73results about How to "Avoid resonance" patented technology

The invention provides a motor vibration noise control method and system based on modal resonance frequency prediction, and belongs to the field of motor control. The method comprises the following steps: acquiring each order of intrinsic mode frequency of the permanent magnet motor; a cost function parameter, a current constraint condition and a control target are set, and a model prediction control method is adopted to drive an inverter to operate, specifically, the current operation state quantity of the permanent magnet motor is collected; predicting a state response in a future finite time domain based on the operation state quantity; constructing a value function, and evaluating and optimizing a state change result; and selecting an optimal voltage vector, generating a pulse signal to drive an inverter to execute, obtaining a motor high-frequency electromagnetic force wave distribution condition, comparing the motor high-frequency electromagnetic force wave distribution condition with the intrinsic mode frequency of the permanent magnet motor, and optimizing an optimal voltage vector selection logic. The problems that harmonic waves are concentrated and resonance is easily caused by a fixed switching frequency modulation method in the prior art, and a passive suppression method is high in cost and poor in flexibility are solved.

This invention relates to the field of single-phase circuit fault location technology, specifically to a method and system for tracing single-phase circuit fault points. When measuring distributed capacitance, this application generates a rectangular oscillating wave, output to the capacitor under test, and uses an integrating circuit to measure the voltage value. The capacitance value is then confirmed based on the voltage value. Since distributed capacitance exists between conductors and its value is related to the conductor length, by measuring the distributed capacitance, the length of the conductor can be determined, i.e., the distance to the fault, thereby determining the fault location. This application can accurately locate fault points in wall-buried or underground circuits, reducing operating costs, and has the functions of accurately locating line fault points and testing the length of broken wires.

This application belongs to the field of semiconductor processing technology, specifically relating to a backlight reflective layer printing device and its application. This application effectively controls the vibration generated during the printing process by optimizing the mechanical structure and position design of the frame, support plate device, and multi-axis spindle, reducing the deviation between the actual operating path and the planned path of the piezoelectric jet valve. This significantly improves the stability of the piezoelectric jet valve operation and the printing accuracy. Furthermore, this application, by setting up a micro-adjustment device, a positioning system, an inkjet calibration system, and a needle alignment device, and utilizing their coordinated relationship, can precisely correct printing parameters such as the jetting position or jetting volume of the piezoelectric jet valve. Therefore, based on the aforementioned stable printer body structure, the coating quality of the backlight reflective layer obtained by piezoelectric jet printing will be further improved. Thus, the backlight reflective layer prepared using this invention has better thickness uniformity and a better reflective effect.

The present invention discloses a liftable rubber bearing with an air spring, belonging to the technical field of bridge shock absorption. It includes an upper pier and a lower pier arranged oppositely, and the upper pier and the lower pier are connected by support columns. The support columns include connecting cylinders, rubber bonding blocks and a number of air elastic columns. The connecting cylinder is provided with a number of uniformly distributed air elastic columns penetrating along its circumferential direction. The air elastic columns can extend or shorten along the axis direction of the support column, and the connecting cylinder is filled with the rubber bonding blocks. By arranging a number of air elastic columns that can expand and contract along the axis direction of the support column in the circumferential direction of the support column, using the elastic characteristics of the air elastic columns, as the vibration load of the rubber bearing increases, the bearing capacity of the rubber bearing increases, and the air elastic columns can suppress the vibration amplitude and avoid resonance. When the impact load increases, the stiffness also becomes larger, ensuring a good vibration isolation effect.

This application discloses a method for calculating the vibration isolation of ship vibration isolation devices based on isolator type spectrum data, relating to the field of ship vibration isolation design. The method includes: acquiring the type spectrum data and impedance test data of the target isolator; determining the stiffness and damping parameters of the target isolator based on the type spectrum data and impedance test data; constructing a finite element model of the ship vibration isolation device; inputting the stiffness and damping parameters of the target isolator into the finite element model for calculation, and obtaining the vibration isolation calculation results of the target isolator. This method can efficiently utilize isolator type spectrum data to conduct vibration isolation calculation and evaluation of ship vibration isolation devices during the ship design phase, avoiding resonance between the natural frequency of the vibration isolation device and the excitation frequency of the equipment, and improving the vibration isolation effect.

The invention provides a power assembly and a vehicle with the power assembly, the power assembly comprises an integrated shell and a stator rotating mechanism, the integrated shell is internally provided with a containing cavity, the containing cavity is internally provided with a motor shaft, a first motor unit and a second motor unit, the first motor unit and the second motor unit are both arranged on the motor shaft, and the stator rotating mechanism is arranged in the containing cavity. The first motor unit and the second motor unit are arranged in the axial direction of the motor shaft in a spaced mode. The stator rotating mechanism is connected with a stator of the second motor unit, and the stator rotating mechanism is rotatably arranged relative to the side wall of the containing cavity so as to adjust the stator angle of the second motor unit. By designing the stator rotating mechanism, the circumferential angle of the stator of the second motor unit is adjusted, and noise and resonance of the motor are reduced.

The application discloses a heat treatment device and method for photovoltaic module recycling, and belongs to the field of photovoltaic module recycling, and comprises a heat treatment room, a vibrating platform, a lifting mechanism, a clamping mechanism and a fixing seat. The photovoltaic module can be placed on the fixing seat, the heat treatment room can heat the area where the fixing seat is located, and the heating temperature of the heat treatment room can make the EVA adhesive film become a solid jelly-like film. The adsorption mechanism can adsorb the glass layer or the back plate of the photovoltaic module and drive the glass layer or the back plate to move upwards. The EVA adhesive film in the photovoltaic module is adjusted to a solid jelly-like film by low temperature, the vibrating platform causes intense relative movement between the back plate and the battery plate and between the battery plate and the glass layer, thereby breaking the EVA adhesive film in the middle, and the glass layer, the battery plate and the back plate are disassembled. After disassembly, the high-pressure blowing mechanism is used to remove the EVA adhesive film remaining on the glass layer, the battery plate and the back plate. In the whole process, the EVA adhesive film is not dissolved and harmful gas is not generated.

The invention relates to the technical field of feed trays, and discloses a novel feed tray detection device, which comprises an adjustable bracket used for mounting and supporting the detection device and avoiding a vibration source; the connecting support and the adjustable support are installed in a hinged mode, the connecting support is used for adjusting the detection angle of the detection device, a mounting plate is installed on one side of the connecting support, and the relative height of the mounting plate and the connecting support is adjustable; the pendulum component is arranged on the side surface of the mounting plate and is rotationally connected with the mounting plate; according to the invention, the problems of unstable material quantity and high alarm rate caused by similar colors and different heights of products in traditional optical fiber detection are comprehensively solved through a plurality of adjusting structures (the adjusting pipe has multiple gears, and the angle and height of the connecting bracket are adjustable) and different state designs (vertical / inclined / universal ball structures) of the pendulum component, and the production efficiency is effectively improved.

This utility model provides a low-noise vibration damper assembly, comprising a transmission disc connected to a wheel hub via a central hole and secured with rivets. Cover plate A and cover plate B are respectively provided on both sides of the transmission disc, with a fixing seat between them and a limiting block on the outer edge of the fixing seat. The transmission disc has a window containing a vibration damping spring, with fixing blocks at both ends of the spring. Multiple bosses are evenly distributed on the outer circumference of the transmission disc, with a rotating block between adjacent bosses. The fixing blocks, rotating blocks, and limiting blocks are all made of elastic material. This invention solves the technical problem of noise and reduced comfort caused by rigid contact between the transmission disc and elastic or limiting elements in existing vibration dampers. This utility model can be widely applied to vehicle transmission systems.

This utility model relates to the field of vibratory feeder technology and discloses a vibratory feeder for a flow regulator, including a base, a sliding frame slidably connected inside the base, a supporting shell fixedly connected to the top of the sliding frame, a sliding rod slidably connected inside the supporting shell, and a vibratory feeder fixedly connected to the top of the sliding rod. This utility model utilizes the linear displacement characteristics of the threaded rod to precisely control the position of the moving block, thereby flexibly adjusting the rotation radius of the connecting column. This design allows the vibration amplitude to be adjusted in real time according to material characteristics such as weight, surface friction coefficient, or flow requirements, enhancing the equipment's adaptability to different working conditions. The threaded connection structure avoids the risk of slippage or jamming of the moving block, while the meshing of the first bevel gear with the drive motor transmits high torque, ensuring smooth and controllable changes in vibration amplitude during adjustment, and preventing material spillage or equipment resonance caused by sudden changes.

The utility model discloses a kind of high-efficiency vacuumizing equipment, belong to vacuumizing equipment technical field, including fuselage, and four dampers for anti-shock protection are arranged below fuselage, the bottom end of four dampers is connected with mounting seat, the right side of fuselage is equipped with back cover, the left side of fuselage is equipped with front cover, and the top of front cover is provided with two air inlet and outlet seats, plug is installed in the inside of two air inlet and outlet seats and penetrates, the top of plug is connected with pipeline, the bottom of fuselage is rotatably installed with two support rods, and the bottom end of two support rods is rotatably connected with moving block. The high-efficiency vacuumizing equipment is provided with damper, mounting seat is connected with four dampers at the bottom of fuselage, the buffering protection performance of fuselage itself can be increased by four dampers, mechanical wear is reduced, key components are protected, resonance between fuselage and pipeline due to rigid connection is avoided, and the service life of vacuumizing equipment is improved.

The utility model discloses a kind of cleaning device for kaolin centrifuge disc piece.The device of the utility model includes: first water tank bottom is equipped with inclined deflector;Variable-frequency high-pressure water pump is connected with branch pipe by main pipe, branch pipe is arranged in the inner wall of first water tank, nozzle is arranged on branch pipe, pulse solenoid valve is arranged on main pipe;Ultrasonic cleaning area includes second water tank and the ultrasonic wave generating device placed in second water tank;Moving track straddles high-pressure cleaning area and ultrasonic cleaning area, the both ends of moving track are respectively rotatably connected with the side wall of first water tank and second water tank, and first limiting structure is used to fixed moving track in horizontal and overturning state;Fixed frame is slidably connected with moving track, and fixed frame is limited and fixed by second limiting structure;A plurality of supports are arranged on fixed frame.The utility model can completely remove the kaolin attached layer on disc piece, improve cleaning efficiency, reduce the damage risk to disc piece.

This utility model relates to the technical field of pipeline vibration damping equipment, and in particular to a device for controlling blasting vibration when a tunnel passes under an adjacent natural gas pipeline. The technical solution includes a base plate and a natural gas pipeline body. An upper clamping plate and a lower clamping plate are provided directly above the base plate to fix the natural gas pipeline body, and a pair of vertical plates are also included at the bottom of the upper clamping plate. This utility model utilizes the cooperation of components such as the base plate, base block, vertical plates, and buffer mechanism. When using the device, the base plate is first fixed through mounting holes, and then the upper and lower clamping plates are used to fix the pipeline using a connecting plate, a second bolt, and a nut. The vertical plates and base block are detachably connected via sliding grooves and a first bolt. When blasting vibration occurs, the vibration sensor transmits a signal to the controller. The controller drives a hydraulic damping shock absorber to absorb the vibration energy. Simultaneously, the insertion rod acts as a limit, and the return spring enhances overall stability, thereby avoiding the risks of resonance, component damage, and leakage caused by rigid connections.

This invention discloses a Buck-Boost converter with integrated short-circuit protection. Based on the Buck-Boost circuit, a discharge branch consisting of a capacitor and an inductor is added to the Buck-Boost converter with protection function. The inductor in the Buck-Boost circuit is coupled to the inductor in the discharge branch, and the anode of the thyristor is connected in series with the source of the MOSFET. This solves the problem of power quality degradation caused by series loads of circuit breakers and reduces the overall system size.

This application discloses an exhaust assembly and a vehicle for a fuel cell vehicle. The exhaust assembly includes an exhaust pipe, a muffler, and a damping pipe. The exhaust pipe is adapted to be installed on the vehicle body. One end of the exhaust pipe has an outlet end, and the other end has an inlet end. A muffler section is formed in the exhaust pipe. The muffler is disposed on the exhaust pipe and on the outer periphery of the muffler section, communicating with the internal cavity of the muffler section. The damping pipe is connected to the exhaust pipe and is disposed near the inlet end of the exhaust pipe, and / or at the junction of the exhaust pipe and the muffler section. At least a portion of the damping pipe is constructed as a flexible element or a flexible unit covering the exhaust pipe is disposed inside the damping pipe, which can improve the muffler and vibration reduction capabilities and reduce vehicle noise.

The invention discloses a moving iron unit, a hearing aid and an assembling method of the moving iron unit. The moving iron unit comprises a magnet yoke, a first magnet, a second magnet, a driving assembly, an induction coil, a vibration unit and a support. A cavity is defined by the magnet yoke, the first magnet and the second magnet are arranged in the cavity, and a gap is formed between the first magnet and the second magnet; the induction coil has a central hole; the driving assembly comprises a balance armature and a driving rod, the balance armature penetrates through the center hole and the interval in a suspended mode, and the driving rod is connected with the balance armature and the vibration unit. The driving assembly drives the vibration unit to vibrate under the condition that the induction coil is electrified; the magnet yoke and the induction coil are limited on the bracket, so that the connection condition of the driving rod and the vibration unit / balance armature can be conveniently checked in the assembling process of the moving iron unit; and meanwhile, the magnet yoke and the induction coil are respectively isolated from the shell of the moving iron unit by the bracket, so that noise and squeal can be reduced from the source.

The invention belongs to the technical field of motor noise reduction control, and particularly relates to a method and system for suppressing vibration noise of a position sensorless control motor. Comprising the following steps: selecting one of a first frequency pulsating voltage signal and a second frequency pulsating voltage signal as a random frequency pulsating voltage signal by adopting a random determination mode; injecting a random frequency pulsating voltage signal under the control of a position sensor, and obtaining a corresponding current response signal; demodulating the current response signal to obtain rotor position information; wherein the matched frequencies of the first frequency pulsating voltage signal and the second frequency pulsating voltage signal are selected, so that a discrete spectrum in a response current PSD frequency spectrum is expanded into a continuous spectrum, and an electromagnetic force wave newly generated by the random frequency pulsating voltage signal is far away from the intrinsic mode frequency of the motor as far as possible. Discrete spectrums of vibration noise caused by injection of random-frequency high-frequency signals are eliminated, and electromagnetic vibration and noise of the motor are effectively reduced.

The air conditioner comprises an air inlet cavity and an air outlet cavity, the air inlet cavity comprises an air inlet, the air outlet cavity comprises a first air outlet, the air inlet and the first air outlet are located on the same side (for example, the lower side) of the air conditioner, and the first air outlet is located at a position of the air outlet cavity away from the air inlet cavity, and a heat exchanger is arranged in the air outlet cavity; in the arrangement direction of the air inlet cavity and the air outlet cavity, the distance between the first edge of the heat exchanger and the second edge of the air inlet cavity is recorded as a first size, the size of the air outlet cavity is recorded as a second size, the ratio of the first size to the second size is greater than or equal to 0.10 and less than or equal to 0.20, and the ratio of the size of the first air outlet to the second size is greater than or equal to 0.20 and less than or equal to 0.32, so that the relationship among the first size, the second size and the size of the first air outlet can be better balanced, thereby realizing a more reasonable space layout, making the size of the heat exchanger more optimal, and better improving the heat exchange effect of the entire air conditioner.

This utility model discloses a special fixture for an ultrasonic fully automatic hot melt welding machine, including a base. A support platform is slidably mounted on the upper surface of the base. A first mounting plate is fixedly mounted on one side of the upper surface of the support platform, and a second mounting plate is fixedly mounted on the other side. A sleeve is fixedly mounted on the first mounting plate, and a telescopic rod is slidably mounted inside the sleeve. A cylinder is fixedly mounted on one side of the second mounting plate. Clamping components are fixedly mounted on both the output end of the cylinder and one end of the telescopic rod. A pressure plate is slidably mounted on the opposite side of the clamping components. Two symmetrically arranged S-shaped clamping plates are slidably mounted on the inner surface of the pressure plate. Through the clamping blocks, pressure plates, clamping plates, second spring, first spring, and telescopic rod, the workpiece can be vibration damped during welding, preventing vibration energy from being transmitted to adjacent components, causing resonance or energy loss, resulting in uneven welding pressure distribution. At the same time, it avoids micro-displacement caused by high-frequency vibration of thin-walled workpieces, greatly improving welding quality.

The application provides a kind of stator core and motor.The stator core includes: first punching unit, the first punching unit includes first tooth part and first yoke part, one connecting joint is formed at the two ends of the first yoke part respectively, and the first punching unit is a symmetrical structure about the center line of the first tooth part;Second punching unit, the second punching unit includes second tooth part and second yoke part, and the second punching unit is a symmetrical structure about the center line of the second tooth part;Multiple first punching units and second punching units are arranged, multiple first punching units and second punching units are staggered and stacked, and two connecting joints axially adjacent can be rotatably connected to form a chain structure, and the chain structure is connected at the head to form the stator core.The application can reduce resonance and noise problems when the motor is running.

The utility model relates to the technical field of fuel tank fixing, in particular to a fuel tank with a vibration reduction fixing device and a tractor. The fuel tank comprises a fuel tank body, a coupling shaft and at least two fixing supports. A plurality of through holes corresponding to the fixing supports are formed in the fuel tank body, the rear ends of a plurality of connecting shafts penetrate through the through holes respectively, and the front ends of the connecting shafts are reserved outside the through holes. The front end and the rear end of the connecting shaft are sleeved with a front anti-vibration pad and a rear anti-vibration pad respectively, and the connecting shaft is erected in the through hole through the front anti-vibration pad and the rear anti-vibration pad. The front anti-vibration pad and the front end of the connecting shaft are connected with the fuel tank body through the front fixing piece, and the rear anti-vibration pad, the rear end of the connecting shaft and the fuel tank body are connected with the fixing supports through the rear fixing piece. Through the design of the front anti-vibration pad and the rear anti-vibration pad, thorough vibration reduction is conducted among the fuel tank body, the connecting shaft and the fixing support, resonance of the fuel tank, an engine and a whole tractor is avoided, and the failure rate of the fuel tank is reduced.

This invention discloses a friction damping bearing with multiple sliding surfaces, belonging to the field of bridge seismic isolation bearings. The lower surface of the upper bearing plate is a convex surface with a radius of curvature R1, and an upper sliding plate is tightly fitted and fixed to the lower surface of the upper bearing plate. The upper surface of the liner plate has a concave curved surface with a radius of curvature R1, the lower surface has a convex curved surface with a radius of curvature R2, and the side surface is an inclined surface. An upper wear-resistant plate, a lower wear-resistant plate, and an inclined wear-resistant plate are tightly fitted and fixed to the upper surface, lower surface, and side surface of the liner plate, respectively. The upper surface of the lower bearing plate has a concave surface, including an inclined surface at the lower bearing edge and a curved surface at the lower bearing center with a radius of curvature R2. The lower sliding plate is tightly fitted and fixed in the concave surface of the lower bearing plate. Curved sliding friction pairs are formed between the upper wear-resistant plate and the upper sliding plate, between the curved surface at the lower sliding plate and the lower wear-resistant plate, and between the inclined surface at the lower sliding plate edge and the inclined wear-resistant plate. The multiple sliding surfaces achieve seismic energy dissipation and buffering / limiting.

The present disclosure relates to a hanger for hanging a first drum and a second drum of a laundry treating apparatus, a side portion of the hanger including a connection portion for connection with a cabinet of the laundry treating apparatus, the connection portion having a support side for abutment with the cabinet, the support side having a length of 260mm or more to 300mm or less. The hanger can reduce or even avoid resonance of the hanger with the drum.

A display device includes a display panel, a back panel, a rear shell, and a speaker assembly. The speaker assembly includes a speaker housing, at least one first speaker, and at least one second speaker. The diaphragm of the first speaker is exposed on the back of the speaker housing and faces the rear shell; the diaphragm of the second speaker is exposed on the front of the speaker housing and faces the back panel. A venting channel is provided on the front of the speaker housing, and the diaphragm of the second speaker is disposed within the venting channel. At least one end of the venting channel forms an outlet. A vent hole is provided on the rear shell corresponding to the outlet, and the vent hole connects the outlet and the outside of the rear shell. The diaphragms of the first and second speakers exert opposite forces on the speaker housing, reducing the resultant force of the diaphragm vibration on the speaker housing, thereby weakening and eliminating vibration. The airflow generated by the vibration of the second speaker is discharged through the venting channel and the outlet, and depressurized through the vent hole.

The utility model relates to the technical field of landing gear, concretely relates to a landing gear damping mechanism. It includes stand, crossbeam, wheel frame and sets up the damping component between stand and crossbeam, and the damping component is constituted by outer tube, piston rod, piston head, honeycomb aluminium energy absorption module group and disc spring bag etc. Honeycomb aluminium energy absorption module group is at least two layers along the axial direction and is equipped with deformation joint between layers, and honeycomb aluminium energy absorption module group, disc spring bag and piston rod are arranged in outer tube from top to bottom, and the conical force transmission rod of piston rod top inserts the central hole of honeycomb aluminium energy absorption module group and forms the conical surface cooperation. The landing gear adopts the "hydraulic damping-honeycomb aluminium-disc spring" compound damping structure, and through honeycomb aluminium graded energy absorption, disc spring nonlinear elasticity and friction damping, hydraulic damping medium energy dissipation, effectively solve the problem of traditional landing gear energy absorption efficiency low, high frequency vibration attenuation deficiency, heavy load impact load concentration etc., and is suitable for high frequency impact and concentrated load working condition, and the damping effect is good.

A coil assembly includes a body, a coil, and first and second external electrodes. The coil includes a first lead-out portion extending to a first surface of the body and a second lead-out portion extending to a second surface of the body. Each of the first and second external electrodes includes an insertion portion at least partially disposed in the body, an extension portion bent from the insertion portion and extending in a second direction perpendicular to the first surface, and a pad portion bent from the extension portion and extending to a third surface of the body. An average length of each extension in the second direction is 0.5 times or less of an average thickness of the body in the second direction and is inversely proportional to a mass of the coil assembly.

This utility model belongs to the field of machining fixture technology, and particularly relates to a positioning device for drilling and milling. It includes a base plate, a first motor mounted on top of the base plate via a shock-absorbing plate, a rotating seat on one side of the machine platform, inner bearings symmetrically arranged on the inner wall of the rotating seat, a rotating column rotatably mounted on the inner bearings, a drive shaft at one end of the rotating column, the drive shaft being connected to the output end of the first motor via a coupling, a locking assembly on the rotating column, linear guide rails symmetrically arranged above the shock-absorbing plate, a telescopic tube mounted above the linear guide rails via a slider, a clamping seat above the telescopic tube, and a lifting mechanism mounted above the linear guide rails via a movable seat. The locking assembly is slidably mounted on the lifting mechanism. This utility model allows for convenient observation and processing of rods, raising one end of the rod to a suitable position, providing excellent clamping and positioning, and enabling real-time correction of the workpiece angle during processing, resulting in more convenient and intuitive operation.

The utility model discloses a kind of washing and draining integrated pump structures of feeding bottle cleaning machine, including cup body, water inlet is equipped on it, first water outlet pipe and second water outlet pipe;Drain pump, it is communicated with the first water outlet pipe;Washing pump, it includes the water connection pipe communicated with the second water outlet pipe;Connecting hose, its two ends are respectively sleeved on the second water outlet pipe and the water connection pipe, to connect and communicate two. The utility model provides a kind of washing and draining integrated pump structures of feeding bottle cleaning machine, by utilizing connecting hose, while guaranteeing water, reduce the vibration of washing pump conduction to cup body, to reduce noise, avoid the case of resonance.

The utility model provides a kind of mirror rotating laser thinning equipment, comprising: feeding conveying line;Discharging conveying line;Laser processing component;Laser processing component includes laser, first reflector being set along laser beam emission direction, diaphragm, second reflector, beam expander, laser beam shaper, dynamic mirror rotating, field lens;First transfer component, first transfer component is located between first transfer station and second transfer station;Second transfer component.The utility model degree of automation is high, work efficiency is high, laser thinning effect is good, effectively avoid the deformation problem and resonance problem caused by thermal expansion of battery piece in processing process.

The invention relates to an active buffering durable oil tank, a vehicle and a control method, the active buffering durable oil tank comprises a tank body, a first electromagnetic unit, a second electromagnetic unit and a control unit, a plurality of partition plates arranged at intervals are fixedly arranged in the tank body, and a first buffering damping plate is fixedly arranged between every two adjacent partition plates; the first electromagnetic unit is fixedly arranged at the top of the partition plate, the second electromagnetic unit is located below the first electromagnetic unit, and the second electromagnetic unit is slidably arranged on the partition plate; the control unit is electrically connected with the first electromagnetic unit and used for adjusting the height of the second electromagnetic unit according to the oil liquid reduction condition. The impact force of oil on the inner wall of the tank body is reduced by arranging the first buffer damping plate in the tank body, the first electromagnetic unit is fixedly arranged at the top of the partition plate, the second electromagnetic unit is slidably arranged below the first electromagnetic unit, the height of the second electromagnetic unit is adjusted according to the oil reduction condition, and the mass center position of the oil tank is changed, so that the problems that oil is reduced, and oil leakage occurs are solved. And the frequency of the oil tank is increased to cause resonance.