Cascade assembly tool for steam turbine

Abstract

The utility model relates to a cascade assembly tool for a steam turbine, and relates to the technical field of cascade assembly. Comprising a gantry sliding frame which is vertically supported at the upper end of a steam turbine shell and horizontally extends in the length direction of the steam turbine shell, and a translation sliding seat which is horizontally connected to the gantry sliding frame in a sliding mode in the length direction of the gantry sliding frame. The vertical moving sliding seat is vertically connected to the horizontal moving sliding seat in a sliding manner; the clamping assembly is arranged at the lower end of the vertical moving sliding seat and is used for clamping the stationary cascade; the clamping assembly comprises a semicircular pull head, winding steel wires and a chuck, wherein the winding steel wires are evenly distributed in the circumferential direction of the arc side end of the pull head at intervals and wound in the pull head, and the chuck is arranged at the end, away from the pull head, of each winding steel wire and fixed to the inner edge of the static cascade. The assembly tool has the beneficial effects that the assembly tool can be used for assembling stationary blade cascades with different sizes on the same steam turbine, and the assembly tool is more convenient.

Description

Technical Field

[0001] This utility model relates to the field of blade assembly technology, and in particular to a blade assembly tooling for steam turbines. Background Technology

[0002] A steam turbine has multiple working stages, with partitions between adjacent working stages. The core component of the partition is the blade cascade, which is the interstage passage for steam to enter the next stage.

[0003] Blades can be classified into two types according to their purpose: moving blades (also known as working blades, or simply blades) and stationary blades (also known as guide vanes). Moving blades are installed on the rotor impeller (in impulse turbines) or drum (in reaction turbines) and receive the high-speed steam flow ejected from the stationary blades. They convert the kinetic energy of the steam into the mechanical energy of the rotating shaft, causing the rotor to rotate. Stationary blades are installed on diaphragms or retaining rings. In the stationary blades, the steam pressure and temperature decrease, while the flow velocity increases, converting thermal potential energy into kinetic energy.

[0004] The assembly of the turbine blade cascade involves first inserting individual stationary blade cascades into the corresponding slots on the turbine casing, then aligning the moving blades with all the stationary blade cascades and inserting them, then covering the moving blades with the other half of the stationary blade cascade, and finally fixing the same group of stationary blade cascades to complete the assembly of the blade cascade. There are multiple groups of stationary blade cascades, and the diameter of each group of stationary blade cascades is different. Conventional tooling cannot accommodate the assembly of all stationary blade cascades. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a turbine blade assembly fixture, which solves the technical problem that conventional fixtures cannot be adapted to install stationary blades of different diameters.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0009] This utility model provides a turbine blade assembly fixture, including a gantry carriage vertically supported on the upper end of the turbine casing and extending horizontally along the length of the turbine casing, a translation slide block horizontally slidably connected to the gantry carriage along the length of the gantry carriage, a vertical slide block vertically slidably connected to the translation slide block, and a clamping assembly disposed at the lower end of the vertical slide block to clamp the stationary blade. The clamping assembly includes a semi-circular pull head, winding steel wires evenly spaced circumferentially along the arc side of the pull head and wound inside the pull head, and a clamp disposed at the end of the winding steel wire away from the pull head. The clamp is fixed to the inner edge of the stationary blade.

[0010] This utility model provides a turbine blade assembly fixture. When installing a turbine stationary blade cascade using this fixture, the entire gantry carriage is hoisted and fixed to the upper end of the turbine's lower casing. Then, the translation slide is moved to one side of the turbine casing, and the pull head is moved down to be coaxially aligned with the stationary blade cascade. The clamps are then pulled out, fixing them to the inner edges of the stationary blade cascade. The stationary blade cascade is then vertically hoisted using the vertical slide, and finally, the stationary blade cascade is moved to the designated installation position and placed in place. This solution allows the assembly fixture to assemble stationary blade cascades of different sizes on the same turbine, making it more convenient.

[0011] Optionally, the gantry carriage includes vertical supports at both ends on the upper end of the turbine casing, a horizontal frame connected to the top of the two vertical supports, and a stabilizing clamp rotatably connected to the bottom of the two vertical supports on opposite sides and abutting against the side of the turbine casing as it rotates.

[0012] By rotating and installing stabilizing clamps at the bottom of the vertical frame at one end away from each other, when the gantry carriage is supported on the upper surface of the turbine casing, the stabilizing clamps are rotated and held to the side of the turbine casing, thereby improving the gantry carriage's firmness, making it more stable and safer.

[0013] Optionally, one end of the stabilizing clamp that abuts against the side of the turbine casing is covered with a buffer rubber layer.

[0014] By setting a buffer rubber layer on one end face of the stabilizing clamp that abuts against the turbine casing, the stabilizing clamp contacts the turbine casing through the buffer rubber layer. This makes the clamping more stable and reduces frictional damage to the turbine casing caused by slight shaking of the entire gantry carriage during assembly.

[0015] Optionally, a horizontally arranged traveling slide is provided on the cross frame, and a traveling trolley is horizontally slidably arranged on the traveling slide. The translation slide is fixed to the lower end of the traveling trolley. Two long cylinders are vertically arranged on both sides of the traveling trolley at the upper end of the translation slide. The piston rods of the long cylinders are vertically downward and connected to the vertical translation slide. Two short chains connected to the upper end of the pull head are vertically spaced at the lower end of the vertical translation slide.

[0016] The traveling trolley moves horizontally on the traveling slide, thereby driving the translation slide to move horizontally. Then, the vertically set long cylinder drives the vertical slide to move vertically. Finally, the pull head is connected to the lower end of the vertical slide through two short chains. On the one hand, when the traveling trolley drives all components to move horizontally, the clamping assembly is more stable and its shaking is reduced. On the other hand, the short chains make it easier for the stationary blades held by the clamping assembly to be inserted into the corresponding grooves on the turbine casing in the vertical direction, which is more convenient.

[0017] Optionally, an auxiliary component is slidably disposed on one of the opposite ends of the vertical frame along the length direction. The auxiliary component includes an auxiliary frame that is slidably connected to the vertical frame at both ends, an auxiliary cylinder that is evenly and horizontally arranged from top to bottom on one end of the auxiliary frame, and an auxiliary drag rod that is coaxially disposed at the end of the piston rod of the auxiliary cylinder. The auxiliary component and the translation slide slide synchronously, and the auxiliary drag rod translates and abuts against the outer edge of the stationary blade grid.

[0018] Individual stator vanes are also quite heavy; the larger the diameter, the greater the mass. In this solution, by setting up auxiliary components, the piston rod of the auxiliary cylinder extends horizontally and abuts against the outer edge of the stator vane through the auxiliary drag rod when the stator vane is clamped and moved, thereby providing support and making the transport and installation of the stator vane more convenient and safer.

[0019] Optionally, a buffer rubber pad is provided at the end of the auxiliary tow bar away from the auxiliary cylinder, and the inclination angle of the buffer rubber pad on the multiple auxiliary tow bars from top to bottom gradually increases.

[0020] By setting a buffer rubber pad at the end of the auxiliary trailing rod and setting the buffer rubber pad in an inclined shape with the inclination angle gradually increasing from top to bottom, the buffer rubber pad fits more closely to the outer edge of the stationary blade grid, thus providing more stable support.

[0021] Optionally, one end of the gantry carriage is provided with a placement frame for vertically placing the stationary blade grid. The placement frame has a slot vertically opened for inserting the stationary blade grid. The placement frame is provided with a positioning clamp group inside the slot for positioning stationary blade grids of different sizes.

[0022] By setting a placement frame at one end of the gantry carriage, the stationary blade grid can be placed into the slot of the placement frame before assembly, and then positioned by the positioning clamping group, which facilitates the subsequent clamping of the stationary blade grid.

[0023] Optionally, the positioning clamp assembly includes two positioning cylinders spaced apart and a positioning clamping piece disposed at the end of the piston rod of the positioning cylinder. The positioning clamping piece is made of hard rubber, and the two positioning cylinders are inclined upwards and facing each other.

[0024] By setting the positioning cylinders to be tilted and facing each other, and setting the positioning clamp at the end of the piston rod of the positioning cylinders, the two positioning cylinders can extend or retract the piston rod according to the diameter of the stationary vane. When the positioning clamp abuts against the outer edge of the stationary vane, the upper end of the stationary vane is exposed in the slot, which facilitates the subsequent clamping of the stationary vane.

[0025] Optionally, the slot is flared along the length of the gantry carriage, and the placement rack is provided with a rubber sheet on the inner wall of the slot.

[0026] By setting the slot in a flared shape and placing a rubber sheet on the inner wall of the slot, the stationary vane gate is made easier and safer to insert into the slot.

[0027] (III) Beneficial Effects

[0028] The beneficial effects of this utility model are as follows: When installing the turbine stationary blade cascade using this assembly fixture, the entire gantry carriage is hoisted and fixed to the upper end of the turbine's lower casing. Then, the translation slide is moved to one side of the turbine casing, and the pull head is moved down to be coaxially aligned with the stationary blade cascade. Then, the clamps are pulled out so that they are fixed to the inner edge of the stationary blade cascade. The stationary blade cascade is then vertically hoisted by the vertical sliding slide, and finally, the stationary blade cascade is moved to the designated installation position and placed in place. This solution allows the assembly fixture to assemble stationary blade cascades of different sizes on the same turbine, making it more convenient. Attached Figure Description

[0029] Figure 1 This is a perspective view of an embodiment of the present utility model;

[0030] Figure 2 This is a cross-sectional view of an embodiment of the present utility model.

[0031] [Explanation of Labels in the Attached Image]

[0032] 1. Gantry carriage; 11. Vertical frame; 12. Horizontal frame; 121. Traveling slide; 122. Traveling trolley; 13. Stabilizing clamp; 131. Buffer rubber layer; 2. Translation slide; 21. Long cylinder; 3. Vertical slide; 31. Short chain; 4. Clamping assembly; 41. Pull head; 42. Winding wire; 43. Clamp; 5. Auxiliary assembly; 51. Auxiliary frame; 52. Auxiliary cylinder; 53. Auxiliary drag bar; 54. Buffer rubber pad; 6. Placement frame; 61. Slot; 62. Positioning cylinder; 63. Positioning clamp. Detailed Implementation

[0033] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] The turbine blade assembly fixture proposed in this embodiment allows for the installation of turbine stator blades using this fixture. The entire gantry carriage is hoisted and fixed to the upper end of the turbine's lower casing. Then, the translational slide is moved to one side of the turbine casing, and the pull head is lowered to align coaxially with the stator blade. The clamps are then pulled out and fixed to the inner edges of the stator blade. The stator blade is then vertically hoisted using the vertical slide, and finally moved to the designated installation position and placed in place. This design allows for the assembly of stator blades of different sizes on the same turbine, making the process more convenient.

[0035] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0036] Reference Figure 1 and Figure 2 A turbine blade assembly fixture includes a gantry slide 1 vertically supported on the upper end of the turbine casing and extending horizontally along the length of the turbine casing, a translation slide 2 horizontally slidably connected to the gantry slide 1 along the length of the gantry slide 1, a vertical slide 3 vertically slidably connected to the translation slide 2, and a clamping assembly 4 disposed at the lower end of the vertical slide 3 to clamp the stationary blades.

[0037] The gantry carriage 1 includes vertical supports 11 at both ends, which are vertically supported on the upper end of the turbine casing; a horizontal frame 12, which is horizontally welded to the top of the two vertical supports 11; and a stabilizing clamp 13, which is rotatably connected to the bottom of the two vertical supports 11 at opposite ends and abuts against the side end of the turbine casing as it rotates. A cylinder that drives the stabilizing clamp 13 to rotate is rotatably connected to the side end of the vertical supports 11 via a rotating shaft. The end of the stabilizing clamp 13 that abuts against the side end of the turbine casing is covered with a buffer rubber layer 131. When the gantry carriage 1 is supported on the upper surface of the turbine casing, the stabilizing clamp 13 is rotated to clamp the side end of the turbine casing, thereby improving the firmness and stability of the gantry carriage 1. The stabilizing clamp 13 contacts the turbine casing through the buffer rubber layer 131, which on the one hand makes the clamping more stable, and on the other hand reduces the frictional damage to the turbine casing caused by slight shaking of the entire gantry carriage 1 during assembly.

[0038] A traveling slide 121 is horizontally welded along the length of the cross frame 12. A traveling trolley 122 is horizontally slidably mounted on the traveling slide 121. A translation slide 2 is fixed to the lower end of the traveling trolley 122 by bolts. Two long cylinders 21 are vertically fixed to the upper end of the translation slide 2 on both sides of the traveling trolley 122 by bolts. The piston rods of the long cylinders 21 are vertically downward and connected to the vertical slide 3 by bolts. Two short chains 31 are vertically spaced at the lower end of the vertical slide 3. The clamping assembly 4 is fixed to the lower end of the two short chains 31. The traveling trolley 122 travels horizontally on the traveling slide rail 121, thereby driving the translation slide 2 to move horizontally. Then, the vertically set long cylinder 21 drives the vertical slide 3 to move vertically. Finally, the clamping assembly 4 is connected to the lower end of the vertical slide by two short chains 31. On the one hand, when the traveling trolley 122 drives all the components to move horizontally, the clamping assembly 4 is more stable and its shaking is reduced. On the other hand, with the help of the short chains 31, the stationary blade grid clamped by the clamping assembly 4 can be more easily inserted into the corresponding groove on the turbine casing in the vertical direction, which is more convenient.

[0039] The clamping assembly 4 includes a semi-circular pull head 41, winding steel wires 42 evenly spaced along the circumferential arc side of the pull head 41 and wound inside the pull head 41, and a clamp 43 disposed at the end of the winding steel wires 42 away from the pull head 41. The clamp 43 clamps and fixes the clamp to the inner edge of the stationary blade grating. When installing the stationary blade grating for the turbine using this assembly fixture, the pull head 41 is moved down to be coaxially aligned with the stationary blade grating, and then the clamp 43 is pulled out, so that the clamp 43 is fixed to the inner edge of the stationary blade grating. This allows the assembly fixture to assemble stationary blade gratings of different sizes on the same turbine.

[0040] An auxiliary component 5 is slidably mounted along the length of one of the opposite ends of the vertical frame 11. The auxiliary component 5 includes an auxiliary frame 51 slidably connected to the vertical frame 11 at both ends, auxiliary cylinders 52 evenly and horizontally arranged from top to bottom on one end of the auxiliary frame 51, and auxiliary drag rods 53 coaxially mounted at the piston rod end of the auxiliary cylinders 52. The auxiliary component 5 slides synchronously with the translation slide block 2. The auxiliary drag rods 53 translate and abut against the outer edge of the stationary vane. A buffer rubber pad 54 is provided at the end of the auxiliary drag rods 53 away from the auxiliary cylinders 52. The inclination angle of the buffer rubber pads 54 on the multiple auxiliary drag rods 53 gradually increases from top to bottom. When clamping and moving the stationary vane, the piston rod of the auxiliary cylinders 52 extends horizontally and abuts against the outer edge of the stationary vane through the auxiliary drag rods 53, thus providing support. This makes the transport and installation of the stationary vane more convenient, stable, and safe.

[0041] One end of the gantry carriage 1 is bolted to a placement frame 6 for vertically placing the stationary vane grid. The placement frame 6 has a vertically opening slot 61 for inserting the stationary vane grid. Inside the slot 61, the placement frame 6 has a positioning clamping assembly for positioning stationary vane grids of different sizes. The positioning clamping assembly includes two spaced-apart positioning cylinders 62 and a positioning clamping piece 63 located at the end of the piston rod of the positioning cylinders 62. The positioning clamping piece 63 is made of hard rubber. The two positioning cylinders 62 are inclined upwards and facing each other. The slot 61 is flared along the length of the gantry carriage 1, and a rubber sheet is provided on the inner wall of the slot 61 of the placement frame 6. When assembling the stationary vane grid, the stationary vane grid can be first placed into the slot 61 of the placement frame 6. The two positioning cylinders 62 can extend or retract their piston rods according to the diameter of the stationary vane grid, so that when the positioning clamping piece 63 abuts against the outer edge of the stationary vane grid, the upper end of the stationary vane grid protrudes from the slot 61, thus facilitating subsequent clamping of the stationary vane grid.

[0042] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0044] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0045] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0046] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A turbine blade assembly fixture, characterized in that: The system includes a gantry slide (1) that is vertically supported on the upper end of the turbine casing and extends horizontally along the length of the turbine casing; a translation slide (2) that slides horizontally along the length of the gantry slide (1) and is connected to the gantry slide (1); a vertical slide (3) that slides vertically along the translation slide (2); and a clamping assembly (4) that is located at the lower end of the vertical slide (3) and clamps the stationary blade grid. The clamping assembly (4) includes a semi-circular pull head (41), a winding wire (42) that is evenly spaced along the circumferential arc side of the pull head (41) and wound inside the pull head (41), and a clamp (43) located at the end of the winding wire (42) away from the pull head (41). The clamp (43) is fixed to the inner edge of the stationary blade grid.

2. The turbine blade assembly fixture as described in claim 1, characterized in that: The gantry carriage (1) includes a vertical frame (11) that is vertically supported at both ends on the upper end of the turbine casing, a horizontal frame (12) that is horizontally connected to the top of the two vertical frames (11), and a stabilizing clamp (13) that is rotatably connected to the bottom of the two vertical frames (11) on opposite sides and abuts against the side of the turbine casing as it rotates.

3. The turbine blade assembly fixture as described in claim 2, characterized in that: The end of the stabilizing clamp (13) that abuts against the side of the turbine casing is covered with a buffer rubber layer (131).

4. The turbine blade assembly fixture as described in claim 2, characterized in that: A horizontally arranged walking slide (121) is provided on the cross frame (12), and a walking trolley (122) is horizontally slidably arranged on the walking slide (121). The translation slide (2) is fixed to the lower end of the walking trolley (122). Two long cylinders (21) are vertically arranged on both sides of the walking trolley (122) at the upper end of the translation slide (2). The piston rod of the long cylinder (21) is vertically downward and connected to the vertical sliding slide (3). Two short chains (31) connected to the upper end of the pull head (41) are vertically spaced at the lower end of the vertical sliding slide (3).

5. The turbine blade assembly fixture as described in claim 2, characterized in that: An auxiliary component (5) is slidably disposed on one end face of the vertical frame (11) that is far apart from each other along the length direction. The auxiliary component (5) includes an auxiliary frame (51) that is slidably connected to the vertical frame (11) at both ends, an auxiliary cylinder (52) that is evenly arranged horizontally from top to bottom on one end face of the auxiliary frame (51), and an auxiliary drag rod (53) that is coaxially disposed at the end of the piston rod of the auxiliary cylinder (52). The auxiliary component (5) and the translation slide (2) slide synchronously. The auxiliary drag rod (53) translates and abuts against the outer edge of the stationary blade grid.

6. The turbine blade assembly fixture as described in claim 5, characterized in that: The auxiliary tow bar (53) is provided with a buffer rubber pad (54) at the end away from the auxiliary cylinder (52), and the inclination angle of the buffer rubber pad (54) on the multiple auxiliary tow bars (53) from top to bottom gradually increases.

7. The turbine blade assembly fixture as described in claim 1, characterized in that: One end of the gantry carriage (1) is provided with a placement frame (6) for vertically placing the stationary blade grid. The placement frame (6) is vertically provided with a slot (61) for placing the stationary blade grid. The placement frame (6) is provided with a positioning clamp group for positioning stationary blade grids of different sizes inside the slot (61).

8. The turbine blade assembly fixture as described in claim 7, characterized in that: The positioning clamp assembly includes two positioning cylinders (62) spaced apart and a positioning clamp (63) disposed at the end of the piston rod of the positioning cylinder (62). The positioning clamp (63) is made of hard rubber, and the two positioning cylinders (62) are inclined upward and facing each other.

9. The turbine blade assembly fixture as described in claim 7, characterized in that: The slot (61) is flared along the length of the gantry carriage (1), and the placement rack (6) is provided with a rubber sheet on the inner wall of the slot (61).

Images