Self-locking device for knocking wrench of high temperature bolt of steam turbine

Abstract

The utility model discloses a kind of self-locking devices of steam turbine high-temperature bolt knocking wrench, it is related to industrial equipment maintenance technical field.The device includes knocking wrench, self-locking washer, spring washer and self-locking bolt.The sleeve ring end of knocking wrench is set on high-temperature cover screw cap;Self-locking washer is arranged at the top of sleeve ring, the center through-hole is worn self-locking bolt, and bottom boss structure is matched with the shape of sleeve ring inside and is inserted into sleeve ring inside;Self-locking bolt is screwed into dust hole or heating hole of high-temperature cover screw cap, and forms rigid constraint.Further optimization scheme, sleeve ring lower end can be provided with clamping ring with clamping groove, and adapt to slotted screw cap.Through self-locking structure replaces artificial firm, completely eliminates wrench drop and object strike risk;Realize single-person operation, avoid body to enter equipment dangerous area, reduce high-temperature scald hidden danger;Modular self-locking washer adapts to hexagon, plum blossom and slotted and other various screw cap system, and compatibility is strong.

Description

Technical Field

[0001] This utility model relates to the field of industrial equipment maintenance technology, specifically a self-locking device for a high-temperature bolt striking wrench for steam turbines. Background Technology

[0002] Currently, steam turbines utilize high-temperature, high-pressure steam as their power source to drive the turbine and generate electricity, representing a conversion from thermal energy to kinetic energy to electrical energy. Because the driving steam temperature is high, generally exceeding 380℃, the fasteners in the turbine structure must be heat-resistant; therefore, all turbine bolts are high-temperature bolts. According to maintenance guidelines, steam turbines require a Class A overhaul every 5-7 years to ensure equipment safety and economy. During Class A overhauls, the installation process for the high-temperature bolts involves first using a conventional hammer and wrench to cold-tighten according to torque requirements, followed by heating the bolts using a heater designed and provided by the turbine manufacturer. The disassembly process for the high-temperature bolts is the reverse sequence. In the conventional process of installing and removing high-temperature screws, one person needs to stabilize the wrench by hand and foot while another person uses a hammer to strike it. This poses a significant risk of impact and the wrench falling. To address this, a self-locking device for the turbine high-temperature screw striking wrench was specially designed. This changes the conventional method of manually stabilizing the wrench and the two-person cooperation process, reducing the risk of impact and wrench falling during the installation and removal of high-temperature screws, increasing process safety, and improving labor efficiency. Utility Model Content

[0003] The purpose of this utility model is to solve the problem of the risk of object impact and wrench drop when installing and disassembling high-temperature bolts using conventional processes during Class A maintenance of steam turbines. A self-locking device for high-temperature bolt impact wrenches of steam turbines has been specially designed.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A self-locking device for a high-temperature bolt striking wrench for steam turbines includes a striking wrench, a self-locking washer, a spring washer, and a self-locking bolt. The striking wrench has a collar on the side connected to the high-temperature cover nut, which is fitted onto the disassembled high-temperature cover nut. The self-locking washer is located on the collar and has a boss structure. The self-locking washer has a through hole in its center, and the boss structure matches the shape of the inner side of the collar. The boss structure is inserted into the collar. A self-locking bolt passes through the through hole of the self-locking washer for screwing into the dustproof hole or heating hole of the disassembled high-temperature cover nut.

[0006] Furthermore, the lower end of the collar is provided with a snap-fit ​​ring, which extends along the central axis of the collar and has a snap-fit ​​groove that matches the groove of the high-temperature cover nut.

[0007] Furthermore, the dimensions of the boss structure are slightly smaller than the inner side of the wrench ring.

[0008] Furthermore, a spring washer is provided between the self-locking washer and the self-locking bolt.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] 1. Enhanced safety: Completely eliminates the manual stabilization step in traditional processes, reducing the probability of object impact; the rigid constraint mechanism formed by the self-locking washer and self-locking bolt makes the wrench detachment accident rate approach zero.

[0011] 2. Optimized operation process: The entire operation can be completed by a single person, reducing the level of work intensity; it avoids the operator's limbs from entering the dangerous area of ​​the equipment, reducing the risk of high temperature burns.

[0012] 3. Strong compatibility: The modular design of the self-locking gasket, with hexagonal / torch / slotted options, is compatible with all specifications of high-temperature screws. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a top view of the self-locking gasket I of this utility model;

[0015] Figure 3 This is a top view of the self-locking gasket II of this utility model;

[0016] Figure 4 This is a schematic diagram of the structure of Embodiment 2 of this utility model;

[0017] Figure 5 This is a top view of the self-locking gasket III of this utility model;

[0018] In the diagram, 1-striking wrench, 2-self-locking washer, 201-boob structure, 3-spring washer, 4-self-locking bolt, 5-high temperature cover nut, 6-high temperature screw, 7-dustproof screw, 8-clamping ring, 9-clamping groove. Detailed Implementation

[0019] The technical solution of this utility model will be further described below with reference to the accompanying drawings.

[0020] Example 1

[0021] like Figure 1-3 As shown, a self-locking device for a high-temperature bolt striking wrench for a steam turbine includes a striking wrench 1, a self-locking washer 2, a spring washer 3, and a self-locking bolt 4.

[0022] Both the high-temperature screw 6 and the high-temperature shroud nut 5 of the steam turbine are designed with dustproof screws 7. First, remove the dustproof screw 7 from the top of the high-temperature shroud nut 5, and place the corresponding size striking wrench 1 on the removed high-temperature shroud nut 5. The side of the striking wrench 1 that connects to the high-temperature shroud nut 5 is a collar, which is fitted onto the removed high-temperature shroud nut 5. The collar matches the shape of the high-temperature shroud nut 5. If the high-temperature shroud nut 5 is a hexagonal high-temperature shroud nut 5, then the striking wrench 1 is a hexagonal wrench; if the high-temperature shroud nut 5 is a box-type high-temperature shroud nut 5, then the striking wrench 1 is a box-type wrench.

[0023] After the striking wrench 1 is fixed to the high-temperature cover nut 5, the self-locking washer 2 is installed on the collar of the striking wrench 1. The self-locking washer 2 has a boss structure 201. The size of the boss structure 201 is slightly smaller than the inner side of the collar of the striking wrench 1. The center of the self-locking washer 2 has a through hole. The boss structure 201 matches the shape of the inner side of the collar and is also machined into a hexagonal or plum blossom shape. The boss structure 201 of the self-locking washer I 2 is hexagonal, and the boss structure 201 of the self-locking washer II 2 is plum blossom shaped. The boss structure 201 is inserted into the collar of the corresponding shape. The self-locking bolt 4 is inserted through the through hole of the self-locking washer 2. A spring washer 3 is also provided between the self-locking washer 2 and the self-locking bolt 4. The spring washer 3 is installed on the self-locking bolt 4, and then the self-locking bolt 4 is screwed into the dustproof internal thread of the heating hole of the high-temperature screw of the turbine 6.

[0024] At this point, the wrench 1 is securely fixed to the high-temperature cap nut 5 using a self-locking device. The bolt is then removed by striking the wrench 1 counterclockwise with a conventional hammer.

[0025] Example 2

[0026] like Figure 3-5 The diagram shown is a structural schematic of the second embodiment of the present invention. Unlike the above embodiment, the striking wrench 1 is specially designed for the slotted high-temperature cover nut 5. The inner side of the collar is circular, and the boss structure 201 of the self-locking washer Ⅲ2 is also circular. A snap-fit ​​ring 8 is provided at the lower end of the collar. The snap-fit ​​ring 8 extends along the central axis of the collar and has a snap-fit ​​groove 9. The snap-fit ​​groove 9 matches the slot of the high-temperature cover nut 5.

Claims

1. A self-locking device for a high-temperature bolt striking wrench for steam turbines, characterized in that, The device includes a striking wrench (1), a self-locking washer (2), a spring washer (3), and a self-locking bolt (4). The striking wrench (1) is connected to the high-temperature cover nut (5) on one side, and the nut is fitted onto the disassembled high-temperature cover nut (5). The self-locking washer (2) is located on the nut and has a boss structure (201). The self-locking washer (2) has a through hole in the center and the boss structure (201) matches the shape of the inner side of the nut. The boss structure (201) is inserted into the nut. The self-locking bolt (4) is inserted through the through hole of the self-locking washer (2) for screwing into the dustproof hole or heating hole of the disassembled high-temperature cover nut (5).

2. The self-locking device for a high-temperature bolt striking wrench for steam turbines according to claim 1, characterized in that, The lower end of the collar is provided with a snap ring (8), which extends along the central axis of the collar. A snap groove (9) is provided on the snap ring (8), which matches the groove of the high temperature cover nut (5).

3. The self-locking device for a high-temperature bolt striking wrench for steam turbines according to claim 2, characterized in that, The size of the boss structure (201) is slightly smaller than the inner side of the collar of the striking wrench (1).

4. The self-locking device for a high-temperature bolt striking wrench for steam turbines according to any one of claims 1-3, characterized in that, A spring washer (3) is provided between the self-locking washer (2) and the self-locking bolt (4).

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