides with the inner ring of the guide ring 11 in the vertical direction.

[0046] refer to Figure 4 and Fig.10 , a plurality of elastic plates 12 are also arranged at the outer edge of the top of the guide ring 11, and the plurality of elastic plates 12 are evenly distributed on the guide ring 11 around the circumference. The elastic plates 12 are arc-shaped plates that bulge upward, and one end of the elastic plate 12 is fixed on the guide ring 11, and the other end is a free end. The top of the elastic plate 12 abuts against the top of the annular groove 9 and presses the guide ring 11 toward the bottom of the annular groove 9. When setting, the width of the elastic plate 12 is greater than the width of the reinforcement groove 8 to ensure that the elastic plate 12 will not be stuck in the reinforcement groove 8. A sealing sheet 13 is also fixedly installed at the bottom of the guide ring 11. The sealing sheet 13 is made of silicone rubber material and covers the entire bottom of the guide ring 11.

[0047] When using, refer to Figure 5 , place the flange 1 horizontally on the workbench, and let the side of the flange 1 with the reinforcement groove 8 face up. Then, pick up the pipe 19 to be welded with the flange 1, and insert it from the top of the flange 1 to the inner hole 2 of the flange 1 along the insertion direction A1. When the bottom of the pipe 19 is inserted, it will squeeze the edge of the top of the guide part 7 on the positioning block 5. As the pipe 19 is squeezed, the pipe 19 will give the positioning block 5 a horizontal component force, which will squeeze the positioning spring 6 so that the positioning spring 6 shrinks in the horizontal direction, and the positioning block 5 will avoid the pipe 19, and then the pipe 19 can be inserted into the inner hole 2. When the bottom end of the pipe 19 passes over the bottom of the positioning block 5, the pointed cone 10 on the guide part of the positioning block 5 will continue to press against the outer wall of the pipe 19 because the positioning spring 6 continues to give the positioning block 5 an elastic force. At this time, the pipe 19 can be pressed down while rotating the pipe 19, which helps to facilitate the continued insertion of the pipe 19. During the insertion of the pipe 19, since the pointed cone portion 10 is always pressed against the outer wall of the pipe 19 under the push of the positioning spring 6, the pointed cone portion 10 will scratch the outer wall of the pipe 19, causing scratches on the outer wall of the pipe 19. If the pipe 19 is rotated and inserted, spiral scratches will appear, which will help improve the adhesion of the molten welding material to the outer wall of the pipe 19 during welding, thereby improving the strength of the welding.

[0048] When the bottom of the pipe 19 abuts against the guide ring 11, refer to Figure 5The bottom of the pipe 19 begins to squeeze the area of ​​the guide ring 11 close to the inner ring. The guide ring 11 bends downward under the squeezing of the pipe 19 and is deformed and expanded by the pipe 19, while the position of the guide ring 11 close to the outer ring area is pressed to the bottom of the annular groove 9 by the elastic plate 12 to prevent the guide ring 11 from falling off from the annular groove 9.

[0049] In addition, refer to Fig.10 In order to facilitate the inner ring part of the guide ring 11 to be expanded by the pipe 19 and facilitate the pipe 19 to pass through the inner ring of the guide ring 11, a plurality of cracks 15 can be evenly distributed along the diameter direction of the guide ring 11 in the inner ring part of the guide ring 11. At this time, it should be noted that the width of the crack 15 should be less than 1 mm to reduce the flow of molten welding material from the crack 15.

[0050] In order to facilitate the placement of the guide ring 11 into the annular groove 9, an avoidance slit 23 can be opened on the guide ring 11 to allow the guide ring 11 to be disconnected from the avoidance slit 23. In this way, the guide ring 11 can be placed into the annular groove 9 like a retaining spring.

[0051] When the pipe 19 passes through the guide ring 11, refer to Figure 5 , so that the bottom of the pipe 19 is flush with the bottom of the flange 1. At this time, if the pipe 19 is light, the pipe 19 is pushed toward the axis of the flange 1 by the positioning spring 6 and the positioning block 5, so that the axis of the pipe 19 coincides with the axis of the flange 1. If the pipe 19 is heavy, then under the action of the positioning spring 6 and the positioning block 5, the flange 1 will be driven by the elastic force of the positioning spring 6, so that the axis of the flange 1 coincides with the axis of the pipe 19.

[0052] refer to Figure 6 , Figure 7 and Figure 8, after the position between the flange 1 and the pipe 19 is positioned, welding can be started, and the argon arc welding method is adopted during welding. First, spot welding is carried out at the position where the positioning block 5 contacts the pipe 19 to form the first welding joint 16, so that the pipe 19 and the positioning block 5 are fixed first. Subsequently, welding is carried out at the positioning groove 4 to form the second welding joint 17. After the second welding joint 17 is hardened by welding, the molten welding material seals the positioning groove 4, making the pipe 19 and the flange 1 completely fixed, and there is no relative movement between the pipe 19 and the flange 1. Subsequently, welding is carried out along the gap between the pipe 19 and the inner hole 2. This is the third welding joint 18, and the molten welding material flows downward along the gap between the pipe 19 and the welding joint. The downward flowing molten welding material enters the inner part of the annular groove 9 under the action of the drainage ring. Moreover, when welding is carried out along the gap between the pipe 19 and the inner hole 2, the molten welding material will also enter the reinforcing groove 8 and flow downward along the reinforcing groove 8 into the inner part of the annular groove 9. When the molten welding material is hardened, a weld seam in the shape of a "匚" can be formed, which can effectively prevent the welding material from detaching from the flange 1 and ensure the stability of the welding between the flange 1 and the pipe 19. It should be noted that during welding, it is necessary to ensure that each reinforcing groove 8 is sealed by the welding material.

[0053] After the welding at the welding surface 20 is completed, it is also necessary to weld the gap between the pipe 19 and the inner hole 2 again at the connecting surface 21 to form an annular fourth welding joint 22.

[0054] So far, the whole welding process between the pipe 19 and the flange 1 has been completed.

[0055] The above has described in detail a specific implementation manner of the present invention in conjunction with the drawings, but the present invention is not limited to the above-described implementation manner. For those skilled in the art, without departing from the principles and ideas of the present invention, various changes, modifications, substitutions, and variations made to these implementation manners should still fall within the protection scope of the present invention.

Claims

1. A plate type flat welding flange, characterized in that: The invention comprises a flange (1), wherein the two ends of the flange (1) are respectively a welding surface (20) and a connecting surface (21); the flange (1) is provided with an inner hole (2) for plugging with a pipe (19); the flange (1) is provided with a plurality of bolt holes (3) evenly distributed around the circumference; the flange (1) is also provided with a positioning assembly, wherein the positioning assembly comprises a plurality of positioning grooves (4) provided on the welding surface (20) of the flange (1); the plurality of positioning grooves (4) are evenly distributed around the circumference of the flange (1); the positioning grooves (4) are all connected to the inner hole (2); positioning blocks (5) are horizontally slidably installed inside the positioning grooves (4); a positioning spring (6) is also horizontally provided inside each positioning groove (4); the positioning spring (6) is used to keep the positioning block (5) pushed toward the center of the inner hole (2).

2. A plate type flat welding flange according to claim 1, characterized in that: The material of the positioning block (5) is the same as that of the flange (1), and an inclined guide portion (7) is provided on the top of the positioning block (5), wherein the guide portion (7) is inclined downward in the direction of the connection surface (21).

3. A plate type flat welding flange according to claim 1, characterized in that: A plurality of reinforcement grooves (8) for increasing the welding contact area are provided on the welding surface (20) of the flange (1); the reinforcement grooves (8) are evenly distributed around the circumference of the outer edge of the inner ring, and the reinforcement grooves (8) are all connected to the inner hole (2).

4. A plate type flat welding flange according to claim 3, characterized in that: The inner hole (2) is provided with a coaxial annular annular groove (9), the annular groove (9) is located below the reinforcing groove (8), the annular groove (9) is in communication with the inner hole (2), the reinforcing grooves (8) are in communication with the annular groove (9), and a guide component is also provided inside the annular groove (9), the guide component is used to guide the molten metal of the welding rod toward the inside of the annular groove (9).

5. A plate type flat welding flange according to claim 2, characterized in that: The cross-sectional shape of the guide portion (7) of the positioning block (5) is triangular, one of the edges of the triangular guide portion (7) is arranged upward along the axial direction of the inner hole (2), the cross-sectional shape of the guide portion (7) gradually decreases toward the axial direction of the inner hole (2) and forms a pointed cone portion (10) at the front end, and the hardness of the pointed cone portion (10) is greater than the hardness of the flange (1).

6. A plate type flat welding flange according to claim 4, characterized in that: The guide assembly comprises a guide ring (11) horizontally mounted at the bottom of the annular groove (9); the guide ring (11) is made of elastic metal; the outer ring diameter of the guide ring (11) is larger than the diameter of the inner hole (2) but smaller than the diameter of the annular groove (9); and the inner ring diameter of the guide ring (11) is smaller than the diameter of the inner hole (2).

7. A plate type flat welding flange according to claim 6, characterized in that: A plurality of elastic plates (12) are arranged at the outer edge of the top of the guide ring (11). The plurality of elastic plates (12) are evenly distributed on the circumference of the guide ring (11). The elastic plates (12) are arc-shaped plates protruding upward. One end of the elastic plate (12) is fixed on the guide ring (11), and the other end is a free end. The top of the elastic plate (12) abuts against the top of the annular groove (9) and presses the guide ring (11) toward the bottom of the annular groove (9).

8. A plate type flat welding flange according to claim 6, characterized in that: A sealing sheet (13) is fixedly mounted on the bottom of the guide ring (11); the sealing sheet (13) is made of a silicone rubber material; and the sealing sheet (13) covers the entire bottom of the guide ring (11).

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