Reaction type stationary blade turning clamp

Abstract

The utility model discloses a reaction type stationary blade turning clamp, which comprises a positioning plate, a first pressing plate and a second pressing plate, the positioning plate comprises an annular plate body, an annular groove arranged on the plate body and a convex spigot arranged on one side of the groove, a blade root of a stationary blade is clamped with the convex spigot, a first gasket is arranged in the groove, and a second gasket is arranged in the groove. The blade crowns of the stator blades are sequentially arranged on the first gasket and are in a semicircular shape, a first equal-height block is arranged on one side of the blade root, the first pressing plate is arranged above the first equal-height block and the blade root and fixed to the positioning plate through the first bolt, and a cover plate is arranged at the tops of the blade crowns of the stator blades. The second pressing plate is arranged above the cover plate and the second equal-height block located on the workbench, and the second pressing plate is fixed through a second bolt. The blade root and the blade crown of the stator blade can be pressed, the stability of the stator blade in the machining process is guaranteed, shaking is avoided, and the machining quality is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of tooling fixtures for steam turbines, and more specifically, to a reaction-type stationary blade clamp. Background Technology

[0002] The reaction-type stator blade is completely different from the traditional stator blade diaphragm. The traditional stator blade structure uses inner and outer rings to weld the stator blades together in the middle to form a whole. However, the reaction-type stator blade eliminates the inner and outer ring structure, and each stator blade is an individual piece. This makes the manufacturing of the reaction-type stator blade more difficult.

[0003] Traditional stationary blades can be machined by simply placing them flat on a vertical lathe. However, since the stationary blades of reaction-type stationary blades are individual pieces with a certain degree of curvature, they are not suitable for direct machining on a vertical lathe. If the stationary blades are directly installed into the high-pressure inner cylinder and then the steam seal groove is machined, the stationary blades will constantly vibrate and spring back during the machining process, making it difficult to guarantee the quality of the steam seal groove.

[0004] Therefore, there is an urgent need for a reaction-type stationary blade fixture that can fix the reaction-type stationary blade, ensure stability during the machining process, prevent blade vibration, and ensure the machining quality of the steam seal body groove. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a reaction-type stationary blade clamp, which arranges and presses the stationary blades in a semi-circular shape and fixes them on the clamp. First, the steam seal groove is machined on the worktable. After machining, the stationary blades are installed into the high-pressure inner cylinder for use, so as to ensure that the product meets the technical requirements of the drawings.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A reaction-type stationary blade clamp includes a positioning plate, a first pressure plate, and a second pressure plate. The positioning plate includes an annular plate body, an annular groove on the plate body, and a convex stop on one side of the groove. The blade root of the stationary blade engages with the convex stop. A first washer is disposed in the groove. The blade crowns of several stationary blades are sequentially disposed on the first washer in a semi-circular arrangement. A first leveling block is provided on one side of the blade root. The first pressure plate is disposed above the first leveling block and the blade root and is fixed to the positioning plate by a first bolt. A cover plate is provided on the top of the blade crowns of several stationary blades. A second pressure plate is disposed above the cover plate and a second leveling block located on the worktable and is fixed by a second bolt.

[0008] A further technical solution involves a plurality of third leveling blocks located on a worktable around the outer ring of the positioning plate, and a plurality of jacks and fourth leveling blocks below the positioning plate. A third pressure plate is positioned on top of the third leveling blocks and the outer ring of the positioning plate, and is fixed to the worktable by a clamping device. When the positioning plate is placed on the worktable, it is first leveled using the fourth leveling blocks and jacks, and then fixed in place.

[0009] A further technical solution is that the clamping device includes a stud, a T-nut located at the bottom of the stud, a second washer fitted on the stud, and a nut fitted above the second washer.

[0010] In a further technical solution, the left and right ends of the annular groove of the positioning plate are respectively provided with mounting holes, and the two ends of the first washer are provided with screw holes. The positioning screws cooperate with the screw holes and mounting holes to quickly position the positioning plate.

[0011] In a further technical solution, the first washer is in the shape of a large semi-circular ring, and the size of the first washer is slightly smaller than that of the annular groove.

[0012] In a further technical solution, the cover plate is in the shape of a semi-circular ring.

[0013] A further technical solution involves arranging several stationary blades in a semi-circular shape along the circumference, with a limiting block on one side of each stationary blade at both ends, which fixes the entire stationary blade.

[0014] In a further technical solution, both the first and second pressure plates are provided with elongated holes. After the bolt passes through the elongated holes, the position of the pressure plates is adjusted and then tightened. Beneficial effects

[0015] Compared with the prior art, the present invention has the following significant advantages:

[0016] 1. This utility model uses the cooperation of a second pressure plate, a third pressure plate, etc., to press down the root and crown of the stationary blade respectively, ensuring the stability of the stationary blade during processing, avoiding shaking, and ensuring processing quality.

[0017] 2. This utility model can simultaneously meet the processing requirements of reaction-type stationary vane steam seal grooves of different grades, and has good versatility and strong practicality. Attached Figure Description

[0018] Figure 1 This is the front view of the present invention;

[0019] Figure 2 for Figure 1 AA view in the middle;

[0020] Figure 3 This is the front view of the positioning plate;

[0021] Figure 4 for Figure 3 AA view in the middle;

[0022] Figure 5 This is a schematic diagram of the clamping device;

[0023] Figure 6 This is a schematic diagram of the structure of the first washer;

[0024] Figure 7 This is a schematic diagram of the cover plate structure;

[0025] Figure 8 This is a schematic diagram of the structure of a reaction-type stationary blade;

[0026] The markings in the diagram are: 1. Third leveling block, 2. Jack, 3. Positioning plate, 4. First washer, 5. Cover plate, 6. First pressure plate, 7. First leveling block, 8. First bolt, 9. Second pressure plate, 10. Second bolt, 11. Second leveling block, 12. Clamping device, 13. Third pressure plate, 14. Third leveling block, 15. Limiting block, 16. Positioning pin; 3-1. Plate body, 3-2. Groove, 3-3. Protruding stop, 17. Stationary blade, 17-1. Blade root, 17-2. Blade crown; 12-1. Stud, 12-2. T-nut, 12-3. Second washer, 12-4. Nut. Detailed Implementation

[0027] The present invention will now be described in detail with reference to embodiments and application examples. It should be noted that the embodiments described are preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. The application and usage of the present invention are not limited to the application examples described. Example

[0028] like Figure 1-8 As shown, a reaction-type stationary blade clamp includes a positioning plate 3, a first pressure plate 6, and a second pressure plate 9. The positioning plate 3 includes an annular plate body 3-1, an annular groove 3-2 on the plate body, and a convex stop 3-3 on one side of the groove. The blade root 17-1 of the stationary blade 17 engages with the convex stop 3-3. A first washer 4 is disposed in the groove 3-2. The blade crowns 17-2 of several stationary blades 17 are sequentially disposed on the first washer 4 in a semi-circular arrangement. A first leveling block 7 is provided on one side of the blade root 17-1. The first pressure plate 6 is disposed above the first leveling block 7 and the blade root 17-1 and is fixed to the positioning plate 3 by a first bolt 8. A cover plate 5 is provided on the top of the blade crowns 17-2 of several stationary blades 17. The second pressure plate 9 is disposed above the cover plate 6 and the second leveling block 11 located on the worktable and is fixed by a second bolt 10.

[0029] The positioning plate 3 has several third leveling blocks 1 on the worktable 18 around its outer ring. Several jacks 2 and fourth leveling blocks 14 are located below the positioning plate 3. A third pressure plate 13 is positioned on top of the third leveling blocks 1 and the outer ring of the positioning plate 3. The third pressure plate 13 is fixed to the worktable 18 by a clamping device 12. When the positioning plate is placed on the worktable, it is first leveled using the fourth leveling blocks and jacks before being fixed.

[0030] The clamping device 12 includes a stud 12-1, a T-nut 12-2 located at the bottom of the stud, a second washer 12-3 fitted on the stud, and a nut 12-4 fitted above the second washer.

[0031] The positioning plate 3 has mounting holes 3-4 on both sides of the annular groove 3-2 at both ends, and the first washer 4 has screw holes 4-1 at both ends. The positioning screw 16 cooperates with the screw holes 4-1 and the mounting holes 3-4 to quickly position the positioning plate 3.

[0032] The first washer 4 is in the shape of a large semi-circular ring, and the size of the first washer 4 is slightly smaller than that of the annular groove 3-2. The cover plate 5 is in the shape of a semi-circular ring.

[0033] Several stationary blades are arranged in a semi-circular shape along the circumference. A limiting block 15 is provided on one side of the stationary blades at both ends to fix the entire stationary blade.

[0034] Both the first and second pressure plates are provided with elongated holes. After the bolt passes through the elongated holes, the position of the pressure plates is adjusted and then tightened.

[0035] The working method of this utility model is as follows:

[0036] 1. Place the positioning plate 3 on the CNC lathe worktable and level it using the fourth leveling block 1 and jack 2. Simultaneously, use the CNC vertical lathe's own grippers to round the positioning plate 3, ensuring it is concentric with the machine tool worktable. Place the clamping device in the strip-shaped T-slot of the worktable and use the clamping device 12, the third pressure plate 13, and the third leveling block 14 to firmly clamp the positioning plate 3 to the machine tool worktable.

[0037] 2. Based on the height difference H between the blade root and the blade crown, select a first washer of appropriate size, press the first washer into the groove of the positioning plate, screw the two positioning pins 17 into the pin holes of the washer and the mounting holes of the positioning plate, and tighten them to prevent the washer from rotating.

[0038] 3. Place several individual stationary blades sequentially onto the convex stop of the positioning plate, then use several first pressure plates 6 and first bolts 8 to press the blade root along the circumferential direction, cover the blade crown with a semi-circular cover plate 5, and use several second pressure plates 9 and second bolts 10 to press the cover plate along the circumferential direction. By pressing the blade crown with the cover plate 5, the stationary blades can be processed.

[0039] 4. Furthermore, after this device is installed on a lathe, it can be directly replaced with other stages of stationary blades for use in other units without changing the device itself, thus completing the machining of the stationary blade seal body groove. After machining a set of stationary blade seal body grooves, simply loosen the first bolt 8 and the first bolt 10, remove the stationary blade, replace the first washer 4 with one of appropriate thickness using the two locating pins 17, then install the stationary blade to be machined, tighten the bolts according to the above steps, and machining can begin.

[0040] This invention greatly improves processing efficiency. At the same time, one tooling can complete the processing of various stationary blade steam seal body grooves, which greatly reduces the cost of tooling fixtures.

Claims

1. A reaction vane carrier clamp comprising a positioning plate, a first pressure plate and a second pressure plate, characterized in that: The positioning plate includes a circular plate body, an annular groove on the plate body, and a convex stop on one side of the groove. The blade root of the stationary blade engages with the convex stop. A washer is placed in the groove. The blade crowns of several stationary blades are arranged in a semi-circular shape on the washer. A first leveling block is provided on one side of the blade root. A first pressure plate is provided above the first leveling block and the blade root and is fixed to the positioning plate by a first bolt. A cover plate is provided on the top of the blade crowns of several stationary blades. A second pressure plate is provided above the cover plate and the second leveling block located on the worktable and is fixed by a second bolt.

2. The reaction vane cart clamp of claim 1, wherein: The outer ring of the positioning plate is provided with several third level blocks located on the worktable. Several jacks and fourth level blocks are provided below the positioning plate. The third pressure plate is located on the top of the third level blocks and the outer ring of the positioning plate. The third pressure plate is fixed to the worktable by a clamping device.

3. The reaction vane cart clamp of claim 2, wherein: The clamping device includes a stud, a T-nut located at the bottom of the stud, a second washer fitted on the stud, and a nut fitted above the second washer.

4. The reaction vane cart clamp of claim 1, wherein: The positioning plate has mounting holes at both ends of the annular groove, and the first washer has screw holes at both ends. The positioning screws cooperate with the screw holes and mounting holes to quickly position the positioning plate.

5. The reaction vane cart clamp of claim 4, wherein: The first washer is in the shape of a large semi-circular ring, and the size of the first washer is slightly smaller than that of the annular groove.

6. The reaction vane cart clamp of claim 1, wherein: The cover plate is in the shape of a semi-circular ring.

7. The reaction vane cart clamp of claim 1, wherein: When the positioning plate is placed on the workbench, several third level blocks and jacks are provided below the positioning plate.

8. The reaction vane cart clamp of claim 1, wherein: After the stationary blades are fixed along the circumferential direction, the stationary blades at both ends are fixed by limiting blocks.

9. The reaction vane cart clamp of claim 1, wherein: Both the first and second pressure plates are provided with elongated holes. After the bolt passes through the elongated holes, the position of the pressure plates is adjusted and then tightened.

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