A main steam valve pre-opening valve dismounting and main steam valve rod reverse self-sealing grinding tool

Abstract

This utility model discloses a tool for disassembling and assembling a main steam valve pre-opening valve and for grinding the main steam valve stem in reverse self-sealing mode. The tool includes: a tool body with a through hole in the center for the valve stem of the main steam valve pre-opening valve to pass through; a first centering component and a second centering component; a rotating handle mounted on the tool body for hand gripping and rotating the tool body; and a disassembly component mounted on the tool body, which engages with a process hole in the inner liner to provide torque for rotating the inner liner around its central axis. In this utility model, the first and second centering components radially position the main steam valve pre-opening valve, and the disassembly, assembly, and grinding of the workpiece can be achieved by rotating the tool body using the rotating handle.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine maintenance technology, and in particular to a tool for disassembling and assembling the main steam valve pre-opening valve and for grinding the main steam valve stem in reverse self-sealing mode. Background Technology

[0002] Because the main steam valve pre-opening valve plays a crucial role in the operation of the steam turbine, its disassembly and assembly are common tasks in routine turbine maintenance and repair. However, in practice, the complexity of turbine operation and the inherent structure of the main steam valve pre-opening valve itself make its maintenance challenging.

[0003] like Figures 1-3 As shown, the main steam valve pre-opening valve 2 is located inside the main valve, and the inner bushing 1 is fitted onto the lower end of the main steam valve pre-opening valve 2. The main steam valve pre-opening valve 2 and the outer bushing 3 are assembled by installing the inner bushing 1 into the stepped hole inside the outer bushing 3. During on-site maintenance, the inner bushing 1 must be unscrewed before the main steam valve pre-opening valve 2 can be removed. Due to the lack of specialized disassembly tools, the traditional hammering method is used, which sometimes damages the sealing surface. In addition, after disassembly, the reverse sealing surface 22 on the back of the small valve head 21 of the main steam valve pre-opening valve 2 needs to be ground. A separate grinding platform is required to align the main steam valve pre-opening valve 2, making the maintenance work cumbersome. Utility Model Content

[0004] In order to solve the problems in the prior art, this utility model provides a tool for disassembling and assembling the main steam valve pre-opening valve and for grinding the main steam valve stem in reverse self-sealing mode.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A tool for disassembling and assembling the main steam valve pre-opening valve and for grinding the main steam valve stem in reverse self-sealing mode, comprising:

[0007] The tool body has a through hole in the middle for the valve stem of the main steam valve pre-opening valve to pass through. The tool body is provided with a first centering member and a second centering member. When the first centering member contacts the upper end hole of the stepped hole inside the outer bushing, it generates a geometric constraint to force the rotation center axes of the two to align. When the second centering member contacts the outer wall of the valve stem of the main steam valve pre-opening valve, it generates a geometric constraint to force the rotation center axes of the two to align.

[0008] A rotating handle is provided on the tool body for gripping and rotating the tool body by hand.

[0009] The disassembly component is mounted on the tool body and engages with the inner bushing process hole to provide the inner bushing with a torque for rotation about its own central axis.

[0010] Preferably, the outer contour of the tool body is cylindrical, and the first centering component includes the outer peripheral surface of the tool body, and the outer peripheral surface of the tool body and the upper end hole of the stepped hole inside the outer bushing are in clearance fit.

[0011] Preferably, the through hole in the middle of the tool body is a circular hole with a circular cross-section, and the second centering component includes the hole wall of the circular hole, which is clearance-fitted with the reverse sealing surface of the main steam valve pre-opening valve.

[0012] Preferably, the disassembly component includes disassembly claws that extend downward from the lower end of the tool body to the process hole on the inner bushing and are arranged symmetrically front to back. During disassembly, the disassembly claws are inserted into the process hole on the inner bushing.

[0013] Preferably, a guide is provided at the lower end of the disassembly claw.

[0014] Preferably, the guide is a bullet-shaped guide head at the lower end of the disassembly claw.

[0015] Preferably, the rotating handle includes handles symmetrically arranged on the left and right sides of the upper end of the tool body.

[0016] The beneficial effects of this utility model are:

[0017] 1. By fitting the tool body through hole onto the valve stem of the main steam valve pre-opening valve, inserting the lower end of the tool body into the upper end of the stepped hole inside the outer bushing, inserting the disassembly claw into the process hole on the inner bushing, rotating the handle to drive the inner bushing, and then unscrewing the inner bushing from the outer bushing, non-destructive disassembly and assembly are achieved, making the disassembly and assembly work simple and efficient.

[0018] 2. By matching the outer circumferential surface of the tool body with the upper end hole of the stepped hole inside the outer bushing, and the through hole in the middle of the tool body with the reverse sealing surface of the main steam valve pre-start valve stem, manual rotary grinding can achieve automatic centering without the need for a grinding platform. This ensures the grinding effect between the reverse sealing surface of the main steam valve pre-start valve stem and the reverse sealing surface of the inner bushing, guarantees the centering and the flatness of the sealing surface, ensures the grinding effect, greatly improves the efficiency of maintenance work, and reduces the difficulty of the work. Attached Figure Description

[0019] Figure 1 This is a frontal three-dimensional structural diagram showing the connection relationship between the main steam valve pre-opening valve, inner bushing, and outer bushing.

[0020] Figure 2 This is an exploded diagram of the main steam valve pre-opening valve, inner bushing, and outer bushing.

[0021] Figure 3 This is a top view of the inner liner;

[0022] Figure 4 This is a frontal three-dimensional structural diagram of the present invention;

[0023] Figure 5 This is a three-dimensional structural diagram of the present invention viewed from below;

[0024] Figure 6 This is a schematic diagram of the working state of this utility model.

[0025] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0027] A tool for disassembling and assembling the main steam valve pre-opening valve and for grinding the main steam valve stem in reverse self-sealing mode includes a tool body 41, the cross-sectional dimension of which is smaller than the diameter of the upper end hole of the stepped hole inside the outer bushing 3.

[0028] The tool body 41 has a through hole arranged vertically in the middle, which is used to allow the valve stem 23 of the main steam valve pre-opening valve 2 to pass through.

[0029] The tool body 41 is provided with a rotating handle for gripping and rotating the tool body 41 by hand. In this embodiment, the rotating handle includes handles 42 symmetrically arranged on the left and right sides of the upper end of the tool body 41.

[0030] The tool body 41 is provided with a disassembly component, which cooperates with the process hole 11 on the inner bushing 1 to provide the inner bushing 1 with torque for rotation about its own central axis. In this embodiment, the disassembly component includes a disassembly claw 44 extending downward from the lower end of the tool body 41 corresponding to the process hole 11 on the inner bushing 1 and arranged symmetrically front and back. During disassembly, the disassembly claw 44 is inserted into the process hole 11 on the inner bushing 1.

[0031] To facilitate the insertion of the disassembly claw 44 into the process hole 11 on the inner bushing 1, the lower end of the disassembly claw 44 is bullet-shaped.

[0032] In order to grind the reverse sealing surface 22 of the main steam valve pre-opening valve 2, the tool body 41 is provided with a first centering member and a second centering member. When the first centering member contacts the upper end hole of the stepped hole inside the outer bushing 3, a geometric constraint is generated to force the central axes of the two to align. When the second centering member contacts the outer wall of the valve stem 23 of the main steam valve pre-opening valve 2, a geometric constraint is generated to force the central axes of the two to align.

[0033] In this embodiment, the outer contour of the tool body 41 is a cylinder, and the first centering component includes the outer peripheral surface of the tool body 41. Automatic centering is achieved through the mating of the cylindrical surfaces. The outer peripheral surface of the tool body 41 and the upper end hole of the stepped hole inside the outer bushing 3 are fitted with a clearance of 10-30 microns.

[0034] In this embodiment, the through hole in the middle of the tool body 41 is a circular hole 43, and the cross-section of the circular hole 43 is circular. The second centering component includes the hole wall of the circular hole 43. Automatic centering is achieved through cylindrical surface mating. The hole wall of the circular hole 43 and the reverse sealing surface 22 of the main steam valve pre-opening valve 2 are in clearance mating, and the mating clearance is 10-30 microns.

[0035] The main steam valve pre-start valve, inner bushing, and outer bushing are all existing technologies, and their specific structures and fit relationships are irrelevant to the present invention, so they will not be described in detail here.

[0036] The working principle of this utility model is as follows:

[0037] During disassembly and assembly:

[0038] First, hold the handle 42 and pass the tool body 41 through the upper end of the valve stem 23 of the main steam valve pre-opening valve 2 with the round hole 43 in the middle facing downwards; then, align the disassembly claw 44 with the process hole 11 of the inner bushing 1 and insert it; next, hold the handle 42 and rotate the tool body 41 so that the tool body 41 rotates around its own rotation axis, thereby removing the inner bushing 1 from the outer bushing 3, and finally lift the valve stem 23 of the main steam valve pre-opening valve 2.

[0039] The assembly process follows the same principle as the disassembly process, and will not be repeated here.

[0040] During grinding:

[0041] First, place the inner bushing 1 onto the lower end of the main steam valve pre-opening valve 2 and insert both into the outer bushing 3. Then, holding the handle 42, pass the tool body 41 with the central hole 43 facing downwards through the upper end of the valve stem 23 of the main steam valve pre-opening valve 2. Insert the lower end of the tool body 41 into the upper end of the stepped hole inside the outer bushing 3. Align the disassembly claw 44 with the process hole 11 of the inner bushing 1 and insert it. At this point, the central axis of the valve stem 23 of the main steam valve pre-opening valve 2 coincides with the central axis of the outer bushing 3. This allows for radial positioning of the valve stem 23 of the main steam valve pre-opening valve 2. After applying abrasive to the reverse sealing surface 22 of the main steam valve pre-opening valve 2, the tool body 41 is rotated back and forth along the horizontal plane by holding the handle 42. The disassembly claw 44 then drives the inner bushing 1 to rotate back and forth in the horizontal plane. The valve stem 23 of the main steam valve pre-opening valve 2 is then manually pulled up so that the valve stem 23 and the inner bushing 1 are in full contact in the axial direction, thus achieving the grinding of the reverse sealing surface 22 of the main steam valve pre-opening valve 2 against the inner bushing 1.

[0042] The above embodiments are only used to illustrate and not limit the technical solutions of this utility model. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the utility model without departing from the spirit and scope of the utility model. Any modifications or partial substitutions should be covered within the scope of the claims of this utility model.

[0043] If the terms "first" or "second" are used in this document to define the components, those skilled in the art should know that the use of "first" or "second" is merely for the convenience of describing this utility model and simplifying the description, and unless otherwise stated, the above terms have no special meaning.

[0044] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0045] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0046] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A main steam valve pre-opening valve dismounting and main steam valve stem reverse self-sealing grinding tool, characterized in that, include: The tool body has a through hole in the middle for the valve stem of the main steam valve pre-opening valve to pass through. The tool body is provided with a first centering member and a second centering member. When the first centering member contacts the upper end hole of the stepped hole inside the outer bushing, it generates a geometric constraint to force the rotation center axes of the two to align. When the second centering member contacts the outer wall of the valve stem of the main steam valve pre-opening valve, it generates a geometric constraint to force the rotation center axes of the two to align. A rotating handle is provided on the tool body for gripping and rotating the tool body by hand. The disassembly component is mounted on the tool body and engages with the inner bushing process hole to provide the inner bushing with a torque for rotation about its own central axis.

2. The main steam valve pre-opening valve disassembly and assembly and main steam valve stem reverse self-sealing grinding tool as described in claim 1, characterized in that, The outer contour of the tool body is cylindrical. The first centering component includes the outer peripheral surface of the tool body and the upper end hole of the stepped hole inside the outer bushing with clearance fit.

3. The main steam valve pre-opening valve disassembly and assembly and main steam valve stem reverse self-sealing grinding tool as described in claim 1, characterized in that, The through hole in the middle of the tool body is a circular hole with a circular cross-section. The second centering component includes the hole wall of the circular hole, and the hole wall of the circular hole and the reverse sealing surface of the main steam valve pre-opening valve are in clearance fit.

4. A master valve pre-opening valve dismounting and master valve stem reverse self-sealing grinding tool as claimed in claim 1, characterized in that, The disassembly component includes disassembly claws that extend downward from the lower end of the tool body to the process hole on the inner bushing and are arranged symmetrically front to back. During disassembly, the disassembly claws are inserted into the process hole on the inner bushing.

5. The main steam valve pre-opening valve disassembly and assembly and main steam valve stem reverse self-sealing grinding tool as described in claim 4, characterized in that, A guide is provided at the lower end of the disassembly claw.

6. The main steam valve pre-opening valve disassembly and assembly and main steam valve stem reverse self-sealing grinding tool as described in claim 5, characterized in that, The guide is a bullet-shaped guide head at the lower end of the disassembly claw.

7. A master valve pre-opening valve dismounting and master valve stem reverse self-sealing grinding tool as claimed in claim 1, characterized in that, The rotating handle includes handles symmetrically arranged on the left and right sides of the upper part of the tool body.

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