Steam turbine generator base and welding method
Through segmented welding and inspection methods, the problem of welding deformation of the steam turbine generator base is solved, product quality and production efficiency are improved, and the concentricity and overall performance of the generator base are ensured.
Patent Information
- Application Number
- CN202411259674.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-10
- Publication Date
- 2024-12-13
AI Technical Summary
The steam turbine generator base is prone to deformation during welding, resulting in the center line offset, affecting the performance and safe operation of the generator.
The staged welding method is adopted to weld the excitation end base, the intermediate base and the steam end base respectively, and size inspection and weld flaw detection are carried out to ensure the accuracy of each section before overall assembly is carried out through the design of the top plate and the outer cover plate. Reduce the risk of deformation.
Welding deformation is effectively controlled, product quality and production efficiency are improved, and the concentricity and overall performance of the generator base are ensured.
Smart Images
Figure CN119134738A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of generator bases, and in particular relates to a steam turbine generator base and a welding method. Background Art
[0002] The turbine generator frame is the basic structure that supports and fixes the entire generator set. The turbine generator frame is welded from steel plates. In order to reduce the vibration of the generator, improve the efficiency of the generator and extend its service life, strict requirements are placed on the concentricity, verticality and welding quality of the turbine generator frame. However, since the generator frame is usually huge and heavy, it is easy to deform during the welding process, causing the center line of the frame to shift, which directly affects the assembly of the engine stator and affects the performance and safe operation of the generator.
[0003] Therefore, the above problems need to be solved urgently. Summary of the invention
[0004] Purpose of the invention: In order to overcome the above shortcomings, the present invention provides a steam turbine generator base and a welding method, which adopts segmented welding to reduce the production difficulty, improve production efficiency, control the size and quality of each section, avoid dimensional deviation caused by overall welding, improve product quality, and improve the overall performance of the generator base.
[0005] Technical solution: In order to achieve the above-mentioned purpose, the present invention provides a steam turbine generator base, including a base. The base includes an excitation end base, an intermediate base, a steam end base, a top plate, and an outer cover plate. The top plate is a long plate type, and top side plates are respectively provided on both sides of the long sides of the top plate. The excitation end base, the intermediate base, and the steam end base are placed between the two top side plates. The excitation end base, the intermediate base, and the steam end base are welded to the top plate in sequence. The excitation end base, the intermediate base, the steam end base, and the top plate together constitute the base frame, and the outer cover plate is welded to the outside of the base frame. An excitation end base is welded to the lower side of the excitation end base, and a steam end base is welded to the lower side of the steam end base. A base foot is provided on the lower side of the intermediate base, and external air duct plates are welded on both sides of the base foot, and the external air duct plates form an air duct. The present invention divides the middle section of the machine base into multiple sections and welds them separately. After each welding is completed, it is necessary to perform size inspection and weld flaw detection. After passing the inspection, they are assembled on the top plate in sequence, which improves production efficiency, can control the size and quality of each section, is conducive to controlling welding deformation, avoiding excessive deformation caused by overall welding, and improving product quality.
[0006] Furthermore, the turbine generator frame, the excitation end frame includes an excitation end plate and an excitation end spacer ring, and a plurality of excitation end spacer rings are provided. An excitation end support rib is provided between the excitation end plate and the excitation end spacer ring, and the two ends of the excitation end support rib are respectively connected to the excitation end plate and the excitation end spacer ring. The excitation end spacer ring includes an excitation end wide ring and an excitation end narrow ring.
[0007] Furthermore, in the above-mentioned steam turbine generator base, the steam end base includes a steam end end plate and a steam end spacer ring, a plurality of steam end spacer rings are provided, steam end support ribs are provided between the steam end end plate and the steam end spacer ring, the two ends of the steam end support ribs are respectively connected to the steam end end plate and the steam end spacer ring, and the steam end spacer ring includes a steam end wide ring and a steam end narrow ring.
[0008] Furthermore, in the steam turbine generator frame, the intermediate frame includes a first intermediate frame, a second intermediate frame, and a third intermediate frame. The first intermediate frame, the second intermediate frame, and the third intermediate frame are welded to the top plate along the top side plate. The number of spacer rings of the intermediate frame is large, and the intermediate frame is further divided into three sections, which is conducive to controlling the dimensional accuracy of the intermediate frame and reducing welding deformation.
[0009] Furthermore, the above-mentioned steam turbine generator base, the middle base includes a plurality of middle spacer rings welded together, an middle support rod is provided between two middle spacer rings, the middle support rod passes through all the middle spacer rings, the middle support rod connects all the middle spacer rings, the middle spacer rings include a middle wide ring and a middle narrow ring, and the middle wide ring and the middle narrow ring are arranged at intervals.
[0010] Furthermore, in the steam turbine generator base, a windshield is provided between the middle spacer rings, and the windshield is arranged between the middle spacer rings. The windshield is arranged on the upper side of the base.
[0011] Furthermore, the steam turbine generator base is provided with hanging brackets, which are arranged in pairs on both sides of the base.
[0012] A welding method for the above-mentioned steam turbine generator frame comprises the following steps: S1: Prepare materials.
[0013] S1-1: All parts are cut by CNC gas cutting machine, and all parts are cut with bevel and polished by semi-automatic gas cutting machine. All parts are flattened by hydraulic press.
[0014] S1-2: The outer cover plate is bent into an arc shape using a rolling machine, and the outer air duct plate is formed using a mold.
[0015] S2: Welding: Weld the parts into end plates and spacer rings, and weld support ribs between the end plates and spacer rings to form the excitation end machine base, the first intermediate machine base, the second intermediate machine base, the third intermediate machine base, and the steam end machine base.
[0016] S3: Inspection. The inspector checks the dimensions of the parts and the welds according to the relevant standards. The welds are inspected for flaws.
[0017] S4: Assembly.
[0018] S4-1: Draw the frame line and cross center line on the welding platform, position the two top side panels in width, hang the top panel between the two top side panels, draw the width center line on the top panel, and use the width center line of the top panel as the assembly reference line. Leave expansion space between the top panel and the top side panels.
[0019] S4-2: Lift the first, second and third intermediate machine bases to the upper side of the top plate, adjust the concentricity of the first, second and third intermediate machine bases to make them concentric, adjust the verticality of the middle spacer ring to meet the requirements of the drawing, and then weld and fix them.
[0020] S4-3: Install and weld the support pipes and ribs between the excitation end machine base, the first intermediate machine base, the second intermediate machine base, the third intermediate machine base, and the steam end machine base, and bury the pipelines at the same time.
[0021] S4-4: Assemble the excitation end machine base and the steam end machine base. Lift the excitation end machine base and the steam end machine base to the two ends of the first intermediate machine base, the second intermediate machine base, and the third intermediate machine base that have been lap-welded and fixed, adjust the excitation end machine base and the steam end machine base to be concentric with the first intermediate machine base, the second intermediate machine base, and the third intermediate machine base, and lap-weld and fix the excitation end machine base and the steam end machine base.
[0022] S5: The inspector remeasures the assembly dimensions and records them, and remeasures the inner circle dimensions of the spacer ring.
[0023] S6: Install and weld the lifting seat, and fully weld the lifting seat and the internal spacer ring of the machine base. Weld the process support between the partitions before assembling the lifting seat.
[0024] S8: Assemble the top outer cover plate and the bottom outer cover plate, and fix the top outer cover plate and the bottom outer cover plate by spot welding.
[0025] S9: Assemble the base, excitation end base, steam end base and external air duct plate, fix the base, excitation end base, steam end base and external air duct plate by spot welding, and then fully weld the weld.
[0026] S10: Weld the longitudinal welds between the outer cover panels.
[0027] S11: Install and weld the process dummy ring. The process dummy ring is concentrically arranged with the excitation end plate and the steam end plate, and the process dummy ring is welded and fixed with the excitation end plate and the steam end plate.
[0028] S12: The machine base is lifted onto the tire rolling seat by means of a lifting and climbing seat, and the process false ring is in contact with the tire rolling seat.
[0029] S13: The machine base is rotated and welded on the tire roller seat through a process fake ring, and the weld seam that is not fully welded before the full welding sequence.
[0030] S14: Clean and sandblast the machine base.
[0031] S14-1: Remove weld pox, check dimensions and welds, and perform flaw detection on welds.
[0032] S14-2: Block ports, screw holes, and through holes to protect machined surfaces.
[0033] S14-3: Sandblasting.
[0034] S14-4: Vibrate the machine base to relieve stress.
[0035] S14-5: Cut off the false process rings and process support parts, and thoroughly clean the machine base.
[0036] Furthermore, the above-mentioned steam turbine generator frame welding method: step S13 comprises: S13-1: The machine base is rotated and welded on the roller base, and the welds except the internal fillet welds between the excitation end plate and the outer cover plate, and the fillet welds at the flat welding position between the spacer ring and the outer cover plate are welded.
[0037] S13-2: The crane places the machine base in an upright position through the climbing seat, and the steam end machine base is placed on the upper side. The lifting workbench is lifted into the machine base.
[0038] S13-3: Weld the internal fillet welds of the excitation end plate and the outer cover plate. Weld the fillet welds at the flat welding position between the excitation end spacer ring, steam end spacer ring, middle spacer ring and outer cover plate, and weld the above fillet welds to 1 / 2 weld leg.
[0039] S13-4: The crane rotates the machine base 180° through the climbing seat and places the excitation end machine base on the upper side.
[0040] S13-5: Weld the internal fillet welds between the excitation end plate and the outer cover plate. Weld the fillet welds at the flat welding position between the excitation end spacer ring, steam end spacer ring, middle spacer ring and outer cover plate, and weld the above fillet welds to the drawing size.
[0041] S13-6: The crane lays the machine base horizontally and welds the remaining parts.
[0042] Furthermore, the above-mentioned steam turbine generator base welding method: S1-1 includes: when the CNC gas cutting machine is cutting, the parts are kept connected, the parts and the remaining steel plates are kept connected, and the parts are cut off after cooling.
[0043] It can be seen from the above technical scheme that the present invention has the following beneficial effects: the turbine generator base and welding method of the present invention divides the generator base into multiple sections, each section is welded separately, and installed on the top plate after passing the inspection. After the section welding, the overall assembly is performed, and the size of each section of the base can be controlled separately, which reduces the deformation of the base after assembly, reduces the production difficulty, and improves the production efficiency. During the welding process, the top plate is placed on the platform, the top side plates are welded on both sides of the top plate, and then the sections of the base are assembled from the middle to the two sides. The sections of the base are lap-welded and fixed. The top side plates can reduce the welding difficulty and improve the concentricity of each section of the base. The generator base will fully weld the welds except the fillet welds on the rolling tire seat, which can reduce the welding difficulty and improve the welding quality. Converting the generator base from a horizontal state to a vertical state for welding can improve the welding quality, change the stress condition of the engine base, reduce the deformation of the engine base axis during welding, improve the concentricity of the generator base, and improve the overall performance of the generator base. BRIEF DESCRIPTION OF THE DRAWINGS
[0044] Figure 1 It is a structural schematic diagram of the steam turbine generator base of the present invention; Figure 2 is a cross-sectional view of a steam turbine generator frame of the present invention; Figure 3 The present invention is a structural schematic diagram of a steam turbine generator base being placed on a rolling base and welded.
[0045] In the figure: 1, machine base, 11, excitation end machine base, 111, excitation end end plate, 112, excitation end spacer ring, 1121, excitation end wide ring, 1122, excitation end narrow ring, 113, excitation end support rib, 114, excitation end base, 12, intermediate machine base, 121, first intermediate machine base, 122, second intermediate machine base, 123, third intermediate machine base, 124, intermediate spacer ring, 1241, intermediate wide ring, 1242, intermediate narrow ring , 1243, wind shield, 125, middle support rod, 13, steam end base, 131, steam end end plate, 132, steam end spacer ring, 1321, steam end wide ring, 1322, steam end narrow ring, 133, steam end support rib, 134, steam end base, 14, top plate, 141, top side plate, 15, outer cover plate, 16, outer air duct plate, 17, base, 18, climbing seat, 19, process false ring, 20, tire roller seat. DETAILED DESCRIPTION
[0046] Example 1 like Figure 1-2A steam turbine generator base shown includes a base 1. The base 1 includes an excitation end base 11, an intermediate base 12, a steam end base 13, a top plate 14, and an outer cover plate 15. The top plate 14 is a long plate, and top side plates 141 are respectively provided on both sides of the long sides of the top plate 14. The excitation end base 11, the intermediate base 12, and the steam end base 13 are placed between the two top side plates 141. The excitation end base 11, the intermediate base 12, and the steam end base 13 are welded to the top plate 14 in sequence. The excitation end base 11, the intermediate base 12, the steam end base 13, and the top plate 14 together constitute the frame of the base 1, and the outer cover plate 15 is welded to the outside of the frame of the base 1. An excitation end base 114 is welded to the lower side of the excitation end base 11, and a steam end base 134 is welded to the lower side of the steam end base 13. A foot 17 is provided at the lower side of the middle machine base 12, and external air duct plates 16 are welded on both sides of the foot 17, and the external air duct plates 16 form an air duct. The excitation end machine base 11 includes an excitation end end plate 111 and an excitation end spacer ring 112, and a plurality of excitation end spacer rings 112 are provided. An excitation end support rib 113 is provided between the excitation end plate 111 and the excitation end spacer ring 112, and the two ends of the excitation end support rib 113 are respectively connected to the excitation end plate 111 and the excitation end spacer ring 112. The excitation end spacer ring 112 includes an excitation end wide ring 1121 and an excitation end narrow ring 1122. The steam end machine base 13 includes a steam end plate 131 and a steam end spacer ring 132. There are multiple steam end spacer rings 132. A steam end support rib 133 is provided between the steam end plate 131 and the steam end spacer ring 132. The two ends of the steam end support rib 133 are respectively connected to the steam end plate 131 and the steam end spacer ring 132. The steam end spacer ring 132 includes a steam end wide ring 1321 and a steam end narrow ring 1322. The intermediate machine base 12 includes a first intermediate machine base 121, a second intermediate machine base 122, and a third intermediate machine base 123. The first intermediate machine base 121, the second intermediate machine base 122, and the third intermediate machine base 123 are welded to the top plate 14 along the top side plate 141. The intermediate machine base 12 is formed by welding a plurality of intermediate spacer rings 124, an intermediate support rod 125 is arranged between two intermediate spacer rings 124, the intermediate support rod 125 passes through all the intermediate spacer rings 124, the intermediate support rod 125 connects all the intermediate spacer rings 124, the intermediate spacer rings 124 include an intermediate wide ring 1241 and an intermediate narrow ring 1242, the intermediate wide ring 1241 and the intermediate narrow ring 1242 are arranged at intervals. Wind shields 1243 are arranged between the intermediate spacer rings 124, and the wind shields 1243 are arranged at intervals between the intermediate spacer rings 124. The wind shields 1243 are arranged on the upper side of the machine base 1. The machine base 1 is provided with a hanging seat 18, and the hanging seat 18 is arranged in pairs on both sides of the machine base 1.
[0047] A welding method for the above-mentioned steam turbine generator frame comprises the following steps: S1: Prepare materials.
[0048] S1-1: All parts are cut by CNC gas cutting machine, and all parts are cut with bevel and polished by semi-automatic gas cutting machine. All parts are flattened by hydraulic press, and the flatness of all parts is ≤2mm.
[0049] S1-2: The outer cover plate 15 is bent into an arc shape using a plate rolling machine, and the outer air duct plate is formed using a mold.
[0050] S2: Welding: Weld the parts into end plates and spacer rings, and weld support ribs between the end plates and spacer rings to form the excitation end machine base 11, the first intermediate machine base 121, the second intermediate machine base 122, the third intermediate machine base 123, and the steam end machine base 13. After welding, the welds of all end plates and spacer rings are ground and flattened, with a flatness of ≤2mm.
[0051] S3: Inspection. The inspector inspects the dimensions of the parts and the welds according to the relevant standards. The welds are inspected for flaws. Ultrasonic testing is used for flaw detection.
[0052] S4: Assembly.
[0053] S4-1: Draw the frame line and cross center line on the welding platform, position the two top side panels 141 in width, hang the top panel 14 between the two top side panels 141, draw the width center line on the top panel 14, and use the width center line of the top panel 14 as the assembly reference line. The top panel 14 and the top side panels 141 have a certain amount of expansion and contraction.
[0054] S4-2: Lift the first intermediate machine base 121, the second intermediate machine base 122, and the third intermediate machine base 123 to the upper side of the top plate 14, adjust the concentricity of the first intermediate machine base 121, the second intermediate machine base 122, and the third intermediate machine base 123, make them concentric, and recheck with a laser alignment instrument to ensure that the concentricity between the spacer ring and the end plate is ≤3mm. Adjust the verticality of the middle spacer ring 124 to meet the requirements of the drawing and then fix it by lap welding. Use temporary positioning support tools to adjust the verticality of each layer of spacer rings to ≤1.5mm.
[0055] S4-3: Install and weld the excitation end machine base 11 and the steam end machine base 13. Install and weld the support pipes and ribs between the excitation end machine base 11, the first intermediate machine base 121, the second intermediate machine base 122, the third intermediate machine base 123, and the steam end machine base 13, and bury the pipelines at the same time.
[0056] S4-4: The excitation end machine base 11 and the steam end machine base 13 are respectively hoisted to the two ends of the first intermediate machine base 121, the second intermediate machine base 122, and the third intermediate machine base 123 that have been lap-welded, and the excitation end machine base 11 and the steam end machine base 13 are adjusted to be concentric with the first intermediate machine base 121, the second intermediate machine base 122, and the third intermediate machine base 123, and the excitation end machine base 11 and the steam end machine base 13 are lap-welded. The excitation end plate 111 and the steam end plate 131 are lap-welded by the process support and the welding platform, respectively.
[0057] S5: The inspector remeasures the assembly dimensions and records them, and remeasures the inner circle dimensions of each spacer ring.
[0058] S6: Install and weld the hanging seat 18, and fully weld the hanging seat 18 and the internal spacer ring of the machine base 1. Weld the process support between the partitions before assembling the hanging seat 18. The horizontality and verticality of the hanging seat 18 are ≤1.5mm, and the gap between the hanging seat and the corresponding spacer ring is ≤2mm.
[0059] S8: Assemble the top outer cover plate 15 and the bottom outer cover plate 15, and fix them by spot welding. The gap between the top outer cover plate 15 and the bottom outer cover plate 15 and each layer of spacer ring is ≤2mm, and can be calibrated by flame.
[0060] S9: Assemble the foot 17, the excitation end base 114, the steam end base 134 and the outer air duct plate 16, spot weld the foot 17, the excitation end base 114, the steam end base 134 and the outer air duct plate 16, and then fully weld the weld. Before full welding, lay a walking platform inside the machine base.
[0061] S10: Weld 15 longitudinal welds between the outer cover plates.
[0062] S11: Install and weld the process dummy ring 19. The process dummy ring 19 is concentrically arranged with the excitation end plate and the steam end plate, and the process dummy ring 19 is welded and fixed with the excitation end plate and the steam end plate.
[0063] S12: The machine base 1 is hoisted onto the tire rolling seat 20 through the hoisting seat 18, and the process false ring 19 is in contact with the tire rolling seat 20.
[0064] S13: The machine base 1 is rotated and welded on the tire rolling base 20 through the process false ring 19, and the weld seams that are not fully welded before the welding are fully welded.
[0065] S14: Cleaning and sandblasting the machine base 1.
[0066] S14-1: Remove weld pox, check dimensions and welds, and perform flaw detection on welds.
[0067] S14-2: Block ports, screw holes, and through holes to protect machined surfaces.
[0068] S14-3: Sandblasting.
[0069] S14-4: Vibrate the machine base 1 to eliminate stress.
[0070] S14-5: Cut off the process false ring 19 and process support parts, and completely clean the machine base 1.
[0071] The above-mentioned steam turbine generator frame welding method: S13 comprises: S13-1: The machine base 1 is rotated and welded on the tire base 20, and the welds other than the internal fillet welds between the excitation end plate and the outer cover plate 15 and the fillet welds at the flat welding position between the spacer ring and the outer cover plate 15 are welded.
[0072] S13-2: The crane places the machine base 1 in an upright state through the climbing seat 18, and the steam end machine base 13 is placed on the upper side. The lifting workbench is lifted into the interior of the machine base 1.
[0073] S13-3: Weld the internal fillet welds of the excitation end plate 111 and the outer cover plate 15. Weld the fillet welds at the flat welding position between the excitation end spacer ring 112, the steam end spacer ring 132, the middle spacer ring 124 and the outer cover plate 15, and weld the above fillet welds to 1 / 2 of the weld foot.
[0074] S13-4: The crane rotates the machine base 1 180° through the climbing seat 18 and places the excitation end machine base 11 on the upper side.
[0075] S13-5: Weld the internal fillet welds of the excitation end plate 111 and the outer cover plate 15. Weld the fillet welds at the flat welding position between the excitation end spacer ring 112, the steam end spacer ring 132, the middle spacer ring 124 and the outer cover plate 15, and weld the above fillet welds to the drawing size.
[0076] S13-6: The crane lays the machine base 1 horizontally and welds the remaining parts.
[0077] The above-mentioned steam turbine generator frame welding method: S1-1 includes that when the CNC gas cutting machine is cutting, the parts are kept connected, the parts and the remaining steel plates are kept connected, and the parts are cut off after cooling.
[0078] The end plates include: an excitation end plate 111 and a steam end plate 131 .
[0079] The spacer rings include: an excitation end spacer ring 112 , a steam end spacer ring 132 , and a middle spacer ring 124 .
[0080] The above embodiments are exemplary, and their purpose is to illustrate the technical concept and features of the present invention so that people familiar with this field can understand the content of the present invention and implement it accordingly, and they cannot limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.
Claims
1. A steam turbine generator base, characterized in that: The invention comprises a machine base (1); the machine base (1) comprises an excitation end machine base (11), an intermediate machine base (12), a steam end machine base (13), a top plate (14), and an outer cover plate (15); the top plate (14) is a long plate, and top side plates (141) are respectively provided on both sides of the long sides of the top plate (14); the excitation end machine base (11), the intermediate machine base (12), and the steam end machine base (13) are placed between the two top side plates (141); the excitation end machine base (11), the intermediate machine base (12), and the steam end machine base (13) are welded to the top plate (14) in sequence. 4), the excitation end machine base (11), the intermediate machine base (12), the steam end machine base (13), and the top plate (14) together constitute the frame of the machine base (1), and the outer cover plate (15) is welded to the outer side of the frame of the machine base (1); an excitation end base (114) is welded to the lower side of the excitation end machine base (11), and a steam end base (134) is welded to the lower side of the steam end machine base (13); a base foot (17) is provided on the lower side of the intermediate machine base (12), and external air duct plates (16) are welded on both sides of the base foot (17), and the external air duct plates (16) form an air duct.
2. The steam turbine generator base according to claim 1, characterized in that: The excitation end machine base (11) comprises an excitation end end plate (111) and an excitation end spacer ring (112), wherein a plurality of the excitation end spacer rings (112) are provided; an excitation end support rib (113) is provided between the excitation end plate (111) and the excitation end spacer ring (112), wherein two ends of the excitation end support rib (113) are respectively connected to the excitation end plate (111) and the excitation end spacer ring (112); and the excitation end spacer ring (112) comprises an excitation end wide ring (1121) and an excitation end narrow ring (1122).
3. The steam turbine generator base according to claim 1, characterized in that: The steam end machine base (13) comprises a steam end end plate (131) and a steam end spacer ring (132), a plurality of steam end spacer rings (132) are provided, a steam end support rib (133) is provided between the steam end end plate (131) and the steam end spacer ring (132), two ends of the steam end support rib (133) are respectively connected to the steam end end plate (131) and the steam end spacer ring (132), and the steam end spacer ring (132) comprises a steam end wide ring (1321) and a steam end narrow ring (1322).
4. The steam turbine generator base according to claim 1, characterized in that: The intermediate machine base (12) comprises a first intermediate machine base (121), a second intermediate machine base (122), and a third intermediate machine base (123); the first intermediate machine base (121), the second intermediate machine base (122), and the third intermediate machine base (123) are welded to the top plate (14) along the top side plate (141).
5. The steam turbine generator base according to claim 1, characterized in that: The intermediate machine base (12) comprises a plurality of intermediate spacer rings (124) welded together, an intermediate support rod (125) is provided between two intermediate spacer rings (124), the intermediate support rod (125) intermediate spacer ring passes through all the intermediate spacer rings (124), and the intermediate support rod (125) connects all the intermediate spacer rings (124); the intermediate spacer rings (124) comprise an intermediate wide ring (1241) and an intermediate narrow ring (1242), and the intermediate wide ring (1241) and the intermediate narrow ring (1242) are arranged at intervals.
6. The steam turbine generator base according to claim 5, characterized in that: A windshield (1243) is provided between the middle spacer rings (124); the windshield (1243) is arranged between the middle spacer rings (124); and the windshield (1243) is arranged on the upper side of the machine base (1).
7. The steam turbine generator base according to claim 1, characterized in that: The machine base (1) is provided with hanging seats (18), and the hanging seats (18) are arranged in pairs on both sides of the machine base (1).
8. A welding method for a steam turbine generator frame according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: Prepare materials; S1-1: All parts are cut by CNC gas cutting machine, and all parts are cut out with bevels and polished flat by semi-automatic gas cutting machine; all parts are flattened by hydraulic press; S1-2: the outer cover plate (15) is bent into an arc shape using a plate rolling machine, and the outer air duct plate (16) is formed using a mold; S2: welding: welding the parts into end plates and spacer rings, welding support ribs between the end plates and spacer rings to form an excitation end machine base (11), a first intermediate machine base (121), a second intermediate machine base (122), a third intermediate machine base (123), and a steam end machine base (13); S3: Inspection: The inspector checks the dimensions of the parts and the welds according to the relevant standards; and performs flaw detection on the welds; S4: Assembly; S4-1: Draw the frame line and the cross center line on the welding platform, position the two top side panels (141) in the width direction, hang the top panel (14) between the two top side panels (141), draw the width center line on the top panel (14), and use the width center line of the top panel (14) as the assembly reference line; the top panel (14) and the top side panels (141) have a telescopic margin; S4-2: hoist the first intermediate machine base (121), the second intermediate machine base (122), and the third intermediate machine base (123) to the upper side of the top plate (14), adjust the concentricity of the first intermediate machine base (121), the second intermediate machine base (122), and the third intermediate machine base (123), so that the first intermediate machine base (121), the second intermediate machine base (122), and the third intermediate machine base (123) are concentric, adjust the verticality of the intermediate spacer ring (124) to meet the requirements of the drawing, and then lap weld and fix them; S4-3: welding the support pipes and ribs between the excitation end machine base (11), the first intermediate machine base (121), the second intermediate machine base (122), the third intermediate machine base (123), and the steam end machine base (13), and burying the pipelines at the same time; S4-4: Assemble the excitation end machine base (11) and the steam end machine base (13); hoist the excitation end machine base (11) and the steam end machine base (13) to the two ends of the first intermediate machine base (121), the second intermediate machine base (122), and the third intermediate machine base (123) respectively, adjust the excitation end machine base (11) and the steam end machine base (13) to be concentric with the first intermediate machine base (121), the second intermediate machine base (122), and the third intermediate machine base (123), and lap-weld the excitation end machine base (11) and the steam end machine base (13); S5: The inspector remeasures the assembly dimensions and records them, and remeasures the inner circle dimensions of the spacer ring; S6: Install and weld the hanging seat (18), and fully weld the hanging seat (18) and the internal spacer ring of the machine base (1); weld the process support between the partitions before assembling the hanging seat (18); S8: Assemble the top outer cover plate (15) and the bottom outer cover plate (15), and fix the top outer cover plate (15) and the bottom outer cover plate (15) by spot welding; S9: Assemble the base (17), the excitation end base (114), the steam end base (134) and the outer air duct plate (16), fix the base (17), the excitation end base (114), the steam end base (134) and the outer air duct plate (16) by spot welding, and then fully weld the weld seam; S10: welding the longitudinal welds between the outer cover plates (15); S11: installing and welding a process dummy ring (19); the process dummy ring (19) is respectively arranged concentrically with the excitation end plate and the steam end plate, and the process dummy ring (19) is respectively welded and fixed to the excitation end plate and the steam end plate; S12: The machine base (1) is hoisted onto the tire rolling seat (20) by means of the hoisting seat (18), so that the process false ring (19) is in contact with the tire rolling seat (20); S13: the machine base (1) is rotated and welded on the tire rolling base (20) through the process false ring (19), and the weld seams that were not fully welded before the welding are fully welded; S14: cleaning and sandblasting the machine base (1); S14-1: Remove weld pox, check dimensions and welds, and perform flaw detection on welds; S14-2: Block ports, screw holes, through holes, and protect the machined surface; S14-3: Sandblasting; S14-4: vibrate the machine base (1) to eliminate stress; S14-5: Cut off the process false ring (19) and process support parts, and completely clean the machine base (1).
9. The welding method according to claim 8, characterized in that: The S13 includes: S13-1: The machine base (1) is rotated and welded on the tire roller base (20), and the welds other than the internal fillet welds between the excitation end plate and the outer cover plate (15) and the fillet welds at the flat welding position between the spacer ring and the outer cover plate (15) are welded; S13-2: The crane places the machine base (1) in an upright state through the climbing seat (18), with the steam end machine base (13) placed on the upper side; and the lifting workbench is lifted into the interior of the machine base (1); S13-3: welding the internal fillet welds of the excitation end plate (111) and the outer cover plate (15); welding the fillet welds at the flat welding positions between the excitation end spacer ring (112), the steam end spacer ring (132), the middle spacer ring (124) and the outer cover plate (15), and welding the fillet welds to 1 / 2 of the weld foot; S13-4: The crane rotates the machine base (1) by 180 degrees through the climbing seat (18) and places the excitation end machine base (11) on the upper side; S13-5: welding the internal fillet welds of the excitation end plate (111) and the outer cover plate (15); welding the fillet welds at the flat welding positions between the excitation end spacer ring (112), the steam end spacer ring (132), the middle spacer ring (124) and the outer cover plate (15), and welding the above fillet welds to the size shown in the drawing; S13-6: The crane lays the machine base (1) horizontally and welds the remaining parts.
10. The welding method according to claim 8, characterized in that: The S1-1 includes that when the CNC gas cutting machine is unloading, the parts are kept connected, the parts and the remaining steel plates are kept connected, and the parts are cut off after cooling.