Metal pipeline flange and welding jig
By designing the welding cavity angle of the outer chamfer and the inner chamfer and the inner and outer rubber sealing rings on the metal pipe flange, combined with the support components of the welding fixture, the defects such as insufficient penetration, air holes, and slag inclusion during the welding of metal pipe flanges are solved, and the welding strength and sealing are improved.
Patent Information
- Application Number
- CN202510791871.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-13
- Publication Date
- 2025-09-19
AI Technical Summary
Existing metal pipe flange welding is prone to defects such as insufficient penetration, porosity, and slag inclusion, resulting in low connection strength and poor sealing, and weld offset leading to stress concentration.
Design metal pipe flanges and welding fixtures, use external chamfers and internal chamfers to form a welding cavity angle of 20-50°, set internal and external rubber sealing rings and piston devices, use argon arc welding primer and manual arc welding filling process, combined with adjustable support components to ensure coaxiality.
Improve welding quality and efficiency, ensure weld penetration ≥3mm, enhance sealing effect, prevent medium leakage, improve welding strength and sealing performance, and solve the problem of poor coaxiality during welding.
Smart Images
Figure CN120667590A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of pipeline flanges, and in particular relates to a metal pipeline flange and a welding jig. Background Art
[0002] Metal pipe flanges play a key role in pipeline systems. First, they are important components for connecting pipelines. Bolts and other fasteners tightly connect two or more sections of pipelines to form a continuous and stable transmission channel, ensuring that fluids (such as gas and liquid) can pass smoothly. Second, flanges facilitate the installation, disassembly and maintenance of pipelines. When a part of the pipeline fails, the flange bolts can be loosened to quickly separate the faulty section for repair or replacement without large-scale damage to the overall structure of the pipeline, greatly improving maintenance efficiency and reducing repair costs and difficulty. During existing flange welding, defects such as insufficient penetration, porosity, and slag inclusion are prone to occur in the weld, resulting in low connection strength and poor sealing. During existing welding, the coaxiality between the pipe head and the flange ring is poor, resulting in weld deviation and stress concentration. Therefore, a metal pipe flange and a welding jig are proposed. Summary of the Invention
[0003] In view of the shortcomings of the above background technology, an object of the present invention is to provide a metal pipe flange and a welding jig.
[0004] In order to solve the above-mentioned technical problems, the purpose of the present invention is achieved as follows: A metal pipe flange and a welding jig include a first pipe flange and a second pipe flange. The first pipe flange and the second pipe flange both include a pipe head and a flange ring. The inner periphery of one side of the flange ring is sleeved on the outer periphery of one end of the pipe head. An outer chamfer is provided on the outer periphery of the end of the pipe head close to the flange ring. An inner chamfer is provided on the inner diameter of one side of the flange ring. A welding cavity angle of 20-50° is formed between the outer chamfer and the inner chamfer for the entry of a welding rod. The inner chamfer of the flange ring is connected to the outer chamfer of the pipe head by welding with a welding rod.
[0005] On the basis of the above solution and as a preferred solution of the above solution: the first pipe flange and the second pipe flange are arranged opposite to each other, and corresponding first annular sealing grooves are formed on the facing butt joint surfaces of the flange ring of the first pipe flange and the flange ring of the second pipe flange, a second annular sealing groove is formed on the flange ring and located on the inner periphery of the first annular sealing groove, and a rubber sealing ring corresponding to the first annular sealing groove and the second annular sealing groove is provided between the first pipe flange and the second pipe flange; The rubber sealing ring consists of an inner rubber ring and an outer rubber ring. The inner rubber ring is located on the inner periphery of the outer rubber ring, and a cavity for inflation is opened inside the inner rubber ring and the outer rubber ring. The inner rubber ring and the outer rubber ring of the rubber sealing ring are embedded in the first annular sealing groove and the second annular sealing ring groove of the first pipe flange, and are glued and fixed to the first annular sealing groove and the second annular sealing ring groove.
[0006] On the basis of the above scheme and as a preferred scheme of the above scheme: a piston device is provided on the top of the pipe head of the first pipe flange, the piston device includes a piston sleeve, the bottom of the piston sleeve is welded and fixed to the pipe head of the first pipe flange, one end of the piston sleeve is connected to a metal tube, the end of the metal tube away from the piston sleeve is connected to a hose, and the hose is passed through the pipe head and the inner wall of the flange ring of the first pipe flange and is connected to the cavity of the inner rubber ring and the outer rubber ring, and the pipe head and the inner wall of the flange ring of the first pipe flange are provided with perforations corresponding to the hose.
[0007] On the basis of the above scheme and as the preferred scheme of the above scheme: an internal threaded plate is welded inside the piston sleeve, a screw is inserted into the central thread of the internal threaded plate, the end of the screw close to the metal tube is connected to the piston head, the end of the screw away from the piston head is connected to a limiting block, a hexagonal hole is provided on the side of the limiting block away from the screw, and a protective cap is provided on the threaded cover at the end of the piston sleeve away from the metal tube.
[0008] A welding jig for metal pipe flanges includes a frame, with a pipe head support assembly for supporting the pipe head and a flange support assembly for supporting the flange ring respectively provided at both ends of the top of the frame, a first threaded rod and a second threaded rod for adjusting the height respectively provided at the bottom of the pipe head support assembly and the flange support assembly, the first threaded rod and the second threaded rod are respectively connected to the frame through threads, and hand wheels are provided at the bottom of the first threaded rod and the second threaded rod.
[0009] On the basis of the above scheme and as a preferred scheme of the above scheme: the pipe head support assembly includes a first lifting plate, and roller seats are symmetrically arranged on both sides of the top of the first lifting plate. Rollers for supporting both sides of the bottom of the pipe head are rotatably installed in the roller seats through bearings.
[0010] On the basis of the above scheme and as a preferred scheme of the above scheme: the flange support assembly includes a second lifting plate, a support plate is connected to one side of the top of the second lifting plate, the support plate is provided with adjustment grooves at equal distances along the center of the circle, at least one group of adjustment grooves is provided, and a pressure roller for limiting the outer periphery of the flange ring is provided on one side of the adjustment groove, one end of the pressure roller is rotatably connected to a screw sleeve with a threaded outer periphery through a bearing, the screw sleeve passes through the adjustment groove, the screw sleeve is provided with an internal threaded sleeve, the diameter of the internal threaded sleeve is greater than the width of the adjustment groove, and handles are provided on both sides of the internal threaded sleeve; The bottoms of the first lifting plate and the second lifting plate are both welded with guide rods, and the guide rods are inserted through the frame.
[0011] A method for welding a metal pipe flange, the specific steps are as follows: Step 1: Support assembly adjustment: Rotate the handwheel to drive the first threaded rod and the second threaded rod to adjust the height of the first lifting plate and the second lifting plate respectively, so that the roller height of the adjusted pipe head support assembly and the pressure roller position of the flange support assembly match the outer diameter of the pipe head to be welded and the outer circumference of the flange ring, ensuring the coaxial state of the pipe head and the flange ring during welding; Step 2: Pipeline positioning and fixing: Place the flange ring between the pressure rollers of the support plate, move the position of the pressure rollers, and rotate the rotating screw sleeve to fix the use position of the pressure rollers, so that the radial direction of the pressure rollers is adjusted, and the pressure rollers clamp the outer circumference of the flange ring. Then place the pipe head on the roller so that the outer chamfer of the pipe head and the inner chamfer of the flange ring are kept in a coaxial plug-in state, that is, the pipe head and the flange ring are positioned before welding using a welding jig; Step 3: Welding execution: The welding cavity angle formed between the outer chamfer and the inner chamfer is welded by argon arc welding for base and manual arc welding for filling, ensuring that the weld penetration is ≥3mm. During the welding process, the pressure roller and the roller can roll the turntable to rotate the pipe head and the flange ring until the welding cavity angle between the pipe head and the flange ring is welded and filled.
[0012] Compared with the prior art, the present invention has the following outstanding and beneficial technical effects: The pipe heads and flange rings of the first and second pipe flanges form a welding cavity angle of a specific angle through the outer chamfers and inner chamfers, providing good space for the entry of the welding rod, facilitating the welding operation, and improving the welding quality and efficiency, ensuring the weld penetration depth ≥3mm, and ensuring the welding strength. The flange rings of the first and second pipe flanges are provided with a first annular sealing groove and a second annular sealing ring groove on the facing butt joint surfaces, and a rubber sealing ring composed of an inner rubber ring and an outer rubber ring is provided. The inner rubber ring and the outer rubber ring are provided with an inflation cavity inside. The inflation can enhance the sealing effect, effectively prevent the leakage of the medium, and improve the sealing performance of the pipeline system. The rubber sealing ring is glued and fixed to the first and second annular sealing grooves, ensuring the stability and sealing of the sealing ring installation, and further improving the overall sealing effect. The setting of the piston device makes the inflation operation of the rubber sealing ring more convenient. By rotating the screw to drive the piston head to move, the external gas can be transported to the cavity of the rubber sealing ring through the metal pipe and the hose to realize the inflation control of the sealing ring. The setting of the protective cap can protect the end of the piston sleeve away from the metal pipe to prevent debris from entering, thereby improving the safety of operation. The welding jig is used to improve the versatility of this type of pipe flange welding processing. The pipe head support assembly and the flange support assembly of the welding jig can adjust the height through the first threaded rod and the second threaded rod respectively, which can adapt to pipe heads and flange rings of different sizes, ensure the coaxial state of the pipe head and flange ring during welding, and improve welding accuracy. The roller seat and roller of the pipe head support assembly can support both sides of the bottom of the pipe head and facilitate the rotation of the pipe head; the support plate, adjustment groove, pressure roller, screw sleeve and internal threaded sleeve of the flange support assembly can limit and fix the outer periphery of the flange ring, and the position of the pressure roller can be adjusted to facilitate clamping flange rings of different sizes, thereby improving the versatility and practicality of the welding jig and solving the problems of insufficient penetration, air holes and slag inclusion in the weld when welding existing flanges. Defects such as low connection strength and poor sealing are caused by designing external chamfers and internal chamfers on the pipe head and flange ring to form a welding cavity angle of 20-50°, providing a stable filling space for the welding rod, ensuring the weld penetration ≥3mm, improving welding strength, and the composite process of arc welding filling, further reducing welding defects, improving weld quality, and solving the problem of poor coaxiality between the pipe head and the flange ring during welding, which leads to weld offset and stress concentration. The pipe head and the flange ring are fixed respectively by the pipe head support assembly roller and the flange support assembly pressure roller, and the support height is adjusted by the first threaded rod and the second threaded rod to ensure that the pipe head and the flange ring are coaxial. The pressure roller can move radially along the adjustment groove to adapt to flange rings of different sizes, improve positioning accuracy, and effectively solve the above problems. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 Schematic diagram of the first pipe flange and the second pipe flange of the present invention; Figure 2 Schematic diagram of the pipe head and flange ring of the present invention; Figure 3 is a cross-sectional schematic diagram of the piston device of the present invention; Figure 4 This is a schematic structural diagram of the welding jig of the present invention; Figure 5 It is a schematic diagram of the pressure roller of the present invention; Figure 6 This is a schematic diagram of the positioning support for the pipeline flange according to the present invention; Figure 1: first pipe flange 11, second pipe flange 12, pipe head 101, flange ring 102, outer chamfer 103, inner chamfer 104, first annular sealing groove 13, second annular sealing ring groove 14, rubber sealing ring 15, piston device 16, piston sleeve 161, internal threaded plate 162, screw 163, piston head 164, limit block 165, hexagonal hole 166, protective cap 167, metal pipe 168, frame 21, pipe head support assembly 22, flange support assembly 23, first lifting plate 221, roller seat 222, roller 223, first threaded rod 224, second lifting plate 230, support plate 231, adjusting groove 232, pressure roller 233, screw sleeve 234, internal threaded sleeve 235, handle 236, second threaded rod 237. DETAILED DESCRIPTION
[0014] The present invention will be further described below with reference to specific embodiments in conjunction with the accompanying drawings; Example 1 As an embodiment of the present invention, Figures 1 to 6 As shown, a metal pipe flange and a welding jig of the present invention include a first pipe flange 11 and a second pipe flange 12. The first pipe flange 11 and the second pipe flange 12 both include a pipe head 101 and a flange ring 102. The inner periphery of one side of the flange ring 102 is sleeved on the outer periphery of one end of the pipe head 101. An outer chamfer 103 is provided on the outer periphery of one end of the pipe head 101 close to the flange ring 102. An inner chamfer 104 is provided on the inner diameter of one side of the flange ring 102. A 20° welding cavity angle is formed between the outer chamfer 103 and the inner chamfer 104 for the entry of the welding rod. The inner chamfer 104 of the flange ring 102 is connected to the outer chamfer 103 of the pipe head 101 by welding with a welding rod.
[0015] The present invention also includes that the first pipe flange 11 and the second pipe flange 12 are arranged facing each other, and the flange ring 102 of the first pipe flange 11 and the flange ring 102 of the second pipe flange 12 are both provided with corresponding first annular sealing grooves 13 on the facing surfaces thereof, a second annular sealing ring groove 14 is provided on the flange ring 102 and located on the inner periphery of the first annular sealing groove 13, and a rubber sealing ring 15 corresponding to the first annular sealing groove 13 and the second annular sealing ring groove 14 is provided between the first pipe flange 11 and the second pipe flange 12; The rubber sealing ring 15 consists of an inner rubber ring and an outer rubber ring. The inner rubber ring is located on the inner periphery of the outer rubber ring, and a cavity for inflation is provided inside the inner rubber ring and the outer rubber ring. The inner rubber ring and the outer rubber ring of the rubber sealing ring 15 are embedded in the first annular sealing groove 13 and the second annular sealing groove 14 of the first pipe flange 11, and are glued and fixed to the first annular sealing groove 13 and the second annular sealing groove 14.
[0016] The present invention also includes that a piston device 16 is provided on the top of the pipe head 101 of the first pipe flange 11, and the piston device 16 includes a piston sleeve 161. The bottom of the piston sleeve 161 is welded and fixed to the pipe head 101 of the first pipe flange 11, and a metal tube 168 is connected to one end of the piston sleeve 161. The end of the metal tube 168 away from the piston sleeve 161 is connected to a hose, and the hose is passed through the inner wall of the pipe head 101 and the flange ring 102 of the first pipe flange 11 and is connected to the cavity of the inner rubber ring and the outer rubber ring. The inner wall of the pipe head 101 and the flange ring 102 of the first pipe flange 11 is provided with a perforation corresponding to the hose.
[0017] The present invention also includes that an internal threaded plate 162 is welded inside the piston sleeve 161, a screw 163 is inserted into the central thread of the internal threaded plate 162, the end of the screw 163 close to the metal tube 168 is connected to the piston head 164, the end of the screw 163 away from the piston head 164 is connected to the limiting block 165, the side of the limiting block 165 away from the screw 163 is provided with an internal hexagonal hole 166, and the threaded cover at the end of the piston sleeve 161 away from the metal tube 168 is provided with a protective cap 167.
[0018] A welding jig for metal pipe flanges includes a frame 21, and two ends of the top of the frame 21 are respectively provided with a pipe head support assembly 22 for supporting the pipe head 101 and a flange support assembly 23 for supporting the flange ring 102. The bottoms of the pipe head support assembly 22 and the flange support assembly 23 are respectively provided with a first threaded rod 224 and a second threaded rod 237 for adjusting the height. The first threaded rod 224 and the second threaded rod 237 are respectively threadedly connected to the frame 21, and hand wheels are provided at the bottoms of the first threaded rod 224 and the second threaded rod 237.
[0019] The present invention also includes that the pipe head support assembly 22 includes a first lifting plate 221, and roller seats 222 are symmetrically arranged on both sides of the top of the first lifting plate 221. Rollers 223 for supporting both sides of the bottom of the pipe head 101 are rotatably installed in the roller seats 222 through bearings.
[0020] The present invention also includes that the flange support assembly 23 includes a second lifting plate 230, a support plate 231 is connected to one side of the top of the second lifting plate 230, and the support plate 231 is provided with adjustment grooves 232 at equal distances along the center of the circle, and at least one group of adjustment grooves 232 is provided. A pressure roller 233 for limiting the outer periphery of the flange ring 102 is provided on one side of the adjustment groove 232, and one end of the pressure roller 233 is rotatably connected to a screw sleeve 234 with a threaded outer periphery through a bearing. The screw sleeve 234 passes through the adjustment groove 232 and is threadedly provided with an internal threaded sleeve 235. The diameter of the internal threaded sleeve 235 is greater than the width of the adjustment groove 232, and handles 236 are provided on both sides of the internal threaded sleeve 235. The bottoms of the first lifting plate 221 and the second lifting plate 230 are both welded with guide rods, and the guide rods penetrate and are inserted into the frame 21 .
[0021] A method for welding a metal pipe flange, the specific steps are as follows: Step 1: Support assembly adjustment: Rotate the handwheel to drive the first threaded rod 224 and the second threaded rod 237 to adjust the height of the first lifting plate 221 and the second lifting plate 230 respectively, so that the height of the roller 223 of the pipe head support assembly 22 and the position of the pressure roller 233 of the flange support assembly 23 after adjustment match the outer diameter of the pipe head 101 to be welded and the outer circumference of the flange ring 102, ensuring the coaxial state of the pipe head 101 and the flange ring 102 during welding; Step 2: Positioning and fixing the pipeline: Place the flange ring 102 between the pressure rollers 233 of the support plate 231, move the position of the pressure roller 233, and rotate the rotating screw sleeve 234 to fix the use position of the pressure roller 233, so that the radial direction of the pressure roller 233 is adjusted, and the pressure roller 233 clamps the outer circumference of the flange ring 102, and then place the pipe head 101 on the roller 223, so that the outer chamfer 103 of the pipe head 101 and the inner chamfer 104 of the flange ring 102 maintain a coaxial plug-in state, that is, the pipe head 101 and the flange ring 102 are positioned before welding by using a welding jig; Step 3: Welding execution: The welding cavity angle formed between the outer chamfer 103 and the inner chamfer 104 is welded by argon arc welding for base and manual arc welding for filling, ensuring that the weld penetration is ≥3mm. During the welding process, the pressure roller 233 and the roller 223 can rotate the turntable to rotate the pipe head 101 and the flange ring 102 until the welding cavity angle between the pipe head 101 and the flange ring 102 is welded and filled.
[0022] Example 2 As an embodiment of the present invention, Figures 1 to 6 As shown, a metal pipe flange and a welding jig of the present invention include a first pipe flange 11 and a second pipe flange 12. The first pipe flange 11 and the second pipe flange 12 both include a pipe head 101 and a flange ring 102. The inner periphery of one side of the flange ring 102 is sleeved on the outer periphery of one end of the pipe head 101. An outer chamfer 103 is provided on the outer periphery of one end of the pipe head 101 close to the flange ring 102. An inner chamfer 104 is provided on the inner diameter of one side of the flange ring 102. A 50° welding cavity angle is formed between the outer chamfer 103 and the inner chamfer 104 for the entry of the welding rod. The inner chamfer 104 of the flange ring 102 is connected to the outer chamfer 103 of the pipe head 101 by welding with a welding rod.
[0023] The present invention also includes that the first pipe flange 11 and the second pipe flange 12 are arranged facing each other, and the flange ring 102 of the first pipe flange 11 and the flange ring 102 of the second pipe flange 12 are both provided with corresponding first annular sealing grooves 13 on the facing surfaces thereof, a second annular sealing ring groove 14 is provided on the flange ring 102 and located on the inner periphery of the first annular sealing groove 13, and a rubber sealing ring 15 corresponding to the first annular sealing groove 13 and the second annular sealing ring groove 14 is provided between the first pipe flange 11 and the second pipe flange 12; The rubber sealing ring 15 consists of an inner rubber ring and an outer rubber ring. The inner rubber ring is located on the inner periphery of the outer rubber ring, and a cavity for inflation is provided inside the inner rubber ring and the outer rubber ring. The inner rubber ring and the outer rubber ring of the rubber sealing ring 15 are embedded in the first annular sealing groove 13 and the second annular sealing groove 14 of the first pipe flange 11, and are glued and fixed to the first annular sealing groove 13 and the second annular sealing groove 14.
[0024] The present invention also includes that a piston device 16 is provided on the top of the pipe head 101 of the first pipe flange 11, and the piston device 16 includes a piston sleeve 161. The bottom of the piston sleeve 161 is welded and fixed to the pipe head 101 of the first pipe flange 11, and a metal tube 168 is connected to one end of the piston sleeve 161. The end of the metal tube 168 away from the piston sleeve 161 is connected to a hose, and the hose is passed through the inner wall of the pipe head 101 and the flange ring 102 of the first pipe flange 11 and is connected to the cavity of the inner rubber ring and the outer rubber ring. The inner wall of the pipe head 101 and the flange ring 102 of the first pipe flange 11 is provided with a perforation corresponding to the hose.
[0025] The present invention also includes that an internal threaded plate 162 is welded inside the piston sleeve 161, a screw 163 is inserted into the central thread of the internal threaded plate 162, the end of the screw 163 close to the metal tube 168 is connected to the piston head 164, the end of the screw 163 away from the piston head 164 is connected to the limiting block 165, the side of the limiting block 165 away from the screw 163 is provided with an internal hexagonal hole 166, and the threaded cover at the end of the piston sleeve 161 away from the metal tube 168 is provided with a protective cap 167.
[0026] A welding jig for metal pipe flanges includes a frame 21, and two ends of the top of the frame 21 are respectively provided with a pipe head support assembly 22 for supporting the pipe head 101 and a flange support assembly 23 for supporting the flange ring 102. The bottoms of the pipe head support assembly 22 and the flange support assembly 23 are respectively provided with a first threaded rod 224 and a second threaded rod 237 for adjusting the height. The first threaded rod 224 and the second threaded rod 237 are respectively threadedly connected to the frame 21, and hand wheels are provided at the bottoms of the first threaded rod 224 and the second threaded rod 237.
[0027] The present invention also includes that the pipe head support assembly 22 includes a first lifting plate 221, and roller seats 222 are symmetrically arranged on both sides of the top of the first lifting plate 221. Rollers 223 for supporting both sides of the bottom of the pipe head 101 are rotatably installed in the roller seats 222 through bearings.
[0028] The present invention also includes that the flange support assembly 23 includes a second lifting plate 230, a support plate 231 is connected to one side of the top of the second lifting plate 230, and the support plate 231 is provided with adjustment grooves 232 at equal distances along the center of the circle, and at least one group of adjustment grooves 232 is provided. A pressure roller 233 for limiting the outer periphery of the flange ring 102 is provided on one side of the adjustment groove 232, and one end of the pressure roller 233 is rotatably connected to a screw sleeve 234 with a threaded outer periphery through a bearing. The screw sleeve 234 passes through the adjustment groove 232 and is threadedly provided with an internal threaded sleeve 235. The diameter of the internal threaded sleeve 235 is greater than the width of the adjustment groove 232, and handles 236 are provided on both sides of the internal threaded sleeve 235. The bottoms of the first lifting plate 221 and the second lifting plate 230 are both welded with guide rods, and the guide rods penetrate and are inserted into the frame 21 .
[0029] A method for welding a metal pipe flange, the specific steps are as follows: Step 1: Support assembly adjustment: Rotate the handwheel to drive the first threaded rod 224 and the second threaded rod 237 to adjust the height of the first lifting plate 221 and the second lifting plate 230 respectively, so that the height of the roller 223 of the pipe head support assembly 22 and the position of the pressure roller 233 of the flange support assembly 23 after adjustment match the outer diameter of the pipe head 101 to be welded and the outer circumference of the flange ring 102, ensuring the coaxial state of the pipe head 101 and the flange ring 102 during welding; Step 2: Positioning and fixing the pipeline: Place the flange ring 102 between the pressure rollers 233 of the support plate 231, move the position of the pressure roller 233, and rotate the rotating screw sleeve 234 to fix the use position of the pressure roller 233, so that the radial direction of the pressure roller 233 is adjusted, and the pressure roller 233 clamps the outer circumference of the flange ring 102, and then place the pipe head 101 on the roller 223, so that the outer chamfer 103 of the pipe head 101 and the inner chamfer 104 of the flange ring 102 maintain a coaxial plug-in state, that is, the pipe head 101 and the flange ring 102 are positioned before welding by using a welding jig; Step 3: Welding execution: Manual arc welding is used for the welding cavity angle formed between the outer chamfer 103 and the inner chamfer 104, and the welding rod is filled along the angle space. The welding is divided into two layers. The first layer covers the chamfer root and the second layer is filled until it is flush with the flange surface. After welding, the weld is annealed to eliminate residual stress. During the welding process, the pressure roller 233 and the roller 223 can rotate the turntable to rotate the pipe head 101 and the flange ring 102 until the welding cavity angle between the pipe head 101 and the flange ring 102 is welded and filled.
[0030] When the present invention is in use, the hand wheel is rotated to drive the first threaded rod 224 and the second threaded rod 237, so that the first lifting plate 221 and the second lifting plate 230 are adjusted in use height respectively, so that the height of the roller 223 of the adjusted pipe head support assembly 22 and the position of the pressure roller 233 of the flange support assembly 23 match the outer diameter of the pipe head 101 to be welded and the outer circumference of the flange ring 102, ensuring the coaxial state of the pipe head 101 and the flange ring 102 during welding, the flange ring 102 is placed between the pressure rollers 233 of the support plate 231, the position of the pressure roller 233 is moved, and the rotating screw sleeve 234 is rotated to fix the use position of the pressure roller 233, so that the radial direction of the pressure roller 233 is adjusted, and the pressure roller 233 clamps the flange ring 102. The outer periphery, and then the pipe head 101 is placed on the roller 223, so that the outer chamfer 103 of the pipe head 101 and the inner chamfer 104 of the flange ring 102 are kept in a coaxial plug-in state, that is, the pipe head 101 and the flange ring 102 are positioned before welding by a welding jig, and the welding cavity angle formed between the outer chamfer 103 and the inner chamfer 104 is welded by manual arc welding, and the welding rod is filled along the angle space, and the welding is divided into two layers. The first layer covers the chamfer root, and the second layer is filled to be flush with the flange surface. After welding, the weld is annealed to eliminate residual stress. During the welding process, the pressure roller 233 and the roller 223 can roll the turntable to rotate the pipe head 101 and the flange ring 102 until the welding cavity angle between the pipe head 101 and the flange ring 102 is welded and filled; A corresponding first annular sealing groove 13 and a second annular sealing ring groove 14 are provided on the facing surfaces of the flange ring 102 of the first pipe flange 11 and the flange ring 102 of the second pipe flange 12, and a rubber sealing ring 15 is manufactured, which is composed of an inner rubber ring and an outer rubber ring, and an air-filled cavity is provided inside. A piston device 16 is installed on the top of the pipe head 101 of the first pipe flange 11, and the bottom of the piston sleeve 161 is welded and fixed to the pipe head of the first pipe flange 11. A screw rod 163 with a piston head 164 is threadedly inserted into the center of the internal threaded plate 162, and a limit block 165 with an inner hexagonal hole 166 is welded at the end of the screw rod 163, and then uniformly inserted into the piston sleeve 161, and the threaded plate 162 is welded and sealed to the inner wall of the piston sleeve 161, and the metal pipe 168 is connected. One end is connected to the piston sleeve 161, and the other end is connected to the hose. The hose is passed through the inner wall of the pipe head 101 and the flange ring 102 of the first pipe flange 11, and is connected to the cavity of the inner rubber ring and the outer rubber ring. Finally, a protective cap is threaded on the end of the piston sleeve away from the metal tube, and the inner rubber ring and the outer rubber ring of the rubber sealing ring 15 are embedded in the first annular sealing groove 13 and the second annular sealing ring groove 14 of the first pipe flange 11, and fixed by gluing. After the first pipe flange 11 and the second pipe flange 12 are butt-mounted, the hexagonal hole 166 of the limit block 165 is inserted and rotated by a hexagonal wrench to push the piston head 164 to the inner and outer rubber rings of the rubber sealing ring 15 from there, so that the sealing between the first pipe flange 11 and the second pipe flange 12 is increased.
[0031] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the present invention, unless otherwise clearly specified and limited, the terms "installed", "set", "connected", "fixed", "screwed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.
Claims
1. A metal pipe flange, characterized in that: It includes a first pipe flange and a second pipe flange. The first pipe flange and the second pipe flange both include a pipe head and a flange ring. The inner periphery of one side of the flange ring is sleeved on the outer periphery of one end of the pipe head. An outer chamfer is provided on the outer periphery of one end of the pipe head close to the flange ring. An inner chamfer is provided on the inner diameter of one side of the flange ring. A welding cavity angle of 20-50° is formed between the outer chamfer and the inner chamfer for the entry of the welding rod. The inner chamfer of the flange ring and the outer chamfer of the pipe head are welded and connected by welding rods.
2. A metal pipe flange according to claim 1, characterized in that: The first pipe flange and the second pipe flange are arranged facing each other, and the flange ring of the first pipe flange and the flange ring of the second pipe flange facing each other are both provided with corresponding first annular sealing grooves, a second annular sealing ring groove is provided on the flange ring and located on the inner periphery of the first annular sealing groove, and a rubber sealing ring corresponding to the first annular sealing groove and the second annular sealing ring groove is provided between the first pipe flange and the second pipe flange; The rubber sealing ring consists of an inner rubber ring and an outer rubber ring. The inner rubber ring is located on the inner periphery of the outer rubber ring, and a cavity for inflation is opened inside the inner rubber ring and the outer rubber ring. The inner rubber ring and the outer rubber ring of the rubber sealing ring are embedded in the first annular sealing groove and the second annular sealing ring groove of the first pipe flange, and are glued and fixed to the first annular sealing groove and the second annular sealing ring groove.
3. A metal pipe flange according to claim 2, characterized in that: A piston device is provided at the top of the pipe head of the first pipe flange, and the piston device includes a piston sleeve. The bottom of the piston sleeve is welded and fixed to the pipe head of the first pipe flange. A metal tube is connected to one end of the piston sleeve, and the end of the metal tube away from the piston sleeve is connected to a hose. The hose is passed through the pipe head and the inner wall of the flange ring of the first pipe flange and is connected to the cavity of the inner rubber ring and the outer rubber ring. The pipe head and the inner wall of the flange ring of the first pipe flange are provided with perforations corresponding to the hose.
4. A metal pipe flange according to claim 3, characterized in that: An internal threaded plate is welded inside the piston sleeve, and a screw is inserted into the central thread of the internal threaded plate. The end of the screw close to the metal tube is connected to the piston head, and the end of the screw away from the piston head is connected to a limiting block. A hexagonal hole is provided on the side of the limiting block away from the screw, and a protective cap is provided on the threaded cover at the end of the piston sleeve away from the metal tube.
5. A welding jig for metal pipe flanges according to any one of claims 1 to 4, characterized in that: It includes a frame, and two ends of the top of the frame are respectively provided with a tube head support assembly for supporting the tube head and a flange support assembly for supporting the flange ring. The bottom of the tube head support assembly and the flange support assembly are respectively provided with a first threaded rod and a second threaded rod for adjusting the height. The first threaded rod and the second threaded rod are respectively connected to the frame threads, and hand wheels are provided at the bottom of the first threaded rod and the second threaded rod.
6. A welding jig for metal pipe flanges according to claim 5, characterized in that: The pipe head support assembly includes a first lifting plate, and roller seats are symmetrically arranged on both sides of the top of the first lifting plate. Rollers for supporting both sides of the bottom of the pipe head are rotatably installed in the roller seats through bearings.
7. A welding jig for metal pipe flanges according to claim 6, characterized in that: The flange support assembly includes a second lifting plate, a support plate is connected to one side of the top of the second lifting plate, and the support plate is provided with adjustment grooves at equal distances along the center of the circle, and at least one group of adjustment grooves is provided. A pressure roller for limiting the outer periphery of the flange ring is provided on one side of the adjustment groove, and one end of the pressure roller is rotatably connected to a screw sleeve with a threaded outer periphery through a bearing, and the screw sleeve passes through the adjustment groove and is provided with an internal threaded sleeve, the diameter of the internal threaded sleeve is greater than the width of the adjustment groove, and handles are provided on both sides of the internal threaded sleeve; The bottoms of the first lifting plate and the second lifting plate are both welded with guide rods, and the guide rods are inserted through the frame.
8. A method for welding a metal pipe flange according to any one of claims 5 to 7, characterized in that: The specific steps are as follows: Step 1: Support assembly adjustment: Rotate the handwheel to drive the first threaded rod and the second threaded rod to adjust the height of the first lifting plate and the second lifting plate respectively, so that the roller height of the adjusted pipe head support assembly and the pressure roller position of the flange support assembly match the outer diameter of the pipe head to be welded and the outer circumference of the flange ring, ensuring the coaxial state of the pipe head and the flange ring during welding; Step 2: Pipeline positioning and fixing: Place the flange ring between the pressure rollers of the support plate, move the position of the pressure roller, and rotate the rotating screw sleeve to fix the use position of the pressure roller, so that the radial direction of the pressure roller is adjusted, and the pressure roller clamps the outer circumference of the flange ring. Then place the pipe head on the roller, so that the outer chamfer of the pipe head and the inner chamfer of the flange ring are kept in a coaxial plug-in state, that is, the pipe head and flange ring are positioned before welding using a welding jig; Step 3: Welding execution: The welding cavity angle formed between the outer chamfer and the inner chamfer is welded by argon arc welding for base and manual arc welding for filling, ensuring that the weld penetration is ≥3mm. During the welding process, the pressure roller and the roller can roll the turntable to rotate the pipe head and the flange ring until the welding cavity angle between the pipe head and the flange ring is welded and filled.