Steam seal body welding method

Abstract

According to the steam seal body welding method, a first ring plate, a second ring plate, a third ring plate, a first ring sleeve, a second ring sleeve and a third ring sleeve are complete ring-shaped parts, the integrity is higher during welding, the deformation amount is smaller, the machining amount can be reduced, and a first assembly, a second assembly and a third assembly obtained through welding are small in thickness and relatively simple in structure; and the post-welding cutting processing is more convenient. When the first assembly, the second assembly and the third assembly are welded to the outer sleeve, the positioning shaft is used for supporting the inner hole, the positioning sleeve is used for clamping the outer sleeve, the cushion block is used for positioning the axial position, it is guaranteed that all the components are tightly spliced, the welding deformation amount is reduced, the semi-circular-ring-shaped parts are spliced into a complete circular ring shape, and the welding quality is improved. The two semicircular parts are welded at the same time, the overall consistency is high, the size error caused by welding deformation is further reduced, and the follow-up assembly precision is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of welding, in particular to a steam seal body welding method. Background Art

[0002] The steam seal is installed between the turbine shaft and the casing to prevent the leakage of high-pressure steam inside the turbine. Generally speaking, both ends of the shaft need to be sealed by the steam seal. Figure 1 As shown, it includes flange 1, outer sleeve 2, first ring plate 3, second ring plate 4, third ring plate 5, first ring sleeve 6, second ring sleeve 7, third ring sleeve 8, connecting ring plate 9, inner sleeve 10 and enclosure 11. Flange 1 is arranged on the outer wall of outer sleeve 2, first ring plate 3, second ring plate 4 and third ring plate 5 are arranged on the inner wall of outer sleeve 2, first ring sleeve 6, second ring sleeve 7 and third ring sleeve 8 are respectively fixedly connected with the inner side of first ring plate 3, second ring plate 4 and third ring plate 5, connecting ring plate 9 fixes first ring sleeve 6 and inner sleeve 10, enclosure 11 is a 1 / 2 truncated cone-shaped enclosure, the small end of which is fixedly connected to the third ring sleeve 8, and the large end is connected with the fourth ring sleeve 12. During manufacturing, the connections between various components are all welded. In order to facilitate assembly, the entire steam seal body is evenly divided into two parts along the center dividing plane, and enclosure 11 is arranged on a part of the third ring sleeve 8. At present, the two parts are machined and welded separately. The deformation generated during welding is accumulated, and the overall accuracy after assembly is low. A large machining allowance needs to be reserved during welding, which is not conducive to improving processing efficiency. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a steam seal body welding method to improve the overall accuracy after welding.

[0004] In order to solve the above problems, the technical solution adopted by the present invention is: a steam seal body welding method, comprising the following steps:

[0005] S1, preparing a first ring plate, a second ring plate, a third ring plate, a first ring sleeve, a second ring sleeve and a third ring sleeve in a circular shape;

[0006] Prepare a semicircular flange, an outer sleeve, a connecting ring plate, an inner sleeve, a fourth ring sleeve and a cover;

[0007] S2, welding the first ring plate to the outer wall of the first ring sleeve to obtain a first assembly; welding the second ring plate to the outer wall of the second ring sleeve to obtain a second assembly; welding the third ring plate to the outer wall of the third ring sleeve to obtain a third assembly;

[0008] S3, cutting the first component, the second component and the third component along the mid-plane;

[0009] S4, first weld the first component into the outer sleeve, and then weld the second component and the third component into the outer sleeve. During welding, use tooling for positioning, and the center planes of the first component, the second component, the third component and the outer sleeve overlap;

[0010] S5, welding the connecting ring plate into the first ring sleeve, welding the inner sleeve to the connecting ring plate, and making the center dividing surfaces of the connecting ring plate, the outer sleeve and the inner sleeve overlap;

[0011] S6. Weld the flange to the outer wall of the outer sleeve, so that the center planes of the flange and the outer sleeve coincide with each other;

[0012] S7, welding the fourth ring sleeve to the large end of the enclosure, and welding the small end of the enclosure to the third ring sleeve;

[0013] S8. Tempering.

[0014] Further, step S4 includes:

[0015] S41. Prepare tooling: the tooling comprises a horizontal base and a frame arranged above the base, the base is provided with a vertical positioning shaft, the positioning shaft is a hollow shaft, a first heating mechanism is arranged inside the positioning shaft, a detachable positioning boss is arranged on the outer wall of the positioning shaft, a positioning sleeve is arranged on the second frame, the positioning sleeve is coaxial with the positioning shaft, a second heating mechanism is arranged on the outer wall of the positioning sleeve, and the positioning sleeve is connected to a first driving mechanism for driving the positioning sleeve to move axially;

[0016] S42, setting a first cushion block on the base, placing the second component on the base, the second ring plate of the second component fits the first cushion block, the second ring sleeve is sleeved on the positioning shaft and fits with the positioning boss, and then the outer sleeve is placed on the base, and the outer sleeve is sleeved outside the second ring plate; using the first heating mechanism to heat the positioning shaft to an outer wall temperature of 100°C to 150°C, using the second heating mechanism to heat the positioning sleeve to 100°C to 150°C, and then using the first driving mechanism to push the positioning sleeve to move downward and sleeve it outside the outer sleeve, the second heating mechanism stops heating, and the first heating mechanism continues heating, and the second ring plate is welded to the outer sleeve;

[0017] S43, a second gasket is arranged on the upper surface of the second ring plate, a third gasket is arranged on the upper surface of the second ring sleeve, the first assembly is pressed between the positioning shaft and the outer sleeve, the first ring plate of the first assembly is fitted with the second gasket, the first ring sleeve is fitted with the third gasket, and then the first ring plate is welded to the outer sleeve to obtain a fourth assembly;

[0018] S44. Remove the fourth component, dismantle the first pad, the second pad and the third pad, turn the fourth component over and place it on the base, then set the fourth pad on the upper surface of the second ring plate, set the fifth pad on the upper surface of the second ring sleeve, press the third component between the positioning shaft and the outer sleeve, fit the third ring plate of the third component with the fourth pad, fit the third ring sleeve with the fifth pad, and then weld the third ring plate to the outer sleeve.

[0019] Furthermore, in step S3, the first component, the second component and the third component are cut along the center plane using wire cutting.

[0020] Furthermore, after step S3, the sizes of the first component, the second component and the third component after cutting are detected, and when the sizes of the middle faces of the first component, the second component and the third component are smaller than the set sizes, surfacing is performed on the middle faces of the first component, the second component and the third component.

[0021] Furthermore, the weld between the first ring plate and the first ring sleeve is a double-sided butt weld, and the weld between the first ring plate and the outer sleeve is an outer side butt weld; the weld between the second ring plate and the first ring sleeve is a double-sided butt weld, and the weld between the second ring plate and the outer sleeve is a double-sided butt weld; the weld between the third ring plate and the third ring sleeve is a double-sided butt weld, and the weld between the third ring plate and the outer sleeve is an outer side butt weld; the weld between the connecting ring plate and the first ring sleeve is a double-sided butt weld, and the weld between the connecting ring plate and the inner sleeve is a double-sided butt weld; the weld between the flange and the outer sleeve is a double-sided butt weld; the weld between the fourth ring sleeve and the enclosure is an inner side butt weld, and the weld between the enclosure and the third ring sleeve is an inner side butt weld.

[0022] Furthermore, in steps S4 to S7, after welding, there is an anti-sticking section between the weld and the center dividing surface. After step S7, the steam seal body is divided into two parts along the center dividing surface, and then the anti-sticking section is repaired by welding.

[0023] Furthermore, in step S7, half of the steam seal body is placed on a horizontal support seat, on which a slide seat and a vertical center dividing surface limit plate are provided, the slide seat is slidably matched with the support seat, and the slide seat is connected to a second driving mechanism for driving the slide seat to move toward the center dividing surface limit plate, the slide seat is provided with an inverted L-shaped pressure plate, and the upper surface of the pressure plate is provided with a support cover; the center dividing surface of the steam seal body fits in with the center dividing surface limit plate, and the pressure plate fits in with the outer wall and top wall of the steam seal body; then the surrounding cover and the fourth ring sleeve are placed on the support cover, the surrounding cover and the fourth ring sleeve are both fitted with the support cover, and the center dividing surfaces of the surrounding cover and the fourth ring sleeve fit in with the center dividing surface limit plate, and then welding is performed.

[0024] Furthermore, in step S7, after welding, the weld is kept at a temperature of 200 to 250° C. for 3 to 4 hours, and the weld is polished.

[0025] Furthermore, the support seat is installed on a pair of horizontal rails, and the support seat is connected to a third driving mechanism for driving the support seat to move along the rails. After welding, the third driving mechanism drives the support seat to move to the grinding and heat preservation station;

[0026] The polishing and heat preservation station is provided with a lifting frame, on which a vertical rotating shaft is provided, the rotating shaft is connected to a fourth driving mechanism for driving the rotating shaft to rotate, at least three positioning rods perpendicular to the rotating shaft are fixedly provided on the rotating shaft, the positioning rod is provided with a cantilever that slides with the positioning rod, locking nuts that threadably cooperate with the positioning rod are provided on both sides of the cantilever, and a detachable polishing ring is provided at the end of the cantilever, the polishing ring is provided with a polishing surface, and a third heating mechanism is provided inside the polishing ring.

[0027] The beneficial effects of the present invention are as follows: the first ring plate, the second ring plate, the third ring plate, the first ring sleeve, the second ring sleeve and the third ring sleeve of the present invention are complete circular ring parts, which have higher integrity and smaller deformation during welding, which is beneficial to reducing the amount of machining, and the first component, the second component and the third component obtained by welding have a smaller thickness and a relatively simple structure, and are more convenient to cut and process after welding.

[0028] When the first component, the second component and the third component are welded to the outer sleeve, the inner hole is supported by a positioning shaft, the outer sleeve is tightened by a positioning sleeve, and the axial position is positioned by a gasket, thereby ensuring that the components are tightly assembled and reducing the welding deformation. The semicircular parts are all spliced ​​into complete circular rings, and the two parts of the semicircular parts are welded at the same time, with high overall consistency, further reducing the dimensional error caused by welding deformation and improving the subsequent assembly accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a cross-sectional schematic diagram of the steam seal body of the present invention when the cross section is perpendicular to the center dividing plane;

[0030] Figure 2 This is a schematic diagram of the second component when it is welded;

[0031] Figure 3 This is a schematic diagram of the first component when it is welded;

[0032] Figure 4 This is a schematic diagram of the third component when it is welded;

[0033] Figure 5 It is a schematic diagram of each weld;

[0034] Figure 6 is a schematic diagram of step S7;

[0035] Figure 7 is a schematic diagram of weld grinding in step S7;

[0036] Figure 8 yes Figure 7 A magnified schematic diagram of part A;

[0037] Reference numerals: 1—flange; 2—outer sleeve; 3—first ring plate; 4—second ring plate; 5—third ring plate; 6—first ring sleeve; 7—second ring sleeve; 8—third ring sleeve; 9—connecting ring plate; 10—inner sleeve; 11—enclosure; 12—fourth ring sleeve; 20—positioning shaft; 21—first heating mechanism; 22—positioning boss; 23—base; 24—base; 25—positioning sleeve; 26—second heating mechanism; 27—first driving mechanism; 28—first cushion block; 210 —second pad; 211—third pad; 214—fourth pad; 215—fifth pad; 30—support seat; 31—slide seat; 32—center dividing surface limit plate; 33—second driving mechanism; 34—pressing plate; 35—support cover; 36—track; 37—third driving mechanism; 38—lifting frame; 39—rotating shaft; 310—fourth driving mechanism; 311—positioning rod; 312—cantilever; 313—locking nut; 314—grinding ring; 315—third heating mechanism. DETAILED DESCRIPTION

[0038] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0039] The steam seal body welding method of the present invention comprises the following steps:

[0040] S1, preparing a first ring plate 3, a second ring plate 4, a third ring plate 5, a first ring sleeve 6, a second ring sleeve 7 and a third ring sleeve 8 in annular shapes.

[0041] A semicircular flange 1, an outer sleeve 2, a connecting ring plate 9, an inner sleeve 10, a fourth ring sleeve 12 and a cover 11 are prepared.

[0042] The first ring plate 3, the second ring plate 4, the third ring plate 5, the first ring sleeve 6, the second ring sleeve 7 and the third ring sleeve 8 can be cut by cutting the plate, and the inner and outer circles are machined after cutting to remove burrs and process the welding groove at the same time.

[0043] The flange 1, the outer sleeve 2, the connecting ring plate 9 and the fourth ring sleeve 12 can be cut from a plate, and then rough-machined and processed for welding grooves. The inner sleeve 10 and the enclosure 11 are first cut from a plate, then curled to a desired shape, and then roughly machined and processed for welding grooves.

[0044] S2, welding the first ring plate 3 to the outer wall of the first ring sleeve 6 to obtain a first assembly; welding the second ring plate 4 to the outer wall of the second ring sleeve 7 to obtain a second assembly; welding the third ring plate 5 to the outer wall of the third ring sleeve 8 to obtain a third assembly.

[0045] The first ring plate 3, the second ring plate 4, the third ring plate 5, the first ring sleeve 6, the second ring sleeve 7 and the third ring sleeve 8 are complete circular rings, and when welded, the integrity is higher and the deformation of the parts is smaller. The first component, the second component and the third component obtained after welding are smaller in thickness and can be conveniently cut into two parts.

[0046] S3, cutting the first component, the second component and the third component along the center dividing plane.

[0047] After welding, the first component, the second component and the third component can be tempered respectively to remove welding stress, and then cut along the center plane, which is a plane passing through the center of the first component, the second component and the third component and extending radially, to divide the first component, the second component and the third component into two parts, each part is a semicircular ring.

[0048] The cutting can be flame cutting, water cutting, etc. In order to improve the accuracy of the cut surface, it is preferred to use wire cutting to cut the first component, the second component and the third component along the center plane. Wire cutting has high accuracy and the obtained cut surface is flat.

[0049] After cutting, a cutting seam is bound to be produced. During subsequent welding, the center planes of the first component, the second component, and the third component are difficult to fit tightly. Therefore, it is necessary to detect the size of the first component, the second component, and the third component after cutting. When the size of the center plane of the first component, the second component, and the third component is smaller than the set size, surfacing is performed on the center plane of the first component, the second component, and the third component, and the surface of the surfacing material is polished flat. The material used for surfacing is the same as that of the first component, the second component, and the third component. By surfacing a certain thickness of metal material, the material removed during cutting can be supplemented to ensure that the size of the first component, the second component, and the third component meets the requirements. During subsequent welding, the center planes of the first component, the second component, and the third component can fit tightly.

[0050] S4. First weld the first component into the outer sleeve 2, and then weld the second component and the third component into the outer sleeve 2. During welding, use tooling for positioning, and the center planes of the first component, the second component, the third component and the outer sleeve 2 overlap.

[0051] from Figure 1 It can be seen that the gaps between the first ring sleeve 6, the second ring sleeve 7 and the third ring sleeve 8 are small, and it is difficult to extend into the gaps between the first ring plate 3, the second ring plate 4 and the third ring plate 5 before welding. Therefore, the second ring plate 4 located in the middle is welded first, and then the first ring plate 3 and the third ring plate 5 located at both ends are welded to ensure that the welding gun has sufficient operating space.

[0052] In order to reduce welding deformation and improve dimensional accuracy, the specific welding process includes:

[0053] S41. Prepare tooling: The tooling includes a horizontal base 23 and a frame 24 arranged above the base 23, a vertical positioning shaft 20 is arranged on the base 23, the positioning shaft 20 is a hollow shaft, and a first heating mechanism 21 is arranged inside the positioning shaft 20, a removable positioning boss 22 is arranged on the outer wall of the positioning shaft 20, a positioning sleeve 25 is arranged on the second frame 24, the positioning sleeve 25 is coaxial with the positioning shaft 20, a second heating mechanism 26 is arranged on the outer wall of the positioning sleeve 25, and the positioning sleeve 25 is connected to a first driving mechanism 27 for driving the positioning sleeve 25 to move axially.

[0054] The base 23 can be fixed to the ground. After the base 23 is installed, the horizontality of the upper surface of the base 23 is detected to ensure that the upper surface of the base 23 is in a horizontal state. The outer diameter of the positioning shaft 20 is adapted to the inner diameters of the first ring sleeve 6, the second ring sleeve 7 and the third ring sleeve 8, ensuring that the inner walls of the first ring sleeve 6, the second ring sleeve 7 and the third ring sleeve 8 can fit closely to the outer wall of the positioning shaft 20. The first heating mechanism 21 is used to heat the positioning shaft 20. According to the principle of thermal expansion and contraction, the outer diameter of the heated positioning shaft 20 increases, and the first ring sleeve 6, the second ring sleeve 7 and the third ring sleeve 8 can be more closely supported. The positioning boss 22 is annular, can be sleeved on the positioning shaft 20 and slide with the positioning shaft 20, and the positioning boss 22 can be easily disassembled and assembled. The inner diameter of the positioning sleeve 25 is adapted to the outer diameter of the outer sleeve 2, ensuring that the inner wall of the positioning sleeve 25 can fit closely to the outer wall of the outer sleeve 2. The second heating mechanism 26 is used to heat the positioning sleeve 25. The positioning sleeve 25 expands after being heated, and the inner diameter increases so that it can be mounted outside the outer sleeve 2. After mounting, the second heating mechanism 26 stops heating, and the positioning sleeve 25 gradually cools and shrinks, and the inner diameter decreases, thereby holding the outer sleeve 2 tightly, thereby stably positioning the outer sleeve 2, ensuring that the two semicircular outer sleeves 2 form a complete annular outer sleeve 2, and at the same time reducing the deformation during welding. The first heating mechanism 21 and the second heating mechanism 26 can use electric heating wires. In order to reduce heat loss, a heat insulation layer covering the second heating mechanism 26 can be set on the outer wall of the positioning sleeve 25. The first driving mechanism 27 can use equipment such as a hydraulic cylinder.

[0055] S42, a first cushion block 28 is arranged on the base 23, and the first cushion block 28 is used to support the second ring plate 4. The second component is placed on the base 23, and the second ring plate 4 of the second component is fitted with the first cushion block 28. The second ring sleeve 7 is sleeved on the positioning shaft 20 and fits with the positioning boss 22. Then the outer sleeve 2 is placed on the base 23, and the outer sleeve 2 is sleeved outside the second ring plate 4. The second component and the outer sleeve 2 are both semicircular rings, and there are two of them. After assembly, the center dividing surfaces fit together to form a circular second component and an outer sleeve 2, and the center dividing surface of the second component is in the same plane as the center dividing surface of the outer sleeve 2. The positioning boss 22 and the first cushion block 28 make the second ring sleeve 7 and the second ring plate 4 in a set axial position.

[0056] The positioning sleeve 25 is heated to 100°C to 150°C by the second heating mechanism 26, and then the positioning sleeve 25 is pushed downward by the first driving mechanism 27 and is sleeved outside the outer sleeve 2. The positioning sleeve 25 expands after heating, and the inner diameter increases, so that it can be sleeved outside the outer sleeve 2 relatively easily. Then, the positioning shaft 20 is heated to an outer wall temperature of 100°C to 150°C by the first heating mechanism 21. The positioning shaft 20 expands after heating, and the outer diameter increases, thereby tightening the second ring sleeve 7. When the first heating mechanism 21 is running, the second heating mechanism 26 can stop heating, and the positioning sleeve 25 gradually cools down and holds the outer sleeve 2 tightly. In order to improve the stability of the second ring sleeve 7 and the second ring plate 4, a clamping mechanism can also be set on the upper surface of the second ring plate 4 or the second ring sleeve 7 to press the second ring plate 4 or the second ring sleeve 7 downward.

[0057] After the second assembly and the outer sleeve 2 are stably assembled, the second ring plate 4 can be welded to the outer sleeve 2. During welding, the first heating mechanism 21 continues to heat.

[0058] The present invention uses the positioning shaft 20 to tighten the inner hole of the second ring sleeve 7, and uses the positioning sleeve 25 to hold the outer sleeve 2, so as to ensure that the semicircular ring parts are stably assembled and tightly matched, and at the same time limit the deformation of the parts during welding. In addition, the semicircular ring parts are assembled into complete ring parts and then welded, and there is no need to weld them separately, so as to avoid the accumulation of errors caused by welding deformation and improve the dimensional accuracy after welding.

[0059] S43. Set a second pad 210 on the upper surface of the second ring plate 4, set a third pad 211 on the upper surface of the second ring sleeve 7, press the first component between the positioning shaft 20 and the outer sleeve 2, the first ring plate 3 of the first component fits with the second pad 210, the first ring sleeve 6 fits with the third pad 211, and then weld the first ring plate 3 to the outer sleeve 2 to obtain the fourth component.

[0060] The second pad 210 and the third pad 211 are used to determine the axial position of the first component to ensure that the spacing between the first component and the second component meets the requirements. A clamping mechanism can also be set on the upper surface of the first ring plate 3 or the first ring sleeve 6 to press the first ring plate 3 or the first ring sleeve 6 downward to improve the stability of the first ring plate 3 and the first ring sleeve 6 and prevent deformation.

[0061] In order to facilitate the removal of the second spacer block 210 , the second spacer block 210 may be a plurality of sector-shaped ring-shaped metal blocks.

[0062] S44, after the first component is welded, the fourth component is removed. Specifically, the second heating mechanism 26 is used to heat the positioning sleeve 25 to 100° C. to 150° C., and then the first driving mechanism 27 is used to drive the positioning sleeve 25 to move upward to the top of the fourth component. Then, the fourth component is removed from the positioning shaft 20.

[0063] Remove the first pad 28, the second pad 210, the third pad 211 and the positioning boss 22. Turn the fourth component over and place it on the base 23, making sure that the inner wall of the fourth component fits the outer wall of the positioning shaft 20, and then use the first drive mechanism 27 to drive the positioning sleeve 25 to move downward so that the positioning sleeve 25 is again sleeved on the outer sleeve 2. Then set the fourth pad 214 on the upper surface of the second ring plate 4, and the fifth pad 215 on the upper surface of the second ring sleeve 7, press the third component between the positioning shaft 20 and the outer sleeve 2, the third ring plate 5 of the third component fits the fourth pad 214, the third ring sleeve 8 fits the fifth pad 215, and then weld the third ring plate 5 to the outer sleeve 2. After welding, use the first drive mechanism 27 to drive the positioning sleeve 25 to move upward, and remove the steam seal body.

[0064] S5. Weld the connecting ring plate 9 into the first ring sleeve 6, and weld the inner sleeve 10 onto the connecting ring plate 9, so that the center dividing surfaces of the connecting ring plate 9, the outer sleeve 2 and the inner sleeve 10 coincide with each other.

[0065] When welding, the various components of the steam seal body can be assembled on a horizontal platform first, and then welded.

[0066] S6. Weld the flange 1 to the outer wall of the outer sleeve 2, so that the center planes of the flange 1 and the outer sleeve 2 coincide with each other.

[0067] S7, welding the fourth ring sleeve 12 to the large end of the enclosure 11, and welding the small end of the enclosure 11 to the third ring sleeve 8.

[0068] Specifically, half of the steam seal body is placed on a horizontal support seat 30, on which a slide seat 31 and a vertical center-dividing surface stop plate 32 are provided, the slide seat 31 is slidably matched with the support seat 30, and the slide seat 31 is connected to a second driving mechanism 33 for driving the slide seat 31 to move toward the center-dividing surface stop plate 32, and the second driving mechanism 33 can be a hydraulic cylinder or other equipment. An inverted L-shaped pressing plate 34 is provided on the slide seat 31, and a supporting cover 35 is provided on the upper surface of the pressing plate 34; the center-dividing surface of the steam seal body fits the center-dividing surface stop plate 32, and the pressing plate 34 fits the outer wall and the top wall of the steam seal body; then the enclosure 11 and the fourth ring sleeve 12 are placed on the support cover 35, the enclosure 11 and the fourth ring sleeve 12 are both fitted with the support cover 35, and the center-dividing surfaces of the enclosure 11 and the fourth ring sleeve 12 fit the center-dividing surface stop plate 32, and then welding is performed.

[0069] The semicircular steam seal body is placed between the pressure plate 34 and the center dividing surface limit plate 32, and the center dividing surface of the steam seal body is in contact with the center dividing surface limit plate 32, and then the second driving mechanism 33 is used to push the pressure plate 34 to move toward the center dividing surface limit plate 32, so that the pressure plate 34 presses the steam seal body. The pressure plate 34 includes an arc-shaped vertical plate and a horizontal top plate. The vertical plate can press the outer wall of the steam seal body, and the top plate can fit with the top wall of the steam seal body, so that the steam seal body can remain stable. The shape and size of the support cover 35 are adapted to the shape and size of the enclosure 11 and the fourth ring sleeve 12, including a truncated cone-shaped first support body, a horizontal support body and a circular hoop. The support cover 35 can stably support the enclosure 11 and the fourth ring sleeve 12. In order to improve the stability of the enclosure 11 and the fourth ring sleeve 12, a clamping mechanism can be used to clamp the enclosure 11 and the fourth ring sleeve 12.

[0070] Since the enclosure 11 is an arc-shaped enclosure, it is more easily deformed during welding and the welding stress is relatively large. Therefore, after welding, the weld is kept at a temperature of 200 to 250° C. for 3 to 4 hours and the weld is polished. By keeping the weld warm, the welding stress can be reduced and defects such as cracks inside the weld can be prevented.

[0071] The support seat 30 is installed on a pair of horizontal rails 36, and the support seat 30 is connected to a third driving mechanism 37 that drives the support seat 30 to move along the rails 36. After welding, the third driving mechanism 37 drives the support seat 30 to move to the grinding and insulation station.

[0072] Since the enclosure 11 is connected to the third ring sleeve 8 only through the weld, the weight of the enclosure 11 and the fourth ring sleeve 12 needs to be supported by the weld, and since there is a horizontal distance between the center of the enclosure 11 and the weld, the gravity of the enclosure 11 will generate torque on the weld. If the pressing plate 34 and the support cover 35 are removed immediately after welding, the weld is not yet stable, and the gravity of the enclosure 11 and the fourth ring sleeve 12 will easily cause the weld between the enclosure 11 and the third ring sleeve 8 to generate a large stress, resulting in defects such as cracks inside the weld. In order to solve this problem, during welding, the third driving mechanism 37 drives the support seat 30 to move to the welding station, and after welding, the third driving mechanism 37 drives the support seat 30 and the steam seal body to move to the grinding and heat preservation station. During the grinding and heat preservation process, the pressing plate 34 and the support cover 35 maintain the support and positioning of the steam seal body, and the gravity of the enclosure 11 and the fourth ring sleeve 12 is borne by the support cover 35, and will not be transmitted to the weld between the enclosure 11 and the third ring sleeve 8, which is conducive to ensuring the quality of the weld. The third driving mechanism 37 can be a conventional driving mechanism such as a screw-nut mechanism driven by a motor.

[0073] At present, the welding seam is usually ground after insulation is completed, which takes a long time and affects production efficiency. In order to improve efficiency, the present invention directly transports the support seat 30 together with the steam seal body to the grinding and insulation station after welding, which is convenient for the transfer of the steam seal body and does not require secondary positioning of the steam seal body.

[0074] The grinding and heat preservation station is provided with a lifting frame 38, the lifting frame 38 is connected to a lifting mechanism such as a hydraulic cylinder, a vertical rotating shaft 39 is provided on the lifting frame 38, the rotating shaft 39 is connected to a fourth driving mechanism 310 for driving the rotating shaft 39 to rotate, the fourth driving mechanism 310 can be a servo motor, at least three positioning rods 311 perpendicular to the rotating shaft 39 are fixedly provided on the rotating shaft 39, the positioning rod 311 is provided with a cantilever 312 that is slidably matched with the positioning rod 311, and locking nuts 313 that are threadedly matched with the positioning rod 311 are provided on both sides of the cantilever 312, and a detachable grinding ring 314 is provided at the end of the cantilever 312, the grinding ring 314 is provided with a grinding surface, and a wear-resistant layer is provided on the grinding surface, and the wear-resistant layer can be made of existing wear-resistant materials. A third heating mechanism 315 is provided in the grinding ring 314, and the third heating mechanism 315 can be an electric heating wire.

[0075] During grinding, the lifting frame 38 moves downward, driving the grinding ring 314 to move downward, so that the grinding surface of the grinding ring 314 contacts the weld, and then the fourth driving mechanism 310 drives the rotating shaft 39 to rotate at high speed, and the rotating shaft 39 drives the grinding ring 314 to rotate at high speed through the positioning rod 311 and the cantilever 312, so that the weld can be ground. During grinding, the third heating mechanism 315 heats the grinding ring 314 to 200 to 250°C, so that the weld is always at a temperature of 200 to 250°C. After grinding is completed, the third heating mechanism 315 continues to heat and keep the weld warm. When the insulation time of the weld reaches the process requirements, the lifting frame 38 moves upward, and the grinding ring 314 is separated from the weld. After the weld cools to room temperature, the third driving mechanism 37 is used to drive the pressing plate 34 and the support cover 35 to move in a direction away from the steam seal body, and the support for the enclosure 11 and the fourth ring sleeve 12 is released.

[0076] In the present invention, the welding seam is ground while being heat-insulated, which saves the time of grinding and improves the efficiency compared with the traditional heat-insulation and grinding separately. In addition, the welding seam temperature during grinding is 200 to 250°C, which is higher and the material is softer, so it is easier to grind it smooth.

[0077] In the grinding and heat-insulating equipment of the present invention, the cantilever 312 is vertically arranged, and the grinding ring 314 can be connected to the cantilever 312 by screws. The grinding ring 314 with a grinding surface of corresponding shape and size can be replaced according to the shape and size of the weld, and the grinding ring 314 with different inner and outer diameters can also be replaced according to the inner and outer diameters of the annular weld. When replacing, rotate the locking nut 313, slide the cantilever 312, adjust the distance from the cantilever 312 to the rotating shaft 39, and then use the locking nut 313 to lock the cantilever 312.

[0078] S8. Tempering: remove welding stress and use conventional tempering process.

[0079] In the present invention, Figure 5 As shown, the weld between the first ring plate 3 and the first ring sleeve 6 is a double-sided butt weld, and the weld between the first ring plate 3 and the outer sleeve 2 is an outer side butt weld; the weld between the second ring plate 4 and the first ring sleeve 6 is a double-sided butt weld, and the weld between the second ring plate 4 and the outer sleeve 2 is a double-sided butt weld; the weld between the third ring plate 5 and the third ring sleeve 8 is a double-sided butt weld, and the weld between the third ring plate 5 and the outer sleeve 2 is an outer side butt weld; the weld between the connecting ring plate 9 and the first ring sleeve 6 is a double-sided butt weld, and the weld between the connecting ring plate 9 and the inner sleeve 10 is a double-sided butt weld; the weld between the flange 1 and the outer sleeve 2 is a double-sided butt weld; the weld between the fourth ring sleeve 12 and the enclosure 11 is an inner side butt weld, and the weld between the enclosure 11 and the third ring sleeve 8 is an inner side butt weld.

[0080] Double-sided butt welding means processing grooves on both sides of the part, and butt welding is performed on both sides of the part during welding. In step S42, welding can be performed on one side of the second ring plate 4 to obtain a butt weld on one side, and in step S44, the fourth component is turned over and welded on the other side of the second ring plate 4 to obtain a butt weld on the other side, and then the fourth cushion block 214 and the fifth cushion block 215 are arranged.

[0081] When the first ring plate 3 and the third ring plate 5 are welded to the outer sleeve 2, the welding can only be performed on the outside of the first ring plate 3 and the third ring plate 5, so only the outer side butt weld can be used, and the outer side butt weld runs through the first ring plate 3 and the third ring plate 5, and the width of the outer side butt weld decreases from the outside to the inside. Similarly, when the fourth ring sleeve 12 is welded to the enclosure 11, and the enclosure 11 is welded to the third ring sleeve 8, the welding gun can only be used on the inside of the enclosure 11, so it is an inner side butt weld.

[0082] In steps S4 to S7, each component is spliced ​​into a complete circular ring by semicircular ring-shaped components. During welding, if the weld extends to the center dividing surface, the molten metal material will flow to the center dividing surface and connect the parts on both sides of the center dividing surface into one. After welding, the material of the center dividing surface must be cut off to separate the parts along the center dividing surface, resulting in the destruction of the center dividing surface. Therefore, in steps S4 to S7, after welding, there is an anti-sticking section between the weld and the center dividing surface, that is, the weld does not extend to the center dividing surface, and a distance is reserved without welding. The length of the anti-sticking section is 30 to 50 mm, which can avoid the molten metal material at the weld flowing to the center dividing surface during welding, causing the parts on both sides of the center dividing surface to be connected into one. After step S7, the steam seal body is divided into two parts along the center dividing surface, and then the anti-sticking section is repaired.

[0083] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A steam seal welding method, characterized in that: The following steps are involved: S1, preparing a first ring plate (3), a second ring plate (4), a third ring plate (5), a first ring sleeve (6), a second ring sleeve (7) and a third ring sleeve (8) in a circular shape; Prepare a semicircular flange (1), an outer sleeve (2), a connecting ring plate (9), an inner sleeve (10), a fourth ring sleeve (12) and a cover (11); S2, welding the first ring plate (3) to the outer wall of the first ring sleeve (6) to obtain a first assembly; welding the second ring plate (4) to the outer wall of the second ring sleeve (7) to obtain a second assembly; welding the third ring plate (5) to the outer wall of the third ring sleeve (8) to obtain a third assembly; S3, cutting the first component, the second component and the third component along the mid-plane; S4, first welding the first component into the outer sleeve (2), and then welding the second component and the third component into the outer sleeve (2). During welding, positioning is performed using a tool, and the center planes of the first component, the second component, the third component and the outer sleeve (2) are overlapped; S5, welding the connecting ring plate (9) into the first ring sleeve (6), welding the inner sleeve (10) onto the connecting ring plate (9), and making the center dividing surfaces of the connecting ring plate (9), the outer sleeve (2) and the inner sleeve (10) coincide with each other; S6. Weld the flange (1) to the outer wall of the outer sleeve (2), so that the center planes of the flange (1) and the outer sleeve (2) coincide with each other; S7, welding the fourth ring sleeve (12) to the large end of the enclosure (11), and welding the small end of the enclosure (11) to the third ring sleeve (8); S8. Tempering.

2. The steam seal body welding method according to claim 1, characterized in that: Step S4 includes: S41. Prepare a tool: the tool comprises a horizontal base (23) and a frame (24) arranged above the base (23); a vertical positioning shaft (20) is arranged on the base (23); the positioning shaft (20) is a hollow shaft; a first heating mechanism (21) is arranged inside the positioning shaft (20); a detachable positioning boss (22) is arranged on the outer wall of the positioning shaft (20); a positioning sleeve (25) is arranged on the second frame (24); the positioning sleeve (25) is coaxial with the positioning shaft (20); a second heating mechanism (26) is arranged on the outer wall of the positioning sleeve (25); and the positioning sleeve (25) is connected to a first driving mechanism (27) for driving the positioning sleeve (25) to move axially; S42, a first cushion block (28) is arranged on the base (23), the second component is placed on the base (23), the second ring plate (4) of the second component is fitted with the first cushion block (28), the second ring sleeve (7) is sleeved on the positioning shaft (20) and is fitted with the positioning boss (22), and then the outer sleeve (2) is placed on the base (23), and the outer sleeve (2) is sleeved outside the second ring plate (4); the positioning shaft (20) is heated to an outer wall temperature of 100° C. to 150° C. by using the first heating mechanism (21), the positioning sleeve (25) is heated to 100° C. to 150° C. by using the second heating mechanism (26), and then the positioning sleeve (25) is pushed downward by using the first driving mechanism (27) and sleeved outside the outer sleeve (2), the second heating mechanism (26) stops heating, and the first heating mechanism (21) continues heating, and the second ring plate (4) is welded to the outer sleeve (2); S43, a second cushion block (210) is arranged on the upper surface of the second ring plate (4), a third cushion block (211) is arranged on the upper surface of the second ring sleeve (7), the first component is pressed between the positioning shaft (20) and the outer sleeve (2), the first ring plate (3) of the first component is fitted with the second cushion block (210), the first ring sleeve (6) is fitted with the third cushion block (211), and then the first ring plate (3) is welded to the outer sleeve (2) to obtain a fourth component; S44, remove the fourth component, dismantle the first cushion block (28), the second cushion block (210) and the third cushion block (211), turn the fourth component over and place it on the base (23), then set the fourth cushion block (214) on the upper surface of the second ring plate (4), set the fifth cushion block (215) on the upper surface of the second ring sleeve (7), press the third component between the positioning shaft (20) and the outer sleeve (2), fit the third ring plate (5) of the third component with the fourth cushion block (214), fit the third ring sleeve (8) with the fifth cushion block (215), and then weld the third ring plate (5) to the outer sleeve (2).

3. The steam seal body welding method according to claim 1, characterized in that: In step S3, the first component, the second component and the third component are cut along the center plane by wire cutting.

4. The steam seal body welding method according to claim 1, characterized in that: After step S3, the sizes of the first component, the second component and the third component after cutting are detected. When the sizes of the middle faces of the first component, the second component and the third component are smaller than the set sizes, surfacing welding is performed on the middle faces of the first component, the second component and the third component.

5. The steam seal body welding method according to claim 1, characterized in that: The weld between the first ring plate (3) and the first ring sleeve (6) is a double-sided butt weld, and the weld between the first ring plate (3) and the outer sleeve (2) is an outer side butt weld; the weld between the second ring plate (4) and the first ring sleeve (6) is a double-sided butt weld, and the weld between the second ring plate (4) and the outer sleeve (2) is a double-sided butt weld; the weld between the third ring plate (5) and the third ring sleeve (8) is a double-sided butt weld, and the weld between the third ring plate (5) and the outer sleeve (2 ) are outer side butt welds; the weld between the connecting ring plate (9) and the first ring sleeve (6) are double-sided butt welds, and the weld between the connecting ring plate (9) and the inner sleeve (10) are double-sided butt welds; the weld between the flange (1) and the outer sleeve (2) are double-sided butt welds; the weld between the fourth ring sleeve (12) and the enclosure (11) is an inner side butt weld, and the weld between the enclosure (11) and the third ring sleeve (8) is an inner side butt weld.

6. The steam seal body welding method according to claim 1, characterized in that: In steps S4 to S7, after welding, there is an anti-sticking section between the weld and the center dividing surface. After step S7, the steam seal body is divided into two parts along the center dividing surface, and then the anti-sticking section is repaired by welding.

7. The steam seal body welding method according to claim 1, characterized in that: In step S7, half of the steam seal body is placed on a horizontal support seat (30), and a slide seat (31) and a vertical center-dividing surface limiting plate (32) are arranged on the support seat (30), the slide seat (31) and the support seat (30) are slidably matched, and the slide seat (31) is connected to a second driving mechanism (33) for driving the slide seat (31) to move toward the center-dividing surface limiting plate (32), and an inverted L-shaped pressing plate (34) is arranged on the slide seat (31), and the pressing plate ( A support cover (35) is arranged on the upper surface of the steam seal body; the center dividing surface of the steam seal body fits the center dividing surface limiting plate (32), and the pressure plate (34) fits the outer wall and the top wall of the steam seal body; then the surrounding cover (11) and the fourth ring sleeve (12) are placed on the support cover (35), the surrounding cover (11) and the fourth ring sleeve (12) are both fitted with the support cover (35), and the center dividing surfaces of the surrounding cover (11) and the fourth ring sleeve (12) fit the center dividing surface limiting plate (32), and then welding is performed.

8. The steam seal welding method according to claim 7, characterized in that: In step S7, after welding, the weld is kept at a temperature of 200 to 250°C for 3 to 4 hours, and the weld is polished.

9. The steam seal welding method according to claim 8, characterized in that: The support seat (30) is installed on a pair of horizontal rails (36), and the support seat (30) is connected to a third driving mechanism (37) for driving the support seat (30) to move along the rails (36). After welding, the third driving mechanism (37) drives the support seat (30) to move to the grinding and heat preservation station; The grinding and heat preservation station is provided with a lifting frame (38), a vertical rotating shaft (39) is provided on the lifting frame (38), the rotating shaft (39) is connected to a fourth driving mechanism (310) for driving the rotating shaft (39) to rotate, at least three positioning rods (311) perpendicular to the rotating shaft (39) are fixedly provided on the rotating shaft (39), a cantilever (312) slidably matched with the positioning rod (311) is provided on the positioning rod (311), locking nuts (313) threadedly matched with the positioning rod (311) are provided on both sides of the cantilever (312), and a detachable grinding ring (314) is provided at the end of the cantilever (312), the grinding ring (314) is provided with a grinding surface, and a third heating mechanism (315) is provided inside the grinding ring (314).

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