Universal fixture for milling regulating stage moving blade fir tree type blade root of steam turbine

Abstract

The utility model relates to a clamp, in particular to a general clamp for milling a regulating stage moving blade fir tree type blade root of a steam turbine, which comprises four supports, the tops of the four supports are connected with guide frames and form two groups of vertical frames, each group of vertical frames comprises two supports and two guide frames, and mounting plates are symmetrically arranged between the two groups of vertical frames. Electric sliding rails are arranged on the mounting plate in parallel, a moving frame is connected to the electric sliding rails in a sliding mode, supporting rods are connected to the moving frame in parallel in a sliding mode, and arc-shaped clamping plates are connected to the ends, away from the moving frame, of the supporting rods and used for being matched with fir-tree-shaped blade roots of the steam turbine regulating stage moving blades in an abutting mode. The moving frame is driven by the electric sliding rail to move in the direction of the regulating stage moving blade of the steam turbine until the arc-shaped clamping plate is tightly attached to and abuts against the fir-tree-shaped blade root of the blade, and accurate horizontal positioning is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a clamp especially relates to a kind of milling turbine governing stage moving blade fir-tree type blade root general fixture. BACKGROUND

[0002] Turbine governing stage moving blade is one of very important components in steam turbine, mainly responsible for regulating the steam flow into steam turbine, thereby controlling the output power of steam turbine. The design and manufacturing quality of these blades directly affect the efficiency, reliability and service life of steam turbine. Fir-tree type blade root is one of common blade root forms of turbine governing stage moving blade, similar to fir tree, can provide good fixing effect and high bearing capacity.

[0003] In the process of steam turbine manufacturing and maintenance, milling fir-tree type blade root of governing stage moving blade is a key process, directly affects the performance and efficiency of steam turbine. This work requires high-precision machining technology to ensure that the shape, size and surface quality of blade meet the design requirements. To ensure the accurate milling operation of the fir-tree type blade root of the governing stage moving blade, a clamp is needed to hold the fir-tree type blade root of the governing stage moving blade. However, the traditional clamp is difficult to achieve high-precision positioning, resulting in large size deviation of the processed blade, affecting the overall performance of the steam turbine; the traditional clamp is prone to looseness or displacement during processing, affecting the processing quality and safety.

[0004] Therefore, it is necessary to design a milling turbine governing stage moving blade fir-tree type blade root general fixture with accurate positioning and firm clamping. SUMMARY

[0005] The technical scheme of the utility model is: a kind of milling turbine governing stage moving blade fir-tree type blade root general fixture, including four supports, four supports top are all connected with guide frame and form two groups of stands, each group of stand contains two supports and two guide frames, two groups of the stand are symmetrically provided with mounting plate, mounting plate is provided with electric sliding rail in parallel, electric sliding rail is slidably connected with moving frame, moving frame is slidably connected with support rod in parallel, support rod is connected with arc clamping plate at the end away from moving frame, arc clamping plate is used to abut with the fir-tree type blade root of turbine governing stage moving blade.

[0006] As a preferred technical scheme of the utility model, second threaded rod is rotatably connected on moving frame, second threaded rod is connected with second motor mounted on moving frame, second threaded rod is screwed through support rod, and second threaded rod rotates to drive support rod to move horizontally along moving frame.

[0007] As a preferred technical scheme of the utility model, the first n-shaped frame is slidably connected between the two guide frames of each group of vertical frames, the second n-shaped frame is connected between the first n-shaped frames on the two vertical frames, the lower end of the second n-shaped frame is connected with a connecting plate, the electric push rod is installed on the connecting plate, the movable end of the electric push rod is connected with a bidirectional screw rod, the bidirectional screw rod slides through the vertical plate at the bottom of the connecting plate, the hook is threadedly connected on the two screw grooves of the bidirectional screw rod, the hook is rotatably connected with the vertical plate at the bottom of the connecting plate, and the hook is used for hooking the turbine governing stage moving blade.

[0008] As a preferred technical scheme of the utility model, the arc-shaped fixing plate is installed on the longitudinal outer wall of the second n-shaped frame, the sleeve is installed at the lower end of the arc-shaped fixing plate, the movable rod is slidably connected in the sleeve, the elastic member is arranged between the end of the movable rod in the inner cavity of the sleeve and the inner wall of the sleeve, and the end of the movable rod away from the sleeve is used for abutting against the turbine governing stage moving blade.

[0009] As a preferred technical scheme of the utility model, the end of the movable rod away from the sleeve is provided with a friction block.

[0010] As a preferred technical scheme of the utility model, the first motor is installed on at least one support of each group of vertical frames, the first threaded rod is connected on the output shaft of the first motor, the first threaded rod is parallel to the guide frame, and the first threaded rod is threadedly connected through the first n-shaped frame.

[0011] Beneficial effects: 1. The moving frame is driven to move towards the direction of the turbine governing stage moving blade through the electric sliding rail, until the arc-shaped clamping plate is tightly combined with the fir tree type blade root of the blade and abuts against, accurate horizontal positioning is realized, the second threaded rod is driven to rotate through the second motor, the gap between the supporting rod and the arc-shaped clamping plate is flexibly adjusted according to the interval of the fir tree type blade root of the blade, and it is ensured that each blade can be accurately limited.

[0012] 2. The bidirectional screw rod is horizontally moved through the electric push rod, the two threaded grooves of the bidirectional screw rod respectively drive two hooks to move towards each other, the turbine moving blade is firmly clamped, it is ensured that the turbine moving blade will not be loose or displaced in the processing process, and the movable rod on the arc-shaped fixing plate is further pressed against the turbine moving blade under the action of the elastic member, and additional fixing effect is provided. DRAWINGS

[0013] Figure 1 It is a three-dimensional structure schematic view of the utility model.

[0014] Figure 2 It is a part of three-dimensional structure schematic view of the utility model.

[0015] Figure 3 It is a three-dimensional structure schematic view of the connecting plate, bidirectional screw rod, hook and electric push rod of the utility model.

[0016] Figure 4 It is a three-dimensional structure schematic view of the utility model arc-shaped fixed plate, moving rod, elastic member and friction block.

[0017] Figure 5 It is a three-dimensional structure schematic view of the utility model arc-shaped fixed plate, moving rod, elastic member and friction block.

[0018] In the figure, marks: 1- support, 2- guide frame, 3- first n-shaped frame, 31- second n-shaped frame, 4- first motor, 5- first threaded rod, 6- connecting plate, 7- bidirectional screw rod, 8- hook, 9- electric push rod, 10- mounting plate, 11- electric slide rail, 12- moving frame, 13- support rod, 14- second threaded rod, 141- second motor, 15- arc-shaped clamping plate, 16- arc-shaped fixed plate, 161- sleeve, 17- moving rod, 18- elastic member, 19- friction block. DETAILED DESCRIPTION

[0019] The utility model will be further described in detail below in combination with the drawings and specific embodiments, but not limit the protection scope and application scope of the utility model.

[0020] Embodiment: a general fixture for milling steam turbine governing stage moving blade fir-tree type blade root, as shown in Figure 1 、 Figure 2 and Figure 4 , including four supports 1, guide frame 2, mounting plate 10, electric slide rail 11 and arc-shaped clamping plate 15, four supports 1 top are connected with guide frame 2 and form two groups of stands, and each group of stand contains two supports 1 and two guide frames 2, and the first n-shaped frame 3 is slidably connected between the two guide frames 2 of each group of stand, and the second n-shaped frame 31 is connected between the first n-shaped frame 3 on the two stands, and the first motor 4 is installed on at least one support 1 of each group of stand, and the first threaded rod 5 is connected on the output shaft of the first motor 4, and the first threaded rod 5 is parallel with the guide frame 2 and the first threaded rod 5 is screwed through the first n-shaped frame 3, and the first n-shaped frame 3 is driven to ascend and descend along the guide frame 2 by driving the first threaded rod 5 to rotate by the first motor 4, so that the height of the first n-shaped frame 3 is adjusted, and the second n-shaped frame 31 reaches the appropriate vertical position, so that the vertical positioning of the n-shaped frame 31 is realized, and the mounting plate 10 is symmetrically arranged between the two groups of stands, and the mounting plate 10 is arranged on both sides of the steam turbine governing stage moving blade, and the electric slide rail 11 is arranged in parallel on the mounting plate 10, and the moving frame 12 is slidably connected on the electric slide rail 11, and the support rod 13 is slidably connected on the moving frame 12 in parallel, and the arc-shaped clamping plate 15 is connected on the end of the support rod 13 away from the moving frame 12, and the arc-shaped clamping plate 15 is used for abutting and cooperating with the fir-tree type blade root of the steam turbine governing stage moving blade, and the horizontal positioning of the fir-tree type blade root of the steam turbine governing stage moving blade is realized by the close abutment of the arc-shaped clamping plate 15 and the fir-tree type blade root.

[0021] As Figure 4 shown in FIG. 1, the second threaded rod 14 is rotatably connected to the moving frame 12, the second threaded rod 14 is connected with the second motor 141 installed on the moving frame 12, the second threaded rod 14 is threaded through the support rod 13, the second threaded rod 14 drives the support rod 13 to move horizontally along the moving frame 12 by rotating, and the second motor 141 drives the second threaded rod 14 to rotate, so as to adjust the spacing between the moving frames 12, thereby adapting to the different spacing requirements of the turbine regulating stage blades.

[0022] As Figure 3 shown in FIG. 1, the lower end of the second n-shaped frame 31 is connected with the connecting plate 6, the electric push rod 9 is installed on the connecting plate 6, the movable end of the electric push rod 9 is connected with the bidirectional screw rod 7, the bidirectional screw rod 7 slides through the vertical plate at the bottom of the connecting plate 6, the hooks 8 are threadedly connected to the two threaded grooves of the bidirectional screw rod 7, the hooks 8 are rotatably connected with the vertical plate at the bottom of the connecting plate 6, the hooks 8 are used to hook the turbine regulating stage blades, the bidirectional screw rod 7 is driven to move horizontally by the telescopic function of the electric push rod 9, thereby driving the hooks 8 to rotate along the bidirectional screw rod 7, so as to realize the firm clamping or releasing of the hooks 8 on the turbine blades, and when the hooks 8 firmly clamp the turbine blades, the turbine blades can be ensured not to loosen or shift during the machining process.

[0023] As Figure 1 and Figure 5 shown in FIG. 1, the arc-shaped fixed plate 16 is installed on the longitudinal outer wall of the second n-shaped frame 31, the sleeve 161 is installed at the lower end of the arc-shaped fixed plate 16, the moving rod 17 is slidably connected in the sleeve 161, the elastic member 18 is arranged between the end of the inner cavity of the sleeve 161 and the inner wall of the sleeve 161, the end of the moving rod 17 away from the sleeve 161 is used to abut against the turbine regulating stage blades, the end of the moving rod 17 away from the sleeve 161 is provided with the friction block 19, the friction block 19 is used to increase the friction coefficient between the moving rod 17 and the turbine blades, and further fix the turbine blades, thereby providing convenience for the machining of the turbine blades.

[0024] In use, the moving frame 12 is driven by the electric sliding rail 11 to move towards the direction of the turbine governing stage moving blade until the arc-shaped clamping plate 15 is tightly abutted with the fir-tree type blade root of the turbine governing stage moving blade, thereby limiting the position of the fir-tree type blade root of the turbine governing stage moving blade for subsequent processing; the support rod 13 is driven by the second motor 141 to rotate the second threaded rod 14 to drive the support rod 13 to move horizontally along the moving frame 12, thereby adjusting the gap between the support rod 13 and the arc-shaped clamping plate 15 according to the interval between the fir-tree type blade roots of the turbine governing stage moving blade, so as to effectively limit the position of the fir-tree type blade root of the turbine governing stage moving blade; then, the first threaded rod 5 is driven by the first motor 4 to rotate, and the height of the first n-shaped frame 3 is adjusted by the first threaded rod 5, so that the second n-shaped frame 31 reaches a suitable vertical position; then, the electric push rod 9 drives the bidirectional screw rod 7 to move horizontally by the telescopic function, and the two threaded grooves of the bidirectional screw rod 7 drive the two hooks 8 to move towards each other to firmly clamp the turbine moving blade; at the same time, the moving rod 17 on the arc-shaped fixed plate 16 is further pressed against the turbine moving blade under the action of the elastic member 18, so as to ensure the stable fixation of the turbine moving blade; after the above steps are completed, the milling machine or other processing equipment is started, and the turbine moving blade is processed according to the predetermined program.

[0025] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the utility model.

Claims

1. A general fixture for milling fir-tree blade root of a turbine governing stage blade, comprising four supports (1), each of which is connected with a guide frame (2) at the top and forms two groups of stands, each group of stands comprising two supports (1) and two guide frames (2), characterized in that: The mounting plate (10) is symmetrically arranged between the two groups of stands, parallel electric sliding rails (11) are arranged on the mounting plate (10), a moving frame (12) is slidably connected to the electric sliding rails (11), support rods (13) are slidably connected to the moving frame (12) in parallel, arc-shaped clamping plates (15) are connected to the ends of the support rods (13) away from the moving frame (12), and the arc-shaped clamping plates (15) are used for abutting and matching with fir-tree type blade roots of the turbine governing stage moving blades.

2. A general purpose fixture for milling fir tree blade root of a control stage blade of a steam turbine as claimed in claim 1, characterized in that: A second threaded rod (14) is rotatably connected to the moving frame (12), the second threaded rod (14) is connected with a second motor (141) arranged on the moving frame (12), the second threaded rod (14) is threaded through the support rod (13), and the second threaded rod (14) rotationally drives the support rod (13) to move horizontally along the moving frame (12).

3. A general purpose fixture for milling the fir tree blade root of a turbine governing stage blade as defined in claim 2, characterized in that: The first n-shaped frame (3) is slidably connected between the two guide frames (2) of each group of stands, the second n-shaped frame (31) is connected between the first n-shaped frames (3) on the two stands, the lower ends of the second n-shaped frame (31) are connected with connecting plates (6), the electric push rods (9) are arranged on the connecting plates (6), the movable ends of the electric push rods (9) are connected with bidirectional screw rods (7), the bidirectional screw rods (7) slide through the vertical plates at the bottoms of the connecting plates (6), the hooks (8) are threadedly connected to the two threaded grooves of the bidirectional screw rods (7), the hooks (8) are rotationally connected with the vertical plates at the bottoms of the connecting plates (6), and the hooks (8) are used for hooking the turbine governing stage moving blades.

4. A general purpose fixture for milling the fir tree blade root of a turbine governing stage blade as defined in claim 3, characterized in that: The arc-shaped fixing plates (16) are arranged on the longitudinal outer walls of the second n-shaped frame (31), the lower ends of the arc-shaped fixing plates (16) are provided with sleeves (161), the sleeves (161) are slidably connected with moving rods (17), the elastic elements (18) are arranged between the ends of the moving rods (17) in the inner cavities of the sleeves (161) and the inner walls of the sleeves (161), and the ends of the moving rods (17) away from the sleeves (161) are used for abutting against the turbine governing stage moving blades.

5. A general purpose fixture for milling the fir tree blade root of a turbine governing stage blade as defined in claim 4 wherein: The ends of the moving rods (17) away from the sleeves (161) are provided with friction blocks (19).

6. A general purpose fixture for milling the fir tree blade root of a turbine governing stage blade as defined in claim 5 wherein: The first motor (4) is arranged on at least one support frame (1) of each group of stands, the first threaded rod (5) is connected to the output shaft of the first motor (4), the first threaded rod (5) is parallel to the guide frame (2), and the first threaded rod (5) is threaded through the first n-shaped frame (3).

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