A ring-shaped electro-permanent magnetic bearing hoisting device

Abstract

The application relates to the technical field of hoisting equipment, and provides a ring-shaped electric permanent magnetic bearing hoisting device which comprises a ring-shaped electric permanent magnetic chuck and a controller. The chuck comprises a working surface and a double permanent magnet magnetic circuit formed in the chuck, the working surface is a ring-shaped curved surface matched with the surface of a ring-shaped workpiece, the double permanent magnet magnetic circuit is formed by neodymium iron boron magnetic steel and aluminum-nickel-cobalt magnetic steel, is used for adsorbing the workpiece through magnetic force in a magnetized state, and releases the workpiece in a demagnetized state. The controller is electrically connected to the chuck and is used for controlling the chuck to apply a transient magnetizing or demagnetizing pulse current, and the ratio of the rated suction force of the chuck after magnetization to the maximum hoisting weight is at least 3. The application has more uniform contact surfaces, stable adsorption stress, adopts the double permanent magnet magnetic circuit structure composed of neodymium iron boron magnetic steel and aluminum-nickel-cobalt magnetic steel, realizes magnetic field reversing control by means of transient pulse current, prevents workpiece falling accidents caused by sudden power failure and line faults, and improves the safety level of hoisting the ring-shaped workpiece.

Description

Technical Field

[0001] This invention relates to the field of lifting and hoisting equipment technology, and in particular to a hoisting device with a ring-shaped electro-permanent magnet bearing. Background Technology

[0002] Currently, in the production and processing of ring-shaped carbon steel structural workpieces and large bearing ring-shaped workpieces, traditional electromagnet lifting tools, wire rope binding lifting tools, and vacuum suction cup lifting tools are commonly used for lifting operations. Among them, wire rope binding lifting has problems such as difficulty in alignment, easy clamping and deformation of workpieces, poor lifting stability, inability to achieve precise steering, and low operation efficiency; vacuum suction cups are only suitable for workpieces with flat and sealed end faces, and their adsorption and sealing performance is poor for ring-shaped hollow workpieces, making them extremely easy to fall off, posing a great safety hazard.

[0003] Traditional electromagnetic lifting devices operate in an energized mode, requiring continuous power supply throughout the entire operation, resulting in extremely high energy consumption. Furthermore, in the event of a sudden power outage, damaged wiring, or poor contact, they will instantly lose their magnetic force, directly causing the workpiece to fall, making the equipment extremely unsafe.

[0004] Meanwhile, traditional electromagnets have slow charging and demagnetizing response speeds, with a single charging and demagnetizing cycle typically lasting 8–12 seconds, resulting in a low work cycle. After demagnetization, the workpiece and suction cup surfaces retain significant magnetism, easily attracting iron powder impurities, causing scratches on the workpiece surface and producing residual magnetization, affecting the accuracy of subsequent precision machining and assembly. In addition, traditional electromagnet coils are prone to overheating and burning out, and the matching batteries need to be replaced regularly, resulting in high maintenance costs and short equipment lifespan, making them unsuitable for the long-term stable lifting requirements of large-sized, high-precision ring-shaped workpieces.

[0005] Existing electro-permanent magnet lifting tools are mostly general-purpose flat plate structures designed for lifting solid plates. They cannot be adapted to annular hollow workpieces with fixed inner and outer diameters, resulting in problems such as insufficient contact area, uneven force distribution, lifting deviation, and easy adhesion of the inner ring. Summary of the Invention

[0006] In view of this, the present invention aims to propose a ring-shaped electro-permanent magnet bearing hoisting device to solve the technical problems of poor adaptability, low safety, high energy consumption, easy magnetization of workpieces, low operation efficiency, high maintenance cost, and lack of intelligent protection in the existing technology, so as to realize safe, efficient, non-magnetized, and maintenance-free mechanized hoisting operation of large-sized ring-shaped workpieces.

[0007] To achieve the above objectives, the technical solution of the present invention is implemented as follows: A ring-shaped electro-permanent magnet bearing hoisting device includes a ring-shaped electro-permanent magnet chuck, a working surface, and a dual permanent magnet magnetic circuit formed within the chuck. The working surface is a ring-shaped curved surface that fits against the surface of the ring-shaped workpiece. The dual permanent magnet magnetic circuit is formed by neodymium iron boron magnets and AlNiCo magnets, and is used to magnetically attract the workpiece in a magnetized state and release the workpiece in a demagnetized state. The controller, electrically connected to the suction cup, is used to control the application of instantaneous magnetizing or demagnetizing pulse current to the suction cup; The ratio of the rated suction force of the suction cup after magnetization to the maximum lifting weight is at least 3.

[0008] Furthermore, the suction cup includes an annular disc body and several magnetic poles evenly distributed around the circumference of the disc body. When magnetized, it forms a three-dimensional closed magnetic circuit, allowing the magnetic lines of force to pass through the workpiece to form a loop. When demagnetized, the magnetic lines of force close inside the suction cup, and there is no residual magnetism on the surface of the workpiece.

[0009] Furthermore, the controller includes a microprocessor, a power conversion module, and a current detection module; when the controller receives a magnetization command, it outputs a pulsed DC current with a duration not exceeding 3 seconds to magnetize the suction cup; When a demagnetization command is received, a reverse pulse DC current with a duration not exceeding 3 seconds is output to demagnetize the suction cup.

[0010] Furthermore, the controller also includes a remote control receiver module for receiving wireless control commands from the remote control. The magnetization and demagnetization commands are issued through different button combinations or long press operations on the remote control.

[0011] Furthermore, the hoisting device also includes slings and spring cables mounted on the plate, the slings being used to connect to the crane hook, and the spring cables being used to electrically connect the controller and the suction cup.

[0012] Furthermore, the disc body is provided with three supports for connecting slings. The slings include multiple chains, one end of which is connected to the support, and the other ends of the multiple chains are connected together and connected to the crane hook through a connecting ring.

[0013] Furthermore, the working surface of the suction cup is also provided with one or more status indicator modules for displaying the magnetization or demagnetization status in real time.

[0014] Furthermore, the hoisting device also includes one or more sensors for real-time monitoring of the hoisting weight, magnetic flux, or suction cup posture. The sensors are electrically connected to the controller to achieve safety interlock protection.

[0015] Compared with the prior art, the present invention has the following advantages: The annular electro-permanent magnet bearing hoisting device of the present invention, by setting an annular curved working surface, can match the fitting requirements of large-sized annular workpieces. Compared with the defects of uneven fitting and local suspension of traditional flat plate hoists, the contact surface of this device is more uniform, the adsorption force is stable, and it effectively avoids problems such as displacement, deformation and slippage during the hoisting of annular workpieces.

[0016] Meanwhile, this invention employs a dual permanent magnet magnetic circuit structure composed of neodymium iron boron magnets and AlNiCo magnets, relying on instantaneous pulse current to achieve magnetic field commutation control. Unlike traditional electromagnets that are continuously energized, this invention maintains its magnetism completely after magnetization is completed and after power failure, ensuring long-term stable magnetism and preventing workpiece falls caused by sudden power outages or circuit faults. Furthermore, this device features a safety factor of 3 times the rated suction force, far exceeding industry-standard safety levels, significantly improving the safety level of lifting ring-shaped workpieces and making it suitable for heavy-duty, continuous industrial operations. Attached Figure Description

[0017] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 These are front and side view schematic diagrams of the electro-permanent magnet chuck described in an embodiment of the present invention; Figure 2 This is a magnetic circuit diagram showing the magnetization and lifting states and the demagnetization and release states of the electro-permanent magnet chuck described in this embodiment of the invention. Figure 3 This is a schematic diagram showing the external shape and installation dimensions of the controller according to an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures: 1. Disc body; 2. Magnetic poles; 3. Support; 4. Lifting slings. Detailed Implementation

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0020] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "back," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] Furthermore, in the description of this invention, unless otherwise explicitly defined, the terms "installation," "connection," "linking," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention in light of the specific circumstances.

[0022] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] This embodiment relates to a hoisting device for a ring-shaped electro-permanent magnet bearing. Overall, as shown... Figure 1 As shown, the device includes a ring-shaped electro-permanent magnet chuck and a controller. The chuck includes a working surface and a dual permanent magnet magnetic circuit formed within it. The working surface is a ring-shaped curved surface that conforms to the surface of the ring-shaped workpiece. The dual permanent magnet magnetic circuit is formed using neodymium iron boron magnets and AlNiCo magnets, used to magnetically attract the workpiece in a magnetized state and release it in a demagnetized state. The controller is electrically connected to the chuck and controls the application of instantaneous magnetization or demagnetization pulse current to the chuck. The ratio of the chuck's rated suction force after magnetization to its maximum lifting weight is at least 3.

[0024] Based on the above design concept, the annular electro-permanent magnet bearing hoisting device of this embodiment can match the fitting requirements of large-sized annular workpieces by setting an annular curved working surface. Compared with the defects of uneven fitting and local suspension of traditional flat plate hoists, the contact surface of this device is more uniform, the adsorption force is stable, and it effectively avoids problems such as displacement, deformation and slippage during the hoisting of annular workpieces.

[0025] Meanwhile, this invention employs a dual permanent magnet magnetic circuit structure composed of neodymium iron boron magnets and AlNiCo magnets, relying on instantaneous pulse current to achieve magnetic field commutation control. Unlike traditional electromagnets that are continuously energized, this invention maintains its magnetism completely after magnetization is completed and after power failure, ensuring long-term stable magnetism and preventing workpiece falls caused by sudden power outages or circuit faults. Furthermore, this device features a safety factor of 3 times the rated suction force, far exceeding industry-standard safety levels, significantly improving the safety level of lifting ring-shaped workpieces and making it suitable for heavy-duty, continuous industrial operations.

[0026] Based on the above overall introduction, this embodiment provides an exemplary structural hoisting device for a ring-shaped electro-permanent magnet bearing hoisting device. This device is suitable for hoisting carbon structural steel ring-shaped workpieces with an inner diameter of 1530mm, an outer diameter of 1700mm, and a maximum weight of 1.5 tons. It is used with a 10T overhead crane. The working environment of the equipment is suitable for subtropical monsoon climate, with a working temperature of -15℃ to 60℃, and is suitable for indoor working conditions with a maximum workpiece temperature of ≤120℃ and a maximum relative humidity of 95%.

[0027] In one preferred embodiment, the suction cup includes an annular disc body 1 and a plurality of magnetic poles 2 evenly distributed around the disc body 1. When magnetized, a three-dimensional closed magnetic circuit is formed, so that the magnetic lines of force pass through the workpiece to form a loop. When demagnetized, the magnetic lines of force close inside the suction cup, and there is no residual magnetism on the surface of the workpiece.

[0028] Specifically, the disk body 1 adopts an LCEPLM-150 / 170 type annular electro-permanent magnet chuck. The working surface of the chuck has an annular curved surface structure, which completely fits the annular workpiece to be lifted. The chuck integrates a dual magnetic source magnetic circuit structure of neodymium iron boron magnets and AlNiCo magnets, with multiple sets of magnetic poles 2 evenly arranged around the circumference to form a three-dimensional closed magnetic circuit. The equipment has a rated suction force ≥1500kg and a suction force safety factor of 3 times, which fully meets the requirements for heavy-duty safe lifting.

[0029] like Figure 2 As shown, this embodiment uses multiple sets of magnets to form a three-dimensional closed magnetic circuit, causing the magnetic lines of force to form a loop within the horizontal plane region, thereby generating a strong attractive force. The electro-permanent magnet only uses electrical energy momentarily during charging and demagnetizing; no electrical energy is needed to maintain the magnetic force during operation. The magnetic circuit conversion is fast, with a single-channel charging / demagnetizing time of ≤0.3 seconds. In the demagnetized state, the magnetic field of the AlNiCo magnet reverses, and the magnetic lines of force form a loop inside the electro-permanent magnet, leaving no residual magnetism on the working surface of the electro-permanent magnet or the workpiece.

[0030] The ring-shaped electro-permanent magnet bearing hoisting device of this embodiment does not require electricity during on-site operation. It uses the attraction force of permanent magnets to attract magnetically conductive steel, avoiding the danger of the attracted object falling off due to loss of magnetic force in the event of a sudden power outage or damage to the connecting cable. The electro-permanent magnet has a powerful attraction force of up to 20 kg / cm², which does not weaken over time, providing excellent safety.

[0031] Furthermore, since both the electro-permanent magnet and the controller are lightweight, the load on the lifting equipment can be reduced, increasing the lifting capacity and making it economical to use. There is no need for a power outage magnetization protection system, reducing the amount of batteries used and also lowering the amount of lead used.

[0032] After demagnetization, the residual magnetism on the surface of the electro-permanent magnet is almost zero. Even small magnetic particles will not adhere to the surface of magnetic pole 2, preventing scratches on the attracted object and avoiding any residual magnetism damage. The electro-permanent magnet chuck features a closed magnetic circuit design. The magnetic field generated by the permanent magnet inside the chuck forms a closed magnetic circuit primarily through magnetic pole 2 of the chuck and the attracted workpiece during operation. The magnetic field is concentrated in the area of ​​contact between the chuck and the workpiece. When the workpiece is removed, the magnetic circuit of the chuck automatically closes through its internal structure, preventing the magnetic field from leaking into the external space and thus preventing magnetization of the workpiece.

[0033] In addition, electro-permanent magnet chucks change the magnetic state of their internal magnets during magnetization or demagnetization by using a brief current. After demagnetization, the chuck's residual magnetism is very small and cannot continuously magnetize the workpiece; the workpiece will not carry magnetism after leaving the chuck.

[0034] The coil inside the electromagnet utilizes transformer coil manufacturing technology. The coil is automatically wound using a die-winding machine, resulting in a tightly packed coil with excellent insulation. It undergoes specialized vacuum impregnation, high-temperature baking and curing, precise resistance testing, and an overall withstand voltage test to ensure the coil's insulation resistance exceeds 100MΩ before leaving the factory. In this embodiment, the coil is protected by up to five layers of different insulating materials, guaranteeing insulation performance and improving the product's heat resistance, pressure resistance, moisture resistance, and impact resistance. Furthermore, the cable uses a quick-connect, pull-out connector for easy disassembly and maintenance.

[0035] See the table below for a comparison of the performance characteristics of electro-permanent magnet lifting devices and electromagnet lifting devices: Preferably, the controller includes a microprocessor, a power conversion module, and a current detection module. When the controller receives a magnetization command, it outputs a pulsed DC current lasting no more than 3 seconds to magnetize the suction cup. When it receives a demagnetization command, it outputs a reverse pulsed DC current lasting no more than 3 seconds to demagnetize the suction cup. In this embodiment, the controller is an LMSDVPL2VH301 intelligent controller. The controller's input power is AC380V±10%, 50Hz, its output instantaneous pulsed DC current is ≤DC60A, its magnetization / demagnetization time is ≤3s, and its switching interval is ≤0.25s.

[0036] The controller integrates a microprocessor, power conversion module, current detection module, and wireless remote control receiver module, supporting dual-mode operation via panel buttons and wireless remote control. A long press of a dedicated button outputs independent charging and demagnetizing commands, preventing accidental operation. It can precisely control the charging and demagnetizing pulse duration to ≤3 seconds, more than doubling the work efficiency compared to the 8-12 seconds of traditional electromagnets. By precisely switching the magnetic circuit's operating state with forward and reverse pulsed DC current, and with the current detection module monitoring the output current in real time, it ensures accurate, delay-free, and fluctuation-free magnetic circuit switching, overcoming the shortcomings of traditional electromagnets such as unstable magnetic fields, large current fluctuations, and easy coil overheating and burnout. The pulsed instantaneous operation mode precisely controls magnetic energy output with no ineffective energy consumption or magnetic field overflow, significantly improving equipment stability and control precision, making it suitable for automated production line operations.

[0037] The LMSDVPL2VH series electro-permanent magnet chuck intelligent controller in this embodiment is designed based on the working characteristics of the electro-permanent magnet chuck. Using a microprocessor as its core, it achieves optimal magnetization and demagnetization effects by adjusting the intensity and number of magnetization and demagnetization pulse currents of the electro-permanent magnet chuck. The controller's magnetic force is adjustable.

[0038] like Figure 3 As shown, the controller can achieve vehicle linkage by unlocking the input contact signal and the magnetization status output contact, and is equipped with adjustable overcurrent or short circuit protection for magnetization and demagnetization current and undercurrent or open circuit alarm functions.

[0039] All settings and operating status can be monitored through the main unit panel, and it features automatic power frequency tracking. A remote control with dual-button operation allows for remote control of the lifting device, effectively preventing misoperation. Furthermore, in the event of cable or connector damage and leakage due to mechanical impact, the leakage protection switch will activate immediately to protect the operator's safety.

[0040] Its technical parameters are as follows: ① Input power supply voltage: AC380V ② Input power frequency: 45Hz-65Hz ③ Output charging / demagnetizing pulse current: ≤60A ④ Multi-channel charging / demagnetizing switching interval: ≤0.25 seconds Do not install in environments with high levels of conductive dust, metal powder, corrosive or explosive gases; vibration should be less than 0.5G; operating temperature should be -10 to 45℃; humidity should be 20% to 90%RH, with no water droplets condensing.

[0041] Furthermore, the controller also includes a remote control receiver module for receiving wireless control commands from the remote control. Magnetizing and demagnetizing commands are issued via different button combinations or long-press operations on the remote control. The wireless remote control receiver module uses independent button long-press triggering command logic to distinguish between magnetizing and demagnetizing operations, effectively avoiding accidental touches and misoperations. It abandons the traditional fixed panel close-range operation mode, supporting long-range wireless control, allowing operators to work away from hazardous lifting areas, thus mitigating personal safety risks from workpiece falls and magnetic field interference. Simultaneously using both the control panel and remote control dual operation modes, it offers strong fault tolerance and wide adaptability, allowing a single person to complete the entire process of workpiece positioning, magnetizing, lifting, demagnetizing, and unloading, effectively saving labor costs and improving operational convenience.

[0042] like Figure 3 As shown, the controller in this embodiment operates in the following states: Standby mode: Ensure the remote control is in normal standby mode. After power-on, the digital window should display a number between 0 and 16. The controller can only perform charging and demagnetizing operations in standby mode or when the channel's operating status is displayed. Normally, the controller is in this state after being powered on.

[0043] Channel working status display: Press in standby mode Entering in 1 second, the four vertical segments at the top of the digital display window represent 1 to 4 from right to left. Channel operating status. Off: Indicates the corresponding channel is not working; Solid on: Indicates the corresponding channel is charging and demagnetizing normally; Fast flashing (flash period less than 0.6S): Indicates overcurrent during charging and demagnetizing of the corresponding channel (Note: In this case, please note...). a. Check if the upper limit of the magnetizing current is set too low; b. Check if the magnetizing intensity is set too high; c. Check if the insulation of the connecting wires is normal; d. Check if there is a partial short circuit in the internal winding of the chuck); Slow flash (flickering period greater than 0.8S): indicates that the corresponding channel has insufficient current for magnetizing and demagnetizing (at this time, pay attention to: a. Check if the lower limit of the magnetizing current is set too high; b. Check if the magnetizing intensity is set too low; c. Check if the connecting wires have good contact; d. Check if there is an open circuit in the internal winding of the chuck).

[0044] Channel charging / demagnetizing pulse current display status: Press in standby mode Press the key 1S to enter. The leftmost digit in the digital display window shows the channel number, and the rightmost two digits show the charging and demagnetizing pulse current of that channel. For example, a digital display of 1=30 indicates that the most recent current of the electro-permanent magnet chuck connected to channel 1 was 30A. Press the ▲ or ▼ key to select the display channel; press... or Press the key to return to standby mode.

[0045] Charging and demagnetizing operations After powering on the controller, confirm that the remote control and control panel are in normal standby mode.

[0046] Magnetizing: With the controller in standby mode, press the ▲ or ▼ key to adjust the magnetizing / demagnetizing intensity to the desired value, and simultaneously press the button on the remote control panel. and Press the key for more than 1 second, and the controller will execute the magnetization command. If everything is normal, the magnetization indicator light will stay on, and the bright three-color light will stay on green; otherwise, the red indicator light will flash as an alarm, indicating that magnetization was unsuccessful. You need to check the cause and repeat the above operation.

[0047] b. Demagnetization: Place the controller in standby mode, press the ▲ or ▼ key to adjust the charging / demagnetizing intensity control to the required value, and simultaneously press the ∩ and ▼ keys on the remote control panel. Press the key for more than 1 second, and the controller will execute the demagnetization command. If normal, the demagnetization indicator light will be constantly on, and the bright tri-color light will be constantly yellow; otherwise, the red indicator light will flash as an alarm, indicating that demagnetization was unsuccessful. The cause needs to be checked, and the above operation repeated.

[0048] Note: During the charging and demagnetizing operations, the controller display will flash rapidly. At this time, the human body must not carry magnetic items to contact the workpiece, and must maintain a certain safe distance from the electro-permanent magnet chuck.

[0049] As a preferred embodiment, such as Figure 1 As shown, the hoisting device in this embodiment also includes slings and spring cables mounted on the plate. The slings are used to connect to the crane hook, and the spring cables are used to electrically connect to the controller and the suction cup.

[0050] Preferably, the disc body is provided with three supports 3 for connecting the lifting slings 4. The lifting slings 4 include multiple chains, one end of which is connected to the support 3, and the other ends of the multiple chains are connected together and connected to the workpiece through a connecting ring. Figure 1 As shown, three sets of lifting supports 3 are evenly arranged around the circumference of the annular disc. LCKJH-3 type lifting slings 4 are used, with a rated lifting capacity of ≥10 tons. Multiple chains bear the force evenly, and the bottom ends are connected to the crane hook, ensuring stable and balanced lifting. The equipment is equipped with 3*4 square millimeter spiral spring cables, with a maximum spread length of 15m, adaptable to the crane's lifting stroke, 100% duty cycle, and IP54 protection rating, ensuring stable dynamic power supply.

[0051] In addition, the working surface of the suction cup is equipped with one or more status indicator modules to display the magnetization or demagnetization status in real time. Specifically, the working surface of the suction cup is equipped with a high-brightness LED tri-color status indicator module to display the standby, magnetization, demagnetization, and fault status in real time.

[0052] In addition, the hoisting device in this embodiment also includes one or more sensors for real-time monitoring of the hoisting weight, magnetic flux, or suction cup attitude. The sensors are electrically connected to the controller to achieve safety interlock protection. Simultaneously integrating a weight sensor, magnetic flux sensor, and attitude sensor, and electrically connected to the controller, forms an intelligent interlock protection system that can monitor the operating status in real time, automatically alarm and lock the operation in abnormal conditions.

[0053] The specific interlocking protection principle is as follows: Various sensors collect dynamic data in real time throughout the hoisting process, including the actual hoisting weight of the workpiece, the real-time magnetic flux value of the suction cup working surface, and the horizontal tilt angle and attitude parameters of the suction cup, and transmit the analog signals to the controller in real time; The controller has preset rated load threshold, effective magnetic flux threshold, and allowable tilt angle threshold, and the microprocessor performs high-speed comparison and judgment between the real-time collected data and the preset safety threshold.

[0054] When real-time data is within the safe threshold range, the controller responds normally to magnetization, hoisting, and demagnetization commands, and the equipment can operate normally. When abnormal conditions occur, such as overload hoisting, insufficient magnetic flux leading to insufficient adsorption force, excessive tilting of the suction cup, or workpiece displacement and detachment, the controller immediately triggers the hardware interlock protection logic, instantly locking the equipment's magnetization and hoisting permissions, prohibiting the crane from hoisting, and simultaneously triggering a fault alarm. The LED indicator switches to a red fault state, forcibly terminating the dangerous operation process. This achieves fault prediction, operation locking, and status indication safety protection, ensuring the safety and stability of ring workpiece hoisting operations.

[0055] The working process of the hoisting device in this embodiment is as follows: After the equipment is powered on, the controller enters standby mode. The operator adjusts the magnetization intensity via remote control or panel, aligns the annular suction cup with the end face of the annular workpiece, and presses and holds the magnetization button. The controller outputs a positive instantaneous pulse DC current, activating the dual magnetic source circuit. The magnetic fields of the two types of magnets are superimposed in the same direction, and the magnetic lines of force form an external closed loop through the suction cup and the workpiece, stably adsorbing the workpiece. After successful magnetization, the green indicator light stays on, and the crane can be started to complete the hoisting and turning operations.

[0056] After the workpiece is hoisted to the designated position, press and hold the demagnetize button. The controller outputs a reverse instantaneous pulse DC current, reversing the magnetic field of the AlNiCo magnet. The magnetic fields of the two magnetic sources cancel each other out, and the magnetic lines of force close inside the suction cup. There is no residual magnetism or adhesion on the workpiece surface, and the yellow indicator light stays on, completing the unloading process. If overload, abnormal magnetic force, or equipment tilt occurs during the operation, the sensor module will provide real-time feedback signals, and the controller will immediately trigger the interlock protection, terminating the operation and activating the red alarm.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hoisting device for annular electro-permanent magnet bearings, characterized in that, include: An annular electro-permanent magnet chuck includes a working surface and a dual permanent magnet magnetic circuit formed within the chuck. The working surface is an annular curved surface that fits against the surface of the annular workpiece. The dual permanent magnet magnetic circuit is formed by neodymium iron boron magnets and AlNiCo magnets, and is used to magnetically attract the workpiece in a magnetized state and release the workpiece in a demagnetized state. The controller, electrically connected to the suction cup, is used to control the application of instantaneous magnetizing or demagnetizing pulse current to the suction cup; The ratio of the rated suction force of the suction cup after magnetization to the maximum lifting weight is at least 3.

2. The hoisting device for annular electro-permanent magnet bearings according to claim 1, characterized in that: The suction cup includes a ring-shaped disc body (1) and a plurality of magnetic poles (2) evenly distributed around the circumference of the disc body (1), forming a three-dimensional closed magnetic circuit when magnetized, so that the magnetic lines of force pass through the workpiece to form a loop; During demagnetization, the magnetic lines of force close inside the chuck, leaving no residual magnetism on the workpiece surface.

3. The hoisting device for annular electro-permanent magnet bearings according to claim 2, characterized in that: The controller includes a microprocessor, a power conversion module, and a current detection module; When the controller receives a magnetization command, it outputs a pulse DC current lasting no more than 3 seconds to magnetize the suction cup. When a demagnetization command is received, a reverse pulse DC current with a duration not exceeding 3 seconds is output to demagnetize the suction cup.

4. The hoisting device for annular electro-permanent magnet bearings according to claim 3, characterized in that: The controller also includes a remote control receiver module for receiving wireless control commands from the remote control. The magnetization and demagnetization commands are issued through different button combinations or long press operations on the remote control.

5. The hoisting device for annular electro-permanent magnet bearings according to claim 2, characterized in that: The hoisting device also includes a sling (4) and a spring cable mounted on the disc (1). The sling (4) is used to connect the workpiece, and the spring cable is used to electrically connect the controller and the suction cup.

6. The hoisting device for annular electro-permanent magnet bearings according to claim 5, characterized in that: The disc body (1) is provided with three supports (3) for connecting slings (4). The slings (4) include multiple chains. One end of each chain is connected to the support (3), and the other ends of the multiple chains are connected together and connected to the crane hook through a connecting ring.

7. The hoisting device for annular electro-permanent magnet bearings according to claim 6, characterized in that: The working surface of the suction cup is also equipped with one or more status indicator modules for displaying the magnetization or demagnetization status in real time.

8. The hoisting device for annular electro-permanent magnet bearings according to claim 1, characterized in that: The hoisting device also includes one or more sensors for real-time monitoring of hoisting weight, magnetic flux, or suction cup posture. The sensors are electrically connected to the controller to achieve safety interlock protection.

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