154 results about "Electromagnetic drive" patented technology

This invention relates to the field of intelligent manufacturing and concrete product production equipment control technology, specifically an intelligent control system for the entire production process of concrete poles. The system includes: a reference parameter identification unit for performing a stepped acceleration test and calculating the empty mold impedance parameter characterizing the inherent mechanical resistance of the mold; a load torque observation unit for acquiring the electromagnetic drive torque in real time and extracting the net load torque acting only on the concrete material; a rheological and distribution state analysis unit for calculating the dimensionless eccentricity factor characterizing the uniformity of material distribution; and an adaptive closed-loop control unit for generating corresponding control commands: an emergency braking command is output when the eccentricity exceeds the safety limit, a constant-speed shearing command is output when the rheological state does not meet the standard, and an adaptive acceleration command is output when the rheological state meets the standard and the eccentricity is within the safe range. This invention solves the problem of the inability to directly observe the material state within a closed mold, achieving transparent monitoring of the physical properties of concrete.

The present application relates to the technical fields of deepwater drilling and workover technology of offshore oil engineering, and particularly relates to a joint for emergency release of a deepwater light drilling and workover underwater riser and an operating method thereof. The emergency release joint comprises an upper joint body and a lower joint body which are mutually butted. A locking assembly composed of a clamp and a support ring is arranged on the periphery of the butt joint, and an electromagnetic drive assembly is correspondingly arranged. Upper and lower blowout preventer modules are arranged on both sides of the butt joint along the fluid passage in axial opposition. The electromagnetic drive assembly is used to drive the support ring to move between two working positions, so as to control the locking or releasing of the clamp on the butt joint. In operation, the upper and lower blowout preventer modules are first controlled to be closed, and then the mechanical locking is released to realize the release of the joint. After reconnection, the mechanical locking is restored and the fluid passage is opened. The scheme is suitable for emergency release and subsequent reconnection of the deepwater riser under abnormal working conditions.

An actuator with a detachable stabilizer bar and a detachable stabilizer bar device are disclosed. The actuator includes an outer cylinder, first and second rod sleeves, an electromagnetic drive assembly, a movable magnetic shaft, and a locking assembly. The first and second rod sleeves, the electromagnetic drive assembly, the movable magnetic shaft, and the locking assembly are respectively disposed within the outer cylinder. The first rod sleeve is rotatably disposed at a first end of the outer cylinder, and the second rod sleeve is fixedly disposed at a second end of the outer cylinder. The electromagnetic drive assembly, the movable magnetic shaft, and the locking assembly are located between the first and second rod sleeves. The electromagnetic drive assembly includes an electromagnetic bushing; the electromagnetic bushing is fixedly connected to the outer cylinder and sleeved over the movable magnetic shaft, and is keyed to the movable magnetic shaft. The electromagnetic drive assembly drives the movable magnetic shaft to move axially to selectively connect or disconnect from the first rod sleeve. The locking assembly locks the movable magnetic shaft in a position disconnected from the first rod sleeve. This invention has a simple structure, rapid response, and high reliability.

The application discloses a permanent magnet electric drive aluminum strip tension leveling machine process parameter optimization method and system, and belongs to the technical field of metal material finishing. The method comprises the following steps: system initialization is performed, and a coupling mathematical model between process parameters and electromagnetic drive control variables is established; based on the established model, a hierarchical strategy including process parameter pre-selection, drive parameter multi-objective optimization and online fine adjustment is adopted, and an optimal process parameter set is dynamically solved; heat compensation is performed on the current instruction output by the optimization according to the real-time temperature of the permanent magnet motor, so as to offset the torque attenuation caused by temperature rise; and case data of each successful tension leveling is stored in a knowledge base, so that online self-learning and inheritance of experience are realized. The application solves the problems of straightening quality fluctuation, high energy consumption and short service life of components caused by mismatching of the permanent magnet direct drive system and traditional process parameters, and significantly improves the elongation control precision, surface quality and energy efficiency.

This invention discloses a Braille drum score teaching device, relating to the field of Braille drum score teaching technology. It includes a protective vest connected to teaching components. The teaching components include: a control assembly installed on the back of the protective vest; a control box fixedly connected to the back of the vest; a speaker fixedly connected to the control box; two sets of shoulder armor; and two sets of monitoring devices installed on the underside of the two sets of shoulder armor for monitoring the user's arm position. This Braille drum score teaching device, through the seven-degree inclined self-locking structure of the control box and the Braille display components, and electromagnetic drive transmission, achieves accurate display of the Braille drum score. It allows the blind user to read the drum score content promptly without affecting their drum practice; and it updates the Braille drum score promptly when the drum practice is correct, and pauses the update when the drum score is incorrect.

This utility model discloses an electromagnetic actuator, including a housing mechanism, a fixed iron core, a moving iron core, and an electromagnetic component. The housing mechanism includes an outer shell and an end cap. One end of the outer shell has a mounting hole, and the other end of the outer shell is fixedly connected to the end cap, forming a mounting cavity. The fixed iron core passes through the mounting hole and is inserted into the mounting cavity. The fixed iron core has a through hole. The moving iron core is slidably disposed in the through hole. The electromagnetic component includes a winding frame and a coil. The winding frame is arranged in the mounting cavity, and the coil is disposed on the winding frame. The coil is used to generate a magnetic field. The fixed iron core is sealed to the outer shell at the mounting hole. Both ends of the winding frame have first positioning grooves. The two first positioning grooves are respectively equipped with a first sealing ring and a second sealing ring. The first sealing ring abuts against the end face of the outer shell near the mounting hole, and the second sealing ring abuts against the end cap. This electromagnetic actuator not only improves sealing performance but also facilitates manufacturing and helps reduce production costs.

This invention pertains to the field of drone landing pads, specifically a universal drone landing pad and its control method. The landing pad's upper surface features two long and two short mechanical rods, which position and fix the drone in the upper left corner after landing. One of the short and one long mechanical rods can move longitudinally and laterally, respectively, and each rod contains an embedded magnet. Below the landing pad, at corresponding positions, is a short and one long electromagnetic drive device, containing an electromagnet with opposite polarity to the upper rod and a multi-axis accelerometer. The sensor detects the drone's landing status through longitudinal acceleration and calculates the movement distance through horizontal acceleration to determine whether the landing gear is securely fastened. The electromagnetic drive device uses magnetic attraction to move the upper mechanical rod horizontally, and the lateral drive device also integrates a wireless charging coil. This invention is compatible with multiple drone models and various charging power levels, eliminating the need for complex mechanical alignment and structures such as hangar covers and lifting platforms, significantly reducing costs while maintaining protection levels and reliability.

The utility model relates to the massage device of massage device driving structure field's electromagnetic drive formula sucking structure, including fixed bolster and electric control massage subassembly, electromagnetic drive source is by the casing and sets up in the coil support and cylindrical magnetic jar of casing inside constitution, the periphery of coil support is wound with the electromagnetic coil, power supply and electromagnetic coil all with main control circuit board electric connection, coil support installs in the inside of magnetic jar along the opening of magnetic jar, and can along the opening direction of magnetic jar telescopic activity, the bottom of coil support is connected with the airbag for being driven by coil support and makes the massage mouth produce negative pressure telescopic activity. When working, coil support telescopic activity along the inside of magnetic jar, thereby drive airbag along the axial direction of magnetic jar and make reciprocating motion, make the inside of sucking mouth form negative pressure, realize the technical effect of noise reduction through non - contact magnetic force drive, can absorb the part high - frequency vibration energy that coil support does linear telescopic motion produces, ensure that can eliminate part mechanical vibration feeling when working.

This invention discloses a metal thin-walled energy recovery power generation device based on time-sequential electromagnetic control, comprising a high-temperature working chamber, segmented time-sequential excitation coils, a main circulation feeding and discharging system, and a multi-stage coordinated temperature control and energy recovery power generation system. The segmented time-sequential excitation coils include multiple sets of excitation coils arranged axially around the high-temperature working chamber. The main circulation feeding and discharging system includes a main inlet and a main outlet communicating with the high-temperature working chamber. The metal working fluid enters through the main inlet and, under the action of the segmented time-sequential excitation coils, forms a dynamically conductive metal lining on the inner wall of the high-temperature working chamber. The multi-stage coordinated temperature control and energy recovery power generation system includes a coil cooling circuit and a chamber metal lining circuit. The two circuits can independently or jointly perform energy recovery, converting high-temperature heat energy into electrical energy. This device adopts a fully electromagnetic drive, with no mechanical rotation or external heating, and has advantages such as extremely simple structure, high reliability, long lifespan, wide compatibility, and good safety.

This utility model discloses a two-dimensional large-angle fast-reflecting mirror device based on a sheet-like flexible support. The flexible support component includes a hollow flexible connecting piece and a flexible connecting rod. One side of the flexible connecting piece is fixedly connected to the mirror assembly, and the other side is fixedly connected to the base. The axis of the flexible connecting rod is perpendicular to the plane of the flexible connecting piece and passes through the center of the flexible connecting piece. One end of the flexible connecting rod is fixedly connected to the center of one side of the mirror assembly, and the other end is fixedly connected to the center of one side of the mirror assembly. An electromagnetic drive component passes through the flexible connecting piece and is fixedly connected to both the mirror assembly and the base. A sensor component is fixed at the center of the base and spaced a first preset distance from the mirror assembly. By adopting a composite support structure of flexible connecting piece and flexible connecting rod and a tilted moving-magnetic drive component in synergy, a large-angle deflection capability on the order of ±10° in two dimensions is achieved.

A bistable electrical switching device (1) is provided. The bistable electrical switching device (1) includes a controller and an electromagnetic drive unit (2), wherein the electromagnetic drive unit includes a movable armature (3) movable between a first stable position and a second stable position. The controller is configured to provide a first actuation signal (800, 900) to move the movable armature (3) from the first stable position to the second stable position, wherein the first actuation signal includes at least two first pulses (801) having a first polarity, and wherein the controller and the electromagnetic drive unit are configured such that the pulses having the first polarity accelerate the armature from the first stable position toward the second stable position.

The application belongs to the technical field of robot end effector, and discloses an electromagnetic driving dexterous gripper based on soft beam bending mode switching, which comprises an outer frame, an upper part of which is provided with an electromagnetic driving module, and a lower part of which is fixed with an outer frame magnet, the electromagnetic driving module comprising an electromagnetic coil and a magnet; a soft beam driver, one end of which is connected with the magnet, and the other end of which is hingedly supported in the outer frame, the soft beam driver comprising a soft beam and a soft beam center magnet installed on the soft beam; and a finger, which is installed on the outer convex surface of the soft beam. The electromagnetic driving dexterous gripper provided by the application can pick up planar light and thin objects, and solves the problems that the existing rigid clamping jaw is difficult to pick up planar light and thin objects and the flexible clamping jaw has a slow dynamic response.

The utility model discloses an anti -seismic support hanger fatigue performance testing machine relates to fatigue test technical field. Including drive source, be used for to two opposite axial direction apply thrust, and drive source passes through the installation electromagnetic attraction half frame in two axial directions, so that the electromagnetic detection probe in the electromagnetic attraction half frame through the magnetic force adsorption, can move along the axial direction in two electromagnetic attraction half frame, the top surface of electromagnetic detection probe is used to lay with the lip sealant. The utility model discloses a deformation observation mode of two -way electromagnetic drive structure cooperation lip sealant, has realized the non -destructive testing to the fatigue damage of anti -seismic support hanger, wherein the synergic effect of electric two -way push rod and electromagnetic attraction half frame can control the axial displacement of detection probe, and the lower force handle of normal direction setting forms three -dimensional mechanics balance structure with the axial handle frame, effectively eliminates the lateral deviation error of producing in the testing process.

The application relates to the technical field of electromagnetic driving, and discloses an electromagnetic driving device, a motor and a control method of the electromagnetic driving device.The electromagnetic driving device comprises a permanent magnet, at least two magnetic cores and at least two coils; the magnetic core has a C-shaped structure; the at least two magnetic cores are oppositely arranged, the openings are opposite, and a magnetic circuit space is formed around the end of the magnetic core; the permanent magnet is arranged in the magnetic circuit space, and the permanent magnet moves in the horizontal direction in the magnetic circuit space; and the at least two coils are wound on the at least two magnetic cores respectively.The application can realize higher energy density and efficiency, and the C-shaped structure of the magnetic core enables the magnetic core to be more compactly arranged, effectively utilizes the space, and thus reduces the overall size of the device.The application can also realize accurate control of the position of the permanent magnet by adjusting the magnetization state of the magnetic core.

The utility model belongs to the field of household manufacturing, especially relate to a rocking chair electromagnetic drive device and electric drive rocking chair, photoelectric rocking chair electromagnetic drive device, it includes bottom plate, is equipped with the reel coil on the bottom plate, is equipped with the support assembly with the coaxial reel coil on the bottom plate of reel coil side, support assembly includes support casing, is equipped with support hole on support casing, still include a drive core stick, drive core stick inserts cooperation in support hole and extends into reel coil, be equipped with scale mark on drive core stick, the window is set up in support casing, the surface of support casing on both sides of window is equipped with fixed column, still include photoelectric switch connected on fixed column, photoelectric switch be used for identifying scale mark, the utility model designs a kind of detection accurate, low-cost photoelectric rocking chair electromagnetic drive device, and the electric drive rocking chair with the electromagnetic drive device.

This invention provides a magnetically controlled microrobot system and its usage method, relating to the interdisciplinary field of ophthalmic medical devices and magnetically controlled robots. The magnetically controlled microrobot system includes an electromagnetic drive device, a magnetic microrobot, and a control device. The electromagnetic drive device includes a first electromagnetic array and a second electromagnetic array whose magnetic field directions are at an angle. The first and second electromagnetic arrays together form a driving magnetic field that can be controlled in multiple dimensions. The magnetic microrobot includes a magnetic body for responding to the driving magnetic field to perform multi-degree-of-freedom motion and / or posture adjustment. The control device is communicatively connected to the magnetic electromagnetic drive device and is used to control the electromagnetic drive device to generate a target magnetic field to drive the magnetic microrobot to perform the target operation. When used to treat rhegmatogenous retinal detachment, this magnetically controlled microrobot system enables controllable, multi-degree-of-freedom, and precise control of the magnetic microrobot within the limited space inside the eye.

This invention discloses a non-contact force-vibration coupled loading material fatigue testing device and method, belonging to the field of material fatigue testing technology. It includes a support frame with a horizontal adjustment component mounted on it, and further includes: a first loading component mounted on the adjustment end of the adjustment component, comprising an electromagnetic drive power supply, an annular bearing disk, and several electromagnet components. The annular bearing disk is mounted on the adjustment end of the adjustment component, and the several electromagnet components are arranged in a circular array on one side of the annular bearing disk, with each electromagnet component sliding along the diameter of the annular bearing disk; and a second loading component, configured as a vibration fatigue machine mounted on the top surface of the support frame. The top of the vibration fatigue machine holds the workpiece to be tested via a clamping component, and the workpiece to be tested coincides with the axis of the annular bearing disk. Through testing, this invention effectively solves the technical problem of traditional vibration fatigue testing's inability to couple external loads, achieving accurate loading and performance testing of the specimen under highly simulated working conditions.

The application discloses a high-low voltage isolation structure of a direct-current contactor and particularly relates to the technical field of high-voltage electrical equipment. The structure comprises a shell, a center movable contact rod, a partition type insulation baffle, a high-low voltage isolation assembly and an airflow guiding assembly. The partition type insulation baffle divides the shell into a high-voltage arc-extinguishing chamber in the upper part and a low-voltage control chamber in the lower part, thereby realizing physical space isolation. The high-voltage arc-extinguishing chamber is provided with an electric resistance assembly composed of an electromagnetic arc-extinguishing ring and a stepped labyrinth insulation sealing sleeve, and the electric resistance assembly effectively prevents high-voltage arc from flashover to the low-voltage side by prolonging and zigzagging the creepage path. The airflow guiding assembly comprises an airflow guiding baffle arranged at the top of the partition type insulation baffle and capable of guiding the high-temperature and high-pressure gas generated in arc extinguishing to be discharged upwards, thereby avoiding the direct impact of the high-temperature and high-pressure gas on the electromagnetic drive coil in the low-voltage chamber and avoiding the pollution of the electromagnetic drive coil. The application further provides a detachable self-cleaning scraping type insulation ring which can automatically scrape off the carbide on the surface of the center movable contact rod when the center movable contact rod moves up and down, thereby improving long-term insulation reliability.

This application discloses a suspended shaftless cooling fan, comprising: suspended blades, each including a suspension cylinder and blades; a fan frame, the fan frame having an annular groove, and a magnetic levitation positioning magnet assembly and a magnetic levitation drive assembly disposed between the annular groove and the outer wall of the suspension cylinder; the magnetic levitation drive assembly including a rotor magnet ring and an electromagnetic drive coil winding; the magnetic levitation positioning magnet assembly including a first positioning magnet, a second positioning magnet, a first positioning winding, and a second positioning winding. This application also discloses a control method. This invention belongs to the field of electrical engineering and heat dissipation equipment technology. Besides addressing the friction loss, efficiency reduction, heat generation, and wear problems caused by mechanical contact, it significantly improves the product's service life, operating efficiency, and reliability. By using multiple sets of distance sensors to monitor the rotor position in real time, it ensures that the fan always starts from the optimal position, avoiding vibration caused by eccentric starting.

The utility model discloses a high stability proportional solenoid valve belongs to solenoid valve technical field, including valve body module, electromagnetic drive module, heat compensation module and dynamic voltage stabilizing module, the valve body module includes valve body, the valve sleeve valve core of pressure equipment in valve body front end hole to and is connected in valve body rear end face rear end cover, the electromagnetic drive module includes the magnetic conducting sleeve, the coil assembly of installation in the magnetic conducting sleeve to and drive valve core's push rod, the magnetic conducting sleeve front end is pressed into valve body middle hole, and the rear end is fixed through the flange bolt, the compensation ring of heat compensation module is in the excess of the magnetic conducting sleeve outer wall, the dynamic voltage stabilizing module includes the voltage stabilizing piston of being located in the blind hole of valve core tail part, the voltage stabilizing spring of top pressure piston to and the adjusting screw of adjusting spring pre -tightness. The present application offsets the thermal deformation of the magnetic conducting sleeve through the heat compensation module, and the dynamic voltage stabilizing module continuously absorbs the fluctuation of oil back pressure to make the output flow smooth and non-pulsating, and keeps the high stability of proportional control.

This invention discloses a detonation device, including a housing, a detonation mechanism located in a cavity inside the housing, and an electromagnetic drive mechanism. The detonation mechanism includes an electrically controlled ignition unit, a detonator, and a detonating charge. The electrically controlled ignition unit is used to detonate the detonator, and the detonator is used to detonate the detonating charge. The electrically controlled ignition unit and the detonating charge are fixed at a relative interval at the bottom of the cavity, forming a receiving space for accommodating the detonator. The electromagnetic drive mechanism is used to drive the detonator to slide back and forth into or out of the receiving space, so that the detonator, the electrically controlled ignition unit, and the detonating charge are in an aligned or misaligned state. By controlling the electromagnetic drive mechanism to drive the detonator to slide back and forth, the switching and locking between the safe state and the detonation state can be realized, which has high reliability and ensures the safety of blasting operations.

A coolant switching solenoid valve includes a valve seat, a valve body, a valve core, a first spring, and an electromagnetic drive assembly. The valve seat has an inlet port, an outlet port, a valve port, and a corresponding flow channel. The valve core is movably mounted in the valve body. The first spring provides a normally closed sealing force for the valve core. The electromagnetic drive assembly can drive the valve core to open the flow channel. An installation groove is formed at the end of the valve core, and a second spring and a sealing block are housed within the groove, forming a two-stage sealing pre-tightening structure. The outlet flow channel is coaxial with the valve port. The inlet flow channel is an inclined horseshoe-shaped structure surrounding the outlet flow channel, and a conical boss is provided at the inlet end of the outlet flow channel. The electromagnetic drive assembly consists of a fixed iron core, a C-shaped yoke frame, a coil, and a guide sleeve. This design improves sealing reliability through a double-spring seal, reduces movement impact through a buffer structure, optimizes the flow channel to reduce flow resistance, and features a compact overall structure, convenient assembly, and effectively extends service life. It is suitable for coolant circuit on / off control.

The utility model relates to the field of vehicle wheel design and manufacturing technology, the utility model discloses a novel ring type shaftless wheel, including inner ring stator, the inner ring stator is annular columnar structure, is used for fixedly connected in the vehicle body, and the outer wall is provided with excitation coil along the circumference, outer ring rotor, the annular structure of the outer ring rotor is set up in the outer side of inner ring stator, and the inner wall is provided with permanent magnet along the circumference, permanent magnet and excitation coil concentric opposite and gap cooperation, form electromagnetic drive pair, tire main part, be located in the outer wall of outer ring rotor, this novel ring type shaftless wheel adopts the shaftless design of inner ring stator fixed, outer ring rotor rotation, is different from the traditional motor vehicle wheel and needs through the axle support, external power drive and rotation, cancels center axle and wheel hub completely, makes the hollow region of wheel center form through, adapts to the scene that needs large diameter wheel and needs to utilize the central space, solved the structural limitation of traditional shafted wheel center space unable to utilize.

This utility model provides a rodless OCV valve, including a valve body, a return spring, a valve core, a reversing rod, and an electromagnetic drive device. The upper end of the electromagnetic drive device is fixedly connected to the lower end of the valve body. A first sliding cavity is provided at the upper end of the electromagnetic drive device, and the valve core is slidably disposed in the first sliding cavity. The return spring and the reversing rod are arranged sequentially from top to bottom in the valve body. The reversing rod slides and engages with the valve body. The upper end of the return spring abuts against the inner wall of the valve body, and the lower end abuts against the reversing rod. The electromagnetic drive device is used to drive the valve core to move toward the valve body when energized. The characteristic feature is that the lower end of the reversing rod extends downward and abuts against the upper end of the valve core. The lower end of the valve body has a limiting part for preventing the valve core from moving further upward after it has moved an upward distance by a preset distance. This utility model simplifies the traditional rod structure, and the structural design is more reasonable.

This invention discloses an electromagnetic drive system for a switching device and a switching device having the same. The electromagnetic drive system includes: a guide member having a guide hole; and a movable component movable relative to the guide member along a first direction. The movable component has a moving contact mounting portion and a guide portion, the guide portion being movably fitted into the guide hole along the first direction. The guide portion has a non-circular cross-section perpendicular to the first direction, and the guide hole is adapted to the shape of the guide portion. According to the electromagnetic drive system of this invention, the movable component can move linearly along the first direction without rotation, thereby improving the straightness and alignment of the movable component throughout its stroke. This ensures accurate displacement of the moving contact, enabling reliable circuit closing or opening operations. Simultaneously, it reduces the use of limiting devices, simplifying the structure of the movable component and reducing the overall production cost of the electromagnetic drive system.

This utility model discloses an intelligent door magnetic controller. An AC-DC isolated flyback switching power supply module provides the power required for the normal operation of other modules. A DC-DC step-down power supply module connects to the 12V DC power output from the flyback switching power supply module, and outputs 5V power after BUCK conversion. An electromagnetic drive module connects to a WiFi main control module, controlling the opening and closing of the door by switching the power supply of the magnetic lock on or off. A door status detection module detects that when the door is closed, the photoelectric signal from the emitter of the reflective photoelectric switch is reflected by the door and transmitted to the receiver, causing the signal output from the door status detection module to the WiFi main control module to change from high to low. When the door is open, the receiver of the reflective photoelectric switch cannot receive the photoelectric signal from the emitter, and the output signal remains high. The WiFi main control module, as the core of the entire controller, collects the status of the door switch and photoelectric switch in real time, and also acts as a network module to interact with the server via WiFi.

This invention belongs to the technical field of drilling equipment, and particularly relates to a blasting drilling device for tunnel blasting construction. It includes: a vehicle body, on which are mounted an angle adjustment mechanism, a bag filter dust collection mechanism, a control mechanism, and a seat. The movable end of the angle adjustment mechanism is connected to an electric slide and a drilling mechanism. Each mechanism is connected to the control mechanism, and the drilling mechanism is connected to the bag filter dust collection mechanism. The drilling mechanism includes a drill cylinder, which is equipped with a drive unit, a fixed drill bit at the front end, and a tail end connected to the bag filter dust collection mechanism via a connecting part. Inside the drill cylinder, from the drill bit to the connecting part, are sequentially arranged a crushing part, a grinding part, and a dust collection part. This invention employs dry dust removal, eliminating the need for a water source. The angle adjustment mechanism enables multi-angle drilling, electromagnetic drive ensures drilling stability, and the coordinated operation of each mechanism improves the device's applicability and drilling efficiency, reduces dust pollution, and meets the drilling requirements for tunnel blasting construction.

The application discloses a brake with a gap adjusting function and a brake method, and belongs to the technical field of brakes, wherein the brake comprises a base, a moving box, a brake disc, an electromagnetic driving assembly and an adjusting structure; the moving box is installed on one side of the base and movably connected with the base; the electromagnetic driving assembly is installed on the moving box; the moving box is provided with a first brake pad; the electromagnetic driving assembly is provided with a second brake pad; the first brake pad is arranged on one side of the brake disc; and the second brake pad is arranged on the other side of the brake disc; the adjusting structure comprises an eccentric wheel, an adjusting piece and a reset elastic piece; the eccentric wheel is rotatably installed on the adjusting piece; the adjusting piece is installed on the moving box and slidably connected with the moving box; the reset elastic piece is arranged between the adjusting piece and the moving box and abuts against the adjusting piece and the moving box respectively; and the eccentric wheel is used for rolling cooperation with the brake disc. Rolling friction reduces the abrasion amount of the eccentric wheel and reduces the subsequent maintenance and repair cost of the brake.