Guide vane holding ring positioning device

Abstract

The invention discloses a guide vane holding ring positioning device which is characterized in that a main body of the positioning device is a circular base (1), a plurality of equal-height blocks (3) and a plurality of sliding rails are circumferentially arrayed on the table top of the base at equal intervals, movable clamping jaws (2) are matched with the sliding rails, the equal-height blocks are used for supporting an annular partition plate outer ring (15), and the clamping jaws are used for fixing the annular partition plate outer ring (15). A sliding partition plate outer ring positioning plate (8) is arranged on a pair of equal-height blocks which are connected into a straight line, a circular lifting table (5) is arranged in the center of the table top of the base, and lifting table clamping jaws (2) are arranged on the circular lifting table in a circumferential array mode and used for fixing a partition plate inner ring (13). A plurality of blade supporting rings (4) are further placed and fixed on the equal-height blocks, saw belt teeth are enveloped on the outer circumferences of the blade supporting rings, and a pair of outer saw belt teeth (10) of an outer supporting ring (9) and a pair of inner saw belt teeth (12) of an inner supporting ring (11) with different radial thickness values are matched to support blades (14). According to the device, the universality is greatly improved, after the device is formed, only two saw belt teeth need to be newly designed for a new partition plate product, the tool cost can be reduced to thousands of yuan from the original hundreds of thousands of yuan, and meanwhile the storage space of the device is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of steam turbine fixtures, and particularly to a guide vane retaining ring positioning and welding device. Background Art

[0002] Existing steam turbine welding guide vane retaining ring devices have solved many difficult problems such as insufficient blade positioning accuracy, easy deformation during welding and heat treatment. For example, a welding guide vane retaining ring positioning fixture disclosed in a Chinese invention patent with the publication number CN101797674B uses an integral welding and assembly support. The welding and assembly support is processed from a thick circular ring plate into inner and outer circles, stepped surfaces, and inner and outer teeth. This fixture can achieve high-precision positioning of blades, but it does not have universality. For different diaphragms, a new set of welding and assembly supports needs to be designed. The cost of a single set of welding and assembly supports is around 20,000 - 150,000 yuan, and the number of diaphragms per year is about 20 - 30. Therefore, the processing cost of the fixtures reaches the million yuan level. The reuse rate of the same set of welding and assembly supports is extremely low. As the diaphragm specifications increase, the number of welding and assembly supports also increases, requiring a large amount of space for storage. The subsequent spot welding work of the blades is carried out manually, which requires a large amount of human resources.

[0003] That is, the existing devices cannot simultaneously meet the positioning and welding of retaining rings with different specifications and sizes, ensure the quality of the welded guide vane retaining rings, reduce waste of storage space, and improve work efficiency. Summary of the Invention

[0004] Embodiments of the present invention provide a positioning and welding device that can be reused and adapted to retaining ring diaphragms and guide vanes with different specifications and sizes.

[0005] The present invention adopts the following technical solution: A guide vane retaining ring positioning device, characterized in that: the main body of the positioning device is a circular base 1. On the base table surface, four equal-height blocks and four slide rails are circumferentially arrayed at equal intervals. A movable claw is fitted on the slide rail. The equal-height blocks are used to support the outer ring of the circular diaphragm, and the claw is used to fix the outer ring of the circular diaphragm. A sliding diaphragm outer ring positioning plate is provided on a pair of two equal-height blocks connected in a straight line. A circular lifting table is arranged at the center of the base table surface. Lifting table claws 2 are circumferentially arrayed on the circular lifting table for fixing the inner ring of the diaphragm; A number of blade support rings are also placed and fixed on the equal-height blocks. The outer circumference of the blade support ring is enveloped with sawtooth belts. The outer sawtooth belts of a pair of outer support rings with different radial thickness values and the inner sawtooth belts of the inner support ring cooperate to support the blades.

[0006] Preferably, there are 12 blade support rings in total. The minimum outer diameter is Φ510mm, the maximum outer diameter is Φ2470mm, and the radial thickness value of the support rings varies from the minimum to the maximum by 50 - 100mm.

[0007] Preferably, each of the equal-height blocks is equally spaced with 12 screw holes and 12 taper pin holes for positioning and fastening the support ring.

[0008] Preferably, when each blade support ring is manufactured, after being connected to the equal-height block, the taper pin holes and the turned circle dimensions are machined in coordination. It is fixed by several bolts, which can ensure the concentricity requirement between the support ring and the equal-height block when they are repeatedly assembled with the base.

[0009] Preferably, there is a stepped surface with a depth of 27 mm and a width of 5 mm on the outer circumference of the blade support ring, and an end face groove with a depth of 3 mm and a width of 1.8 mm on the stepped surface; the thickness of the saw blade teeth is 1.6 mm, and the length is determined by the matching blade support ring.

[0010] Preferably, there are 4 M5 screw holes symmetrically distributed on the left and right of the center line of the stepped circle of the blade support ring for assembling the saw blade teeth; there are 4 through holes corresponding to the screw holes distributed on the saw blade, and the through holes are Φ6 in size. During use, they are embedded in the 1.8 mm wide groove of the support ring and fastened with screws to envelope them on the stepped circle of the support ring.

[0011] Preferably, the outer saw blade teeth include a support inclined surface, which is an adjusting plate with an adjustable inclination angle. One end of the plate is rotatably connected to the outer saw blade teeth through a rotating shaft, and the other end of the adjusting plate is fixed to the outer saw blade teeth through a limiting groove and a fastening screw to adjust the rotation angle.

[0012] Preferably, the outer saw blade teeth are provided with angle adjustment scale lines to assist in indicating the angle adjustment of the adjusting plate, so that the adjustment angle of each adjusting plate is accurate or consistent.

[0013] Preferably, the circular lifting table is provided with 1 rotating mechanism. The rotating mechanism is a motor arranged at the center of the circular lifting table. The motor shaft is connected to the rotating shaft, and the top of the rotating shaft is horizontally installed with a measuring rod with a dial indicator through a groove; Preferably, the positioning device further includes a gantry frame horizontally installed across the circular base. There is 1 dividing plate and 1 manipulator installed on the gantry frame. The manipulator can realize the full-circle automatic spot welding of the blades through the dividing plate.

[0014] The above at least one technical solution adopted in the embodiment of the present invention can achieve the following beneficial effects: 1. In the above technical solution, a welding stay ring positioning device and a indexing spot welding method are provided. By using the base and the lifting table, the height difference between the inner and outer rings of the diaphragm can be eliminated. For blades of corresponding specifications and dimensions, corresponding blade support rings are selected. The 12 sets of blade support ring specifications adopted in the present invention are already applicable to the existing range of all diaphragm products. During assembly, any two blade support rings are selected and fixed on the equal-height blocks. The sawtooth belts corresponding to the design and processing are successively enveloped on the support rings, and thus the welding positioning of diaphragms and blades of different sizes can be achieved. Compared with a welding stay ring positioning fixture disclosed in a Chinese invention patent with the publication number CN101797674B, the versatility of the whole device is greatly improved. After the device is formed, for new diaphragm products, only 2 sawtooth belts need to be newly designed. The tooling cost can be reduced from more than a hundred thousand yuan to several thousand yuan, and at the same time, the storage space of the device is also reduced.

[0015] 2. In order to further improve the versatility of the positioning device, in the present invention, an adjusting plate with adjustable angle is adopted for the inclined plane of the outer sawtooth belt supporting the blade. Since there are blades with equal cross-sections and blades with variable cross-sections whose cross-sectional areas change according to a certain law along the blade height, the radian of the cross-sectional curve corresponding to the supporting point of different blades on the inclined plane of the outer support ring is different. The traditional sawtooth belt has a fixed inclined plane and cannot be adjusted. For different blades or different sizes of stay ring diaphragms, sawtooth belts of different specifications are required. However, with the angle adjusting plate in the present invention, a set of blade support rings and a set of outer and inner sawtooth belts can be used to support blades of different specifications and models, so that the angle adjusting plate can be adapted to the cross-sectional curves of different blades.

[0016] 3. Further, angle adjustment scale lines are provided on the sawtooth belt. For example, precise angle scale lines can be made according to the cross-sectional profiles of a certain 3 types of blades to achieve precise positioning.

[0017] 4. Moreover, a gantry, an indexing table and a manipulator are added to the equipment. The manipulator can realize the full-circle automatic spot welding of the blades through the indexing table, which greatly improves the working efficiency and reduces the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings: Figure 1 It is a schematic structural diagram of the present invention for placing several blade support rings.

[0019] Figure 2 It is a schematic diagram of the present invention for assembling the diaphragm.

[0020] Figure 3 It is a schematic structural diagram of the outer support ring.

[0021] Figure 4 Schematic diagram of the structure of the outer saw band teeth.

[0022] Figure 5 Schematic diagram of the structure of the inner saw band teeth.

[0023] Figure 6 Schematic diagram of the structure of the outer saw band teeth with an adjusting plate.

[0024] Reference numerals 1 - Circular base; 2 - Claw 3 - Equal-height block; 4 - Blade support ring 5 - Circular lifting platform; 6 - Rotating mechanism 7 - Measuring rod; 8 - Positioning plate 9 - Outer support ring; 10 - Outer saw band teeth 11 - Inner support ring; 12 - Inner saw band teeth 13 - Inner partition ring; 14 - Blade 15 - Outer partition ring 101 - Gantry; 102 - Indexing plate; 103 - Manipulator Detailed implementation manners

[0025] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following, in combination with the accompanying drawings and preferred embodiments, details the specific implementation manners, structures, features, and their effects according to the present invention as follows.

[0026] The following, in combination with the accompanying drawings, details the technical solutions provided by various embodiments of the present invention.

[0027] The guide vane carrier ring is one of the basic components of the steam turbine flow path part. It is the carrier of multiple-stage stationary blades. Depending on different parameters and characteristics, there can be one or more guide vane carrier rings of different specifications in a steam turbine. The structure of the guide vane carrier ring generally includes: the upper half of the guide vane carrier ring, guide vanes, the lower half of the guide vane carrier ring, bolt holes on the split surface, adjustment component lugs, positioning grooves, eccentric guide posts, and bottom channels of the lower half of the cylinder.

[0028] As Figure 1 、 2 shown, the present invention provides a guide vane carrier ring positioning device. The main body of this positioning device is a circular base 1. On the base tabletop, four rectangular metal equal-height blocks 3 and four slide rails are circumferentially arrayed at equal intervals. A movable claw 2 is fitted on the slide rails. Each equal-height block 3 has an angle of 90°, which is used to support the circular outer partition ring 15. The claw 2 is used to fix the circular outer partition ring. A sliding outer partition ring positioning plate 8 is provided on a pair of two equal-height blocks that are in a straight line, which is used to cooperate with the end face of the outer partition ring for positioning. As Figure 2As shown in the figure, a circular lifting table 5 is provided at the center of the base tabletop. Circumferentially arrayed lifting table claws 2 are provided on the circular lifting table 5 for cooperating with the lifting table to fix the inner ring 13 of the partition board.

[0029] The circular lifting table is provided with 1 rotating mechanism 6. The rotating mechanism is a motor provided at the center of the circular lifting table, and the motor rotating shaft is connected to a rotating shaft. The top of the rotating shaft is horizontally installed with a measuring rod 7 with a dial indicator through a groove.

[0030] The circular lifting table is provided with 1 rotating mechanism, 6 retractable claws and 1 measuring rod equipped with a dial indicator; 1 indexing plate and 1 manipulator are installed on the gantry. By using the claws on the base, the claws on the lifting table and the measuring rod, the concentricity of the inner and outer rings of the partition board can be guaranteed and the height difference between the two can be eliminated, realizing height difference matching.

[0031] The positioning device further includes a gantry 101 horizontally installed across the circular base. 1 indexing plate 102 and 1 manipulator 103 are installed on the gantry. The manipulator can realize the full-circle automatic spot welding of the blades through the indexing plate. 3. The manipulator realizes the full-circle automatic spot welding of the blades through the indexing plate. Compared with the original integral device and manual spot welding, the split-type welding guide vane holding ring positioning device and the indexing spot welding method save the storage space of tools, reduce the manufacturing cost and improve the production efficiency.

[0032] A number of blade support rings 4 are placed and fixed on the equal-height blocks. The outer circumference of the blade support ring is enveloped with sawtooth. The outer sawteeth 10 of a pair of outer support rings 9 with different radial thickness values and the inner sawteeth 12 of the inner support ring 11 cooperate to support the blades. In this embodiment, there are 12 blade support rings in total, the minimum outer diameter is Φ510mm, the maximum outer diameter is Φ2470mm, and the radial thickness value of the support ring from the minimum to the maximum has a variation of 50 - 100mm.

[0033] In order to ensure the concentricity of the blade support ring 4, each equal-height block is equidistantly distributed with 12 screw holes and 12 taper pin holes for positioning and fastening the blade support ring. When each blade support ring is manufactured, after being connected to the equal-height block, the taper pin holes and the turning circle size are machined. It is fixed by a number of bolts, and the concentricity requirement with the base can be guaranteed when the support ring and the equal-height block are repeatedly assembled.

[0034] As Figure 3 In an embodiment of the blade support ring as shown in the figure, there is a stepped surface with a depth of 27mm and a width of 5mm on the outer circumference of the blade support ring, and an end face groove with a depth of 3mm and a width of 1.8mm on the stepped surface.

[0035] As Figure 4 、 5As shown, the thickness of the inner saw blade teeth and the outer saw blade teeth is 1.6 mm, and the length of the blade support ring 4 is determined by the matching blade support ring. Both the outer saw blade teeth 10 and the inner saw blade teeth 12 are wire cut from a standard saw blade with a thickness of 1.6 mm according to the design drawing, and both are distributed with 4 Φ6 through holes for assembly.

[0036] The stepped circle of the blade support ring is symmetrically distributed with 4 M5 screw holes on both sides of the center line for assembling the saw blade teeth; there are 4 through holes corresponding to the screw holes on the saw blade, which are through holes with a size of Φ6. During use, they are embedded in the 1.8 mm wide groove of the support ring and fixed on the stepped circle of the support ring with screws. This threaded connection and fixation make the installation of the saw blade teeth convenient, and the strip-shaped saw blade teeth can also remain undeformed, making the position of the blade above the support accurate.

[0037] As Figure 6 shown, the outer saw blade teeth include a support inclined plane, which is an adjusting plate with an adjustable inclination angle. One end of the plate is rotatably connected to the outer saw blade teeth through a rotating shaft, and the other end of the adjusting plate is fixed to the outer saw blade teeth through a limit groove and a fastening screw to adjust the rotation angle.

[0038] The outer saw blade teeth are provided with angle adjustment scale lines to assist in indicating the angle adjustment of the adjusting plate, so that the adjustment angle of each adjusting plate is accurate or consistent.

[0039] The steps for assembling the partition plate in this embodiment are as follows: 1. Place the inner partition ring 13 on the jaws of the lifting table 5. Using the positioning plate 8 and the measuring rod 7 equipped with a dial indicator, rotate the rotating mechanism 6 to adjust the inner partition ring 13 to be concentric with the base 1; 2. Place the outer partition ring 15 and repeat the adjustment method in step 1 to make it concentric with the base 1; 3. Lift the lifting table 5 so that the height difference between the bottom surfaces of the inner partition ring 13 and the outer partition ring 15 meets the requirements of the design drawing; 4. Connect the outer support ring 9, the inner support ring 11 and the equal-height block; 5. The outer support ring 9 and the inner support ring 11 successively enclose the outer saw blade teeth 10 and the inner saw blade teeth 12 and are fastened with screws; 6. Place the blades 14 in sequence. The blades 14 are tangent to the inclined plane and the step surface of the outer saw blade teeth 10 and tangent to the step surface of the inner saw blade teeth 12 to achieve precise positioning of the blade installation position.

[0040] 7. Install the electric welding gun on the manipulator 103. After adjusting the spot welding position of the blades through the gantry 101, rotate the indexing plate 102 to automatically spot weld each blade 14 to the inner partition ring 13 and the outer partition ring 15 into one body.

[0041] When a pair of support rings is adopted, in order to match blades of different models, the adjusting plate needs to be adjusted to the support angle corresponding to the sectional profile curve of the blade, that is, the rotation angle of the adjusting plate is positioned according to the scale lines pre-scribed on the outer saw blade teeth, and the blade is placed after accurate positioning. In this way, a pair of support rings and saw blade teeth can be used for several blade models, which improves the versatility of the device. In addition, this adjustability also improves the adaptability of any two pairs of blade support rings, further increasing the versatility of the support rings, without being affected by the blade twist angle and the support inclined plane.

[0042] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the technical content disclosed above within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A stay ring positioning device for guide vanes, characterized in that: The main body of the positioning device is a circular base (1). On the base tabletop, several equal-height blocks (3) and several slide rails are arranged in a circumferential array at equal intervals. A movable claw (2) is fitted on the slide rail. The equal-height blocks are used to support the outer ring (15) of the circular partition, and the claws are used to fix the outer ring (15) of the circular partition. A sliding partition outer ring positioning plate (8) is provided on a pair of two equal-height blocks connected in a straight line. A circular lifting table (5) is arranged at the center of the base tabletop. Lifting table claws (2) are arranged in a circumferential array on the circular lifting table and are used to fix the inner partition ring (13). Several blade support rings (4) are also placed and fixed on the equal-height blocks. The outer circumference of the blade support ring is enveloped by saw blade teeth. The outer saw blade teeth (10) of a pair of outer support rings (9) with different radial thickness values and the inner saw blade teeth (12) of the inner support ring (11) cooperate to support the blade (14).

2. The stay ring positioning device according to claim 1, characterized in that, There are 12 blade support rings (4) in total. The minimum outer diameter is Φ510mm, the maximum outer diameter is Φ2470mm, and the radial thickness value of the support ring varies from the minimum to the maximum by 50 - 100mm.

3. The guide vane stay ring positioning device according to claim 1, characterized in that, Each equal-height block is equally spaced with 12 screw holes and 12 taper pin holes for positioning and fastening the support ring.

4. The stay ring positioning device according to claim 1, characterized in that, There is a stepped surface with a depth of 27mm and a width of 5mm on the outer circumference of the blade support ring. There is an end face groove with a depth of 3mm and a width of 1.8mm on the stepped surface. The thickness of the saw blade teeth is 1.6mm, and the length is determined by the matching blade support ring.

5. The guide vane carrier ring positioning device according to claim 1, characterized in that, Four M5 screw holes are symmetrically distributed about the center line on the stepped circle of the blade support ring for assembling the saw blade teeth. Four through holes corresponding to the screw holes are distributed on the saw blade. The through holes are Φ6 in size. During use, they are embedded in the 1.8mm-wide groove of the support ring and are enveloped on the stepped circle of the support ring with screws.

6. The guide vane stay ring positioning device according to claim 1, characterized in that, The outer saw blade teeth include a support inclined surface, which is an adjusting plate with an adjustable inclination angle. One end of the plate is rotatably connected to the outer saw blade teeth through a rotating shaft, and the other end of the adjusting plate is fixed to the outer saw blade teeth through a limiting groove and a fastening screw to adjust the rotation angle.

7. The stay ring positioning device according to claim 6, characterized in that, The outer saw blade teeth are provided with angle adjustment scale lines to assist in indicating the angle adjustment of the adjustment plate, so that the adjustment angle of each adjustment plate is accurate or consistent.

8. The guide vane stay ring positioning device according to claim 1, characterized in that, The circular lifting table includes a rotating mechanism. The rotating mechanism is a motor arranged at the center of the circular lifting table. The motor shaft is connected to a rotating shaft, and the top of the rotating shaft is horizontally installed with a measuring rod (7) with a dial indicator through a groove.

9. The stay ring positioning device according to claim 1, wherein The positioning device further includes a gantry (101) horizontally installed across the circular base. A dividing plate (102) and a manipulator (103) are installed on the gantry. The manipulator can realize the full-circle automatic spot welding of the blade through the dividing plate.

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