86results about How to "Reduce vibration disturbance" patented technology

The invention discloses a railway fastener abnormality detection system based on monocular vision and laser speckles. The railway fastener abnormality detection system is used for detecting whether fasteners are abnormal or not and comprises laser speckle projectors, area array cameras, a wheel encoder, an RFID detector and an industrial personal computer, wherein the laser speckle projectors andthe area array cameras are arranged above a bottom sleeper of a train body, the laser speckle projectors are positioned right above the fasteners and project laser speckles towards fastener areas perpendicularly, the wheel encoder is fixed on a rotating shaft of a wheel and connected with the area array cameras, the RFID detector is fixed below the train body, and the industrial personnel computerpositioned in a carriage is connected with the area array cameras, the wheel encoder and the RFID detector. The railway fastener abnormality detection system has the advantages that with mottled grains on the surfaces of the fasteners increased through the laser speckle projectors, image block matching precision can be improved and the three-dimensional topography of the fasteners is constructedaccurately, so that various abnormalities of different types of fasteners can be detected effectively.

The invention discloses a testing system and a testing method for the propeller ground test in the near space. The system comprises an incoming flow simulation system, a propeller rotating speed control system, a data measurement system and a support. The data measurement system comprises a two-component balance and a data acquisition and control module. The forward velocity and the rotating speed of a propeller are respectively and precisely controlled by a trailer and a motor. The propeller rotating speed control system comprises a motor, wherein the motor is fixed inside the two-component balance. The end portion of the output shaft of the motor extends out of the two-component balance. The propeller is fixed at the end portion of the output shaft of the motor and is driven by the motor to rotate. The support is of a cantilever beam structure, and the rear end of the cantilever beam structure is fixed at the front end of the head part of the trailer and is extending forwardly. The two-component balance is fixed at the front end of the support. According to the technical scheme of the invention, the test state is simulated by utilizing a track trailer. The forward velocity of the trailer is relatively low and the velocity control precision of the trailer is relatively high. Therefore, a stable incoming-flow environment is provided for the propeller.

The invention discloses an unbalance amount measuring device and a method thereof. A flat-plate-type vibrating piece is arranged in the extension part of a dynamic balance testing device, and the flat-plate-type vibrating piece only vibrates in two orthogonal directions of a plane in which the vibrating piece is arranged. Therefore, irregular tremor effects generated by driving wheels are shielded, and rotation amplitude generated by unbalance and vibration data formed due to the self-weight of a detected tire and a rotation shaft are intensively transmitted to a sensor group so as to improve the accuracy of detection data and further improve unbalance mass detection and rating dimension. The measuring device comprises the vibrating piece and the sensor group, wherein the vibrating piece is connected between a fixed seat and a shell of the rotation shaft. Two connecting ends of the vibrating piece are arrayed along the extension direction of the axial center line of the rotation shaft. The sensor group is at least provided with a horizontal sensor and a vertical sensor. The vertical sensor is arranged in parallel with the vibrating piece and the horizontal sensor is perpendicular to the plane in which the vibrating piece is arranged.

The invention discloses a chain saw and an electric tool. The chain saw includes a working part, a tool body, a brushless motor, a drive circuit, a controller and a motion detection device. The motiondetection device is connected with the tool body or the working part in a linkage mode for detecting the movement change of the tool body or the working part in at least one direction; and the controller is configured to control the drive circuit to enable the brushless motor to enter a braking process when the motion detection device detects that the change amount of movement of the tool body orthe working part in at least one direction exceeds a preset threshold value. The invention further provides a control method of the electric tool. The chain saw and the electric tool are simple in implementation method of recoil detection, simple in data processing, small in vibration interference and more accurate in detection; and meanwhile, quick braking can be realized faster, so that safetyaccidents caused by recoil can be effectively avoided.

The invention provides a film-type two-way hydraulic vibration near-resonance type double-drum vibrating mill, comprising drums, film-type hydraulic vibration exciters, near-resonance spring groups, bases and hydraulic devices, wherein each film-type hydraulic vibration exciter comprises a film made of a flexible material, and two parallel rigid panel I and rigid panel II; the film is arranged between the rigid panel I and the rigid panel II; the film can form a closed space for containing a liquid independently or together with the rigid panel I or the rigid panel II; the liquid can pass in and out of the closed space through a channel; the closed space is communicated with a hydraulic source of which the flow direction periodically changes through the channel; the vibrating mill does not need a bearing; the hydraulic device does not need a piston; the exciting force can be completely balanced; the film-type two-way hydraulic vibration near-resonance type double-drum vibrating mill is simple to manufacture, convenient to repair, low in cost, high in vibration force, free of abrasion, free of leakage, free of heat dissipation, even in vibration force distribution, low in energy consumption, and small in external vibration interference; stepless frequency modulation and amplitude modulation can be achieved without shutdown; and the frequency modulation is uncorrelated to the amplitude modulation.

The invention provides a diagnosing experiment platform for a non-linear vibration fault of gears. The diagnosing experiment platform is applied to the technical field of gear vibration fault diagnosis. Two gears of a gear reducer in the experiment platform are connected with an input shaft and an output shaft respectively in a cantilever structural form. The input shaft and the output shaft are respectively fixed to a bearing seat through bearings with a certain distance. The output shaft is connected with a load servo motor through a belt, a vibration sensor is arranged on the bearing seat, the vibration sensor is in electrical connection with a signal amplifier, a signal amplified by the signal amplifier is transmitted to a signal processing computer through a data acquisition card, and parameter setting and state monitoring are conducted on a drive servo motor and the load servo motor through corresponding controllers and human-machine interfaces. The diagnosing experiment platform for the non-linear vibration fault of gears is small in vibration interference, the gears are convenient to disassemble, the gears can be accurately loaded through loading of the servo motor, vibration caused by mechanical loading and the beat vibration phenomenon of the gears in the time of no-load is avoided, and a structure is simple.

The invention belongs to the technical field of the multi-wire cutter main shaft loading test, and especially relates to a multi-wire cutter double-main shaft loading test stand. The multi-wire cutterdouble-main shaft loading test stand comprises a base, a motor mounting seat and a main shaft mounting seat; the motor mounting seat and the main shaft mounting seat are arranged on the base; a motoris arranged on the motor mounting seat; a driving shaft is arranged at 1 / 2 of the main shaft mounting seat, and a driven shaft is arranged on the other 1 / 2 of the main shaft mounting seat; a torque loading device is arranged between 1 / 2 of the driving shaft and the driven shaft, and a main roller is arranged between the other 1 / 2 of the driving shaft and the driven shaft; and a net tension loading device is arranged at one side of the main roller. The loading test is performed on the main shafts through the torque loading device and the net tension loading device, the operation performance ofthe main roller can be comprehensively reflected; various performance indexes of the main shafts can be reflected by arranging multiple sensors, and a computer is used for recoding and analyzing, a tested object can be comprehensively assessed, and the application field is wider.

The invention discloses a take-off and landing device of a rotor wing unmanned plane. The device comprises an outer cylinder, wherein the outer cylinder is movably connected with an inner cylinder through a first spring body in a sleeving mode, a support frame is connected to the bottom of the inner cylinder, a plurality of through holes are formed in the top of the outer cylinder in an annular configuration, first connecting rods are movably inserted in the through holes, a wind board is fixedly connected to the tops of the first connecting rods, first wedge shape parts are connected to the inner sides of the first connecting rods through first elastic expansion and contraction bodies, second wedge shape parts which are in selective contact with the first wedge shape parts are fixed to the outside of the inner cylinder, spacing boards which are in selective contact with the top of the inner cylinder are fixed to the inner sides of the first connecting rods, a second elastic expansion and contraction bodies are connected to the outer sides of the first connecting rods in a sleeving mode, and two ends of the second elastic expansion and contraction bodies are connected with the wind board and the outer cylinder respectively. The invention further discloses a take-off and landing method of the take-off and landing device of the rotor wing unmanned plane. According to the device, the shortage of the prior art can be improved, an oil liquid buffering structure is not used, and the self-weight of the rotor wing unmanned plane is further lowered.

The invention relates to a double-host distributed optical fiber type prestressed pipeline running safety prewarning system which comprises an indoor module and an outdoor module, wherein the outdoor module comprises a pipeline-end coupler, a leading-in-end coupler and a leading-out-end coupler; the leading-out-end coupler and the leading-in-end coupler which are matched with each other are arranged outside a butterfly valve of a prestressed pipeline respectively and connected through an optical fiber; the optical fiber distributed on the inner wall of the prestressed pipeline is guided to the outside of the prestressed pipeline through the leading-out-end coupler and guided to the inside of the prestressed pipeline through the leading-in-end coupler; the indoor module comprises two computers, two data acquisition cards, two photoelectric detectors, two semiconductor lasers and two indoor couplers. The system is simple in structure, scientific and reasonable in design, very high in monitoring sensitivity and positioning accuracy for steel wire breakage, easy to realize, reliable in running and more suitable for long-distance prestressed pipelines.

The invention belongs to the technical field of prefabricated assembly type buildings, and discloses a building civil engineering construction prefabricated assembly type structure which comprises a prefabricated assembly, and the prefabricated assembly comprises a prefabricated pile, prefabricated connecting bases fixed to the four sides of the prefabricated pile and prefabricated beams installed on the prefabricated connecting bases; and the limiting assembly comprises an inserting groove formed in the prefabricated connecting base, a first cavity groove, a first spring, limiting blocks symmetrically connected to the two ends of the first spring, limiting columns installed on the limiting blocks and limiting holes symmetrically formed in the two sides of the prefabricated connecting base. The end of the precast beam can be firmly locked in the precast connecting seat, so that the connecting strength between the precast beam and the precast pile is enhanced, loosening and cracking between the precast beam and the precast pile are prevented, the structural stability is greatly improved, and the precast beam connecting seat is convenient to assemble and good in using effect.

The invention discloses a waterproof layer structure for a parking lot ground. The waterproof layer structure comprises a packed soil bottom layer, and a concrete base plate, a cement mortar screeding layer, an SBS modified asphalt waterproof sheet material, a cement mortar protection layer, a first reinforced concrete layer, a ceramsite concrete layer, a second reinforced concrete layer and a concrete surface layer are sequentially laid on the packed soil bottom layer from bottom to top. The waterproof layer structure for the parking lot ground solves the problem that an existing waterproof layer is likely to lose efficacy and leaks water, and achieves the purposes of improving the waterproof effect and prolonging the service life.

The invention discloses a multifunctional solid-phase low-temperature electrochemical nuclear magnetic resonance combination system experiment support frame. The frame comprises a main frame, a low-temperature vacuum supporting and shock absorbing frame module, a low-temperature tank positioning and protecting frame module, a displaying frame module and a low-temperature chamber lifting module, wherein the main frame comprises longitudinal stand columns, transverse support rods, layer rods and a grounded wire; the longitudinal stand columns are used for dividing the main frame into a left magnet area and a right low-temperature area; the layer rods are used for dividing the main frame into an upper layer and a lower layer; the low-temperature vacuum supporting and shock absorbing frame module comprises positioning rods and shock elimination sheets; the low-temperature tank positioning and protecting frame module comprises positioning transverse rods, positioning vertical rods and a longitudinal stand column of the main frame; the displaying frame module is located on the lower layer of the right side wall of the main frame; the low-temperature chamber lifting module comprises positioning vertical rods, positioning transverse rods, a clamping hoop lifting disc set, a pulley block and a hand cranking device. Through the adoption of a non-magnetic splicing material, all the function modules are spliced on the main frame; the function expandability of the frame is improved; the vibration interference of a vacuum pump is reduced; the speeds in processes of assembling and disassembling the low-temperature chamber can be effectively controlled.