A stator core segment lifting device and its use method

Abstract

The present invention discloses a stator core segment lifting device and a method for using the same, which relates to the technical field of steam turbine generators and includes a lifting plate and a plurality of lifting mechanisms. The lifting mechanisms include guide rails, lifting hooks, and linear actuators. The guide rails are radially arranged along the lifting plate. The lifting hooks are slidably connected to the guide rails via sliders. The lifting hooks include outer lifting hooks and inner lifting hooks. The linear actuators are arranged between the outer lifting hooks and the inner lifting hooks and act on the outer lifting hooks and the inner lifting hooks. The outer lifting hooks are close to the outer ring of the lifting plate, and the inner lifting hooks are close to the inner ring of the lifting plate. A plurality of the lifting mechanisms are circumferentially spaced apart on the bottom surface of the lifting plate. The stator core segment lifting device provided by the present invention and a method for using the same have the advantages of short clamping time and convenient clamping process. The stator core segment lifting device and a method for using the same have the advantages of short clamping time and convenient clamping process. The stator core segment lifting device provided by the present invention has a top support leg with adjustable height to accommodate cores of different heights.

Description

Technical Field

[0001] The present invention relates to the technical field of steam turbine generators, and in particular to a stator core segment lifting device and a use method thereof. Background Art

[0002] The segmented, stacked assembly of a steam turbine generator's stator core improves stator core assembly efficiency, thereby shortening the turbine generator's manufacturing cycle. This process allows for simultaneous stator core assembly at multiple stations, with multiple segments then assembled together to complete the stator core assembly. Lifting of the segmented, stacked core requires minimal deformation during the lifting process, and the lifting tooling must be quickly assembled and disassembled to ensure high-quality stator core assembly.

[0003] Lifting the stator core segments is a critical process for ensuring stator core assembly efficiency and quality. Currently, this process typically utilizes through-hole screws in the core segments, as demonstrated in the patent titled "A Core Segment Lifting Structure," patent number CN103552910B. This invention utilizes through-hole screws in the stator core segments, resulting in rapid installation of the lifting tool and high lifting efficiency. However, this method is not suitable for machines with segments that lack through-hole screws. Summary of the Invention

[0004] The purpose of the present invention is: to address the above-mentioned problems, the present invention provides a stator core segment lifting device and a method of using the same, which drives the inner lifting hook and the outer lifting hook to cooperate with the inner and outer circles of the iron core for lifting through a linear actuator, has the advantages of short clamping time and convenient clamping process; is provided with a top support leg with adjustable height to adapt to iron cores of different heights, and has broad application prospects.

[0005] The technical solution adopted in the present invention is as follows:

[0006] A stator core segment lifting device includes a lifting plate and several lifting mechanisms, the lifting mechanisms include guide rails, lifting hooks and linear actuators, the guide rails are arranged radially along the lifting plate, the lifting hooks are slidably connected to the guide rails through sliders, the lifting hooks include outer lifting hooks and inner lifting hooks, the linear actuators are arranged between the outer lifting hooks and the inner lifting hooks, and act on the outer lifting hooks and the inner lifting hooks, the outer lifting hooks are close to the outer ring of the lifting plate, and the inner lifting hooks are close to the inner ring of the lifting plate, and multiple lifting mechanisms are arranged on the bottom surface of the lifting plate at intervals along the circumferential direction.

[0007] Furthermore, the number of the lifting mechanisms is in a multiple relationship with the number of the core punching sheets, and a groove portion is formed between two adjacent core punching sheets. The groove portion includes an outer groove matching the outer ring of the core and an inner groove matching the inner ring of the core. The outer lifting hook can match the outer groove, and the inner lifting hook can match the inner groove. More than two lifting mechanisms can cooperate with each other to limit the core.

[0008] Furthermore, a limiting protrusion that can match the gap on the bottom surface of the iron core extends horizontally from the bottom end of the lifting hook, and the limiting protrusions of the inner lifting hook and the outer lifting hook are arranged facing each other.

[0009] Due to the adoption of the above technical solution, the bottom layer of the iron core is provided with ventilation channel steel, and the limiting protrusion can be inserted into the gap formed by the ventilation channel steel. The limiting protrusion can limit the iron core in the vertical direction; the inner lifting hook and the outer lifting hook cooperate with each other to limit the iron core in the radial direction.

[0010] Furthermore, it also includes a guide rod, and the lifting plate is provided with a guide hole matching the guide rod. The guide rod passes through the guide hole and is movably connected to the lifting plate. The length of the guide rod is greater than the length of the lifting hook.

[0011] Due to the adoption of the above technical solution, the guide rod can enter the groove part before the lifting hook, thereby playing a guiding role. The number of guide rods is generally set to three, and they are evenly distributed on the inner circle of the lifting plate. If the guide rods can smoothly enter the groove part, the lifting hook will be aligned with the corresponding groove part.

[0012] Furthermore, a limiting portion is provided at one end of the guide rod, and the limiting portion can be limited to the guide hole. The other end of the guide rod passes through and extends out of the guide hole, and the guide rod can move along its axial direction under the limitation of the guide hole.

[0013] Due to the adoption of the above technical solution, since the guide rod is not fixed to the lifting plate, if the guide rod is blocked in the process of entering the groove, the guide rod can move along its axial direction, effectively avoiding scratching the iron core.

[0014] Furthermore, it also includes side legs, which are arranged below the lifting plate, and the length of the side legs is greater than the length of the lifting hook.

[0015] Due to the adoption of the above technical solution, the length of the side legs is slightly longer than the lifting hook. During the process of lifting the stator, the side legs contact the plane on which the iron core is placed, so that there is a gap between the lifting hook and the plane on which the iron core is placed, which facilitates the adjustment of the lifting hook; the side legs serve as support when the stator core segment lifting device is not in use.

[0016] Furthermore, it also includes a top support leg, on which a length adjustment device is provided. The top support leg can be against the top surface of the iron core when the lifting mechanism is assembled with the iron core.

[0017] Due to the adoption of the above technical solution, when the iron core is too high to be moved away at one time, the relative height of the lifting hook and the iron core can be changed by adjusting the top support legs, so that the gap height between the limiting protrusion and the bottom surface of the target layer iron core remains level.

[0018] Correspondingly, the present invention also discloses a method for using a stator core segment lifting device, comprising the following steps:

[0019] Positioning steps: Adjust the position of the lifting plate so that it is directly above the iron core, control the lifting plate to fall, and adjust the lifting plate so that the guide rod enters the groove of the iron core. Adjust the height of the lifting plate so that the bottom end of the lifting hook matches the bottom surface of the target layer iron core;

[0020] Clamping steps: Start the linear actuator, the outer lifting hook and the inner lifting hook move toward each other, the outer lifting hook enters the outer groove, and the inner lifting hook enters the inner groove, and the outer lifting hook and the inner lifting hook cooperate with each other to restrict the iron core to the lifting mechanism;

[0021] Lifting steps: Control the lifting plate to rise and complete the lifting of the iron core.

[0022] Furthermore, in the positioning step, if the height of the iron core is less than or equal to the height of the lifting hook, when adjusting the position of the lifting plate, the side legs are placed against the platform on which the iron core is placed; if the height of the iron core is greater than the height of the lifting hook, when adjusting the position of the lifting plate, the top legs are placed against the top surface of the iron core, and the height of the top legs is adjusted until the bottom end of the lifting hook matches the bottom surface of the target layer iron core.

[0023] Furthermore, the bottom end of the lifting hook extends horizontally with a limiting protrusion that can match the gap on the bottom surface of the iron core, and the limiting protrusions of the inner lifting hook and the outer lifting hook are arranged facing each other; in the clamping step, the limiting protrusion is inserted into the gap on the bottom surface of the target layer iron core under the drive of the linear actuator.

[0024] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0025] 1. The present invention can drive the inner lifting hook and the outer lifting hook to cooperate with the inner and outer circles of the iron core for lifting through the linear actuator, and the clamping process is efficient and convenient.

[0026] 2. The present invention is provided with a guide rod to assist the lifting mechanism in aligning with the iron core.

[0027] 3. The side legs of the present invention can play a positioning role when lifting work is carried out, and can play a supporting role when no lifting work is carried out.

[0028] 4. The length of the top legs of the present invention is adjustable to accommodate iron cores of different heights. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is an assembly drawing of the stator core segment lifting device of the present invention;

[0030] Figure 2 It is a schematic diagram of the internal structure of the stator core segment lifting device of the present invention;

[0031] Figure 3 It is a structural schematic diagram of the stator core segment lifting device and the core assembly of the present invention;

[0032] Figure 4 It is a partial cross-sectional view of the assembly of the stator core segment lifting device and the core of the present invention;

[0033] Figure 5 It is a structural schematic diagram of the lifting mechanism of the present invention.

[0034] Markings in the figure: 1-lifting plate, 2-lifting element, 3-guide rail, 4-lifting hook, 401-external lifting hook, 402-inner lifting hook, 5-linear actuator, 6-guide rod, 7-long support leg, 8-side support leg, 9-iron core. DETAILED DESCRIPTION

[0035] The present invention will be described in detail below with reference to the accompanying drawings.

[0036] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0037] Example 1

[0038] A stator core segment lifting device, such as Figure 1-5 As shown, it includes a lifting plate 1 and several lifting mechanisms, the lifting mechanism includes a guide rail 3, a lifting hook 4 and a linear actuator 5, the guide rail 3 is arranged radially along the lifting plate 1, the lifting hook 4 is slidably connected to the guide rail 3 through a slider, the lifting hook 4 includes an outer lifting hook 401 and an inner lifting hook 402, the linear actuator 5 is arranged between the outer lifting hook 401 and the inner lifting hook 402, and acts on the outer lifting hook 401 and the inner lifting hook 402, the outer lifting hook 401 is close to the outer ring of the lifting plate 1, and the inner lifting hook 402 is close to the inner ring of the lifting plate 1, and multiple lifting mechanisms are arranged on the bottom surface of the lifting plate 1 at intervals along the circumferential direction.

[0039] The number of the lifting mechanisms is in a multiple relationship with the number of the core punching sheets. A groove portion is formed between two adjacent core punching sheets. The groove portion includes an outer groove that matches the outer ring of the core 9 and an inner groove that matches the inner ring of the core 9. The outer lifting hook 401 can match the outer groove, and the inner lifting hook 402 can match the inner groove. More than two lifting mechanisms can cooperate with each other to limit the core 9.

[0040] The bottom end of the lifting hook 4 extends horizontally with a stopper protrusion that fits within the gap on the bottom surface of the iron core 9. The lifting hook 4 and the stopper protrusion cooperate to form an L-shaped structure, with the stopper protrusions of the inner lifting hook 402 and the outer lifting hook 401 facing each other. Specifically, the bottom layer of the iron core 9 is provided with ventilation channels, and the stopper protrusion can be inserted into the gap formed by the ventilation channels, thereby restraining the iron core 9 in the vertical direction. The inner lifting hook 402 and the outer lifting hook 401 cooperate with each other to restrain the iron core 9 in the radial direction.

[0041] The lifting plate 1 further includes a guide rod 6. A guide hole matching the guide rod 6 is provided on the lifting plate 1. The guide rod 6 passes through the guide hole and is movably connected to the lifting plate 1. The length of the guide rod 6 is greater than the length of the lifting hook 4. Specifically, the guide rod 6 can enter the groove portion before the lifting hook 4, thereby playing a guiding role. In this embodiment, there are three guide rods 6, which are evenly distributed on the inner circle of the lifting plate 1. If all the guide rods 6 can smoothly enter the groove portion, the lifting hook 4 will be aligned with the corresponding groove portion.

[0042] One end of the guide rod 6 is provided with a stopper that can be constrained at the guide hole. The other end of the guide rod 6 extends through and out of the guide hole, allowing the guide rod 6 to move along its axis within the limit of the guide hole. Specifically, since the guide rod 6 is not fixed to the lifting plate 1, if the guide rod 6 is blocked during entry into the groove, the guide rod 6 can move along its axis, effectively avoiding scratching the iron core 9.

[0043] The stator also includes side legs 8, which are located below the lifting plate 1 and are longer than the lifting hook 4. Specifically, the side legs 8 are slightly longer than the lifting hook 4. During stator lifting, the side legs 8 contact the plane on which the core 9 is placed, creating a gap between the lifting hook 4 and the plane on which the core 9 is placed, facilitating adjustment of the lifting hook 4. The side legs 8 serve as support when the stator core segment lifting device is not in use.

[0044] It also includes a top leg 7, which is provided with a length adjustment device. When the lifting mechanism is assembled with the core 9, the top leg 7 can be placed against the top surface of the core 9. Specifically, when the core 9 is too high to be moved all at once, the top leg 7 can be adjusted to change the relative height between the lifting hook 4 and the core 9 so that the gap between the limiting protrusion and the bottom surface of the core 9 in the target layer remains level.

[0045] The top surface of the lifting plate 1 is provided with a plurality of lifting elements 2, and slings can be assembled on the lifting elements 2. The position of the lifting plate 1 is controlled by pulling the slings.

[0046] Example 2

[0047] A method for using a stator core segment lifting device, such as Figure 1-5 As shown, the process includes the following steps: a positioning step: adjusting the position of the lifting plate 1 so that the lifting plate 1 is located directly above the iron core 9, controlling the lifting plate 1 to fall, and adjusting the lifting plate 1 so that the guide rod 6 enters the groove of the iron core 9, and adjusting the height of the lifting plate 1 so that the bottom end of the lifting hook 4 matches the bottom surface of the target layer iron core 9;

[0048] Clamping step: start the linear actuator 5, the outer lifting hook 401 and the inner lifting hook 402 move toward each other, the outer lifting hook 401 enters the outer groove, and the inner lifting hook 402 enters the inner groove, and the outer lifting hook 401 and the inner lifting hook 402 cooperate with each other to restrict the iron core 9 to the lifting mechanism;

[0049] Lifting steps: control the lifting plate 1 to rise and complete the lifting of the iron core 9.

[0050] In the positioning step, if the height of the iron core 9 is less than or equal to the height of the lifting hook 4, when adjusting the position of the lifting plate 1, the side support legs 8 are placed against the platform on which the iron core 9 is placed; if the height of the iron core 9 is greater than the height of the lifting hook 4, when adjusting the position of the lifting plate 1, the top support legs 7 are placed against the top surface of the iron core 9, and the height of the top support legs 7 is adjusted until the bottom end of the lifting hook 4 matches the bottom surface of the target layer iron core 9.

[0051] The bottom end of the lifting hook 4 extends horizontally to have a limiting protrusion that can match the gap on the bottom surface of the iron core 9, and the limiting protrusions of the inner lifting hook 402 and the outer lifting hook 401 are arranged facing each other; in the clamping step, the limiting protrusion is inserted into the gap on the bottom surface of the target layer iron core 9 under the drive of the linear actuator 5.

[0052] The linear actuator 5 may also be activated to cause the outer lifting hook 401 and the inner lifting hook 402 to move in opposite directions, thereby releasing the restriction on the iron core.

[0053] Preferably, the linear actuator 5 may be a pneumatic cylinder or a hydraulic cylinder.

[0054] The principles and implementation methods of the present invention are described herein using specific embodiments. The description of the above embodiments is intended only to facilitate understanding of the method and core concept of the present invention. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0055] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0056] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

Claims

1. A stator core segment lifting device, comprising a lifting plate and a plurality of lifting mechanisms, characterized in that: The lifting mechanism includes a guide rail, a lifting hook and a linear actuator, the guide rail is arranged radially along the lifting plate, the lifting hook is slidably connected to the guide rail through a slider, the lifting hook includes an outer lifting hook and an inner lifting hook, the linear actuator is arranged between the outer lifting hook and the inner lifting hook, and acts on the outer lifting hook and the inner lifting hook, the outer lifting hook is close to the outer ring of the lifting plate, and the inner lifting hook is close to the inner ring of the lifting plate, and multiple lifting mechanisms are arranged on the bottom surface of the lifting plate at intervals along the circumferential direction; the number of the lifting mechanisms is in a multiple relationship with the number of iron core punchings, and a groove portion is formed between two adjacent iron core punchings, and the groove portion includes an outer groove matching the outer ring of the iron core, and an inner groove matching the inner ring of the iron core. The outer lifting hook can match the outer groove, the inner lifting hook can match the inner groove, and more than two lifting mechanisms can cooperate with each other to limit the iron core; the bottom end of the lifting hook extends horizontally to have a limiting protrusion that can match the gap in the bottom surface of the iron core, and the limiting protrusions of the inner lifting hook and the outer lifting hook are arranged facing each other; the lifting plate is provided with a guide hole that matches the guide rod, and the guide rod is movably connected to the lifting plate through the guide hole, and the length of the guide rod is greater than the length of the lifting hook; one end of the guide rod is provided with a limiting part, and the limiting part can be limited to the guide hole, and the other end of the guide rod passes through and extends out of the guide hole, and the guide rod can move along its axial direction under the restriction of the guide hole.

2. The stator core segment lifting device according to claim 1, characterized in that: It also includes side legs, which are arranged below the lifting plate, and the length of the side legs is greater than the length of the lifting hook.

3. The stator core segment lifting device according to claim 1, characterized in that: It also includes a top support leg, on which a length adjustment device is provided. The top support leg can be against the top surface of the iron core when the lifting mechanism is assembled with the iron core.

4. A method for using a stator core segment lifting device, applied to the stator core segment lifting device according to any one of claims 1 to 3, characterized in that: The steps include: Positioning steps: Adjust the position of the lifting plate so that it is directly above the iron core, control the lifting plate to fall, and adjust the lifting plate so that the guide rod enters the groove of the iron core. Adjust the height of the lifting plate so that the bottom end of the lifting hook matches the bottom surface of the target layer iron core; Clamping steps: Start the linear actuator, the outer lifting hook and the inner lifting hook move toward each other, the outer lifting hook enters the outer groove, and the inner lifting hook enters the inner groove, and the outer lifting hook and the inner lifting hook cooperate with each other to restrict the iron core to the lifting mechanism; Lifting steps: Control the lifting plate to rise and complete the lifting of the iron core.

5. The method for using the stator core segment lifting device according to claim 4, characterized in that: In the positioning step, if the height of the iron core is less than or equal to the height of the lifting hook, when adjusting the position of the lifting plate, make the side legs rest against the platform on which the iron core is placed; if the height of the iron core is greater than the height of the lifting hook, when adjusting the position of the lifting plate, make the top legs rest against the top surface of the iron core, and adjust the height of the top legs until the bottom end of the lifting hook matches the bottom surface of the target layer iron core.

6. The method for using the stator core segment lifting device according to claim 5, wherein: The bottom end of the lifting hook extends horizontally to have a limiting protrusion that can match the gap on the bottom surface of the iron core, and the limiting protrusions of the inner lifting hook and the outer lifting hook are arranged facing each other; in the clamping step, the limiting protrusion is inserted into the gap on the bottom surface of the target layer iron core under the drive of the linear actuator.

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