Integral hoisting tool for large hydro-generator stator

Abstract

The utility model provides an integral hoisting tool for a stator of a large hydraulic generator, which comprises a central supporting seat, a plurality of hoisting arms arranged along the circumference of the central supporting seat, two groups of pin penetrating lug plates arranged at the top of the central supporting seat, a pin shaft arranged between the two groups of pin penetrating lug plates, and screw rod components arranged at the end parts of the hoisting arms, the screw assembly is used for connecting the hoisting arm and the water turbine stator, and a screw of the screw assembly penetrates through the hoisting holes in the hoisting arm and the water turbine stator base and then is fixed through a nut. According to the tool, the hydraulic generator stator is vertically and integrally hoisted, the stator is prevented from shaking in the hoisting process, and the stator is prevented from being deformed due to uneven stress through multi-point hoisting.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic generator stator hoisting, in particular to a large hydraulic generator stator integral hoisting tool. Background Art

[0002] The stator of a large hydro-turbine generator includes a stator frame, an iron core, etc. Generally, when installing a large hydro-turbine generator stator, each part is hoisted to the pit before the stator is assembled. The installation period is long. For the overall transformation and replacement of the stator of a large hydro-turbine generator set, when the stator is assembled in the pit, the maintenance and installation of other equipment cannot be carried out simultaneously, which is not conducive to the simultaneous work. Therefore, when some hydro-turbine generator stators are overhauled and replaced, the equipment maintenance period is saved by assembling them outside the pit and then hoisting them as a whole to the pit. After the stator frame is installed, the stator core positioning ribs are installed, the stator core is stacked, and pressed outside the pit. After the stator core is installed, it is hoisted as a whole to the pit. The total weight of the entire hydro-turbine generator stator is about 2000T, and the overall size is about φ20m. Therefore, it is necessary to reasonably set the hoisting tools to prevent deformation during the stator hoisting process. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a large-scale hydro-generator stator integral hoisting tool, which realizes vertical hoisting, prevents the stator from shaking during hoisting, and hoists at multiple points to prevent the stator from being deformed due to uneven force.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a large-scale hydro-generator stator integral lifting tool, including a central support seat, a plurality of lifting arms are arranged along the circumference of the central support seat, two groups of pin-through ear plates are arranged on the top of the central support seat, a pin shaft is arranged between the two groups of pin-through ear plates, a screw assembly is arranged at the end of the lifting arm, the screw assembly is used to connect the lifting arm and the turbine stator, and the screw of the screw assembly passes through the lifting holes on the lifting arm and the turbine stator base and is fixed by a nut.

[0005] In a preferred embodiment, a reinforcing support is provided on the upper side of the end of the lifting arm, and the reinforcing support includes an upper support plate and a lower support plate, the upper support plate and the lower support plate are connected by a connecting plate, and a through hole is provided on the reinforcing support for the screw to pass through.

[0006] In the preferred embodiment, the upper support plate and the lower support plate are both arc-shaped plates, and the ends of the upper support plate and the lower support plate are provided with connecting ribs. The upper support plates and the lower support plates of two adjacent groups of reinforced supports are connected by bolts, and the bolts are installed on the connecting ribs.

[0007] In a preferred solution, the lifting arm includes a connecting arm and an extension arm, one end of the connecting arm is connected to the central support seat, and the connecting arm and the extension arm are connected by bolts.

[0008] In a preferred solution, both ends of the pin shaft are provided with limiting grooves, and the "U"-shaped limiting plate is mounted in the limiting groove and connected to the pin ear plate through bolts.

[0009] The utility model provides a large-scale hydro-generator stator integral hoisting tool, which has the following beneficial effects:

[0010] 1. The tool sets multiple sets of lifting arms along the circumference to form multi-point connections with the turbine generator stator to prevent the stator from deforming during the lifting process due to uneven force. By setting the pin-through ear plate and pin shaft, it is convenient to connect with the main hook of the crane. Vertical lifting can be achieved without setting a lifting rope, ensuring the stability of the lifting process.

[0011] 2. By setting up a reinforced support, on the one hand, multiple lifting arm ends form a connection structure to improve the overall stability; on the other hand, setting up a reinforced support can improve the connection strength with the screw assembly.

[0012] 3. The lifting arm is set as a split structure, which is convenient for replacing extension arms of different sizes according to different stator sizes, thereby improving applicability.

[0013] 4. Through the cooperation of the "U"-shaped limiting plate and the limiting groove, the pin shaft is limited and fixed to achieve the locking of the pin shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0015] Figure 1 It is a schematic diagram of the top view structure of the utility model;

[0016] Figure 2 This is a structural diagram of the lifting tool during lifting;

[0017] Figure 3 Schematic diagram of the installation structure of the pin shaft;

[0018] Figure 4 It is a schematic diagram of the installation structure of the "U"-shaped limiting plate;

[0019] In the figure: central support seat 1, lifting arm 2, pin ear plate 3, pin shaft 4, turbine stator 5, screw 6, reinforcement support 7, "U"-shaped limiting plate 8, connecting arm 201, extension arm 202, limiting groove 401, upper support plate 701, lower support plate 702, connecting plate 703, connecting rib plate 704. DETAILED DESCRIPTION

[0020] Embodiment 1:

[0021] like Figures 1 to 4 As shown, a large-scale hydro-turbine generator stator integral lifting tool includes a central support seat 1, which is a circular seat. A plurality of lifting arms 2 are arranged along the circumference of the central support seat 1. The lifting arms 2 are distributed in a circular shape. The length of the lifting arms 2 is consistent with the radius of the stator to be lifted, that is, the end of the lifting arm 2 needs to be arranged on the upper side of the turbine stator base.

[0022] Two groups of pin-through lug plates 3 are arranged on the top of the central support seat 1. The two groups of pin-through lug plates 3 are arranged in parallel. The pin-through lug plates 3 are welded to the central support seat 1. A reinforcing rib plate is also welded between the pin-through lug plates 3 and the central support seat 1. A reinforcing rib plate can also be arranged between the two groups of pin-through lug plates 3 for connection. Pin holes are arranged on the pin-through lug plates 3 corresponding to the pin shaft 4. A pin shaft 4 is arranged between the two groups of pin-through lug plates 3. The pin shaft 4 is arranged between the two groups of pin-through lug plates 3 to form a hook mechanism, which is connected to the main hook of the crane.

[0023] A screw assembly is provided at the end of the lifting arm 2, and the screw assembly is used to connect the lifting arm 2 and the turbine stator 5. Specifically, the screw 6 of the screw assembly passes through the lifting holes on the lifting arm 2 and the turbine stator 5 base and is fixed by a nut. In this embodiment, two sets of screw assemblies are correspondingly arranged for each set of lifting arms 2.

[0024] The tool is provided with multiple groups of lifting arms 2 along the circumference to form multi-point connections with the stator of the turbine generator, thereby preventing the stator from being deformed during the lifting process due to uneven force. The pin-through ear plate 3 and the pin shaft 4 are provided to facilitate connection with the main hook of the crane, and vertical lifting can be achieved without the need for a lifting rope, thereby ensuring the stability of the lifting process.

[0025] Preferably, Figure 3~4 As shown, both ends of the pin shaft 4 are provided with limit grooves 401, and the "U"-shaped limit plate 8 is clamped in the limit groove 401 and connected to the pin ear plate 3 through bolts. The limit groove 401 is an annular groove or an arc groove that cooperates with the "U"-shaped limit plate 8. The pin shaft 4 is limited and fixed through the cooperation between the "U"-shaped limit plate 8 and the limit groove 401.

[0026] Embodiment 2:

[0027] Different from Example 1, Figure 1~2 As shown, a reinforcing support 7 is provided on the upper side of the end of the lifting arm 2, and the reinforcing support 7 includes an upper support plate 701 and a lower support plate 702. The lower support plate 702 is welded and fixed to the end of the lifting arm 2. The upper support plate 701 and the lower support plate 702 are connected by a connecting plate 703. A through hole is provided on the reinforcing support 7 for the screw 6 to pass through.

[0028] The upper support plate 701 and the lower support plate 702 are both arc-shaped plates, and the ends of the upper support plate 701 and the lower support plate 702 are provided with connecting ribs 704. The upper support plates 701 and the lower support plates 702 of two adjacent groups of reinforcing supports 7 are connected by bolts, and the bolts are installed on the connecting ribs 704, so that multiple reinforcing supports 7 are connected to form a ring structure.

[0029] By providing the reinforcing support 7, on the one hand, the ends of the plurality of lifting arms 2 form a connection structure to improve the overall stability; on the other hand, providing the reinforcing support 7 improves the connection strength with the screw assembly.

[0030] Embodiment 3:

[0031] Different from Example 1, Figure 1 and 2 As shown, the lifting arm 2 includes a connecting arm 201 and an extension arm 202. One end of the connecting arm 201 is connected to the central support seat 1, and the connecting arm 201 and the extension arm 202 are connected by bolts.

[0032] The lifting arm 2 is configured as a split structure, so that it is convenient to replace the extension arms 202 of different sizes according to different stator sizes, thereby improving applicability.

[0033] The tool works as follows:

[0034] After the stator base is installed, the stator core positioning ribs are installed, the stator core is stacked, and the pressing is carried out outside the pit to complete the stator core installation. Before lifting, place this tool above the turbine stator base. The stator base is processed with a through hole at a suitable position to allow the screw 6 to be inserted. During installation, the screw 6 is passed from the through hole to the bottom of the middle ring plate of the stator base, and then the screw assembly and the stator base are locked to complete the rigid connection. Then the main hook of the crane is dropped between the two sets of pin-through ear plates 3, the pin shaft 4 is inserted, and the "U"-shaped limit plate 8 is installed to lock the pin shaft 4. The stator of the turbine generator is hoisted as a whole to the pit by the crane.

Claims

1. A large-scale hydro-generator stator integral lifting tool, comprising a central support seat (1), a plurality of lifting arms (2) arranged along the circumference of the central support seat (1), characterized in that: Two groups of pin-penetrating ear plates (3) are provided on the top of the central support seat (1), a pin shaft (4) is provided between the two groups of pin-penetrating ear plates (3), a screw assembly is provided at the end of the lifting arm (2), the screw assembly is used to connect the lifting arm (2) and the turbine stator (5), and a screw (6) of the screw assembly passes through the lifting holes on the lifting arm (2) and the turbine stator (5) base and is fixed by a nut.

2. A large-scale hydro-generator stator integral lifting tool according to claim 1, characterized in that: A reinforcing support (7) is provided on the upper side of the end of the lifting arm (2), the reinforcing support (7) comprising an upper support plate (701) and a lower support plate (702), the upper support plate (701) and the lower support plate (702) being connected via a connecting plate (703), and a through hole for the screw rod (6) to pass through is provided on the reinforcing support (7).

3. A large-scale hydro-generator stator integral lifting tool according to claim 2, characterized in that: The upper support plate (701) and the lower support plate (702) are both arc-shaped plates, and the ends of the upper support plate (701) and the lower support plate (702) are both provided with connecting rib plates (704). The upper support plates (701) and the lower support plates (702) of two adjacent groups of reinforcing supports (7) are connected by bolts, and the bolts are installed on the connecting rib plates (704).

4. A large-scale hydro-generator stator integral lifting tool according to claim 1, characterized in that: The lifting arm (2) comprises a connecting arm (201) and an extension arm (202); one end of the connecting arm (201) is connected to the central support seat (1); and the connecting arm (201) and the extension arm (202) are connected by bolts.

5. A large-scale hydro-generator stator integral lifting tool according to claim 1, characterized in that: The two ends of the pin shaft (4) are provided with limiting grooves (401), and the "U"-shaped limiting plate (8) is clamped in the limiting groove (401) and connected to the pin ear plate (3) through bolts.

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