Special tool for milling back arc of moving blade of steam turbine

Abstract

The invention relates to a special tool for milling a back arc of a moving blade of a steam turbine. The special tool comprises a base, a clamp body and an end face pressing mechanism, a side surface positioning block, a side surface pressing block and an end surface positioning block are arranged on the clamp body; the side face positioning block is installed on the left side of the clamp body through the left-right position adjusting mechanism, the side face pressing block is installed on the right side of the clamp body through the pressing mechanism, and the side face pressing block is used for pressing the moving blade on the side face positioning block from the right side. The end face positioning block is installed on the rear side of the clamp body through the front-back position adjusting mechanism, the end face pressing mechanism is arranged in front of the clamp body, and the end face pressing mechanism is used for pressing the moving blade on the end face positioning block from the front end. By adjusting the positions of the side face positioning blocks and the end face positioning blocks, the machining device can be used for machining milling steam passages of moving blades of steam turbines of different models, the moving blades can be prevented from moving in the machining process, deformation of the moving blades can be avoided, and the machining precision is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of moving blade processing, and in particular to a special tool for milling a back arc of a steam turbine moving blade. Background Art

[0002] At present, there are different processing methods for turbine blade ducts, and the tooling used is also diverse. However, the existing fixtures and tools have poor versatility. Different types of blades need to be replaced with different fixtures for adaptation, which increases the processing cost and time cost, making the processing efficiency low; and due to the poor versatility, the positioning and clamping method between the fixture and the moving blade is not accurate enough, and the blade is prone to offset, affecting the processing accuracy. Summary of the invention

[0003] Based on the above description, the present invention provides a special tooling for milling the back arc of steam turbine moving blades. By adjusting the positions of the side positioning blocks and the end positioning blocks, it can be used for milling steam ducts of different types of steam turbine moving blades. During the machining process, it can prevent the moving blades from being displaced and deformed, thereby ensuring machining accuracy.

[0004] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a special tool for milling the back arc of a turbine moving blade, comprising a base and a clamping body and an end face pressing mechanism arranged on the top of the base; a side positioning block, a side pressing block and an end face positioning block are arranged on the clamping body; the side positioning block is installed on the left side of the clamping body through a left-right position adjustment mechanism, and the side pressing block is installed on the right side of the clamping body through a pressing mechanism, and the side pressing block is used to press the moving blade onto the side positioning block from the right side; the end face positioning block is installed on the rear side of the clamping body through a front-back position adjustment mechanism, and the end face pressing mechanism is arranged in front of the clamping body, and the end face pressing mechanism is used to press the moving blade onto the end face positioning block from the front end.

[0005] Based on the above technical solution, the present invention can also be improved as follows.

[0006] Furthermore, the clamp body includes a left stop block and a right stop block; the left stop block is arranged on the top left side of the clamp body, and the right stop block is arranged on the top right side of the clamp body, and an installation groove is formed between the left stop block and the right stop block; the side positioning block is arranged in the installation groove, and the side positioning block is connected to the left stop block through the left and right position adjustment mechanism.

[0007] Furthermore, the left and right position adjustment mechanism includes a first adjusting bolt and a first elastic member, the first adjusting thread penetrates the left stop block from left to right, and the right end of the first adjusting bolt is threadedly connected to the side positioning block; the first elastic member is arranged between the left stop block and the side positioning block.

[0008] Furthermore, a clamping groove is provided on the left side of the top of the right stopper; the side pressure block is arranged in the clamping groove, and the left side of the side pressure block extends into the installation groove from the left side of the clamping groove; the clamping mechanism includes a stud, a clamping nut and a spring; the bottom end of the stud is connected to the bottom end of the clamping groove, and the top end of the stud is inclined to the right, and the side pressure block can be slidably mounted on the stud; the clamping nut is threadedly matched with the stud, and the clamping nut is against the top end of the side pressure block; the spring is arranged between the bottom of the side pressure block and the bottom of the clamping groove.

[0009] Furthermore, a rear stopper is provided at the rear end of the clamp body, the end surface positioning block is provided in the mounting groove, and the end surface positioning block is installed on the rear stopper via the front-rear position adjustment mechanism.

[0010] Furthermore, the front-to-rear position adjustment mechanism includes a second adjusting bolt and a second elastic member, the second adjusting thread penetrates the rear stop block from back to front, and the front end of the second adjusting bolt is threadedly connected to the end face positioning block; the second elastic member is arranged between the rear stop block and the end face positioning block.

[0011] Furthermore, a replaceable profile pad is provided at the bottom of the mounting groove, and the top shape of the profile pad matches the moving blade.

[0012] Furthermore, the end face clamping mechanism includes a main support seat, a secondary support seat, a hinge pressure plate and an eccentric wheel; the rear end of the hinge pressure plate is used to clamp the front end of the moving blade, the middle part of the hinge pressure plate is hinged to the main support seat, and the bottom of the main support seat is connected to the base; the front end of the hinge pressure plate is hinged to the eccentricity of the eccentric wheel, the secondary support seat is used to support the bottom of the eccentric wheel, and the bottom of the secondary support seat is connected to the base; a first fixing pin hole is also provided on the eccentric wheel, and a second fixing pin hole matching the first fixing pin hole is provided at the front end of the hinge pressure plate, and the first fixing pin hole and the second fixing pin hole can be connected by a fixing pin.

[0013] Furthermore, the auxiliary support seat includes a height-adjustable support bolt, and the bottom of the support bolt is threadedly connected to the base.

[0014] Furthermore, a handle is provided on the front side of the eccentric wheel.

[0015] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0016] The present invention can be used for milling steam passages of turbine moving blades of different types by adjusting the positions of the side positioning blocks and the end surface positioning blocks. During the processing, displacement of the moving blades can be prevented, deformation of the moving blades can be avoided, and processing accuracy can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of a special tool for milling the back arc of a turbine rotor blade provided by an embodiment of the present invention;

[0018] Figure 2 for Figure 1 Schematic diagram of the use state of the middle hinge pressure plate when releasing the moving blade;

[0019] Figure 3 for Figure 1 A partial cross-sectional view from above;

[0020] Figure 4 for Figure 1 a sectional view of the front view;

[0021] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0022] 1. Base; 2. Clamp body; 21. Left stopper; 22. Mounting groove; 23. Right stopper; 24. Clamping groove; 3. Side positioning block; 31. First adjusting bolt; 32. First elastic member; 4. Side pressure block; 41. Stud; 42. Clamping nut; 43. Spring; 5. Rear stopper; 6. End face clamping mechanism; 61. Second adjusting bolt; 62. Second elastic member; 7. End face clamping mechanism; 71. Main support seat; 72. Second support seat; 73. Hinge pressure plate; 74. Eccentric wheel; 75. Handle; 76. First fixing pin hole; 77. Second fixing pin hole; 78. Fixing pin; 8. Profile pad; 9. Moving blade. DETAILED DESCRIPTION

[0023] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0025] It will be appreciated that spatial relationship terms such as "under," "beneath," "below," "under," "above," "above," etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It will be appreciated that, in addition to the orientations shown in the figures, spatial relationship terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as being "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0026] A special tool for milling the back arc of a turbine moving blade 9 includes a base 1, a clamp body 2, and an end face clamping mechanism 76. The clamp body 2 is fixed to the top of the base 1 by bolts, and a side positioning block 3, a side pressing block 4, and an end face positioning block are provided on the clamp body 2. The side positioning block 3 is installed on the left side of the clamp body 2 through a left-right position adjustment mechanism, and the side pressing block 4 is installed on the right side of the clamp body 2 through a clamping mechanism. The side pressing block 4 is used to press the moving blade 9 onto the side positioning block 3 from the right side. The end face positioning block is installed on the rear side of the clamp body 2 through a front-back position adjustment mechanism, and the end face clamping mechanism 76 is provided in front of the clamp body 2. The end face clamping mechanism 76 is used to press the moving blade 9 onto the end face positioning block from the front end.

[0027] This embodiment can be used for milling steam passages of turbine moving blades 9 of different types by adjusting the positions of the side positioning blocks 3 and the end positioning blocks. During the machining process, displacement of the moving blades 9 can be prevented, and deformation of the moving blades 9 can be avoided, thereby ensuring machining accuracy.

[0028] Specifically, the clamp body 2 includes a left stopper 21 and a right stopper 23. The left stopper 21 is arranged on the top left side of the clamp body 2, and the right stopper 23 is arranged on the top right side of the clamp body 2, and a mounting groove 22 is formed between the left stopper 21 and the right stopper 23.

[0029] The side positioning block 3 is arranged in the mounting groove 22, and the left-right position adjustment mechanism includes a first adjustment bolt 31 and a first elastic member 32. The first adjustment thread penetrates the left stopper 21 from left to right, and the right end of the first adjustment bolt 31 is threadedly connected to the side positioning block 3. The first elastic member 32 is arranged between the left stopper 21 and the side positioning block 3. By tightening or loosening the first adjustment bolt 31, the left-right position of the side positioning block 3 can be adjusted, thereby adjusting the distance between the side positioning block 3 and the side pressure plate, so as to adapt to the moving blades 9 of different widths.

[0030] A clamping groove 24 is provided on the left side of the top of the right stopper 23. The side clamping block 4 is provided in the clamping groove 24, and the left side of the side clamping block 4 extends from the left side of the clamping groove 24 into the mounting groove 22. The clamping mechanism includes a stud 41, a clamping nut 42 and a spring 43. The bottom end of the stud 41 is connected to the bottom end of the clamping groove 24, and the top end of the stud 41 is inclined to the right, and the side clamping block 4 is slidably mounted on the stud 41. The clamping nut 42 is threadedly matched with the stud 41, and the clamping nut 42 abuts against the top end of the side clamping block 4. The spring 43 is provided between the bottom of the side clamping block 4 and the bottom of the clamping groove 24.

[0031] The rear end of the clamp body 2 is fixed with a rear block 5 by bolts, the end face positioning block is arranged in the mounting groove 22, and the front and rear position adjustment mechanism includes a second adjustment bolt 61 and a second elastic member 62, the second adjustment thread penetrates the rear block 5 from the back to the front, and the front end of the second adjustment bolt 61 is threadedly connected with the end face positioning block. The second elastic member 62 is arranged between the rear block 5 and the end face positioning block. By tightening or loosening the second adjustment bolt 61, the front and rear position of the end face positioning block can be adjusted, thereby adjusting the distance between the end face positioning block and the end face clamping mechanism 76, which is used to adapt to moving blades 9 of different lengths.

[0032] A replaceable profile pad 8 is provided at the bottom of the mounting groove 22 . The top shape of the profile pad 8 matches the moving blade 9 , so as to adapt to moving blades 9 of different shapes.

[0033] The end face clamping mechanism 76 includes a main support seat 71, a secondary support seat 72, a hinge pressure plate 73 and an eccentric wheel 74. The rear end of the hinge pressure plate 73 is used to clamp the front end of the moving blade 9, the middle part of the hinge pressure plate 73 is hinged to the main support seat 71, and the bottom of the main support seat 71 is connected to the base 1. The front end of the hinge pressure plate 73 is hinged to the eccentric part of the eccentric wheel 74, the secondary support seat 72 is used to support the bottom of the eccentric wheel 74, and the bottom of the secondary support seat 72 is connected to the base 1. The eccentric wheel 74 is also provided with a first fixing pin hole 76, and the front end of the hinge pressure plate 73 is provided with a second fixing pin hole 77 matching the first fixing pin hole 76, and the first fixing pin hole 76 and the second fixing pin hole 77 can be connected by a fixing pin 78.

[0034] A handle 75 is provided on the front side of the eccentric wheel 74. Figure 1 and Figure 2 As shown, when the handle 75 is pulled downward to make the connection between the eccentric wheel 74 and the hinge pressing plate 73 at a low point, the hinge pressing plate 73 releases the moving blade 9. When the handle 75 is pulled upward to make the connection between the eccentric wheel 74 and the hinge pressing plate 73 at a high point, the hinge pressing plate 73 presses the moving blade 9.

[0035] In this embodiment, the auxiliary support seat 72 includes a height-adjustable support bolt, the bottom of which is threadedly connected to the base 1. By adjusting the height of the auxiliary support seat 72, the distance of the rear end of the hinge pressing plate 73 extending when the moving blade 9 is pressed can be adjusted.

[0036] The method of using the special tool for milling the back arc of the turbine rotor blade 9 of this embodiment is as follows:

[0037] First, fix the end face positioning block and the side positioning block 3 to the rear end and the left side of the clamp body 2 respectively and adjust the position, then install the profile pad 8 in the installation groove 22, and the rear end of the profile pad 8 is close to the end face positioning block, and the left side is close to the side positioning block 3. At this time, place the moving blade 9 on the profile pad 8, fix the side pressure block 4 on the clamp body 2 with the stud 41, and tighten the compression nut 42 to press the left and right sides of the moving blade 9. Finally, drive the hinge pressure plate 73 to press the moving blade 9 in the front and back directions through the handle and the eccentric wheel 74, and fix the hinge pressure plate 73 and the eccentric wheel 74 with the fixing pin 78, and then the blade can be milled to length.

[0038] This embodiment improves the processing quality and production efficiency of turbine blades, meets the needs of modern industry for high-efficiency and high-precision processing, can reduce production costs, and improve the economic benefits and market competitiveness of enterprises. It also has a reliable structure, and the processed parts are of high precision and a high pass rate, so that multiple models can be widely used and costs are saved.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A special tool for milling the back arc of a turbine rotor blade, characterized in that: It includes a base and a clamping body and an end face pressing mechanism arranged on the top of the base; a side positioning block, a side pressing block and an end face positioning block are arranged on the clamping body; the side positioning block is installed on the left side of the clamping body through a left-right position adjustment mechanism, and the side pressing block is installed on the right side of the clamping body through a pressing mechanism, and the side pressing block is used to press the moving blades onto the side positioning block from the right side; the end face positioning block is installed on the rear side of the clamping body through a front-back position adjustment mechanism, and the end face pressing mechanism is arranged in front of the clamping body, and the end face pressing mechanism is used to press the moving blades onto the end face positioning block from the front end.

2. The special tool for milling the back arc of a turbine rotor blade according to claim 1, characterized in that: The clamp body includes a left stopper and a right stopper; the left stopper is arranged on the top left side of the clamp body, and the right stopper is arranged on the top right side of the clamp body, and a mounting groove is formed between the left stopper and the right stopper; the side positioning block is arranged in the mounting groove, and the side positioning block is connected to the left stopper through the left and right position adjustment mechanism.

3. The special tool for milling the back arc of turbine rotor blades according to claim 2, characterized in that: The left-right position adjustment mechanism includes a first adjustment bolt and a first elastic member, the first adjustment thread penetrates the left stopper from left to right, and the right end of the first adjustment bolt is threadedly connected to the side positioning block; the first elastic member is arranged between the left stopper and the side positioning block.

4. The special tool for milling the back arc of a turbine rotor blade according to claim 2, characterized in that: A clamping groove is provided on the left side of the top of the right stopper; the side pressure block is arranged in the clamping groove, and the left side of the side pressure block extends into the installation groove from the left side of the clamping groove; the clamping mechanism includes a stud, a clamping nut and a spring; the bottom end of the stud is connected to the bottom end of the clamping groove, and the top end of the stud is inclined to the right, and the side pressure block is slidably mounted on the stud; the clamping nut is threadedly matched with the stud, and the clamping nut is against the top end of the side pressure block; the spring is arranged between the bottom of the side pressure block and the bottom of the clamping groove.

5. The special tool for milling the back arc of turbine rotor blades according to claim 2, characterized in that: A rear stopper is arranged at the rear end of the clamp body, the end surface positioning block is arranged in the mounting groove, and the end surface positioning block is installed on the rear stopper through the front and rear position adjustment mechanism.

6. The special tool for milling the back arc of a turbine rotor blade according to claim 5, characterized in that: The front-to-rear position adjustment mechanism includes a second adjustment bolt and a second elastic member, the second adjustment thread penetrates the rear stop block from back to front, and the front end of the second adjustment bolt is threadedly connected to the end face positioning block; the second elastic member is arranged between the rear stop block and the end face positioning block.

7. The special tool for milling the back arc of turbine rotor blades according to claim 2, characterized in that: A replaceable profile pad is provided at the bottom of the mounting groove, and the top shape of the profile pad matches the moving blade.

8. The special tool for milling the back arc of a turbine rotor blade according to claim 1, characterized in that: The end face clamping mechanism includes a main support seat, a secondary support seat, a hinge pressure plate and an eccentric wheel; the rear end of the hinge pressure plate is used to clamp the front end of the moving blade, the middle part of the hinge pressure plate is hinged to the main support seat, and the bottom of the main support seat is connected to the base; the front end of the hinge pressure plate is hinged to the eccentricity of the eccentric wheel, the secondary support seat is used to support the bottom of the eccentric wheel, and the bottom of the secondary support seat is connected to the base; a first fixing pin hole is also provided on the eccentric wheel, and a second fixing pin hole matching the first fixing pin hole is provided at the front end of the hinge pressure plate, and the first fixing pin hole and the second fixing pin hole can be connected by a fixing pin.

9. The special tool for milling the back arc of a turbine rotor blade according to claim 8, characterized in that: The auxiliary support seat comprises a height-adjustable support bolt, and the bottom of the support bolt is threadedly connected to the base.

10. The special tool for milling the back arc of a turbine rotor blade according to claim 8, characterized in that: A handle is arranged on the front side of the eccentric wheel.

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