Special tool for quickly disassembling and assembling stud of top cover of water turbine

Abstract

The utility model discloses a special tool for quickly disassembling and assembling a stud of a top cover of a water turbine, the special tool for quickly disassembling and assembling the stud of the top cover of the water turbine comprises a switching sleeve and a locking sleeve which are connected, the switching sleeve comprises a knob section and a switching section, the boundary dimension of the knob section is matched with that of a sleeve of a pneumatic or electric wrench, and the locking sleeve is connected with the switching section. The adapter section is provided with an assembly hole, the shape and the size of the assembly hole are matched with those of a boss on a top cover stud, the adapter section is sleeved with the locking sleeve, the inner circumferential wall of the locking sleeve is provided with an internal thread, and the internal thread is matched with an upper thread of the top cover stud, so that the adapter section is in threaded connection with the top cover stud through the locking sleeve. According to the special tool for quickly disassembling and assembling the stud of the top cover of the water turbine, the disassembling and assembling efficiency and safety of the stud of the top cover of the water turbine are improved, and the overhaul quality and operation reliability of a water-turbine generator set are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of water turbine, especially to a special tool for quick dismounting of water turbine top cover double-end bolt. BACKGROUND

[0002] The water turbine top cover bolt is a key component in the assembly of the water turbine generator unit, and its strength checking and assembly quality play a vital role in the reliable operation of the water turbine generator unit. During the overhaul of the unit, dismounting and mounting of all the top cover bolts are essential work links. However, the current dismounting and mounting of the top cover bolts of large and medium-sized hydroelectric units faces many problems, such as poor adaptability of the dismounting and mounting tools, difficulty in manual dismounting and mounting, inconvenience in hoisting and carrying the bolts, etc., which seriously affect the operation efficiency and safety. The dismounting and mounting efficiency of the water turbine top cover bolt is a key factor affecting the linear period of unit overhaul. The current dismounting and mounting method is not only inefficient and labor-intensive, but also has many safety hazards and quality risks. SUMMARY

[0003] The utility model is made based on the inventor's discovery and understanding of the following facts and problems:

[0004] The top cover bolts of large and medium-sized hydroelectric units have the characteristics of large number, special structure and large size. The existing sleeve tools cannot match these special top cover bolts, making it difficult to use pneumatic wrenches or electric wrenches for efficient dismounting and mounting operation. Currently, only traditional open-end wrenches and impact wrenches can be used for manual operation.

[0005] Due to long-term operation of the unit, the top cover bolts may rust, which greatly increases the resistance during dismounting and mounting. At the same time, due to the limitation of the installation position, only smaller tools can be selected in actual operation. The force arm of the smaller tools is shorter, and it is difficult to generate enough torque required for bolt removal. To solve this problem, a larger size hex nut is usually welded on the top of the bolt, and then a larger size open-end wrench can be used for dismounting and mounting.

[0006] The operation of welding a hex nut on the top of the bolt not only has a large workload, but also requires high safety protection measures for the operation site. Because there are usually many oil pipes arranged at the operation site, there is a risk of fire and other safety accidents during the welding process. In addition, the welding operation will have a thermal effect on the bolt body, which may change the performance of the bolt material, damage the bolt thread, and affect the service life of the bolt and the assembly quality of the unit.

[0007] No lifting hole is provided on the water turbine top cover bolt, and only single-handed operation can be relied on during carrying. However, these bolts are heavy, and there are usually a lot of oil stains at the operation site, making the ground wet and slippery, so that the lifting and carrying of the bolts not only have a high safety risk, but also are inefficient.

[0008] The utility model aims at solving one of the technical problems in the related art at least to some extent.

[0009] Therefore, the utility model discloses an embodiment proposes a special tool for quick dismounting of the double-end bolt of the top cover of the hydraulic turbine, improves the dismounting efficiency and safety of the bolt of the top cover of the hydraulic turbine, and guarantees the maintenance quality and operation reliability of the hydraulic generator set.

[0010] The special tool for quick dismounting of the double-end bolt of the top cover of the hydraulic turbine in the utility model embodiment comprises an adapter sleeve and a locking sleeve, the adapter sleeve comprises a rotation and torsion section and an adapter section, the outer dimension of the rotation and torsion section is matched with the sleeve of a pneumatic or electric wrench, the rotation and torsion section is connected with the adapter section, an assembly hole is arranged on the adapter section, the shape and size of the assembly hole are matched with the boss on the double-end bolt of the top cover, the locking sleeve is sleeved on the adapter section, an internal thread is arranged on the inner circumferential wall of the locking sleeve, the internal thread is matched with the upper thread of the double-end bolt of the top cover, so that the adapter section is connected with the double-end bolt of the top cover through the locking sleeve.

[0011] In some embodiments, the outer shape of the rotation and torsion section is a regular hexagonal prism, the outer shape of the adapter section is a cylinder, and the central axis of the rotation and torsion section is coaxially arranged with the central axis of the adapter section.

[0012] In some embodiments, the rotation and torsion section and the adapter section are integrally formed.

[0013] In some embodiments, the assembly hole is arranged on the lower end surface of the adapter section, and the depth of the assembly hole is greater than the height of the boss on the double-end bolt of the top cover.

[0014] In some embodiments, an internal thread counterbore is arranged at the center of the upper end surface of the rotation and torsion section, and the internal thread counterbore is used for mounting a lifting ring.

[0015] In some embodiments, the central axis of the locking sleeve is coaxially arranged with the central axis of the adapter section, the locking sleeve has a central through hole, and the lower part of the adapter section is located in the central through hole.

[0016] In some embodiments, the internal thread is located on the hole wall of the lower part of the central through hole.

[0017] In some embodiments, the projection shape of the outer contour of the locking sleeve is a regular hexagon.

[0018] In some embodiments, the adapter section and the locking sleeve can relatively slide, the lower end of the adapter section has an outer convex edge, the upper end of the locking sleeve has an inner convex edge, and the projections of the outer convex edge and the inner convex edge have overlapping parts.

[0019] In some embodiments, the peripheral wall of the outer flange is spaced apart from the hole wall of the central through hole in the inner-outer direction. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic diagram of a special tool for quickly disassembling and assembling the top cover double-headed bolt of a hydraulic turbine according to an embodiment of the present application.

[0021] Reference signs:

[0022] 1 - adapter sleeve, 11 - twist segment, 111 - internally threaded counterbore, 12 - adapter segment, 121 - assembly hole, 122 - outer flange, 2 - locking sleeve, 21 - internal thread, 22 - inner flange, 201 - central through hole, 3 - top cover double-headed bolt, 31 - boss. DETAILED DESCRIPTION

[0023] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0024] The special tool for quickly disassembling and assembling the top cover double-headed bolt 3 of a hydraulic turbine according to an embodiment of the present application is described below in conjunction with the drawings.

[0025] As shown in Figure 1 , the special tool for quickly disassembling and assembling the top cover double-headed bolt 3 of a hydraulic turbine according to an embodiment of the present application includes an adapter sleeve 1 and a locking sleeve 2.

[0026] The adapter sleeve 1 includes an upper twist segment 11 and a lower adapter segment 12, and the twist segment 11 and the adapter segment 12 can be integrally formed by mold pouring to eliminate the weak points of welding or assembly interfaces and ensure that the tool does not deform or break under repeated stress.

[0027] The twist segment 11 has an outer size matching the sleeve of a pneumatic or electric wrench, and the twist segment 11 has a regular hexagonal prism shape, such as a hexagonal head of M56, with a height of 40 mm, and is compatible with the sleeve of a mainstream pneumatic or electric wrench M56, eliminating size mismatch between the tool and the bolt.

[0028] The adapter segment 12 is provided with an assembly hole 121, and the shape and size of the assembly hole 121 match the boss 31 on the top cover double-headed bolt 3, such as a linear type or a rectangular type, and precise clamping is achieved through customized design.

[0029] The locking sleeve 2 is sleeved on the adapter segment 12, and the inner peripheral wall of the locking sleeve 2 is provided with an internal thread 21 matching the upper thread of the top cover double-headed bolt 3, so that the adapter segment 12 is connected with the top cover double-headed bolt 3 through the locking sleeve 2, forming a rigid connection to prevent the tool from being separated under impact load.

[0030] Therefore, in the embodiment of the utility model, the torque of the pneumatic or electric wrench is transmitted to the top cover stud bolt 3 through the adapter sleeve 1, the problem that the sleeve of the pneumatic or electric wrench and the boss 31 on the top of the top cover stud bolt are not matched and cannot be forced is solved, and the disassembly and assembly efficiency of the top cover stud bolt 3 is significantly improved. Moreover, the adapter sleeve 1 is firmly fixed on the top cover stud bolt 3 through the locking sleeve 2, tool failure under high-speed impact is avoided, and operation safety is ensured.

[0031] In addition, the special tool of the embodiment of the utility model is made of chromium-molybdenum steel material, and the impact resistance of the tool is improved through high hardness and high wear resistance material, and the high-strength disassembly and assembly scene is adapted.

[0032] In some embodiments, as shown in Figure 1 The outer shape of the adapter section 12 is a cylinder, the central axis of the torque section 11, the central axis of the adapter section 12 and the central axis of the locking sleeve 2 are coaxially arranged, the locking sleeve 2 has a central through hole 201, and the lower part of the adapter section 12 is located in the central through hole 201.

[0033] It can be understood that the axes of the three are coincident, ensuring that there is no eccentric moment in the process of transmitting torque from the wrench to the boss 31 of the top cover stud bolt 3, avoiding tool vibration, bolt head wear or thread seizure caused by eccentricity. Therefore, the coaxial design makes the load uniformly transmitted along the center line of the tool, reduces local stress concentration, and prolongs the service life of the tool.

[0034] In some embodiments, as shown in Figure 1 The assembly hole 121 is arranged at the lower end face of the adapter section 12, and the depth of the assembly hole 121 is greater than the height of the boss 31 on the top cover stud bolt 3.

[0035] For example, the projection of the assembly hole 121 is rectangular, the length of the assembly hole 121 is 50mm, the width is 30mm, and the depth is 30mm. The assembly hole 121 completely covers the boss 31 on the top cover stud bolt 3, and the depth redundancy design provides an axial allowance for the tool and the top cover stud bolt 3. Even under high-frequency impact or vibration working conditions, the boss 31 can still be stably clamped in the assembly hole 121, preventing the tool from slipping due to instantaneous load deviation.

[0036] In some embodiments, as shown in Figure 1 The inner thread counterbore 111 is arranged at the center of the upper end face of the torque section 11, and the inner thread counterbore 111 is used for installing a lifting ring.

[0037] It can be understood that, after the top cover stud bolt 3 is removed, the bolt lifting is directly completed by rotating a standard lifting ring (such as M14 specification) without replacing tools or additional fixing devices, thereby solving the problem of inconvenient lifting and carrying of the existing bolt.

[0038] In some embodiments, as shown in Figure 1 The internal thread 21 is located on the hole wall of the lower part of the center through hole 201, so that the locking sleeve 2 is directly screwed on the upper bolt of the top cover stud bolt 3.

[0039] Optionally, the projection shape of the outer contour of the locking sleeve 2 is a regular hexagon, which facilitates the application of a tightening torque by using an auxiliary tool (such as a wrench), thereby enhancing the locking reliability.

[0040] In some embodiments, as shown in Figure 1 The adapter section 12 and the locking sleeve 2 are relatively slidable, the lower end of the adapter section 12 has an outer convex edge 122, the upper end of the locking sleeve 2 has an inner convex edge 22, and the projections of the outer convex edge 122 and the inner convex edge 22 have overlapping parts.

[0041] It can be understood that the overlapping projections of the outer convex edge 122 and the inner convex edge 22 form a "mechanical stop", so that even if the tool is not completely locked or is vibrated, the locking sleeve 2 is still limited on the adapter section 12, thereby avoiding the risk of falling of tool parts in high-altitude operation.

[0042] Further, as shown in Figure 1 The circumferential wall of the outer convex edge 122 and the hole wall of the center through hole 201 are spaced apart in the inner and outer directions, and have a sliding gap therebetween, thereby avoiding rigid friction between the adapter section 12 and the locking sleeve 2, and ensuring smooth screwing.

[0043] In summary, the utility model discloses a cooperative design of an adapter sleeve and a locking sleeve, and takes adaptability structure (hexagonal head, assembly hole), rigid connection (thread locking) and function integration (lifting interface) as the core, thereby systematically solving the problems of poor adaptability, low efficiency and many safety hazards in the disassembly of the top cover stud bolt of the water turbine. Through the detailed design of material, size and connection mode, the reliability, universality and operation convenience of the tool are further strengthened, thereby having significant technical progress and engineering practical value.

[0044] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0045] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0046] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication or interaction relationship of two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0047] In the utility model, unless otherwise specifically defined and limited, the first feature "on" or "under" the second feature can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0048] In the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that the specific feature, structure, material or characteristic being described with reference to the embodiment or example is included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the features of different embodiments or examples described in the specification and the features of different embodiments or examples without contradiction.

[0049] Although the above embodiments have been shown and described, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and the changes, modifications, replacements and modifications of the above embodiments made by the person skilled in the art are within the protection scope of the present application.

Claims

1. A special tool for quick disassembly and assembly of double-ended bolts on the top cover of a water turbine, characterized in that, The device includes an adapter sleeve and a locking sleeve. The adapter sleeve comprises a knob section and an adapter section. The external dimensions of the knob section match the socket of a pneumatic or electric wrench. The knob section is connected to the adapter section. The adapter section has a mounting hole, the shape and size of which match the boss on the top cover double-ended bolt. The locking sleeve is fitted onto the adapter section. The inner circumferential wall of the locking sleeve has an internal thread, which matches the upper thread of the top cover double-ended bolt, so that the adapter section is threadedly connected to the top cover double-ended bolt through the locking sleeve.

2. The special tool for quick disassembly and assembly of double-ended bolts on the turbine top cover according to claim 1, characterized in that, The torsion section is shaped like a regular hexagonal prism, the transition section is shaped like a cylinder, and the central axis of the torsion section and the central axis of the transition section are coaxial.

3. The special tool for quick disassembly and assembly of double-ended bolts on the turbine top cover according to claim 2, characterized in that, The torsion section and the transition section are integrally formed.

4. The special tool for quick disassembly and assembly of double-ended bolts on the turbine top cover according to claim 2, characterized in that, The assembly hole is located on the lower end face of the transition section, and the depth of the assembly hole is greater than the height of the boss on the double-ended bolt of the top cover.

5. The special tool for quick disassembly and assembly of double-ended bolts on the turbine top cover according to claim 4, characterized in that, The upper end face of the torsion section is provided with an internally threaded countersunk hole, which is used to install a lifting ring.

6. The special tool for quick disassembly and assembly of double-ended bolts on the turbine top cover according to any one of claims 2-5, characterized in that, The central axis of the locking sleeve is coaxial with the central axis of the adapter section, the locking sleeve has a central through hole, and the lower part of the adapter section is located in the central through hole.

7. The special tool for quick disassembly and assembly of double-ended bolts on the turbine top cover according to claim 6, characterized in that, The internal thread is located on the lower part of the hole wall of the central through hole.

8. The special tool for quick disassembly and assembly of double-ended bolts on the turbine top cover according to claim 6, characterized in that, The projected shape of the outer contour of the locking sleeve is a regular hexagon.

9. The special tool for quick disassembly and assembly of double-ended bolts on the turbine top cover according to claim 6, characterized in that, The adapter section and the locking sleeve can slide relative to each other. The lower end of the adapter section has an outer convex edge, and the upper end of the locking sleeve has an inner convex edge. The projections of the outer convex edge and the inner convex edge have overlapping portions.

10. The special tool for quick disassembly and assembly of double-ended bolts on the turbine top cover according to claim 9, characterized in that, The peripheral wall of the outer protrusion is spaced apart from the wall of the central through hole in the inward and outward directions.

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