Lower nut dismounting protection tool

Abstract

The lower nut dismounting protection tool is used for protecting dismounting of a lower nut connected to a steam turbine high-pressure cylinder bolt and comprises a lifting assembly and a supporting assembly, the lifting assembly is connected with the supporting assembly, the steam turbine high-pressure cylinder bolt is provided with a heating hole penetrating the steam turbine high-pressure cylinder bolt in the length direction of the steam turbine high-pressure cylinder bolt, and the lifting assembly is partially arranged in the heating hole in a penetrating mode. The part, located below the heating hole, of the lifting assembly is connected with the supporting assembly, the upper end face of the supporting assembly is used for abutting against the lower end face of the lower nut, and the minimum size of the supporting assembly in the radial direction of the lower nut is larger than the inner diameter of the lower nut. In the process of screwing the lower nut, the upper end face of the supporting assembly can abut against the lower end face of the lower nut by lifting the lifting assembly, and therefore the lower nut screwed down from the steam turbine high-pressure cylinder bolt is supported and protected. And the problem that operators are injured after the lower nut is separated from the steam turbine high-pressure cylinder bolt is avoided.

Description

Technical Field

[0001] The present disclosure relates to the technical field of steam turbine high-pressure cylinder bolt disassembly, and in particular to a lower nut disassembly and protection tool. Background Art

[0002] The horizontal bolts on the high-pressure cylinder of a steam turbine are stud bolts. When disassembling the high-pressure cylinder, the lower nuts of the stud bolts must be removed and then the bolts must be lifted out of the bolt holes using a crane. Due to the large size of the bolts in the high-pressure cylinder of a steam turbine, a single nut weighs approximately 40 kilograms. Furthermore, the space below the bolts is narrow, making it difficult for maintenance workers to exert force. This makes removing and installing the lower nuts difficult and inefficient. Furthermore, there is a risk that the lower nut will detach from the bolt at the moment of removal and installation. The huge impact of the lower nut falling can cause it to slip out of the hands of the operator, potentially causing injury. Utility Model Content

[0003] The purpose of the present invention is to provide a lower nut disassembly protection tool to solve the technical problems existing in the related art.

[0004] To achieve the above-mentioned purpose, the present disclosure provides a lower nut disassembly protection tool for protecting the disassembly of the lower nut connected to the high-pressure cylinder bolt of a steam turbine, comprising a lifting assembly and a support assembly, wherein the lifting assembly is connected to the support assembly, the high-pressure cylinder bolt of the steam turbine has a heating hole passing through along its own length direction, the lifting assembly is partially inserted into the heating hole, the portion of the lifting assembly located below the heating hole is connected to the support assembly, and the upper end surface of the support assembly is used to abut against the lower end surface of the lower nut;

[0005] The minimum dimension of the support assembly in the radial direction of the lower nut is larger than the inner diameter of the lower nut.

[0006] Optionally, the lifting assembly is detachably connected to the supporting assembly.

[0007] Optionally, the lifting assembly includes a lifting handle, a connecting piece and a resisting piece, the connecting piece is connected between the lifting handle and the resisting piece, the connecting piece is passed through the heating hole, the lifting handle is located above the heating hole, and the resisting piece is located below the heating hole and is used to resist the lower end surface of the support assembly.

[0008] Optionally, the abutting member includes a screw and a locking nut, the screw is connected to an end of the connecting member away from the lifting handle, and the locking nut is threadedly connected to the screw.

[0009] Optionally, the connecting member is a steel wire rope.

[0010] Optionally, the lifting assembly further includes a gasket, which is sleeved on the outer periphery of the abutting member and located between the abutting member and the supporting assembly.

[0011] Optionally, the supporting assembly includes a first tray, the first tray is connected to the lifting assembly, and the upper end surface of the first tray is used to interfere with the lower end surface of the lower nut.

[0012] Optionally, the supporting assembly includes a second tray, the second tray is connected to the lifting assembly and is located below the first tray, and the second tray is rotatably connected to the first tray.

[0013] Optionally, a protruding block is formed on the first tray, and a concave groove is formed on the second tray, and the protruding block is rotatably embedded in the concave groove.

[0014] Optionally, the support assembly also includes a bearing, which includes an inner ring, an outer ring and a plurality of balls, each of the balls is connected in a rolling manner between the inner ring and the outer ring, the inner ring is sleeved on the outer periphery of the protruding block, and the outer peripheral surface of the outer ring is connected to the groove wall of the recessed groove.

[0015] Through the above technical solution, before removing the lower nut connected to the protective bolt of the high-pressure cylinder of the turbine, the lifting assembly can be first inserted into the heating hole of the high-pressure cylinder bolt of the turbine. At this time, the part of the lifting assembly located below the heating hole is connected to the support assembly, that is, the support assembly is located below the lower nut. In this way, in the process of screwing the above-mentioned lower nut, by lifting the above-mentioned lifting assembly, the upper end face of the support assembly can be made to collide with the lower end face of the lower nut, thereby supporting and protecting the lower nut screwed off from the high-pressure cylinder bolt of the turbine, and avoiding the problem of the lower nut being detached from the high-pressure cylinder bolt of the turbine and injuring the operator.

[0016] Moreover, due to the protection of the above-mentioned lower nut disassembly protection tooling, the relevant operators do not have to worry about the lower nut suddenly falling off during the process of screwing the lower nut, and there is no need for other personnel to support the lower nut. Therefore, the labor intensity during the disassembly of the lower nut can be reduced, and the disassembly efficiency of the lower nut can be significantly improved.

[0017] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0019] Figure 1 is a cross-sectional view of a lower nut disassembly protection tool provided by an exemplary embodiment of the present disclosure and matched with a high-pressure cylinder bolt of a steam turbine;

[0020] Figure 2 It is a cross-sectional view of a lower nut disassembly protection tool provided by an exemplary embodiment of the present disclosure in a disassembled state.

[0021] Description of Reference Numerals

[0022] 1-Lower nut removal protection tool; 10-Pulling assembly; 11-Pulling handle; 12-Connecting piece; 13-Repelling piece; 131-Screw; 132-Locking nut; 14-Gasket; 20-Support assembly; 21-First tray; 210-Protruding block; 22-Second tray; 220-Recessed groove; 23-Bearing; 231-Inner ring; 232-Outer ring; 233-Ball; 100-Turbine high-pressure cylinder bolt; 101-Heating hole; 200-Lower nut. DETAILED DESCRIPTION

[0023] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0024] In the present disclosure, unless otherwise specified, the directional words such as "up", "down", "left", "right", etc. used to indicate the direction or position relationship are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, and a specific directional structure and operation. Therefore, it cannot be understood as a limitation of the present disclosure. The terms "inside" and "outside" refer to the inside and outside of the corresponding structural contour.

[0025] In addition, the "length direction" can be seen Figure 1 In the longitudinal direction shown. It should be noted that the terms "first," "second," and the like are used to distinguish one element from another and do not have a sequential or important meaning. In the description with reference to the accompanying drawings, the same reference numerals in different drawings represent the same element.

[0026] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified or limited, the terms "disposed," "connected," "connected," and "installed" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; and they may refer to direct connections or indirect connections via an intermediary. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on specific circumstances.

[0027] refer to Figures 1 to 2The present invention provides a lower nut disassembly protection tool for protecting the disassembly of the lower nut 200 connected to the high-pressure cylinder bolt 100 of the turbine, including a pulling component 10 and a support component 20. The pulling component 10 is connected to the support component 20. The high-pressure cylinder bolt 100 of the turbine has a heating hole 101 that passes through it along its own length direction. The pulling component 10 is partially penetrated in the heating hole 101. The part of the lifting component 10 located below the heating hole 101 is connected to the support component 20. The upper end surface of the support component 20 is used to interfere with the lower end surface of the lower nut 200. The minimum dimension of the support component 20 in the radial direction of the lower nut 200 is larger than the inner diameter of the lower nut 200.

[0028] Through the above technical solution, before removing the lower nut 200 connected to the protective turbine high-pressure cylinder bolt 100, the lifting assembly 10 can be first inserted into the heating hole 101 of the turbine high-pressure cylinder bolt 100. At this time, the part of the lifting assembly 10 located below the heating hole 101 is connected to the support assembly 20, that is, the support assembly 20 is located below the lower nut 200. In this way, in the process of screwing the above-mentioned lower nut 200, by lifting the above-mentioned lifting assembly 10, the upper end face of the support assembly 20 can be made to collide with the lower end face of the lower nut 200, thereby supporting and protecting the lower nut 200 that is screwed off from the turbine high-pressure cylinder bolt 100, and avoiding the problem of the lower nut 200 being detached from the turbine high-pressure cylinder bolt 100 and injuring the operator.

[0029] In addition, the minimum radial dimension of the support assembly 20 provided by the present invention in the lower nut 200 is larger than the inner diameter of the lower nut 200. In this way, when the lower nut 200 falls off from the turbine high-pressure cylinder bolt 100 and falls onto the support assembly 20, the support assembly 20 can act as a stopper for the lower nut 200, thereby preventing the lower nut 200 from directly falling over the support assembly 20 to the ground.

[0030] Moreover, due to the protection of the above-mentioned lower nut disassembly protection tooling 1, the relevant operators do not have to worry about the lower nut 200 suddenly falling off during the process of screwing the lower nut 200, and there is no need for other personnel to support the lower nut 200. Therefore, the labor intensity during the disassembly of the lower nut 200 can be reduced, and the disassembly efficiency of the lower nut 200 can be significantly improved.

[0031] It should be noted that in order to make the upper end surface of the support component 20 come into contact with the lower end surface of the lower nut 200, during the process of screwing the lower nut 200, the above-mentioned lifting component 10 can be lifted mechanically, or the lifting component 10 can be lifted manually, and the present disclosure does not impose any restrictions on this.

[0032] In order to facilitate the insertion of the lifting assembly 10 into the heating hole 101, in an exemplary embodiment provided by the present disclosure, the lifting assembly 10 can optionally be detachably connected to the support assembly 20. In this way, before removing the lower nut 200, the support assembly 20 can be removed from the lifting assembly 10, and after the lifting assembly 10 is inserted into the high-pressure cylinder bolt 100 of the steam turbine, the support assembly 20 can be reassembled onto the lifting assembly 10. At this time, the support assembly 20 can play a role in resisting the lower nut 200.

[0033] Alternatively, the lifting component 10 may be connected to the supporting component 20 in a non-detachable manner. When inserting the lifting component 10 into the heating hole 101 , the lifting component 10 may be inserted from the bottom of the heating hole 101 .

[0034] Alternatively, as Figures 1 to 2 As shown, the lifting assembly 10 may include a lifting handle 11, a connecting member 12, and a resisting member 13. The connecting member 12 is connected between the lifting handle 11 and the resisting member 13. The connecting member 12 is disposed in the heating hole 101. The lifting handle 11 is located above the heating hole 101. The resisting member 13 is located below the heating hole 101 and is used to resist the lower end surface of the support assembly 20. In this way, when protecting the lower nut 200, the operator can pull the lifting handle 11 to push the resisting member 13 located below the support assembly 20 against the lower end surface of the support assembly 20, thereby achieving support and protection for the lower nut 200 through the support assembly 20.

[0035] The lifting handle 11 may be in any shape, such as a ring shape or a straight line shape, and the present disclosure does not limit this.

[0036] For the embodiment in which the lifting handle 11 is linear, the length of the linear lifting handle 11 in the radial direction of the heating hole 101 is greater than the inner diameter of the heating hole 101. In this way, the problem of the support assembly 20 and the lifting handle 11 connected to the support assembly 20 passing through the heating hole 101 and falling off from the turbine high-pressure cylinder bolt 100 can be avoided during the falling process of the lower nut 200.

[0037] In an exemplary embodiment provided by the present disclosure, the cross-section of the lifting handle 11 , the connecting member 12 , and the abutting member 13 on a vertical plane may be an I-shape.

[0038] In addition, in order to ensure that the support assembly 20 can always maintain a state of resistance against the lower end surface of the lower nut 200 during the process of screwing and lowering the lower nut 200, the above-mentioned lower nut disassembly protection tooling 1 can also include an elastic member. The elastic member can be sleeved on the connecting member 12 and located between the lifting handle 11 and the turbine high-pressure cylinder bolt 100. During the lowering process of the lower nut 200, the elastic member is compressed by the lifting handle 11 and applies an upward elastic force to the lifting handle 11, so that the support assembly 20 can always maintain a state of resistance against the lower end surface of the lower nut 200, thereby providing better protection for the lower nut 200.

[0039] In an exemplary embodiment provided by the present disclosure, Figures 1 to 2 As shown, the abutment member 13 may include a screw 131 and a locking nut 132. The screw 131 is connected to the end of the connecting member 12 facing away from the lifting handle 11, and the locking nut 132 is threadedly connected to the screw 131. In this way, the support assembly 20 can be assembled by screwing the locking nut 132 to remove it from the screw 131. This has the advantages of a simple structure and easy operation, and it is more convenient for operators to quickly remove the lower nut 200.

[0040] Alternatively, in another exemplary embodiment provided by the present disclosure, the above-mentioned push-up member 13 may also include a mounting rod and a support rod, and a mounting hole is formed on the mounting rod, and the support rod is clamped in the mounting hole. When the support assembly 20 needs to be disassembled, the support tube can be pulled out from the mounting hole of the mounting rod. When the lower nut 200 needs to be protected, the support rod can be clamped in the mounting hole. At this time, the support rod can support and push up the support assembly 20 from below.

[0041] In the present disclosure, the connecting member 12 is a steel wire rope. On the one hand, the steel wire rope has high strength and can meet the support requirements of the support assembly 20. On the other hand, the steel wire rope can be bent and deformed, so it can adapt to the assembly environment where the disassembly space of the high-pressure cylinder bolt 100 of the steam turbine is small.

[0042] Alternatively, the connecting member 12 may also be a cable that can meet the load-bearing requirements. The present disclosure does not limit the specific material of the connecting member 12 .

[0043] Alternatively, as Figures 1 to 2 As shown, the lifting assembly 10 may further include a gasket 14, which is sleeved around the outer periphery of the abutment 13 and located between the abutment 13 and the support assembly 20. The gasket 14 connected between the abutment 13 and the support assembly 20 can prevent direct contact between the support assembly 20 and the abutment 13. On the one hand, the gasket 14 can absorb the energy and abnormal sound generated when the two contact each other, and on the other hand, it can prevent damage to the support assembly 20 and / or the abutment 13 due to collision.

[0044] In an exemplary embodiment provided by the present disclosure, Figures 1 to 2 As shown, the support assembly 20 may include a first tray 21, which is connected to the lifting assembly 10. The upper end surface of the first tray 21 is configured to contact the lower end surface of the lower nut 200. In other words, the first tray 21 can support and stop the lower nut 200. Moreover, the first tray 21 has a relatively flat upper surface, thereby providing a larger contact area when contacting the lower nut 200, thereby improving stability during the process of abutting the lower nut 200.

[0045] like Figures 1 to 2 As shown, the support assembly 20 may optionally further include a second tray 22, which is connected to the lifting assembly 10 and located below the first tray 21. The second tray 22 is rotatably connected to the first tray 21. Therefore, when the lower nut 200 contacts and rotates with the first tray 21, the lower nut 200 can drive the synchronous rotation of the first tray 21 while the second tray 22 does not rotate. This prevents the entire support assembly 20 from rotating with the lower nut 200, causing the lifting assembly 10 to twist, thereby causing deformation or even breakage of the lifting assembly 10.

[0046] Alternatively, as Figures 1 to 2 As shown, a protrusion 210 is formed on the first tray 21, and a recessed groove 220 is formed on the second tray 22. The protrusion 210 is rotatably embedded in the recessed groove 220. In other words, the connection between the first tray 21 and the second tray 22 is located within the recessed groove 220. This prevents items from becoming entangled during the rotation of the first tray 21 relative to the second tray 22, thereby reducing safety hazards during operation.

[0047] In an exemplary embodiment provided by the present disclosure, Figures 1 to 2 As shown, the support assembly 20 may further include a bearing 23, which includes an inner ring 231, an outer ring 232, and a plurality of balls 233. Each ball 233 is rollingly connected between the inner ring 231 and the outer ring 232. The inner ring 231 is sleeved on the outer circumference of the protruding block 210, and the outer circumferential surface of the outer ring 232 is connected to the groove wall of the recessed groove 220. In this way, when the first tray 21 rotates with the lower nut 200, the inner ring 231 connected to the first tray 21 can rotate synchronously with the first tray 21. Due to the presence of the plurality of balls 233 between the inner ring 231 and the outer ring 232, the rotation of the first tray 21 does not cause the rotation of the second tray 22. In addition, the plurality of balls 233 can reduce the friction during the rotation of the first tray 21 relative to the second tray 22, making the screwing of the lower nut 200 more labor-saving.

[0048] Alternatively, in another embodiment provided by the present disclosure, the support assembly 20 may further include a rotating shaft, with both ends of the rotating shaft respectively connected to the first tray 21 and the second tray 22, thereby achieving a rotating connection between the first tray 21 and the second tray 22.

[0049] In short, as long as the first tray 21 and the second tray 22 can be rotatably connected, the present disclosure does not limit the rotation structure and rotation method used to achieve the rotatable connection between the first tray 21 and the second tray 22.

[0050] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0051] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0052] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A lower nut disassembly protection tool, used to protect the disassembly of the lower nut connected to the high-pressure cylinder bolt of a steam turbine, characterized in that: The lifting assembly comprises a lifting component and a supporting component, wherein the lifting component is connected to the supporting component, the high-pressure cylinder bolt of the steam turbine has a heating hole extending along its length, the lifting component is partially inserted into the heating hole, the portion of the lifting component located below the heating hole is connected to the supporting component, and the upper end surface of the supporting component is used to abut against the lower end surface of the lower nut; The minimum dimension of the support assembly in the radial direction of the lower nut is larger than the inner diameter of the lower nut.

2. The lower nut disassembly protection tool according to claim 1, characterized in that: The lifting assembly is detachably connected to the supporting assembly.

3. The lower nut disassembly protection tool according to claim 2, characterized in that: The lifting assembly includes a lifting handle, a connecting piece and a resisting piece. The connecting piece is connected between the lifting handle and the resisting piece. The connecting piece is passed through the heating hole. The lifting handle is located above the heating hole. The resisting piece is located below the heating hole and is used to resist the lower end surface of the support assembly.

4. The lower nut disassembly protection tool according to claim 3, characterized in that: The abutting member includes a screw rod and a locking nut. The screw rod is connected to an end of the connecting member away from the lifting handle, and the locking nut is threadedly connected to the screw rod.

5. The lower nut disassembly protection tool according to claim 3, characterized in that: The connecting piece is a steel wire rope.

6. The lower nut disassembly protection tool according to claim 3, characterized in that: The lifting assembly further includes a gasket, which is sleeved on the outer periphery of the abutting member and located between the abutting member and the supporting assembly.

7. The lower nut disassembly protection tool according to any one of claims 1 to 6, characterized in that: The supporting assembly includes a first tray connected to the lifting assembly, and the upper end surface of the first tray is used to abut against the lower end surface of the lower nut.

8. The lower nut disassembly and protection tool according to claim 7, characterized in that: The supporting assembly includes a second tray, the second tray is connected to the lifting assembly and is located below the first tray, and the second tray is rotatably connected to the first tray.

9. The lower nut disassembly protection tool according to claim 8, characterized in that: A protruding block is formed on the first tray, and a concave groove is formed on the second tray. The protruding block is rotatably embedded in the concave groove.

10. The lower nut disassembly protection tool according to claim 9, characterized in that: The support assembly also includes a bearing, which includes an inner ring, an outer ring and a plurality of balls. Each ball is connected in a rolling manner between the inner ring and the outer ring. The inner ring is sleeved on the outer periphery of the protruding block, and the outer peripheral surface of the outer ring is connected to the groove wall of the recessed groove.

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