Stator bar bending device of water-turbine generator set

Abstract

The utility model relates to a hydroelectric generating set stator bar bending device, which comprises a base, a clamping and bending assembly and a pair of bending guiding assemblies, the clamping and bending assembly comprises a supporting frame and a sliding frame, the bending guiding assemblies comprise positioning frames, the bending guiding assemblies are respectively arranged on the front side and the rear side of the clamping and bending assembly, the base is fixedly connected with the lower end of the supporting frame, and the sliding frame is fixedly connected with the base. The upper end of the supporting frame extends upwards in the vertical direction, the supporting frame is further fixedly connected with the guide rails, the left side and the right side of the sliding frame are sleeved on the guide rails, a plurality of main scale marks are further arranged on the surface of the base and used for marking the relative horizontal distance between the positioning frame and the supporting frame, and a plurality of auxiliary scale marks are further arranged on the surface of the supporting frame and used for marking the relative horizontal distance between the positioning frame and the supporting frame. The auxiliary scale marks are used for marking the relative height distance between the sliding frame and the base. By adopting the technical scheme provided by the utility model, an operator applies a rotating torque to the driving plate and enables the sliding frame to be lifted from the surface of the base to a preset lifting position by observing the auxiliary scale marks, so that the bending angle of the stator bar meets the pre-designed requirement.

Description

Technical Field

[0001] This utility model belongs to the technical field of hydro-generator maintenance equipment, and in particular relates to a stator bar bending device for hydro-generators. Background Technology

[0002] Stator bars are important components of hydro-generator sets and require regular maintenance or replacement. The stator bars of a hydro-generator are composed of many strands connected in parallel and welded together at the ends by a joint sleeve. Due to the different geographical conditions and environments of each power station, the operating conditions of the corresponding hydro-generator sets are also different, and consequently, the shape and size of the stator bars are also different.

[0003] In the prior art, patent document with publication number "CN204721129U" discloses a hybrid transposition structure for the stator bars of a large hydro-generator. The bars employ a hybrid transposition method combining incomplete 360° transposition with empty transposition sections. These empty transposition sections are added to both ends of the stator bar slots, meaning they are directly connected to the straight sections at the ends, preventing the bars from being interrupted during the incomplete transposition process. This patented technology further reduces the circulating losses of the hydro-generator stator bars by achieving incomplete 360° transposition, improving generator efficiency and reliability, and reducing manufacturing difficulty. However, in some power plants, bending the stator bars is required during assembly to accommodate available operating space. Currently, there are no bending devices for stator bars in the prior art; therefore, there is an urgent need to develop a stator bar bending device for hydro-generators. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a stator bar bending device for a hydro-generator set.

[0005] This utility model provides a stator bar bending device for a hydro-generator set, including a base, a bending clamping assembly, and a pair of bending guide assemblies. The bending clamping assembly includes a support frame and a sliding frame, and the bending guide assembly includes a positioning frame. The pair of bending guide assemblies are arranged on the front and rear sides of the bending clamping assembly. The base is fixedly connected to the lower end of the support frame, and the upper end of the support frame extends upward in the vertical direction. The support frame is also fixedly connected to a guide rail. The left and right sides of the sliding frame are fitted onto the guide rail. The surface of the base is also provided with several main scale lines, which are used to indicate the relative horizontal distance between the positioning frame and the support frame. The surface of the support frame is also provided with several secondary scale lines, which are used to indicate the relative height distance between the sliding frame and the base.

[0006] The distance between any two adjacent main scale lines is 1 mm.

[0007] The distance between any two adjacent sub-scale lines is 1 mm.

[0008] The surface of the base is also provided with a limiting groove, and the bottom of the positioning frame fits into the limiting groove.

[0009] The cross-section of the limiting groove is a dovetail groove shape, which is smaller at the top and larger at the bottom.

[0010] The bending assembly also includes a dial, which is mounted on the support frame using a rolling bearing. The slider is also fixedly connected to one end of the pull rod, and the other end of the pull rod is screwed to the dial.

[0011] The dial can be replaced with a hexagonal nut.

[0012] Both the bending clamping assembly and the guiding bending assembly include a roller, a pressure roller, and a positioning rod. The left and right sides of the roller are hinged to the positioning frame or the support frame. The left and right sides of the pressure roller are respectively hinged to one end of the positioning rod. The other end of the positioning rod is respectively screwed to a pair of limit nuts. The upper end of the support frame or the positioning frame is also clamped between the pair of limit nuts.

[0013] The positioning frame is also screwed to a locking bolt, which is used to switch the state between the positioning frame and the base between stationary and sliding states.

[0014] The cross-section of the guide rail is an isosceles trapezoid with one end smaller than the other.

[0015] The beneficial effects of this utility model are as follows: When the stator bars of a hydro-generator unit need to be bent using the technical solution provided by this utility model, the stator bars are first clamped between the idler roller and the pressure roller. The relative horizontal distance between the positioning frame and the support frame is read according to the main scale line. Then, the distance that the sliding frame should be lifted is calculated according to the preset angle that the stator bars need to be bent to. Thus, a rotational torque is applied to the dial, and by observing the secondary scale line, the sliding frame is lifted from the base surface to the predetermined lifting position, so that the bending angle of the stator bars of the hydro-generator unit reaches the preset design requirements. Attached Figure Description

[0016] Figure 1 This is an isometric drawing of this utility model;

[0017] Figure 2 This is a top view of the present invention;

[0018] Figure 3 This utility model is along Figure 2 A sectional view cut along plane AA.

[0019] Figure 4 This utility model is along Figure 2 A sectional view cut along plane AA.

[0020] In the diagram: 1-base, 2-bending assembly, 3-bending guide assembly, 4-support frame, 5-sliding frame, 6-positioning frame, 7-guide rail, 8-limiting groove, 9-dial, 10-pull rod, 11-support roller, 12-pressure roller, 13-positioning rod, 14-limiting nut, 15-locking bolt. Detailed Implementation

[0021] The technical solution of this utility model will be further described below with reference to the accompanying drawings, but the scope of protection claimed is not limited to the description.

[0022] This utility model provides a device for bending the stator bars of a hydro-generator set, such as... Figures 1 to 4 As shown, the device includes a base 1, a bending clamping assembly 2, and a pair of bending guide assemblies 3. The bending clamping assembly 2 includes a support frame 4 and a sliding frame 5. The bending guide assembly 3 includes a positioning frame 6. The pair of bending guide assemblies 3 are arranged on the front and rear sides of the bending clamping assembly 2. The base 1 is fixedly connected to the lower end of the support frame 4. The upper end of the support frame 4 extends upward in the vertical direction. The support frame 4 is also fixedly connected to a guide rail 7. The left and right sides of the sliding frame 5 are fitted onto the guide rail 7. The surface of the base 1 is also provided with several main scale lines, which are used to mark the relative horizontal distance between the positioning frame 6 and the support frame 4. The surface of the support frame 4 is also provided with several secondary scale lines, which are used to mark the relative height distance between the sliding frame 5 and the base 1.

[0023] Using the technical solution provided by this utility model, when it is necessary to bend the stator bars of a hydro-generator unit, the stator bars are first clamped between the idler roller and the pressure roller. The relative horizontal distance between the positioning frame and the support frame is read according to the main scale line. Then, according to the preset angle that the stator bars need to be bent to, the distance that the sliding frame should be lifted is calculated. Thus, a rotational torque is applied to the dial, and by observing the secondary scale line, the sliding frame is lifted from the base surface to the predetermined lifting position, so that the bending angle of the stator bars of the hydro-generator unit reaches the preset design requirements.

[0024] Specifically, the distance between any two adjacent main scale lines is 1 mm. The distance between any two adjacent secondary scale lines is 1 mm. Compared to existing technologies, by adopting the technical solution of this utility model, the operator can observe the main and secondary scale lines to ensure that the stator bars of the hydro-generator unit achieve the pre-designed bending angle, thus improving bending accuracy.

[0025] In addition, the surface of the base 1 is provided with a limiting groove 8, and the bottom of the positioning frame 6 fits into the limiting groove 8. Preferably, the cross-section of the limiting groove 8 is a dovetail groove shape with a smaller upper end and a larger lower end. By adopting the technical solution of this utility model, a dovetail groove-shaped fitting structure is set between the base and the positioning frame, which helps to reduce the fitting error between the base and the positioning frame and improve the accuracy of the bending angle of the stator bars of the hydro-generator unit.

[0026] In addition, the bending assembly 2 also includes a dial 9, which is mounted on the support frame 4 using rolling bearings. The slider is also fixedly connected to one end of the pull rod 10, and the other end of the pull rod 10 is screwed to the dial 9. The dial 9 can be replaced by a hexagonal nut. Both the bending assembly 2 and the guide bending assembly 3 include a support roller 11, a pressure roller 12, and a positioning rod 13. The left and right sides of the support roller 11 are hinged to the positioning frame 6 or the support frame 4. The left and right sides of the pressure roller 12 are respectively hinged to one end of the positioning rod 13, and the other end of the positioning rod 13 is screwed to a pair of limit nuts 14. The upper end of the support frame 4 or the positioning frame 6 is also clamped between the pair of limit nuts 14.

[0027] Specifically, the positioning frame 6 is also screwed to the locking bolt 15, which is used to switch the state between the positioning frame 6 and the base 1 between stationary and sliding states. The cross-section of the guide rail 7 is an isosceles trapezoid with one end smaller than the other.

Claims

1. A stator bar bending device for a hydro-generator set, characterized in that: The device includes a base (1), a bending assembly (2), and a pair of guide bending assemblies (3). The bending assembly (2) includes a support frame (4) and a sliding frame (5). The guide bending assembly (3) includes a positioning frame (6). The pair of guide bending assemblies (3) are arranged on the front and rear sides of the bending assembly (2). The base (1) is fixedly connected to the lower end of the support frame (4). The upper end of the support frame (4) extends upward in the vertical direction. The support frame (4) is also fixedly connected to a guide rail (7). The left and right sides of the sliding frame (5) are fitted onto the guide rail (7). The surface of the base (1) is also provided with several main scale lines. The main scale lines are used to mark the relative horizontal distance between the positioning frame (6) and the support frame (4). The surface of the support frame (4) is also provided with several secondary scale lines. The secondary scale lines are used to mark the relative height distance between the sliding frame (5) and the base (1).

2. The stator bar bending device for a hydro-generator set as described in claim 1, characterized in that: The distance between any two adjacent main scale lines is 1 mm.

3. The stator bar bending device for a hydro-generator set as described in claim 1, characterized in that: The distance between any two adjacent sub-scale lines is 1 mm.

4. The stator bar bending device for a hydro-generator set as described in claim 1, characterized in that: The surface of the base (1) is also provided with a limiting groove (8), and the bottom of the positioning frame (6) fits into the limiting groove (8).

5. The stator bar bending device for a hydro-generator set as described in claim 4, characterized in that: The cross-section of the limiting groove (8) is a dovetail groove shape with a smaller upper end and a larger lower end.

6. The stator bar bending device for a hydro-generator set as described in claim 1, characterized in that: The bending assembly (2) also includes a dial (9), which is mounted on the support frame (4) using a rolling bearing. The slide frame (5) is also fixedly connected to one end of the pull rod (10), and the other end of the pull rod (10) is screwed to the dial (9).

7. The stator bar bending device for a hydro-generator set as described in claim 6, characterized in that: The dial (9) can be replaced by a hexagonal nut.

8. The stator bar bending device for a hydro-generator set as described in claim 1, characterized in that: Both the bending assembly (2) and the guiding assembly (3) include a roller (11), a pressure roller (12), and a positioning rod (13). The left and right sides of the roller (11) are hinged to the positioning frame (6) or the support frame (4). The left and right sides of the pressure roller (12) are respectively hinged to one end of the positioning rod (13). The other end of the positioning rod (13) is screwed to a pair of limiting nuts (14). The upper end of the support frame (4) or the positioning frame (6) is also clamped between the pair of limiting nuts (14).

9. The stator bar bending device for a hydro-generator set as described in claim 1, characterized in that: The positioning frame (6) is also screwed to a locking bolt (15), which is used to switch the state between the positioning frame (6) and the base (1) between stationary and sliding.

10. The stator bar bending device for a hydro-generator set as described in claim 1, characterized in that: The cross-section of the guide rail (7) is an isosceles trapezoid with one end smaller than the other.

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