A special tool for separating and connecting the main shaft of a hydraulic turbine unit

Abstract

The utility model relates to a special tool suitable for water turbine unit main shaft separation and connection, include: double -end screw rod, pass through the axle hole arrangement of upper flange and lower flan, first waist -shaped board, the upper surface of upper flange is arranged and is opened to have the first connecting hole of double -end screw rod upper end passes through, first nut, connect in double -end screw rod's upper end and lock first waist -shaped board on upper flange, second waist -shaped board, be close to the lower end arrangement of double -end screw rod and open to have the second connecting hole of double -end screw rod lower end passes through, second nut, connect in double -end screw rod's lower end, be used for locking second waist -shaped board at double -end screw rod lower end, drive piece, the mounting space for installing drive piece is formed between second waist -shaped board and lower flan, drive piece can be telescopically arranged in this mounting space, drive piece stretches upward for pushing lower flan to upper flan direction, drive piece contracts downward for cancelling the force exerted on lower flan.

Description

Technical Field

[0001] This utility model relates to a special tool for separating and connecting the main shaft of a water turbine unit. Background Technology

[0002] Pumped storage power stations have large energy storage capacity and high storage and release efficiency. Pump turbines, as a new type of pumped storage unit, have wide applications.

[0003] The main shaft of a water pump turbine typically consists of a turbine shaft, an intermediate shaft, and a generator shaft. The lower part of the intermediate shaft connects to the turbine shaft, and the upper part connects to the generator shaft. During unit maintenance, the intermediate shaft needs to be disassembled. However, due to the presence of stop joints at the connections between the intermediate shaft and the generator shaft, and between the intermediate shaft and the turbine shaft, separation of the two shafts is difficult if there is a force deviation in the circumferential direction. Furthermore, the presence of a corundum coating on the connection surfaces of the two shafts further complicates disassembly. Similarly, during shaft reassembly, there must be no force deviation in the circumferential direction, and the connection surfaces must be perfectly parallel for successful installation. The shafts are heavy, and their circumference is secured with several bolts, but operating multiple bolts simultaneously is difficult, leading to challenging reassembly and low operational efficiency.

[0004] Therefore, it is particularly necessary to provide a special tool that facilitates the separation and connection of the main shaft of the turbine unit. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a special tool for the separation and connection of the main shaft of a water turbine unit, which is easy to operate and can effectively improve the efficiency of the separation and connection of the main shaft of the water turbine unit.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: A special tool for separating and connecting the main shaft of a hydro turbine unit, wherein the main shaft of the hydro turbine unit includes a first shaft and a second shaft joined vertically, the lower end of the first shaft is provided with a lower flange, and the upper end of the second shaft is provided with an upper flange. The upper and lower flanges are provided with a plurality of circumferentially arranged shaft holes, through which bolts pass to lock the upper and lower flanges together. The special tool includes: A double-ended screw is arranged to pass through the shaft holes of the upper and lower flanges; The first waist-shaped plate is placed on the upper surface of the upper flange and has a first connecting hole for the upper end of the double-ended screw to pass through; The first nut is connected to the upper end of the double-ended screw and locks the first waist-shaped plate onto the upper flange; The second waist-shaped plate is arranged near the lower end of the double-ended screw and has a second connecting hole through which the lower end of the double-ended screw passes; The second nut is connected to the lower end of the double-ended screw and is used to lock the second waist-shaped plate at the lower end of the double-ended screw. The driving component has an installation space between the second waist-shaped plate and the lower flange for mounting the driving component. The driving component is telescopically disposed in the installation space. The driving component extends upward to push the lower flange towards the upper flange, and retracts downward to cancel the force applied to the lower flange.

[0007] When the second shaft needs to be removed, install two sets of special tools symmetrically on the circumference of the main shaft, allowing the drive component to extend and press the lower flange against the upper flange. Remove the bolts around the circumference of the upper and lower flanges, and then retract the drive component. At this point, under the constraint of the two special tools, the second shaft can fall precisely along the axial direction, avoiding the problem of jamming at the stop and making it difficult to separate the first and second shafts. When the first and second shafts need to be joined, first align the upper and lower flanges and the stop, and then install two sets of special tools symmetrically on the circumference of the upper and lower flanges. The drive component is extended symmetrically from both sides of the upper and lower flanges, so that the two shafts can always maintain precise alignment during the joining process, avoiding the problem of the stop offset making it difficult to join. After the shafts are joined, install the bolts.

[0008] Preferably, the special tools are in two sets and are symmetrically installed on the upper and lower flanges circumferentially during use. Installing the two sets of special tools symmetrically on the upper and lower flanges circumferentially eliminates the problem of circumferential force imbalance and ensures precise separation and connection of the stop surfaces.

[0009] Preferably, the arc structure of the first waist-shaped plate matches the arc structure of its corresponding upper flange surface; that is, the arc segments on both sides of the first waist-shaped plate and the corresponding arc segments on the inner and outer sides of the upper flange surface are all located on concentrically arranged circles. This structure facilitates aligned installation, achieving precise alignment between the first connecting hole on the first waist-shaped plate and the upper shaft hole on the upper and lower flanges.

[0010] Preferably, two double-ended screws are provided between the first and second waist-shaped plates. One double-ended screw is arranged near the first end of both the first and second waist-shaped plates, and the other double-ended screw is arranged near the second end of both the first and second waist-shaped plates. This structure increases the contact area between the special tool and the upper flange surface, and balances the force between the first waist-shaped plate and the upper flange surface from both ends of the first waist-shaped plate, further improving the circumferential force balance of the upper and lower flanges during assembly and disassembly.

[0011] Preferably, the first waist-shaped plate has a first connecting hole A and a first connecting hole B respectively arranged near its two ends. In use, at least one shaft hole between the first connecting hole A and the first connecting hole B is covered by the first waist-shaped plate. With this structure, the first waist-shaped plate maintains a suitable length in the circumferential direction, so as to facilitate assembly and improve the balance of forces on the upper and lower flanges.

[0012] Preferably, the mounting space is located between the two double-ended screws, and the drive component is located in the center of this mounting space. This structure improves the balance of forces acting on the drive component between the upper and lower flanges.

[0013] Preferably, the driving component is a jack, with its lower end abutting against the second waist-shaped plate, its upper end arranged corresponding to the lower surface of the lower flange, and its operating part located on its outer side. This structure facilitates operation.

[0014] Preferably, a first washer is provided between the first nut and the first waist-shaped plate, and a second washer is provided between the second nut and the second waist-shaped plate. This structure helps to improve installation reliability.

[0015] Preferably, the upper surface of the upper flange has a recessed female stop at its center, and correspondingly, the lower surface of the lower flange has a downwardly protruding male stop at its center. This structure is used to maintain the reliability of the connection between the first shaft and the second shaft, ensuring that they remain concentric during installation and preventing abnormal operation due to axial misalignment.

[0016] Compared with the prior art, the advantages of this utility model are as follows: This utility model provides a special tool suitable for the separation and connection of the main shaft of a hydro turbine unit. In use, two sets of special tools are symmetrically installed on the circumference of the main shaft. When the second shaft needs to be removed, the drive component extends to press the lower flange against the upper flange, the bolts around the upper and lower flanges are removed, and then the drive component retracts. At this time, under the constraint of the two special tools, the second shaft can fall precisely along the axial direction, avoiding the problem of jamming at the stop and making it difficult to separate the first and second shafts. When the first and second shafts need to be joined, the upper and lower flanges and the stop are first aligned. Then, the two sets of special tools are symmetrically installed on the circumference of the upper and lower flanges, and the drive component extends symmetrically from both sides of the upper and lower flanges, so that the two shafts can always maintain precise alignment during the joining process, avoiding the problem of stop misalignment and difficulty in joining. The shafts are joined, and then the bolts are installed. The special tool of this utility model is easy to operate and can effectively improve the efficiency of the separation and connection of the main shaft of a hydro turbine unit. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the assembly structure of the special tool with the first shaft and the second shaft in an embodiment of this utility model; Figure 2 for Figure 1 Enlarged view of part of the image; Figure 3 for Figure 2 Another structural diagram; Figure 4 for Figure 2 A sectional view; Figure 5 This is a schematic diagram of the structure of the special tool in the embodiment of this utility model. Detailed Implementation

[0018] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0019] In the description of this utility model, it should be understood that if terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0021] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] In this utility model, unless otherwise explicitly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact, or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0023] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this invention are for illustrative purposes only and do not represent the only possible implementation.

[0024] like Figure 1 As shown in Figure 5, this embodiment provides a special tool suitable for the separation and connection of the main shaft of a water turbine unit.

[0025] The turbine main shaft of this embodiment includes a first shaft 01 and a second shaft 02 connected vertically. In this embodiment, the first shaft 01 is shown as an intermediate shaft, and the second shaft 02 is shown as the turbine shaft. A lower flange 011 is provided at the lower end of the first shaft 01, and an upper flange 021 is provided at the upper end of the second shaft 02. Several (16 in this embodiment) shaft holes 001 are correspondingly opened on the upper flange 021 and the lower flange 011, arranged circumferentially. Bolts pass through the shaft holes 001 to lock the upper flange 021 and the lower flange 011 together.

[0026] The special tool 100 in this embodiment includes: The double-ended screw 1 is arranged to pass through the shaft hole 001 of the upper flange 021 and the lower flange 011; The first waist-shaped plate 2 is placed on the upper surface of the upper flange 021 and has a first connecting hole 21 for the upper end of the double-ended screw 1 to pass through; The first nut 3 is connected to the upper end of the double-ended screw 1 and locks the first waist-shaped plate 2 onto the upper flange 021; The second waist-shaped plate 4 is arranged near the lower end of the double-ended screw 1 and has a second connecting hole 41 for the lower end of the double-ended screw 1 to pass through. The second nut 5 is connected to the lower end of the double-ended screw 1 and is used to lock the second waist-shaped plate 4 to the lower end of the double-ended screw 1. A mounting space 61 for mounting the drive member 6 is formed between the second waist-shaped plate 4 and the lower flange 011. The drive member 6 is telescopically disposed in the mounting space 61. The drive member 6 extends upward to push the lower flange 011 towards the upper flange 021, and retracts downward to cancel the force applied to the lower flange 011.

[0027] When the second shaft 02 needs to be removed, two sets of special tools are symmetrically installed on the circumference of the main shaft, allowing the drive component 6 to extend and press the lower flange 011 against the upper flange 021. The bolts around the upper and lower flanges 011 are then removed, and the drive component 6 is retracted. At this point, under the constraint of the two special tools, the second shaft 02 can fall precisely along the axial direction, avoiding the problem of jamming at the stop and making it difficult to separate the first shaft 01 and the second shaft 02. When the first shaft 01 and the second shaft 02 need to be joined, the upper and lower flanges 011 and the stop are first aligned. Then, two sets of special tools are symmetrically installed on the circumference of the upper and lower flanges 011, allowing the drive component 6 to extend symmetrically from both sides of the upper and lower flanges 011, so that the two shafts can always maintain precise alignment during the joining process, avoiding the problem of the stop shifting and making it difficult to join. After the shafts are joined, the bolts are installed.

[0028] In this embodiment, two sets of special tools are symmetrically installed circumferentially on the upper flange 021 and the lower flange 011 during use. The two sets of special tools are symmetrically installed circumferentially on the upper and lower flanges 011 to eliminate the problem of circumferential force inconvenience and ensure precise separation and connection of the stop surfaces.

[0029] The arc structure of the first waist-shaped plate 2 matches the arc structure of its corresponding upper flange 021 surface. That is, the arc segments on both sides of the first waist-shaped plate 2 and the corresponding arc segments on the inner and outer surfaces of the upper flange 021 are all located on concentrically arranged circles. This structure facilitates aligned installation, achieving precise alignment between the first connecting hole 21 on the first waist-shaped plate 2 and the shaft hole 001 on the upper and lower flanges 011.

[0030] Two double-ended screws 1 are provided between the first waist-shaped plate 2 and the second waist-shaped plate 4. One double-ended screw 1 is arranged near the first end of the first waist-shaped plate 2 and the second waist-shaped plate 4, and the other double-ended screw 1 is arranged near the second end of the first waist-shaped plate 2 and the second waist-shaped plate 4. This structure is adopted to increase the contact area between the special tool and the upper flange 021 surface, and to balance the force between the first waist-shaped plate 2 and the upper flange 021 surface from both ends of the first waist-shaped plate 2, further improving the circumferential force balance of the upper and lower flanges 011 during disassembly and assembly.

[0031] The aforementioned first waist-shaped plate 2 has first connecting holes A211 and B212 respectively arranged near its two ends. In use, at least one shaft hole 001 between the first connecting hole A and the first connecting hole B is covered by the first waist-shaped plate 2. With this structure, the first waist-shaped plate 2 maintains a suitable length in the circumferential direction, so as to facilitate assembly and improve the balance of forces on the upper and lower flanges 011.

[0032] The aforementioned mounting space 61 is located between the two double-ended screws 1, and the drive component 6 is located in the center of the mounting space 61. This structure is adopted to improve the balance of forces acting on the drive component 6 between the upper and lower flanges 011.

[0033] In this embodiment, the driving component 6 is a jack, with its lower end abutting against the second waist-shaped plate 4, and its upper end arranged corresponding to the lower surface of the lower flange 011. The operating part 62 of the jack is located on its outer side. This structure facilitates operation. Of course, other forms of driving component 6 structures can also be used, as long as they can achieve telescopic movement.

[0034] In this embodiment, a first washer 7 is provided between the first nut 3 and the first waist-shaped plate 2, and a second washer 8 is provided between the second nut 5 and the second waist-shaped plate 4. This structure helps to improve installation reliability.

[0035] In this embodiment, the upper surface of the upper flange 021 has a recessed female stop 022 at the center, and correspondingly, the lower surface of the lower flange 011 has a downwardly protruding male stop 012 at the center. This structure is used to maintain the reliability of the connection between the first shaft 01 and the second shaft 02, ensuring that they remain concentric during installation and preventing abnormal operation due to axial deviation.

[0036] Using the special tools of this embodiment, when it is necessary to remove the second shaft 02, first symmetrically retain 4 connecting bolts between the generator and the second shaft 02, and remove the remaining 10 connecting bolts using a hydraulic tensioning tool; then, pass the two double-ended bolts through the two shaft holes 001 spaced apart by one shaft hole 001, place the first waist-shaped plate 2 on the upper end face of the lower flange 011 of the first shaft 01, and align it with the shaft hole 001 of the lower flange 011, and lock it with the first nut 3, then install the second waist-shaped plate 4 on the lower end of the double-ended screw 1, and use the first... Tighten the two nuts 5, and install the drive component 6 in the installation space 61 between the upper flange 021 and the second waist-shaped plate 4. Two sets of special tools need to be symmetrically installed around the upper and lower flanges 011. Evenly lift the two jacks until they are firmly in place, remove the remaining four connecting bolts of the first shaft 01 and the second shaft 02, loosen the second nuts 5 at the lower end of the second waist-shaped plate 4 of the two special tools by one turn, and then slowly release the pressure of the two jacks to slowly lower the second shaft 02. Repeat the above steps to separate the first shaft 01 and the second shaft 02. When it is necessary to connect the first shaft 01 and the second shaft 02, first align the upper and lower flanges 011 and the stop, then symmetrically install the two sets of special tools around the upper and lower flanges 011, evenly lift the two jacks by the same distance, tighten the nuts of the second waist-shaped plate 4 at the lower end of the two special tools, and then lift the two jacks upwards. Repeat this step until the two shafts are connected, install the bolts, remove the special tools, and then install the remaining bolts.

[0037] It is understood that the first shaft 01 in this embodiment can also be shown as a generator shaft, and correspondingly, the second shaft 02 is an intermediate shaft.

[0038] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0039] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A special tool for separating and connecting the main shaft of a hydro-turbine unit, the main shaft of the hydro-turbine unit comprising a first shaft (01) and a second shaft (02) joined together vertically, the lower end of the first shaft being provided with a lower flange (011), and the upper end of the second shaft (02) being provided with an upper flange (021), wherein the upper flange (021) and the lower flange (011) are respectively provided with a plurality of circumferentially arranged shaft holes (001), and bolts pass through the shaft holes (001) to lock the upper flange (021) and the lower flange (011) together; characterized in that: The special tools mentioned include A double-ended screw (1) is arranged to pass through the shaft hole (001) of the upper flange (021) and the lower flange (011); The first waist-shaped plate (2) is placed on the upper surface of the upper flange (021) and has a first connecting hole (21) through which the upper end of the double-ended screw (1) passes; The first nut (3) is connected to the upper end of the double-ended screw (1) and locks the first waist-shaped plate (2) onto the upper flange (021); The second waist-shaped plate (4) is arranged near the lower end of the double-ended screw (1) and has a second connecting hole (41) through which the lower end of the double-ended screw (1) passes. The second nut (5) is connected to the lower end of the double-ended screw (1) and is used to lock the second waist-shaped plate (4) at the lower end of the double-ended screw (1); The drive member (6) has an installation space (61) formed between the second waist-shaped plate (4) and the lower flange (011) for mounting the drive member (6). The drive member (6) is telescopically disposed in the installation space (61). The drive member (6) extends upward to push the lower flange (011) towards the upper flange (021), and retracts downward to cancel the force applied to the lower flange (011).

2. The special tool for separating and connecting the main shaft of a hydraulic turbine unit according to claim 1, characterized in that: The special tools are in two sets and are symmetrically installed on the circumference of the upper flange (021) and the lower flange (011) in use.

3. The special tool for separating and connecting the main shaft of a hydraulic turbine unit according to claim 1, characterized in that: The arc structure of the first waist-shaped plate (2) matches the arc structure of its corresponding upper flange (021) surface.

4. The special tool for separating and connecting the main shaft of a hydraulic turbine unit according to claim 1, characterized in that: Two double-headed screws (1) are provided between the first waist-shaped plate (2) and the second waist-shaped plate (4). One double-headed screw (1) is arranged close to the first end of the first waist-shaped plate (2) and the second waist-shaped plate (4), and the other double-headed screw (1) is arranged close to the second end of the first waist-shaped plate (2) and the second waist-shaped plate (4).

5. The special tool for separating and connecting the main shaft of the hydraulic turbine unit according to claim 4, characterized in that: The first waist-shaped plate (2) has a first connecting hole A and a first connecting hole B arranged near its two ends respectively. In use, at least one shaft hole (001) between the first connecting hole A and the first connecting hole B is covered by the first waist-shaped plate (2).

6. The special tool for separating and connecting the main shaft of a hydraulic turbine unit according to claim 4, characterized in that: The installation space (61) is located between two double-ended screws (1), and the driving component (6) is located in the center of the installation space (61).

7. The special tool for separating and connecting the main shaft of a hydraulic turbine unit according to any one of claims 1 to 6, characterized in that: The driving component (6) is a jack, the lower end of which abuts against the second waist-shaped plate (4), the upper end of which is arranged on the lower surface of the lower flange (011), and the operating part of which is located on its outer side.

8. The special tool for separating and connecting the main shaft of a hydraulic turbine unit according to any one of claims 1 to 6, characterized in that: A first washer (7) is provided between the first nut (3) and the first waist-shaped plate (2), and a second washer (8) is provided between the second nut (5) and the second waist-shaped plate (4).

9. The special tool for separating and connecting the main shaft of a hydraulic turbine unit according to any one of claims 1 to 6, characterized in that: The upper surface of the upper flange (021) has a recessed female stop (022) in the center, and correspondingly, the lower surface of the lower flange (011) has a downwardly protruding stop (012) in the center.

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