Auxiliary lifting device for steam turbine installation

Abstract

The utility model discloses an auxiliary lifting device for steam turbine installation, and relates to the technical field of steam turbine installation equipment, the auxiliary lifting device comprises a hanging bracket and a crane hook, a first screw rod and a second screw rod are arranged in the middle of the hanging bracket side by side, and the first screw rod and the second screw rod are both rotatably connected with the hanging bracket; the opposite ends of the first lead screw and the second lead screw are each provided with a first bevel gear, a second bevel gear is arranged between the two first bevel gears, the second bevel gear is engaged with the two first bevel gears, and the second bevel gear is fixedly connected with a motor output shaft installed at the bottom of the hanging bracket. The first lead screw, the second lead screw, the first bevel gear, the second bevel gear, the motor, the walking wheels and the U-shaped plate are matched with one another, the distance between the two soft lifting belts at the bottom of the lifting frame can be adjusted so as to meet the auxiliary lifting requirements of steam turbine rotors of different sizes, and compared with the prior art, the lifting device is wider in application range and higher in practicability. And the practicability is higher.

Description

Technical Field

[0001] This utility model relates to the technical field of steam turbine installation equipment, specifically an auxiliary lifting device for steam turbine installation. Background Technology

[0002] A steam turbine, also known as a steam engine, is a rotary steam power unit. High-temperature, high-pressure steam passes through a fixed nozzle, becomes an accelerated airflow, and is then injected onto the blades, causing the rotor, which is equipped with rows of blades, to rotate and perform work. During the installation of a steam turbine, the main requirement is to precisely install the rotor inside its matching casing. However, because the rotor blades need to be precisely and tightly aligned with the installation positions / slots on the casing (horizontal alignment is necessary for accurate insertion), and because there is a lack of installation space on the casing to accommodate installation tools, traditional installation methods essentially involve simply lifting the rotor above the casing. However, existing steam turbine rotor lifting ropes are usually fixed to the rotor journal (as shown in the instruction manual). Figure 4 (As shown in the provided physical image), this is safer because the spacing between the two lifting ropes on the lifting device cannot be continuously adjusted; they can only be attached to the two ends of the lifting device. However, in reality, the length of a steam turbine rotor varies depending on the turbine's specifications (the length of a steam turbine rotor varies depending on the model and application scenario; generally, its length ranges from 1 to 10 meters). The journal positions of different sized steam turbine rotors are different, which means that the existing lifting device cannot adapt well to the lifting of steam turbine rotors of different sizes. The lifting ropes are prone to tilting and thus come into contact with the steam turbine, resulting in greater wear on the lifting ropes at the point of contact, which in turn increases the risk of the lifting ropes breaking at the point of contact, making the lifting unsafe. Utility Model Content

[0003] The purpose of this utility model is to provide an auxiliary lifting device for turbine installation, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] An auxiliary lifting device for turbine installation includes a frame and a crane hook. A first lead screw and a second lead screw are arranged side-by-side in the middle of the frame, both rotatably connected to the frame. A first helical gear is mounted on the opposite end of each lead screw and the first helical gear is positioned between the two first helical gears, meshing with each of the two first helical gears. The second helical gear is fixedly connected to a motor output shaft mounted at the bottom of the frame. A slider is mounted on each of the first and second lead screws. U-shaped plates are fixedly mounted on both sides of the sliders. A traveling wheel is mounted in the middle of the upper part of each U-shaped plate. First hanging rods are mounted on both sides of each U-shaped plate. Flexible lifting straps are suspended from the two first hanging rods, with a turbine rotor suspended from the bottom of each flexible lifting strap. Two hanging plates are installed correspondingly at the front and rear of the middle of the frame. Second hanging rods are mounted on the hanging plates. Lifting ropes are arranged between the second hanging rods and the crane hook, suspending the ropes from the crane hook and the second hanging rods respectively.

[0006] As a further improvement of this utility model, the threads of the first lead screw and the second lead screw have the same direction.

[0007] As a further improvement of this utility model, the hanger is provided with wheel grooves for use with the traveling wheels.

[0008] As a further improvement of this utility model, the end diameters of the free ends of both the first and second hanging rods are larger than the diameter of the rod body.

[0009] As a further improvement of this utility model, the two ends of the flexible lifting sling and the two ends of the lifting rope are fixed together.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] 1. This utility model, through the cooperation of a first lead screw, a second lead screw, a first helical gear, a second helical gear, a motor, a traveling wheel, and a U-shaped plate, can adjust the distance between the two flexible lifting straps at the bottom of the hanger to adapt to the auxiliary lifting needs of turbine rotors of different lengths. Compared with existing auxiliary lifting devices, the distance between the two flexible lifting straps of this utility model can be adaptively adjusted according to the length of the turbine rotor, with a wider range of applications. It can effectively prevent the flexible lifting straps from tilting and rubbing against the turbine during use, thus improving the safety of auxiliary lifting.

[0012] 2. This utility model incorporates a flexible lifting sling made of synthetic fiber. Compared to steel wire rope, the flexible lifting sling is more stable, and its stress can be adjusted to avoid accidents caused by uneven stress. This ensures stable rotor lifting while preventing damage to the turbine rotor caused by direct friction between the traditional steel wire rope and the turbine rotor, which would affect its use. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of an auxiliary lifting device for turbine installation.

[0014] Figure 2 This is a partial front sectional view of an auxiliary lifting device for turbine installation.

[0015] Figure 3 An auxiliary lifting device for steam turbine installation Figure 1 Cross-sectional view of the middle rope loop.

[0016] Figure 4 A physical example of an auxiliary lifting device installed on an existing steam turbine. Figure 1 .

[0017] Figure 5 A physical example of an auxiliary lifting device installed on an existing steam turbine. Figure 2 .

[0018] 1. Hanger; 2. First lead screw; 3. Second lead screw; 4. First helical gear; 5. Motor; 6. Second helical gear; 7. Slider; 8. U-shaped plate; 9. Traveling wheel; 10. First hanging rod; 11. Flexible lifting belt; 12. Steam turbine rotor; 13. Second hanging rod; 14. Hanging plate; 15. Lifting rope; 16. Crane hook; 17. Wheel groove. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figures 1-2In this embodiment of the present invention, an auxiliary lifting device for turbine installation includes a hanger 1 and a crane hook 16. A first lead screw 2 and a second lead screw 3 are arranged side-by-side in the middle of the hanger 1. Both the first lead screw 2 and the second lead screw 3 are rotatably connected to the hanger 1. A first helical gear 4 is installed on the opposite end of each of the first lead screw 2 and the second lead screw 3. A second helical gear 6 is arranged between the two first helical gears 4, and the second helical gear 6 meshes with both first helical gears 4 respectively. The second helical gear 6 is fixedly connected to the output shaft of a motor 5 installed at the bottom of the hanger 1. The first lead screw 2 and... Each of the second lead screws 3 is equipped with a slider 7. U-shaped plates 8 are fixedly installed on both sides of the slider 7. A traveling wheel 9 is installed in the middle of the upper part of the U-shaped plate 8. First hanging rods 10 are installed on both sides of the U-shaped plate 8. Flexible lifting belts 11 are suspended on the two first hanging rods 10. A steam turbine rotor 12 is suspended at the bottom of the flexible lifting belts 11. Two hanging plates 14 are installed in the middle of the frame 1, corresponding to each other. Second hanging rods 13 are installed on the hanging plates 14. A lifting rope 15 is set between the second hanging rod 13 and the crane hook 16. The lifting rope 15 is suspended on the crane hook 16 and the second hanging rod 13 respectively.

[0021] The first lead screw 2 and the second lead screw 3 have the same thread direction. This design allows the motor 5 to drive the first lead screw 2 and the second lead screw 3 to rotate in different directions, so that the first lead screw 2 and the second lead screw 3 indirectly drive the two flexible lifting slings 11 to rotate in opposite directions, thereby achieving the adjustment of the distance between the two flexible lifting slings 11.

[0022] The hanger 1 has a wheel groove 17 for use with the traveling wheel 9. The wheel groove 17 can limit the traveling wheel 9 so that the traveling wheel 9 can only travel in a straight line.

[0023] The diameter of the free ends of the first hanging rod 10 and the second hanging rod 13 is larger than the diameter of the rod body. This design can prevent the soft lifting sling 11 from slipping off the first hanging rod 10 or the lifting rope 15 from slipping off the second hanging rod 13.

[0024] Both ends of the flexible lifting sling 11 and both ends of the lifting rope 15 are fixed together. This design makes it easy to hang the flexible lifting sling 11 and the lifting rope 15 on the first hanging rod 10 and the second hanging rod 13, respectively.

[0025] The flexible lifting sling 11 is made of synthetic fiber. Compared with steel wire rope, the flexible lifting sling 11 is more stable, and the force of the flexible lifting sling 11 can be adjusted to avoid accidents caused by uneven force. While ensuring the stability of rotor lifting, it avoids the direct friction between the traditional steel wire rope and the turbine rotor 12, which would cause the turbine rotor 12 to be worn and affect its use. The existing turbine rotor 12 will shake during the lifting process. During the use of traditional lifting devices, the steel wire rope will generate a lot of friction with the turbine rotor 12 during the shaking process, which will easily cause a lot of wear on the surface of the turbine rotor 12 and adversely affect the normal use of the turbine rotor 12.

[0026] The working principle of this utility model is as follows:

[0027] In use, first use two ropes 15 to suspend the frame 1 on the crane hook 16, then start the motor 5. The motor 5 drives the second helical gear 6 to rotate. The second helical gear 6 meshes with the two first helical gears 4 to drive the two first helical gears 4 to rotate. The two first helical gears 4 drive the first lead screw 2 and the second lead screw 3 to rotate respectively. The first lead screw 2 and the second lead screw 3 drive the traveling wheel 9 on the U-shaped plate 8 to roll along the wheel groove 17 above the frame 1 through the slider 7, thereby driving the two U-shaped plates 8 to slide in opposite directions, realizing the adjustment of the distance between the two flexible lifting straps 11, so that the flexible lifting straps 11 are in a vertical state when suspended at the neck of the turbine rotor 12. Then, the flexible lifting straps 11 are suspended on both ends of the turbine rotor 12 to realize the auxiliary lifting and lowering of the turbine rotor 12, thereby facilitating the installation of the turbine rotor 12.

[0028] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An auxiliary lifting device for turbine installation, comprising a lifting frame (1) and a crane hook (16), characterized in that: The hanger (1) has a first lead screw (2) and a second lead screw (3) arranged side by side in the middle. Both the first lead screw (2) and the second lead screw (3) are rotatably connected to the hanger (1). A first helical gear (4) is installed on the opposite end of the first lead screw (2) and the second lead screw (3). A second helical gear (6) is arranged between the two first helical gears (4), and the second helical gear (6) meshes with the two first helical gears (4) respectively. The second helical gear (6) is fixedly connected to the output shaft of the motor (5) installed at the bottom of the hanger (1). A slider (7) is installed on both the first lead screw (2) and the second lead screw (3). The two sliders (7) have two... A U-shaped plate (8) is fixedly installed on each side. A traveling wheel (9) is installed in the middle of the upper part of the U-shaped plate (8). A first hanging rod (10) is installed on both sides of the U-shaped plate (8). A flexible lifting belt (11) is suspended on the two first hanging rods (10). A steam turbine rotor (12) is suspended at the bottom of the flexible lifting belt (11). Two hanging plates (14) are installed in the middle of the frame (1) in front and behind. A second hanging rod (13) is installed on the hanging plate (14). A lifting rope (15) is set between the second hanging rod (13) and the crane hook (16). The lifting rope (15) is suspended on the crane hook (16) and the second hanging rod (13) respectively.

2. The auxiliary lifting device for turbine installation according to claim 1, characterized in that: The first lead screw (2) and the second lead screw (3) have the same thread direction.

3. The auxiliary lifting device for turbine installation according to claim 1, characterized in that: The hanger (1) has a wheel groove (17) for use with the traveling wheel (9).

4. The auxiliary lifting device for turbine installation according to claim 1, characterized in that: The end diameters of the free ends of the first hanging rod (10) and the second hanging rod (13) are both greater than the diameter of the rod body.

5. The auxiliary lifting device for turbine installation according to claim 1, characterized in that: The two ends of the flexible lifting sling (11) and the two ends of the lifting rope (15) are fixed together.

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