Nut fastening tool for steam turbine

Abstract

The utility model relates to the technical field of steam turbine power generation, in particular to a nut fastening tool for a steam turbine. The nut fastening tool comprises a wrench, an extension arm and a positioning clamping jaw assembly, the extension arm comprises an extension rod and a stress rod which are connected, the wrench is arranged on the extension rod in a sleeving mode and can slide in the length direction of the extension rod, and by arranging the extension rod and the stress rod, the stress end of the wrench can extend to a controllable space outside a valve frame of a valve control seat; a worker can conveniently and rapidly knock the wrench in the controllable space, so that the locking nut can meet the specified torque requirement. In addition, the positioning clamping jaw assembly is detachably connected with the side, away from the stress rod, of the extension rod, the clamping center of the positioning clamping jaw assembly is coaxial with the center of the wrench, and the positioning clamping jaw assembly can be arranged on a stepped ring of the piston rod in a sleeving mode. In the process of fastening the nut, the positioning clamping jaw assembly can ensure that when the wrench is knocked, the wrench stably acts on the nut all the time and cannot be separated from the locking nut.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine power generation technology, and in particular to a nut fastening tool for steam turbines. Background Technology

[0002] In the steam turbine power generation technology system, the connection and coordinated operation of the high-pressure main steam valve hydraulic actuator and the valve control seat play a crucial role in the stable and safe operation of the steam turbine. Specifically, the high-pressure main steam valve hydraulic actuator is installed on the valve control seat. When the piston of the high-pressure main steam valve hydraulic actuator moves, it drives the valve stem of the valve control seat to move synchronously, thereby realizing the opening and closing of the valve.

[0003] When the high-pressure main steam valve hydraulic actuator and the valve control seat are connected, the valve stem of the valve control seat must pass through the end of the piston rod of the high-pressure main steam valve hydraulic actuator, and then be connected and fixed with a nut. However, the internal operating space of the valve control seat is extremely limited. After the nut is installed, it is difficult to tighten it with a wrench, which makes it impossible to achieve the specified torque requirement for tightening the nut.

[0004] During turbine operation, nuts can easily loosen if not properly tightened. Once a nut comes loose, the piston rod of the hydraulic actuator will detach from the valve stem of the valve control seat, causing the valve to fail to close. This can not only lead to turbine overspeed accidents, posing a serious threat to equipment and personnel safety, but also cause huge economic losses and affect the stable operation of the entire power generation system. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, this utility model provides a nut fastening tool for steam turbines, which solves the technical problem that the valve rod in the valve control seat and the piston rod in the hydraulic actuator are prone to loosening.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0009] This utility model provides a nut tightening tool for a steam turbine, including a wrench, an extension arm, and a positioning jaw assembly. The wrench can be fitted onto the nut. The extension arm includes a connected extension rod and a force-bearing rod, with the axis of the extension rod perpendicular to the axis of the force-bearing rod. The wrench is fitted onto the extension rod and can slide along the length of the extension rod. The positioning jaw assembly is detachably connected to the side of the extension rod away from the force-bearing rod. The clamping center of the positioning jaw assembly is coaxial with the center of the wrench and can be fitted onto the stepped ring of the piston rod.

[0010] Preferably, the transverse cross-section of the extension rod is a first rectangle; the end of the wrench is provided with a first rectangular groove that matches the first rectangle, and the first rectangular groove is fitted onto the extension rod.

[0011] Preferably, the positioning gripper assembly includes a gripper body and a connecting rod, the end of the gripper body is sleeved on the connecting rod, and the gripper body can slide along the connecting rod; one end of the connecting rod is threadedly connected to the end of the extension rod.

[0012] Preferably, the gripper body includes a clamping part and a connecting part; the connecting part is sleeved on the connecting rod, and the clamping center of the clamping part is coaxial with the center of the wrench.

[0013] Preferably, the clamping part includes a fixed arc segment and a movable arc segment; the fixed arc segment is connected to the connecting part, the first side of the movable arc segment is hinged to the first side of the fixed arc segment, the second side of the movable arc segment is detachably connected to the second side of the fixed arc segment, and the fixed arc segment and the movable arc segment together form a ring structure, which is used to clamp the stepped ring.

[0014] Preferably, the movable arc segment comprises multiple movable arc units connected end to end in sequence; adjacent movable arc units are hinged together.

[0015] Preferably, the clamping part further includes a locking pin; the second side of the movable arc segment is inserted into the second side of the fixed arc segment and locked by the locking pin.

[0016] Preferably, the positioning gripper assembly further includes a limiting nut; the limiting nut is threaded to the other side of the connecting rod to limit the gripper body.

[0017] Preferably, the transverse cross-section of the connecting rod is a second rectangle; the end of the connecting part is provided with a second rectangular groove that matches the second rectangle, and the second rectangular groove of the connecting part is sleeved on the connecting rod.

[0018] (III) Beneficial Effects

[0019] The beneficial effects of this utility model are:

[0020] This utility model discloses a nut tightening tool for steam turbines. It includes a wrench, an extension arm, and a positioning gripper assembly. The extension arm comprises a connected extension rod and a force-bearing rod, with the axis of the extension rod perpendicular to the axis of the force-bearing rod. The wrench is mounted on the extension rod and can slide along its length. By including the extension rod and the force-bearing rod, the force-bearing end of the wrench can be extended to the operable space outside the valve frame of the valve control seat. In actual operation, the operator can conveniently tap the wrench within this operable space to tighten the nut to the specified torque. This effectively prevents the nut from loosening during steam turbine operation due to insufficient tightening, prevents the valve stem in the valve control seat from separating from the piston rod in the hydraulic actuator, fundamentally ensures the effectiveness of valve closure, avoids steam turbine overspeed accidents, greatly improves equipment and personnel safety, reduces potential economic losses, and maintains the stable operation of the entire power generation system.

[0021] Furthermore, the positioning jaw assembly is detachably connected to the side of the extension rod away from the force-bearing rod, and its clamping center is coaxial with the center of the wrench and can be fitted onto the stepped ring of the piston rod. During the tightening of the nut, the positioning jaw assembly ensures that the wrench remains stably applied to the nut when struck, and will not disengage from the locking nut. This stable operating state greatly improves the reliability of the nut tightening tool in actual use, further ensuring the smooth progress of nut tightening and the stability of the tightening effect. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure used in the nut fastening tool of this utility model;

[0023] Figure 2 A schematic diagram of a nut fastening tool installed on a nut;

[0024] Figure 3 for Figure 1 A schematic diagram of the structure of the valve frame removed in the middle;

[0025] Figure 4 This is a schematic diagram of the structure of a nut tightening tool;

[0026] Figure 5 for Figure 4 A schematic diagram of its breakdown.

[0027] [Explanation of Labels in the Attached Image]

[0028] 1: Wrench; 2: Extension arm; 21: Extension rod; 22: Force-bearing rod; 3: Positioning gripper assembly; 31: Gripper body; 311: Clamping part; 3111: Fixed arc section; 3112: Movable arc section; 3113: Locking pin; 312: Connecting part; 32: Connecting rod; 33: Limit nut; a: Piston rod; b: Valve rod; c: Valve bracket; d: Nut. Detailed Implementation

[0029] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figures 1-2 As shown, this embodiment provides a nut tightening tool for a steam turbine, used to tighten the nut d connecting the piston rod a in the high-pressure main steam valve hydraulic actuator and the valve rod b in the valve control seat. The valve control seat also includes a valve holder c for fixing, with the connecting ends of the piston rod a and valve rod b located within the valve holder c.

[0031] like Figure 3 As shown, the nut tightening tool includes a wrench 1, an extension arm 2, and a positioning jaw assembly 3. The wrench 1 can be fitted onto the nut d for tightening the nut d. The extension arm 2 includes a connected extension rod 21 and a force-bearing rod 22. The axis of the extension rod 21 is perpendicular to the axis of the force-bearing rod 22. The wrench 1 is fitted onto the extension rod 21 and can slide along the length of the extension rod 21. By setting the extension rod 21 and the force-bearing rod 22, the force-bearing end of the wrench 1 can be extended to the operable space outside the valve frame c of the valve control seat. In actual operation, Within this operable space, the operator can conveniently tap the wrench 1 to ensure that the locking nut d reaches the specified torque requirement. This effectively prevents the nut d from loosening during turbine operation due to insufficient tightening, and prevents the valve stem b in the valve control seat from separating from the piston rod a in the hydraulic actuator. This fundamentally ensures the effectiveness of valve closure, avoids turbine overspeed accidents, greatly improves the safety of equipment and personnel, reduces potential economic losses, and maintains the stable operation of the entire power generation system.

[0032] Furthermore, the positioning jaw assembly 3 is detachably connected to the side of the extension rod 21 away from the force-bearing rod 22, and its clamping center is coaxial with the center of the wrench 1 and can be fitted onto the stepped ring of the piston rod a. During the tightening of the nut d, the positioning jaw assembly 3 ensures that when the wrench 1 is struck, the wrench 1 always acts stably on the nut d and will not disengage from the locking nut d. This stable operating state greatly improves the reliability of the nut tightening tool in actual use, further ensuring the smooth progress of the nut d tightening work and the stability of the tightening effect.

[0033] In order to make the end of the wrench 1 move together with the extension rod 21 when it is struck, the transverse cross section of the extension rod 21 is a first rectangle, and the end of the wrench 1 is provided with a first rectangular groove that matches the first rectangle. The first rectangular groove is fitted onto the extension rod 21, which effectively prevents relative rotation between the wrench 1 and the extension rod 21, ensuring that the force can be stably and accurately transmitted to the nut d when the wrench 1 is struck, thereby improving the accuracy and stability of the nut tightening operation.

[0034] like Figure 4 As shown, the positioning gripper assembly 3 includes a gripper body 31 and a connecting rod 32. The end of the gripper body 31 is sleeved on the connecting rod 32, and the gripper body 31 can slide along the connecting rod 32. One end of the connecting rod 32 is threadedly connected to the end of the extension rod 21. The design that the gripper body 31 can slide along the connecting rod 32 allows the positioning gripper assembly 3 to flexibly adapt to the stepped ring of the piston rod a in different positions, enhancing the tool's versatility. The threaded connection between the connecting rod 32 and the extension rod 21 facilitates the installation and disassembly of the positioning gripper assembly 3, significantly improving work efficiency during tool maintenance or component replacement for different working conditions.

[0035] like Figures 4-5 As shown, the gripper body 31 includes a clamping part 311 and a connecting part 312 connected together. The connecting part 312 is sleeved on the connecting rod 32, and the clamping center of the clamping part 311 is coaxial with the center of the wrench 1. The clamping part 311 includes a fixed arc-shaped segment 3111, a movable arc-shaped segment 3112, and a locking pin 3113. The fixed arc-shaped segment 3111 is connected to the connecting part 312. The first side of the movable arc-shaped segment 3112 is hinged to the first side of the fixed arc-shaped segment 3111, and the second side of the movable arc-shaped segment 3112 is inserted into the second side of the fixed arc-shaped segment 3111 and locked by the locking pin 3113. The fixed arc-shaped segment 3111 and the movable arc-shaped segment 3112 together form a ring structure, which is used to clamp the stepped ring of the piston rod a. The openable ring structure design allows the positioning gripper assembly 3 to be easily installed on the stepped ring of the piston rod a.

[0036] The movable arc segment 3112 includes multiple movable arc units connected end to end in sequence; the hinge between two adjacent movable arc units enhances the flexibility and adjustability of the movable arc segment 3112. Especially in the case of installation environment with limited space, the fixed arc segment 3111 can be brought close to the stepped ring first, and then the movable arc segment 3112 can be opened by hinge and connected around the stepped ring, which greatly improves the ease of installation of the tool in complex working conditions.

[0037] In this embodiment, the transverse cross-section of the connecting rod 32 is a second rectangle, and the end of the connecting part 312 is provided with a second rectangular groove that matches the second rectangle. The second rectangular groove of the connecting part 312 is sleeved on the connecting rod 32, so that when the gripper body 31 slides along the connecting rod 32, it can effectively prevent relative rotation between the gripper body 31 and the connecting rod 32. In order to prevent the gripper body 31 from falling off the connecting rod 32, the positioning gripper assembly 3 also includes a limiting nut 33, which is threadedly connected to the other side of the connecting rod 32 to limit the gripper body 31.

[0038] During installation, firstly, slide the gripper body 31 of the positioning gripper assembly 3 along the connecting rod 32 to accurately move the gripper body 31 to the corresponding position of the stepped ring of the piston rod a. Next, install the clamping part 311 of the gripper body 31 onto the stepped ring of the piston rod a. Specifically, first, place the fixed arc segment 3111 close to one side of the stepped ring, then close the movable arc segment 3112 by hinge, allowing it to surround the stepped ring. Then, insert the second side of the movable arc segment 3112 into the second side of the fixed arc segment 3111, and securely lock it with the locking pin 3113, ensuring that the clamping part 311 is tightly and stably fitted onto the stepped ring, providing a reliable positioning basis for subsequent operations. Then, slide the wrench 1 along the extension rod 21, and fine-tune it to precisely fit the wrench 1 onto the nut d to be tightened. Finally, use a suitable tapping tool to tap the end of the force-bearing rod 22.

[0039] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0040] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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 communication of two components or the interaction between 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.

[0041] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0043] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A nut fastening tool for a steam turbine, characterized by, The nut fastening tool for steam turbine comprises a wrench (1), an extension arm (2) and a positioning jaw assembly (3), the wrench (1) is sleeved on a nut (d); the extension arm (2) comprises a connecting extension rod (21) and a force rod (22), the axis of the extension rod (21) is perpendicular to the axis of the force rod (22), the wrench (1) is sleeved on the extension rod (21) and can slide along the length direction of the extension rod (21); the positioning jaw assembly (3) is detachably connected with the extension rod (21) away from the force rod (22), the clamping center of the positioning jaw assembly (3) is coaxial with the center of the wrench (1) and can be sleeved on the stepped ring of a piston rod (a).

2. The nut fastening tool for steam turbine according to claim 1, wherein: the transverse section of the extension rod (21) is a first rectangle; the end of the wrench (1) is provided with a first rectangular slot matched with the first rectangle, and the first rectangular slot is sleeved on the extension rod (21).

3. The nut fastening tool for steam turbine according to claim 1, wherein: the positioning jaw assembly (3) comprises a jaw body (31) and a connecting rod (32), the end of the jaw body (31) is sleeved on the connecting rod (32), and the jaw body (31) can slide along the connecting rod (32); one end of the connecting rod (32) is threadedly connected with the end of the extension rod (21).

4. The nut fastening tool for steam turbine according to claim 3, wherein: the jaw body (31) comprises a clamping part (311) and a connecting part (312); the connecting part (312) is sleeved on the connecting rod (32), and the clamping center of the clamping part (311) is coaxial with the center of the wrench (1).

5. The nut fastening tool for steam turbine according to claim 4, wherein: the clamping part (311) comprises a fixed arc segment (3111) and a movable arc segment (3112); the fixed arc segment (3111) is connected with the connecting part (312), the first side of the movable arc segment (3112) is hinged with the first side of the fixed arc segment (3111), the second side of the movable arc segment (3112) is detachably connected with the second side of the fixed arc segment (3111), and the fixed arc segment (3111) and the movable arc segment (3112) jointly form a circular ring structure for clamping the stepped ring.

6. The nut fastening tool for steam turbine according to claim 5, wherein: the movable arc segment (3112) comprises a plurality of movable arc units connected in sequence; two adjacent movable arc units are hinged.

7. The nut fastening tool for steam turbine according to claim 5, wherein: the clamping part (311) further comprises a locking pin (3113); the second side of the movable arc segment (3112) is inserted into the second side of the fixed arc segment (3111) and locked by the locking pin (3113). 8.The nut fastening tool for a steam turbine according to claim 3, characterized in that: the positioning jaw assembly (3) further comprises a limiting nut (33); the limiting nut (33) is threadedly connected with the other side of the connecting rod (32) to limit the jaw body (31). 9.The nut fastening tool for a steam turbine according to claim 4, characterized in that: a transverse section of the connecting rod (32) is a second rectangle; an end of the connecting portion (312) is provided with a second rectangular slot matching the second rectangle, and the second rectangular slot of the connecting portion (312) is sleeved on the connecting rod (32).

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