Large generator stator base welding displacement device

Abstract

The utility model provides a large-scale generator stator frame welding displacement device, which is used for adjusting the position of a large-scale generator stator frame when the large-scale generator stator frame is welded, and comprises a transition shaft and a rack, the transition shaft is fixedly connected with the stator frame, the transition shaft is rotatably connected with the rack, the transition shaft comprises an inner ring and an outer ring, the inner ring and the outer ring are eccentrically arranged, the inner ring and the stator base cylinder are concentrically arranged, and the axis of the outer ring passes through the gravity center of the stator base and is perpendicular to the gravity center line of the stator base. The transition shaft is rotatably connected with the rack and can drive the stator base to displace on the rack, an inner ring of the transition shaft and a cylinder body of the stator base are coaxial so that the transition shaft and the stator base can be conveniently installed, and the axis of an outer ring passes through the gravity center of the stator base and is perpendicular to the gravity center line of the stator base so that the stator base can rotate around the gravity center of the stator base during rotation. And the rotating angle cannot be controlled due to the unstable gravity center.

Description

Technical Field

[0001] The utility model belongs to the technical field of welding positioners, in particular to a welding positioner for a large generator stator frame. Background Art

[0002] The stator frame supports the stator core or core assembly and the stator windings. It is welded together by two end covers, an annular center diaphragm, an outer cover, ventilation ducts, and supporting components. During operation, the stator frame bears the weight of components above the upper frame and transmits it to the foundation. It supports the core, windings, cooler, and cover, bearing the stator's own weight. For suspended hydro-turbine generators, it also bears the mass of the entire rotating unit (including hydraulic thrust). The frame also withstands electromagnetic torque, unbalanced magnetic pull, and tangential shear forces. Therefore, the stator frame's fabrication demands high standards and requires extensive welding processes. In terms of welding difficulty, weld formation, and quality control, flat welding is the most optimal, followed by vertical welding, and overhead welding is the least optimal. Therefore, the stator frame's position needs to be adjusted. However, the stator frame of a large generator is large and heavy, and the uneven distribution of components within the stator frame results in a non-central center of gravity. Simply rotating it does not maintain its rotation angle, but instead causes it to continue rotating uncontrollably under the influence of the center of gravity.

[0003] Therefore, the above problems need to be solved urgently. Utility Model Content

[0004] Purpose of the utility model: In order to overcome the above shortcomings, the utility model provides a large generator stator frame welding displacement device, which is connected to the stator frame by a transition shaft, and the transition shaft is driven to rotate by a roller. The outer ring and the inner ring are eccentrically arranged, and the axis of the outer ring passes through the center of gravity of the stator frame and is perpendicular to its center of gravity line. Then, when the outer ring rotates, it is equivalent to the stator frame rotating around its center of gravity, and its rotation angle will not be unable to be controlled due to its unstable center of gravity.

[0005] Technical solution: To achieve the above-mentioned purpose, the present invention provides a large-scale generator stator frame welding displacement device, which is used to adjust the position of the large-scale generator stator frame during welding. The device comprises a transition shaft and a frame. The transition shaft is fixedly connected to the stator frame and rotatably connected to the frame. The transition shaft comprises an inner ring and an outer ring. The inner and outer rings are eccentrically arranged. The inner ring is concentrically arranged with the stator frame cylinder. The axis of the outer ring passes through the center of gravity of the stator frame and is perpendicular to its center of gravity. The transition shaft is rotatably connected to the frame. The transition shaft can drive the stator frame to shift position on the frame. The inner ring of the transition shaft is coaxial with the stator frame cylinder to facilitate the installation of the transition shaft and the stator frame. The axis of the outer ring passes through the center of gravity of the stator frame and is perpendicular to its center of gravity to ensure that the stator frame rotates around its center of gravity during rotation.

[0006] Preferably, one side of the inner ring and the outer ring is connected by a back plate, and an end plate is provided on the other end face of the outer ring away from the back plate;

[0007] A reinforcement component is provided between the outer ring and the inner ring.

[0008] A group of load-bearing rings are distributed on the outside of the back plate, and the load-bearing rings are connected to the back plate through at least one connecting component, and the connecting component is connected to the stator frame.

[0009] Furthermore, the connection assembly includes a plurality of pressure plates, a first connecting bolt, and a second connecting bolt. The pressure plates are provided with a through hole and a waist-shaped hole. The first connecting bolt passes through the through hole and is threadedly connected to the load-bearing ring. The second connecting bolt passes through the waist-shaped hole and is threadedly connected to the load-bearing ring. The pressure plates are engaged with the inner end surface of the stator base cylinder. The pressure plates are evenly distributed inside the stator base cylinder and are tightly fastened to the inner side of the stator base cylinder by the first and second connecting bolts to achieve a stable connection between the transition shaft and the stator base.

[0010] In addition, a spring is sleeved on the second connecting bolt, and both ends of the spring are in contact with the load-bearing ring and the pressure plate respectively. There is a gasket between the second connecting bolt and the pressure plate, and the pressure plate is evenly arranged on the load-bearing ring.

[0011] Furthermore, the reinforcement assembly includes a reinforcement ring, which is arranged on the inner side of the outer ring, and a reinforcement rib plate 1 is provided between the reinforcement ring and the inner ring, and a reinforcement rib plate 2 is provided on both sides of the reinforcement ring, and a reinforcement rib plate 3 is provided on the reinforcement ring between the two reinforcement rib plates 1, and the two ends of the reinforcement rib plate 3 are respectively connected to the outer ring and the reinforcement rib plate 1.

[0012] Due to the large size and weight of the large stator frame, the transition shaft as the main load-bearing component has high requirements for its structural strength. The structural strength of the transition shaft is greatly enhanced by the reinforcement ring, reinforcement rib plate 1, reinforcement rib plate 2 and reinforcement rib plate 3.

[0013] Furthermore, the frame is equipped with a set of rollers that mate with the outer surface of the outer ring and are driven by a motor. The rollers are coated with copper. The rotation of the rollers on the frame drives the transition shaft. The copper coating on the rollers is relatively soft and deforms under the weight of the stator frame and transition shaft, preventing slippage during relative rotation between the rollers and the transition shaft.

[0014] Furthermore, a lifting lug connection hole is provided on the outer facade of the outer ring, and the lifting lug connection hole can be connected to the lifting lug. After the lifting lug is installed, the transition shaft is lifted and installed on the stator base by a lifting device, and then hoisted to the frame by the lifting device after installation.

[0015] It can be seen from the above technical solution that the utility model has the following beneficial effects:

[0016] 1. This utility model provides a large generator stator frame welding position changing device, which uses a transition shaft connected to the stator frame, a roller drives the transition shaft to rotate, and the transition shaft then drives the stator frame to rotate and change position, making welding easier;

[0017] 2. The outer ring and inner ring of the transition shaft in the present invention are eccentrically arranged, and the axis of the outer ring passes through the center of gravity of the stator base and is perpendicular to its center of gravity line. Therefore, when the outer ring rotates, it is equivalent to the stator base rotating around its center of gravity, and its rotation angle will not be uncontrollable due to its unstable center of gravity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of a large generator stator frame welding displacement device according to the present invention;

[0019] Figure 2 This is a schematic structural diagram of the transition shaft of the present invention (omitting the end plate);

[0020] Figure 3 This is a front view of the transition shaft described in the present utility model;

[0021] Figure 4 This is a schematic diagram of the installation of the connection assembly described in the present utility model;

[0022] Figure 5 The utility model is a schematic diagram of a large generator stator frame welding displacement device and a stator frame assembly.

[0023] In the figure: 1-transition shaft, 11-inner ring, 12-outer ring, 121-lifting ear connection hole, 13-back plate, 131-load-bearing ring, 14-end plate, 15-connecting assembly, 151-pressure plate, 152-first connecting bolt, 153-second connecting bolt, 16-reinforcement assembly, 161-reinforcement ring, 162-reinforcement rib plate 1, 163-reinforcement rib plate 2, 164-reinforcement rib plate 3, 2-frame, 21-roller, 3-stator base. DETAILED DESCRIPTION

[0024] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] like Figure 1 、 Figure 3The device is used to adjust the position of a large generator stator frame during welding. The device comprises a transition shaft 1 and a frame 2. The transition shaft 1 is fixedly connected to the stator frame and rotatably connected to the frame 2. The transition shaft 1 comprises an inner ring 11 and an outer ring 12. The inner ring 11 and the outer ring 12 are eccentrically arranged. The inner ring 11 is concentrically arranged with the stator frame cylinder. The axis of the outer ring 12 passes through the center of gravity of the stator frame and is perpendicular to its center of gravity.

[0026] It should be noted that the eccentric angle and distance between the inner ring 11 and the outer ring 12 are determined according to the center of gravity of the stator base 3. The workers first calculate the center of gravity position of the stator base 3, and then design the transition shaft 1 so that the inner ring 11 in the transition shaft 1 is coaxial with the cylinder of the stator base 3, and the outer ring 12 passes through the center of gravity of the stator base 3 and is perpendicular to its center of gravity line.

[0027] in,

[0028] One side of the inner ring 11 and the outer ring 12 is connected by a back plate 13, and an end plate 14 is provided on the other end surface of the outer ring 12 away from the back plate 13;

[0029] A reinforcement component 16 is provided between the outer ring 12 and the inner ring 11;

[0030] A group of load-bearing rings 131 are distributed on the outer side of the back plate 13 . The load-bearing rings 131 are connected to the back plate 13 via at least one connecting component 15 , and the connecting component 15 is connected to the stator frame 3 .

[0031] Specifically, such as Figure 4 As shown, the connecting assembly 15 includes several pressure plates 151, a first connecting bolt 152 and a second connecting bolt 153. The pressure plate 151 is provided with a through hole and a waist-shaped hole. The first connecting bolt 152 passes through the through hole and is threadedly connected to the load-bearing ring 131. The second connecting bolt 153 passes through the waist-shaped hole and is threadedly connected to the load-bearing ring 131. The pressure plate 151 cooperates with the inner end surface of the cylinder of the stator frame 3.

[0032] A further optimized solution is that a spring is sleeved on the second connecting bolt 154, and the two ends of the spring respectively contact the load-bearing ring 131 and the pressure plate 151, and there is a gasket between the second connecting bolt 153 and the pressure plate 151, and the pressure plate 151 is evenly arranged on the load-bearing ring 131.

[0033] like Figure 2As shown, the reinforcement assembly 16 includes a reinforcement ring 161. The reinforcement ring 161 is arranged on the inner side of the outer ring 12. A reinforcement rib plate 162 is provided between the reinforcement ring 161 and the inner ring 11, and a reinforcement rib plate 2 163 is provided on both sides of the reinforcement ring 161. A reinforcement rib plate 3 164 is provided on the reinforcement ring 161 between the two reinforcement rib plates 1 162. The two ends of the reinforcement rib plate 3 164 are respectively connected to the outer ring 12 and the reinforcement rib plate 1 162.

[0034] like Figure 1 As shown, a set of rollers 21 are provided on the frame 2, and the rollers 21 cooperate with the outer surface of the outer ring 12. The rollers 21 are driven by a motor and are covered with a copper layer. The motor is not shown in the figure.

[0035] like Figure 4 As shown, a lifting ear connection hole 121 is provided on the outer facade of the outer ring 12, and the lifting ear connection hole 121 can be connected to the lifting ear.

[0036] The utility model provides a large generator stator frame welding displacement device. When in use, the worker first installs the lifting ear through the lifting ear connection hole 121 on the outer ring 12, lifts the entire transition shaft 1 close to both sides of the stator frame 3, and then fastens the pressure plate 152 to the inner end surface of the stator frame 3 cylinder through the first connecting bolt 153 and the second connecting bolt 154 to complete the installation of the transition shaft 2 and the stator frame 3. Then, the two are lifted by the lifting equipment and the transition shaft 1 is placed on the roller on the frame 2. The motor drives the roller 21 to rotate and thus drives the transition shaft 1 to rotate. However, the axis of rotation is the axis of the outer ring 12. The axis of the outer ring 12 passes through the center of gravity of the stator base 3 and is perpendicular to its center of gravity. Therefore, during rotation, the stator base 3 is equivalent to rotating around its center of gravity. In this way, the stator base 3 will not rotate uncontrollably on the roller 21 due to unstable center of gravity, so that most of the welds on the stator base 3 can be adjusted to the flat welding position through mechanical rotation and displacement, thereby improving product quality.

[0037] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements can be made without departing from the principles of the present invention. These improvements should also be regarded as within the scope of protection of the present invention.

Claims

1. A large generator stator frame welding displacement device, characterized in that: The invention comprises a transition shaft (1) and a frame (2), wherein the transition shaft (1) is fixedly connected to the stator base (3), and the transition shaft (1) is rotatably connected to the frame (2). The transition shaft (1) comprises an inner ring (11) and an outer ring (12), wherein the inner ring (11) and the outer ring (12) are eccentrically arranged, and the inner ring (11) is concentrically arranged with the cylinder of the stator base (3), and the axis of the outer ring (12) passes through the center of gravity of the stator base (3) and is perpendicular to the center of gravity line thereof.

2. A large generator stator frame welding displacement device according to claim 1, characterized in that: One side of the inner ring (11) and the outer ring (12) are connected via a back plate (13), and an end plate (14) is provided on the other end face of the outer ring (12) away from the back plate (13); A reinforcement component (16) is provided between the outer ring (12) and the inner ring (11).

3. A large generator stator frame welding displacement device according to claim 2, characterized in that: A group of load-bearing rings (131) are distributed on the outer side of the back plate (13), and the load-bearing rings (131) are connected to the back plate (13) via at least one connecting assembly (15), and the connecting assembly (15) is connected to the stator frame (3).

4. A large generator stator frame welding displacement device according to claim 3, characterized in that: The connecting assembly (15) includes a plurality of pressure plates (151), a first connecting bolt (152) and a second connecting bolt (153). The pressure plate (151) is provided with a through hole and a waist-shaped hole. The first connecting bolt (152) passes through the through hole and is threadedly connected to the load-bearing ring (131). The second connecting bolt (153) passes through the waist-shaped hole and is threadedly connected to the load-bearing ring (131). The pressure plate (151) is matched with the inner end surface of the cylinder of the stator base (3).

5. A large generator stator frame welding displacement device according to claim 4, characterized in that: A spring is sleeved on the second connecting bolt (153), and two ends of the spring respectively contact the load-bearing ring (131) and the pressure plate (151). A gasket is provided between the second connecting bolt (153) and the pressure plate (151), and the pressure plate (151) is evenly arranged on the load-bearing ring (131).

6. A large generator stator frame welding displacement device according to claim 2, characterized in that: The reinforcement assembly (16) includes a reinforcement ring (161). The reinforcement ring (161) is arranged on the inner side of the outer ring (12). A reinforcement rib plate 1 (162) is provided between the reinforcement ring (161) and the inner ring (11), and reinforcement rib plates 2 (163) are provided on both sides of the reinforcement ring (161). A reinforcement rib plate 3 (164) is provided on the reinforcement ring (161) between the two reinforcement rib plates 1 (162). The two ends of the reinforcement rib plate 3 (164) are respectively connected to the outer ring (12) and the reinforcement rib plate 1 (162).

7. A large generator stator frame welding displacement device according to claim 1, characterized in that: A group of rollers (21) are provided on the frame (2), the rollers (21) cooperate with the outer facade of the outer ring (12), and the rollers (21) are driven by a motor.

8. A large generator stator frame welding displacement device according to claim 7, characterized in that: The roller (21) is covered with a copper layer.

9. A large generator stator frame welding displacement device according to claim 1, characterized in that: A lifting lug connection hole (121) is provided on the outer facade of the outer ring (12), and the lifting lug connection hole (121) can be connected to a lifting lug.

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