Installation device and method for turbine main shaft

Abstract

A turbine main shaft installation device and method includes a bracket installed outside the main shaft, and two sets of clamping assemblies surrounding the main shaft. Each clamping assembly includes a sleeve surrounding the main shaft, the upper end of which has a tapered opening. Multiple trapezoidal tiles are inserted between the upper opening of the sleeve and the main shaft, forming an inclined fit between the tiles and the sleeve. A lifting plate extends outward from the upper end of the tiles. A countersunk hole is formed on the sleeve below the lifting plate, and a piston is installed within the countersunk hole. A rod is fixedly connected to the piston, with its upper end abutting against the lifting plate. The lower end of the countersunk hole is connected to a hydraulic oil pipe. The lower end of the sleeve has a skirt, and the two skirts in the two sets of clamping assemblies are connected by multiple first hydraulic cylinders. This invention addresses the problem that during turbine main shaft installation, the main shaft is prone to misalignment of the shaft hole, leading to assembly failure or scratching of the shaft hole.

Description

Technical Field

[0001] This invention relates to a device and method for installing the main shaft of a water turbine. Background Technology

[0002] After the turbine main shaft is hoisted into place by crane, it needs to be temporarily secured. Then, based on the main shaft's position, workers install and adjust components such as bearings, couplings, and nozzles below the main shaft. After installation and adjustment, the main shaft is lowered. The current method for temporarily securing the main shaft is to use a fixing fixture, while using four hand-operated hoists to hold the main shaft for double safety. When it is necessary to lower the main shaft, the fixing fixture is first removed, and four workers control the hand-operated hoists to lower the main shaft. However, in actual operation, it is difficult to ensure that the lowering speed of the four hand-operated hoists is consistent, which may cause the main shaft to deviate from the shaft hole, resulting in assembly failure or the main shaft scratching the shaft hole. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a turbine main shaft installation device and method to solve the problem that the main shaft is prone to misalignment during turbine main shaft installation, which leads to assembly failure or scratching of the main shaft hole.

[0004] To solve the above problems, the technical solution of the present invention is as follows:

[0005] The turbine main shaft mounting device includes a bracket installed outside the main shaft. Two sets of clamping assemblies are fitted around the main shaft. Each clamping assembly includes a sleeve fitted around the main shaft. The upper end of the sleeve is tapered. Multiple trapezoidal tiles are inserted between the upper end of the sleeve and the main shaft, forming an inclined fit between the tiles and the sleeve. Lifting plates extend outward from the upper ends of the tiles. A countersunk hole is provided on the sleeve below the lifting plates. A piston is installed in the countersunk hole, and a rod is fixedly connected to the piston. The upper end of the rod abuts against the lifting plates. The lower end of the countersunk hole is connected to a hydraulic oil pipe. The lower end of the sleeve has a skirt. The two skirts in the two sets of clamping assemblies are connected by multiple first hydraulic cylinders.

[0006] The bracket includes a support ring that is sleeved outside the main shaft. The support ring is fixedly connected to the base plate by multiple inclined plates. Multiple corner plates are fixedly connected to the edge of the support ring. Each corner plate is evenly distributed around the axis of the support ring. A second hydraulic cylinder is provided between the corner plate and the skirt.

[0007] A groove is provided on the bottom surface of the lifting plate, and a slider is provided in the groove. The upper end of the rod is fixedly connected to the slider.

[0008] Lubricating oil is applied to the surface of the support ring.

[0009] It also includes a cross, which is inlaid with multiple magnets, and the center of the cross is connected to a plumb bob by a flexible rope.

[0010] The installation method for the turbine main shaft includes the following steps:

[0011] Step 1: Hoist the spindle through the clamping assembly and bracket;

[0012] Step 2: Tap each tile downwards to make it stick to the main shaft. The two sets of clamping components clamp and lock the main shaft, and the crane separates from the main shaft.

[0013] Step 3: When the spindle needs to be installed, pump hydraulic oil into the countersunk hole in the lower clamping assembly. The upward piston pushes the plate out of the sleeve to release the spindle. Then the first cylinder retracts and the spindle falls vertically.

[0014] Step 4: During the process of the spindle falling, observe the horizontal position of the spindle through the plumb bob and flexible rope. If there is a deviation in position, the first hydraulic cylinder stops, and at the same time, the lower clamping assembly clamps and locks the spindle. Then, hydraulic oil is pumped into the second hydraulic cylinder, which pushes the lower clamping assembly to move to adjust the horizontal position of the spindle.

[0015] Step 5: After the spindle position is adjusted, the first hydraulic cylinder drives the spindle to fall. If the spindle has not moved to the installation position when the first hydraulic cylinder reaches the lower stroke position, the lower clamping assembly locks the spindle, and the upper clamping assembly releases the spindle. Then the first hydraulic cylinder extends to the upper stroke position, and the upper clamping assembly locks the spindle, and the lower clamping assembly releases the spindle. The first hydraulic cylinder drives the spindle to fall again, and this cycle repeats until the spindle falls to the installation position.

[0016] The beneficial effects of this invention are as follows: This invention enables the spindle to fall vertically and slowly, ensuring the assembly accuracy of the spindle and preventing damage between the spindle and other components. It also has a clamping component with a self-locking function to prevent the spindle from falling, thus improving the safety and reliability during assembly. In addition, it can make fine adjustments to the horizontal position of the spindle, enabling precise assembly. Furthermore, the device has a simple structure and is easy to manufacture and process. Attached Figure Description

[0017] The invention will be further described below with reference to the accompanying drawings:

[0018] Figure 1 This is a partial cross-sectional structural diagram of the present invention.

[0019] Figure 2 This is a partial structural diagram of the present invention.

[0020] Figure 3 for Figure 1 The structural diagram shown in AA.

[0021] Figure 4A schematic diagram of the main view structure of the cross for the invention.

[0022] In the diagram: 1. Main spindle; 2. Clamping assembly; 3. First hydraulic cylinder; 5. Second hydraulic cylinder; 6. Bracket; 7. Floor slab; 8. Magnet; 9. Cross; 10. Rangefinder; 11. Plumb bob; 12. Bushing; 13. Flexible rope; 20. Skirt; 21. Lifting plate; 22. Slider; 23. Slide; 24. Tile; 25. Pipe sleeve; 26. Rod; 27. Piston; 28. Countersunk hole; 29. ​​Hydraulic oil pipe; 61. Angle plate; 62. Inclined plate; 63. Foot plate; 64. Support ring. Detailed Implementation

[0023] like Figures 1 to 4 As shown, the turbine main shaft mounting device includes a bracket 6 installed outside the main shaft 1. Two sets of clamping assemblies 2 are fitted around the main shaft 1. Each clamping assembly 2 includes a sleeve 25 fitted around the main shaft 1. The upper end of the sleeve 25 is tapered. Multiple right-angled trapezoidal arc-shaped tiles 24 are inserted between the upper end of the sleeve 25 and the main shaft 1. The tiles 24 and the sleeve 25 form an inclined surface fit. When the tiles 24 move upward, they release the main shaft 1; when they move downward, they lock the main shaft 1. A lifting plate 21 extends outward from the upper end of the tiles 24. An opening is located on the sleeve 25 below the lifting plate 21. A countersunk hole 28 is provided, and a piston 27 is installed inside the countersunk hole 28. A rod 26 is fixedly connected to the piston 27. The countersunk hole 28, piston 27, and piston rod 27 constitute a single-acting hydraulic cylinder. The upper end of the rod 26 abuts against the lifting plate 21. The lower end of the countersunk hole 28 is connected to a hydraulic oil pipe, which is connected to a hydraulic station. The hydraulic station pumps hydraulic oil into the countersunk hole 28 to drive the piston 27 upward. The upward piston 27 pushes the tile 24 out of the upper end of the sleeve 25 through the rod 26. The lower end of the sleeve 25 has a skirt 20. The two skirts 20 in the two sets of clamping assemblies 2 are connected by multiple first hydraulic cylinders 3. The two sets of clamping assemblies 2 clamp and release the spindle 1. At the same time, in conjunction with the first hydraulic cylinders 3, the spindle 1 can be vertically raised and lowered to ensure the assembly accuracy of the spindle 1.

[0024] The bracket 6 includes a horizontal support ring 64 that is outer sleeved around the main shaft 1. The support ring 64 is fixedly connected to the base plate 63 via multiple inclined plates 62. Multiple corner plates 61 are fixedly connected to the edge of the support ring 64, and the corner plates 61 are evenly distributed around the axis of the support ring 64. A second hydraulic cylinder 5 is provided between the corner plates 61 and the skirt 20. The second hydraulic cylinder 5 pushes the lower clamping assembly 2 to finely adjust the horizontal position of the main shaft 1.

[0025] A groove 23 is provided on the bottom surface of the lifting plate 21, and a slider 22 is provided inside the groove 23. The upper end of the rod 26 is fixedly connected to the slider 22. The groove 23 and the slider 22 are used to limit the position of the tile 24 and prevent the tile 24 from detaching from the rod 26.

[0026] Lubricating oil is applied to the surface of the support ring 64 to facilitate the displacement of the main shaft 1 by the second hydraulic cylinder 5.

[0027] It also includes a cross 9, on which multiple magnets 8 are embedded. The center of the cross 9 is connected to the plumb bob 11 via a flexible rope 13. The length of the cross 9 is the same as the diameter of the lower end face of the main shaft 1. The four corners of the cross 9 are respectively abutted against the lower edge of the main shaft 1 to ensure that the flexible rope 13 and the plumb bob 11 are on the axis of the main shaft 1, which makes it convenient for workers to measure coaxiality and facilitate the assembly of the main shaft 1.

[0028] The installation method for the turbine main shaft 1 includes the following steps:

[0029] Initially, the bracket 6 is installed on top, and then the level of the support ring 64 is measured using a spirit level. Next, the support ring 64 is adjusted to be level by adding or removing shims between the base plate 63 and the support ring 64. Then, the two sets of clamping components 2 and the first hydraulic cylinder 3 are installed.

[0030] Step 1: The crane lifts the main shaft 1 through the clamping assembly 2 and the bracket 6;

[0031] Step 2: Tap each tile 24 downwards to make each tile 24 stick to the main shaft 1. The two sets of clamping components 2 clamp and lock the main shaft 1, and the crane is separated from the main shaft 1 to avoid occupying the crane for a long time.

[0032] Step 3: When it is necessary to install the spindle 1, pump hydraulic oil into the countersunk hole 28 in the lower clamping assembly 2, and push the plate 24 out of the sleeve 25 by the upward piston 27 to release the spindle 1. Then the first cylinder 3 retracts and drops the spindle 1 vertically.

[0033] Step 4: During the descent of spindle 1, observe its horizontal position using plumb bob 11 and flexible rope 13. The measurement method is as follows: Figure 1 As shown, the flexible rope 13 and the plumb bob 11 are lowered into the bushing. Then, the distance between the inner wall of the bushing and the flexible rope 13 is measured using the rangefinder 10. If there is a positional deviation, the first cylinder 3 stops, and the lower clamping assembly 2 clamps and locks the main shaft 1. Then, hydraulic oil is pumped into the second cylinder 5, and the second cylinder 5 pushes the lower clamping assembly 2 to move, so as to adjust the horizontal position of the main shaft 1.

[0034] Step 5: After the spindle 1 position is adjusted, the first hydraulic cylinder 3 drives the spindle 1 to fall. If the spindle 1 still has not moved to the installation position when the first hydraulic cylinder 3 reaches the lower stroke position, the lower clamping component 2 locks the spindle 1, and the upper clamping component 2 releases the spindle 1. Then the first hydraulic cylinder 3 extends to the upper stroke position, and then the upper clamping component 2 locks the spindle 1, and the lower clamping component 2 releases the spindle 1. The first hydraulic cylinder 3 drives the spindle 1 to fall again, and this cycle repeats until the spindle 1 falls to the installation position.

Claims

1. A turbine main shaft mounting device, characterized in that: The system includes a bracket (6) installed outside the main shaft (1), and two sets of clamping assemblies (2) are installed on the main shaft (1). The clamping assembly (2) includes a sleeve (25) installed outside the main shaft (1). The upper end of the sleeve (25) is tapered. Multiple trapezoidal tiles (24) are inserted between the upper end of the sleeve (25) and the main shaft (1). The tiles (24) and the sleeve (25) form a beveled fit. The upper end of the tiles (24) extends outward to form a lifting plate (21). A countersunk hole (28) is provided on the sleeve (25) below the lifting plate (21). A piston (27) is provided in the countersunk hole (28). A rod (26) is fixedly connected to the piston (27). The upper end of the rod (26) abuts against the lifting plate (21). The lower end of the countersunk hole (28) is connected to the hydraulic oil pipe. The lower end of the sleeve (25) has a skirt (20). The two skirts (20) in the two sets of clamping assemblies (2) are connected by multiple first oil cylinders (3).

2. The turbine main shaft mounting device according to claim 1, characterized in that: The bracket (6) includes a support ring (64) that is sleeved outside the main shaft (1). The support ring (64) is fixedly connected to the foot plate (63) through multiple inclined plates (62). Multiple corner plates (61) are fixedly connected to the edge of the support ring (64). Each corner plate (61) is evenly distributed around the axis of the support ring (64). A second oil cylinder (5) is provided between the corner plate (61) and the skirt (20).

3. The turbine main shaft mounting device according to claim 2, characterized in that: A groove (23) is provided on the bottom surface of the lifting plate (21), and a slider (22) is provided in the groove (23). The upper end of the rod (26) is fixedly connected to the slider (22).

4. The turbine main shaft mounting device according to claim 2, characterized in that: Lubricating oil is applied to the surface of the support ring (64).

5. The turbine main shaft mounting device according to claim 2, characterized in that: It also includes a cross (9), which is inlaid with multiple magnets (8), and the center of the cross (9) is connected to a plumb bob (11) by a flexible rope (13).

6. A method for using the turbine main shaft mounting device according to claim 5, characterized in that: Includes the following steps: Step 1: Hoist the main shaft (1) through the clamping assembly (2) and the bracket (6), and install the cross (9) on the lower end face of the main shaft (1), so that the four corners of the cross (9) abut against the lower edge of the main shaft (1) to ensure that the flexible rope (13) and the plumb bob (11) are on the axis of the main shaft (1); Step 2: Tap each tile (24) downwards to make each tile (24) stick to the main shaft (1). The two sets of clamping components (2) clamp and lock the main shaft (1), and the crane separates from the main shaft (1). Step 3: When it is necessary to install the spindle (1), pump hydraulic oil into the countersunk hole (28) in the lower clamping assembly (2), and push the plate (24) out of the sleeve (25) by the upward piston (27) to release the spindle (1). Then the first cylinder (3) retracts and drops the spindle (1) vertically. Step 4: During the process of the main shaft (1) falling, observe the horizontal position of the main shaft (1) through the plumb bob (11) and the flexible rope (13). If the position is deviated, the first oil cylinder (3) will stop, and at the same time the lower clamping assembly (2) will clamp and lock the main shaft (1). Then, hydraulic oil will be pumped into the second oil cylinder (5), and the second oil cylinder (5) will push the lower clamping assembly (2) to move to adjust the horizontal position of the main shaft (1). Step 5: After the spindle (1) position is adjusted, the first cylinder (3) drives the spindle (1) to fall. If the spindle (1) still has not moved to the installation position when the first cylinder (3) moves down to the lower stroke position, the lower clamping component (2) locks the spindle (1) and the upper clamping component (2) releases the spindle (1). Then the first cylinder (3) extends to the upper stroke position, and then the upper clamping component (2) locks the spindle (1) and the lower clamping component (2) releases the spindle (1). The first cylinder (3) drives the spindle (1) to fall again. This cycle is repeated until the spindle (1) falls to the installation position.

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