Hoisting device for gigawatt-level low-pressure inner cylinder large-scale component

Abstract

The utility model belongs to the technical field of hoisting of large components, and particularly relates to a hoisting device for large components of a gigawatt-level low-pressure inner cylinder. The diameter of the main shaft is matched with the drainage hole of the semi-ring forge piece, and the main shaft is used for penetrating through the drainage hole; a blocking piece is arranged at one end of the main shaft and used for limiting axial displacement of the semi-ring forge piece, the other end of the main shaft is sequentially sleeved with a spring gasket and a nut, the spring gasket is pressed and deformed by screwing the nut, and the semi-ring forge piece is clamped between the blocking piece and the spring gasket. The universal lifting ring with a bearing is connected with the main shaft through a steel wire rope, two lifting devices are configured during vertical lifting, and three lifting devices are configured during horizontal lifting. According to the method, welding of temporary lifting lugs is avoided, damage of a traditional process to component structures is avoided, lifting stability and operation convenience are improved, safety and reliability in the lifting process are guaranteed, production cost is saved, and construction efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of hoisting large components, and particularly relates to a hoisting device for a large component of a gigawatt low-pressure inner cylinder. BACKGROUND

[0002] The gigawatt low-pressure inner cylinder is a key component in nuclear power or large power generation equipment, and has great manufacturing process difficulty, long cycle, and high precision requirement. In the field of nuclear power, such as the Sanmen nuclear power project, the low-pressure inner cylinder is a key equipment of the conventional island steam turbine, and one set of low-pressure inner cylinder is divided into an upper module and a lower module. The upper module is about 90 tons, and the lower module is about 100 tons. These low-pressure inner cylinders need to go through a large number of processes such as assembly and welding, alloy surfacing, non-destructive testing, machining, assembly, and flow gap measurement in the manufacturing process to ensure the quality and precision.

[0003] The existing technology of hoisting the large component of the gigawatt low-pressure inner cylinder, the large semi-ring forging of the gigawatt low-pressure inner cylinder, has a single piece weight of about 15 tons. Since no special lifting lug is designed, a temporary lifting lug needs to be welded for hoisting during construction, and the part surface needs to be cut and polished after use to restore the part surface, resulting in high labor, material and time cost. The traditional method not only has low efficiency, but also has safety hazards caused by unstable welding quality, and repeated welding and cutting may cause damage to the structure of the forging. Therefore, a special hoisting device that does not damage the structure of the part, can be reused and is safe and efficient is urgently needed. SUMMARY

[0004] In order to solve the problems of the prior art that the gigawatt low-pressure inner cylinder large component hoisting needs to weld a temporary lifting lug, damages the structure of the part, is unstable, is complex to operate, is not safe and reliable in the hoisting process, and causes high production cost and low construction efficiency, a gigawatt low-pressure inner cylinder large component hoisting device is provided, which comprises: a main shaft, the diameter of which is adapted to the drain hole of the semi-ring forging and is used to penetrate the drain hole; a baffle is sleeved on the main shaft to limit the axial displacement of the semi-ring forging; a spring washer and a nut are sequentially sleeved on one end of the main shaft, and the spring washer is deformed under pressure by tightening the nut to clamp the semi-ring forging between the baffle and the spring washer; a universal lifting ring is arranged at the other end of the main shaft, a bearing is arranged on the universal lifting ring, and the main shaft is connected with the universal lifting ring through the bearing; a steel wire rope passes through the universal lifting ring and is used for hoisting and overturning the semi-ring forging; two hoisting devices are configured for vertical hoisting, and three hoisting devices are configured for horizontal hoisting.

[0005] According to the gigawatt low-pressure inner cylinder large component hoisting device described above, the material of the main shaft is high-strength alloy steel, and the tensile strength is greater than or equal to 800 MPa.

[0006] According to the gigawatt low-pressure inner cylinder large component hoisting device described above, the baffle is a circular or polygonal structure, and the diameter is greater than 1.5 times the diameter of the drain hole.

[0007] According to the above-mentioned megawatt-level low-pressure inner cylinder large component hoisting device, the elastic modulus of the spring washer is 200-250 GPa, and the thickness is 5-8 mm.

[0008] According to the above-mentioned megawatt-level low-pressure inner cylinder large component hoisting device, the screw cap is a locking screw cap, and the thread specification is M30-M50.

[0009] According to the above-mentioned megawatt-level low-pressure inner cylinder large component hoisting device, the bearing of the universal lifting ring is a self-lubricating ball bearing, allowing 360° rotation.

[0010] According to the above-mentioned megawatt-level low-pressure inner cylinder large component hoisting device, the breaking strength of the steel wire rope is more than 5 times the weight of the half-ring forge piece.

[0011] According to the above-mentioned megawatt-level low-pressure inner cylinder large component hoisting device, the safety factor of the hoisting device is ≥3.5.

[0012] According to the above-mentioned megawatt-level low-pressure inner cylinder large component hoisting device, the main shaft is connected with the universal lifting ring through a shackle.

[0013] According to the above-mentioned megawatt-level low-pressure inner cylinder large component hoisting device, the hoisting device can be reused, and the surface of the half-ring forge piece is not damaged after disassembly.

[0014] The beneficial effects of the present application are as follows:

[0015] 1. The present application uses the hydrophobic hole of the half-ring forge piece as a fixing point, adopts a mechanical clamping method of main shaft, baffle, spring washer and screw cap, avoids welding temporary lifting lugs, and solves the problem of damage to the structure of the component in the traditional process.

[0016] 2. The bearing-equipped universal lifting ring design allows flexible adjustment at multiple angles during hoisting, and significantly improves hoisting stability and operation convenience in combination with steel wire rope connection.

[0017] 3. According to the hoisting direction: vertical or horizontal, the number of devices is dynamically adjusted: 2 vertical and 3 horizontal, and through material selection, such as high-strength main shaft, locking screw cap, and safety factor calculation, the safety and reliability of the hoisting process are ensured.

[0018] 4. The present application completely eliminates additional processes such as welding and cutting, saves production cost and improves construction efficiency, and has significant industrial application value. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The figure is a structural schematic diagram of the megawatt-level low-pressure inner cylinder large component hoisting device of the present application.

[0020] Figure 2 Figure is the schematic diagram of the use of the megawatt low-pressure inner cylinder large component hoisting device.

[0021] In the figure: 1-universal lifting ring, 2-bearing, 3-flap, 4-main shaft, 5-spring washer, 6-nut, 7-semi-ring forge piece, 8-megawatt low-pressure inner cylinder large component hoisting device, 9-drainage hole. DETAILED DESCRIPTION

[0022] Preferred embodiment

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0024] As shown in Figure 1 , Figure 2 : in this embodiment, the megawatt low-pressure inner cylinder large component hoisting device comprises: a main shaft 4, the diameter of which is adapted to the drainage hole 9 of the semi-ring forge piece 7 for penetrating through the drainage hole 9; a flap 3 is sleeved on the main shaft 4 for limiting the axial displacement of the semi-ring forge piece 7, a spring washer 5 and a nut 6 are sequentially sleeved on one end of the main shaft 4, the spring washer 5 is deformed under pressure by tightening the nut 6 to clamp the semi-ring forge piece 7 between the flap 3 and the spring washer 5; a universal lifting ring 1 is arranged at the other end of the main shaft 4, a bearing 2 is arranged on the universal lifting ring 1, and the main shaft 4 is connected with the universal lifting ring 1 through the bearing 2; a steel wire rope penetrates through the universal lifting ring 1 for hoisting and overturning the semi-ring forge piece 7; two hoisting devices are configured for vertical hoisting, and three hoisting devices are configured for horizontal hoisting.

[0025] The material of the main shaft 4 is high-strength alloy steel with a tensile strength ≥800MPa. The flap 3 is circular or polygonal in structure with a diameter greater than 1.5 times the diameter of the drainage hole 9. The spring washer 5 has an elastic modulus of 200-250GPa and a thickness of 5-8mm. The nut 6 is a lock nut with a thread size of M30-M50.

[0026] The bearing 2 of the universal lifting ring 1 is a self-lubricating ball bearing allowing 360° rotation. The breaking strength of the steel wire rope is more than 5 times the weight of the semi-ring forge piece 7. The safety factor of the hoisting device is ≥3.5. The main shaft 4 and the universal lifting ring 1 are connected through a shackle. The hoisting device can be reused without damaging the surface of the semi-ring forge piece 7 after disassembly.

[0027] Composition and assembly of the hoisting device:

[0028] Main shaft 4 selection: according to the hole diameter of the half-ring forging drain hole 9, the hole diameter of the drain hole 9 in this embodiment is Φ80mm, a high-strength alloy steel main shaft with a diameter of Φ78mm is selected, and the surface is galvanized for corrosion protection.

[0029] Baffle 3 installation: a circular baffle with a diameter of 120mm is welded to one end of the main shaft 4 to ensure that it is perpendicular to the main shaft 3.

[0030] Spring washer 5 and nut 6 configuration: a spring steel washer with a thickness of 6mm and an M42 lock nut are sequentially sleeved, and are tightened to a preset torque value of 500N·m by a torque wrench, so that the spring washer is elastically deformed to form a stable clamping force.

[0031] Universal lifting ring 1 connection: the universal lifting ring 1 with self-lubricating bearings is connected to the end of the main shaft 1 through a shackle, and a steel wire rope with a breaking strength of ≥75 tons is selected to adapt to 15 tons of forgings.

[0032] Hoisting operation steps:

[0033] 1. Vertical hoisting:

[0034] Two hoisting devices are symmetrically installed on the drain holes 9 of the half-ring forgings;

[0035] The steel wire rope is hooked by the crane, slowly lifted and balanced to ensure that the forging is vertically lifted.

[0036] 2. Horizontal hoisting:

[0037] Three hoisting devices are installed in a triangular distribution on the drain holes 9 of the forgings;

[0038] Adjust the length of the steel wire rope to make the stress uniform, and start the crane to move the forging smoothly.

[0039] Safety verification

[0040] Adjust the safety factor of the hoisting device through redundant design calculation: the tensile strength of the main shaft is 800MPa, and the ratio of the maximum working stress of 230MPa is 3.48, which meets the requirement of ≥3.5.

[0041] Load test: 1.25 times the rated load: 18.75 tons, static load for 10 minutes, check that there is no deformation and looseness of each part.

[0042] The low-pressure inner cylinder half-ring forging of this embodiment weighs 15 tons, and the drain hole is Φ80mm, which is hoisted by using this device:

[0043] Vertical hoisting takes 20 minutes, which is 3 hours shorter than the traditional welding method; the surface of the forging is not damaged after disassembly, and there is no need for repair; the single hoisting cost is reduced by 60%.

[0044] The device can be popularized to the field of large forging manufacturing of nuclear power, thermal power and the like, and is especially suitable for hoisting and transporting heavy components without special lug structure, and has the comprehensive advantages of high efficiency, safety and economy.

[0045] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can make equivalent replacements or changes to the technical scheme and the inventive concept of the present application within the disclosed technical scope, which should be covered within the protection scope of the present application.

Claims

1. A hoisting device for large components of a gigawatt low-pressure inner cylinder, characterized in that, The utility model relates to a half ring forging lifting device, including: The main shaft (4) is suitable for the hydrophobic hole (9) of half ring forging (7) in diameter for penetrating the hydrophobic hole (9), the baffle (3) is set on the main shaft (4) for limiting the axial displacement of half ring forging (7), the spring washer (5) and the nut (6) are set on the one end of main shaft (4) in proper order, the spring washer (5) is compressed and deformed by screwing the nut (6), and half ring forging (7) is clamped between the baffle (3) and the spring washer (5), the other end of main shaft (4) is provided with universal lifting ring (1), bearing (2) is provided on universal lifting ring (1), and main shaft (4) is connected with universal lifting ring (1) through bearing (2), and steel wire rope passes through universal lifting ring (1) and is used for hoisting and overturning half ring forging (7), and when hoisting vertically, 2 hoisting devices are configured, and when hoisting horizontally, 3 hoisting devices are configured.

2. The 1000 MW class low-pressure inner casing large component lifting device according to claim 1, wherein The main shaft (4) is made of high-strength alloy steel with a tensile strength of greater than or equal to 800 MPa.

3. The 1000 MW class low-pressure inner casing large component lifting device according to claim 2, wherein The baffle (3) is circular or polygonal in structure and has a diameter of 1.5 times the diameter of the hydrophobic hole (9).

4. The 1000 MW class low-pressure inner casing large component lifting device according to claim 3, characterized by The spring washer (5) has an elastic modulus of 200-250 GPa and a thickness of 5-8 mm.

5. The 1000 MW class low-pressure inner casing large component lifting device according to claim 4, characterized by The nut (6) is a locking nut with a thread size of M30-M50.

6. The 1000 MW class low pressure inner casing large component lifting device according to claim 5, wherein The bearing (2) of the universal lifting ring (1) is a self-lubricating ball bearing that allows 360° rotation.

7. The 1000 MW class low pressure inner casing large component lifting device according to claim 6, wherein The breaking strength of the steel wire rope is more than 5 times the weight of the half ring forging (7).

8. The 1000 MW class low pressure inner casing large component lifting device according to claim 7, wherein The safety factor of the hoisting device is greater than or equal to 3.

5.

9. The 1000 MW class low pressure inner casing large component lifting device according to claim 1 or 8, characterized by The main shaft (4) is connected to the universal lifting ring (1) through a shackle.

10. The 1000 MW class low pressure inner casing large component lifting device according to claim 9, wherein The hoisting device can be reused without damaging the surface of the half ring forging (7) after disassembly.

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