134results about How to "Achieve vibration damping effect" patented technology

The invention discloses an energy feedback type damper which can combine piezoelectric ceramic and magnetorheological fluid, wherein the energy feedback type damper can supply electric energy which is generated by piezoelectric electricity generation units due to vibration to the magnetorheological fluid for shock absorption. The energy feedback type damper comprises a cylinder body, a piston rod, the upper piezoelectric electricity generation unit, the lower piezoelectric electricity generation unit, an electric energy extraction and storage unit, a pressure sensor and a controller. The upper piezoelectric electricity generation unit is installed outside a rod body in a sleeved mode. An upper partition plate is arranged below the upper piezoelectric electricity generation unit in an overlapping mode. The lower piezoelectric electricity generation unit is arranged on the inner bottom surface of the cylinder body. A lower partition plate is arranged on the lower piezoelectric electricity generation unit in an overlapping mode. An upper magnetorheological fluid chamber containing magnetorheological fluid is formed between the upper partition plate and a piston body. A lower magnetorheological fluid chamber containing magnetorheological fluid is formed between the piston body and the lower partition plate. The piston body is provided with a plurality of throttling holes. An excitation coil mechanism is installed in the piston body. The upper piezoelectric electricity generation unit and the lower piezoelectric electricity generation unit are connected with the electric energy extraction and storage unit. The pressure sensor is connected with the controller. The electric energy extraction and storage unit is connected with the excitation coil mechanism through the controller. The pressure sensor is installed on the upper partition plate.

The invention discloses a multi-dimensional collision energy consumption mass pendulum damper which consists of a mass ball, a steel cable, a metal cylinder and a viscose elastic material layer, wherein the metal cylinder is an inverted cylinder opening vertically downward; the mass ball, the steel cable and the viscose elastic material layer are all located in the metal cylinder; the mass ball and the steel cable are located in the middle of the metal cylinder; the upper end of the steel cable is fixedly connected with a cylinder bottom plate of the metal cylinder; the lower end of the steel cable is fixedly connected with the mass ball; the mass ball is suspended in the metal cylinder; the viscose elastic material layer is attached to the inner wall of the metal cylinder; and the viscose elastic material layer is arranged in a position capable of enabling collision with the mass ball when the mass ball swings in the metal cylinder so as to realize energy absorption, energy consumption and shock absorption. The damper disclosed by the invention can reduce the vibration reaction of the structure and solve the problem of the structure in seismic resistance and wind resistance.

The invention relates to a novel intelligent vibration reduction electric wheel. According to the requirement for the limited space of a hub, a hub motor, a brake, an intelligent vibration reduction system assembly and the like are designed, and all the designed subsystems are integrated in the limited space of the hub. A vehicle body is used as a target system, and a controllable closed loop system can be formed by combining the novel intelligent vibration reduction electric wheel. The novel intelligent vibration reduction electric wheel mainly comprises an independent suspension support, a symmetrical up-down unequal length swing arm, an MR damper, a spiral spring, a controller, an acceleration and displacement sensor, a wheel spindle, a hub motor, a brake assembly, a hub and a tire part. The acceleration and displacement sensor is used for collecting the accelerated speed of the vehicle body and dynamic displacement signals of a suspension, the accelerated speed of the vehicle body and the dynamic displacement signals of the suspension are transmitted to the controller in real time, a four-channel electric vehicle vibration control strategy is adopted, a variable domain fuzzy control algorithm is used, a control instruction is output to the MR damper to give out electric current change signals, the MR damper is used as an actuator to regulate damping force in real time, and therefore the intelligent damping effect of an electric vehicle can be achieved on urban roads.

The invention belongs to the technical field of vibration attenuation of electrical equipment and power transmission circuits, and relates to a collision energy-dissipation spacing rod. The collision energy-dissipation spacing rod is composed of a mass ball, a spring, a metal hollow ball, a metal circuit tube, a spacing rod frame, a wire clamp and a viscoelastic material layer. The invention aims to solve the problems of being single in function and limited in vibration attenuation effect in the existing spacing rod. When the external environment load is relatively low, the vibration attenuation effect is realized with the help of swinging of the mass ball; when the external environment load is relatively high, the swinging amplitude of the mass ball is increased; the mass ball is collided with a viscoelastic material on the inner wall of the metal hollow ball; the viscoelastic material can absorb a part of energy in the collision process, such that the energy dissipation effect is realized; because the mass ball can swing in a space in any direction and can be collided with the viscoelastic material on the inner wall of the metal hollow ball, the collision energy-dissipation spacing rod has the multi-dimensional vibration attenuation characteristics; and furthermore, the collision energy-dissipation spacing rod is simple to design and manufacture and can be widely applied in the technical field of vibration attenuation of electrical equipment and power transmission circuits.

The invention provides an oil-gas suspension cylinder and a vehicle. The oil-gas suspension cylinder comprises a cylinder barrel, a throttling piston, a piston rod and a pneumatic piston, wherein thethrottling piston is arranged in the cylinder barrel, and is used for partitioning the space in the cylinder barrel into a roded cavity and a rodless cavity; the piston rod is located in the roaded cavity, and connected with the throttling piston; a piston rod barrel cavity is formed in the piston rod; the pneumatic piston is arranged in the piston rod barrel cavity slidably; the piston rod barrelcavity is partitioned by the pneumatic piston into a throttling cavity and a gas cavity independent of each other; and the throttling cavity is adjacent with the rodless cavity and communicates withthe roded cavity. Due to the technical scheme of the oil-gas suspension cylinder, oil-gas separation in the oil-gas suspension cylinder is effectively achieved, so that damping force in two directionsin the oil-gas suspension cylinder is more balanced, and the driving stability of the vehicle can be kept easily; the oil-gas ratio can also be accurately controlled, inflating and deflating are moreconvenient and faster, and maintaining is convenient; and cavitation by mixed gas in oil liquid on sealing pieces and parts can also be eliminated, and the service life of the oil-gas suspension cylinder is prolonged.

The invention discloses a thermal conductive damping plug-in locking assembly for electronic equipment, and aims to provide a fast locking assembly controllable in force transfer and reliable in locking. The locking assembly comprises a bar sliding block (2) which is mounted on a bar base (1) and can slide, a plurality of oblique cylinders or oblique teeth arranged longitudinally are made on the bar base (1), the same number of oblique holes or oblique slots are formed in the bar sliding block (2), special-shaped elastic elements are mounted between the bottoms of the oblique holes or oblique slots of the bar sliding block and the tops of the oblique cylinders or oblique teeth of the bar base, and the oblique cylinders or oblique teeth on the bar base are inserted into the oblique holes or oblique slots of the bar sliding block; and under the coordination of a fixed limiting block (4) and a limiting block (6) mounted at two ends of the bar base, the bar sliding block is pulled or pushed via a screw (5) connected to the fixed limiting block and the bar sliding block, to drive an outer shell (3) to slide up and down on the bar base. The locking assembly is applicable to fast locking and fixation of an electronic module or a PCBA (Printed Circuit Board Assembly) installed in a case slot of the electronic equipment.

The disclosed liquid seal anti-vibration device is provided with: an inner tube (1) and outer tube (2); rubber bodies (3, 4) connecting said inner and outer tubes (1, 2) in a liquid-tight manner at two positions separated in the axis direction; a partition wall which, disposed between the two rubber bodies (3, 4), divides into two parts in the axis direction the space between the inner and outer tubes and which comprises an annular rigid member (5a) and an elastic member (5b); liquid chambers (8, 9) formed by sealing a noncompressible fluid in each of the spaces formed by the partition wall (5); and a restricted passage (7) allowing communication between the two liquid chambers (8, 9) formed by the partition wall (5). The aforementioned partition wall (5) is configured from the annular rigid member (5a), which protrudes from the inner tube (1) towards the outer tube side, and from the elastic member (5b), which connects said annular rigid member (5a) to the outer tube (2). The aforementioned restricted passage (7) is configured from one or multiple passage grooves (5c), which, formed on the outer peripheral surface of the annular rigid member (5a), extend at least one time around the circumference thereof, and from a bounding rigid tube member (6) which, attached to the aforementioned elastic member (5b), seals the openings of the passage grooves (5c) via a seal member (5d) in a liquid-tight manner.

The present invention relates to a heat-dissipation type GPS navigation device with a vibration reduction function for outdoor work, comprising a main body, a strap, a display screen and a circuit board. The display screen is arranged on the top of the main body. The strap is arranged on the main body. The circuit board is in a shape of a cuboid. The circuit board is parallel to the display screen. The circuit board is arranged in the main body. The circuit board is provided with a GPS navigation system. A heat dissipation mechanism and four vibration reduction mechanisms are arranged in the main body. The four vibration reduction mechanisms are uniformly arranged around the circuit board. The heat dissipation mechanism comprises a driving component and two heat dissipation components. Each of the vibration reduction mechanisms comprises a fixing block, an airbag and two vibration reduction components. The heat-dissipation type GPS navigation device with a vibration reduction functionfor outdoor work not only realizes a heat dissipation function through the heat dissipation mechanism, but also realizes buffer and vibration reduction effects through the vibration reduction mechanisms, thereby preventing the circuit board from being damaged.

The invention discloses a machine tool seat with a damping and cushioning mechanism. The machine tool seat comprises a machine seat main body; a lower horizontal supporting plate is arranged below a fixed bottom plate of the machine seat body main body; a supporting leg device is fixed on the side of the lower horizontal supporting plate; a plurality of lower through holes are molded in the side of the lower horizontal supporting plate; a plurality of upper through holes are molded in the side of the fixed bottom plate of the machine seat main body; the upper through holes are aligned with thelower through holes up and down; adjusting studs are arranged in the corresponding upper through holes and lower through holes in an inserting and sleeving manner; damping springs are arranged in themiddle of the adjusting studs in an inserting and sleeving manner; through the damping springs and a middle cushioning spring, the damping effect is realized, and the processing effect is improved; meanwhile, a detachable wear-proof lubricating plate and an inner wear-proof lubricating plate are used, so that a mounting platform cannot be in direct contact with an extending wallboard; and when being worn, the wear-proof lubricating plate and the inner wear-proof lubricating plate can be replaced, and therefore, the replacing and maintaining are convenient, and the effect is good.

A power transmission tower vibration damper comprises a cylinder-shaped metal box body fixedly installed in the center of the top of a power transmission tower, a high-damping spring made of a martensite shape memory alloy is suspended in the center of an inner top plate of the metal box body, a solid steel ball is tied at the lower end of the high-damping spring, and elastic adhesive tapes are pasted to the inner side wall of the metal box body. According to the power transmission tower vibration damper, under the effect of external excitation, the high-damping spring of the damper conducts damping by depending on internal resonance of the swing modal and the vibration modal of the high-damping spring and the restoring force of the high-damping spring when the solid steel ball and the box body do not collide; when colliding with the box body under the effect of a dynamic load, the solid steel ball applies work by depending on collision force of the box body to the solid steel ball to conduct damping; and the mass ratio of the solid steel ball to the power transmission tower, the inner diameter and the height of the metal box body and the length and the strength of the high-damping spring are obtained through provided computational formulas, and the power transmission tower vibration damper can achieve the best damping effect.

The invention relates to the technical field of bridge vibration control, in particular to a swing type lever mass damper capable of controlling spatial vibration of a stay cable. One end of a first connecting rod is provided with a connecting part used for being connected with the stay cable, the other end of the first connecting rod is provided with a damper body, a first rotary shaft is rotatably connected with the middle of the first connecting rod, and the damper body is arranged to generate damping force when the first connecting rod rotates around the first rotary shaft; and one end ofa second connecting rod is rotatably connected with the first rotary shaft, a second rotary shaft is rotatably connected with the other end of the second connecting rod, the second rotary shaft is fixedly connected with a supporting seat, and the supporting seat is used for being fixed to a bridge floor. According to the swing type lever mass damper capable of controlling spatial vibration of thestay cable, when in-plane vibration is conducted on the stay cable, vibration of the stay cable drives the second connecting rod to rotate through the first connecting rod, the connecting part of thefirst connecting rod and the stay cable are rotatably connected with each other, the amplitude of rotation of the second connecting rod driven by the first connecting rod is larger, and therefore a better in-plane vibration damping effect is achieved.

A space inhaul cable anti-collision vibration-isolation type universal connection device comprises two semicircular cable hoop assemblies which are each composed of an A-type semicircular cable hoop and a B-type semicircular cable hoop, and a buffering type universal rotary connector assembly. The every two semicircular cable hoops are connected together through a connecting bolt I in a fastened mode, and PE cable bodies are fixed and connected together through the connecting bolts I; the buffering type universal rotary connector assembly comprises a high-damping elastomer, two universal ballbearings located at the two ends of the high-damping elastomer correspondingly, a compression spring and an elastic sealing body, wherein the compression spring and the elastic sealing body are located in the high-damping elastomer; the universal ball bearings are provided with threaded holes, and the universal ball bearings and the two semicircular cable hoop assemblies are connected together through connecting bolts II, so that the two semicircular cable hoop assemblies and the buffering type universal rotary connector assembly are connected together in a fastened mode to form the space inhaul cable anti-collision vibration-isolation type universal connection device. According to the space inhaul cable anti-collision vibration-isolation type universal connection device, collision betweenthe cables can be prevented, mutual dragging between cable bodies is achieved, and the vibration isolation and reduction effects are achieved; and the demand of multi-angle connection of the space inhaul cables can be met.

The invention discloses an axle sleeve shock absorber and a vehicle. The axle sleeve shock absorber comprises a rubber axle sleeve body (10), a sealing rubber ring (20) and a metal shell (30), wherein the rubber axle sleeve body comprises an axle hole (11); a ring-shaped groove (12) which extends along the circumferential direction of the rubber axle sleeve body is formed in the peripheral surface of the rubber axle sleeve body; the sealing rubber ring is embedded in the ring-shaped groove so as to limit a ring-shaped channel with the ring-shaped groove; and damping fluid (70) is filled in the ring-shaped channel. The vehicle comprises the axle sleeve shock absorber. Through the technical scheme, when an external connection shaft which is arranged in the axle hole vibrates at low frequency, the axle sleeve shock absorber deforms due to the extrusion from the external connection shaft and load, the damping fluid flows back and forth in the ring-shaped groove, and the damping fluid generates friction with the wall surface of the ring-shaped groove and the inner circumferential surface of the sealing rubber ring to convert the kinetic energy into heat, so that the vibration energy is dissipated and the function of absorbing the shock in a low and medium frequency range is realized.

The invention provides a vibration reduction rubber ring structure and an air conditioner with the same. The vibration reduction rubber ring structure comprises a first vibration reduction part and a second vibration reduction part. The first vibration reduction part is provided with a first notch and a first through hole matched with a vibration pipeline of the air conditioner, and the first notch and the first through hole are communicated. The second vibration reduction part is provided with a second notch and a second through hole matched with the vibration pipeline, and the second notch and the second through hole are communicated. The second vibration reduction part is connected with the first vibration reduction part, the second through hole and the first through hole are coaxially arranged, and the first notch and the second notch are arranged in a staggered mode in the circumferential direction of the vibration pipeline. The vibration reduction rubber ring can solve the problem that the reliability of a vibration reduction rubber ring of an outdoor unit of the air conditioner cannot be ensured in the prior art.

The invention discloses an electricity meter mounting rack. The electricity meter mounting rack comprises a bottom plate, two vertical plates and a supporting mechanism are mounted on the bottom plate, the two vertical plates are symmetrically mounted at the two ends of the supporting mechanism, a supporting plate and a limiting mechanism are mounted on one vertical plate, a supporting frame is mounted on the supporting plate, the limiting mechanism is matched with the supporting plate, a vibration reduction mechanism and a locking mechanism are installed on the other vertical plate, the vibration reduction mechanism is matched with the supporting plate, and the locking mechanism is installed on one side of the other vertical plate and matched with the supporting plate. More electricity meters can be installed in a limited space, workers can manage the electricity meters conveniently, more space is saved, later meter reading and maintenance of the workers are facilitated, the device has a vibration reduction function, the electricity meters can be prevented from being damaged on objects with large vibration, the indication precision of the electricity meters is guaranteed, and theservice lives of the electricity meters are prolonged.

The invention discloses a damping device for an exhaust pipe of an automobile, which is arranged between the exhaust pipe and an engine or a speed changer of the automobile. The damping device comprises a damper fixedly arranged on the exhaust pipe and a connecting part; the first end of the connecting part is fixedly connected with the damper; and the second end of the connecting part is fixedly connected with the engine or the speed changer, and a damping part made of a damping material is arranged at the connection of the connecting part and the engine or the speed changer. The damping device for the exhaust pipe of the automobile, provided by the invention, is simple in structure, durable, good in damping effect and capable of being used under the condition that the space is narrow.

The invention discloses a suspension and a vehicle. The suspension comprises an upper cover plate, a lower bottom plate opposite to the upper cover plate and an elastic side wall fixed between the upper cover plate and the lower bottom plate, wherein the elastic side wall, the upper cover plate and the lower bottom plate are connected to constitute a closed hydraulic chamber; a partition board is arranged in the hydraulic chamber and divides the hydraulic chamber into two cavities; damping holes are formed in the partition board, so that a damping liquid circulates between the two cavities through the damping holes. Therefore, when the suspension is subjected to low-frequency and large-amplitude vibration, the elastic side wall is subjected to compression deformation, accordingly, the damping liquid circulates in the two cavities and produces friction with the inner peripheral surface of the elastic side wall, the damping holes and the wall surface of the partition board, kinetic energy is converted into heat energy, meanwhile, part of kinetic energy can be absorbed through deformation of the elastic side wall, and vibration reduction in a low-frequency range is realized; when the suspension is subjected to high-frequency and small-amplitude motivation, the damping liquid almost has no time to flow and vibrates at a high speed together, so that the high-frequency dynamic stiffness of the suspension is improved, and dynamic hardening is eliminated.

The invention discloses an assembly type intelligent vibration isolator. The assembly type intelligent vibration isolator is used for floating support of a floating slab track in the vertical direction. The assembly type intelligent vibration isolator comprises an inner barrel assembly and the outer barrel assembly which are arranged in a sleeved mode in the vertical direction. The upper end of the outer barrel assembly and the floating slab track are integrally formed. The inner barrel assembly is sleeved with the outer barrel assembly, the lower end of the inner barrel assembly extends out of the lower end of the outer barrel assembly and then is used for being connected with a track foundation, and the inner barrel assembly is used for supplying elastic supporting force and hydraulic damping force for telescopic arrangement of the outer barrel assembly in the vertical direction so as to conduct floating supporting on the floating slab track in the vertical direction to reduce vibration. The assembly type intelligent vibration isolator further comprises a vibration energy conversion device. The vibration energy conversion device is arranged in the outer barrel assembly and connected with the inner barrel assembly, and is used for absorbing vibration energy generated by the inner barrel assembly under the action of the outer barrel assembly, converting the vibration energy into electric energy and storing the electric energy so as to supply power to low-power electrical apparatus elements along the floating slab track.

The invention provides an electric drive rear axle assembly, and belongs to the technical field of automobiles. The electric drive rear axle assembly comprises a rear auxiliary frame module, an electric drive module, a rear suspension module, a drive shaft module, a rear brake claw module and a rear suspension module. The rear suspension module comprises an H-shaped control arm, a rear spiral spring, a rear shock absorber, a rear upper control arm, a bridging rod and a toe-in adjusting arm, the H-shaped control arm comprises a first mounting arm, a second mounting arm and a connecting arm, andthe first mounting arm, the second mounting arm and the connecting arm are of an integrated structure; the electric drive module is fixedly installed on the rear auxiliary frame module through the rear suspension module, and the output end of the electric drive module is in transmission connection with the rear brake claw module through the rear drive shaft module. The electric drive rear axle assembly is compact in structure and can be suitable for electric vehicles.

The invention relates to a novel semi-active compound tuned damper which can control structural vibration and reduce wind load as well as structural response under the action of earthquake. The novelsemi-active compound tuned damper comprises a cylinder case, an angle-steel connecting device, a connecting steel tube, an energy-dissipating damping fluid, a cruciform metal plate, spherical hinges and a servo control system. The invention provides a spherical hinge system which can adapt to the randomness of the directions of the actions of wind and earthquake and achieve three levels of vibration damping. The first level of vibration damping is achieved by using the damping fluid for frequency modulation as well as the forces of friction and collision between the damping fluid and the cruciform metal plate. The second level of vibration damping is achieved by using the rotation of the spherical hinges, the cruciform metal plate participates in swinging to form mass tuning, and the inertia force of the cruciform metal plate provides a greater damping effect. The third level of vibration damping is achieved by using the servo control system for controlling; and the one-way force of anactuator is transformed into a force of which the acting direction is opposite to that of the force of earthquake through the spherical hinge system, and the force acts on the cruciform metal plate to enhance the damping effect.

The invention relates to a device for reducing the vibration in the rotating process of rotating elements such as a gear or a gear shaft and the like in an automobile speed changer, in particular to a vibration reduction device of rotating elements. The vibration reduction device comprises a casing (4), a guide part (6) and a rolling body (7), wherein the casing (4) is provided with a sunk part (3), the guide part (6) is fixedly arranged in the sunk part (3) and is provided with a guide surface (5), the rolling body (7) is arranged between the guide surface (5) and the outer surface (2) in a rolling way, and a spring (8) for supporting the rolling body (7) is arranged on the casing (4). When the scheme is adopted, the vibration reduction effect is realized during the abnormal rotation of the rotating elements, the noise caused by the abnormal rotation is further reduced, and the structure is simple.

The invention relates to an overload prevention type transportation device for titanium alloy plate producing and machining. The device comprises a supporting plate and two rotating shafts, wherein the two rotating shafts are uniformly arranged below the supporting plate, rolling wheels are arranged at the two ends of the rotating shafts, a locking mechanism and two connecting mechanisms are arranged on each of the two rotating shafts, the connecting mechanisms are in one-to-one correspondence with the rolling wheels, the connecting mechanisms are located between the rotating shafts and the supporting plate, each connecting mechanism comprises a bearing, a fixing rod, a supporting block, a fixing disc, a fixing pipe, a moving disc, a first spring, a mounting hole and three transmission assemblies, and each locking mechanism comprises a rotating disc, a locking rod, a connecting pipe and a connecting disc. According to the overload prevention type transportation device for titanium alloy plate producing and machining, the stability of the transportation of titanium alloy plates is improved through the connecting mechanisms, and furthermore, the function of preventing overload operation is achieved through the locking mechanisms.

The invention relates to a solar cell with a long service life used for a new energy vehicle. The cell comprises a photovoltaic panel and an installation box. A shape of the installation box is a cuboid, the photovoltaic panel is arranged on a top of the installation box, a gap is arranged between the photovoltaic panel and the installation box, and an auxiliary mechanism and a vibration reductionmechanism are arranged on the installation box. The vibration reduction mechanism is located between two connecting pipes. The vibration reduction mechanism includes two vibration reduction components, and the vibration reduction components form one-to-one correspondence with the connecting pipes. By using the solar cell with the long service life used for the new energy vehicle, through the auxiliary mechanism, a function of removing frost on a photovoltaic panel is realized. The auxiliary mechanism includes an air injection device, a heating device, and two execution devices. A condition that the frost affects absorption of light by the photovoltaic panel is avoided and power generation efficiency is increased. Besides, through the vibration reduction mechanism, buffer and vibration reduction effects are realized, the photovoltaic panel can be prevented from being damaged because of vibration and the service life is prolonged.

The invention discloses an energy feedback type damper which can combine piezoelectric ceramic and magnetorheological fluid, wherein the energy feedback type damper can supply electric energy which is generated by piezoelectric electricity generation units due to vibration to the magnetorheological fluid for shock absorption. The energy feedback type damper comprises a cylinder body, a piston rod, the upper piezoelectric electricity generation unit, the lower piezoelectric electricity generation unit, an electric energy extraction and storage unit, a pressure sensor and a controller. The upper piezoelectric electricity generation unit is installed outside a rod body in a sleeved mode. An upper partition plate is arranged below the upper piezoelectric electricity generation unit in an overlapping mode. The lower piezoelectric electricity generation unit is arranged on the inner bottom surface of the cylinder body. A lower partition plate is arranged on the lower piezoelectric electricity generation unit in an overlapping mode. An upper magnetorheological fluid chamber containing magnetorheological fluid is formed between the upper partition plate and a piston body. A lower magnetorheological fluid chamber containing magnetorheological fluid is formed between the piston body and the lower partition plate. The piston body is provided with a plurality of throttling holes. An excitation coil mechanism is installed in the piston body. The upper piezoelectric electricity generation unit and the lower piezoelectric electricity generation unit are connected with the electric energy extraction and storage unit. The pressure sensor is connected with the controller. The electric energy extraction and storage unit is connected with the excitation coil mechanism through the controller. The pressure sensor is installed on the upper partition plate.

The invention discloses an efficient double-layer multistage vibrating screen which comprises a base, a rack, an upper-layer fixed screen box, an upper-layer floating screen box, a lower-layer fixed screen box, a lower-layer floating screen box and a vibration excitation movement device. The upper-layer floating screen box and the lower-layer floating screen box are suspended and mounted on the rack through multiple upper-layer elastic suspension rods and lower-layer elastic suspension rods which are symmetrically arranged left and right, and flexible screens are connected between two adjacent screen supporting frames of the upper-layer fixed screen box and the upper-layer floating screen box and two adjacent screen supporting frames of the lower-layer fixed screen box and the lower-layer floating screen box. The vibration excitation movement device comprises an eccentric vibration excitation shaft, a driving vibration exciter, a driven vibration exciter, spring guide devices, a fixing frame, an up-down limiting guide sliding mechanism, an upper-layer transmission rod, a lower-layer transmission rod and a steering rod. According to the efficient double-layer multistage vibrating screen, on the premise that material particles can be better, rapidly and comprehensively screened in a layered manner, dry type efficient screening of materials large in viscosity and difficult to screen can be achieved, the fine particle material screening probability is increased, and the efficient double-layer multistage vibrating screen is particularly suitable for raw coal grading screening in the coal dressing process.

The invention provides a global controllable duplex semi-active vehicle suspension system which comprises a guide mechanism and a four-quadrant semi-active damping adjustable actuator, the four-quadrant semi-active damping adjustable actuator comprises a damping mechanism and a duplex mechanism, and the duplex mechanism comprises a first rack, a second rack and a reversing gear. The reversing gearis located between the first rack and the second rack and engaged with the first rack and the second rack. The damping mechanism comprises two damped and adjustable shock absorbers, the top ends of shock absorber bodies of the two shock absorbers are jointly installed on the same tower top, and the bottom ends of piston rods of the two shock absorbers are connected with the top ends of the two racks respectively; the bottom end of the first rack is hinged to a steering horn of the guide mechanism, and the tower top of the damping mechanism is connected with a vehicle body. And a gear shaft ofthe reversing gear is connected with the frame or the vehicle body through a connecting rod. The global controllable duplex semi-active vehicle suspension system has the advantages that the semi-active vehicle suspension system has a global control range and is low in energy consumption and high in reliability.

The invention relates to a device and process for operating at least one contact roller (1) in contact with a take-up roller (0) or with a polymer film bale (0') wound to the take-up roller (0), preferably in a plant for stretching a polymer film which is, after the stretching step, wound to said take-up roller (0) rotatable around a rotational axis, said at least one contact roller (1) being rotatable around a rotational axis arranged parallel to the take-up roller's rotational axis, being supported movably by variable distances perpendicular relative to the take-up roller's rotational axis and providing for a permanent application of a predetermined pressure to the polymer film (2) during said winding to the take-up roller or polymer film bale (0') along a contact line being parallel to the axes of the take-up and contact rollers (0, 1) and on the surface of the contact roller (1) and take-up roller (0) or polymer film bale, said device comprising a direct gearless-drive motor means (10) for exerting a rotational drive force around a motor axis (11); said motor axis (11) being substantially parallel to the axes of the contact and take-up rollers (0, 1) and being capable of actuating force transmission means (20) by its rotational movement; said force transmission means (20) being connected to and actuated by said motor means (10) and transforming the rotational drive force exerted by the axis (11) of the direct gearless-drive motor means (10) into a translational drive force substantially perpendicular to the motor axis (11); and said force transmission means (20) being capable of transmitting said translational drive force to the contact roller (1), thereby moving the contact roller (1) towards, or away from, the take-up roller (0).

The invention relates to wireless communication equipment with a good damping effect. The wireless communication equipment comprises a main body, a circuit board and two antennas; the main body is ina cuboid shape; the circuit board is horizontally arranged in the main body; the two antennas are vertically arranged on the two sides of the main body respectively; a network signal processing systemis arranged in the main body; an auxiliary mechanism and four buffer mechanisms are arranged in the main body; the buffer mechanisms are distributed on the circuit board in a matrix manner; the buffer mechanism comprises a mounting hole, a fixing rod, two connecting assemblies and four buffer assemblies; the connecting assembly comprises a connecting ring and a first spring; the auxiliary mechanism comprises a baffle and two auxiliary assemblies; and each auxiliary assembly comprises a rotating unit and a detecting unit. According to the wireless communication equipment with the good dampingeffect, the buffering and damping effects are achieved through the buffering mechanism, in addition, the function of storing the antenna is achieved through the auxiliary mechanism, and the situationthat the antenna is smashed due to the fact that an object falls off during an earthquake is prevented.

The invention discloses a track vibration damping support device, which relates to the technical field of track vibration damping, comprising an upper connecting plate assembly, a lower connecting plate, an elastic vibration damping assembly and a damper, wherein the upper connecting plate assembly is used for supporting a track beam; the lower connecting plate is used for connecting with the bridge main body; the two ends of the elastic damping assembly in the vertical direction are respectively connected with the upper connecting plate assembly and the lower connecting plate, and the elasticdamping assembly can be elastically deformed at least in the vertical direction; at least one damper is arranged on both sides of the elastic damping assembly, the upper end of the damper is connected with the upper connecting plate assembly, the lower end of the damper is connected with the lower connecting plate, and the damper at least limits the vertical displacement between the upper connecting plate assembly and the lower connecting plate. The rail vibration damping support device has good vibration damping and noise reduction effect, and can reduce the vibration displacement of the rail, and ensure the stability and safety of the running of the rail vehicle.