Rotatable lifting device

Abstract

This application relates to the field of lifting machinery technology, specifically a rotatable lifting device. The lifting device includes a supporting body for suspending on a crane; a lifting device is disposed at the bottom of the supporting body and rotatably connected to the supporting body via a rotating assembly; the rotating assembly has a vertical axis of rotation, enabling the lifting device to rotate relative to the supporting body in a horizontal plane; a drive mechanism is mounted on the supporting body and connected to the lifting device, the drive mechanism driving the lifting device to rotate around the vertical axis of rotation; a control terminal is communicatively connected to the drive mechanism, used to control the operation of the drive mechanism to rotate the lifting device and control its rotation angle. This application, through the cooperation of the supporting body, lifting device, rotating assembly, drive mechanism, and control terminal, endows the lifting device with controllable rotation angle, reducing reliance on manual adjustment of material orientation and improving operational efficiency and ease of use.

Description

Specification 1 Rotatable Lifting Device Technical Field This application relates to the field of lifting machinery technology, specifically a rotatable lifting device. Background Art In lifting operations, lifting devices such as hooks are key components used to suspend and lift materials. The lifting device is connected to the lifting cable of the crane and is moved up and down by the crane. However, the structure of such existing lifting devices is relatively fixed. The lifting device and the boom cable are usually rigidly connected and do not have the function of active rotation; or, the lifting device itself has a self-rotation function to prevent the cable from getting tangled. In actual operation, when it is necessary to adjust the spatial angle or orientation of the suspended material, since the lifting device itself cannot rotate circumferentially or its self-rotation is uncontrollable, it is often necessary to rely on manual assistance to push and pull or to use external equipment for secondary adjustment. This not only increases the difficulty and time cost of operation, but also poses the problem of collision or safety hazards caused by the uncontrollable angle of the material in some high-altitude or heavy-load scenarios. To address the technical problems mentioned in the background section, this application provides a rotatable lifting device, comprising: a supporting body for suspending on a crane; a lifting device disposed at the bottom of the supporting body and rotatably connected to the supporting body via a rotating assembly; the rotating assembly having a vertical rotation axis to allow the lifting device to rotate relative to the supporting body in a horizontal plane; a drive mechanism installed on the supporting body and connected to the lifting device, the drive mechanism driving the lifting device to rotate around the vertical rotation axis; and a control terminal communicatively connected to the drive mechanism for controlling the operation of the drive mechanism to rotate the lifting device and control its rotation angle. This application, through the coordination of the supporting body, lifting device, rotating assembly, drive mechanism, and control terminal, endows the lifting device with the functions of active rotation and controllable rotation angle, realizing controllable adjustment of the lifting device's angle in a horizontal plane, reducing reliance on manual adjustment of material orientation, and improving operational efficiency and ease of operation. Optionally, the load-bearing body includes: a boom with a hanging structure at the top for connecting the crane; and a base fixedly connected to the bottom of the boom, which rotatably engages with the rotating assembly and connects to the lifting device via the rotating assembly, supporting the lifting device. This design clearly defines the hierarchical structure of the load-bearing body, providing a stable installation foundation for the rotating assembly and ensuring effective force transmission and structural strength. Optionally, the rotating assembly includes: a thrust bearing disposed on the upper surface of the base; and a vertical shaft disposed at the center of the base, with one end connected to the thrust bearing and the other end vertically penetrating the base and connecting to the lifting device located below the base. This design utilizes the thrust bearing to bear axial loads, and the vertical shaft establishes a precise rotation center, improving the smoothness and coaxiality of the rotation process. The vertical shaft's central location on the base ensures uniform force distribution, providing a powerful condition for rotation adjustment.Optionally, the drive mechanism includes: a servo motor mounted on the base; a reducer connected to the output end of the servo motor; a first gear connected to the output end of the reducer; and a second gear fixedly connected to the lifting device and coaxially arranged with the vertical rotating shaft, the second gear meshing with the first gear. The servo motor drives the lifting device to rotate around the vertical rotating shaft via the reducer, the first gear, and the second gear. This solution provides high response and precise position control through the servo motor, and the gear transmission ensures stable torque output, achieving smooth acceleration and deceleration and precise positioning. Optionally, the servo motor and the reducer are disposed on the upper surface of the base, and a protective cover is provided on the lower surface of the base. The first gear and the second gear are disposed within the protective cover; the lifting device is disposed below the protective cover. The protective cover prevents external foreign objects from entering the gear area, improving safety; the layered layout optimizes space utilization and lowers the center of gravity. Optionally, the lifting device includes: a support plate (HK 30138177 A, Specification 3) fixedly connected to the rotating component; and at least one hanging plate fixedly connected to the support plate, the hanging plate having lifting holes for hanging objects. This solution provides a standardized load connection interface, and the lifting hole design facilitates the connection of objects using standard lifting devices, resulting in a simple and reliable structure. Optionally, the hanging plate includes a first hanging plate and a second hanging plate, arranged in a cross shape, with each of the first and second hanging plates having two lifting holes, each hole located on the same vertical plane of the vertical rotation axis and equidistant from the vertical rotation axis; or, multiple hanging plates are arranged around the vertical rotation axis, with the lifting holes on each hanging plate located on a virtual circumference centered on the vertical rotation axis, and the spacing between adjacent lifting holes being equal. The cross-shaped or circular arrangement ensures that the center of gravity of the hanging point coincides with the rotation axis, eliminating centrifugal imbalance forces during rotation and improving stability. Optionally, an outer casing is provided on the base, which partially encloses the boom. The boom's suspension structure extends out from the top of the outer casing, and the lifting device is located outside the outer casing. A battery box and an electrical control box are housed inside the outer casing. The battery box contains batteries to power the drive mechanism. The electrical control box contains a control module and a wireless module for communication with the control terminal. The battery box and electrical control box are respectively located on opposite sides of the boom. This independent power supply eliminates external cable interference; the opposite-side layout achieves symmetrical weight distribution, structurally ensuring the stability of the rotational center of gravity. Optionally, warning lights are provided on the surface of the outer casing, electrically connected to the control terminal, to indicate the operating status of the rotatable lifting device. Multiple warning lights are provided, with at least two located on opposite sides of the outer casing and at least one located on the top or bottom of the outer casing.Multi-angle lighting displays ensure that both ground personnel and crane operators can clearly identify the equipment status, improving operational safety and human-machine interaction. Optionally, the base is equipped with support legs at its bottom, the length of which is greater than the length of the lifting device along the vertical rotation axis, so that the lifting device is suspended above the ground when the support legs are on the ground. With the support legs on the ground, the lifting device is suspended, avoiding wear or contamination caused by direct contact with the ground, while providing stable temporary parking support. Compared with the prior art, this application solves the technical problems of poor rotational stability, easy center of gravity shift leading to material swaying, and inaccurate angle control of existing rotating hooks during operation, thereby achieving a comprehensive technical advantage of smooth rotation, precise control, and high degree of operational freedom. Brief Description of the Drawings To more clearly illustrate the embodiments of this application, the relevant drawings will be briefly described below. It is understood that the accompanying drawings described below are only used to illustrate some embodiments of this application, and those skilled in the art can obtain many other technical features and connections not mentioned herein based on these drawings. Figure 1 is a schematic diagram of the external appearance of the rotatable hoisting device of this application; Figure 2 is a schematic diagram of a partial cross-sectional structure of the rotatable hoisting device of this application; Figure 3 is a schematic diagram of the bottom structure of the rotatable hoisting device of this application; Figure 4 is a schematic diagram of the internal structure of the rotatable hoisting device of this application; Figure 5 is a side view of the rotatable hoisting device of this application; Figure 6 is a schematic diagram of the top hanging state of the rotatable hoisting device of this application; Figure 7 is a schematic diagram of the bottom hanging state of the rotatable hoisting device of this application; Reference numerals: 1. Hoisting arm; 11. Hanging structure; 2. Base; 3. Lifting device; 31. Bearing plate; 32. Hanging plate; 33. Lifting hole; 41. Thrust bearing; 42. Vertical rotating shaft; 51. Servo motor; 52. Reducer; 53. First gear; 54. Second gear; 55. Protective cover; 6. Outer casing; 61. Box door; 62. Battery box; 63. Electrical control box; 64. Antenna; 7. Warning light; 8. Support leg; 91. Hook body; 92. Lifting chain. Detailed Description: To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. HK 30138177 A Specification 5. The technical solutions of the embodiments of this application will be described in detail below with reference to the accompanying drawings. In the field of lifting machinery technology, the hook device, as a key component for suspending and lifting materials, directly affects the efficiency and safety of operations. Typical lifting operation scenarios usually involve lifting materials from a starting position to a target position and adjusting the spatial posture of the materials when necessary.In such scenarios, the basic components of the system typically include the main structure of the crane, the extended boom, and the hook assembly connected to the end. The main function of the hook assembly is to provide a reliable connection point to bear the weight of the material and transmit the lifting force. In existing technologies, the hook assembly and the crane boom are usually connected by steel cables. The hook assembly typically includes a hook body connected to the steel cables and a hook connected to the hook body. In one scenario, the hook and hook body are rigidly connected, with no degree of freedom of relative rotation between them. The original design intention of this structure is to ensure structural stability during the lifting process and prevent uncontrollable rotation of the material in the air; however, with the increasing complexity of the working environment, especially in situations requiring precise adjustment of the material orientation to fit mounting holes, avoid obstacles, or perform multi-angle assembly, the limitations of this rigid connection structure are becoming increasingly apparent. Another scenario involves a rotating connection between the hook and the hook body. This means the hook can rotate freely along a vertical axis during lifting to prevent cable entanglement. However, this design can cause the workpiece to spin freely during lifting, making it difficult to control its direction and posing both inconvenience and safety hazards. The aforementioned solutions, in principle, require the material's posture to be indirectly adjusted entirely by the rotation of the crane boom or the movement of the trolley, directly resulting in a severe lack of operational flexibility. When fine-tuning the material's angle in the horizontal plane is required, the lack of an end-effector rotation mechanism necessitates external force to push or pull the material, or reliance on auxiliary ropes for traction. This manual adjustment method not only increases operating time and labor costs but also introduces significant uncertainty. Further analysis reveals that materials possess considerable inertia in high-altitude operations or heavy-load lifting scenarios. Forcibly adjusting the angle manually or with external ropes can easily cause the material to sway and shake. This uncontrolled centrifugal swaying can lead to collisions between the material and surrounding structures, causing equipment damage, and may also cause the lifting device to become unstable due to a shift in the center of gravity, resulting in serious safety hazards. Furthermore, due to the lack of precise angle feedback and control mechanisms, materials often fail to remain at the expected angle, hindering subsequent assembly processes and reducing overall operational accuracy. An obvious alternative that might come to mind for those skilled in the art is to attach ropes to the outside of the lifting device and have ground personnel pull the ropes to achieve rotation. However, this approach has significant drawbacks. The tension of the external ropes is difficult to maintain consistently and uniformly, easily causing the material to tilt or sway violently during rotation. Simultaneously, ground personnel need to be in close proximity to the suspended load, violating safety regulations for working at heights and increasing the risk of injury or death. Therefore, how to achieve stable, precise, and autonomous circumferential angle adjustment of the load at the end of the lifting device without relying on uncontrollable external factors has become a pressing technical challenge in this field.In view of this, the embodiments of this application aim to provide a rotatable lifting device to solve or at least partially alleviate the above-mentioned technical problems. First Embodiment This embodiment provides a rotatable lifting device designed to achieve autonomous rotation of the lifting device in a horizontal plane, improving the accuracy of angle control and the degree of freedom of operation. The specific structure of the device will be described in detail below in conjunction with the logical hierarchy of the technical solution. First, regarding the overall architecture of the rotatable lifting device. As shown in Figure 1, the device may include a supporting body, a lifting device 3, a rotating assembly, a drive mechanism, and a control terminal. The supporting body is mainly used to suspend the device from a crane, serving as the supporting foundation for the entire device. For example, as shown in Figure 2, the top of the supporting body is provided with a ring or U-shaped structure for connecting the crane hook. The lifting device 3 is located at the bottom of the supporting body and is rotatably connected to the supporting body through the rotating assembly. The rotating assembly has a vertical rotation axis, enabling the lifting device 3 to rotate relative to the supporting body in a horizontal plane. The drive mechanism is installed on the supporting body and connected to the lifting device. This drive mechanism is used to drive the lifting device 3 to rotate around the vertical rotation axis. The control terminal communicates with the drive mechanism to control its operation, thereby rotating the spreader and controlling its angle of rotation. For example, the control terminal can be a wireless remote control, a handheld control box, or a control panel integrated into the crane cab. The beneficial effect of this overall architecture is that, through the coordination of the load-bearing body, spreader 3, rotating component, drive mechanism, and control terminal, the lifting device is given the function of active rotation and controllable rotation angle. This configuration enables the spreader 3 to adjust its angle in the horizontal plane, avoiding reliance on manual adjustment of material orientation, thus improving operational efficiency and ease of operation. Simultaneously, since the drive mechanism is integrated into the load-bearing body, there is no need for external cables to directly connect to the rotating components, eliminating the interference of external cable torsional resistance on the rotational motion. As shown in Figures 1 and 2, regarding the specific structure of the load-bearing body, it can include a boom 1 and a base 2. The boom 1 and base 2 are fixedly connected or integrally formed. The boom 1 is vertically positioned in the suspended state, while the base 2 is horizontal. A suspension structure 11 is provided at the top of the boom 1, which is used to connect the crane hook. For example, the suspension structure 11 can be a hole structure as shown in the figure, so as to hook the crane's main hook. The base 2 is fixedly connected to the bottom of the boom 1. The base 2 is rotatably engaged with the rotating assembly and is connected to the lifting device 3 through the rotating assembly. The base 2 is used to support the lifting device 3. In one embodiment, as shown in Figure 1, the base 2 can be the bottom frame structure of the outer casing 6, which is fixed to the bottom of the boom 1 by welding or bolting. The base 2 provides a platform for installing the drive mechanism and the rotating assembly, ensuring effective force transmission.The beneficial effect of this hierarchical structure is that it clarifies the specific mechanical structure of the load-bearing body to support the rotating component and the lifting device 3. The fixed connection between the boom 1 and the base 2 forms a stable rigid frame, providing a stable installation foundation for the rotating component. This structure ensures that the support structure will not deform during heavy-load lifting, thereby guaranteeing the coaxiality of the rotating component, ensuring effective force transmission and overall system stability. As shown in Figure 2, to achieve a smooth rotational connection of the lifting device 3 relative to the base 2, the rotating component may include a thrust bearing 41 and a vertical shaft 42. The thrust bearing 41 is disposed on the upper surface or internal support surface of the base 2. For example, the thrust bearing 41 may be a slewing bearing, with its outer ring fixed to the base 2 and its inner ring used to connect the rotating component. One end of the vertical shaft 42 is connected to the thrust bearing 41, and the other end vertically penetrates the base 2 to connect to the lifting device 3 located below the base 2. Preferably, the vertical rotating shaft 42 is positioned at the center of the base 2, and its bottom is fixedly connected to the lifting device 3. When the vertical rotating shaft 42 rotates, it drives the lifting device 3 to rotate synchronously, while the base 2 remains stationary. The centered design of the vertical rotating shaft 42 is beneficial for the overall force balance of the device, ensuring the smoothness of rotation adjustment. The beneficial effect of using the thrust bearing 41 and the vertical rotating shaft 42 is that the thrust bearing 41 bears the axial load, which, together with the vertical rotating shaft 42, establishes a precise rotation center. The thrust bearing 41 can bear both radial and axial loads simultaneously, improving the smoothness and coaxiality of the rotation process. This structure effectively suppresses centrifugal sway during rotation, significantly reducing the material sway amplitude. Especially under heavy load conditions, it can maintain the stability of the center of gravity and avoid tilting caused by uneven ground or load eccentricity. As shown in Figures 2 and 3, regarding the specific implementation of the drive mechanism, the drive mechanism may include a servo motor 51, a reducer 52, a first gear 53, and a second gear 54. A servo motor 51 is mounted on the base 2, and a reducer 52 is connected to the output end of the servo motor 51. For example, the input end of the reducer 52 is connected to the output shaft of the servo motor 51 (HK 30138177 A Manual 8) to reduce the speed and increase the output torque. A first gear 53 is connected to the output end of the reducer 52. The first gear 53 can be a pinion, which passes through a through hole at the bottom of the base 2. A second gear 54 is fixedly connected to the lifting device 3 and coaxially arranged with the vertical rotating shaft 42. The second gear 54 meshes with the first gear 53. The second gear 54 can be a large gear, with its inner ring fixed to the vertical rotating shaft 42 or the lifting device 3, and its outer ring meshing with the first gear 53. The servo motor 51 is used to drive the lifting device 3 to rotate around the vertical rotating shaft 42 via the reducer 52, the first gear 53, and the second gear 54.In addition, the servo motor 51 can be equipped with an encoder to provide real-time feedback on the rotation angle and speed. The servo motor 51 is connected to a controller, which is connected to a control terminal. The control terminal adjusts the output based on the feedback to achieve smooth control. Of course, in addition to the encoder, the drive mechanism can also be equipped with an angle sensor. The angle sensor is electrically connected to the controller or control terminal to provide angle information, enabling more precise control of the drive mechanism and achieving accurate angle control. In this embodiment, the servo motor 51 provides high response and precise position control, and gear transmission ensures stable torque output. With the cooperation of the reducer 52, smooth acceleration and deceleration and precise positioning are achieved, avoiding the shock during traditional motor start-stop and achieving soft start and soft stop. The encoder feedback mechanism forms a closed-loop control, allowing the controller to correct rotation errors in real time, ensuring that the lifting device 3 can accurately stop at the preset angle position, meeting the requirements of high-precision assembly operations. Regarding component protection and spatial layout, the servo motor 51 and reducer 52 can be located on the upper surface of the base 2 or within its internal cavity. A protective cover 55 is provided on the lower surface of the base 2, and the first gear 53 and the second gear 54 are disposed inside the protective cover 55. The lifting device 3 is disposed below the protective cover 55. In one embodiment, the device has an outer housing 6, which itself can serve as a protective cover, enclosing the servo motor 51 and the reducer 52 inside. The lifting device 3 is located below the outer housing 6 for hanging objects. The outer housing 6 and the protective cover 55 prevent foreign objects from entering the gear area, improving safety and avoiding wear on the transmission components from dust, rainwater, or work debris. The upper and lower layered layout optimizes space utilization and lowers the center of gravity. Placing the drive components inside the outer housing 6 and the protective cover 55, while placing the lifting device 3 on the outside, protects the precision transmission components and facilitates the loading operation of materials. This design enables the device to adapt to harsh industrial environments, extends the service life of the equipment, and maintains the compactness of the structure. The second embodiment, based on the rotatable lifting device constructed in the previous embodiment, further provides a specific structural configuration scheme for the lifting device. The key focus of this solution is optimizing the shape of the load connection end to ensure the stability and adaptability of the load during rotation, as described in HK 30138177 A specification 9. The specific composition and arrangement of the lifting device will be described in detail below. As shown in Figure 3, regarding the basic structural components of the lifting device 3, it may include a bearing plate 31 and at least one lifting plate 32. The bearing plate 31 is fixedly connected to the rotating assembly to receive the rotational torque from the rotating assembly. For example, the bearing plate 31 may be a steel plate or alloy plate of a certain thickness, and its center position is fixed to the end of the vertical rotating shaft 42 by bolts or welding.At least one hanging plate 32 is fixedly connected to the support plate 31. The hanging plate 32 is provided with a hanging hole 33 for hanging objects. For example, the hanging plate 32 can be vertically welded to the lower surface of the support plate 31, and the hanging hole 33 can be a circular or oblong hole penetrating the hanging plate 32 to accommodate shackles or slings. The advantage of this basic structure is that it provides a standardized load connection interface. The support plate 31, as an intermediate transmission component, evenly distributes the rotational torque to the hanging plate 32, avoiding stress concentration. The design of the hanging hole 33 facilitates the connection of objects using standard lifting tools, and the structure is simple and reliable, reducing manufacturing costs and maintenance difficulty. At the same time, the fixed connection between the support plate 31 and the rotating component ensures the directness of power transmission and reduces angular errors caused by transmission backlash. To further achieve load balance or adapt to objects with special shapes, the arrangement of the hanging plates can be specifically geometrically designed. In one example, referring to Figure 3, the hanging plate 32 can include a first hanging plate and a second hanging plate, which are arranged in a cross shape. The first and second hanging plates each have two hanging holes 33, each located on the same vertical plane along the vertical axis of rotation and equidistant from it. The cross-shaped arrangement means that the two hanging plates 32 are perpendicular to each other in their horizontal projection, and their intersection point lies on the axis of rotation. In another example, there can be multiple hanging plates 32, arranged around the vertical axis of rotation. The hanging holes 33 on each hanging plate 32 are located on a virtual circle centered on the vertical axis of rotation, and the spacing between adjacent hanging holes 33 is equal. For example, three or four hanging plates 32 can be arranged evenly on the circumference, with the radius of each hanging hole 33 from the center of the circle being consistent. The beneficial effect of this geometric arrangement is that the cross-shaped or circular arrangement ensures that the center of gravity of the hanging point coincides with the axis of rotation. Referring to Figure 7, when multiple chains 92 are suspended from these hanging holes, the line of action of the load's gravity can pass through or approach the vertical axis of rotation. This eliminates centrifugal imbalance forces during rotation and improves stability. Especially under heavy loads, this symmetrical layout prevents severe swaying caused by eccentric mass, protects the drive mechanism from additional radial loads, and extends the service life of the equipment. HK 30138177 A Specification 10 Combining the above-described drive mechanism and lifting device 3 configuration, the technical solution presented in this embodiment has significant advantages in terms of rotational stability. Because the center of gravity of the lifting device 3 coincides with the axis of rotation, and the drive mechanism provides precise torque control, the device can maintain stable posture during start-up and shutdown. The rotation of the material in the horizontal plane is smooth, without tilting or swaying due to a shift in the center of gravity.This not only improves operational accuracy, enabling materials to be accurately aligned with the installation position, but also reduces the psychological tension of operators caused by material movement, thus improving the human-machine interaction experience. The third embodiment, based on the rotatable hoisting device constructed in the aforementioned embodiments, further provides specific technical solutions regarding the internal electrical control integration, layout optimization, and status feedback of the device. This solution focuses on solving the energy independence problem of the device and optimizing the rotational dynamic balance through structural layout, while providing comprehensive status warning functions. The following will describe in detail the outer casing structure, internal component layout, and warning system. Regarding the external protection and integrated structure of the device, the rotatable hoisting device may include an outer casing 6. The outer casing 6 is configured to partially enclose the load-bearing body; for example, the outer casing 6 can enclose a portion of the boom 1. The hanging structure 11 of the boom 1 extends from the top of the outer casing 6 to connect to the crane's hanging device. Referring to Figure 6, typically, the crane's hanging device includes a hook body 91 and a hook, with the hook hanging below the hook body 91. The hook body 91 is used to connect the hook and the crane's steel cable. When using the lifting device of this application, the hook on the hook body 91 can be removed, and the lifting device of this application can be installed below the hook body 91. For example, the suspension structure 11 can be suspended and locked onto the mounting shaft of the hook body 91. At this time, the crane has the ability to adjust the horizontal angle when lifting the workpiece. The lifting device 3 is located outside and below the outer casing 6 to hang the workpiece. The main electrical control equipment of the lifting device is located inside the outer casing 6 and is protected by the outer casing 6. The outer casing 6 provides physical protection for the internal precision components, preventing dust, rainwater or debris from the work site from entering the device. At the same time, the layout of the suspension structure 11 extending from the top and the lifting device located outside clarifies the force transmission path, so that the external lifting force acts directly on the boom 1, while the rotational driving force is provided independently by the internal mechanism without interference. This structural division facilitates modular assembly and maintenance and improves the overall structural strength of the device. As shown in Figure 4, to achieve energy independence and optimize internal weight distribution, the outer casing 6 can be equipped with a battery box 62 and an electrical control box 63. The battery box 62 contains batteries to power the drive mechanism. The electrical control box 63 contains control modules such as a controller and a wireless module for communication with a control terminal. Crucially, the battery box 62 and electrical control box 63 can be positioned on opposite sides of the boom 1. Both can be mounted on the base 2 or fixed to supports on the left and right sides inside the outer casing 6, and are approximately symmetrical about the central axis (the axis of the vertical rotation shaft).Preferably, the outer casing 6 is configured as a polygonal column shape to facilitate balanced rotation. Multiple side walls of the outer casing 6 are also provided with doors 61, each door 61 connecting to a corresponding battery box 62, electrical control box 63, and equipment box preventing the servo motor 51, facilitating maintenance. The surface of the outer casing 6 is also provided with heat dissipation grilles to facilitate internal heat dissipation. The advantage of this symmetrical layout is that the independent power supply design eliminates the torsional resistance of external cables to the rotational motion, making the rotational motion freer and smoother, unrestricted by external wiring. More importantly, the battery box 62 and electrical control box 63 are respectively located on opposite sides of the boom 1, achieving dynamic balance of the rotating components. This layout ensures that the center of gravity of the rotating components coincides with or nearly coincides with the axis of rotation. During rotation, the weights on both sides cancel each other out, effectively suppressing centrifugal sway caused by uneven weight distribution. This structurally balanced design reduces material sway amplitude from the source, improving rotational smoothness, especially under varying load conditions, maintaining system stability and protecting the drive mechanism from additional radial loads. Referring to Figures 1, 3, and 5, for visual feedback on the device's operating status, warning lights 7 can be installed on the surface of the outer casing 6. The warning lights 7 are electrically connected to the control terminal to display the operating status of the rotatable hoisting device. For example, the warning lights 7 can be LED beads or ring-shaped light strips, and their color can change according to the equipment status, such as green when in standby, flashing yellow when rotating, and red when malfunctioning. Multiple warning lights 7 can be provided, with at least two warning lights 7 arranged on opposite sides of the outer casing 6 and at least one warning light 7 arranged on the top of the outer casing 6. Alternatively, at least one warning light 7 can be arranged on the bottom of the outer casing 6. The advantage of this multi-directional warning arrangement is that multi-angle lighting ensures that ground personnel, crane operators, and surrounding support personnel can clearly identify the equipment status. Regardless of the observer's location or height within the device, a clear status signal can be received. This enhances operational safety, facilitating operators' monitoring of equipment operation and timely risk assessment. For example, when the equipment is rotating, a flashing yellow light alerts nearby personnel to avoid it, preventing accidental collisions. This human-machine interface design enhances the equipment's adaptability to the field and reduces safety hazards caused by poor communication. The omnidirectional warning light arrangement compensates for the limitations of single-view monitoring, significantly improving the transparency of the device's status under complex operating conditions. This design not only optimizes the equipment's dynamic performance but also enhances on-site safety management through intuitive visual feedback.As shown in Figure 3, a wireless module, which can be an antenna 64, is installed at the bottom of the outer casing 6 to enable wireless connection between the control module inside the electrical control box 63 and the remote control terminal. The fourth embodiment, based on the rotatable hoisting device constructed in the aforementioned embodiments, further provides a support and protection scheme for the device when it is parked on the ground. This scheme focuses on ensuring stable placement of the device in a non-hoisting state through specific structural design, while preventing damage to the end effector. The following will describe in detail the arrangement and dimensional relationships of the support legs. As shown in Figures 1 and 5, support legs 8 can be provided at the bottom of the base 2 of the rotatable hoisting device. The support legs 8 provide support points when the device is placed on the ground. For example, the support legs 8 can be multiple columnar or plate-like structures evenly distributed around the perimeter of the base's bottom surface. The support legs 8 can be fixed to the bottom of the base 2 by welding, bolting, or integral casting. The number of support legs 8 can be three, four, or more to ensure stability during placement. The support legs 8 provide independent ground support for the device. When the device needs to be unloaded from the crane's main hook for ground maintenance, transportation, or temporary storage, the support leg 8 can bear the device's own weight, allowing it to stand stably on the ground. This avoids the device directly contacting the ground with the bottom of the spreader 3 or the housing, preventing the risk of tipping over due to uneven ground and enhancing the device's environmental adaptability and ease of maintenance. To effectively protect the spreader 3, the length of the support leg 8 can be specifically designed. The length of the support leg 8 can be greater than the length of the spreader 3 along its vertical axis of rotation. For example, if the spreader 3 includes a bearing plate 31, a lifting plate 32, and a downwardly extending hook structure, the length of the support leg 8 should ensure that when the bottom of the support leg 8 contacts the horizontal ground, the lowest point of the spreader 3 maintains a certain suspension distance from the ground. This suspension distance can range from a few centimeters to tens of centimeters, and the specific value can be adjusted according to the ground conditions and spreader dimensions in the actual application scenario. The beneficial effect of this length relationship is that the spreader is suspended above the ground when the support leg 8 is supported on the ground. Since the lifting device 3 typically contains precision rotating parts or attachment points that directly contact materials, preventing it from directly contacting the ground effectively prevents wear, contamination, or corrosion. Especially in construction sites, chemical plants, or humid environments where the ground may contain debris, standing water, or corrosive substances, the suspended design of the lifting device 3 extends its service life and reduces cleaning and maintenance costs. Simultaneously, the suspended state prevents deformation of the lifting device due to accidental collisions during placement, ensuring accuracy and safety during subsequent lifting operations.This embodiment, through the coordinated design of the support leg 8 and the lifting device 3, achieves a smooth transition from aerial operation to ground parking. Operators can safely place the device on the ground for battery replacement, inspection, or maintenance without additional padding or supports. This design not only protects critical components but also simplifies on-site operation procedures, improving the overall practicality and reliability of the equipment. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it; although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model. HK 30138177 A Claim 1 1. A rotatable hoisting device, characterized in that it comprises: a supporting body for suspending on a crane; a lifting device disposed at the bottom of the supporting body and rotatably connected to the supporting body via a rotating assembly; the rotating assembly having a vertical rotation axis to enable the lifting device to rotate relative to the supporting body in a horizontal plane; a drive mechanism installed on the supporting body and connected to the lifting device, the drive mechanism being used to drive the lifting device to rotate around the vertical rotation axis; a control terminal communicatively connected to the drive mechanism for controlling the operation of the drive mechanism to rotate the lifting device and control the rotation angle of the lifting device. 2. The rotatable hoisting device according to claim 1, characterized in that the supporting body comprises: a boom with a hanging structure at the top for connecting to a crane; a base fixedly connected to the bottom of the boom, the base rotatably engaging with the rotating assembly and connecting the lifting device via the rotating assembly, the base being used to support the lifting device. 3. The rotatable hoisting device according to claim 2, characterized in that the rotating component comprises: a thrust bearing disposed on the upper surface of the base; a vertical rotating shaft disposed at the center of the base, one end of which is connected to the thrust bearing, and the other end of which vertically penetrates the base and connects to the hoisting device located below the base. 4. The rotatable hoisting device according to claim 3, characterized in that the driving mechanism comprises: a servo motor mounted on the base; a reducer connected to the output end of the servo motor; a first gear connected to the output end of the reducer; a second gear fixedly connected to the hoisting device and coaxially arranged with the vertical rotating shaft, the second gear meshing with the first gear; the servo motor is used to drive the hoisting device to rotate around the vertical rotating shaft via the reducer, the first gear, and the second gear.HK 30138177 A Claim 2 5. The rotatable hoisting device according to claim 4, characterized in that the servo motor and the reducer are disposed on the upper surface of the base, a protective cover is disposed on the lower surface of the base, the first gear and the second gear are disposed inside the protective cover; the lifting device is disposed below the protective cover. 6. The rotatable hoisting device according to any one of claims 1 to 5, characterized in that the lifting device comprises: a bearing plate, fixedly connected to the rotating assembly; at least one lifting plate, fixedly connected to the bearing plate, the lifting plate being provided with a lifting hole for hanging objects. 7. The rotatable hoisting device according to claim 6, characterized in that the hoisting plate includes a first hoisting plate and a second hoisting plate, the first hoisting plate and the second hoisting plate are arranged in a cross shape, and the first hoisting plate and the second hoisting plate are respectively provided with two hoisting holes, each of the hoisting holes being located on the same vertical plane of the vertical rotation axis and being equidistant from the vertical rotation axis; or, the hoisting plate has multiple hoisting plates, each of the hoisting plates is arranged around the vertical rotation axis, and the hoisting holes on each of the hoisting plates are located on a virtual circumference centered on the vertical rotation axis, and the spacing between adjacent hoisting holes is equal. 8. The rotatable hoisting device according to any one of claims 2 to 5, characterized in that an outer casing is provided on the base, the outer casing partially encloses the boom, the hanging structure of the boom extends out of the top of the outer casing, and the lifting device is located outside the outer casing; a battery box and an electrical control box are provided inside the outer casing, the battery box contains a battery for powering the drive mechanism; the electrical control box contains a control module and a wireless module for communication connection with the control terminal; the battery box and the electrical control box are respectively located on opposite sides of the boom. 9. The rotatable hoisting device according to claim 8, characterized in that a warning light is provided on the surface of the outer casing, the warning light is electrically connected to the control terminal for displaying the operating status of the rotatable hoisting device; the number of warning lights is multiple, at least two warning lights are arranged on opposite sides of the outer casing, and at least one warning light is arranged on the top or bottom of the outer casing. 10. The rotatable hoisting device according to any one of claims 2 to 5, characterized in that a support leg is provided at the bottom of the base, the length of the support leg being greater than the length of the hoisting device along the vertical rotation axis, so that the hoisting device is suspended above the ground when the support leg is supported on the ground.HK 30138177 A Instruction Manual Appendix 1 Figure 1 Figure 2 HK 30138177 A Instruction Manual Appendix 2 Figure 3 Figure 4 HK 30138177 A Instruction Manual Appendix 3 Figure 5 HK 30138177 A Instruction Manual Appendix 4 Figure 6 Figure 7 HK 30138177 A.

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