752 results about "Electromagnetic coil" patented technology

The invention relates to the technical field of steel strip cutting and slitting, in particular to cold-rolled steel strip slitting equipment which comprises a cutting mechanism, the cutting mechanism comprises a cutting knife used for cutting a steel strip, a first iron core is arranged on the side wall of the cutting knife in a sliding mode, and a first electromagnetic coil making contact with the first iron core is arranged on the outer gap of the first iron core in a sleeving mode; and the bottom end of the cutting knife is fixedly connected with a second iron core. After a steel belt is placed on the top of the cutting table, the steel belt can push a rotating wheel and a rolling frame to synchronously move upwards, the telescopic end of a first elastic telescopic rod drives a first conducting strip to slide on a first resistance plate, the current of a first sliding rheostat is detected through a current detection module in a PLC, and therefore the thickness of the steel belt is fed back; according to the thickness of the steel belt, the PLC controls current introduced into the first electromagnetic coil and the second electromagnetic coil, so that the cutting knife generates proper frequency to perform high-frequency vibration up and down and left and right.

A high-frequency power multi-mode electric toothbrush comprises a body shell, a shimmy motor, a battery, a rotary brush rod and a shimmy brush rod, the body shell is hollow to form a built-in space, and the rear end of the body shell is closed through a detachable tail cover; a control circuit board is contained in the body shell, a plurality of function buttons connected to the control circuit board are arranged on the side wall of the body shell, a battery is arranged at the rear end of the built-in space and electrically connected to the control circuit board and the shimmy motor, and the shimmy motor is arranged at the front end of the built-in space of the body shell and electrically connected to the control circuit board and the shimmy motor. An output shaft of the shimmy motor extends out of the front end of the body shell and is connected to the body shell to provide power output, and the shimmy motor comprises a motor support, an electromagnetic coil, a vibration arm assembly, a front cover and a magnet; therefore, two modes of the high-frequency rotary brush rod and the high-frequency swing brush rod are effectively considered, the rotation or swing frequency is effectively improved, and the problems of noise and service life of the brush rod under high-frequency work are solved by adopting flexible compensation.

The invention relates to the technical field of tension control in the material processing process. The electromagnetic coil winding tension control method comprises the steps that real-time state information is input into a wire rod type recognition model to obtain wire rod type information, and a corresponding tension adjusting model is called from a tension control model library based on the wire rod type information to adjust the winding tension of the electromagnetic coil. And inputting the real-time state information into the tension adjustment model to obtain tension adjustment parameter information, comparing the tension adjustment parameter information with preset tension safety boundary information to generate limited adjustment instruction information, executing tension adjustment operation according to the limited adjustment instruction information to obtain feedback tension information, and sending the feedback tension information to the server. The feedback tension information and the limited adjustment instruction information are compared and analyzed, a real-time tension adjustment result is obtained, and if the real-time tension adjustment result meets the target tension range, the current tension adjustment state is kept. The wire winding device has the effect of achieving accurate adjustment of the wire in the winding stage.

An electric motor system, such as for an electrified vehicle, includes a permanent magnet motor (PMM) including a hollow cylindrical stator defining a circular inner portion with a plurality of slots, defined between a respective plurality of ferromagnetic teeth, and having a plurality of electromagnetic coils arranged in the plurality of slots, respectively, and a cylindrical rotor disposed within the stator and defining a circular outer portion having N pairs of permanent magnets arranged thereabout to define N rotor poles, respectively, wherein at least one pair of the N pairs of permanent magnets is asymmetrically staggered or offset relative a symmetric N pole positioning, and wherein N is an even integer greater than or equal to four, and a controller configured to control the PMM to mitigate or eliminate magnetic cogging.

The invention discloses an osmometer for safety monitoring of a reservoir dam, which relates to the technical field of safety monitoring, and comprises an outer shell for providing a protection effect, a water seepage hole arranged at the end part of the outer shell, a diaphragm for detecting and judging water pressure, and an electromagnetic coil for detecting the vibration frequency of a steel wire connected with the diaphragm, and the tension adjusting mechanism is used for detecting and adjusting the tension of the steel string in real time so as to ensure the detection accuracy. According to the scheme, the tension adjusting mechanism is additionally arranged at the tail end of the steel string, the tension of the steel string can be detected in real time, when the tension of the steel string is externally influenced or changes, the tension of the steel string can be adjusted in real time, the stability of the steel string in the later use process is guaranteed, and the service life of the steel string is prolonged. Secondly, in consideration of the basic principle when the steel string is used for detection, fixation and movement of the tail end need to be considered, real-time adjustment and fixation of the steel string are synchronously guaranteed according to actual requirements, and therefore it is guaranteed that the steel string can work correctly.

The invention relates to the technical field of liquid metal driving equipment, in particular to an annular channel induction type lead-bismuth electromagnetic pump. The lead-bismuth electromagnetic pump comprises an internal stator, an annular flow channel, an external stator, an electromagnetic coil and an electromagnetic pump shell; the outer wall of the annular runner is coated with a protective layer; the protective layer is made of nanometer flexible heat preservation cotton, the thickness of the protective layer ranges from 5 mm to 10 mm, and the protective layer is configured to enable the surface temperature of the protective layer to be controlled to be 100 DEG C or below. Compared with an existing annular channel induction type lead-bismuth electromagnetic pump, the annular channel induction type lead-bismuth electromagnetic pump has the advantages that the nanometer flexible heat preservation cotton with the better heat insulation performance is mainly adopted as the main material of the protection layer, the heat insulation performance of the protection layer is improved by designing the thickness of the protection layer, and the operation temperature range of the annular channel induction type lead-bismuth electromagnetic pump is widened; the problems that an existing annular channel induction type electromagnetic pump is low in running temperature, consequently, running conditions are limited, and efficiency is low are solved.

The invention relates to the technical field of metal die-casting forming, and discloses a vacuum die-casting method for a high-reliability aluminum alloy motor end cover, which comprises the following steps: carrying out acoustic levitation purification treatment on an aluminum alloy melt; detecting the acoustic purity of the purified melt on line by adopting an acoustic characteristic sensing device; feeding the melt into a mold cavity for vacuum die-casting filling; and according to the detection result of the acoustic purity, an electromagnetic coil preset at the hot spot area of the mold is controlled in a feedforward mode, and magnetic field induction partition solidification of the hot spot area is achieved. According to the method, through the synergistic effect of melt purification and solidification control, micro bubbles and inclusions in the melt are removed through acoustic levitation purification firstly, then accurate magnetic field induction partition solidification is conducted on a hot spot area through feedforward control based on melt quality real-time data, formation of microscopic and macroscopic defects is effectively inhibited, and the quality of the melt is improved. The manufactured motor end cover is high in internal density and good in mechanical property and air tightness, and the product reliability is remarkably improved.

The system and method for decelerating space objects moving at high velocities are provided. The system comprises at least one closed volume containing a combination of gas, liquid, solid particles, or a mixture thereof. The volume can be transported to the targeted location using a range of means, including a chemical gun, light gas gun, electromagnetic coil gun, superconducting quench gun, a rocket, or a combination thereof. The volume is strategically positioned on the trajectory of the moving object. Upon penetrating the walls of the volume, the object passes through it, experiencing deceleration.

The invention discloses a carbon fiber cushion mold positioning and forming device, and relates to the technical field of composite material manufacturing, and a magnetorheological fluid positioning assembly is characterized in that firstly, magnetorheological fluid filled in an annular gap area between a stainless steel cavity and four ceramic pipe sleeves is in a liquid floating state in a pre-mold-closing stage; at the moment, the ceramic pipe sleeve does not exert any rigid constraint, so that the prepreg is allowed to be adjusted within a tiny range due to laying deviation, extrusion friction between the prepreg and the mold is eliminated through flexible adjustment of the magnetorheological fluid, the risk of fiber wrinkles or local breakage is reduced fundamentally, and along with advancing of the mold closing action of the mold, the production efficiency of the prepreg is improved. The ceramic pipe sleeve makes contact with the mold structure, contact force can be transmitted to the first pressure sensor at the top of the ceramic pipe sleeve through the ceramic pipe sleeve, and when the first pressure sensor is used for detecting and promoting a system to judge that the trigger condition of mold closing and locking is met, then the magnetorheological fluid is solidified through a magnetic field generated by the electromagnetic coil; and the ceramic pipe sleeve is in a rigid locking state.

The invention relates to the field of electrical equipment monitoring, in particular to an intelligent online monitoring method and system for a high-voltage vacuum circuit breaker, and the method comprises the steps: receiving a circuit breaker control signal, and carrying out the electromagnetic pushing operation of a moving contact transmission rod through a started electromagnetic coil, thereby obtaining a motion transmission rod; monitoring the motion transmission rod based on a preset monitoring frequency and a displacement sensor, performing speed analysis on a displacement time sequence to obtain a displacement fluctuation index and an average displacement speed, calculating a displacement failure rate according to the displacement fluctuation index and the average displacement speed, and if the displacement failure rate is smaller than or equal to a displacement failure threshold value, determining that the motion transmission rod does not have the displacement failure. If yes, a piezoelectric sensor, an ionization sensor and a thermal conductivity sensor are used for executing vacuum inspection operation on the vacuum arc extinguish chamber, an arc extinguish vacuum index is obtained, and when the circuit breaker monitoring platform receives a safety signal or an early warning signal, online monitoring of the high-voltage vacuum circuit breaker is completed. The real-time performance and the accuracy of monitoring the high-voltage vacuum circuit breaker can be improved.

The electromagnetic valve comprises a valve shell, a valve seat, an electromagnetic coil, a valve element, a static iron core and a movable iron core, the valve element, the static iron core and the movable iron core are connected into the valve shell, and an elastic piece is connected between the movable iron core and the static iron core; the buffering assembly comprises a first buffering piece and a second buffering piece, and the first buffering piece is connected to the end, close to the static iron core, of the movable iron core and outwards extends out of the end face of the movable iron core in the axial direction. The second buffer piece is connected to one end, close to the movable iron core, of the static iron core and extends out of the end face of the static iron core in the axial direction; the projection of the first buffering piece in the axial direction of the valve shell and the projection of the second buffering piece in the axial direction of the valve shell do not coincide, and when the electromagnetic coil is electrified to enable the movable iron core to move in the direction close to the static iron core, the first buffering piece abuts against the static iron core, and the second buffering piece abuts against the movable iron core. According to the electromagnetic valve, hard impact between the movable iron core and the static iron core due to inclination can be effectively prevented, the impact strength between the movable iron core and the static iron core can be effectively reduced, and the mute effect is good.

The utility model belongs to the technical field of magnetic separators, and particularly relates to an electromagnetic separator with a heat dissipation coil, which comprises a frame, a conveying mechanism mounted on the frame, a transmission mechanism connected with the conveying mechanism, and a magnetic separation mechanism mounted on the frame. The magnetic separation mechanism comprises a shell, a winding reel is mounted in the shell, the winding reel is connected with a mounting frame, and a mounting ring is mounted on the mounting frame; each installation ring is provided with a plurality of winding supporting rods, electromagnetic wires are wound around the outer sides of the winding supporting rods of the installation rings, the electromagnetic wires sequentially wind around the winding supporting rods of the installation rings from inside to outside along the centermost installation ring, and a heat dissipation gap is reserved between every two electromagnetic wire layers. By arranging the mounting ring and the winding supporting rod, a plurality of gaps are reserved between the electromagnetic coils, heat dissipation of the electromagnetic coils is facilitated, the ventilation holes, the draught fan, the coil pipe, the oil cooler and the temperature sensor are additionally arranged, the temperature in the magnetic separation mechanism can be detected and adjusted in real time, and normal operation of the device is guaranteed.

To obtain a brake device 8 and a buffer member 100 that allow a buffer part 110 to be easily replaced, and allow the generation of a contact sound to be restrained when a field 10 and an armature 20 come into contact with each other.SOLUTION: A brake device 8 comprises a field 10, an electromagnetic coil 80, an armature 20, a biasing part 70, and a buffer member 100. The field 10 comprises a first surface 11 and a second surface 12. A hole 16 penetrating to the second surface 12 from the first surface 11 is formed. The buffer member 100 is formed so as to be insertable into the hole 16 toward the first surface 11 from the second surface 12. A buffer part 110 is arranged at one end. The buffer member is arranged in the hole 16 so that when the armature 20 approaches the first surface 11, the armature 20 comes into contact with the buffer part 110.SELECTED DRAWING: Figure 3

The utility model discloses an electromagnetic valve structure, which relates to the technical field of electromagnetic valves, and comprises a valve body, a valve cover assembly, an electromagnetic coil, a heat dissipation assembly, a sealing plate, a valve core, a spring, a movable iron core and a fixed iron core, the valve cover assembly is fixed on the upper part of the valve body through a bolt, the electromagnetic coil is arranged in the valve cover assembly, the heat dissipation assembly is arranged on the side wall of the valve cover assembly, and the sealing plate is arranged on the valve cover assembly. The heat dissipation assembly comprises a fixing ring, a heat conduction plate and a heat dissipation ring, heat generated by the electromagnetic coil is transferred to the outside of the valve deck assembly, external gas takes away heat on the heat dissipation assembly, the sealing plate is fixed to the upper portion of the valve deck assembly through bolts, and the valve deck assembly and the sealing plate fix the heat dissipation assembly. The heat generated by the electromagnetic coil is quickly and effectively conducted to the outside of the valve cover assembly. The heat conduction plate ensures that heat is uniformly distributed in the assembly, the plurality of groups of horizontally arranged heat dissipation rings increase the heat dissipation area, and the heat dissipation efficiency is further improved by utilizing the natural flow of external gas.

The invention provides a torque optimization type flat axial magnetic flux motor which comprises a main body assembly, and the main body assembly comprises two stator iron cores, an electromagnetic ring, a mounting frame, an electromagnetic coil, a rotor disc, a mounting seat, two limiting blocks, two fixing plates, two upper magnetic blocks, two limiting grooves, two limiting rods, a supporting spring and a through groove. And the through grooves are symmetrically formed in the rotor disc. When the robot needs to bear a large load, the electromagnetic ring pushes the sliding block through the lower magnetic block, the sliding block drives the clamping blocks, the two clamping blocks get close to each other, then the electromagnetic ring works, the upper magnetic block is pushed through magnetic force to move in the direction away from the mounting frame, meanwhile, the mounting base drives the magnetic steel, and due to the fact that the mounting base generates displacement, the magnetic steel is driven to rotate. And the torque of the axial magnetic flux motor is in direct proportion to the cube of the radius of the rotor, so that the torque can be remarkably improved by increasing the radius of the rotor, the motor is further suitable for a scene with a relatively large load, and the motion performance of the robot is ensured.

An axial active magnetic bearing includes a rotating shaft, a magnetic yoke, a permanent magnet, a magnetic barrier structure and an electromagnetic coil. The rotating shaft includes a main shaft and a thrust plate; first and second air gaps with a projected area size having an error smaller than 5% are formed between the magnetic yoke and the thrust plate; the permanent magnet is provided on the magnetic yoke, and a third air gap is formed between the thrust plate and the permanent magnet; a permanent magnet magnetic flux is formed between the permanent magnet and the magnetic yoke; the magnetic barrier structure is provided on the magnetic yoke and positioned in the path of the permanent magnet magnetic flux, the permanent magnet magnetic flux is passed through the barrier structure, the first air gap and the third air gap; the electromagnetic coil is provided in a magnetic yoke chamber.

The invention relates to the technical field of flywheel energy storage equipment, in particular to a flywheel rotor dynamic balance self-adaptive adjusting method and system based on magnetorheological fluid. The method comprises the steps that the sealing state of a magnetorheological fluid cavity is detected through a pressure sensor, and it is ensured that the pressure in the cavity is stable and free of leakage; the non-contact displacement sensor executes zero calibration, and output signal fluctuation is controlled within a preset range; carrying out no-load test on a current output port of the self-adaptive control module; when the rotating speed rises from a static state to a preset rotating speed value, a sensor of the real-time monitoring module synchronously collects a radial vibration signal of the rotor, decomposes a fundamental frequency vibration component with the same frequency as the rotating speed, and calculates the amplitude and the phase of the unbalance; when the rotating speed is stabilized in a preset rotating speed interval, the self-adaptive control module enters a closed-loop adjusting state, and when an unbalanced phase is calculated according to detection, a corresponding compensation quadrant fan-shaped cavity is locked, and the current of an electromagnetic coil is adjusted; the problem of traditional adjustment lag is solved, and over-compensation and under-compensation under variable working conditions are avoided.

The invention discloses a node structure electric arc fuse wire additive manufacturing method, and belongs to the technical field of electric arc additive manufacturing. According to the method, the problems that in the prior art, due to uneven heat distribution, the joint binding force is insufficient, the machining allowance is low, and the welding gun collision risk is caused by too high material accumulation in a joint area are solved; the method comprises the steps that a welding gun deposits a first welding bead along an arcing point, when a second cross welding bead is deposited, a coaxial electromagnetic coil is arranged outside the welding gun, an external alternating magnetic field is generated to act on an electric arc, the electric arc and a molten pool oscillate periodically, and therefore the metal fluidity of the molten pool is enhanced; by applying the external alternating magnetic field, non-contact stirring of the molten pool can be achieved, an additional mechanical movement device is not needed, the molten pool has the advantages of being safe and clean, the fluidity of the molten pool subjected to magnetic arc oscillation stirring is higher, and the problems that materials at nodes excessively accumulate and protrude, and joints of the nodes are heated unevenly and shrink are solved.

The invention discloses a multistage electromagnetic coil transmitter energy recovery circuit and an electromagnetic coil transmitter. The multistage electromagnetic coil transmitter energy recovery circuit comprises first to eleventh diodes, first to third capacitors, first to third coils, first to eighth transistors, and first to third switches. According to the invention, coil energy is recovered to each level of capacitor by controlling the conduction time sequence of each transistor, and after the discharge of the previous level of coil is completed and the energy is recovered to the previous level of capacitor, the energy recovered in the capacitor can be released to the next level of coil when the next level of coil is triggered. The current in the coil can be quickly returned to zero, energy is recycled and acts on the next-stage coil, coil heating and the coil dragging force effect are reduced, and the outlet speed and efficiency of the electromagnetic coil emitter are improved.

This invention discloses a magnetorheological vibration isolator with negative stiffness characteristics, comprising a magnetorheological elastomer (MRE), an iron sheet, a circular magnet, a cylindrical central shaft, an electromagnetic coil, upper and lower base plates, an outer sleeve, and a bar magnet. The MRE, iron sheet, and circular magnet form a multi-layered MRE structure, with the circular magnet providing a portion of the initial magnetic field to the MRE. The electromagnetic coil, located between the multi-layered MRE structure and the outer sleeve, can control the magnetic field strength acting on the MRE in real time, thereby controlling the stiffness and damping of the MRE isolator. The bar magnet and magnet brackets form a negative stiffness generating unit, respectively installed on both symmetrical sides of the isolator. This invention introduces negative stiffness characteristics into a semi-active vibration isolator, improving the vibration reduction effect of semi-active control to the level of active control, while also offering good stability and low system cost. This invention can be applied to lateral vibration control in high-speed trains, improving stability and safety during high-speed operation, and has broad application prospects.

The utility model belongs to the technical field of ore sorting, and particularly relates to a belt conveyor which comprises a conveyor belt and an iron removal device arranged at the upper end of the conveyor belt, the iron removal device comprises rotating shafts, a belt and an electromagnetic coil, the belt is arranged on the outer sides of at least two rotating shafts, and the electromagnetic coil is arranged in the belt. A rotating shaft is arranged below the iron removal device, a protruding block is arranged at one end of the rotating shaft, a driving piece is arranged at the other end of the rotating shaft, a connecting base is arranged on the protruding block, a lifting piece I is arranged below the connecting base, a supporting assembly is arranged on the driving piece, and a lifting piece II is arranged below the supporting assembly. When the weak magnetic metal is detected, the height of the iron removal device can be adjusted, so that the iron removal device is closer to the conveying belt, and the weak magnetic metal is separated out.

The invention provides a microgravity metal fuse wire additive melt directional transfer and liquid bridge transition maintaining device and method. A forming substrate is installed on a multi-axis motion platform; the multi-axis motion platform customizes a three-dimensional motion track path according to three-dimensional data in additive manufacturing; the two current clamps are respectively fixed between the metal wire and the forming substrate, a current path is formed between the metal wire and the forming substrate through a direct-current power supply, and an ampere meter is connected in series in the current path; the electromagnetic coil is arranged in the circumferential direction of the metal wire, and the magnetic conductive bars are connected with the electromagnetic coil and distributed at the symmetrical positions of the two sides of the end of the metal wire. The AC power supply provides an alternating electric field for the electromagnetic coil; the wire feeding mechanism and the driving motor feed the metal wire to the action range of the light spot emitted by the laser source quantitatively at a constant speed; the laser acts on the forming substrate, and a liquid molten pool is formed on the forming substrate; the metal wire and the forming substrate form a liquid bridge connection mode through the liquid melt. The air hole defect of the component can be reduced.

The invention discloses a high-temperature-resistant electromagnetic coil for a control rod driving mechanism of a nuclear power station, which comprises a shell internally provided with a high-temperature electromagnetic coil, a lead end of the high-temperature electromagnetic coil upwards penetrates out of the shell, an electrical penetration piece is arranged at the joint of the lead end and the shell, the electrical penetration piece is arranged on the upper end surface of the shell, and the high-temperature-resistant electromagnetic coil is arranged in the shell. The lead wire end upwards penetrates out of the electrical penetration piece; the outer side of the electrical penetration piece is sleeved with an insulating cloth sleeve, the lower end of the insulating cloth sleeve is arranged on the outer side of the electrical penetration piece in a sleeving mode, and the upper end of the insulating cloth sleeve is arranged on the outer side of the lead wire end in a sleeving mode. Through the collaborative design of the shell, the electrical penetration assembly and the insulating cloth sleeve, the problems of difficult maintenance and poor heat dissipation of a traditional resin encapsulation process are solved, the dustproof, insulating and high-temperature-resistant performances are considered at the same time, and a more efficient and reliable high-temperature electromagnetic coil solution is provided for a control rod driving mechanism of a nuclear power station.

The utility model discloses an electromagnetic coil winding device, which belongs to the technical field of winding equipment and comprises a fixed table and a movable frame, a tensioning and positioning mechanism is arranged on the rear side of the top of the fixed table, clamping mechanisms are arranged on two sides of the movable frame, each clamping mechanism comprises a mounting plate, a driving ring, an air cylinder, a connecting ring and a plurality of clamping plates, l-shaped plates are fixedly installed on the sides, away from each other, of the multiple clamping plates, inclined rods are fixedly installed at the other ends of the L-shaped plates, a plurality of inclined holes are formed in one side of the connecting ring, the inclined rods are slidably installed in the corresponding inclined holes, an annular rail is fixedly installed on one side of the connecting ring, and the annular rail is fixedly installed on the other side of the connecting ring. And a plurality of connecting rods are fixedly mounted on one side of the driving ring. The two ends of the coil framework can be clamped and fixed in multiple directions through the two clamping mechanisms, the clamping and fixing stability is guaranteed, the coil framework is prevented from inclining in the winding process, and the winding uniformity is guaranteed.

The application provides a one-time forming electron beam welding method for a titanium alloy component with single-sided incidence and double-layer welds, which comprises the following steps: a closed cavity structure titanium alloy component is formed by a plurality of mutually shielded multi-layer thin plates through single-direction electron beam incidence; the focusing current of the electron beam is adjusted; the converging effect of the electromagnetic coil is changed to change the focus position, and then the electron beam keyhole depth and size are changed; the keyhole is adjusted to be an energy channel through which the electron beam passes; the electron beam energy can pass through the first layer of welds to reach the second layer of welds; the controllable linear energy is provided by combining the acceleration voltage, the welding current and the welding speed to ensure that the remaining energy that penetrates reaches the second layer of welds to complete the welding of the second layer of welds again; the low-frequency scanning is combined with the electron beam movement to drive the first layer of molten pool metal to flow and fill the rear channel, and the front channel is opened, so that the channel is dynamically smooth and stable, and the electron beam keyhole effect behavior is adjusted.

A method of detecting presence or absence of a magnetic measurement probe at a measurement launch position in an electromagnetic coil of an ophthalmic instrument includes applying a temporary current pulse to the electromagnetic coil, detecting a counter-electromotive force voltage spike induced in the electromagnetic coil by the current pulse, evaluating a decay behavior of the counter-electromotive force voltage spike, and correlating the decay behavior of the counter-electromotive force voltage spike to presence or absence of the measurement probe at the measurement launch position.

The invention belongs to the technical field of offshore wind power, and particularly discloses a floating type fan foundation platform capable of absorbing wave flow energy, which comprises a middle buoy and a plurality of outer buoys annularly distributed on the peripheral side of the middle buoy, and the outer buoys are fixedly connected with the middle buoy through connecting beams; each buoy is movably connected with an energy absorption bracket, and the energy absorption bracket comprises a middle sleeve arranged on the middle buoy in a sleeving manner, an outer sleeve arranged on the outer buoy in a sleeving manner, and a supporting rib plate fixedly connected with the middle sleeve and the outer sleeve; an electromagnetic coil is sealed in the outer sleeve, a permanent magnet is fixed in the outer buoy, and the electromagnetic coil and the permanent magnet are matched to be used for converting reciprocating motion kinetic energy of the energy absorption support into electric energy; the energy-absorbing buoy sleeves the periphery of the middle buoy and is positioned at the bottom of the energy-absorbing bracket; and the energy-absorbing buoy is used for driving the energy-absorbing bracket to reciprocate along the axial direction of the middle buoy. The stability of the platform in a complex marine environment is remarkably improved, the influence of vortex-induced vibration and large-amplitude motion on the draught fan is reduced, wave and water flow energy can be recycled, and electric power is generated.

A magneto-rheological damper includes a cylinder including a magneto-rheological fluid with a viscosity that is changeable in accordance with magnetic field application, a piston movable in the cylinder and partitioning the cylinder into first and second compartments, a fluid passage enabling the first compartment and the second compartment to communicate with each other, and an electromagnet including an electromagnetic coil and an iron core pipe. A magnetic field is applicable to the fluid passage by energizing the electromagnetic coil to increase a flow resistance of the magneto-rheological fluid in the fluid passage so that movement resistance is applied to an object connected to the piston. The fluid passage includes: a first fluid passage facing one end portion of the iron core pipe and to which the magnetic field is applied by the electromagnetic coil, and a second fluid passage extending through the iron core pipe.

The invention discloses a carton board printing device, which relates to the technical field of package printing, and comprises a magneto-rheological dynamic impressing assembly, a self-calibration pressure sensing paper guide assembly and a bracket, and the magneto-rheological dynamic impressing assembly is arranged on one side of the outer wall of the bracket; according to the magnetorheological dynamic imprinting assembly, firstly, a laser triangulation range finder and an ultrasonic sensor are used for detecting tiny concave-convex and overall thickness difference of the surface of a paperboard in real time, a partitioned electromagnetic coil in an imprinting roller is driven, the magnetic field intensity is dynamically adjusted by means of the millisecond response characteristic of magnetorheological fluid so as to change the damping characteristic of the magnetorheological fluid in the imprinting roller, and then the paperboard surface is impressed. When the local part of the paperboard is detected to be thicker or bulged, the magnetic field of the electromagnetic coil in the corresponding subarea is weakened, and the magnetorheological fluid is in a low-viscosity state to avoid excessive pressure in the area, and when the local part of the paperboard is detected to be thinner or sunken, the magnetic field of the electromagnetic coil in the corresponding subarea is enhanced, and the magnetorheological fluid is in a high-hardness state to ensure sufficient pressure in the area; therefore, precise pressure compensation of the local area of the paperboard is achieved.

The invention discloses a water-rich broken surrounding rock directional grouting method based on an external magnetic field. The method comprises the following steps that 1, geological exploration is conducted on a target water-rich broken surrounding rock area; step 2, mixing the base material, the nano ferroferric oxide magnetic particles, the rheology regulating agent, the dispersing agent and the coagulation accelerator according to a mass ratio; 3, injecting alternating current with the frequency of 50-500Hz into the electromagnetic coil to generate a rotating magnetic field with the intensity of 3-10kA / m, and driving the slurry to directionally migrate along the main fracture area; 4, the grouting pressure of the pre-buried pressure sensor is monitored in real time, when the pressure change rate delta P / delta t is larger than or equal to 0.1 MPa / min, the electromagnetic coil injection frequency is switched to alternating current of 1 kHz to 10 kHz, so that the intensity of a magnetic field is improved to 8 kA / m to 15 kA / m, and grouting on the micro-crack area is enhanced; and 5, when the pressure change rate delta P / delta t is smaller than + / -0.1 MPa / min and lasts for 5-10 min, grouting operation is ended. The method aims at solving the problems that in grouting reinforcement of the water-rich fractured stratum, slurry is lost along with water flow, micro-cracks are difficult to fill, and reinforcement bodies are distributed unevenly.