Annular workpiece hoisting device and method

Abstract

The present invention relates to the field of machining and hoisting of large annular workpieces, and specifically to a device and method for hoisting annular workpieces, comprising: a hoisting support mechanism, comprising a main crossbeam; a center of gravity position detection mechanism, comprising a distance sensor arranged on the main crossbeam and a reflective member arranged on a mid-plane of the workpiece, for detecting the distance between the main crossbeam and the mid-plane of the workpiece, and determining whether the hoist is at the center of gravity of the workpiece; an automatic clamping mechanism, respectively arranged at both ends of the main crossbeam, each automatic clamping mechanism comprising a hook, and the two hooks can move toward or oppositely along the axial direction of the main crossbeam under the drive of a first drive device to clamp the workpiece; a safety locking mechanism, arranged at the center position of the main crossbeam, comprising a stop pin and a second drive device, the second drive device driving the stop pin to move to a specified position along the radial direction of the workpiece, and clamping on the workpiece, driving the entire hoisting device to move in the reverse direction, and fine-tuning the position of the hoisting device.

Description

Technical Field

[0001] The present invention relates to the field of machining and hoisting of large annular workpieces, and in particular to an annular workpiece hoisting device and method. Background Art

[0002] Large annular workpieces (such as large cylinders) have diameters ranging from φ3000mm to φ5000mm and weigh between 25t and 50t. Due to their weight and volume, the annular workpieces are generally designed as split structures and need to be assembled before use. Therefore, high precision is required after assembly. Large cylinders require parallel assembly, that is, horizontal assembly. Horizontal assembly has extremely high requirements for lifting. The workpiece must be horizontal after lifting and cannot be offset. Currently, large annular workpieces are designed as two-half structures, and horizontal assembly must be ensured.

[0003] Existing lifting techniques often rely on sling wrapping, which takes a long time, can severely damage the sling due to sharp edges on the workpiece, and results in poor lifting reliability. The center of gravity cannot be maintained, leading to large horizontal deviation errors during workpiece lifting. To meet such stringent lifting requirements, a sling with sufficient rigidity and adaptability cannot be used to meet production and processing requirements. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a ring-shaped workpiece lifting device and method, which can effectively ensure the smooth lifting of the cylinder body from the blank state to machining and finally to the completion of processing, forming and assembly. The entire device is assembled and used to ensure the safety, efficiency and reliability of the lifting and improve production efficiency.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0006] In a first aspect, an embodiment of the present invention provides an annular workpiece lifting device, comprising:

[0007] A hoisting support mechanism comprising a main body beam;

[0008] A center of gravity position detection mechanism, which is used to detect the distance between the main crossbeam and the center plane of the workpiece, and determine whether the main crossbeam is at the vertical plane position of the center of gravity of the workpiece;

[0009] The automatic clamping mechanism comprises two automatic clamping mechanisms, each of which is provided at both ends of the main crossbeam, each of which comprises a hook, and the two hooks are driven by a first driving device to reciprocate along the axis of the main crossbeam;

[0010] A safety locking mechanism is arranged at the center position of the main crossbeam, and includes a stop pin and a second drive device. The second drive device drives the stop pin to move to a specified position along the radial direction of the workpiece and is stuck on the workpiece, driving the entire lifting device to move in the reverse direction to adjust the horizontal position of the lifting device.

[0011] As a further technical solution, the hoisting support mechanism further includes a triangular rib plate, which is fixed to the top of the main beam.

[0012] As a further technical solution, the hoisting support mechanism further includes two tracks, which are located at both ends of the main beam.

[0013] As a further technical solution, a limit block for limiting the moving position of the hook is also provided on the track.

[0014] As a further technical solution, a plurality of mechanical anti-slip keys are provided on the track, and a baffle cooperating with the mechanical anti-slip keys is provided on the hook.

[0015] As a further technical solution, the mechanical anti-slip key includes a static key and a dynamic key. The bottom surface of the static key is welded to the track, and the bottom surface of the dynamic key is connected to the track through a spring; the contact surface between the static key and the baffle is an outward convex arc shape, and the contact surface between the dynamic key and the baffle is an inward concave arc shape, and the vertical surface between the dynamic key and the track is in contact with the vertical surface between the static key and the track.

[0016] As a further technical solution, the first driving device includes a first servo motor and a first reducer, and the first servo motor and the first reducer are connected to the main crossbeam; the first reducer is connected to the first ball screw, and a first sliding block is provided on the first ball screw, and the first sliding block is connected to the hook.

[0017] As a further technical solution, the second drive device includes a second servo motor and a second reducer, and the second servo motor and the second reducer are connected to the main crossbeam; the second reducer is connected to the second ball screw, and a second sliding block is provided on the second ball screw, and the second sliding block is connected to the stop pin.

[0018] In a second aspect, based on the above-mentioned annular workpiece lifting device, an embodiment of the present invention further provides a lifting method as follows:

[0019] Step 1. Obtain the center of gravity of the workpiece;

[0020] Step 2. Use the center of gravity position detection mechanism to confirm the position of the main beam from the center plane, and adjust the position of the vertical center plane using the hook;

[0021] Step 3. Confirm whether the workpiece is level after lifting. If not, adjust it directly through the automatic clamping mechanism and safety locking mechanism to make the workpiece level;

[0022] Step 4. After the workpiece is hoisted into place, release the safety locking mechanism and return the hook to its maximum stroke before removing the sling to complete the hoisting.

[0023] The beneficial effects of the above embodiments of the present invention are as follows:

[0024] 1. The present invention achieves the lifting of large annular workpieces through the coordinated use of a lifting support mechanism, a center of gravity position detection mechanism, an automatic clamping mechanism, and a safety locking mechanism. This effectively solves the problem of large annular workpieces being hoisted using slings during machine tool processing. It also solves the problems of slings being easily cut and requiring long protection times. This increases the lifting speed and reduces the lifting time from 2 hours per piece to 20 minutes per piece, increasing the safety factor. This improves production efficiency and ensures safe production.

[0025] 2. The lifting device proposed by the present invention has strong versatility and high utilization rate, realizes universal lifting of semi-annular workpieces, and reduces production costs.

[0026] 3. This method of lifting will not cause deformation of the workpiece, reducing energy waste caused by deformation and horizontal error of the workpiece during lifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0028] Figure 1 This is a schematic structural diagram of the present invention in use;

[0029] Figure 2 is a schematic diagram of the hoisting support mechanism disclosed in the present invention;

[0030] Figure 3 It is a schematic diagram of the center of gravity position detection mechanism disclosed in the present invention;

[0031] Figure 4 is a schematic diagram of the automatic clamping mechanism disclosed in the present invention;

[0032] Figure 5 Schematic diagram of a mechanical anti-slip key in the automatic clamping mechanism disclosed in the present invention;

[0033] Figure 6 is a schematic diagram of the safety locking mechanism disclosed in the present invention;

[0034] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for reference only.

[0035] 1 workpiece, 1-1 center plane;

[0036] 2 hoisting support mechanism, 2-1 main beam, 2-2 rib plate, 2-3 track, 2-4 limit block;

[0037] 3 center of gravity position detection mechanism, 3-1 infrared distance sensor, 3-2 reflective element;

[0038] 4 Automatic clamping mechanism, 4-1 first servo motor, 4-2 first reducer, 4-3 reducer flange, 4-4 slider flange, 4-5 hook, 4-5-1 baffle, 4-6 mechanical anti-slip key, 4-6-1 dynamic key, 4-6-2 static key, 4-6-3 spring, 4-7 first ball screw, 4-8 first sliding block;

[0039] 5 safety locking mechanism; 5-1 second servo motor, 5-2 second reducer, 5-3 stop pin, 5-4 locking sliding rod, 5-5 second ball screw; 5-6 second sliding block. DETAILED DESCRIPTION

[0040] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0041] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise clearly indicated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "comprising" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations;

[0042] It should be understood that the main structure of the annular workpiece is a circular ring, so the centripetal side is the inner side and the centrifugal side is the outer side. Based on this basic orientation, the inside and outside in the present invention are accurately defined.

[0043] It should be understood that along the height direction of the annular workpiece, the annular workpiece can also be regarded as an upper and lower structure, which serves as the upper and lower orientation reference system in the present invention.

[0044] As introduced in the background technology, in order to solve the above technical problems, the deficiencies in the existing technology are proposed in this embodiment. A large annular workpiece lifting device is provided. The lifting device in this embodiment is illustrated by taking the cylinder lifting as an example; the hoisted workpiece 1 is in a blank state of two half-cylinders separated, and the single-side half-cylinder is in a vertically placed state, and the blank state has no processing features.

[0045] In a typical embodiment of the present invention, Figure 1 As shown, the hoisting device disclosed in this embodiment mainly consists of four parts, including a hoisting support mechanism 2, a center of gravity position detection mechanism 3, an automatic clamping mechanism 4, and a safety locking mechanism 5;

[0046] A lifting support mechanism 2, comprising a main crossbeam 2-1;

[0047] The center of gravity position detection mechanism 3 includes a distance sensor 3-1 provided on the main crossbeam and a reflector 3-2 provided on the middle facet 1-1 of the workpiece 1, and is used to detect the distance between the main crossbeam 2-1 and the middle facet 1-1 of the workpiece 1, and determine whether the main crossbeam 2-1 is at the center of gravity position of the workpiece 1;

[0048] The automatic clamping mechanism 4 includes two automatic clamping mechanisms 4, which are respectively arranged at both ends of the main cross beam 2-1. Each automatic clamping mechanism 4 includes a hook 4-5 and a first driving device. The hook 4-5 can move back and forth along the axis direction of the main cross beam 2-1 under the drive of the first driving device.

[0049] The safety locking mechanism 5 is arranged at the center position of the main cross beam 2-1, and includes a stop pin and a second drive device. The second drive device drives the stop pin to move to the specified position along the radial direction of the workpiece and is stuck on the workpiece, driving the entire lifting device to move in the reverse direction to fine-tune the position of the lifting device.

[0050] Specifically, the structure of the hoisting support mechanism 2 in this embodiment is as follows: Figure 2 As shown, the mechanism consists of a main crossbeam 2-1, a rib plate 2-2, a track 2-3, and a limit block 2-4. The main crossbeam 2-1 is the load-bearing part of the entire structure and is made of a heat-treated integral steel plate. To increase the rigidity of the main crossbeam 2-1, a rib plate 2-2 is welded to the upper portion of the main crossbeam 2-1. The rib plate 2-2 and the main crossbeam 2-1 are made of the same material to ensure the overall load-bearing capacity of the lifting device. Preferably, the rib plate 2-2 in this embodiment is a triangular rib plate 2-2, and the triangular rib plate 2-2 is symmetrically arranged relative to the center line of the main crossbeam 2-1.

[0051] Furthermore, the aforementioned track 2-3 comprises two tracks, which are welded near the ends of the main crossbeam 2-1 and located at the bottom of the main crossbeam 2-1. The track 2-3 can increase the rigidity of the main crossbeam 2-1 while ensuring its own function. The main function of the track 2-3 is to connect with the hook 4-5 of the automatic clamping mechanism 4, ensuring that the hook 4-5 can slide back and forth along it to adjust the lifting range of the lifting device, and at the same time, it will bear the force of the hook 4-5 during lifting. Preferably, the track 2-3 in this embodiment adopts the existing T-shaped track.

[0052] Furthermore, two of the above-mentioned limit blocks 2-4 are also provided, and the limit blocks 2-4 are welded to the main cross beam 2-1 and the track 2-3, and are respectively located at the end of the two tracks 2-3, to limit the extreme position of the hook 4-5 of the automatic clamping mechanism 4 during the sliding process, to prevent the hook 4-5 of the automatic clamping mechanism 4 from falling off the track 2-3 due to operational errors and causing safety hazards.

[0053] The hoisting support mechanism 2 is the main body of the entire hoisting device. When the workpiece is hoisted, it bears the weight of the entire workpiece. It is connected to the lifting equipment upward, which plays a role in expanding the processing range of the workbench. It is connected to other structures downward to serve as the main support of other structures and supports the workpiece, bearing the weight of the entire workpiece and ensuring the level of the workpiece. The rigidity of the hoisting support mechanism 2 directly affects the safety and stability of the hoisting. Generally, the diameter of large cylinder workpieces is between φ3000cm and φ5000cm, and the weight range is between 25t and 50t. Therefore, the hoisting support mechanism 2 adopts a triangular rib 2-2 support structure to ensure stability and rigidity. The lower part of the hoisting support mechanism 2 needs to be connected to the hook 4-5 of the automatic clamping mechanism 4 while ensuring its smooth sliding and high load-bearing capacity. Therefore, the design form of the track 2-3 is adopted here. At the same time, to prevent the first sliding block 4-8 ​​in the automatic clamping mechanism 4 from sliding out of the first ball screw 4-7, a limit block 2-4 is also designed on the main crossbeam 2-1 to prevent electrical limit abnormalities.

[0054] Furthermore, the center of gravity position detection mechanism 3 in this embodiment is as follows: Figure 3As shown, the center of gravity position detection mechanism 3 primarily consists of infrared distance sensors 3-1 and reflectors 3-2. The infrared sensors 3-1 are mounted on the triangular ribs 2-2 of the lifting support mechanism 2, one on each side, to ensure that the sling is parallel to the center plane 1-1 of the workpiece 1. The reflectors 3-2 possess magnetic force and, when in use, are attracted to the two center planes 1-1 of the workpiece 1. This facilitates detecting the distance from the center plane 1-1 to the sling to determine whether the lifting support mechanism 2 is at the center of gravity of the workpiece 1. Because both machining and cylinder assembly require that the workpiece 1 be hoisted horizontally and without deviation, the position of the lifting point is also highly critical. Only when the lifting point and the center of gravity of the workpiece 1 are aligned vertically can the workpiece 1 be guaranteed to remain horizontally stable after lifting. This can be achieved by asymmetrically adjusting the automatic clamping mechanisms 4 on both sides in a direction parallel to the length of the lifting support mechanism 2. However, such adjustment is not possible in a direction perpendicular to the lifting support mechanism 2. Therefore, the center of gravity position detection mechanism 3 is used to determine the position in this direction. First, the center of gravity position of the workpiece 1 is simulated by three-dimensional software or obtained by other methods, and the distance between the center of gravity position and the facet 1-1 in the workpiece 1 is measured. The direction position is determined by the reflector 3-2 and the infrared distance sensor 3-1. If there is a certain small deviation, simple fine-tuning can be performed through the safety locking mechanism 5 to ensure that the workpiece 1 is absolutely level after lifting.

[0055] The automatic clamping mechanism 4 in this embodiment is as follows Figure 4 、 Figure 5As shown, the automatic clamping mechanism 4 mainly consists of a first servo motor 4-1, a first reducer 4-2, a reducer flange 4-3, a first ball screw 4-7, a first sliding block 4-8, a slider flange 4-4, a mechanical anti-slip key 4-6, and a hook 4-5. The first servo motor 4-1 is directly integrated into the first reducer 4-2, which is connected to the main crossbeam 2-1 via the reducer flange 4-3. The first reducer 4-2 has a self-locking function, which ensures that the hook 4-5 will no longer slide relative to the preset position after moving, thereby ensuring the reliability of the lifting. One end of the first ball screw 4-7 is connected to the output shaft of the first reducer 4-2. The slider flange 4-4 is inserted into the first ball screw 4-7 and is connected to the sliding block 4-8 ​​of the first ball screw 4-7 by bolts. The slider flange 4-4 is also connected to the hook 4-5 by bolts, ensuring that the first ball screw 4-7 can effectively drive the hook 4-5 to move during rotation to adjust the distance. The hook 4-5 is connected to the T-track 2-3 of the lifting support mechanism 2 through a T-slot structure. Lubricating oil is present between the two, effectively providing lubrication. The mechanism can withstand heavy loads while ensuring smooth sliding. At the same time, a mechanical limit block is designed at the end of the track, fundamentally ensuring that the hook 4-5 will not encounter problems due to soft limit failure. In order to effectively ensure the safety of the lifting, a mechanical anti-slip key 4-6 is also designed on the mechanism. Although the first reducer 4-2 itself has a self-locking function, a mechanical anti-slip key 4-6 is designed in the mechanism for safety reasons. The mechanical anti-slip key 4-6 mainly consists of a dynamic key 4-6-1, a static key 4-6-2, and a spring 4-6-3. The static key 4-6-2 and the T-track 2-3 are integrated and evenly distributed on the T-track 2-3, forming a quarter-circular structure. The dynamic key 4-6-1 is equivalent to the concave arc shape of the long side of an isosceles triangle and is used in combination with the static key 4-6-2. During normal use, due to the slow movement speed of the hook 4-5, the baffle 4-5-1 climbs upward along the concave arc of the moving key 4-6-1, so the moving key 4-6-1 will pop out normally under the action of the spring 4-6-3, ensuring that the hook 4-5 passes normally. When the movement speed of the hook 4-5 is greater than the design speed, the excessive speed will cause the hook 4-5 to maintain horizontal movement under the action of inertia, and the baffle 4-5-1 will contact the concave arc horizontally, compressing the moving key 4-6-1 downward, allowing the hook 4-5 to compress the spring 4-6-3 of the moving key 4-6-1, so that the static key 4-6-2 will contact the baffle 4-5-1 on the hook 4-5, ensuring that the hook 4-5 no longer moves, thereby playing a safety protection role.

[0056] Furthermore, the shape of the above-mentioned hook 4-5 can be designed according to the shape of the matching surface between the workpiece 1 and the hook 4-5. In this embodiment, since the matching surface between the workpiece 1 and the hook 4-5 is a stepped shape, the hook 4-5 in this embodiment adopts an L-shaped hook.

[0057] The primary function of the automatic clamping mechanism 4 in this embodiment is to bear the weight of the workpiece 1 when it is being hoisted. One is provided at each end of the main crossbeam 2-1 and used in combination. Secondly, because both automatic clamping mechanisms 4 are equipped with independent drive units (corresponding to the first servo motor 4-1 and first reducer 4-2 described above), the hooks 4-5 at each end can independently move left and right to adjust the entire hoisting position to ensure that it is horizontal. When used in combination with the center of gravity position detection mechanism 3, this ensures that the hoisting point is located directly above the center of gravity of the workpiece 1, ensuring that the workpiece 1 is hoisted horizontally. Here, as long as both hooks 4-5 are fully engaged with the workpiece 1, the self-locking action of the first reducer 4-2 ensures that they will not move relative to the workpiece 1, ensuring safe hoisting.

[0058] The safety locking mechanism 5 in this embodiment is as follows Figure 6 As shown, the safety locking mechanism 5 is mainly composed of a second servo motor 5-1, a second reducer 5-2, a stop pin 5-3, a locking sliding rod 5-4, a second ball screw 5-5, and a second sliding block 5-6; wherein the second servo motor 5-1 is directly integrated on the second reducer 5-2, and the second reducer 5-2 is connected to the triangular rib 2-2 of the lifting support mechanism 2 through the reducer flange, and the second reducer 5-2 in this embodiment has a self-locking function, which can effectively ensure that the stop pin 5-3 does not move after the position is determined; the locking sliding rod 5-4 is directly welded to the main crossbeam 2-1, the locking sliding rod 5-4 is parallel to the second ball screw 5-5, the stop pin 5-3 is sleeved on the locking sliding rod 5-4, one end of the second ball screw 5-5 is connected to the output shaft of the second reducer 5-2, and the other end is connected to the output shaft of the second reducer 5-2. One end is suspended; the second sliding block 5-6 on the second ball screw 5-5 is connected to the stop pin 5-3 by a bolt, and the stop pin 5-3 can move on the locking sliding rod 5-6 driven by the ball screw 5-5 to realize the distance adjustment function; after the entire lifting device falls on the workpiece 1, the position of the lifting support mechanism 2 is adjusted first to ensure that the lifting point is directly above the center of gravity of the workpiece 1, and the second servo motor 5-1 drives the second ball screw 5-5 to rotate and drive the stop pin 5-3 to move. When the stop pin 5-3 moves to the specified position, the stop pin 5-3 is stuck in the original groove of the workpiece 1, and then drives the entire main beam 2-1 to move in the reverse direction, thereby playing the role of fine-tuning the main beam 2-1. After the fine-tuning is completed, the position is fixed by the way, which prevents the risk of the main beam 2-1 moving to the two ends of the workpiece 1.

[0059] Preferably, the above-mentioned stop pin 5-3 adopts the existing stop flange pin structure.

[0060] Based on the above hoisting device, this embodiment also provides a hoisting method, the specific implementation method is as follows:

[0061] 1. The center of gravity of the workpiece 1 is simulated by 3D software, or other calculation methods are used to obtain the center of gravity of the workpiece 1;

[0062] 2. Confirm the position of the lifting device from the center plane through the reflector 3-2 and the infrared distance sensor 3-1, and adjust the position of the vertical center plane 1-1 through the hook 4-5.

[0063] 3. Use the workpiece level detection device on the machine tool to detect whether the workpiece 1 is level after being lifted. If it is not level, it can be directly adjusted to the level of the workpiece 1 through the automatic clamping mechanism 4 and the safety locking mechanism 5.

[0064] 4. After hoisting into place, release the safety locking mechanism 5 and return the hook 4-5 to the maximum stroke before removing the sling device to complete the hoisting.

[0065] Finally, it should be noted that relational terms such as first and second are merely used to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any actual relationship or order between these entities or operations.

[0066] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Various modifications and variations are readily apparent to those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A ring-shaped workpiece lifting device, characterized in that: include: A hoisting support mechanism comprising a main body beam; A center of gravity position detection mechanism, which is used to detect the distance between the main crossbeam and the center plane of the workpiece, and determine whether the main crossbeam is at the vertical plane position of the center of gravity of the workpiece; The automatic clamping mechanism comprises two automatic clamping mechanisms, each of which is provided at both ends of the main crossbeam, each of which comprises a hook, and the two hooks are driven by a first driving device to reciprocate along the axis of the main crossbeam; A safety locking mechanism is provided at the center of the main crossbeam and includes a stop pin and a second drive device. The second drive device drives the stop pin to move to a specified position along the radial direction of the workpiece and is locked on the workpiece, thereby driving the entire lifting device to move in the reverse direction to adjust the horizontal position of the lifting device. The hoisting support mechanism further includes two tracks, which are located at both ends of the main beam; A plurality of mechanical anti-slip keys are provided on the track, and a baffle that cooperates with the mechanical anti-slip keys is provided on the hook; The mechanical anti-slip key includes a static key and a dynamic key. The bottom surface of the static key is welded to the track, and the bottom surface of the dynamic key is connected to the track through a spring. The contact surface between the static key and the baffle is an outward convex arc shape, and the contact surface between the dynamic key and the baffle is an inward concave arc shape. The vertical surface between the dynamic key and the track contacts the vertical surface between the static key and the track.

2. The annular workpiece lifting device according to claim 1, characterized in that: The hoisting support mechanism further comprises a rib plate, which is fixed on the top of the main cross beam.

3. The annular workpiece lifting device according to claim 1, characterized in that: A limiting block is also provided on the track.

4. The annular workpiece lifting device according to claim 1, characterized in that: The first driving device includes a first servo motor and a first reducer, and the first servo motor and the first reducer are connected to the main body beam; the first reducer is connected to the first ball screw, and a first sliding block is provided on the first ball screw, and the first sliding block is connected to the hook.

5. The annular workpiece lifting device according to claim 1, characterized in that: The second driving device includes a second servo motor and a second reducer, and the second servo motor and the second reducer are connected to the main body beam; the second reducer is connected to the second ball screw, and a second sliding block is provided on the second ball screw, and the second sliding block is connected to the stop pin.

6. The annular workpiece lifting device according to claim 1, characterized in that: The center of gravity position detection mechanism includes a distance sensor arranged on the main body crossbeam and a reflective member arranged on the mid-plane of the workpiece.

7. A method for hoisting an annular workpiece using the annular workpiece hoisting device according to any one of claims 1 to 6, characterized in that: as follows: Step 1. Obtain the center of gravity of the workpiece; Step 2. Use the center of gravity position detection mechanism to confirm the position of the main beam from the center plane, and adjust the position of the vertical center plane using the hook; Step 3. Confirm whether the workpiece is level after lifting. If not, adjust it directly through the automatic clamping mechanism and safety locking mechanism to make the workpiece level; Step 4. After the workpiece is hoisted into place, release the safety locking mechanism and return the hook to its maximum stroke before removing the sling to complete the hoisting.

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