Hand-held milling tool for steam sealing sheet of steam turbine

Abstract

The utility model discloses a hand-held milling tool for a steam sealing sheet of a steam turbine, which comprises a pneumatic gun body, a milling head and a milling head, the steam seal tooth top milling cutter is connected to the driving end of the driving motor; the supporting assembly is arranged on the pneumatic gun body and comprises a clamping part, a pull block located on the clamping part and a supporting block detachably arranged on the pull block; the pull block is provided with a mounting groove for accommodating a steam seal tooth top milling cutter and connecting ends positioned at the two ends of the mounting groove, and the two supporting blocks are respectively positioned at the two connecting ends; the hand-held pneumatic gun is used for driving the special steam sealing tooth top milling cutter to rotate and mill the allowance of the top of the steam sealing piece, and operation is easy.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine technology, specifically to a hand-held milling tool for steam turbine sealing plates. Background Technology

[0002] Steam turbine rotors are equipped with steam seals to prevent or reduce steam leakage from the cylinders. These seals are thin, sharp, and easily deformed. During turbine operation, various factors can cause damage to the seals, requiring repair. After reinstallation, a portion of the seal's top needs to be cut off. Previously, due to the lack of reliable tools on-site, these seals had to be returned to the company's lathes for machining to the correct dimensions, a process that consumed significant manpower, resources, and finances. Therefore, there is an urgent need for a tool that can directly machine steam seals to the correct dimensions on-site. Utility Model Content

[0003] To solve the above technical problems, this utility model provides a hand-held milling tool for steam turbine seal plates.

[0004] The present invention adopts the following technical solution:

[0005] A handheld milling tool for steam turbine seal plates includes: a pneumatic gun body, including a handheld part and a drive motor disposed on the handheld part; a steam seal tooth top milling cutter connected to the drive end of the drive motor; and a support assembly disposed on the pneumatic gun body, including a clamping part, a pull block located on the clamping part, and a support block detachably disposed on the pull block; the pull block is provided with a mounting groove for accommodating the steam seal tooth top milling cutter and connecting ends located at both ends of the mounting groove, and two support blocks are respectively located on the two connecting ends.

[0006] Preferably, the clamping part includes a half support and a rear cover plate, and a receiving space for accommodating the pneumatic gun body is formed between the half support and the rear cover plate. The half support and the rear cover plate are connected by bolts.

[0007] Preferably, the pneumatic gun body is provided with a clamping post, and the half support and the rear cover plate are both provided with semi-cylindrical grooves, with the clamping post located in the accommodating space formed by the two semi-cylindrical grooves.

[0008] Preferably, the half support is provided with a movable groove, the lower end of the pull block is provided with a movable block, the movable block is provided with an adjustment groove, and an adjustment screw is provided below the half support, with one end of the adjustment screw located in the adjustment groove.

[0009] Preferably, a pressure block is provided below the half support, and the adjustment screw is threaded onto the pressure block; the adjustment groove is a T-shaped groove, and the upper end of the adjustment screw is a matching T-shaped head.

[0010] Preferably, a front cover plate is provided on one side of the half support, and the front cover plate covers the moving groove.

[0011] Preferably, the mounting groove has a semi-circular structure.

[0012] Preferably, the connecting end is provided with a limiting through hole, and the lower end of the support block is provided with a positioning foot that matches the limiting through hole.

[0013] Preferably, a limiting bolt is threaded on one side of the limiting through hole, and the limiting bolt abuts against the surface of the positioning foot.

[0014] Preferably, the upper end of the support block is an arc surface or a plane.

[0015] Compared with the prior art, the present invention has the following advantages: The present invention provides a handheld milling tool for steam turbine seal plates, including a pneumatic gun body, a steam seal tooth top milling cutter and a support assembly. In use, the selection of the pull block and support block is determined according to the rotor and the steam seal plate, and the positioning feet of the support block are used to position and support the steam seal plate. The radial position of the steam seal tooth top milling cutter and the top of the steam seal plate is adjusted by the adjustment screw. Then, the lower end of the pneumatic gun is held by hand, the start switch of the pneumatic gun is turned on, the pneumatic gun drives the steam seal tooth top milling cutter to rotate, and the adjustment screw is used to mill the remaining amount on the top of the steam seal plate. The rotor is rotated while milling until all the steam seal plates are milled in place. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a handheld milling tool.

[0017] Figure 2 This is an exploded view of a handheld milling tool.

[0018] Figure 3 This is a partial structural diagram of a handheld milling tool.

[0019] Figure 4 This is a structural diagram of the pull block and the support block.

[0020] In the figure, the pneumatic gun body 1, handheld part 1-1, drive motor 1-2, clamping column 1-3, steam seal tooth top milling cutter 2, pull block 3, mounting groove 3-1, connecting end 3-2, limit through hole 3-2-1, moving block 3-3, adjusting groove 3-4, support block 4, positioning foot 4-1, half support 5, moving groove 5-1, rear cover plate 6, lower pressure block 7, front cover plate 8, and adjustment screw 9. Detailed Implementation

[0021] To facilitate understanding of the technical solution of this utility model, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments.

[0022] Example 1

[0023] like Figure 1-2 As shown, a handheld milling tool for steam turbine seal plates includes:

[0024] The pneumatic gun body 1 includes a handheld part 1-1 and a drive motor 1-2 disposed on the handheld part 1-1;

[0025] The steam seal toothed end mill 2 is connected to the drive end of the drive motor 1-2. The steam seal toothed end mill 2 is designed with eight teeth, made of W18CrV high-speed tool steel, and solution treated to achieve a hardness of HRC62-65. The cutter head width is designed to be 6mm based on the width of the rotor steam seal plate, and the diameter is designed to be 18mm. The rear end of the steam seal toothed end mill 2 is designed with two cylinders of different sizes: one with a length of 15.5mm and a diameter of 6mm, and the other with a length of 2.5mm and a diameter of 5.5mm. These cylinders are used to fit into the front end slot of the pneumatic gun body 1 to fix the steam seal toothed end mill 2 in place.

[0026] The support assembly is mounted on the pneumatic gun body 1 and includes a clamping part, a pull block 3 located on the clamping part, and a support block 4 detachably mounted on the pull block 3. The pull block 3 and the support block 4 can be matched and replaced with different specifications according to the characteristics of the rotor steam seal plate and the size of the rotor outer circle.

[0027] The pull block 3 is provided with a mounting groove 3-1 for accommodating the steam seal tooth top milling cutter 2 and a connecting end 3-2 located at both ends of the mounting groove 3-1. Two support blocks 4 are respectively located on the two connecting ends 3-2.

[0028] By combining the pneumatic gun body 1 with the support assembly, the milling tool is miniaturized and portable. The detachable structure of the support assembly allows the tool to adapt to the processing needs of gas seal plates of different sizes. Furthermore, the combined structure of the pull block 3 and the support block 4 provides stable support.

[0029] The clamping part includes a half support 5 and a rear cover plate 6. The half support 5 and the rear cover plate 6 form a receiving space to accommodate the pneumatic gun body 1. The half support 5 and the rear cover plate 6 are connected by bolts. The modular design of the clamping part, through the split half support 5 and the rear cover plate 6, significantly improves the tool assembly efficiency. The bolt connection method ensures structural rigidity and facilitates maintenance and repair. The split design allows the tool to adapt to the installation requirements of different models of pneumatic gun bodies, improving versatility.

[0030] The pneumatic gun body 1 is equipped with clamping posts 1-3, and the semi-cylindrical grooves are provided on the half-support 5 and the rear cover plate 6. The clamping posts 1-3 are located within the receiving space formed by the two semi-cylindrical grooves. The cooperation between the semi-cylindrical grooves and the clamping posts 1-3 forms a positioning structure, effectively eliminating vibration displacement during tool operation. The cylindrical surface contact design can automatically compensate for assembly tolerances, ensure the coaxiality of power transmission, and improve the quality of milled surfaces.

[0031] like Figure 3-4As shown, the half support 5 is provided with a moving groove 5-1, the lower end of the pull block 3 is provided with a moving block 3-3, the moving block 3-3 is provided with an adjusting groove 3-4, and the half support 5 is provided with an adjusting screw 9, one end of which is located in the adjusting groove 3-4; the cooperation of the moving groove 5-1 and the adjusting groove 3-4 forms a two-dimensional adjustable mechanism, allowing the operator to accurately adjust the position of the support block 4 through the adjusting screw 9 to meet the processing requirements of different tooth profile parameters.

[0032] The lower part of the half support 5 is provided with a pressure block 7, and the adjustment screw 9 is threadedly engaged with the pressure block 7; the adjustment groove 3-4 is a T-shaped groove, and the upper end of the adjustment screw 9 is a matching T-shaped head; the constraint fit design of the T-shaped groove and the adjustment screw 9 can effectively suppress the loosening of the thread pair caused by high frequency vibration and ensure the stability of the processing parameters.

[0033] The semi-support 5 is provided with a front cover plate 8 on one side, which covers the moving groove 5-1. The protective design of the front cover plate 8 enables the moving groove 5-1 to achieve a dustproof rating of IP54, which is particularly suitable for oily environments at turbine processing or maintenance sites.

[0034] The mounting groove 3-1 has a semi-circular structure, which facilitates the accommodation of the steam seal tooth top milling cutter 2, and the upper end of the steam seal tooth top milling cutter 2 extends beyond the mounting groove 3-1.

[0035] The connecting end 3-2 is provided with a limiting through hole 3-2-1, and the lower end of the support block 4 is provided with a positioning foot 4-1 that matches the limiting through hole 3-2-1; the insertion and cooperation between the positioning foot 4-1 and the limiting through hole 3-2-1 enables quick positioning and installation, which is suitable for the needs of quick switching between multiple working conditions on site.

[0036] The limiting through hole 3-2-1 is threaded on one side with a limiting bolt, which abuts against the surface of the positioning foot 4-1. The upper end of the support block 4 is an arc surface or a flat surface, which facilitates the support block 4 abutting against the surface of the steam seal plate.

[0037] During installation, the above structure is first screwed into the lower pressure block 7 to form the adjustment assembly. Then, the pull block 3 is inserted into the moving slot 5-1 of the half support 5, and the T-shaped head at the upper end of the adjustment screw is placed into the T-shaped slot at the bottom of the pull block 3.

[0038] The front cover plate 8 is fixed to the half support 5 with four hexagon socket head cap screws to block the pull block 3. The lower pressure block 7 is fixed to the half support 5 with two hexagon socket head cap screws. The support block 4 is inserted into the connecting ends 3-2 on the left and right sides of the upper end of the pull block 3 and fixed with two limit bolts. The steam seal toothed end mill 2 is installed into the front end of the pneumatic gun body 1. The height is determined by adjusting the relative position of the positioning feet of the steam seal toothed end mill 2 and the support block 4. Then, the rear cover plate 6 is fixed to the half support 5 with four hexagon socket head cap screws to fix the pneumatic gun body 1. The support block 4 and the pull block 3 can be replaced according to the outer diameter of the rotor and the outer diameter and height of the steam seal plate. When using the equipment, determine the selection of pull block 3 and support block 4 according to the rotor and steam seal plate, and use the positioning feet of the support block to position and support the steam seal plate. Adjust the radial position of the steam seal tooth top milling cutter and the top of the steam seal plate by adjusting the stroke screw 9. Then, hold the lower end of the pneumatic gun by hand and turn on the start switch of the pneumatic gun. The pneumatic gun body 1 drives the steam seal tooth top milling cutter 2 to rotate. With the help of adjusting the stroke screw 9, the remaining material on the top of the steam seal plate is milled. While milling, rotate the rotor until all the steam seal plates are milled in place.

[0039] The above are merely preferred embodiments of this utility model. The scope of protection of this utility model is defined by the scope of the claims. Any improvements and modifications made by those skilled in the art without departing from the spirit and scope of this utility model should also be considered as protection within the scope of this utility model.

Claims

1. A hand-held milling tool for turbine gland plate, characterized in that, The utility model relates to a wind gun body (1) including handheld part (1-1) and drive motor (1-2) set up on handheld part (1-1), steam seal tooth top milling cutter (2) is connected on the drive end of drive motor (1-2), support subassembly is set up on wind gun body (1) and includes clamping part, pull block (3) on clamping part and support block (4) can be detachably set up on pull block (3). The pull block (3) is equipped with the installation groove (3-1) of accommodating steam seal tooth top milling cutter (2) and the connecting end (3-2) at the both ends of installation groove (3-1), and two support blocks (4) are located on two connecting ends (3-2) respectively. The clamping part includes half support (5) and back cover plate (6), and the accommodation space of accommodating wind gun body (1) is formed between half support (5) and back cover plate (6), and half support (5) and back cover plate (6) are connected by bolt. The wind gun body (1) is equipped with clamping column (1-3), and half support (5) and back cover plate (6) are all equipped with semicylindrical groove, and clamping column (1-3) is located in the accommodation space formed by two semicylindrical grooves. The half support (5) is equipped with moving groove (5-1), the lower end of pull block (3) is equipped with moving block (3-3), the moving block (3-3) is equipped with adjusting groove (3-4), the half support (5) is equipped with adjusting screw (9) below, and one end of adjusting screw (9) is located in adjusting groove (3-4).

2. The steam turbine gland plate hand milling tool of claim 1, wherein, The half support (5) is equipped with lower pressing block (7) below, and adjusting screw (9) is threadedly connected on lower pressing block (7); adjusting groove (3-4) is T-shaped groove, and the upper end of adjusting screw (9) is matched T-shaped head.

3. The steam turbine gland plate hand milling tool of claim 2, wherein, One side of the half support (5) is equipped with front cover plate (8), and the front cover plate (8) covers on moving groove (5-1).

4. The steam turbine gland plate hand milling tool of claim 2, wherein, The installation groove (3-1) is semicircular structure.

5. The steam turbine gland plate hand milling tool of claim 4, wherein, The connecting end (3-2) is equipped with limiting through hole (3-2-1), and the lower end of support block (4) is equipped with positioning foot (4-1) matched with limiting through hole (3-2-1).

6. The steam turbine gland plate hand milling tool of claim 4, wherein, One side of the limiting through hole (3-2-1) is threadedly connected with limiting bolt, and the limiting bolt is resisted on the surface of positioning foot (4-1).

7. The steam turbine gland plate hand milling tool of claim 1, wherein, The upper end of the support block (4) is arc surface or plane.

8. The steam turbine gland plate hand milling tool of claim 1, wherein, ​ 9. The steam turbine gland plate hand milling tool of claim 8, wherein, ​ 10. The steam turbine gland plate hand milling tool of claim 1, wherein, ​

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