33results about How to "No transmission loss" patented technology

The invention belongs to the field of electromechanical technique, and relates to a spherical moving robot, and in particular relates to a fluid driving spherical robot which comprises a spherical shell, an annular seal container, axial flow devices, an inner driving rotating mechanism and a main shaft. The fluid driving spherical robot is characterized in that the spherical shell consists of two hemispherical shells including a left hemispherical shell and a right hemispherical shell; the annular seal container is positioned in the spherical surface; the outer annular surface of the container is concentric with the spherical surface of the spherical shell; the container is filled with fluid; the volume of the fluid is half of the volume of the container; two axial flow devices are symmetrically installed in the annular seal container; the axial flow devices drive a liquid to flow in the annular seal container, thus the mass center of the spherical robot is changed, thus the spherical robot can move forwards and backwards; the inner driving rotating mechanism positioned in the spherical shell mainly comprises an inner driving bracket, a motor, a motor support, a flywheel shaft, a flywheel, an electricity supply power supply and a controller; the main shaft is fixedly connected with the inner driving bracket through the motor support; the fly wheel is installed on the inner driving bracket through a bearing; the motor shaft is connected with the fly wheel through a coupling; and the motor drives the lower part of the motor to rotate together with the flywheel shaft vertical to the main shaft and the fly wheel, and the spherical robot takes a turn under the driving of the fluid on the basis of an angular momentum conservation principle.

The invention discloses a permanent magnet synchronous motor direct driven energy-saving ball mill. The permanent magnet synchronous motor direct driven energy-saving ball mill comprises a rotating drum, wherein a feeding end and a discharge end are respectively arranged at the two ends of the rotating drum; the rotating drum is arranged inside sliding bearings in a sleeving manner; the sliding bearings are arranged on bearing support frames; a ring motor sleeves the surface of the rotating drum; the ring motor is arranged on a motor bracket; the ring motor comprises a motor shell, a stator and a rotor; the motor shell is fixed to the motor bracket; a stator iron core and a stator winding are arranged inside the stator; the stator is fixedly arranged inside the motor shell; the rotor is a permanent magnet magnetic pole fixedly connected with a magnetic pole bracket; and the magnetic pole bracket is fixedly arranged on an outer shell of the rotating drum. According to the permanent magnet synchronous motor direct driven energy-saving ball mill, the permanent magnet magnetic pole is directly mounted on the surface of the rotating drum, the ring motor directly drives the rotating drum, a complex transmission mechanism is avoided, the operation is more stable, transmission loss is avoided, the floor space is smaller, one workshop can be equipped with more ball mills, the production efficiency is improved, and energy conservation and emission reduction are facilitated.

Provided is a microwave-, milliwave-band, high-frequency pulse signal generation device which makes it possible to achieve a simpler structure, improved performance, smaller integration, easier design, lower power consumption, and lower cost. A planar radiation oscillator substrate (S1) having an inner layer (GND12) interposed between a front dielectric substrate (10) and a back dielectric substrate (11) is provided with a pair of axially-symmetrical conductive patches (4, 4) in the radiating surface. A gate electrode (2) and a drain electrode (3) of a microwave transistor (1) are connected to each of the conductive patches (4, 4). A DC bias is supplied through an RF choke circuit (5a) to the gate electrode (2). A monopulse is supplied from a monopulse generation circuit (7) through an RF choke circuit (5b) to the drain electrode (3). An impedance line (9) which satisfies the oscillation conditions is connected to a source electrode (8). A high-frequency pulse signal, having an oscillation frequency and frequency bandwidth which are determined on the basis of the negative resistance generated by the short-time operation of the microwave transistor (1) and a resonant cavity structure, radiates into space simultaneous to being generated.

The present invention is one kind of laser device. The small mechanical variable laser strength attenuator includes laser input unit; laser strength attenuating unit, laser output unit and control unit connected via optical path. Laser beam is projected via the laser input unit to the laser strength attenuating unit on the angle turning part of the control unit, its incident angle is regulated by the control unit, and the laser beam after being attenuated in the laser strength attenuating unit is output via the laser output unit. The present invention is used in optical communication, optical information processing and other fields needing laser strength attenuation as well as precise ranging, holographic information processing, etc.

The invention discloses a high-performance adhesive for optical communication devices and a preparation method thereof, relating to the technical field of high-polymer materials. The high-performance adhesive for optical communication devices is prepared from the following raw materials in parts by mass: 40-90 parts of cationic polymer resin, 2-30 parts of free radical photopolymer resin, 2-20 parts of polylol, 0.5-10 parts of photoinitiator, 0.05-5 parts of thermal initiator, 0.05-2 parts of coupling agent, 0.01-1 part of polymerization inhibitor and 0-10 parts of other assistants. The preparation method comprises the following steps: first mixing, second mixing and compound mixing. The high-performance adhesive for optical communication devices has the characteristics of quick curing, consistent refractivity with glass, favorable light transmittance, excellent adhesion force, high Tg, low shrinkage, high stability, excellent constructability, simple operability and the like, and can be applied to chips or bare fibers in optical communication industry and fixed in a V groove to be bonded and fixed with the cover plate.

The invention discloses a permanent magnet direct-driven traction transmission system and method. The permanent magnet direct-driven traction transmission system comprises a high-voltage box, tractioninverters, a permanent magnet direct-driven synchronous traction motor and a silicon carbide inversion module; the high-voltage box is connected with the traction inverters; and the traction inverters are in drive connection with the permanent magnet direct-driven synchronous traction motor. The permanent magnet direct-driven traction transmission method comprises the steps that 1, the high-voltage box is supplied with high-voltage electricity; 2, the high-voltage box distributes the high-voltage electricity to the traction inverters; 3, the traction inverters output the three-phase alternating current through the silicon carbide inversion module to an input power source inverter; 4, the three-phase alternating current is filtered into standard sine waves through a sine filter; and 5, thesine waves pass through a three-phase isolation contactor to be output to the permanent magnet direct-driven synchronous traction motor, and the permanent magnet direct-driven synchronous traction motor drives a train to advance. Electricity supply is more efficient, and electromagnetic radiation of cables between the permanent magnet direct-driven synchronous traction motor and the inverters isreduced significantly.

The invention discloses a carbon fiber composite lead wire core, a preparation method thereof and a lead wire comprising same. The carbon fiber composite lead wire core comprises an aluminum alloy cylinder and carbon fibers which are uniformly distributed in the aluminum alloy cylinder and provided with silica coating. The lead wire core obtained in the invention is high in strength, has the tensile strength higher than that of a common steel core by about one time and higher than that of a high-strength steel core by 40%, is low in line loss and high in conductivity, has no magnetic loss thermal effect caused by a steel wire material, and has lower operating temperature under the condition of conveying the same load to reduce power transmission loss by about 6%, is small in sag, has significant low sag characteristics compared with a conventional lead wire, and high allowable working temperature, is high in current-carrying capacity, has the aluminum product section of the lead wire with the carbon fiber core being 1.29 times that of a conventional ACSR (Aluminum Conductor Steel Reinforced) under the condition of same quality, is light in weight, has the density of the carbon fibers and the aluminum alloy being 1.8 g / cubic centimeter and 2.7 g / cubic centimeter respectively, and corrosion resistant, with long service life.

The invention discloses a fault line selection device applied to an intelligent substation, which comprises a first communication module, a Fourier transformation module, a second communication module, a third communication module, a line selection module and a fourth communication module, wherein the first communication module is connected with the line selection module via the Fourier transformation module; and the second communication module and the third communication module are respectively connected with the fourth communication module and the line selection module. According to the fault line selection device with the above structure, with the full help of the existing architecture system of the intelligent substation, each module of the line selection module is designed according to an IEC 61850 standard, and standardization of the line selection device is realized.

The invention provides an electromagnetic inserting piece type concrete vibrator which comprises a horseshoe-shaped iron core and an excitation coil wound on the horseshoe-shaped iron core. The two magnetic poles of the horseshoe-shaped iron core both extend downwards to form two silicon steel pieces, and the excitation coil is electrically connected with an alternating-current power supply. The vibrator is free of work noise, low in cost, small in energy consumption, large in vibration action face and high in work efficiency.

The invention provides a television capable of supporting multiple digital television standards, wherein a central processing device transmits a passage selection signal and channel selection signals according to a current working state of the television; a first receiving device receives RF (Radio Frequency) signals of a first standard, and obtains an RF signal of a corresponding channel in the RF signals of the first standard according to a first channel selection signal and converts the RF signal into a first intermediate frequency signal; a first demodulation device demodulates the first intermediate frequency signal into a first transport stream signal; a second receiving device receives RF signals of a second standard, and obtains an RF signal of a corresponding channel in the RF signals of the second standard according to a second channel selection signal and converts the RF signal into a second intermediate frequency signal; a second demodulation device demodulates the second intermediate frequency signal into a second transport stream signal; a first switching device receives the transport stream signals according to the passage selection signal; a decoding device receives and decodes the transport stream signals and then outputs the decoded signals; a display device receives and displays the decoded signal; and an image treatment device connected between the decoding device and the display device is used for performing image enhancement treatment or scaling treatment to the decoding signals.

An accessory drive apparatus includes a power source, an accessory system that provides an input to the power source, an accessory driving source that drives the accessory system, and a power combination / distribution mechanism that is connected to the power source and the accessory system to transmit power from both the power source and the accessory driving source to the accessory system. With this arrangement, the accessory system is driven by a combination of power received from the accessory driving source and the power source.

The present invention discloses a Longmen n. broad width three-dimensional solid body laser inner carving apparatus with high speed which includes a machine body, a laser cooling device is set in the machine body bracket, an operation table-board is set on the machine body bracket, two Y axis moving support tramroads and a Y axis drive transmission device are set on two sides of the machine body bracket of the operation table-board, a X axis moving support tramroad and a X axis drive transmission device, which can move along the Y axis moving support tramroad, are connected between two Y axis moving support tramroads, a moving platform is connected with the X axis moving support tramroad, two Y axis moving support tramroads are equipped with transmission devices respectively, an input end of the transmission device connects with a servo-motor with synchronous operation, the moving platform connects with a Z axis moving tramroad and a Z axis moving drive transmission device, the moving platform also is equipped with a laser and a light route. The Longmen broad width three-dimensional solid body laser inner carving apparatus with high speed has compact and simple structure for realizing broad width inner carving with high speed, such as 1500*1000 mm, and can be widely used in the glass decoration industry.

The invention belongs to the field of electromechanical technology, and relates to a spherical mobile robot, in particular, to a fluid-driven spherical robot, which includes a spherical shell, an annular sealed container, an axial flow device, an internal drive rotation mechanism, and a main shaft; it is characterized in that: the spherical shell is composed of The left and right hemispherical shells are composed of two hemispherical shells; the annular sealed container is located inside the spherical shell, the outer ring surface of the container is concentric with the spherical surface of the spherical shell, and the fluid is contained inside the container, and the volume of the fluid is 1 / 2 of the volume of the container. The axial flow device drives the liquid to flow in the annular sealed container, thereby changing the center of mass of the spherical robot, thereby realizing the forward and backward of the spherical robot; the internal drive rotation mechanism located inside the spherical shell mainly includes: internal drive bracket, motor, Motor bracket, flywheel shaft, flywheel, power supply and controller, etc.; the main shaft is connected to the spherical shell through bearings, other parts of the internal drive rotation mechanism are suspended on the main shaft through the internal drive bracket, and the motor is fixed to the internal drive bracket through the motor bracket Connection, the flywheel is installed on the internal drive bracket through the bearing, the motor shaft and the flywheel are connected through the coupling, the motor drives the flywheel shaft and the flywheel whose lower part is perpendicular to the main shaft to rotate together, and realizes the steering of the fluid-driven spherical robot by using the principle of conservation of angular momentum .

Disclosed is a high-efficiency electric steering pump. An output shaft of the steering pump and an output shaft of a motor are of a coaxial structure. An oil feeding side plate, a stator and an oil drainage side plate are in through connection with a pump body through a positioning pin. One end of the pump body is provided with a pump cover. A rotor is installed in an inner hole of the stator. A blade is installed in a slot hole of the rotor. One end of a sliding valve is provided with a spring. A cone valve is arranged inside the sliding valve. A spring is arranged between one end of the cone valve and the sliding valve. The end, provided with the spring, of the sliding valve is connected with an oil drainage connector. According to the high-efficiency steering pump, a traditional transfer way of coupling connection of a coupling, a gear and the like is canceled, the output shaft of the steering pump and the output shaft of the motor are designed as one shaft, one end of the shaft is assembled to the motor, and the other end of the shaft is assembled to the steering pump. When a motor shaft is rotated, internal components of the steering pump are directly and synchronously driven to operate, work of the steering pump is achieved, and no transfer loss is caused in the operation. Besides the design characteristic that transfer efficiency is improved, the structure inside the steering pump, except for design parts of a bearing and a check ring is simplified.

The invention relates to a NMOS transistors based 90-degree phase shifter, which belongs to the technical field of the design of radio frequency microwave integrated circuits. The 90-degree phase shifter consists of an input end, a first second-order all-pass filter and a second second-order all-pass filter which are driven in parallel, a first output end and a second output end, wherein the first second-order all-pass filter comprises two NMOS transistors which are connected in series, a capacitor and two capacitors and resistors which are connected in parallel; and the second second-order all-pass filter comprises two NMOS transistors which are connected in series, a capacitor and two capacitors and resistors which are connected in parallel. The NMOS transistor based 90-degree phase shifter achieves 90-degree phase-shifting in a small area by using a CMOS process with low cost and low power consumption, and has the following two advantages that: firstly, the 90-degree phase shifter has no transmission loss and can adjust the gain thereof through an active element; and secondly, the 90-degree phase shifter is compatible with a standard CMOS process, and has low cost, low power consumption, high integration and wide working band.

The invention relates to a change-speed gearbox for motor vehicles, in particular manual gearboxes, having a plurality of forward gears and, optionally, one reverse gear, at least one input shaft, an output shaft and, optionally, a layshaft, between which the idler gears, which can be shifted via synchronous clutches, and the fixed gears of the gearwheel sets are arranged. At least one of the shafts (14; 16; 46) has a two-part design and is mounted in the transmission housing with mutually different axes of rotation, an annular gear stage (20) is functionally provided between the sub-shafts (14a, 14b; 16a, 16b; 46a, 46b) and comprises a internally-toothed annular gear (20a) and an externally-toothed spur gear (20b) that meshes therewith, the sub-shaft (14b; 16b; 46b) which has the larger axial distance (a1) to the other shaft (16; 14; 44) bearing gearwheels of the lower forward gears (1, 2) and, optionally, of the reverse gear (R).

The invention discloses an air compressor for a fuel cell. The air compressor comprises a motor and an air compressor body. The motor comprises a casing with two open ends, end covers arranged at the two ends of the casing, a motor shaft with two ends in running fit connection with the corresponding end covers and penetrating out of the corresponding end covers, and a stator arranged in the casing and surrounding the motor shaft; the air compressor body comprises an air compressor shell internally provided with a cavity, a low-pressure-stage air compressor wheel close to an air inlet and a high-pressure-stage air compressor wheel; one end of the air compressor shell is fixed to the first end cover, the air inlet is formed at the other end of the air compressor shell, a tangential air outlet is formed in the air compressor shell, and the air inlet and the tangential air outlet are both communicated with the cavity; the two air compressor wheels are arranged on the motor shaft extending into the cavity in series; and a fluid director is arranged in the cavity between the two stages of air compressor wheels, and the two air compressor wheels and the fluid director divide the cavity into a circuitous airflow channel. Under the condition that the compact structure is guaranteed, the air compression efficiency and the output pressure are improved, and the overall reliability of the air compressor is effectively guaranteed.

The invention relates to a vaporizing arrangement. It preferably should be utilized in vacuum coating systems. The vaporizing arrangement comprises a two-part housing, namely a pan ( 3 ) and an associated lid ( 8 ), which is provided with the exit slot ( 16 ) for the material to be vaporized. Extending transversely above the pan ( 3 ) are several heating rods ( 5 ) which can be contacted on the outside and the radiant output of which heats the material to be vaporized, for example zinc sulfide, and causes it to vaporize. The arrangement is relatively simply constructed, can be easily disassembled, cleaned, and reassembled and can, if several arrangements of this type are combined, also be used for the uniform coating of very wide films.

The invention belongs to the technical field of compressors, and particularly relates to a two-stage compression water-cooling air compressor. The two-stage compression water-cooling air compressor comprises a compressor shell and a compressor body. The compressor body comprises a pneumatic system, a cooling system and an electronic control system. The pneumatic system comprises a high pressure cylinder, a low pressure cylinder, an engine oil cylinder and a filter. The output end of a motor is connected with one side of a crankcase. The high pressure cylinder and the low pressure cylinder are correspondingly connected with the crankcase and are further arranged in a V shape relative to the crankcase. The other side of the crankcase is connected with the engine oil cylinder. According to the two-stage compression water-cooling air compressor, traditional three-stage compression or four-stage compression is simplified into two-stage compression, the number of parts is decreased and the failure rate is lowered. By assisting in a forceful water-cooling system, the high temperature problem of a compression cylinder is solved, the technical requirements for core materials and parts are lowered, localized production is realized and cost is greatly reduced.

The invention belongs to the technical field of compressors, and particularly relates to a two-stage compression water-cooling air compressor. The two-stage compression water-cooling air compressor comprises a compressor shell and a compressor body. The compressor body comprises a pneumatic system, a cooling system and an electronic control system. The pneumatic system comprises a high pressure cylinder, a low pressure cylinder, an engine oil cylinder and a filter. The output end of a motor is connected with one side of a crankcase. The high pressure cylinder and the low pressure cylinder are correspondingly connected with the crankcase and are further arranged in a V shape relative to the crankcase. The other side of the crankcase is connected with the engine oil cylinder. According to the two-stage compression water-cooling air compressor, traditional three-stage compression or four-stage compression is simplified into two-stage compression, the number of parts is decreased and the failure rate is lowered. By assisting in a forceful water-cooling system, the high temperature problem of a compression cylinder is solved, the technical requirements for core materials and parts are lowered, localized production is realized and cost is greatly reduced.

The invention discloses a carbon fiber composite lead wire core, a preparation method thereof and a lead wire comprising same. The carbon fiber composite lead wire core comprises an aluminum alloy cylinder and carbon fibers which are uniformly distributed in the aluminum alloy cylinder and provided with silica coating. The lead wire core obtained in the invention is high in strength, has the tensile strength higher than that of a common steel core by about one time and higher than that of a high-strength steel core by 40%, is low in line loss and high in conductivity, has no magnetic loss thermal effect caused by a steel wire material, and has lower operating temperature under the condition of conveying the same load to reduce power transmission loss by about 6%, is small in sag, has significant low sag characteristics compared with a conventional lead wire, and high allowable working temperature, is high in current-carrying capacity, has the aluminum product section of the lead wire with the carbon fiber core being 1.29 times that of a conventional ACSR (Aluminum Conductor Steel Reinforced) under the condition of same quality, is light in weight, has the density of the carbon fibers and the aluminum alloy being 1.8 g / cubic centimeter and 2.7 g / cubic centimeter respectively, and corrosion resistant, with long service life.

The invention relates to a transmission for a motor vehicle, in particular a shifting transmission, having a plurality of forward gears and possibly a reverse gear, the transmission having at least an input shaft and an output shaft and possibly a countershaft, between which is arranged a The fixed gear of the range gear set and the floating gear that can be shifted by the synchromesh. The invention proposes that at least one of the shafts (14; 16; 46) be two-part and mounted in the transmission housing with mutually different rotational axes offset relative to one another by an axis offset (Δv), on the sub-shafts. A ring gear stage (20) is operatively arranged between (14a, 14b; 16a, 16b; 46a, 46b), the ring gear stage having an internally toothed ring gear (20a) and a belt meshing with the ring gear Externally toothed spur gear (20b), wherein the sub-shaft (14b; 16b; 46b) with a greater axial distance (a1) from the other shafts (16; 14; 44) supports in particular the lower forward gears (1, 1, 4) 2) and a possible reverse (R) gear.

The invention discloses a direct type high-efficiency and low-loss transmission assembly. It includes an assembly plate, a transmission shaft arranged on the assembly plate, and an input coupling transmitter and an output coupling transmitter respectively connected to the transmission shaft, and the output coupling transmitter is a transmission shaft connected to the corresponding output A universal joint coupling transmitter between the shafts, the input coupling transmitter is a universal joint coupling transmitter connected between the transmission shaft and the input shaft. This direct-type high-efficiency and low-loss transmission assembly has no chain or few or no gears in its variable-direction coupling transmission, which can meet the needs to the greatest extent, and truly achieve a constant instantaneous transmission ratio. .

The arrangement has an electronic substrate (10) with a contact zone (50) arranged at a side of a connector (36). A matching section (54) in the substrate connects a microstrip line (48) to the zone for modifying direction of electromagnetic field between the line and zone, in parallel to direction of electric field in the connector. The connector may be a zero insertion force (ZIF) or low insertion force (LIF) connector. An Independent claim is also included for a portable radio-telephone.

The invention provides a spiral adjusting assembly on an electronic welding machine. The spiral adjusting assembly on the electronic welding machine comprises an upper-end connector, a lower-end connector and a screw. The structures of the upper-end connector and the lower-end connector are the same and the connectors are right-angle connecting blocks. One end of the screw is welded to the upper-end connector. The lower-end connector is provided with a screw hole matched with the screw. The screw is sleeved with the lower-end connector and the end of the screw is fixed through a nut. The upper-end connector and the lower-end connector are each provided with two protruding hexagonal installation holes. The spiral adjusting assembly on the electronic welding machine is simple in structure, convenient to install, good in connecting stability and not likely to fall. Particularly in a structure with large transmission, connecting capacity is good and transmission loss is avoided.

The invention discloses a direct type high-efficiency low-loss transmission assembly. The direct type high-efficiency low-loss transmission assembly comprises an assembly plate, a transmission shaft arranged on the assembly plate, an input coupling transmitter and an output coupling transmitter, and the input coupling transmitter and the output coupling transmitter are respectively connected withthe transmission shaft; and the output coupling transmitter is a universal joint coupling transmitter connected between the transmission shaft and a corresponding output shaft, and the input couplingtransmitter is a universal joint coupling transmitter connected between the transmission shaft and an input shaft. The direction-changing coupling transmission drive of the direct type high-efficiencylow-loss transmission assembly has no chain and few or no gears, the requirement can be met to the maximum extent, constant instantaneous transmission ratio is truly realized, and power transmissionis particularly stable, reliable and free of noise.

The invention discloses an anti-interference NAVTEX receiver system. The anti-interference NAVTEX receiver system comprises an orthogonal antenna sub-system and an information terminal sub-system; theorthogonal antenna sub-system is connected to the information terminal sub-system; the orthogonal antenna sub-system comprises an orthogonal directional magnetic field antenna unit, four digital-to-analogue conversion units, a digital intermediate-frequency processing unit and a serial port sending unit; and the information terminal sub-system comprises a serial port receiving unit, a baseband signal processing judgement unit and a display control unit, wherein the orthogonal antenna sub-system and the information terminal sub-system are connected through a serial port differential twisted pair. According to the anti-interference NAVTEX receiver system disclosed by the invention, effective signals from a space are simultaneously received by adoption of orthogonal directional antennas, which are vertical to each other; interference receiving can be weakened; therefore, the receiving signal to noise ratio is increased; the receiving sensitivity is improved; the twisted pair is used fortransmitting baseband low-speed digital signals, and has the advantages of being long in transmission distance, free from transmission loss, high in anti-interference capability, low in cost and the like; flexible wiring can be realized; and environmental interference on the receiver system can be avoided to the most extent.

The invention provides a television capable of supporting multiple digital television standards, wherein a central processing device transmits a passage selection signal and channel selection signals according to a current working state of the television; a first receiving device receives RF (Radio Frequency) signals of a first standard, and obtains an RF signal of a corresponding channel in the RF signals of the first standard according to a first channel selection signal and converts the RF signal into a first intermediate frequency signal; a first demodulation device demodulates the first intermediate frequency signal into a first transport stream signal; a second receiving device receives RF signals of a second standard, and obtains an RF signal of a corresponding channel in the RF signals of the second standard according to a second channel selection signal and converts the RF signal into a second intermediate frequency signal; a second demodulation device demodulates the second intermediate frequency signal into a second transport stream signal; a first switching device receives the transport stream signals according to the passage selection signal; a decoding device receives and decodes the transport stream signals and then outputs the decoded signals; a display device receives and displays the decoded signal; and an image treatment device connected between the decoding device and the display device is used for performing image enhancement treatment or scaling treatment to the decoding signals.

The invention provides an electromagnetic inserting piece type concrete vibrator which comprises a horseshoe-shaped iron core and an excitation coil wound on the horseshoe-shaped iron core. The two magnetic poles of the horseshoe-shaped iron core both extend downwards to form two silicon steel pieces, and the excitation coil is electrically connected with an alternating-current power supply. The vibrator is free of work noise, low in cost, small in energy consumption, large in vibration action face and high in work efficiency.