A tool for dismounting and mounting a steam turbine hot tight stud and nut

Abstract

The utility model is suitable for the field of steam turbine dismounting, disclose a kind of steam turbine hot tight stud bolt and nut dismounting tool and nut connecting tool, comprising: for lifting the lifting mechanism of nut and stud bolt, the nut connecting assembly of being fixed and being connected with the lifting mechanism by the lifting hole, the dismounting assembly of being sleeved on stud bolt upper end and being the bolt connecting assembly of being connected with the lifting mechanism with stud bolt thread hole connection;Lifting mechanism is connected with nut by nut connecting assembly, lifting mechanism is fixed after lifting hole first with nut, then is removed, then stud bolt is rotated from steam turbine by dismounting assembly, then bolt connecting assembly is connected with stud bolt thread hole, stud bolt is lifted and removed from steam turbine by lifting mechanism, dismounting is carried out by lifting equipment, reduce the dismounting of user using own strength, greatly improve installation efficiency, improve the security of dismounting operation.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine disassembly and assembly, and in particular to a tool for disassembling and assembling steam turbine hot-tightening double-ended bolts and nuts, and a nut connection tool. Background Technology

[0002] Existing methods for assembling and disassembling bolts and nuts typically rely on manual tools such as wrenches and screwdrivers. While these tools meet daily needs to some extent, for large equipment like steam turbines, where double-ended bolts and nuts weigh tens to hundreds of kilograms, traditional tools face numerous limitations and significant challenges when dealing with heavy double-ended bolts. These challenges include extremely difficult operation, high safety risks, low efficiency, and poor adaptability. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a tool for disassembling and assembling hot-tightening double-ended bolts and nuts for steam turbines.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: a tool for disassembling and assembling a steam turbine hot-tightened double-ended bolt and nut is constructed, comprising: a lifting mechanism for lifting the nut and double-ended bolt; a nut connecting assembly that connects and fixes the nut through the lifting hole and is connected to the lifting mechanism; a disassembly assembly that is sleeved on the upper end of the double-ended bolt and connects the double-ended bolt; and a bolt connecting assembly that is connected to the threaded hole of the double-ended bolt and is connected to the lifting mechanism. The lifting mechanism and the nut connecting assembly constitute a nut lifting system for lifting the nut, and the lifting mechanism, the disassembly assembly, and the bolt connecting assembly constitute a bolt lifting and disassembly system for disassembling and lifting the double-ended bolt.

[0005] In some embodiments, the disassembly assembly is provided with a mounting hole for engaging with a stud bolt. The diameter of the mounting hole near the stud bolt is larger than the outer diameter of the stud bolt. The cross-sectional area of ​​the mounting hole gradually decreases from the end near the stud bolt to the other end away from the stud bolt. The other end of the mounting hole is interference-fitted with the stud bolt.

[0006] In some embodiments, the end of the disassembly assembly away from the mounting hole is provided with a boss that facilitates wrench engagement.

[0007] In some embodiments, the disassembly assembly includes an elastic inner cover and an outer cover that fits over the inner cover, the boss being disposed on the outer cover, and the mounting hole being disposed inside the inner cover.

[0008] In some embodiments, the end of the mounting hole away from the double-ended bolt is provided with a plurality of wedges arranged around the inner wall of the mounting hole, the wedges protruding toward the double-ended bolt, and the wedges are interference-fitted with the double-ended bolt.

[0009] In some embodiments, the hoisting mechanism includes a gantry and a plurality of slings arranged linearly on the gantry, the slings being connected to the bolt connection assembly or the slings being connected to the nut connection assembly.

[0010] In some embodiments, the bolt connection assembly includes a lifting bolt head and a pin connected to a threaded hole. One end of the lifting bolt head is provided with an external thread that matches the threaded hole, and the other end is provided with a through hole that penetrates the lifting bolt head. The pin passes through the through hole. One end of the pin is provided with a stop portion with a diameter larger than the through hole, and the other end of the pin is provided with an outwardly protruding elastic ball head snap-fit. The lifting mechanism is connected to the pin.

[0011] In some embodiments, after the double-ended bolt is hoisted, a double-ended bolt protective sleeve is also provided at the double-ended bolt. The double-ended bolt protective sleeve can completely cover the hook and loop fastener base surface and the hook and loop fastener sling set on the hook and loop fastener base surface, with one end of the hook and loop fastener sling set on the hook and loop fastener base surface and the other end freely bent and pasted to any place on the hook and loop fastener base surface.

[0012] The technical solution adopted by this utility model to solve its technical problem is as follows: a nut connecting tool is constructed, including: a first clamp, a second clamp, and a locking ring. One end of the first clamp is rotatably connected to one end of the second clamp. The end of the first clamp away from the rotatable connection is provided with a first outwardly protruding locking portion. The second clamp is provided with a second locking portion mirroring the first clamp. The middle part of the first clamp is bent into an arc in the direction of the protrusion of the first locking portion. The second clamp is bent into an arc in the direction of the protrusion of the second locking portion. The locking ring movably engages the first clamp and the second clamp.

[0013] In some embodiments, the locking ring is provided with a sliding hole that matches the cross-sectional shape of the first gripper and the second gripper.

[0014] The present invention provides a tool for disassembling and assembling hot-tightened double-ended bolts and nuts for steam turbines, which has the following advantages: The lifting mechanism is connected to the nut through the nut connecting assembly. The lifting mechanism first fixes the nut through the lifting hole and then lifts it out. Then, the double-ended bolt is unscrewed from the steam turbine through the disassembly assembly. The bolt connecting assembly is then connected to the threaded hole of the double-ended bolt. The double-ended bolt is lifted and removed from the steam turbine by the lifting mechanism and disassembled by the lifting equipment. This reduces the need for users to use their own strength for disassembly, greatly improves installation efficiency, enhances the safety of disassembly operations, reduces the risk of safety accidents, and also reduces collision damage to the nut and double-ended bolt during disassembly. Attached Figure Description

[0015] To more clearly illustrate the technical solution of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of this utility model and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings:

[0016] Figure 1 This is a diagram illustrating the hoisting of a double-ended bolt for a steam turbine hot-tightening double-ended bolt and nut disassembly tool, according to one embodiment of this utility model.

[0017] Figure 2 This is a cross-sectional view of a double-ended bolt hoisting tool for disassembling and assembling hot-tightening double-ended bolts and nuts in one embodiment of this utility model;

[0018] Figure 3 This is a structural diagram of the disassembly assembly of a tool for disassembling and assembling hot-tight double-ended bolts and nuts for steam turbines, according to one embodiment of this utility model;

[0019] Figure 4 This is a cross-sectional view of the disassembly assembly of a tool for disassembling and assembling a steam turbine hot-tight double-ended bolt and nut, according to one embodiment of this utility model;

[0020] Figure 5 This is a diagram illustrating the nut hoisting of a tool for disassembling and assembling a steam turbine hot-tightening double-ended bolt and nut, according to one embodiment of this utility model.

[0021] Figure 6 This is a sectional view of the nut hoisting of the nut connecting tool in one embodiment of this utility model;

[0022] Figure 7 This is a structural diagram of a nut connection assembly of a steam turbine hot-tightening double-ended bolt and nut disassembly tool according to one embodiment of the present invention;

[0023] Figure 8 This is a structural diagram of a double-ended bolt protective sleeve for a turbine hot-tightening double-ended bolt and nut disassembly tool, as described in one embodiment of this utility model.

[0024] Figure Labels

[0025] 100. Lifting mechanism; 110. Lifting frame; 120. Lifting sling; 200. Disassembly assembly; 201. Boss; 202. Outer cover; 203. Inner cover; 204. Mounting hole; 205. Wedge; 210. Bolt connection assembly; 211. Lifting bolt head; 212. Through hole; 213. Pin; 214. Stop part; 215. Elastic ball head snap fastener; 300. Double-ended bolt; 310. Threaded hole; 400. Nut; 410. Lifting hole; 500. Nut connection assembly; 510. First gripper; 511. First snap-fit ​​part; 521. Second snap-fit ​​part; 520. Second gripper; 530. Locking ring; 600. Hook and loop fastener base surface; 610. Hook and loop fastener sling. Detailed Implementation

[0026] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "upper," "inner," and "outer" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0027] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "fixing," and "setting" 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. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. 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.

[0028] Figures 1 to 7This invention illustrates a tool for assembling and disassembling hot-tightened double-ended bolts and nuts for steam turbines, according to one embodiment of the present invention. This tool can be used for assembling and disassembling bolts and nuts in steam turbines. It may include a lifting mechanism 100 for lifting nuts 400 and double-ended bolts 300; a nut connecting assembly 500 that connects and fixes the nut 400 through a lifting hole 410 and is connected to the lifting mechanism 100; a disassembly assembly 200 that is sleeved on the upper end of the double-ended bolt 300 and connects to the double-ended bolt 300; and a bolt connecting assembly 210 that connects to the threaded hole 310 of the double-ended bolt 300 and is connected to the lifting mechanism 100. The lifting mechanism 100 and the nut connecting assembly 200 constitute a nut 400 lifting system for lifting the nut 400, and the lifting mechanism 100, the disassembly assembly 200, and the bolt connecting assembly 210 constitute a bolt lifting and disassembly system for disassembling and lifting the double-ended bolt 300.

[0029] The hoisting mechanism 100 is connected to the nut 400 via the nut connection assembly 500. The hoisting mechanism 100 first fixes the nut 400 through the hoisting hole 410 and then lifts it out. Then, the double-ended bolt 300 is unscrewed from the turbine via the disassembly assembly 200. Then, the bolt connection assembly 210 is connected to the threaded hole 310 of the double-ended bolt 300. The double-ended bolt 300 is lifted and removed from the turbine by the hoisting mechanism 100. The disassembly is carried out by the hoisting equipment, which reduces the user's use of their own strength to disassemble, greatly improves the installation efficiency, enhances the safety of the disassembly operation, reduces the risk of safety accidents, and also reduces the collision damage to the nut 400 and the double-ended bolt 300 during disassembly.

[0030] Understandably, the nut 400 is a hollow cylinder that fits onto the double-ended bolt 300, which has threads at both ends.

[0031] Figure 3 and Figure 4 The disassembly assembly 200, as shown in one embodiment, may include a mounting hole 204 for engaging with a stud bolt 300. The diameter of the mounting hole 204 near the stud bolt 300 is larger than the outer diameter of the stud bolt 300. The cross-sectional area of ​​the mounting hole 204 gradually decreases from the end near the stud bolt 300 to the other end away from the stud bolt 300. The other end of the mounting hole 204 is press-fitted with the stud bolt 300. The press-fitted mounting hole 204 can fasten the stud bolt 300 within the disassembly assembly 200. When the disassembly assembly 200 is twisted, it will cause the stud bolt 300 to rotate, thereby causing the stud bolt 300 to unscrew from the threaded hole 310.

[0032] In one specific embodiment, the inner wall of the mounting hole 204 is made of an elastic material that will not damage the threads of the double-ended bolt 300.

[0033] Figure 3 and Figure 4 In one embodiment, the disassembly assembly 200 may include a boss 201 at one end of the disassembly assembly 200 away from the mounting hole 204, which facilitates wrench engagement. The boss 201 allows the user to use a wrench or other tools to twist the disassembly assembly 200.

[0034] In one specific embodiment, the boss 201 is a regular hexagon, which conforms to the shape of a wrench, making it easy to attach a wrench to the boss 201.

[0035] Figure 3 and Figure 4 The disassembly assembly 200, as shown in one embodiment, may include an elastic inner cover 203 and an outer cover 202 that fits over the inner cover 203. A boss 201 is provided on the outer cover 202, and a mounting hole 204 is provided inside the inner cover 203. An interference fit between the inner cover 203 and the double-ended bolt 300 causes the inner cover 203 to expand outward. An interference fit is formed between the inner cover 203 and the outer cover 202. When the boss 201 on the outer cover 202 is twisted, the outer cover 202 will drive the inner cover 203 to rotate. When the inner cover 203 wears out, only the inner cover 203 needs to be replaced without replacing the outer cover 202, thus reducing maintenance costs.

[0036] Figure 3 and Figure 4 In one embodiment, the mounting hole 204 may include a plurality of wedges 205 disposed around the inner wall of the mounting hole 204 at the end of the mounting hole 204 away from the double-ended bolt 300. The wedges 205 protrude toward the double-ended bolt 300 and are interference-fitted with the double-ended bolt 300. When the outer cover 202 rotates, the outer cover 202 and the inner cover 203 move relative to each other. Due to the interference fit between the inner cover 203 and the outer cover 202, the outer cover 202 drives the inner cover 203 to rotate. The outward convex corner of the wedge 205 extrusion block forms a misaligned extrusion, causing the wedge 205 extrusion block to undergo a slight deformation, accompanied by an axial extrusion force. This extrusion force causes the cylindrical surface of the wedge 205 extrusion block to generate a large frictional force with the cylindrical surface of the double-ended bolt 300, thereby driving the double-ended bolt 300 to rotate.

[0037] In one specific embodiment, the inner cover 203 is made of polyurethane. Polyurethane is highly elastic and has low hardness, so it will not scratch the threads of the double-ended bolt 300.

[0038] Figure 1 and Figure 5The lifting mechanism 100, as shown in one embodiment, may include a hanger 110 and a plurality of slings 120 linearly arranged on the hanger 110. The slings 120 are connected to bolt connection assembly 210 or to nut connection assembly 500. The hanger 110 is connected to a crane. The hanger 110 lifts and transports the nut 400 and double-ended bolt 300 via the slings 120.

[0039] In one specific embodiment, the hanger 110 has several hollowed-out sections inside to reduce the overall weight of the hanger 110.

[0040] In one specific embodiment, the sling 120 is a steel cable.

[0041] Figure 2 The bolt connection assembly 210, as shown in one embodiment, may include a lifting bolt head 211 and a pin 213 connected to a threaded hole 310. One end of the lifting bolt head 211 has an external thread matching the threaded hole 310, and the other end has a through hole 212 penetrating the lifting bolt head 211. The pin 213 passes through the through hole 212. One end of the pin 213 has a stop portion 214 with a diameter larger than the through hole 212, and the other end of the pin 213 has an outwardly extending portion... The prominent elastic ball head snap fastener 215, the lifting mechanism 100 connecting pin 213, the lifting bolt head 211 is connected and fixed to the threaded hole 310 of the central axis of the double-ended bolt 300, the pin 213 is inserted into the through hole 212, and the sling 120 is tied to the pin 213 to lift the double-ended bolt 300. The cut-off parts 214 at both ends of the pin 213 and the elastic ball head snap fastener 215 can prevent the sling 120 from coming out of the pin 213.

[0042] Figures 5 to 7This invention illustrates a nut-connecting tool according to one embodiment of the present invention, which may include a first jaw 510, a second jaw 520, and a locking ring 530. One end of the first jaw 510 is rotatably connected to one end of the second jaw 520. The end of the first jaw 510 away from the rotatable connection has an outwardly protruding first engaging portion 511. The second jaw 520 is mirror-image of the first jaw 510 with a second engaging portion 521. The middle part of the first jaw 510 is bent into an arc in the direction of the protrusion of the first engaging portion 511, and the second jaw 520 is bent into an arc in the direction of the protrusion of the second engaging portion 521. The locking ring 530 connects the first jaw 510 and the second jaw 520. The two grippers 520 are movably engaged. When the locking ring 530 is lifted, the first gripper 510 and the second gripper 520 are offset from each other, and the second gripper 520 moves towards the first gripper 510. The first engaging part 511 and the second engaging part 521 move in mirror image, with the first engaging part 511 extending towards the second engaging part 521, and the first engaging part 511 and the second engaging part 521 overlapping each other. When the locking ring 530 is lowered, the first gripper 510 and the second gripper 520 overlap each other, and the first engaging part 511 and the second engaging part 521 extend in opposite directions, and the first engaging part 511 and the second engaging part 521 do not overlap.

[0043] Understandably, when the locking ring 530 is lifted, the middle parts of the first jaw 510 and the second jaw 520 overlap under the action of the locking ring 530, causing the first locking part 511 and the second locking part 521 to overlap. The first locking part 511 and the second locking part 521 can be inserted into the nut 400. When the first jaw 510 and the second jaw 520 move down to a specified distance, and then the locking ring 530 is lowered, the first locking part 511 and the second locking part 521 extend in opposite directions to form an inverted T shape, hooking the nut 400. Through the fixed connection at the rotating connection by the sling 120, the hanger 110 can lift the nut connection assembly through the sling 120, thereby lifting the nut 400.

[0044] Figures 5 to 7 The locking ring 530 is shown in one embodiment. The locking ring 530 may include a sliding hole that matches the cross-sectional shape of the first gripper 510 and the second gripper 520. The sliding hole of the locking ring 530 has the same area as the first gripper 510 and the second gripper 520, so that the first gripper 510 and the second gripper 520 can overlap together in the sliding hole.

[0045] Figure 8This illustration shows a protective sleeve for a double-ended bolt 300 according to one embodiment of the present invention. It may include a hook and loop fastener base surface 600 that completely encloses the outer circular sidewall of the double-ended bolt 300, and hook and loop fastener straps 610 disposed on the base surface 600. One end of the hook and loop fastener strap 610 is disposed on the base surface 600, and the other end is freely bent and pasted to any location on the base surface 600. The base surface 600 encloses the double-ended bolt 300 to prevent damage to the threads. The hook and loop fastener straps 610 connect from one end of the cylindrical base surface 600 to the other end, forming a strap structure. The hook and loop fastener straps 610 overlap above the double-ended bolt 300, fixing the base surface 600 to the double-ended bolt 300.

[0046] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A tool for disassembling and assembling a hot-tightened double-ended bolt and nut for a steam turbine, wherein the double-ended bolt (300) has a threaded hole (310) at its central axis, and the nut (400) has a lifting hole (410) at its central axis, characterized in that, include: A lifting mechanism (100) for lifting nuts (400) and stud bolts (300), a nut connecting assembly (500) for connecting and fixing nuts (400) through the lifting hole (410) and connecting to the lifting mechanism (100), a disassembly assembly (200) for sleeved on the upper end of stud bolts (300) and removing stud bolts (300), and a bolt connecting assembly (210) for connecting to the threaded hole (310) of stud bolts (300) and connecting to the lifting mechanism (100); The hoisting mechanism (100) and the nut (400) connecting assembly constitute a nut (400) hoisting system for hoisting the nut (400), and the hoisting mechanism (100), the disassembly assembly (200) and the bolt connection assembly (210) constitute a bolt hoisting and disassembly system for disassembling and hoisting the double-ended bolt (300).

2. The tool for disassembling and assembling hot-tightened double-ended bolts and nuts for steam turbines according to claim 1, characterized in that, The disassembly assembly (200) is provided with a mounting hole (204) for engaging with a stud bolt (300). The diameter of the mounting hole (204) near the stud bolt (300) is larger than the outer diameter of the stud bolt (300). The cross-sectional area of ​​the mounting hole (204) gradually decreases from the end near the stud bolt (300) to the other end away from the stud bolt (300). The other end of the mounting hole (204) is interference-fitted with the stud bolt (300).

3. The tool for disassembling and assembling hot-tightening double-ended bolts and nuts for steam turbines according to claim 2, characterized in that, The disassembly assembly (200) has a boss (201) at one end away from the mounting hole (204) to facilitate wrench engagement.

4. The tool for disassembling and assembling hot-tightened double-ended bolts and nuts for steam turbines according to claim 3, characterized in that, The disassembly assembly (200) includes an elastic inner cover (203) and an outer cover (202) that fits over the inner cover (203), the boss (201) is disposed on the outer cover (202), and the mounting hole (204) is disposed inside the inner cover (203).

5. The tool for disassembling and assembling hot-tightened double-ended bolts and nuts for steam turbines according to claim 4, characterized in that, The mounting hole (204) is provided with a plurality of wedges (205) at one end away from the double-ended bolt (300), which are arranged around the inner wall of the mounting hole (204). The wedges (205) protrude toward the double-ended bolt (300) and are interference-fitted with the double-ended bolt (300).

6. The tool for disassembling and assembling hot-tightened double-ended bolts and nuts for steam turbines according to claim 1, characterized in that, The hoisting mechanism (100) includes a hanger (110) and a plurality of slings (120) arranged linearly on the hanger (110), wherein the slings (120) are connected to the bolt connection assembly (210) or the slings (120) are connected to the nut (400) connection assembly.

7. The tool for disassembling and assembling hot-tightened double-ended bolts and nuts for steam turbines according to claim 1, characterized in that, The bolt connection assembly (210) includes a lifting bolt head (211) and a pin (213) connected to a threaded hole (310). One end of the lifting bolt head (211) is provided with an external thread that matches the threaded hole (310), and the other end is provided with a through hole (212) that penetrates the lifting bolt head (211). The pin (213) is inserted into the through hole (212). One end of the pin (213) is provided with a stop portion (214) with a diameter larger than that of the through hole (212), and the other end of the pin (213) is provided with an outwardly protruding elastic ball head snap-fit ​​(215). The lifting mechanism (100) is connected to the pin (213).

8. The tool for disassembling and assembling hot-tightened double-ended bolts and nuts for steam turbines according to claim 1, characterized in that, include: After the double-ended bolt is hoisted, a double-ended bolt protective sleeve is also provided at the double-ended bolt (300). The double-ended bolt protective sleeve can completely wrap the hook and loop fastener base surface (600) and the hook and loop fastener sling (610) set on the hook and loop fastener base surface (600) of the outer circular side wall of the double-ended bolt (300). One end of the hook and loop fastener sling (610) is set on the hook and loop fastener base surface (600), and the other end can be freely bent and pasted to any place on the hook and loop fastener base surface (600).

9. A nut-connecting tool, applied to the turbine hot-tightening double-ended bolt and nut assembly / disassembly tool as described in any one of claims 1-8, characterized in that, include: The first gripper (510), the second gripper (520), and the locking ring (530) are configured such that one end of the first gripper (510) is rotatably connected to one end of the second gripper (520), and the end of the first gripper (510) away from the rotatable connection is provided with a first latching portion (511) protruding outward. The second gripper (520) is provided with a second latching portion (521) mirror image of the first gripper (510). The middle part of the first gripper (510) is bent into an arc in the direction of the protrusion of the first latching portion (511), and the second gripper (520) is bent into an arc in the direction of the protrusion of the second latching portion (521). The locking ring (530) movably engages the first gripper (510) and the second gripper (520).

10. A nut-connecting tool according to claim 9, characterized in that, The locking ring (530) is provided with a sliding hole, which matches the cross-sectional shape of the first gripper (510) and the second gripper (520).

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