A half key dismounting tool for a guide vane crank arm of a small and medium-sized Francis turbine unit

Abstract

This utility model provides a disassembly fixture for the split key of the guide vane crank arm in small and medium-sized mixed-flow turbine units. It includes a support frame with movable clamping seats on both sides. A fixed outer cylinder is located above the support frame, and a rotatable inner cylinder is located inside the fixed outer cylinder. The rotatable inner cylinder is threadedly connected to the fixed outer cylinder. A through hole is located at the center of the rotatable inner cylinder, and a threaded rod is coaxially arranged inside the through hole. A detachable limiting pin is also provided between the clamping seats and the support frame. This disassembly fixture, through the detachable connection between the clamping seats and the support frame and the fixing of the limiting pin, combined with the threaded transmission structure of the rotatable inner cylinder and the threaded rod, can accurately position and pull the split key. This solves the problem of traditional jacks requiring welding in narrow spaces to pull out the split key, and eliminates the need for complex welding operations, simplifying the disassembly process, improving operational safety and efficiency. The detachable structure also facilitates installation and debugging.

Description

Technical Field

[0001] This utility model relates to the field of split-key disassembly, and in particular to a tooling for disassembling the split-key of the guide vane crank arm of a small-to-medium-sized mixed-flow turbine unit. Background Technology

[0002] In the disassembly of the guide vane crank arm split key (hereinafter referred to as the split key) of small and medium-sized mixed-flow turbine units, the traditional method relies on welding T-shaped steel to the split key. A jack is placed on each side below the T-shaped steel, and the split key is pulled out by pressing down on the jacks. This method is not only time-consuming and labor-intensive, but also requires two people to work together, making it difficult to ensure even force application. This leads to the T-shaped steel and the split key being prone to breakage at the weld, requiring repeated welding. This increases the operational difficulty and the risk of failure.

[0003] In addition, the waterwheel room is relatively narrow and poorly ventilated, and the welding fumes pose a significant safety hazard to personnel. Therefore, the traditional method of disassembling the split key has significant shortcomings in terms of operational complexity, safety, and efficiency, and these problems need to be solved by improving the tooling design and operating procedures. Utility Model Content

[0004] The main purpose of this utility model is to provide a tooling for disassembling the split key of the guide vane crank arm in small and medium-sized mixed-flow units, which solves the problem that welding is required in a narrow space when using the traditional method of pulling out the split key with a jack.

[0005] To solve the above technical problems, the technical solution adopted by this utility model is: a tooling for disassembling the guide vane crank arm of a small and medium-sized mixed flow unit, including a support frame, movable clamping seats on both sides of the support frame, a fixed outer cylinder above the support frame, a rotatable rotating inner cylinder inside the fixed outer cylinder, and a threaded connection between the rotating inner cylinder and the fixed outer cylinder.

[0006] The rotating inner cylinder has a through hole at its center, and a threaded rod is coaxially arranged inside the through hole. A detachable limit pin is also provided between the clamping seat and the support frame.

[0007] In the preferred embodiment, the clamping seat includes a flat plate, one side of which is provided with a vertical plate perpendicular to it, and the top side of the vertical plate is provided with a positioning plate, which is used to be positioned on the edge of the crank arm.

[0008] The plate also has multiple first elongated holes, which are used to connect the support frame.

[0009] In the preferred embodiment, the support frame includes a lifting plate, which has multiple second elongated holes. Tensioning bolts are installed in the second elongated holes and are threaded through the lifting plate and connected to the clamping seat.

[0010] In the preferred embodiment, limiting plates are provided on both sides of the second elongated hole, and the limiting plates are arranged below the lifting plate;

[0011] The positions of the limiting plate and the first long hole correspond one-to-one.

[0012] In the preferred embodiment, the top of the limiting plate is provided with a connecting bolt that is threadedly connected to the lifting plate, and multiple evenly distributed slots are symmetrically provided on both sides of the limiting plate. The slots are used to install the limiting pins.

[0013] In the preferred embodiment, the limiting plates are symmetrically arranged on both sides of the fixed outer cylinder.

[0014] In the preferred embodiment, the top two sides of the rotating inner cylinder are provided with connecting seats, the connecting seats are provided with connecting holes, and the connecting holes are provided with detachable handrails, which facilitate the operator to rotate the rotating inner cylinder.

[0015] In the preferred embodiment, the top of the rotating inner cylinder is also provided with a rotating groove, and a rotating disk is provided in the rotating groove. The center of the rotating disk is provided with a through hole arranged coaxially with the through hole.

[0016] The rotating disk is rotatably connected to the rotating groove.

[0017] In the preferred embodiment, the diameters of the through holes and through holes are greater than the maximum outer diameter of the threaded rod.

[0018] In the preferred embodiment, the threaded rod is also provided with a lifting plate, which is threadedly connected to the threaded rod, and the lifting plate is in contact with the rotating disk;

[0019] The outer diameter of the lifting plate is smaller than that of the rotating disk, and the threaded rod is used to connect with the traction hole on the split key.

[0020] This utility model provides a disassembly fixture for the split key of the guide vane crank arm in small and medium-sized mixed-flow turbine units, which has the following advantages: This disassembly fixture, through the detachable connection between the clamping seat and the support frame and the fixing of the limiting pin, combined with the threaded transmission structure of the rotating inner cylinder and the threaded rod, can accurately position and pull the split key, solving the problem that the traditional jack needs to be welded in a narrow space to pull out the split key, and eliminating the need for complicated welding operations, simplifying the disassembly process, improving the safety and efficiency of the operation, and the detachable structure facilitates installation and debugging. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0022] Figure 1 This is an isometric view of the disassembly fixture of this utility model;

[0023] Figure 2 This is an axial side view of the split key of this utility model;

[0024] Figure 3This is an isometric view of the limiting plate of this utility model;

[0025] Figure 4 This is an isometric view of the first-stage disassembly of the disassembly fixture of this utility model;

[0026] Figure 5 This is a cross-sectional schematic diagram of the first-stage disassembly of the disassembly tooling of this utility model;

[0027] Figure 6 This is a partial sectional view of the threaded rod of this utility model;

[0028] Figure 7 This is an isometric view of the two-stage disassembly process of the disassembly fixture of this utility model;

[0029] Figure 8 This is a cross-sectional view of the two-stage disassembly process of the disassembly fixture of this utility model.

[0030] In the diagram: Clamping seat 1; Flat plate 101; Vertical plate 102; Positioning plate 103; First elongated hole 104; Support frame 2; Lifting plate 201; Second elongated hole 202; Tensioning bolt 203; Connecting bolt 204; Limiting plate 205; Slot 206; Fixed outer cylinder 207; Rotating inner cylinder 3; Connecting seat 301; Connecting hole 302; Through hole 303; Rotating groove 304; Rotating disk 305; Handrail 4; Threaded rod 5; Lifting plate 501; Crank arm 6; Split key 7; Traction hole 701; Limiting pin 8. Detailed Implementation

[0031] Example 1

[0032] like Figure 1-8 As shown, a tooling for disassembling the guide vane crank arm of a small-to-medium-sized mixed-flow turbine includes a support frame 2, movable clamping seats 1 on both sides of the support frame 2, a fixed outer cylinder 207 on the top of the support frame 2, and a rotatable rotating inner cylinder 3 inside the fixed outer cylinder 207. The rotating inner cylinder 3 is threadedly connected to the fixed outer cylinder 207.

[0033] The rotating inner cylinder 3 has a through hole 303 at its center, and a threaded rod 5 is coaxially arranged inside the through hole 303. A detachable limiting pin 8 is also provided between the clamping seat 1 and the support frame 2.

[0034] In the preferred embodiment, the clamping seat 1 includes a flat plate 101, a vertical plate 102 perpendicular to the flat plate 101 on one side, and a positioning plate 103 on the top side of the vertical plate 102. The positioning plate 103 is used to be placed on the edge of the crank arm 6.

[0035] The plate 101 is also provided with a plurality of first elongated holes 104, which are used to connect the support frame 2.

[0036] In the preferred embodiment, the support frame 2 includes a lifting plate 201, which has a plurality of second elongated holes 202. A tension bolt 203 is provided in the second elongated holes 202, and the tension bolt 203 passes through the lifting plate 201 and is threadedly connected to the clamping seat 1.

[0037] In the preferred embodiment, limiting plates 205 are provided on both sides of the second elongated hole 202, and the limiting plates 205 are arranged below the lifting plate 201.

[0038] The positions of the limiting plate 205 and the first elongated hole 104 correspond one-to-one.

[0039] In the preferred embodiment, the top of the limiting plate 205 is provided with a connecting bolt 204 that is threadedly connected to the lifting plate 201, and multiple evenly distributed slots 206 are symmetrically provided on both sides of the limiting plate 205. The slots 206 are used to install the limiting pins 8.

[0040] In the preferred embodiment, the limiting plates 205 are symmetrically arranged on both sides of the fixed outer cylinder 207.

[0041] In the preferred embodiment, the top two sides of the rotating inner cylinder 3 are provided with connecting seats 301, the connecting seats 301 are provided with connecting holes 302, and the connecting holes 302 are provided with detachable handrails 4, which facilitate the operator to rotate the rotating inner cylinder 3.

[0042] In the preferred embodiment, the top of the rotating inner cylinder 3 is also provided with a rotating groove 304, and a rotating disk 305 is provided in the rotating groove 304. The center of the rotating disk 305 is provided with a through hole arranged coaxially with the through hole 303.

[0043] The rotating disk 305 is rotatably connected to the rotating groove 304.

[0044] In the preferred embodiment, the diameters of the through hole 303 and the through hole are greater than the maximum outer diameter of the threaded rod 5.

[0045] In the preferred embodiment, the threaded rod 5 is also provided with a lifting plate 501, which is threadedly connected to the threaded rod 5, and the lifting plate 501 is in contact with the rotating disk 305;

[0046] The outer diameter of the lifting plate 501 is smaller than the outer diameter of the rotating disk 305, and the threaded rod 5 is used to connect with the traction hole 701 on the split key 7.

[0047] The specific implementation method of a disassembly fixture for the guide vane crank arm split key of a small and medium-sized mixed flow unit is as follows: First, the positioning plate 103 of the clamping seat 1 is placed on the edge of the crank arm 6. The tension bolt 203 passes through the second long hole 202 of the lifting plate 201 and is threadedly connected to the first long hole 104 of the clamping seat 1 to fix the fixture. Then, the threaded rod 5 is connected to the traction hole 701 on the split key 7.

[0048] Next, the operator holds the handle 4 and rotates the inner cylinder 3. Since the inner cylinder 3 is threadedly connected to the outer cylinder 207, it will move upward when rotated, and then pull up the split key 7 through the threaded rod 5. When the split key 7 is pulled to the maximum limit, the lifting plate 501 is rotated upward to disengage it from the rotating disk 305, leaving room for the overall height of the tooling to be raised.

[0049] Then, lift the limit plate 205 and insert the limit pin 8 into the slot 206 to increase the overall height. Continue to rotate the inner cylinder 3 and pull out the split key 7 a second time. Repeat this operation until the split key 7 is completely pulled out. The whole process is simple to operate, does not require welding in a narrow space, and can stably and efficiently complete the disassembly of the split key.

[0050] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A tooling for disassembling the guide vane crank arm split key of a small-to-medium-sized mixed-flow turbine unit, characterized in that: Includes a support frame (2), with movable clamping seats (1) on both sides of the support frame (2), and a fixed outer cylinder (207) on the top of the support frame (2). The fixed outer cylinder (207) has a rotatable rotating inner cylinder (3) inside, and the rotating inner cylinder (3) is threadedly connected to the fixed outer cylinder (207). The rotating inner cylinder (3) has a through hole (303) at its center. A threaded rod (5) is coaxially arranged inside the through hole (303). A detachable limit pin (8) is also provided between the clamping seat (1) and the support frame (2).

2. The guide vane crank arm half key dismounting tool for a small and medium-sized Francis turbine unit according to claim 1, characterized in that: The clamping seat (1) includes a flat plate (101), a vertical plate (102) perpendicular to the flat plate (101) is provided on one side, and a positioning plate (103) is provided on the top side of the vertical plate (102). The positioning plate (103) is used to be placed on the edge of the crank arm (6). The plate (101) is also provided with a plurality of first elongated holes (104), which are used to connect the support frame (2).

3. The guide vane crank arm half key dismounting tool for a small and medium-sized Francis turbine unit according to claim 1, characterized in that: The support frame (2) includes a lifting plate (201), which has multiple second long holes (202). The second long holes (202) are provided with tension bolts (203), which pass through the lifting plate (201) and are threadedly connected to the clamping seat (1).

4. The guide vane crank arm half key dismounting tool for a small and medium-sized Francis turbine unit according to claim 3, characterized in that: Limiting plates (205) are provided on both sides of the second elongated hole (202), and the limiting plates (205) are arranged below the lifting plate (201); The positions of the limiting plate (205) and the first elongated hole (104) correspond one-to-one.

5. The guide vane crank arm half key dismounting tool for a small and medium-sized Francis turbine unit according to claim 4, characterized in that: The top of the limiting plate (205) is provided with a connecting bolt (204) that is threadedly connected to the lifting plate (201). Multiple evenly distributed slots (206) are symmetrically provided on both sides of the limiting plate (205). The slots (206) are used to install the limiting pins (8).

6. The guide vane crank arm half key dismounting tool for a small and medium-sized Francis turbine unit according to claim 5, characterized in that: Limiting plates (205) are symmetrically arranged on both sides of the fixed outer cylinder (207).

7. The guide vane crank arm half key dismounting tool for a small and medium-sized Francis turbine unit according to claim 1, characterized in that: The top two sides of the rotating inner cylinder (3) are provided with connecting seats (301), and the connecting seats (301) are provided with connecting holes (302). The connecting holes (302) are provided with detachable handrails (4), which facilitate the operator to rotate the rotating inner cylinder (3).

8. The guide vane crank arm half key dismounting tool for a small and medium-sized Francis turbine unit according to claim 7, characterized in that: The top of the rotating inner cylinder (3) is also provided with a rotating groove (304), and a rotating disk (305) is provided in the rotating groove (304). The center of the rotating disk (305) is provided with a through hole arranged coaxially with the through hole (303). The rotating disk (305) is rotatably connected to the rotating groove (304).

9. The guide vane crank arm half key dismounting tool for a small and medium-sized Francis turbine unit according to claim 8, characterized in that: The diameters of the through hole (303) and the through hole are greater than the maximum outer diameter of the threaded rod (5).

10. The guide vane crank arm half key dismounting tool for a small and medium-sized Francis turbine unit according to claim 1, characterized in that: The threaded rod (5) is also provided with a lifting plate (501), which is threadedly connected to the threaded rod (5), and the lifting plate (501) is in contact with the rotating disk (305). The outer diameter of the lifting plate (501) is smaller than the outer diameter of the rotating disk (305), and the threaded rod (5) is used to connect with the traction hole (701) on the split key (7).

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