A special tool for pulling out the lower shaft sleeve of a guide vane of a water turbine

Abstract

The utility model provides a special tool is pulled out to water turbine guide vane lower axle sleeve, relates to water turbine maintenance field, the special tool is pulled out to water turbine guide vane lower axle sleeve, a special tool is pulled out to water turbine guide vane lower axle sleeve, including the hard quality of the diameter less than the axle sleeve diameter and draw body, the draw body outer circle is provided with the draw hook, and the draw hook downward extension device forms the space of accommodating the ejection mechanism, and the bottom of draw hook is located below lower axle sleeve, ejection mechanism sets up below draw body, and the bottom outer circle of draw hook is provided with the convex that extends outward. The special tool is pulled out to water turbine guide vane lower axle sleeve, and the draw hook can be slid outward as a whole through the spiral cone body moves downward, and thus the convex of lower end can move to the gap at the lower end of lower axle sleeve, and the external force is applied to draw body through the setting ejection mechanism, to be able to drive lower axle sleeve and move together with the convex, to be able to pull out lower axle sleeve.

Description

Technical Field

[0001] This utility model relates to the field of water turbine maintenance technology, specifically a special tool for pulling out the lower bushing of the guide vane of a water turbine. Background Technology

[0002] During turbine maintenance, the guide vane lower bushing needs to be replaced to maintain the rotational characteristics of the guide vanes, which is crucial for controlling and maintaining stable unit operation. However, the fit between the guide vane lower bushing and the seat ring is an interference fit, which makes it difficult to remove the lower bushing during maintenance due to long-term operation. The existing method for removing the guide vane lower bushing involves symmetrically welding four cast iron blocks at the same height on the inner wall of the lower bushing. After the blocks cool, a hydraulic jack is used to press a specially designed top plate against the lower end of the blocks, continuously and slowly pushing the lower bushing out. However, the welding position of the blocks is difficult to control precisely, resulting in uneven heights. The top plate cannot be perfectly horizontal, leading to uneven force during removal of the lower bushing, increasing the risk of impact and further complicating removal.

[0003] Existing patent CN2146343Y describes an internal puller, which consists of a lead screw, a support frame mounted on the lead screw via bearings, and a pull claw located at the lower part of the lead screw. Its features include: a support rod fixed to the support frame; the pull claw hinged to a lug via a hinge shaft; the lug being threaded onto the lead screw; a auger at the upper end of the lead screw; and a fixed claw disc at the lower end of the lug. Its advantages are: both the support rod and the pull claw employ a triangular structure, ensuring balance and stability, uniform force distribution, simple structure, reasonable design, ease of use, time and labor saving, no damage to machine parts, and adaptability to disassembly of inner sleeves of different diameters. It also allows for quick disassembly and assembly, facilitating storage and transport, making it particularly suitable for small and medium-sized repair shops. However, the focus of this patent is on adjusting the opening size; the disassembly pull force relies on the outer pull rod, and due to the interference fit of the lower bushing, a small pull force is insufficient for separation. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a special tool for pulling out the lower bushing of a water turbine guide vane, which solves the problem of inconvenient disassembly of the lower bushing mentioned in the background art.

[0005] Technical solution

[0006] To achieve the above objectives, this utility model provides the following technical solution: a special tool for pulling out the lower bushing of a water turbine guide vane. The tool includes a rigid pull body with a diameter smaller than that of the bushing. A hook is provided on the outer ring of the pull body. The hook extends downwards to form a space for accommodating a push-out mechanism. The bottom end of the hook is located below the lower bushing. The push-out mechanism is located below the pull body. An outwardly extending protrusion is provided on the outer ring of the bottom end of the hook. A spiral cone is provided above the pull body to drive the protrusion at the bottom end of the hook outwards to the outer ring of the bushing.

[0007] Furthermore, the hook is hinged to the pull body, with the top of the hook located below the spiral cone, and the spiral cone moves downward to compress the hook to swing.

[0008] Furthermore, the hook and the pull body are slidably connected, and one end of the hook and the pull body that are slidably connected is provided with an inclined surface that is adapted to the spiral cone.

[0009] Furthermore, an internal hex bolt is threaded onto the upper part of the pull body, and the bottom end of the internal hex bolt contacts the pull hook.

[0010] Furthermore, a reset structure for driving the hook to reset is provided on the outer side of the hook.

[0011] Furthermore, the reset structure includes an elastic ring disposed on the outer ring of all hooks after compression and elongation.

[0012] Furthermore, the reset structure includes a reset spring disposed between the hook and the pull body.

[0013] Furthermore, a hook is threadedly connected to the upper part of the pull body.

[0014] Furthermore, a positioning part is provided on the side of the bottom end of the pull body that is in contact with the ejector mechanism, so that the pull body and the ejector mechanism are concentric.

[0015] The beneficial effects of this utility model are as follows:

[0016] 1. The special tool for pulling out the lower bushing of the turbine guide vane uses a spiral cone to move downwards, which can slide the hook outwards as a whole. Therefore, the protrusion at the lower end can be moved to the gap at the lower end of the lower bushing. By setting an ejection mechanism to apply external force to the pull body, the lower bushing and the protrusion can be moved together, thereby pulling out the lower bushing.

[0017] 2. The special tool for pulling out the lower bushing of the turbine guide vane has a positioning part on the side of the bottom of the pull body that is in contact with the ejection mechanism, which makes the pull body and the ejection mechanism concentric. The positioning part can be a slot adapted to the ejection mechanism. By setting the positioning part, the ejection mechanism and the positioning part can be restricted to be concentric, thereby ensuring that the pull body is subjected to uniform force during the ejection process. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of Embodiment 1 of the present utility model;

[0020] Figure 3 This is a schematic diagram of Embodiment 2 of the present invention;

[0021] Figure 4 This is a schematic diagram of the spiral cone of this utility model.

[0022] Among them, 1. Pull body; 2. Pull hook; 3. Ejection mechanism; 4. Protrusion; 5. Spiral cone; 6. Socket head bolt; 7. Reset structure; 71. Elastic ring; 72. Reset spring; 8. Lifting hook; 9. Positioning part. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] See Figures 1-4 A special tool for pulling out the lower bushing of a water turbine guide vane.

[0025] Example 1: A rigid pull body 1 with a diameter smaller than that of the bushing is included. A hook 2 is provided on the outer ring of the pull body 1. The hook 2 extends downward to form a space to accommodate an ejector mechanism 3. The ejector mechanism 3 is a hydraulic jack. The bottom end of the hook 2 is located below the lower bushing. The ejector mechanism 3 is located below the pull body 1. The bottom end of the hook 2 has an outwardly extending protrusion 4. The diameter of the pull body 1 and the hook 2 as a whole is such that the protrusion 4 can slide into the lower bushing. After deformation, the protrusion 4 can be located below the lower bushing. The range of motion of the hook 2 should be greater than the wall thickness of the lower bushing. A spiral cone 5 is provided above the pull body 1 to drive the bottom protrusion 4 of the hook 2 to move outward to the outer ring of the bushing.

[0026] The hook 2 is hinged to the pull body 1, and the top of the hook 2 is located below the spiral cone 5. The spiral cone 5 moves down to squeeze the hook 2 to swing. A reset structure 7 is provided on the outside of the hook 2 to drive the hook 2 to reset.

[0027] The reset structure 7 includes a reset spring 72 positioned between the hook 2 and the pull body 1. In this embodiment, the pull hook 2 can be swung outwards as a whole by moving the spiral cone 5 downwards. Therefore, the protrusion 4 at the lower end can move to the gap at the lower end of the lower bushing. By applying external force to the pull body 1 through the ejection mechanism 3, the lower bushing and protrusion 4 can be moved together, thereby allowing the lower bushing to be pulled out.

[0028] Example 2: A rigid pull body 1 with a diameter smaller than that of the bushing is provided. A hook 2 is provided on the outer ring of the pull body 1. The hook 2 extends downward to form a space to accommodate the ejection mechanism 3. The bottom end of the hook 2 is located below the lower bushing. The ejection mechanism 3 is located below the pull body 1. The bottom end of the hook 2 has an outwardly extending protrusion 4. A spiral cone 5 is provided above the pull body 1 to drive the bottom end protrusion 4 of the hook 2 to move outward to the outer ring of the bushing.

[0029] The hook 2 is slidably connected to the pull body 1. One end of the hook 2 that is slidably connected to the pull body 1 is provided with an inclined surface that is adapted to the spiral cone 5. The hook 2 can be squeezed to move outward by the downward movement of the spiral cone 5.

[0030] The upper part of the pull body 1 is threaded with an internal hex bolt 6. The bottom end of the internal hex bolt 6 contacts the pull hook 2. By setting the internal hex bolt 6, the position of the pull hook 2 after it moves outward can be fixed.

[0031] A reset structure 7 for driving the pull hook 2 to reset is provided on the outside of the pull hook 2.

[0032] The reset structure 7 includes an elastic ring 71 that is compressed and elongated on the outer ring of all hooks 2. The hooks 2 can be reset by deforming the elastic ring 71 as a whole.

[0033] The upper part of the pull body 1 is threaded with a hook 8, which can be used to connect to the overhead crane. With the assistance of the overhead crane, the lower bushing can be pulled out.

[0034] The bottom end of the pull body 1 is provided with a positioning part 9 on the side that is in contact with the ejection mechanism 3, which makes the pull body 1 and the ejection mechanism 3 concentric. The positioning part 9 can be a slot adapted to the ejection mechanism 3. By setting the positioning part 9, the ejection mechanism 3 and the positioning part 9 can be restricted to be concentric, thereby ensuring that the pull body 1 is subjected to uniform force during the ejection process.

[0035] In use, by moving the spiral cone 5 downward, the pull hook 2 can be slid outward as a whole, so that the protrusion 4 at the lower end can be moved to the gap at the lower end of the lower bushing. By setting the ejection mechanism 3 to apply external force to the pull body 1, the lower bushing and the protrusion 4 can be moved together, so that the lower bushing can be pulled out.

[0036] It should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0037] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A special tool for pulling out the lower bushing of a water turbine guide vane, comprising a rigid pulling body (1) with a diameter smaller than that of the bushing, characterized in that: The outer ring of the pull body (1) is provided with a hook (2), and the hook (2) extends downward to form a space to accommodate the ejection mechanism (3). The bottom end of the hook (2) is located below the lower bushing. The ejection mechanism (3) is located below the pull body (1), and the bottom outer ring of the hook (2) is provided with an outwardly extending protrusion (4); The upper part of the pull body (1) is provided with a spiral cone (5) that drives the bottom protrusion (4) of the pull hook (2) to move outward to the outer ring of the bushing.

2. The special tool for pulling out the lower bushing of a water turbine guide vane according to claim 1, characterized in that: The hook (2) is hinged to the pull body (1), and the top of the hook (2) is located below the spiral cone (5). The spiral cone (5) moves down to squeeze the hook (2) to swing.

3. A special tool for pulling out the lower bushing of a water turbine guide vane according to claim 1, characterized in that: The hook (2) is slidably connected to the pull body (1), and one end of the hook (2) that is slidably connected to the pull body (1) is provided with an inclined surface that is adapted to the spiral cone (5).

4. A special tool for pulling out the lower bushing of a water turbine guide vane according to claim 3, characterized in that: The upper part of the pull body (1) is threaded with an internal hex bolt (6), and the bottom end of the internal hex bolt (6) contacts the pull hook (2).

5. A special tool for pulling out the lower bushing of a water turbine guide vane according to any one of claims 2-4, characterized in that: The outside of the hook (2) is provided with a reset structure (7) for driving the hook (2) to reset.

6. A special tool for pulling out the lower bushing of a water turbine guide vane according to claim 5, characterized in that: The reset structure (7) includes an elastic ring (71) that is compressed and elongated on the outer ring of all hooks (2).

7. A special tool for pulling out the lower bushing of a water turbine guide vane according to claim 5, characterized in that: The reset structure (7) includes a reset spring (72) disposed between the hook (2) and the pull body (1).

8. A special tool for pulling out the lower bushing of a water turbine guide vane according to claim 6 or 7, characterized in that: The upper part of the pull body (1) is threaded with a hook (8).

9. A special tool for pulling out the lower bushing of a water turbine guide vane according to claim 5, characterized in that: The bottom end of the pull body (1) is provided with a positioning part (9) that engages with the ejector mechanism (3) to make the pull body and the ejector mechanism (3) concentric.

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