Lifting device

Abstract

The utility model provides a kind of lifting equipment, comprising: support frame body;Lifting body is set in support frame body liftable;First electromagnetic component, set on lifting body;Second electromagnetic component, set on support frame body, second electromagnetic component is used to generate repulsion electromagnetic force with first electromagnetic component, to exert upward force to lifting body;Buffer assembly, set at the bottom of lifting body, at least part of buffer assembly is set to be retractable, so that buffer assembly is contacted with support frame body in preference to lifting body when lifting body descends.The present application solves the problem that the safety tong system of the existing technology lifting machine is prone to failure due to mechanical failure, response delay or external condition changes.

Description

Technical Field

[0001] This utility model relates to the field of hoisting technology, and more specifically, to a hoisting device. Background Technology

[0002] The safety clamp system of the hoist is a critical component for ensuring passenger safety. Traditional designs primarily rely on mechanical braking mechanisms. After a speed limiter detects overspeeding, a steel cable or lever mechanism drives the safety clamp to clamp the guide rail, achieving emergency braking. However, this mechanical safety clamp solution has significant drawbacks, mainly including:

[0003] 1) Mechanical wear and failure risk: The mechanical linkage mechanism is complex and is prone to failure of the safety clamp due to wear, corrosion or jamming during long-term operation. Especially in harsh working environments, the aging and wear of parts will be accelerated, increasing the possibility of accidents.

[0004] 2) Response delay problem: Mechanical transmission has inertial delay. The process from the speed limiter being triggered to the safety clamp fully clamping the guide rail usually takes 1-2 seconds. For high-speed hoists, this delay may lead to an extended braking distance, making it difficult to stop the car immediately in extreme cases.

[0005] 3) Increased operating costs: Frequent wear and tear of mechanical parts and maintenance requirements significantly increase the operating costs of the hoist, including replacing worn wire ropes, repairing or replacing safety clamps, etc., which affects the economic benefits and operating efficiency of the hoist.

[0006] 4) Sensitive to external conditions: The effectiveness of the safety clamp system is highly dependent on external conditions, such as the integrity of the wire rope and the cleanliness of the guide rail. Once these conditions change, such as the wire rope breaking or the guide rail becoming contaminated, the safety clamp may not work properly, reducing the overall safety and reliability. Utility Model Content

[0007] The main purpose of this utility model is to provide a lifting device to solve the problem that the safety clamp system of the existing hoist is prone to failure due to mechanical failure, response delay or changes in external conditions.

[0008] To achieve the above objectives, according to one aspect of the present invention, a lifting device is provided, comprising: a support frame; a lifting body, which is vertically and elliptically disposed within the support frame; a first electromagnetic component disposed on the lifting body; a second electromagnetic component disposed on the support frame, the second electromagnetic component being used to generate an electromagnetic force repelling the first electromagnetic component to apply an upward force to the lifting body; and a buffer assembly disposed at the bottom of the lifting body, at least a portion of the buffer assembly being retractably disposed so that, when the lifting body descends, the buffer assembly contacts the support frame preferentially before the lifting body.

[0009] Furthermore, the buffer components are in multiple sets, and the multiple sets of buffer components are evenly spaced along the circumference of the lifting body; the first electromagnetic component is located in the middle of the bottom surface of the lifting body, and the second electromagnetic component is located at the bottom of the support frame, opposite to the first electromagnetic component.

[0010] Furthermore, the first electromagnetic component is embedded in the lifting body, and the cross-sectional area of ​​the first electromagnetic component is 1 / 2 to 3 / 5 of the total bottom area of ​​the lifting body.

[0011] Furthermore, the buffer assembly is disposed on the bottom surface of the lifting body, the first electromagnetic component is disposed on the bottom side of the lifting body, and the second electromagnetic component is disposed on the side wall of the support frame.

[0012] Furthermore, the second electromagnetic component extends along the circumferential direction of the support frame; and / or, there are multiple first electromagnetic components, which are spaced apart along the circumferential direction of the lifting body.

[0013] Furthermore, a mounting groove is provided on the side wall of the lifting body, and at least a portion of the first electromagnetic component is embedded in the mounting groove.

[0014] Furthermore, the first electromagnetic component is disposed on the bottom surface of the lifting body and is rotatably disposed around a predetermined axis; the second electromagnetic component is disposed on the side wall of the support frame and extends along the circumferential direction of the support frame.

[0015] Furthermore, the lifting device also includes: a first monitoring component, which is signal-connected to the lifting body to detect the lifting speed of the lifting body; the first monitoring component is signal-connected to a first electromagnetic component and a second electromagnetic component respectively, and when the first monitoring component detects that the lifting speed of the lifting body is greater than a speed threshold, it transmits a signal to the first electromagnetic component and the second electromagnetic component to energize the first electromagnetic component and the second electromagnetic component.

[0016] Furthermore, the lifting device also includes a second monitoring component, which is signal-connected to the first electromagnetic component and the second electromagnetic component respectively, to monitor the magnetic field strength of the first electromagnetic component and the second electromagnetic component.

[0017] Furthermore, the buffer assembly includes a hydraulic cylinder disposed at the bottom of the lifting body, a piston rod disposed inside the hydraulic cylinder, the piston rod being telescopically disposed relative to the hydraulic cylinder, and the piston rod contacting the support frame body preferentially before the lifting body.

[0018] By applying the technical solution of this utility model, the lifting device provided in this application can immediately generate a magnetic field opposite to the first electromagnetic component when the lifting body (i.e., the car) is overspeeding or out of control, forming a strong repulsive force, which quickly limits the speed of the lifting body and achieves millisecond-level emergency response. Compared with traditional mechanical braking, this greatly shortens the braking time and reduces the risk of falling.

[0019] The generation of electromagnetic repulsion does not depend on mechanical friction, but rather on the conversion of electrical energy into magnetic force, and then into braking force. This process has high energy conversion efficiency, reduces the loss of kinetic energy into heat energy, and lowers energy consumption during braking.

[0020] Because electromagnetic force is used for braking, the first and second electromagnetic components do not need to be in physical contact, which reduces wear on mechanical parts, extends the service life of the equipment, and also reduces the need for regular maintenance, saving maintenance time and costs.

[0021] The design of the buffer assembly ensures that the car can make smooth contact with the support frame during the initial stage of emergency braking, thereby avoiding additional impact force from a hard impact. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0023] Figure 1 A schematic diagram of an embodiment of the lifting device according to the present invention is shown;

[0024] Figure 2 A schematic diagram showing the cooperation between the first electromagnetic component and the second electromagnetic component in the lifting device according to the present invention is shown.

[0025] The above figures include the following reference numerals:

[0026] 100, Support frame; 200, Lifting body; 300, First electromagnetic component; 400, Second electromagnetic component; 500, Buffer assembly; 600, First monitoring component; 700, Second monitoring component. Detailed Implementation

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] As mentioned in the background section, most existing hoists are equipped with safety clamps to prevent safety hazards caused by overspeeding and to provide emergency braking. However, safety clamps primarily rely on mechanical braking, using wire ropes or lever mechanisms to clamp the guide rails. These clamps are prone to failure due to wear, corrosion, or jamming during long-term operation, especially in harsh working environments where component aging and wear accelerate, increasing the likelihood of accidents. Frequent wear and maintenance of mechanical components significantly increase the operating costs of the hoist, including replacing worn wire ropes and repairing or replacing safety clamps, impacting the hoist's economic efficiency and operational effectiveness. Furthermore, mechanical transmission has an inertial delay; the process from the speed limiter triggering to the safety clamp fully clamping the guide rails typically takes 1-2 seconds. For high-speed hoists, this delay can lead to extended braking distances, making it difficult to stop the car immediately in extreme situations. Therefore, to address the aforementioned technical problems, the lifting device provided in this application includes a support frame 100, a lifting body 200, a first electromagnetic component 300, a second electromagnetic component 400, and a buffer assembly 500. The lifting body 200 is vertically and elliptically disposed within the support frame 100. The first electromagnetic component 300 is disposed on the lifting body 200. The second electromagnetic component 400 is disposed on the support frame 100 and is used to generate an electromagnetic force repelling the first electromagnetic component 300 to apply an upward force to the lifting body 200. The buffer assembly 500 is disposed at the bottom of the lifting body 200, and at least a portion of the buffer assembly 500 is retractably disposed so that when the lifting body 200 descends, the buffer assembly 500 contacts the support frame 100 preferentially before the lifting body 200. The generation of the electromagnetic repulsion force is completed almost instantaneously, and its response time can be controlled at the millisecond level (≤0.2 seconds), far lower than the 1-2 second delay of traditional mechanical safety clamps. This means that in emergency situations such as overspeeding of the hoist, an upward force can be applied to the car more quickly, shortening the braking distance and improving safety. The operation of the electromagnetic components (first electromagnetic component 300 and second electromagnetic component 400) does not rely on physical contact, avoiding the wear, corrosion, and jamming problems of mechanical components such as wire ropes and levers. This not only reduces the frequency of hoist maintenance and replacement costs but also extends the service life of the equipment, thereby reducing long-term operating costs and improving economic efficiency. The design of the buffer assembly 500 ensures that the car can smoothly contact the support structure at the initial stage of emergency braking, avoiding additional impact forces from hard impacts.

[0029] Please refer to Figure 1 and Figure 2This application provides a lifting device, including: a support frame 100; a lifting body 200, which is vertically and elliptically disposed within the support frame 100; a first electromagnetic component 300 disposed on the lifting body 200; a second electromagnetic component 400 disposed on the support frame 100, the second electromagnetic component 400 being used to generate an electromagnetic force repelling the first electromagnetic component 300 to apply an upward force to the lifting body 200; and a buffer assembly 500 disposed at the bottom of the lifting body 200, at least a portion of the buffer assembly 500 being retractably disposed so that when the lifting body 200 descends, the buffer assembly 500 preferentially contacts the support frame 100 before the lifting body 200.

[0030] According to the lifting device provided in this application, when the lifting body 200 (i.e., the car) experiences overspeed or loss of control, the second electromagnetic component 400 immediately generates a magnetic field opposite to the first electromagnetic component 300, forming a strong repulsive force, which quickly limits the speed of the lifting body 200, achieving a millisecond-level emergency response. Compared with traditional mechanical braking, this greatly shortens the braking time and reduces the risk of falling.

[0031] The generation of electromagnetic repulsion does not depend on mechanical friction, but rather on the conversion of electrical energy into magnetic force, and then into braking force. This process has high energy conversion efficiency, reduces the loss of kinetic energy into heat energy, and lowers energy consumption during braking.

[0032] Because electromagnetic force is used for braking, the first electromagnetic component 300 and the second electromagnetic component 400 do not need to make physical contact, which reduces the wear of mechanical parts, extends the service life of the equipment, and also reduces the need for regular maintenance, saving maintenance time and costs.

[0033] The design of the buffer assembly 500 ensures that the car can make smooth contact with the support frame 100 during the initial stage of emergency braking, thereby avoiding additional impact force from a hard impact.

[0034] Specifically, there are multiple sets of buffer components 500, which are evenly spaced along the circumferential interval of the lifting body 200; the first electromagnetic component 300 is located in the middle of the bottom surface of the lifting body 200, and the second electromagnetic component 400 is located at the bottom of the support frame 100, opposite to the first electromagnetic component 300.

[0035] Multiple sets of buffer components 500 are evenly distributed around the circumference of the lifting body 200, ensuring that the braking force can be evenly distributed around the bottom of the car during emergency braking, avoiding excessive local stress.

[0036] The first electromagnetic component 300 is located in the middle of the bottom surface of the lifting body 200, while the second electromagnetic component 400 is positioned opposite at the bottom of the support frame 100. This layout design makes the generation of electromagnetic repulsion force more concentrated and efficient, which helps the lifting body 200 maintain stability during braking and avoids the risk of swaying and tipping due to the shift of the center of gravity.

[0037] In the initial stage of braking, multiple sets of buffer components 500 can make contact with the support frame 100 before the lifting body 200. They absorb the initial impact through their expansion and contraction characteristics. Then, the electromagnetic repulsion force gradually increases, achieving a smooth transition of braking force. This design reduces the mechanical impact that may be caused by hard contact and improves the smoothness and comfort of the braking process.

[0038] The electromagnetic repulsion braking of the first electromagnetic component 300 and the second electromagnetic component 400, combined with the physical buffering of multiple sets of buffer components 500, forms a double safety redundancy. Even if the electromagnetic repulsion system cannot respond immediately under extreme circumstances, the buffer components can still play a timely role to ensure a rigid collision between the lifting body 200 and the support frame 100.

[0039] In one embodiment provided in this application, the first electromagnetic component 300 is embedded in the lifting body 200, and the cross-sectional area of ​​the first electromagnetic component 300 is 1 / 2 to 3 / 5 of the total area of ​​the bottom surface of the lifting body 200.

[0040] By setting the cross-sectional area of ​​the first electromagnetic component 300 to a larger proportion, the effective electromagnetic force interaction area between it and the second electromagnetic component 400 is directly increased. This means that during emergency braking, a larger and more uniform repulsive force can be generated, increasing the braking stability of the main body 200 and reducing the risk of structural deformation or damage caused by excessive local forces.

[0041] The larger electromagnetic action area allows for better adaptation to the emergency braking needs of the lifting body 200 under different load conditions. Under both heavy and light loads, the system provides stable and adjustable braking force, ensuring that braking performance is unaffected by load variations.

[0042] A larger cross-sectional area design helps optimize the wiring inside electromagnetic components, improve current transmission efficiency, and reduce the complexity of electrical connections.

[0043] The increased area also helps improve the heat dissipation performance of electromagnetic components, reduces the temperature of the electromagnetic coil when operating at high current, extends the service life of the equipment, and reduces maintenance requirements.

[0044] In specific implementation, the buffer component 500 is set on the bottom surface of the lifting body 200, the first electromagnetic component 300 is set on the bottom side of the lifting body 200, and the second electromagnetic component 400 is set on the side wall of the support frame 100.

[0045] When the lifting body 200 begins to descend, the buffer component 500 first contacts the support frame 100. Through its expandable characteristics, it gradually absorbs the descent kinetic energy of the car, reducing the impact force when the car suddenly contacts the support structure.

[0046] After the buffer component 500 initially absorbs the impact, the electromagnetic repulsion between the first electromagnetic component 300 and the second electromagnetic component 400 begins to play the main braking role, avoiding the additional mechanical stress that may be caused by the braking force reaching its peak instantaneously, making the braking process smoother.

[0047] The first electromagnetic component 300 is located at the bottom side of the lifting body 200. It can not only generate a downward repulsive force, but also generate a certain amount of lateral constraint force. This lateral constraint helps to maintain the stability of the car on the guide rail, reduce the possible lateral sway during braking, and improve the overall braking safety and efficiency.

[0048] The second electromagnetic component 400 is located on the side wall of the support frame 100 and can precisely repel the first electromagnetic component 300, avoiding the force dispersion that may occur in traditional mechanical braking and ensuring a concentrated and efficient braking effect.

[0049] Braking is achieved between the first electromagnetic component 300 and the second electromagnetic component 400 through electromagnetic repulsion rather than mechanical contact, which reduces direct collisions and wear between components, extends system life, and reduces maintenance frequency and cost.

[0050] In another embodiment provided in this application, the second electromagnetic component 400 extends along the circumferential direction of the support frame 100; and / or, there are multiple first electromagnetic components 300, and the multiple first electromagnetic components 300 are spaced apart along the circumferential direction of the lifting body 200.

[0051] The first electromagnetic component 300, which is arranged at intervals along the circumference, can ensure that the lifting body 200 is subjected to uniform electromagnetic repulsion force in any direction, avoiding the uneven braking phenomenon caused by local stress concentration, making the car more stable during emergency braking and reducing the impact on passengers or cargo inside.

[0052] The second electromagnetic component 400 surrounds the support frame 100, and can generate a repulsive force in an instant regardless of how the position of the lifting body 200 changes, providing all-round braking protection.

[0053] The design of multiple first electromagnetic components 300 ensures that even if one part fails to generate electromagnetic force in time due to a malfunction, the remaining parts can still function, enhancing the stability and reliability of the system and forming a more robust braking network.

[0054] Each first electromagnetic component 300 can be controlled independently. Once an abnormal working state of a component is detected, the control system can automatically adjust the electromagnetic force of other components to compensate for the failure of the component and ensure that the overall braking effect is not affected.

[0055] The circumferentially extended second electromagnetic component 400 increases the effective interaction area with the first electromagnetic component 300, resulting in a greater electromagnetic repulsion force generated per unit time and a significant improvement in braking efficiency.

[0056] In the specific implementation process, a mounting groove is provided on the side wall of the lifting body 200, and at least a part of the first electromagnetic component 300 is embedded in the mounting groove.

[0057] The design of embedding the first electromagnetic component 300 into the mounting slot reduces the space occupied by the component inside or outside the car, making the integration of the electromagnetic component and the lifting body 200 more compact and improving the overall space utilization of the equipment.

[0058] This layout facilitates the integration of the first electromagnetic component 300 with the hoisting body 200, reduces installation complexity, and makes it easier to apply the electromagnetic safety system to existing hoisting structures without requiring major modifications to the car or hoistway.

[0059] The embedded installation method protects the first electromagnetic component 300 from accidental collisions or scratches during the movement of the lifting body 200, reducing the risk of damage caused by external factors and extending the service life of the component.

[0060] The design of the mounting slot also helps to reduce electromagnetic interference from other electrical equipment in the shaft to the first electromagnetic component 300, ensuring stable operation of the system, especially in environments with high electromagnetic compatibility requirements.

[0061] The first electromagnetic component 300 is disposed on the bottom surface of the lifting body 200 and is rotatably disposed around a predetermined axis; the second electromagnetic component 400 is disposed on the side wall of the support frame 100 and extends along the circumferential direction of the support frame 100.

[0062] The rotatable design of the first electromagnetic component 300 allows for dynamic adjustment of the relative angle and force direction between it and the second electromagnetic component 400, based on the actual descent path and attitude of the lifting body 200. This ensures that even if the lifting body 200 tilts or deviates, a repulsive force can still be effectively generated, improving the accuracy and effectiveness of braking.

[0063] The second electromagnetic component 400 extends along the circumferential direction of the support frame 100, forming a ring-shaped electromagnetic force field. This not only increases the effective area, making the braking force distribution more balanced, but also provides additional lateral restraint, enhancing the stability of the lifting body 200 during braking and preventing swaying or sideslip caused by high-speed descent.

[0064] The rotation of the first electromagnetic component 300 can adjust the direction of the electromagnetic repulsive force, while the layout of the second electromagnetic component 400 can adjust the magnitude and distribution of the force. This design allows the system to flexibly adjust the braking force according to the actual load and operating status of the lifting body 200, providing a more precise and efficient braking effect.

[0065] Specifically, a drive motor is provided on the bottom surface of the lifting body 200. The drive shaft of the drive motor is driven and connected to the middle part of the first electromagnetic component 300 to ensure that the axis of the drive shaft is aligned with the center line of the first electromagnetic component 300, so as to achieve the best electromagnetic force distribution. An encoder or angle sensor is provided on the bottom surface of the lifting body 200 to monitor the rotation angle of the first electromagnetic component 300, so as to ensure that the direction of the first electromagnetic component 300 can be precisely adjusted according to the real-time speed and load conditions, as well as the position of the second electromagnetic component 400.

[0066] The lifting device also includes: a first monitoring component 600, which is signal-connected to the lifting body 200 to detect the lifting speed of the lifting body 200; the first monitoring component 600 is signal-connected to the first electromagnetic component 300 and the second electromagnetic component 400 respectively; when the first monitoring component 600 detects that the lifting speed of the lifting body 200 is greater than the speed threshold, it transmits the signal to the first electromagnetic component 300 and the second electromagnetic component 400 to energize the first electromagnetic component 300 and the second electromagnetic component 400.

[0067] The first monitoring component 600 can monitor the lifting speed of the lifting body 200 (i.e., the car) in real time and accurately, ensuring that potential overspeed or loss of control can be identified immediately when there are abnormal speed changes.

[0068] Once the speed exceeds the preset threshold, the first monitoring component 600 will quickly transmit this signal to the first electromagnetic component 300 and the second electromagnetic component 400, enabling the electromagnetic system to start within milliseconds and achieve a rapid response for emergency braking.

[0069] By monitoring the actual speed of the car, the control system can intelligently adjust the energizing current of the first electromagnetic component 300 and the second electromagnetic component 400, thereby dynamically adjusting the magnitude of the electromagnetic repulsion force to ensure that the braking process is both fast and smooth, avoiding the impact that may be caused by excessive braking.

[0070] Preferably, the first monitoring component 600 is a speed limiter.

[0071] Furthermore, the lifting device also includes a second monitoring component 700, which is signal-connected to the first electromagnetic component 300 and the second electromagnetic component 400 respectively, to monitor the magnetic field strength of the first electromagnetic component 300 and the second electromagnetic component 400.

[0072] The second monitoring component 700 can monitor the magnetic field strength of the two electromagnetic components in real time and promptly feed the data back to the control system through signal connection, ensuring that the electromagnetic safety mechanism can be accurately monitored at any time, thereby improving the system's ability to respond quickly to abnormal situations.

[0073] Based on real-time monitored magnetic field strength data, the control system can dynamically adjust the current of the first electromagnetic component 300 and the second electromagnetic component 400, thereby precisely controlling the magnitude of the electromagnetic repulsion force and ensuring optimal braking effect under different load and speed conditions.

[0074] By continuously monitoring the magnetic field strength, the second monitoring component 700 can identify potential faults in electromagnetic components at an early stage, such as core overheating or coil open circuits. This helps to carry out preventive maintenance before the components completely fail, significantly reducing the failure rate and the risk of sudden shutdowns, and reducing maintenance costs and equipment downtime.

[0075] Preferably, the second monitoring component 700 is a Hall effect sensor, a magnetoresistive sensor, or a magnetic field strength sensor.

[0076] In this application, the buffer assembly 500 includes a hydraulic cylinder disposed at the bottom of the lifting body 200, a piston rod disposed inside the hydraulic cylinder, the piston rod being telescopically disposed relative to the hydraulic cylinder, and the piston rod contacting the support frame 100 preferentially before the lifting body 200.

[0077] In emergency braking situations, due to its telescopic characteristics, the piston rod can contact the support frame 100 before other parts of the lifting body 200. The compression of the piston rod absorbs the initial impact force, thereby mitigating the severe vibration that may be caused by the hard contact between the lifting body 200 and the support structure, ensuring the safety of the equipment and passengers.

[0078] During the extension and retraction of the piston rod inside the hydraulic cylinder, the braking force can be dynamically adjusted according to the descent speed and load conditions, avoiding discomfort caused by excessive braking force and preventing brake failure due to insufficient braking force.

[0079] The contact between the piston rod and the hydraulic cylinder is designed as a low-friction sliding contact, reducing wear and extending the service life of the cushioning components. Simultaneously, the cushioning effect of the piston rod reduces the risk of direct impact to the bottom of the lifting body 200, thus reducing the maintenance requirements for the bottom structure of the lifting body 200.

[0080] The hydraulic cylinder of the buffer assembly 500 works in conjunction with the first electromagnetic component 300 and the second electromagnetic component 400. The extension and retraction state of the piston rod can serve as a prerequisite for triggering the electromagnetic component, which simplifies the logic of the control system and ensures the efficient combination of electromagnetic braking and physical buffering.

[0081] Before the electromagnetic braking system is activated, the physical buffering effect of the piston rod serves as the first line of defense. Even in the event of a malfunction in the electromagnetic system, the piston rod can independently perform buffering and braking functions, forming a double safety redundancy and enhancing the overall safety of the hoisting system.

[0082] The lifting device of this application aims to solve the failure problem of existing safety clamp systems caused by mechanical failure, response delay, or changes in external conditions. It utilizes electromagnetic force directly acting on the car (lifting body 200) to achieve millisecond-level braking, significantly improving response speed; by reducing reliance on traditional mechanical linkage mechanisms, it avoids wear and jamming risks, reducing maintenance costs; the electromagnetic system has a simple structure and is adaptable to complex working conditions, resulting in higher reliability; simultaneously, in the event of safety clamp failure, the electromagnetic repulsion mechanism can serve as a redundant braking method, forming dual protection and effectively improving the safety and operational stability of the hoist.

[0083] This application achieves safety protection for the hoist through the principle of electromagnetic repulsion, effectively improving system safety: the electromagnetic repulsion force can instantly limit the rapid descent of the car, significantly reducing the risk of falling; its simple structure eliminates the need for frequent maintenance of mechanical parts, reducing maintenance costs and extending equipment life; the electromagnetic system is unaffected by guide rail contamination or wire rope condition, making it more adaptable; its response speed reaches millisecond level (≤0.2 seconds), far exceeding the 1-2 seconds of traditional mechanical braking; at the same time, the electromagnetic device is compact, making it easy to integrate into existing hoist systems, combining high efficiency, reliability, and engineering feasibility, comprehensively optimizing safety protection performance.

[0084] This application achieves rapid braking through an electromagnetic repulsion linkage mechanism: a first electromagnetic component 300 is installed below the hoist, and a second electromagnetic component 400 is installed at the bottom of the car, forming a magnetic pole repulsion structure. When the speed limiter is triggered, the control circuit activates the first electromagnetic component 300, which generates a repulsive force with the second electromagnetic component 400, directly offsetting the kinetic energy of the car's descent. Combined with dynamic response control technology, the linkage between the speed limiter and the electromagnetic system achieves delay-free braking. The magnitude of the electromagnetic force can be adjusted to adapt to different load conditions. At the same time, a redundant protection design is adopted, with the electromagnetic system and the traditional safety clamp operating in parallel, forming dual protection to ensure reliable braking capability even in the event of a single failure, comprehensively improving the system's safety and adaptability.

[0085] This embodiment provides a hoist safety clamp failure prevention device based on an electromagnetic repulsion linkage mechanism. It achieves rapid braking through the principle of dynamic magnetic pole repulsion, significantly improving safety performance. The specific structure and parameters are as follows:

[0086] 1. Electromagnet configuration:

[0087] ① First electromagnet: installed at the bottom of the hoist shaft (i.e. the bottom of the support frame 100), using high permeability silicon steel sheets laminated iron core, with 1200 coil turns, wire diameter 1.5mm, current of 10A (DC power supply), magnetic pole surface size of 300mm×300mm, and magnetic induction intensity up to 1.8T.

[0088] ② Second electromagnet: Installed at the bottom of the car (i.e. the bottom of the lifting body 200), with a structure symmetrical to the fixed electromagnet, a magnetic pole surface size of 280mm×280mm, 1150 coil turns, wire diameter of 1.4mm, and a current of 9.5A, ensuring that the magnetic poles are the same as those of the fixed electromagnet (e.g., both are set as N poles) to achieve repulsion.

[0089] ③ Spacing adjustment mechanism: A hydraulic buffer device is installed at the bottom of the car. The initial magnetic pole spacing is 50mm. After triggering, the buffer device is compressed through the speed limiter linkage mechanism to shorten the magnetic pole spacing to 20mm to enhance the repulsive force.

[0090] 2. Control circuit system

[0091] ① The speed limiter trigger signal is acquired by the PLC controller, and the response time is ≤0.05 seconds.

[0092] ② The electromagnet power supply adopts a dual power supply redundancy design (main power supply 220V AC, backup power supply 12V DC) to ensure that the braking can still be started in the event of a power failure.

[0093] ③ The magnetic field strength sensor monitors the changes in the magnetic field between the magnetic poles in real time and feeds the feedback to the control module to dynamically adjust the current intensity.

[0094] Working principle and parameter verification

[0095] ① Braking process analysis:

[0096] When the hoist overspeeds (e.g., exceeds 120% of the rated speed), the speed limiter triggers the control circuit, energizing both the stationary and moving electromagnets simultaneously, creating magnetic poles of the same polarity. According to the Lorentz force formula... (in =4π×10 -7 (where N is the number of coil turns, I is the current, A is the magnetic pole area, and d is the magnetic pole distance). The calculation yields:

[0097] Initial state (d=50mm): Repulsive force .

[0098] Triggered state (d=20mm): Repulsive force

[0099] In actual tests, the electromagnetic repulsion force can reach 12000N, which is sufficient to counteract the weight of a 5000kg car. 24% of the total, combined with a mechanical braking system to achieve compound braking.

[0100] ② Dynamic response test:

[0101] Response time: According to high-speed camera recording, the time from when the electromagnet is energized to when the magnetic pole spacing is shortened to 20mm is 0.03 seconds, which is better than the 0.15-second response speed of traditional safety clamps.

[0102] Braking distance: Under the conditions of rated load of 5000kg and speed of 2m / s, the electromagnetic repulsion braking distance is 0.8 meters, which is 68% shorter than the 2.5 meters of the traditional safety clamp.

[0103] Energy consumption: Electromagnetic repulsion consumes the car's kinetic energy within 0.1 seconds. The energy conversion efficiency reaches 85% (experimental data: the temperature rise of the electromagnet is ≤15℃ as monitored by thermocouples).

[0104] This application provides an alternative solution based on electromagnetic induction and dynamic reluctance control. By embedding a ring-shaped permanent magnet array in the sidewall of the hoist shaft and installing a rotatable magnetic pole module at the bottom of the car, braking is achieved through changes in magnetic reluctance. When the speed limiter is triggered, the control circuit detects the car's acceleration via an electromagnetic sensor and dynamically adjusts the polarity and reluctance of the magnetic pole module to generate a reluctance torque opposite to the car's direction of motion. For example, the permanent magnets are made of neodymium iron boron material (magnetic energy product 50 MGOe), and the magnetic pole module consists of three independently controllable electromagnetic coils, each with 800 turns and a current of 12A. By adjusting the pole spacing (0.1-0.3m) and reluctance value (0.5-2.0H), a braking force of 8000N can be generated within 0.08 seconds, reducing energy consumption by 30% compared to traditional solutions. Simultaneously, the braking curve is optimized through a reluctance adaptive algorithm, reducing mechanical impact and making it suitable for different load and speed scenarios.

[0105] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0106] According to the lifting device provided in this application, when the lifting body 200 (i.e., the car) experiences overspeed or loss of control, the second electromagnetic component 400 immediately generates a magnetic field opposite to the first electromagnetic component 300, forming a strong repulsive force, which quickly limits the speed of the lifting body 200, achieving a millisecond-level emergency response. Compared with traditional mechanical braking, this greatly shortens the braking time and reduces the risk of falling.

[0107] The generation of electromagnetic repulsion does not depend on mechanical friction, but rather on the conversion of electrical energy into magnetic force, and then into braking force. This process has high energy conversion efficiency, reduces the loss of kinetic energy into heat energy, and lowers energy consumption during braking.

[0108] Because electromagnetic force is used for braking, the first electromagnetic component 300 and the second electromagnetic component 400 do not need to make physical contact, which reduces the wear of mechanical parts, extends the service life of the equipment, and also reduces the need for regular maintenance, saving maintenance time and costs.

[0109] The design of the buffer assembly 500 ensures that the car can make smooth contact with the support frame 100 during the initial stage of emergency braking, thereby avoiding additional impact force from a hard impact.

[0110] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0111] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0112] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0113] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0114] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A lifting device, characterized in that, include: Support frame (100); The lifting body (200) is vertically and flexibly installed within the support frame (100); A first electromagnetic component (300) is disposed on the lifting body (200); A second electromagnetic component (400) is disposed on the support frame (100). The second electromagnetic component (400) is used to generate an electromagnetic force that is repulsive to the first electromagnetic component (300) to apply an upward force to the lifting body (200). A buffer assembly (500) is disposed at the bottom of the lifting body (200), at least a portion of which is retractably disposed such that when the lifting body (200) descends, the buffer assembly (500) contacts the support frame (100) prior to the lifting body (200).

2. The lifting device according to claim 1, characterized in that, The buffer components (500) are in multiple sets, and the multiple sets of buffer components (500) are evenly spaced along the circumferential interval of the lifting body (200); The first electromagnetic component (300) is disposed in the middle of the bottom surface of the lifting body (200), and the second electromagnetic component (400) is disposed at the bottom of the support frame (100) and is disposed opposite to the first electromagnetic component (300).

3. The lifting device according to claim 2, characterized in that, The first electromagnetic component (300) is embedded in the lifting body (200), and the cross-sectional area of ​​the first electromagnetic component (300) is 1 / 2 to 3 / 5 of the total bottom area of ​​the lifting body (200).

4. The lifting device according to claim 1, characterized in that, The buffer assembly (500) is disposed on the bottom surface of the lifting body (200), and the first electromagnetic component (300) is disposed on the bottom side of the lifting body (200); The second electromagnetic component (400) is disposed on the side wall of the support frame (100).

5. The lifting device according to claim 4, characterized in that, The second electromagnetic component (400) extends along the circumferential direction of the support frame (100); and / or, There are multiple first electromagnetic components (300), and the multiple first electromagnetic components (300) are spaced apart along the circumferential direction of the lifting body (200).

6. The lifting device according to claim 4, characterized in that, The lifting body (200) has a mounting groove on its side wall, and at least a portion of the first electromagnetic component (300) is embedded in the mounting groove.

7. The lifting device according to claim 1, characterized in that, The first electromagnetic component (300) is disposed on the bottom surface of the lifting body (200), and the first electromagnetic component (300) is rotatably disposed about a predetermined axis; The second electromagnetic component (400) is disposed on the side wall of the support frame (100), and the second electromagnetic component (400) extends along the circumferential direction of the support frame (100).

8. The lifting device according to claim 1, characterized in that, The lifting device also includes: The first monitoring component (600) is signal-connected to the lifting body (200) for detecting the lifting speed of the lifting body (200); The first monitoring component (600) is signal connected to the first electromagnetic component (300) and the second electromagnetic component (400) respectively. When the first monitoring component (600) monitors that the lifting speed of the lifting body (200) is greater than the speed threshold, it transmits the signal to the first electromagnetic component (300) and the second electromagnetic component (400) to energize the first electromagnetic component (300) and the second electromagnetic component (400).

9. The lifting device according to claim 1, characterized in that, The lifting device also includes: The second monitoring component (700) is signal-connected to the first electromagnetic component (300) and the second electromagnetic component (400) respectively, so as to monitor the magnetic field strength of the first electromagnetic component (300) and the second electromagnetic component (400).

10. The lifting device according to claim 1, characterized in that, The buffer component (500) includes: A hydraulic cylinder is disposed at the bottom of the lifting body (200), and a piston rod is disposed inside the hydraulic cylinder. The piston rod is telescopically disposed relative to the hydraulic cylinder, and the piston rod contacts the support frame (100) preferentially before the lifting body (200).

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