Lifting device for interior of cavity of disc shaft structural part and using method of lifting device

Abstract

The invention belongs to the technical field of aero-engine assembly, and particularly relates to a lifting device for the interior of a disc shaft structural part cavity and a using method.The device comprises a shell, a lifting ring is arranged at the upper end of the shell, a linkage structure and a force bearing unit are arranged in the shell, and one end of the linkage structure is connected with a handle located outside the shell; one end of the handle is hinged to the shell and used for controlling the bearing unit to retract and release, and the bearing unit is in contact with a lifting point of a lifted workpiece. A lifting point is designed in a cavity of a lifted workpiece, safety of lifting work is guaranteed, the handle and the force bearing unit are connected through the coupling structure, meanwhile, the coupling structure is adjusted through the handle, retraction and release of the force bearing unit can be effectively controlled, and quick assembly and quick disassembly of the lifting device on the workpiece can be achieved. The hoisting operation is simple and quick, the cooperation of multiple persons in the traditional operation is not needed, and the single-person operation and clamping can be realized; and under the condition of blind installation, the clamping quality of the lifting device on a workpiece can be ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of aero-engine assembly, and in particular relates to a lifting device inside a cavity of a disc-shaft structure and a use method thereof. Background Art

[0002] During the assembly process of a certain type of aircraft engine low-pressure disc drum, the disc shaft integral structure needs to be lifted and moved multiple times to meet the assembly and shape and position tolerance detection requirements of the components in different functional areas.

[0003] Because the workpiece being hoisted is a rotor, its outer surface is specially treated and it is an axisymmetric structure design (such as Figure 3 As shown in the figure, there are no suitable lifting points on the entire exterior, and external binding is generally used for lifting. However, this lifting method is complicated to operate, inefficient, and greatly increases labor intensity and safety hazards. Especially during the lifting process, due to the special treatment of the outer surface of the parts and their axisymmetric structural design, the safety belt is prone to friction with the surface of the parts, resulting in wear of the parts. What is more serious is that the parts may slip during the lifting process. Once they slip, the parts are very likely to fall off, which will not only cause damage to the parts, but also pose a serious threat to surrounding equipment and personnel, causing immeasurable economic losses and reputation damage to the company. Summary of the invention

[0004] The purpose of the present invention is to provide a lifting device and a method of use inside the cavity of a disk-shaft structure, so as to solve the technical problems in the prior art of lifting disk-shaft structures without external lifting points, such as complex operation, low efficiency, labor intensity and high safety hazards.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: In the first aspect, the present application discloses a lifting device inside the cavity of a disk-shaft structure, including a shell, a lifting ring is arranged at the upper end of the shell, a linkage structure and a load-bearing unit are arranged inside the shell, one end of the linkage structure is connected to a handle located outside the shell, and the other end is connected to the load-bearing unit, one end of the handle is hinged to the shell for controlling the retraction and extension of the load-bearing unit, and the load-bearing unit is in contact with the lifting point of the lifting workpiece.

[0006] Preferably, the handle comprises a grip and a connecting rod, the grip is fixedly connected to the middle of the connecting rod, one end of the connecting rod is hinged to the linkage structure, and the other end of the connecting rod is hinged to the housing.

[0007] Preferably, the linkage structure includes a linkage rod, the upper end of which is hinged to the handle, and the lower end of which is hinged to the load-bearing unit through a hinge; a spring baffle is sleeved on the linkage rod, and the spring baffle is clamped inside the shell for radial positioning of the linkage rod, and a spring is arranged under the spring baffle, one end of the spring is connected to the spring baffle, and the other end is connected to the lower end of the linkage rod.

[0008] Preferably, the load-bearing unit includes a left hook plate and a right hook plate, and the ends of the left hook plate and the right hook plate are hinged by a pin; and the left hook plate and the right hook plate are respectively hinged to the linkage structure, and the left hook plate and the right hook plate can be retracted into the shell and also unfolded to the outside of the shell under the control of the handle and the linkage structure. A load-bearing plate is provided below the left hook plate and the right hook plate in the shell, and locking pins are respectively provided on the load-bearing plate corresponding to the left hook plate and the right hook plate, so as to ensure the horizontal unfolding of the left hook plate and the right hook plate.

[0009] Preferably, buffer pads are provided on both the left hook plate and the right hook plate.

[0010] Preferably, a positioning shaft, a pin hole and a fixing platform are provided on the shell. The positioning shaft is adapted to the shaft section inside the lifting workpiece. The pin hole is opened at the lower end of the shell for fixing the load-bearing unit. The fixing platform is arranged inside the shell for radial positioning of the linkage structure.

[0011] Preferably, when the handle is pressed down, the load-bearing unit is retracted, and when the handle is lifted up, the load-bearing unit is unfolded.

[0012] In a second aspect, the present application discloses a method for using a lifting device inside a cavity of a disk-shaft structure, comprising: S1: Connect the lifting ring to the lifting equipment; S2: Press the handle to make the linkage structure control the retracting of the load-bearing unit; S3: Insert the lifting device deep into the lifting workpiece, so that the load-bearing unit reaches the lifting point and the shell contacts the shaft section inside the workpiece; S4: Release the handle, the linkage structure controls the unfolding of the load-bearing unit, and the load-bearing unit contacts the lifting point; start the lifting equipment and lift the workpiece.

[0013] Preferably, the linkage structure comprises a linkage rod, a spring baffle, a spring and a hinge; the method comprises: S1: Connect the lifting ring to the lifting equipment; S2: Press the handle to move the linkage rod upward, compress the spring, and rotate the hinge to fold up the load-bearing unit; S3: Insert the lifting device deep into the lifting workpiece, so that the load-bearing unit reaches the lifting point and the shell contacts the shaft section inside the workpiece; S4: Release the handle, the linkage rod moves downward under the elastic force of the spring, the hinge rotates in the opposite direction, and the load-bearing unit is driven to unfold, and the load-bearing unit contacts the lifting point; start the lifting equipment and lift the workpiece.

[0014] Preferably, the load-bearing unit comprises a left hook plate, a right hook plate, a load-bearing plate and a thrust pin, and the method comprises: S1: Connect the lifting ring to the lifting equipment; S2: Press down the handle to make the linkage structure control the retraction of the left hook plate and the right hook plate; S3: Insert the lifting device deep into the lifting workpiece, so that the load-bearing unit reaches the lifting point and the shell contacts the shaft section inside the workpiece; S4: Release the handle, the linkage structure controls the left hook plate and the right hook plate to unfold, and the left hook plate and the right hook plate are in contact with the lifting point; start the lifting equipment and lift the workpiece.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present application discloses a lifting device inside the cavity of a disk-shaft integral structural member, which innovatively designs the load-bearing lifting point inside the cavity of the lifting workpiece to ensure the safety of the lifting operation, and connects the handle and the load-bearing unit through a coupling structure. At the same time, by adjusting the coupling structure through the handle, the retraction and extension of the load-bearing unit can be effectively controlled, thereby realizing the quick installation and removal of the lifting device on the workpiece; making the lifting operation simple and quick, and not requiring the cooperation of multiple people as in traditional operations. By adopting the present device, single-person operation and clamping can be realized; in the case of blind installation, the clamping quality of the lifting device on the workpiece can be guaranteed; and the lifting device disclosed in the present application has a compact design structure, simple use method, convenient maintenance, and low cost; and is designed and manufactured as an integrated unit, and there is no need to assemble the lifting device when in use.

[0016] Furthermore, a positioning shaft is designed on the shell of the present application, and the positioning shaft is adapted to the shaft section inside the lifting workpiece, thereby realizing the axial and radial positioning of the entire device inside the lifting workpiece. At the same time, a pin shaft hole is opened on the shell for positioning the load-bearing unit; a fixed table is designed for radial positioning of the linkage structure, so that the entire device is positioned in an integrated manner to prevent the workpiece from tilting during the lifting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the shell removal structure of the present invention; Figure 3 It is a schematic diagram of the structure for lifting workpiece.

[0019] Among them: 1-handle; 101-handle; 102-connecting rod; 2-housing; 201-positioning shaft; 202-pin shaft hole; 203-fixed platform; 3-lifting ring; 4-left hook plate; 5-right hook plate; 6-anti-pitching pin; 7-load-bearing plate; 8-buffer pad; 9-pin shaft; 10-linkage rod; 11-spring baffle; 12-spring; 13-hinge; A-hanging point; B-shaft section. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0023] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0024] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings: The innovative design of the present invention is suitable for lifting a disc-shaft integral structural part on an aircraft engine, where the lifting point is inside the workpiece cavity, and the diameter of the workpiece axis hole is Φ80mm≤the workpiece axis hole diameter≤Φ123mm, the axial length of the workpiece is 80mm≤107mm, and the weight of the workpiece is 21kg≤59kg. It is a convenient, fast, safe and reliable lifting device. Figure 1 , Figure 2 A lifting device inside the cavity of a disk-shaft structure comprises a shell 2, a lifting ring 3 is arranged at the upper end of the shell 2, a linkage structure and a load-bearing unit are arranged inside the shell 2, one end of the linkage structure is connected to a handle 1 located outside the shell 2, and the other end is connected to the load-bearing unit, one end of the handle 1 is hinged to the shell 2 for controlling the retraction and extension of the load-bearing unit, and the load-bearing unit is in contact with the lifting point of the lifting workpiece.

[0027] Directions: S1: Connect the lifting ring 3 to the lifting equipment; S2: Press down the handle 1 to make the linkage structure control the retracting of the load-bearing unit; S3: Insert the lifting device deep into the lifting workpiece, so that the load-bearing unit reaches the lifting point and the housing 2 contacts the shaft section inside the workpiece; S4: Release handle 1, the linkage structure controls the load-bearing unit to unfold, and the load-bearing unit contacts the lifting point; start the lifting equipment and lift the workpiece.

[0028] In some embodiments, a lifting device inside the cavity of a disk-shaft structure includes a shell 2, a lifting ring 3 is provided at the upper end of the shell 2, a linkage structure and a load-bearing unit are provided inside the shell 2, one end of the linkage structure is connected to a handle 1 located outside the shell 2, and the other end is connected to the load-bearing unit, one end of the handle 1 is hinged to the shell 2, and is used to control the retraction and extension of the load-bearing unit, and the load-bearing unit is in contact with the lifting point of the lifting workpiece; the handle 1 includes a handle 101 and a connecting rod 102, the handle 101 is fixedly connected to the middle part of the connecting rod 102, one end of the connecting rod 102 is hinged to the linkage structure, and the other end is hinged to the shell 2.

[0029] Directions: S1: Connect the lifting ring 3 to the lifting equipment; S2: Press down the handle 101, and the connecting rod 102 connected to one end of the linkage structure moves upward, so that the linkage structure retracts the load-bearing unit upward; S3: Insert the lifting device deep into the lifting workpiece, so that the load-bearing unit reaches the lifting point and the housing 2 contacts the shaft section inside the workpiece; S4: Release handle 1, the linkage structure controls the load-bearing unit to unfold, and the load-bearing unit contacts the lifting point; start the lifting equipment and lift the workpiece.

[0030] In some embodiments, a lifting device inside the cavity of a disk-shaft structure includes a shell 2, a lifting ring 3 is provided at the upper end of the shell 2, a linkage structure and a load-bearing unit are provided inside the shell 2, one end of the linkage structure is connected to a handle 1 located outside the shell 2, and the other end is connected to the load-bearing unit, one end of the handle 1 is hinged to the shell 2 for controlling the retraction and extension of the load-bearing unit, and the load-bearing unit is in contact with the lifting point of the lifting workpiece; the linkage structure includes a linkage rod 10, the upper end of the linkage rod 10 is hinged to the handle 1, and the lower end is hinged to the load-bearing unit through a hinge 13; a spring baffle 11 is provided on the linkage rod 10, the spring baffle 11 is in contact with the inside of the shell 2 for positioning, a spring 12 is provided below the spring baffle 11, one end of the spring 12 is connected to the spring baffle 11, and the other end is connected to the lower end of the linkage rod 10.

[0031] Directions: S1: Connect the lifting ring 3 to the lifting equipment; S2: Press the handle 1 to move the linkage rod 10 upward, compress the spring 12, and rotate the hinge 13, driving the load-bearing unit to be retracted; S3: Insert the lifting device deep into the lifting workpiece, so that the load-bearing unit reaches the lifting point and the housing 2 contacts the shaft section inside the workpiece; S4: Release the handle 1, the linkage rod 10 moves downward under the elastic force of the spring 12, and the hinge 13 rotates in the opposite direction, driving the load-bearing unit to unfold, and the load-bearing unit contacts the lifting point; start the lifting equipment and lift the workpiece.

[0032] In some embodiments, the load-bearing unit includes a left hook plate 4 and a right hook plate 5, and the ends of the left hook plate 4 and the right hook plate 5 are hinged by a pin shaft 9; and the left hook plate 4 and the right hook plate 5 are respectively hinged to the linkage structure. Under the control of the handle 1 and the linkage structure, the left hook plate 4 and the right hook plate 5 can be retracted into the shell 2, and can also be unfolded to the outside of the shell 2. A load-bearing plate 7 is arranged below the left hook plate 4 and the right hook plate 5 in the shell 2, and a thrust pin 6 is respectively arranged on the load-bearing plate 7 corresponding to the left hook plate 4 and the right hook plate 5, which is used to ensure the horizontal unfolding of the left hook plate 4 and the right hook plate 5.

[0033] Directions: S1: Connect the lifting ring 3 to the lifting equipment; S2: Press down the handle 1 to make the linkage structure control the retraction of the left hook plate 4 and the right hook plate 5; S3: Insert the lifting device deep into the lifting workpiece, so that the load-bearing unit reaches the lifting point and the housing 2 contacts the shaft section inside the workpiece; S4: Release the handle 1, the linkage structure controls the left hook plate 4 and the right hook plate 5 to unfold, and the left hook plate 4 and the right hook plate 5 are in contact with the lifting point; start the lifting equipment and lift the workpiece.

[0034] Further preferably, a buffer pad 8 is provided on both the left hook plate 4 and the right hook plate 5 .

[0035] In some embodiments, the shell 2 is provided with a positioning shaft 201, a pin shaft hole 202 and a fixing platform 203, the positioning shaft 201 is adapted to the shaft section inside the lifting workpiece, the pin shaft hole 202 is opened at the lower end of the shell 2 for fixing the load-bearing unit, and the fixing platform 203 is arranged inside the shell 2 for positioning the linkage structure.

[0036] The invention aims to provide a lifting device for a workpiece with a disk-shaft integral structure, in which the lifting point is inside the workpiece cavity and the workpiece structure is an axisymmetric structure. The device adopts an integrated structural design to achieve rapid clamping and lifting of the workpiece.

[0037] In some embodiments, the load-bearing unit of the lifting device has a design structure as shown in the figure below, which is composed of left and right hook plates, a buffer pad, a thrust pin, a load-bearing plate, a pin shaft and other parts.

[0038] The left and right hook plates are connected together by a pin shaft, so that the left and right hook plates can rotate around the pin shaft. The two thrust pins are threaded and fixed to the load-bearing plate by engaging the threaded bottom holes on the load-bearing plate. The level of the left and right hook plates is ensured by adjusting the screw-in height of the thrust pins, while bearing the weight of the workpiece being hoisted.

[0039] In some embodiments, the axial length of the linkage mechanism is in the range of 80 mm to 107 mm, and is used to realize the quick retraction and quick release of the load-bearing unit at the hanging point inside the workpiece cavity. The linkage mechanism of the lifting device is designed as follows Figure 1 It is composed of a load-bearing unit, two left and right hinges, a pin shaft, a linkage rod, a spring, a spring baffle, a handle and other parts.

[0040] The lower ends of the left and right hinges are connected to the load-bearing unit through two pins, and the upper ends are connected to the lower end of the linkage rod through a pin. The upper end of the linkage rod is connected to the handle through a pin. The linkage rod is equipped with a spring and a spring baffle, which forms a linkage mechanism of the lifting device.

[0041] In some embodiments, the handle, the spring baffle and the pin shaft of the load-bearing unit are fixed on the shell 2 respectively to realize the interaction between the linkage mechanism and the load-bearing unit. At the same time, in order to prevent the workpiece from tilting during the lifting process, a positioning shaft 201 is set on the shell 2 to realize axial and radial positioning of the shaft section inside the workpiece cavity.

[0042] The upper end of the handle 1 is fixed to the housing 2 of the lifting device through a pin shaft, the spring baffle 11 is clamped in the fixing platform 203 inside the cavity of the housing 2 to achieve axial stop, the load-bearing unit is fixed to the housing 2 through the pin shaft hole 202 on the housing, and the positioning shaft 201 realizes the radial and axial positioning of the lifting device inside the workpiece cavity. This lifting device can realize quick installation and quick removal inside the workpiece cavity, and can well solve the problem of tilting of the workpiece during lifting.

[0043] [Example] A lifting device inside the cavity of a disk-shaft integral structural member, the use method of which is implemented in the following steps: Step 1: Connect the lifting ring 3 on the lifting device housing 2 to the lifting equipment; Step 2: Press down the handle 1 to make the linkage structure pull up the left hook plate 4 and the right hook plate 5 of the load-bearing unit; Step 3: Insert the lifting device with the left hook plate 4 and the right hook plate 5 retracted into the workpiece cavity; Step 4: Loosen the handle 1, the left hook plate 4 and the right hook plate 5 on the lifting device are opened, and the left hook plate 4 and the right hook plate 5 are at the lifting point position inside the workpiece cavity; Step 5: Turn on the lifting equipment and lift the workpiece.

[0044] The present application proposes a lifting device for the inside of the disc shaft structure cavity and its use method, which cleverly utilizes the structural characteristics of the disc shaft structure itself and realizes the innovation of lifting technology. The core innovation of the device is to design the lifting load point directly inside the cavity of the workpiece to be lifted. This design not only greatly improves the safety of the lifting operation, but also effectively avoids the structural damage and safety hazards that may be caused by external lifting.

[0045] To achieve this innovative design, the device cleverly uses a coupling structure as a key component to connect the handle and the load-bearing unit. Through the operation of the handle, the user can easily adjust the coupling structure, thereby achieving precise control of the retraction and extension of the load-bearing unit. This design not only simplifies the lifting process, but also enables the lifting device to be quickly installed and disassembled on the workpiece, greatly improving work efficiency.

[0046] In actual operation, the operation process of the lifting device is simple and clear, and the lifting task can be completed without the cooperation of multiple people. Compared with the traditional lifting method, this device greatly reduces the dependence on human resources and realizes the clamping operation that can be completed by one person. Even in a blind installation environment, the device can ensure the precise clamping between the lifting device and the workpiece, thereby ensuring the quality and safety of the lifting operation.

[0047] In addition, the structural design of this lifting device also pays great attention to compactness and practicality. Its integrated design and manufacturing characteristics make it unnecessary to carry out cumbersome assembly during use, greatly simplifying the operation process. At the same time, the device also has the advantages of easy maintenance and low cost, providing users with a more economical and efficient lifting solution.

[0048] In summary, the lifting device inside the disc shaft structure cavity disclosed in this application and its use method not only innovatively solves the problems existing in the traditional lifting method, but also greatly improves the safety, efficiency and convenience of the lifting operation. Its design structure is compact, the use method is simple, the maintenance is convenient and the cost is low, providing users with a better quality and efficient lifting experience.

[0049] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A lifting device inside the cavity of a disc shaft structure, characterized in that: The invention comprises a shell (2), wherein a lifting ring (3) is arranged at the upper end of the shell (2), and a linkage structure and a load-bearing unit are arranged inside the shell (2); one end of the linkage structure is hingedly connected to a handle (1) located outside the shell (2), and the other end is connected to the load-bearing unit; one end of the handle (1) is hingedly connected to the shell (2) and is used to control the retraction and extension of the load-bearing unit; the load-bearing unit is in contact with the lifting point of the inner cavity of the lifting workpiece.

2. A lifting device inside the cavity of a disk-shaft structure according to claim 1, characterized in that: The handle (1) comprises a handle (101) and a connecting rod (102); the handle (101) is fixedly connected to the middle of the connecting rod (102); one end of the connecting rod (102) is hinged to the linkage structure, and the other end is hinged to the housing (2).

3. A lifting device inside the cavity of a disk-shaft structure according to claim 1, characterized in that: The linkage structure comprises a linkage rod (10), the upper end of the linkage rod (10) being hinged to the handle (1), and the lower end of the linkage rod (10) being hinged to the load-bearing unit via a hinge (13); a spring baffle (11) is sleeved on the linkage rod (10), the spring baffle (11) is clamped inside the housing (2) and is used for radial positioning of the linkage rod (10), a spring (12) is arranged below the spring baffle (11), one end of the spring (12) is connected to the spring baffle (11), and the other end is connected to the lower end of the linkage rod (10).

4. The lifting device inside the cavity of a disk-shaft structure according to claim 1, characterized in that: The load-bearing unit comprises a left hook plate (4) and a right hook plate (5), the ends of which are hinged via a pin (9); the left hook plate (4) and the right hook plate (5) are respectively hinged to the linkage structure; the left hook plate (4) and the right hook plate (5) can be retracted into the shell (2) or unfolded to the outside of the shell (2) under the control of the handle (1) and the linkage structure; a load-bearing plate (7) is provided below the left hook plate (4) and the right hook plate (5) in the shell (2); and locking thrust pins (6) are respectively provided on the load-bearing plate (7) corresponding to the left hook plate (4) and the right hook plate (5) for ensuring the horizontal unfolding of the left hook plate (4) and the right hook plate (5).

5. A lifting device inside the cavity of a disk-shaft structure according to claim 4, characterized in that: Buffer pads (8) are provided on both the left hook plate (4) and the right hook plate (5).

6. The lifting device inside the cavity of a disk-shaft structure according to claim 1, characterized in that: The housing (2) is provided with a positioning shaft (201), a pin hole (202) and a fixing platform (203); the positioning shaft (201) is adapted to a shaft section inside a hoisted workpiece; the pin hole (202) is provided at the lower end of the housing (2) for fixing a load-bearing unit; and the fixing platform (203) is provided inside the housing (2) for radially positioning a linkage structure.

7. The lifting device inside the cavity of a disk-shaft structure according to claim 1, characterized in that: When the handle (1) is pressed down, the load-bearing unit is retracted, and when the handle (1) is lifted up, the load-bearing unit is unfolded.

8. A method for using the lifting device inside the cavity of a disk-shaft structure according to any one of claims 1 to 7, characterized in that: include: S1: Connect the lifting ring (3) to the lifting equipment; S2: Pressing the handle (1) causes the linkage structure to control the retraction of the load-bearing unit; S3: Inserting the lifting device deep into the lifting workpiece so that the load-bearing unit reaches the lifting point and the housing (2) contacts the shaft section inside the workpiece; S4: Release the handle (1), the linkage structure controls the load-bearing unit to unfold, and the load-bearing unit contacts the lifting point; start the lifting equipment and lift the workpiece.

9. The method for using the lifting device inside the cavity of a disk-shaft structure according to claim 8, characterized in that: The linkage structure comprises a linkage rod (10), a spring baffle (11), a spring (12) and a hinge (13); the method comprises: S1: Connect the lifting ring (3) to the lifting equipment; S2: Pressing the handle (1) causes the linkage rod (10) to move upward, compressing the spring (12), and rotating the hinge (13), thereby driving the load-bearing unit to be retracted; S3: Inserting the lifting device deep into the lifting workpiece so that the load-bearing unit reaches the lifting point and the housing (2) contacts the shaft section inside the workpiece; S4: The handle (1) is released, the linkage rod (10) moves downward under the elastic force of the spring (12), the hinge (13) rotates in the opposite direction, and the load-bearing unit is driven to unfold, and the load-bearing unit contacts the lifting point; the lifting equipment is turned on and the workpiece is lifted.

10. The method for using the lifting device inside the cavity of a disk-shaft structure according to claim 8, characterized in that: The load-bearing unit comprises a left hook plate (4), a right hook plate (5), a load-bearing plate (7) and a thrust pin (6), and the method comprises: S1: Connect the lifting ring (3) to the lifting equipment; S2: Pressing the handle (1) causes the linkage structure to control the retraction of the left hook plate (4) and the right hook plate (5); S3: Inserting the lifting device deep into the lifting workpiece so that the load-bearing unit reaches the lifting point and the housing (2) contacts the shaft section inside the workpiece; S4: Release the handle (1), the linkage structure controls the left hook plate (4) and the right hook plate (5) to unfold, and the left hook plate (4) and the right hook plate (5) are in contact with the lifting point; start the lifting equipment and lift the workpiece.

Images