Nuclear power low-pressure rotor hoisting device

Abstract

The utility model discloses a nuclear power low pressure rotor hoist device, including the crane beam, first fixed pulley, second fixed pulley, first operation rope, second operation rope, first high strength cable and second high strength cable, and the first hoisting mechanism and second hoisting mechanism are equipped with on the crane beam interval, and the first hoisting mechanism includes two first hoisting subassembly, and the first hoisting subassembly includes the first locating plate, and the first locating plate is equipped with the first locating protruding and first lap joint portion, and the second hoisting mechanism includes two second hoisting subassembly, and the second hoisting subassembly includes the second locating plate, and the second locating plate is equipped with the second locating protruding and second lap joint portion. Its effective solution related technique must turn out low pressure rotor before and after the bearing lower half can only put into the problem of the steel wire rope of hoisting low pressure rotor, and effectively avoided the risk of journal scratch, solved the nuclear power low pressure rotor and placed on the fixed support and removed or hung up hoist rope difficult problem, effectively reduced hoisting operation industrial safety risk.

Description

Technical Field

[0001] This utility model relates to the field of nuclear power technology, and in particular to a nuclear power low-pressure rotor lifting device. Background Technology

[0002] The HN1000-6.43 single-shaft, three-cylinder, four-exhaust condensing half-speed nuclear power turbine has a single low-pressure rotor length of 11.5 meters. The low-pressure cylinder rotor blades are reaction stage blades, with stages 1 to 9 having self-contained crown blades, and the last stage having free-type (unstiffened) blades. The length of the last stage blades after installation is approximately 1396 mm, and the rotor weight is 230 t (with blades).

[0003] Due to the excessive weight of the low-pressure rotor (230T), the manufacturer's lifting solution was to use a φ66mm steel wire rope. However, because of the compact internal structure of the bearing housing of this type of unit, after removing the lower half of the outer oil baffles on both sides of the low-pressure cylinder bearing housing, the width of the steel wire rope for lifting the low-pressure rotor was only 75mm. Therefore, the lower half of the front and rear bearings of the low-pressure rotor had to be flipped out to insert the steel wire rope for lifting the low-pressure rotor. To prevent scratching the journals, the original design required a 6mm thick copper plate to be used as a shim during lifting.

[0004] The existing lifting equipment has the following four problems when used:

[0005] A: The φ66mm steel wire rope coil supplied by the factory is too heavy and needs to be moved using a crane.

[0006] B: The bearing housings on both sides of the low-pressure cylinder have a compact internal structure. After removing the outer oil baffle, the distance between the bearing housing and the low-pressure rotor is only 75mm. The wire rope for lifting the low-pressure rotor cannot be threaded through; the lower half of the front and rear bearing shells of the low-pressure rotor must be flipped out before the wire rope can be threaded through.

[0007] C: The wire rope used to lift the low-pressure rotor must not be in direct contact with the journal (otherwise it will scratch the journal), and a 6mm thick copper plate must be placed underneath.

[0008] D: Because the final stage wheel of the low-pressure rotor reaches φ5.7 meters, scaffolding must be erected to place the low-pressure rotor on the low-pressure rotor support, and a crane or similar equipment must be used to remove the low-pressure rotor wire rope from the lifting point of the lifting beam.

[0009] This has the following impacts: It increases the workload of the crane operator. It adds extra work for bearing replacement, extending the overhaul period by more than three days. It adds the step of shimming with copper plates, which can easily lead to journal scratches. Removing and suspending the wire rope is difficult, increasing the risk of industrial safety hazards. Utility Model Content

[0010] The technical problem to be solved by this utility model is to provide a lifting device for low-pressure rotors in nuclear power plants, which solves the problem in related technologies that the lower half of the front and rear bearings of the low-pressure rotor must be turned out before the wire rope for lifting the low-pressure rotor can be put in, and solves the safety problem in related technologies such as the low-pressure rotor journal being easily damaged.

[0011] The technical solution adopted by this utility model to solve its technical problem is: to construct a nuclear power low-pressure rotor lifting device, including a lifting beam, a first fixed pulley, a second fixed pulley, a first operating rope, a second operating rope, a first high-strength cable and a second high-strength cable, wherein the lifting beam has a first end and a second end along the length direction;

[0012] A first lifting mechanism and a second lifting mechanism are spaced apart on the lifting beam. The first lifting mechanism is located near a first end of the lifting beam, and the second lifting mechanism is located near a second end of the lifting beam. The first lifting mechanism includes two first lifting components arranged opposite each other along the width direction of the lifting beam. Each first lifting component includes a first positioning plate, which has a first positioning protrusion and a first overlapping portion. The first positioning protrusion is located above the first overlapping portion. A first fixed pulley is connected to the first positioning protrusion. The first high-strength cable is looped and is used to pass through the first end of the nuclear power low-pressure rotor and to overlap the two first overlapping portions. A first operating rope is wound around the first fixed pulley, and one end of the first operating rope is connected to the first high-strength cable.

[0013] The second hoisting mechanism includes two second hoisting components arranged opposite each other along the width direction of the hoisting beam. Each second hoisting component includes a second positioning plate, the second positioning plate having a second positioning protrusion and a second overlapping portion, the second positioning protrusion being located above the second overlapping portion; the second fixed pulley is connected to the second positioning protrusion; the second high-strength cable is looped, the second high-strength cable is used to pass through the second end of the nuclear power low-pressure rotor, and the second high-strength cable is used to overlap the two second overlapping portions; the second operating rope is wound around the second fixed pulley, and one end of the second operating rope is connected to the second high-strength cable.

[0014] In some embodiments, the first high-strength cable and the second high-strength cable comprise ultra-high molecular weight polyethylene (UHMWPE) cables.

[0015] In some embodiments, the diameter of both the first high-strength cable and the second high-strength cable is 66 mm.

[0016] In some embodiments, the diameter of both the first high-strength cable and the second high-strength cable is 68 mm.

[0017] In some embodiments, a first protective sleeve is provided around the braided portion of the first high-strength cable.

[0018] In some embodiments, the length of the first protective sleeve is 2200mm.

[0019] In some embodiments, a second protective sleeve is provided around the braided portion of the second high-strength cable.

[0020] In some embodiments, the length of the second protective sleeve is 2200mm.

[0021] In some embodiments, the circumference of the first high-strength cable is 15184 mm, 16000 mm, or 16600 mm.

[0022] In some embodiments, the circumference of the second high-strength cable is 15184 mm, 16000 mm, or 16600 mm.

[0023] The implementation of this utility model has the following beneficial effects: By applying this nuclear power low-pressure rotor lifting device, the problem in related technologies that the lower half of the front and rear bearings of the low-pressure rotor must be turned out in order to put in the wire rope for lifting the low-pressure rotor is effectively solved, and the risk of journal scratches is effectively avoided. It also solves the problem of difficulty in removing or suspending the lifting rope when the nuclear power low-pressure rotor is placed on a fixed support, effectively reducing the industrial safety risks of lifting operations. It can shorten the maintenance period by at least three days each time the low-pressure cylinder is opened for maintenance, effectively improving maintenance efficiency. Attached Figure Description

[0024] To more clearly illustrate the technical solution of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of this utility model and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings:

[0025] Figure 1 This is a schematic diagram of the structure of the nuclear power low-pressure rotor lifting device in some embodiments of this utility model;

[0026] Figure 2 This is a partial structural schematic diagram of the nuclear power low-pressure rotor lifting device in some embodiments of this utility model;

[0027] Figure 3 This is a schematic diagram of the first high-strength cable and the second high-strength cable being threaded onto the low-pressure rotor of a nuclear power plant in some embodiments of this utility model;

[0028] Figure 4This is a schematic diagram of the structure of the first high-strength cable in some embodiments of this utility model;

[0029] Figure 5 This is a schematic diagram of the structure of the second high-strength cable in some embodiments of this utility model. Detailed Implementation

[0030] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0031] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0032] In the following description, specific details such as particular system structures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the present invention. However, those skilled in the art will understand that the present invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0033] This utility model discloses a lifting device for low-pressure rotors of nuclear power plants, which is applicable to, but not limited to, the lifting operation of low-pressure rotors of HN1000-6.43 type nuclear power steam turbines.

[0034] See Figure 1 and Figure 2 The nuclear power low-pressure rotor lifting device may include a lifting beam 10, a first fixed pulley 20, a second fixed pulley 30, a first operating rope 40, a second operating rope 50, a first high-strength cable 60, and a second high-strength cable 70. The lifting beam 10 has a first end and a second end along its length.

[0035] The lifting beam 10 is provided with a first lifting mechanism 11 and a second lifting mechanism 12 at intervals. The first lifting mechanism 11 is located near the first end of the lifting beam 10, and the second lifting mechanism 12 is located near the second end of the lifting beam 10. The first lifting mechanism 11 includes two first lifting components 111 arranged opposite to each other along the width direction of the lifting beam 10. Each first lifting component 111 includes a first positioning plate 1111. The first positioning plate 1111 is provided with a first positioning protrusion 1112 and a first overlapping part 1113. The first positioning protrusion 1112 is located above the first overlapping part 1113. A first fixed pulley 20 is connected to the first positioning protrusion 1112. A first high-strength cable 60 is looped and is used to pass through the first end of the nuclear power low-pressure rotor 100 and to overlap the two first overlapping parts 1113. A first operating rope 40 is wound around the first fixed pulley 20, and one end of the first operating rope 40 is connected to the first high-strength cable 60.

[0036] The second hoisting mechanism 12 includes two second hoisting components 121 arranged opposite to each other along the width direction of the hoisting beam 10. Each second hoisting component 121 includes a second positioning plate 1211. The second positioning plate 1211 is provided with a second positioning protrusion 1212 and a second overlapping portion 1213. The second positioning protrusion 1212 is located above the second overlapping portion 1213. The second fixed pulley 30 is connected to the second positioning protrusion 1212. The second high-strength cable 70 is looped and is used to pass through the second end of the nuclear power low-pressure rotor 100 and to overlap the two second overlapping portions 1213. The second operating rope 50 is wound around the second fixed pulley 30, and one end of the second operating rope 50 is connected to the second high-strength cable 70.

[0037] In some embodiments, the lifting beam 10 may be a generally long column structure, and the longitudinal cross-sectional shape of the lifting beam 10 may be I-shaped. The lifting beam 10 can be used to connect to the traveling mechanism or crane of a nuclear power plant.

[0038] In some embodiments, the first positioning protrusion 1112 may be provided with a first hanging hole for the first hook of the first fixed pulley 20 to be hooked. The first overlapping portion 1113 may include a first columnar body and a second columnar body. The first columnar body is connected to the first positioning plate 1111, and the second columnar body is connected to the end of the first columnar body away from the first positioning plate 1111. The longitudinal cross-sectional dimension of the second columnar body is larger than that of the first columnar body, so that when the first high-strength cable 60 is overlapped on the first columnar body, the first high-strength cable 60 will not detach from the first columnar body due to the limiting effect of the second columnar body. Preferably, both the first columnar body and the second columnar body may be cylindrical, and the first columnar body and the second columnar body may be coaxially arranged.

[0039] In some embodiments, the number of the first fixed pulleys 20 can be one or two. When there is one first fixed pulley 20, the first fixed pulley 20 is connected to a first positioning protrusion 1112, for example, the first hook of the first fixed pulley 20 is hooked onto the first hanging hole of the first positioning protrusion 1112. When there are two first fixed pulleys 20, the two second fixed pulleys 30 are respectively connected to the two first positioning protrusions 1112.

[0040] like Figure 2 As shown, the working method of the first fixed pulley 20 and the first operating rope 40 is as follows: when it is necessary to assist in attaching the first high-strength cable 60 to the first overlap 1113, the worker can pull the first operating rope 40 to lift the first high-strength cable 60 upwards, so that the first high-strength cable 60 can be attached to the first overlap 1113; or when it is necessary to assist in detaching the first high-strength cable 60 from the first overlap 1113, the worker can pull the first operating rope 40 to lift the first high-strength cable 60 upwards, so that the first high-strength cable 60 can be detached from the first overlap 1113.

[0041] When there are two first fixed pulleys 20, two workers can operate the first operating rope 40 simultaneously to attach and detach the first high-strength cable 60. Alternatively, when there are two first fixed pulleys 20, one worker can operate the first operating rope 40 sequentially to attach and detach the first high-strength cable 60. Furthermore, during the attachment and detachment of the first high-strength cable 60, one worker can use a long operating rod to make appropriate adjustments to the upper part of the first high-strength cable 60; this is not specifically limited here.

[0042] Similarly, in some embodiments, the second positioning protrusion 1212 may be provided with a second hanging hole for the second hook of the second fixed pulley 30 to be hooked. The second overlapping portion 1213 may include a third column and a fourth column. The third column is connected to the second positioning plate 1211, and the fourth column is connected to the end of the third column away from the second positioning plate 1211. The longitudinal cross-sectional dimension of the fourth column is larger than that of the third column, so that when the second high-strength cable 70 is overlapped on the third column, the second high-strength cable 70 will not detach from the third column due to the limiting effect of the fourth column. Preferably, both the third and fourth columns may be cylindrical, and they may be coaxially arranged.

[0043] In some embodiments, the number of the second fixed pulleys 30 can be one or two. When there is one second fixed pulley 30, the second fixed pulley 30 is connected to a second positioning protrusion 1212, for example, the second hook of the second fixed pulley 30 is hooked onto the second hanging hole of the second positioning protrusion 1212. When there are two second fixed pulleys 30, the two second fixed pulleys 30 are respectively connected to the two second positioning protrusions 1212.

[0044] The working method of the second fixed pulley 30 and the second operating rope 50 is as follows: when it is necessary to assist in attaching the second high-strength cable 70 to the second overlap part 1213, the worker can pull the second operating rope 50 to lift the second high-strength cable 70 upward so that the second high-strength cable 70 can be attached to the second overlap part 1213; or when it is necessary to assist in detaching the second high-strength cable 70 from the second overlap part 1213, the worker can pull the second operating rope 50 to lift the second high-strength cable 70 upward so that the second high-strength cable 70 can be detached from the second overlap part 1213.

[0045] When there are two second fixed pulleys 30, two workers can operate the second operating rope 50 simultaneously to attach and detach the second high-strength cable 70. Alternatively, when there are two second fixed pulleys 30, one worker can operate the second operating rope 50 sequentially to attach (or suspend) and detach the second high-strength cable 70. Furthermore, during the attachment and detachment of the second high-strength cable 70, one worker can use an operating long pole to make appropriate adjustments to the upper part of the second high-strength cable 70; specific limitations are not specified here.

[0046] Preferably, the first operating rope 40 and the second operating rope 50 can be made of polyester fiber rope, or they can be made of ultra-high molecular weight polyethylene rope. The first operating rope 40 and the second operating rope 50 can be selected and set according to actual needs, and no specific limitation is made here.

[0047] Understandably, because the final stage rotor of the nuclear power plant's low-pressure rotor 100 reaches a diameter of 5.7 meters, scaffolding must be erected to remove the lifting ropes when placing the rotor 100 onto the low-pressure rotor support. Lowering it using a lifting beam could easily damage the final stage blades. Therefore, by installing a first fixed pulley 20 and a second fixed pulley 30 on the upper part of the lifting beam 10, along with a first operating rope 40 and a second operating rope 50, the first high-strength cable 60 and the second high-strength cable 70 can be quickly removed and suspended, effectively improving operational efficiency and preventing damage to the blades of the nuclear power plant's low-pressure rotor 100.

[0048] In some embodiments, the first high-strength cable 60 and the second high-strength cable 70 comprise ultra-high molecular weight polyethylene (UHMWPE) cables, for example, the first high-strength cable 60 and the second high-strength cable 70 may be eight-strand UHMWPE cables or twelve-strand UHMWPE cables.

[0049] Ultra-high molecular weight polyethylene (UHMWPE) cables are stronger than steel wire ropes of the same diameter. Compared with steel wire ropes of the same length and diameter, UHMWPE cables weigh only 15% of steel wire ropes, effectively reducing the workload of crane operators.

[0050] In addition, ultra-high molecular weight polyethylene (UHMWPE) cables have excellent bending and fatigue resistance. The first high-strength cable 60 and the second high-strength cable 70 can be stored in a tool shed in a well-ventilated environment away from direct sunlight, making storage and maintenance relatively convenient.

[0051] In some embodiments, the diameters of both the first high-strength cable 60 and the second high-strength cable 70 are 66 mm. In other embodiments, the diameters of both the first high-strength cable 60 and the second high-strength cable 70 are 67 mm. In still other embodiments, the diameters of both the first high-strength cable 60 and the second high-strength cable 70 are 68 mm. In this embodiment, the diameters of the first high-strength cable 60 and the second high-strength cable 70 are preferably 66 mm.

[0052] Because the first high-strength cable 60 and the second high-strength cable 70 are made of ultra-high molecular weight polyethylene, their flexibility is stronger than that of steel wire rope, allowing them to exceed the 75mm gap between the bearing housing and the low-pressure rotor 100 of the nuclear power plant (e.g., Figure 3 As shown in the figure, this effectively avoids the problem of having to flip the tiles when lifting the low-pressure rotor of the nuclear power plant 100, and greatly reduces the workload on site.

[0053] In addition, since the first high-strength cable 60 and the second high-strength cable 70 are made of ultra-high molecular weight polyethylene, they do not damage the journal of the nuclear power low-pressure rotor 100 during the lifting process, and there is no need to pad with a 6mm thick copper plate afterward, which reduces the workload of maintenance personnel.

[0054] like Figure 4 As shown, in some embodiments, a first protective sleeve 62 is provided around the braided portion 61 of the first high-strength cable 60. Since the two ends of the cable in the length direction need to be braided together to form a loop structure, a braided portion is formed. The first protective sleeve 62 can protect the braided portion 61 of the first high-strength cable 60 from wear. The first protective sleeve 62 can slide on the first high-strength cable 60 to facilitate position adjustment. Alternatively, the first protective sleeve 62 can also be sewn onto the outer periphery of the braided portion 61 of the first high-strength cable 60.

[0055] Furthermore, the first protective sleeve 62 may be a polyester fiber sleeve. Since the length of the braided portion 61 of the first high-strength cable 60 is approximately 2000mm to 2200mm, the length of the first protective sleeve 62 may be 2200mm.

[0056] Similarly, such as Figure 5 As shown, in some embodiments, a second protective sleeve 72 is provided around the braided portion 71 of the second high-strength cable 70. Since the two ends of the cable in the length direction need to be braided together to form a loop structure, a braided portion is formed. The second protective sleeve 72 can protect the braided portion 71 of the second high-strength cable 70 from wear. The second protective sleeve 72 can slide on the second high-strength cable 70 to facilitate position adjustment. Alternatively, the second protective sleeve 72 can also be sewn onto the outer periphery of the braided portion 71 of the second high-strength cable 70.

[0057] Furthermore, the second protective sleeve 72 can be a polyester fiber sleeve. Since the length of the braided portion 71 of the second high-strength cable 70 is approximately 2000mm to 2200mm, the length of the second protective sleeve 72 can be 2200mm.

[0058] In some embodiments, the circumference of the first high-strength cable 60 is 15184 mm, 16000 mm, or 16600 mm.

[0059] In some embodiments, the circumference of the second high-strength cable 70 is 15184 mm, 16000 mm, or 16600 mm.

[0060] The application of this nuclear power low-pressure rotor lifting device effectively solves the problem in related technologies that the lower half of the front and rear bearings of the low-pressure rotor must be flipped out before the steel wire rope for lifting the low-pressure rotor can be inserted. It also effectively avoids the risk of journal scratches and solves the problem of difficulty in removing or suspending the lifting rope when the nuclear power low-pressure rotor 100 is placed on a fixed support. It effectively reduces the industrial safety risks of lifting operations and can shorten the maintenance period of the nuclear power low-pressure rotor 100 by at least three days during each low-pressure cylinder opening and maintenance operation, thus effectively improving maintenance efficiency.

[0061] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A lifting device for a low-pressure rotor in a nuclear power plant, characterized in that, It includes a lifting beam, a first fixed pulley, a second fixed pulley, a first operating rope, a second operating rope, a first high-strength cable, and a second high-strength cable, wherein the lifting beam has a first end and a second end along its length. A first lifting mechanism and a second lifting mechanism are spaced apart on the lifting beam. The first lifting mechanism is located near a first end of the lifting beam, and the second lifting mechanism is located near a second end of the lifting beam. The first lifting mechanism includes two first lifting components arranged opposite each other along the width direction of the lifting beam. Each first lifting component includes a first positioning plate, which has a first positioning protrusion and a first overlapping portion. The first positioning protrusion is located above the first overlapping portion. A first fixed pulley is connected to the first positioning protrusion. The first high-strength cable is looped and is used to pass through the first end of the nuclear power low-pressure rotor and to overlap the two first overlapping portions. A first operating rope is wound around the first fixed pulley, and one end of the first operating rope is connected to the first high-strength cable. The second hoisting mechanism includes two second hoisting components arranged opposite each other along the width direction of the hoisting beam. Each second hoisting component includes a second positioning plate, the second positioning plate having a second positioning protrusion and a second overlapping portion, the second positioning protrusion being located above the second overlapping portion; the second fixed pulley is connected to the second positioning protrusion; the second high-strength cable is looped, the second high-strength cable is used to pass through the second end of the nuclear power low-pressure rotor, and the second high-strength cable is used to overlap the two second overlapping portions; the second operating rope is wound around the second fixed pulley, and one end of the second operating rope is connected to the second high-strength cable.

2. The nuclear power plant low-pressure rotor lifting device according to claim 1, characterized in that, The first high-strength cable and the second high-strength cable both comprise ultra-high molecular weight polyethylene cables.

3. The nuclear power plant low-pressure rotor lifting device according to claim 1, characterized in that, The diameter of both the first high-strength cable and the second high-strength cable is 66mm.

4. The nuclear power plant low-pressure rotor lifting device according to claim 1, characterized in that, The diameter of both the first high-strength cable and the second high-strength cable is 68mm.

5. The nuclear power plant low-pressure rotor lifting device according to claim 1, characterized in that, The first high-strength cable has a first protective sleeve around its braided section.

6. The nuclear power plant low-pressure rotor lifting device according to claim 5, characterized in that, The length of the first protective sleeve is 2200mm.

7. The nuclear power plant low-pressure rotor lifting device according to claim 1, characterized in that, The second high-strength cable has a second protective sleeve around its braided section.

8. The nuclear power plant low-pressure rotor lifting device according to claim 7, characterized in that, The second protective sleeve is 2200mm long.

9. The nuclear power plant low-pressure rotor lifting device according to claim 1, characterized in that, The circumference of the first high-strength cable is 15184mm, 16000mm or 16600mm.

10. The nuclear power plant low-pressure rotor lifting device according to claim 1, characterized in that, The second high-strength cable has a circumference of 15184mm, 16000mm or 16600mm.

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