Partition welding method

Abstract

The present invention relates to a partition welding method, which belongs to the field of welding technology, and includes the following steps: preparing tooling; assembling an outer ring plate, an inner ring plate and blades; a red sleeve positioning sleeve; welding; welding a cover plate; welding a radial steam seal body; heat treatment; removing the cover plate and the positioning sleeve; separating the partition along the center dividing surface; performing surfacing welding on the center dividing surface; post-heat treatment and the like. The present invention welds two semicircular partitions together to obtain a partition with better integrity, avoids error accumulation caused by separate welding, and has a higher matching accuracy after being installed in a steam turbine. The present invention uses a positioning sleeve to position the two semicircular outer ring plate bodies, so that the outer ring plate bodies are tightly spliced ​​together as a whole, with better integrity, and the outer ring plate is not easily deformed during the welding process. When welding the radial steam seal ring, the cover plate is used to completely cover the blade to effectively prevent welding slag from splashing onto the blade surface and causing damage to the blade.

Description

Technical Field

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

[0002] Parts of a steam turbine partition such as Figure 1 and Figure 2 As shown, it includes an outer ring plate 1, an inner ring plate 2 and a plurality of blades arranged between the outer ring plate 1 and the inner ring plate 2, and a circular radial steam seal ring 4 is arranged on the inner edge of the end face of the outer ring plate 1. The outer ring plate 1 and the inner ring plate 2 are circular in shape as a whole. In order to facilitate the installation of the partition into the steam turbine, when processing the partition, the partition is usually evenly divided into two parts along the center dividing plane, that is, the outer ring plate 1 and the inner ring plate 2 are semicircular. After processing, the two semicircular partitions are respectively installed in the steam turbine to form a partition with a circular appearance. At present, when processing the partition, the two semicircular partitions are processed separately. In particular, when welding, the blades 3 need to be welded between the outer ring plate 1 and the inner ring plate 2, and the radial steam seal ring 4 needs to be welded to the end face of the outer ring plate 1. Since welding easily causes deformation of parts, it brings certain errors. If the two semicircular partitions are welded separately, the deformation errors are superimposed, which affects the processing accuracy of the partition. In addition, when welding the radial steam seal ring 4 and the outer ring plate 1 , welding slag is likely to splash onto the blades 3 , causing damage to the blades 3 . Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a partition welding method to reduce the error caused by welding.

[0004] To solve the above problems, the technical solution adopted by the present invention is: a partition welding method, comprising:

[0005] S1. Prepare a circular blade gasket, fix the blade gasket to the universal chassis, draw inner ring plate position lines and outer ring plate position lines on the upper surface of the universal chassis, and draw blade position lines on the upper surface of the blade gasket;

[0006] S2. According to the positions of the inner ring plate position line and the outer ring plate position line, two semi-circular outer ring plate bodies and two semi-circular inner ring plate bodies are placed on the universal chassis, the two semi-circular outer ring plate bodies form a circular outer ring plate, and the two semi-circular inner ring plate bodies form a circular inner ring plate, and according to the positions of the blade position lines, each blade is installed between the outer ring plate and the inner ring plate;

[0007] S3. Heat the positioning sleeve to 150-250°C, keep it warm for at least 0.5h, and then immediately put it on the outer ring plate;

[0008] S4. Check the assembly dimensions between the blade and the outer ring plate, and between the blade and the inner ring plate to ensure that the fitting clearance is less than 0.1mm;

[0009] S5. Weld the two ends of the blade to the outer ring plate and the inner ring plate respectively, and perform segmented reinforcement welding. The length of each weld is 70 to 100 mm.

[0010] S6. Use metal-arc gas shielded welding to weld cover plates at both ends of the inner ring plate and the outer ring plate, and the cover plates cover the blades;

[0011] S7. Preheat the outer ring plate and two semicircular radial steam seal bodies to 100 to 150°C and keep them warm for at least 0.5h;

[0012] S8. Use narrow gap gas shielded welding to prime the weld, and then weld two semicircular radial steam seal bodies to the steam inlet end face of the outer ring plate in a symmetrical sequence, so that the two radial steam seal bodies form a circular radial steam seal ring;

[0013] S9, heat treatment;

[0014] S10, removing the cover plate by turning;

[0015] S11, remove the positioning sleeve;

[0016] S12, separating the partition along the center dividing surface, and polishing the center dividing surface to a smooth state;

[0017] S13: Preheat the center plane and the surrounding area within 50mm with local flame preheating, the preheating temperature is higher than 100°C, and the temperature is kept for at least 0.5h;

[0018] S14, performing surfacing welding on the center dividing surface;

[0019] S15, post-heat treatment.

[0020] Furthermore, in step S12, the weld on the center dividing surface is drilled, and the drilling direction is consistent with the radial direction of the partition.

[0021] Furthermore, in step S9, the heat treatment process is: putting the partition into an electric furnace, heating it to 500 to 560° C. and keeping it warm for 4 to 6 hours, then taking it out of the electric furnace and air cooling it to room temperature.

[0022] Furthermore, a support ring plate is provided at the upper end of the positioning sleeve. In step S3, after the positioning sleeve is sleeved on the outer ring plate, the support ring plate is closely attached to the upper end surface of the outer ring plate.

[0023] In step S9, the partition plate together with the positioning sleeve is turned over, and the partition plate together with the positioning sleeve is lifted by a lifting device and placed into the electric furnace; after the insulation is completed, the partition plate together with the positioning sleeve is lifted out of the electric furnace by a lifting device.

[0024] Furthermore, the sling includes a horizontal support seat, a vertical fixed sleeve is arranged at the center of the upper surface of the support seat, and a sliding sleeve is arranged outside the fixed sleeve and slides with the fixed sleeve; three connecting rods are evenly distributed around the fixed sleeve on the support seat, the middle part of the connecting rod is hinged to the support seat, a hook is arranged at one end of the connecting rod, and a transmission rod is hinged at the other end of the connecting rod, the upper end of the transmission rod is hinged to the sliding sleeve, and a lifting ring is arranged on the top of the sliding sleeve.

[0025] Furthermore, a limit block is fixedly arranged inside the upper end of the fixed sleeve, and a rectangular through hole is arranged on the limit block; a circular slide groove is arranged on the inner wall of the sliding sleeve, and a suspension rod is arranged inside the sliding sleeve, and a horizontal support pin is fixedly arranged on the upper end of the suspension rod, and both ends of the support pin are located in the slide groove and slideably cooperate with the slide groove, and a rectangular suspension block is arranged at the lower end of the suspension rod, and the length and width of the suspension block are adapted to the length and width of the rectangular through hole, and the suspension rod is connected to a driving mechanism for driving the suspension rod to rotate.

[0026] Furthermore, two semicircular partitions are placed on a circular support frame, and then the support frame is lifted into the electric furnace by a sling; after the post-heat treatment is completed, the support frame is lifted out of the electric furnace by a sling.

[0027] Furthermore, in step S15, the post-heat treatment process is: placing the partition into an electric furnace and keeping it warm at a temperature of 300 to 350° C. for at least 4 hours.

[0028] Furthermore, before step S2, a high temperature resistant cloth is wrapped around the blade, and both ends of the blade are exposed; after step S5, the high temperature resistant cloth is removed.

[0029] The beneficial effects of the present invention are as follows: 1. The present invention welds two semicircular partitions together to make the partitions more integrated, avoids error accumulation caused by separate welding, and has higher matching accuracy after being installed in the turbine.

[0030] 2. The present invention uses a positioning sleeve to position the two semicircular outer ring plates, so that the outer ring plates are tightly spliced ​​into one, with better integrity. During the welding process, the outer ring plate is not easily deformed. After the positioning sleeve is heated, it is put on the outside of the outer ring plate. According to the principle of thermal expansion and contraction, the inner diameter of the heated positioning sleeve increases, making it easier to be put on the outside of the outer ring plate. After cooling, the inner diameter of the positioning sleeve decreases, and it can cooperate more closely with the outer ring plate, ensuring the tight splicing of the two semicircular outer ring plates.

[0031] 3. When welding the radial steam seal ring, use the cover plate to completely cover the blade to effectively prevent welding slag from splashing onto the blade surface and causing damage to the blade.

[0032] 4. The joint surface between the two outer ring plates and the joint surface between the two inner ring plates are located on the center plane. When welding the cover plate and the radial steam seal ring, the weld will reach the center plane. The two center planes are partially connected. When the partition is separated along the center plane, the center plane is damaged. Therefore, surfacing welding is performed on the center plane to repair the damaged parts and obtain the processing allowance for subsequent machining to ensure the accuracy of the center plane after machining. At the same time, when the steam turbine is installed, the center planes of the two semicircular partitions can fit tightly, thus forming a complete, circular partition. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic top view of a partition of the present invention;

[0034] Figure 2 yes Figure 1 Schematic diagram of the cross section of AA;

[0035] Figure 3 It is a schematic diagram of the blade gasket;

[0036] Figure 4 is a schematic diagram after assembly in step S2;

[0037] Figure 5 This is a schematic diagram after step S3 is red-enclosed;

[0038] Figure 6 yes Figure 5 Schematic diagram of the cross section of the middle BB;

[0039] Figure 7 This is a schematic diagram after welding the cover plate;

[0040] Figure 8 This is a schematic diagram after welding the radial steam seal ring;

[0041] Fig. 9 It is a three-dimensional schematic diagram of the spreader;

[0042] Fig.10 is a schematic cross-sectional view of the upper portion of the fixed sleeve;

[0043] Fig.11 1 is a top view schematic diagram of the limit block;

[0044] Figure numerals: 1—outer ring plate; 2—inner ring plate; 3—blade; 31—; 4—radial steam seal ring; 100—universal chassis; 200—blade gasket; 300—positioning sleeve; 310—support ring plate; 400—support seat; 401—connecting rod; 402—hook; 403—transmission rod; 404—fixing sleeve; 405—sliding sleeve; 406—lifting ring; 407—limiting block; 408—rectangular through hole; 409—lifting rod; 410—support pin; 411—lifting block; 412—driving mechanism; 500—cover plate. DETAILED DESCRIPTION

[0045] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0046] The partition welding method of the present invention comprises the following steps:

[0047] S1, prepare a circular blade gasket 200, the blade gasket 200 is as follows Figure 3 As shown, it is a circular metal plate used to support the blade 3 so that the blade 3 is accurately at the set height. Then the blade gasket 200 is fixed to the universal chassis 100. The universal chassis 100 is a chassis used for existing welding. It is a metal plate. Before use, it is necessary to check whether the upper surface of the universal chassis 100 is horizontal. If the levelness is insufficient, it is necessary to level its upper surface. The blade gasket 200 can be fixed specifically by screws. Draw the inner ring plate position line and the outer ring plate position line on the upper surface of the universal chassis 100, and draw the blade position line on the upper surface of the blade gasket 200. The inner ring plate position line, the outer ring plate position line and the blade position line are contour lines, which are drawn according to the design drawing of the partition.

[0048] S2. According to the positions of the inner ring plate position line and the outer ring plate position line, two semi-circular outer ring plate bodies and two semi-circular inner ring plate bodies are placed on the universal chassis 100. The two semi-circular outer ring plate bodies form a circular outer ring plate 1, and the two semi-circular inner ring plate bodies form a circular inner ring plate 2. According to the positions of the blade position lines, each blade 3 is installed between the outer ring plate 1 and the inner ring plate 2, as shown in FIG. Figure 4 The blade 3 is supported by the blade gasket 200 to ensure that the blade gasket 200 is at a suitable height.

[0049] The inner ring plate position line, the outer ring plate position line and the blade position line can determine the positions of the outer ring plate body, the inner ring plate body and the multiple blades 3. During assembly, the outer ring plate body is placed according to the inner ring plate position line so that the outer contour of the outer ring plate body coincides with the outer ring plate position line. At the same time, the outer contour of the inner ring plate body coincides with the inner ring plate position line, and the outer contour of each blade coincides with the blade position line. The inner ring plate body, the outer ring plate body and the multiple blades can be quickly and accurately assembled in place. At the same time, it is necessary to draw a central dividing surface on the universal chassis 100, and the splicing surfaces of the two outer ring plates are on the central dividing surface, and the splicing surfaces of the two inner ring plates are also on the central dividing surface. Before assembly, the splicing surfaces of the outer ring plate body and the inner ring plate body are milled to a smooth state, and at the same time, ensure that after milling, the outer ring plate body and the inner ring plate body are semicircular rings of standard shape, and the two outer ring plates can just form a circular outer ring plate 1, and the two inner ring plates can just form a circular inner ring plate 2.

[0050] S3, heat the positioning sleeve 300 to 150-250°C, keep it warm for at least 0.5h, and then immediately put it on the outer ring plate 1. Figure 5 and Figure 6 As shown. In order to fix the two outer ring plates so that the two outer ring plates are stably and tightly assembled, the present invention heats the positioning sleeve 300. At room temperature, the inner wall of the positioning sleeve 300 can transitionally match the outer wall of the outer ring plate. After the positioning sleeve 300 is heated, according to the principle of thermal expansion and contraction, the inner diameter of the positioning sleeve 300 increases, and the positioning sleeve 300 is sleeved on the outer bodies of the two outer ring plates while hot. After the positioning sleeve 300 is cooled, the inner diameter of the positioning sleeve 300 decreases, thereby holding the two outer ring plates tightly, ensuring the stability of the two outer ring plates, and preventing the outer ring plates from being greatly deformed during the welding process.

[0051] In addition, a positioning ring may be put on the outer wall of one end of the inner and outer ring plates, and the positioning ring does not contact the blades 3, so as to hold the two inner and outer ring plates tightly.

[0052] Red sleeve means that the sleeve is heated and put on when it is at high temperature.

[0053] S4. Check the assembly dimensions between blade 3 and outer ring plate 1, and blade 3 and inner ring plate 2 to ensure that the fit clearance is less than 0.1mm. If the fit clearance is greater than or equal to 0.1mm, reassemble until the fit clearance is less than 0.1mm. In addition, check the angle of each blade 3 to ensure that the angle error meets the requirements.

[0054] S5. Weld the two ends of the blade 3 to the outer ring plate 1 and the inner ring plate 2 respectively. The welding can be done by electric welding. Perform segmented reinforcement welding, and the length of each weld is 70 to 100 mm. Welding methods such as argon arc welding and mixed gas shielded welding can be used. After welding, the two ends of the blade 3 are fixedly connected to the outer ring plate 1 and the inner ring plate 2, and the welding of the blade 3 is completed.

[0055] During welding, splashing welding slag is generated, and the welding slag is easily splashed onto the blade 3, affecting the surface quality of the blade 3. Therefore, before step S2, a high temperature resistant cloth can be wrapped around the blade 3, and the high temperature resistant cloth can be a glass fiber cloth, and both ends of the blade 3 are exposed; after welding, the high temperature resistant cloth is removed. The high temperature resistant cloth can protect the blade 3 and prevent the welding slag from splashing directly onto the blade 3.

[0056] S6. Use metal arc welding to weld the cover plate 500 at both ends of the inner ring plate 2 and the outer ring plate 1, and the cover plate 500 covers the blades 3. The cover plate 500 is a circular metal plate. Since the material of the inner ring plate 2 and the outer ring plate 1 is Q355B, the cover plate 500 can also be a Q355B plate with a thickness of 10 to 15 mm.

[0057] The cover plate 500 closes the steam inlet and outlet ends of the partition, so that the blades 3 are in a closed space. In the subsequent welding process, welding slag can be prevented from splashing onto the blades 3, thereby preventing the blades 3 from being damaged. In addition, the cover plate 500 connects the inner ring plate 2 and the outer ring plate 1 as a whole, which can effectively reduce the deformation of the outer ring plate 1 in the subsequent welding process and reduce the welding error.

[0058] S7, preheat the outer ring plate 1 and the two semicircular radial steam seal bodies to 100 to 150°C and keep them warm for at least 0.5h. The two semicircular radial steam seal bodies can form a circular radial steam seal ring 4.

[0059] Preheating the outer ring plate 1 and the radial steam seal body before welding can reduce the cooling rate of the weld, prevent welding cracks, and improve the quality of the weld.

[0060] S8. Use narrow gap gas shielded welding to prime the weld, and then weld in a symmetrical sequence to weld two semicircular radial steam seal bodies to the steam inlet end face of the outer ring plate 1. The two radial steam seal bodies form a circular radial steam seal ring 4, and the joint surfaces of the two radial steam seal bodies are located on the center dividing plane.

[0061] Assume that the two ends of one radial steam seal body are the first splicing end and the second splicing end respectively, and the two ends of the other radial steam seal body are the third splicing end and the fourth splicing end respectively, the first splicing end and the fourth splicing end are spliced, and the second splicing end and the third splicing end are spliced, and the symmetrical sequence welding means that the two radial steam seal bodies start welding at the same time, and the welding direction is the same, for example, one radial steam seal body starts welding from the first splicing end and gradually welds to the second splicing end, and the other radial steam seal body starts welding from the third splicing end and gradually welds to the fourth splicing end. Grind and remove slag while welding to ensure that the weld layers are cleaned.

[0062] After the two radial steam seal bodies are welded, the radial steam seal ring 4 is obtained.

[0063] S9, heat treatment, used to eliminate welding stress. Specifically, a high temperature tempering process can be used. The heat treatment process is: put the partition into an electric furnace, heat it to 500 to 560℃, keep it warm for 4 to 6 hours, then take it out of the furnace and air cool it to room temperature.

[0064] S10, removing the cover plate 500 by turning. The cover plate 500 is not a part on the partition plate, so it needs to be removed. Since the cover plate 500 is a circular metal plate, it is only removed by turning.

[0065] S11, removing the positioning sleeve 300. After the radial steam seal ring 4 is welded, the welding process of the partition is basically completed, so the positioning sleeve 300 can be removed. Specifically, the partition can be pressed out of the positioning sleeve 300 by using a pressure device.

[0066] S12. Separate the partition along the center dividing surface to obtain two semicircular partitions, and polish the center dividing surface to a smooth state.

[0067] When welding the radial steam seal ring 4 and the cover plate 500, the weld will reach the center plane, connecting the two outer ring plates, the two inner ring plates and the two radial steam seal bodies. In order to facilitate the separation of the connection between the outer ring plate, the inner ring plate and the radial steam seal body, the present invention drills the weld on the center plane, and the drilling direction is consistent with the radial direction of the partition. Drilling is to use a drill bit to drill into the weld at the center plane. After the material at the weld is drilled off, the partition can be separated along the center plane. Be careful not to damage the blade 3 during drilling.

[0068] S13. For local flame preheating, the preheating temperature of the center plane and the surrounding area within 50 mm is higher than 100°C, specifically 100 to 150°C, and the temperature is kept at least 0.5h.

[0069] S14. Perform surfacing welding on the center dividing surface.

[0070] When the partition is separated along the center plane, drilling the weld will cause the center plane to be damaged and uneven. Because the outer ring plate and the inner ring plate before welding can just be spliced ​​into a circle, and there is no reserve for subsequent machining, the size of the partition is smaller than the design size after the partition is separated and polished along the center plane, and the dimensional accuracy of the partition needs to be improved through machining later, so the size of the partition after being separated along the center plane cannot meet the requirements.

[0071] In order to increase the size of the partition, provide a processing allowance for subsequent center dividing surface machining, and at the same time flatten the damaged part of the center dividing surface, the present invention performs surfacing welding on the center dividing surface. After surfacing welding of a certain thickness of metal material, the size of the center dividing surface is increased. During subsequent machining, the center dividing surface is processed to the designed size to obtain a smooth and flat center dividing surface. After the two semicircular partitions are installed in the turbine, the center dividing surfaces can fit tightly.

[0072] S15, post-heat treatment. Post-heat treatment is to reduce the cooling rate of the cladding layer, prevent cracking inside the cladding layer, and improve the quality of the cladding layer.

[0073] Specifically, the post-heat treatment process is: putting the separator into an electric furnace and keeping it at a temperature of 300 to 350° C. for at least 4 hours.

[0074] In step S9, the partition needs to be placed in an electric furnace for heating. After the treatment, the partition needs to be taken out of the electric furnace. Due to the heavy weight of the partition, the partition must be transferred with the help of a sling.

[0075] In the traditional process, the two semicircular partitions are welded and heat treated separately, but there is no hoist for hoisting semicircular parts, so it is inconvenient to transfer. In the present invention, the partition is integrated into a whole by using the positioning sleeve 300 and the cover plate 500, which is convenient for hoisting the partition.

[0076] Specifically, a support ring plate 310 is provided at the upper end of the positioning sleeve 300 . In step S3 , after the positioning sleeve 300 is sleeved onto the outer ring plate 1 , the support ring plate 310 is closely attached to the upper end surface of the outer ring plate 1 .

[0077] In step S9, the partition plate together with the positioning sleeve 300 is turned over and placed on the cushion block. At this time, the supporting ring plate 310 can support the weight of the partition plate to ensure the stability of the partition plate. Then, the partition plate together with the positioning sleeve 300 is lifted by a lifting device and placed in the electric furnace; after the heat preservation is completed, the partition plate together with the positioning sleeve 300 is lifted out of the electric furnace by a lifting device.

[0078] The lifting device can be any existing lifting device capable of lifting a disc-shaped component, specifically, Fig. 9 , Fig.10 and Fig.11 As shown, the sling of the present invention includes a horizontal support seat 400, and the support seat 400 can be made of a thick metal plate. In order to reduce weight, the support seat 400 can include a horizontal upper plate and a horizontal lower plate, and the upper plate and the lower plate are fixedly connected by a plurality of connecting ribs. A vertical fixing sleeve 404 is provided at the center of the upper surface of the support seat 400, and the fixing sleeve 404 can be welded to the upper surface of the support seat 400. The outer sleeve of the fixing sleeve 404 is provided with a sliding sleeve 405 that is slidably matched with the fixing sleeve 404, and the sliding sleeve 405 can slide up and down. Three connecting rods 401 are evenly distributed around the fixed sleeve 404 on the support seat 400. The middle part of the connecting rod 401 is hinged to the support seat 400. A hook 402 is provided at one end of the connecting rod 401. The hook 402 can be integrally formed with the connecting rod 401. A transmission rod 403 is hinged at the other end of the connecting rod 401. The upper end of the transmission rod 403 is hinged to the sliding sleeve 405. A lifting ring 406 is provided on the top of the sliding sleeve 405.

[0079] The middle part of the connecting rod 401 can be hinged to the support seat 400 through a pin. Specifically, three groups of support arms are welded on the support seat 400. The length direction of the support arms is horizontal. The three groups of support arms are evenly distributed around the fixed sleeve 404. Each group of support arms includes two support arms. There is a spacing between the two support arms, and the support arms are provided with a plurality of evenly distributed connection holes. The connection holes are evenly distributed in the length direction of the support arms. The connecting rod 401 is located between the two support arms, and a pin is provided on the connecting rod 401. The two ends of the pin are respectively located in the connection holes of the two support arms. By matching the pin with different connection holes, the position of the connecting rod 401 can be adjusted, so that it is suitable for lifting parts with various outer diameters.

[0080] When the sliding sleeve 405 moves downward, it pushes the transmission rod 403 to rotate, and the connecting end of the connecting rod 401 and the transmission rod 403 rotates downward, and the end of the connecting rod 401 provided with the hook 402 rotates upward, and the hook 402 gradually moves to the open state. When the sliding sleeve 405 moves upward, it pulls the transmission rod 403 to rotate, and the connecting end of the connecting rod 401 and the transmission rod 403 rotates upward, and the end of the connecting rod 401 provided with the hook 402 rotates downward, and the hook 402 gradually moves to the grasping state.

[0081] When in use, the sling is hung on the lifting equipment as a whole through the lifting ring 406, and the lifting equipment drives the sling to move downward to the top of the positioning sleeve 300, and then pushes the sliding sleeve 405 to move downward, so that the hook 402 opens, and the sling continues to move downward, and the hook 402 gradually moves from the periphery of the positioning sleeve 300 to the bottom of the positioning sleeve 300, and then the lifting equipment drives the lifting ring 406 to move upward, pulling the sliding sleeve 405 to move upward, and when the sliding sleeve 405 moves, it drives the transmission rod 403 to rotate, and the transmission rod 403 drives the connecting rod 401 to rotate, so that the hook 402 rotates to the bottom of the positioning sleeve 300, and the lifting equipment drives the lifting ring 406 to continue to move upward. After the positioning sleeve 300 moves a certain distance, it will drive the sling to move upward as a whole, and then the hook 402 hooks the lower surface of the positioning sleeve 300 and drives the positioning sleeve 300 and the internal partition to move upward as a whole, so that the partition can be lifted into the electric furnace as a whole. After the partition enters the electric furnace, the sliding sleeve 405 is moved downward, so that the hook 402 releases the positioning sleeve 300, and then the lifting device is taken out.

[0082] After the sling is hooked to the lifting equipment, in the natural state without lifting parts, the sliding sleeve 405 is in a high position and the hook 402 is in a grabbing state. When the partition needs to be lifted, the sliding sleeve 405 needs to be pushed downward along the fixed sleeve 404 to make the hook 402 move to the open state. If the sliding sleeve 405 is pushed manually to move, the operation is inconvenient, and when the partition is taken out of the electric furnace, the temperature in the electric furnace is very high and it is difficult to operate manually.

[0083] After the sling is hooked to the lifting device, in order to make the hook 402 in an open state in a natural state, so as to facilitate the grabbing of the partition, the present invention is fixedly provided with a limit block 407 inside the upper end of the fixed sleeve 404, and the limit block 407 can be welded inside the fixed sleeve 404, and a rectangular through hole 408 is provided on the limit block 407. The inner wall of the sliding sleeve 405 is provided with a circular slide groove, and a suspension rod 409 is provided inside the sliding sleeve 405. A horizontal support pin 410 is fixedly provided at the upper end of the suspension rod 409, and both ends of the support pin 410 are located in the slide groove and slide with the slide groove to ensure that the suspension rod 409 can rotate, and the suspension rod 409 can move up and down at the same time with the sliding sleeve 405. When the suspension rod 409 moves downward with the sliding sleeve 405, the lower end of the suspension rod 409 can move to the bottom of the limit block 407; when the suspension rod 409 moves upward with the sliding sleeve 405, the lower end of the suspension rod 409 can move to the top of the limit block 407. A cuboid suspension block 411 is provided at the lower end of the suspension rod 409, and the length and width of the suspension block 411 are adapted to the length and width of the rectangular through hole 408. When the length direction of the suspension block 411 is parallel to the length direction of the rectangular through hole 408, the suspension block 411 can pass through the rectangular through hole 408, and when the length direction of the suspension block 411 is perpendicular to the length direction of the rectangular through hole 408, the suspension block 411 cannot pass through the rectangular through hole 408. The suspension rod 409 is connected to a driving mechanism 412 for driving the suspension rod 409 to rotate. The driving mechanism 412 can be an existing device such as a stepping motor, and is fixedly installed inside the sliding sleeve 405.

[0084] In the initial state, the hanging block 411 is below the limit block 407, and the length direction of the hanging block 411 is perpendicular to the length direction of the rectangular through hole 408, so the hanging block 411 cannot pass through the rectangular through hole 408. At the same time, the sliding sleeve 405 is in a low position and the hook 402 is in an open state. When the sling is hung on the lifting equipment, the hanging block 411 hooks the lower surface of the limit block 407, and the sliding sleeve 405 cannot slide upward along the fixed sleeve 404, so the hook 402 can remain in an open state. When the partition needs to be lifted, the sling is lowered so that each hook 402 moves downward along the outside of the positioning sleeve 300 to a position lower than the lower end of the positioning sleeve 300, and then the driving mechanism 412 is used to drive the hanging rod 409 to rotate 90°, and the hanging rod 409 drives the hanging block 411 to rotate 90°. After the rotation, the length direction of the hanging block 411 is parallel to the length direction of the rectangular through hole 408, and the hanging block 411 can pass through the rectangular through hole 408. Then the lifting equipment drives the lifting ring 406 to move upward, pulls the sliding sleeve 405 upward, drives the lifting rod 409 and the lifting block 411 to move upward, and the lifting block 411 passes upward through the rectangular through hole 408, and at the same time makes the hook 402 move to the grasping state and is located below the positioning sleeve 300. The lifting equipment drives the lifting ring 406 to continue to move upward, and the positioning sleeve 300 can be lifted together with the partition. After the partition is hoisted to the destination and lowered, the sleeve 405 slides downward under the action of its own gravity, driving the suspension rod 409 and the suspension block 411 to move downward, and the suspension block 411 passes downward through the rectangular through hole 408 and moves to below the limit block 407. At the same time, the hook 402 moves to the open state, and the positioning sleeve 300 is released. Then the driving mechanism 412 is used to drive the suspension rod 409 and the suspension block 411 to rotate 90°. The suspension block 411 returns to the initial position and cannot pass through the rectangular through hole 408. The lifting equipment can then be used to move the sling upward as a whole, and the hook 402 remains in the open state to complete the separation of the sling and the partition.

[0085] In step S15, in order to facilitate the delivery of the two semicircular partitions into the electric furnace, the two semicircular partitions are placed on a circular support frame, and then the support frame is lifted into the electric furnace using a sling; after the post-heat treatment is completed, the support frame is lifted out of the electric furnace using a sling. Figure 7 and Figure 8 The sling shown will do.

[0086] 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 partition welding method, characterized in that: include S1, preparing a circular blade gasket (200), fixing the blade gasket (200) to a universal chassis (100), marking an inner ring plate position line and an outer ring plate position line on the upper surface of the universal chassis (100), and marking a blade position line on the upper surface of the blade gasket (200); S2. According to the positions of the inner ring plate position line and the outer ring plate position line, two semi-circular outer ring plate bodies and two semi-circular inner ring plate bodies are placed on the universal chassis (100), the two semi-circular outer ring plate bodies form a circular outer ring plate (1), the two semi-circular inner ring plate bodies form a circular inner ring plate (2), and according to the positions of the blade position lines, each blade (3) is installed between the outer ring plate (1) and the inner ring plate (2); S3, heating the positioning sleeve (300) to 150-250°C, keeping the temperature for at least 0.5h, and then immediately sleeve it over the outer ring plate (1); S4. Check the assembly dimensions between the blade (3) and the outer ring plate (1), and between the blade (3) and the inner ring plate (2), and ensure that the fitting clearance is less than 0.1 mm; S5, welding the two ends of the blade (3) to the outer ring plate (1) and the inner ring plate (2) respectively, and performing segmented reinforcement welding, with the length of each weld being 70 to 100 mm; S6. Using metal-arc gas shielded welding to weld cover plates (500) at both ends of the inner ring plate (2) and the outer ring plate (1), wherein the cover plates (500) cover the blades (3); S7, preheating the outer ring plate (1) and the two semicircular radial steam seal bodies to 100 to 150°C and keeping them warm for at least 0.5h; S8, using narrow gap gas shielded welding to prime the weld, and then welding in a symmetrical sequence to weld two semicircular radial steam seal bodies to the steam inlet end face of the outer ring plate (1), the two radial steam seal bodies forming a circular radial steam seal ring (4); S9, heat treatment; S10, removing the cover plate by turning (500); S11, removing the positioning sleeve (300); S12, separating the partition along the center dividing surface, and polishing the center dividing surface to a smooth state; S13: Preheat the center plane and the surrounding area within 50mm with local flame preheating, the preheating temperature is higher than 100°C, and the temperature is kept for at least 0.5h; S14, performing surfacing welding on the center dividing surface; S15, post-heat treatment.

2. The partition welding method according to claim 1, characterized in that: In step S12, the weld on the center dividing surface is drilled, and the drilling direction is consistent with the radial direction of the partition.

3. The partition welding method according to claim 1, characterized in that: In step S9, the heat treatment process is as follows: put the partition into an electric furnace, heat it to 500 to 560° C., keep it warm for 4 to 6 hours, then take it out of the electric furnace and air cool it to room temperature.

4. The partition welding method according to claim 3, characterized in that: The upper end of the positioning sleeve (300) is provided with a supporting ring plate (310). In step S3, after the positioning sleeve (300) is sleeved onto the outer ring plate (1), the supporting ring plate (310) is closely attached to the upper end surface of the outer ring plate (1); In step S9, the partition plate together with the positioning sleeve (300) is turned over, and the partition plate together with the positioning sleeve (300) is lifted up by a lifting device and placed into the electric furnace; After the insulation is completed, the partition plate together with the positioning sleeve (300) is lifted out of the electric furnace using a lifting device.

5. The partition welding method according to claim 4, characterized in that: The sling comprises a horizontal support seat (400), a vertical fixing sleeve (404) is arranged at the center of the upper surface of the support seat (400), and the outer shell of the fixing sleeve (404) is provided with a sliding sleeve (405) that slidably cooperates with the fixing sleeve (404); three connecting rods (401) are evenly distributed around the fixing sleeve (404) on the support seat (400), the middle part of the connecting rod (401) is hinged to the support seat (400), one end of the connecting rod (401) is provided with a hook (402), and the other end of the connecting rod (401) is hinged with a transmission rod (403), the upper end of the transmission rod (403) is hinged to the sliding sleeve (405), and the top of the sliding sleeve (405) is provided with a lifting ring (406).

6. The partition welding method according to claim 5, characterized in that: A limit block (407) is fixedly arranged inside the upper end of the fixed sleeve (404), and a rectangular through hole (408) is arranged on the limit block (407); a circular slide groove is arranged on the inner wall of the sliding sleeve (405), and a suspension rod (409) is arranged inside the sliding sleeve (405); a horizontal support pin (410) is fixedly arranged on the upper end of the suspension rod (409), and both ends of the support pin (410) are located in the slide groove and slideably cooperate with the slide groove; a rectangular suspension block (411) is arranged at the lower end of the suspension rod (409), and the length and width of the suspension block (411) are adapted to the length and width of the rectangular through hole (408); and the suspension rod (409) is connected to a driving mechanism (412) for driving the suspension rod (409) to rotate.

7. The partition welding method according to claim 5, characterized in that: In step S15, two semicircular partitions are placed on a circular support frame, and then the support frame is lifted into the electric furnace by a sling; after the post-heat treatment is completed, the support frame is lifted out of the electric furnace by a sling.

8. The partition welding method according to claim 1, characterized in that: In step S15, the post-heat treatment process is: putting the partition into an electric furnace and keeping it at a temperature of 300 to 350° C. for at least 4 hours.

9. The partition welding method according to claim 1, characterized in that: Before step S2, a high temperature resistant cloth is wrapped around the blade (3), with both ends of the blade (3) exposed; after step S5, the high temperature resistant cloth is removed.

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