31results about How to "Eliminate mechanical vibration" patented technology

The invention relates to an electric-driving transmission device for an electric vehicle and a control method. The electric-driving transmission device comprises a driving motor, a differential mechanism, a first brake, a second brake, a first planetary gear set and a second planetary gear set, wherein the first planetary gear set comprises a first sun wheel, a first planet carrier and a first gear ring, and the second planetary gear set comprises a second sun wheel, a second planet carrier and a second gear ring. An output shaft of a driving motor is sequentially connected with the first sunwheel and the second sun wheel. The first gear ring is connected with the first brake, and the second gear ring is connected with the second brake. The first planet carrier and the second gear ring are connected to form a whole, the second planet carrier is provided with an output support, and the output support is connected with an input shaft of the differential mechanism. Compared with the prior art, the electric-driving transmission device can achieve non power failure in the gear shifting process, is low in control complexity, has relatively low requirements for performance of the drivingmotor, and is high in practicability, compact in structure, small in size, low in weight and low in manufacturing cost.

The invention relates to a power system assembly of an electric vehicle. The power system assembly comprises a motor, a gearbox and a differential mechanism, wherein the motor and a transmission are integrally designed, and the transmission comprises a planet wheel mechanism and a duplex gear mechanism. The power system assembly disclosed by the invention effectively reduces the complexities and areas of a motor shell and a transmission shell, and reduces the axial size of the power assembly; the power system assembly is compact in structure, small in size and light in weight, and is consistent with a light weight principle of automobile. According to the power system assembly, a rotor shaft of the motor is directly connected to a central gear of the planet wheel mechanism in the transmission, so as to avoid coaxial tolerance caused by a motor output shaft and a transmission input shaft which are in matched installation, thereby eliminating the subsequent mechanical vibration and relieving the mechanical connection and noise. On the other hand, compared with an existing electric vehicle, the power system assembly which is in two-gear transmission ensures that the motor can work in an efficient area for a long time, thus prolonging the driving range of the vehicle.

The invention provides an aeromagnetic survey device based on a low-temperature superconductive SQUID. The aeromagnetic survey device comprises a data acquisition device, a power supply unit, a non-magnetic auxiliary system support, a Faraday cage, a reading circuit and attitude measurement module, a low-temperature superconductive SQUID sensor unit, a non-magnetic Dewar fixation barrel, a vibration absorption material, a non-magnetic device bottom support plate and vibration absorption components. The non-magnetic auxiliary system support and the non-magnetic Dewar fixation barrel are fixed to the non-magnetic device bottom support plate; the low-temperature superconductive SQUID sensor unit is arranged in the non-magnetic Dewar fixation barrel, and the vibration absorption material is filled between the low-temperature superconductive SQUID sensor unit and the non-magnetic Dewar fixation barrel; and the Faraday cage wraps the whole survey device. The aeromagnetic survey device based on the low-temperature superconductive SQUID can improve anti-interference capability of a low-temperature superconductive SQUID system on complicated electromagnetic environment outside a test field, thereby reducing high and low frequency mechanical vibration generated in the aeromagnetic survey process.

A dynamically adjusting surveillance system provides a monitor, a sequence of views that include a key view. The sequence of views is captured by a camera. The monitor can display a portion of the camera view. The system is configured such that the displayed portion of the camera view includes the key view to a driver of the vehicle. The key view can be selected to be a rearward view when the vehicle is not turning, and a view of cross traffic from a side opposite which a turn is made at an intersection.

The invention provides an integrated two-speed transmission electric drive assembly system and an application method. The integrated two-speed transmission electric drive assembly system comprises a driving motor, a first brake, a second brake, a double-row planetary gear mechanism and a final reduction drive and differential assembly, wherein the output shaft of the driving motor is connected toa front-row planetary carrier through a spline; a front-row ring gear and a rear-row ring gear are integrated into one; a rear-row sun gear is connected to the front-row planetary carrier; steel plateassemblies of the first brake and the second brake are engaged with a gearbox body; a friction plate assembly of the first brake is engaged with an outer ring gear; the friction plate assembly of thesecond brake is engaged with the extension end of a front-row sun gear; and the output end of a rear-row planetary carrier is connected to the input shaft of the final reduction drive and differential assembly and outputs power to wheels. The integrated two-speed transmission electric drive assembly system decreases the axial dimension of a powertrain and decreases the mechanical noise while reducing the difficulty of the arrangement of a whole vehicle. The integrated two-speed transmission electric drive assembly system is compact in whole structure, small in size and light in weight. The design of two-speed transmission enables a motor to work in an efficient range for a long time so as to improve the power performance and economy of the whole vehicle.

A dynamic microphone unit includes: a diaphragm that vibrates in response to received sound waves; a voice coil that is fixed to the diaphragm and vibrates together with the diaphragm; a magnetic circuit that generates a magnetic field in a magnetic gap, the voice coil being disposed in the magnetic gap; a resonator that is disposed adjacent to the obverse of the diaphragm; and a noise canceling coil that is fixed to a surface of the resonator so as to face a position of fixing the voice coil, the surface facing the diaphragm. The noise canceling coil is connected in series with the voice coil and has a winding direction different from that of the voice coil.

The invention relates to the technical field of electrical engineering, and discloses a welding device for electrical engineering. The welding device comprises a supporting plate. Supporting rods are fixedly connected to the bottom of the supporting plate, frames are fixedly connected to the bottom of the supporting plate, and a balancing weight is fixedly connected to the tops of the frames. A silicone rubber pad is arranged at the top of the supporting plate, clamping mechanisms are fixedly installed at the top of the supporting plate, and portal frames are fixedly connected to the top of the supporting plate. Electric push rods are fixedly connected to the inner top walls of the portal frames, a supporting mechanism is fixedly installed at the output ends of the electric push rods, and the supporting mechanism comprises a cross beam. Through the arrangement of the portal frames, the electric push rods and limiting mechanisms, the cross beam can be pushed or pulled up more quickly. Meanwhile, through the arrangement of the two portal frames, the electric push rods and the limiting mechanisms, the situation that the cross beam inclines due to the self-weight of the cross beam during welding work can be avoided, and use is safe and reliable.

The invention provides a feeding device and method with automatically-adjusted feeding amount. The feeding device is installed above a mold conveying rail of a prefabricated plate production line, thefeeding device comprises a machine frame, a material bin, a hopper, a load device, a rotary feeding valve and a controller, wherein the material bin, the hopper and the rotary feeding valve are in sequential communication from top to bottom, the load device is arranged on the machine frame, the material bin, the hopper, the rotary feeding valve and a built-in thick-liquid material weight are allapplied to a load end of the load device, and a data interface of the load device is electrically connected to the controller. According to the feeding device, the feeding amount in one feeding periodmonitored online by the load device is acquired by the controller, the rotating speed of an impeller of the rotary feeding valve is adjusted online, so that the purpose of automatically adjusting thefeeding amount is achieved; an on-line sliding filter can eliminate field mechanical vibration interference and pulse interference, so that the precision of feeding amount detection is improved, andthe on-line monitoring real-time performance requirement is met; and the device is compact in structure and high in automation degree, and the working efficiency and the product quality can be improved.

The invention relates to a dual-planetary-gear transmission for an electric vehicle. The dual-planetary-gear transmission comprises a driving motor, a differential mechanism, a first brake, a second brake, a first planetary gear set and a second planetary gear set; the first planetary gear set comprises a first sun gear, a first planetary frame and a first gear ring; the second planetary gear setcomprises a second sun gear, a second planetary frame and a second gear ring; and an output shaft of the driving motor is connected with the first sun gear and the second gear ring, the first gear ring is connected with the first brake, the second sun gear is connected with the second brake, the first planetary frame and the second planetary frame are connected to form a whole, the first planetaryframe is provided with an output bracket, and the output bracket is connected with an input shaft of the differential mechanism. Compared with the prior art, according to the dual-planetary-gear transmission, power interruption in the gear shifting process can be avoided, the control complexity and the requirements for performance of the driving motor are low, and practicality is high.

The invention discloses large-scale POV-LED display equipment and a solution for dynamic balance in the display process. The large-scale POV-LED display equipment comprises one or more odd-numbered abnormal-typed rotary arm which is connected to a rotary arm fixed disk. The large-scale POV-LED display equipment is characterized by further comprising a counter weight end cover, wherein the counter weight end cover is arranged on the end surface of one end, away from the rotary arm fixed disk, of the abnormal-typed rotary arm. A hollow motor group is installed on the end surface of the rear end of the rotary arm fixed disk; the rear end of the hollow motor group is provided with a sliding ring; the rotary arm fixed disk is coincidence with the circle centers of the hollow motor group and the sliding ring. An end cover is designed at the outer end of the abnormal-typed rotary arm; fine tuning is conducted on the weight of the rotary arm individual by separate counterweight, and the overall dynamic balance of the large-sized rotary arm is improved to enhance the stability. The hollow motor group is installed to output kinetic energy, the drive torque is larger, the shortcoming that the stability of direct drive motor single shaft output is not strong is solved, and the better image stability is provided for large-scale suspension transparent display equipment.

A ribbon-type electroacoustic transducer with improved electrical, electromechanical, electromagnetic characteristics is described.

A dynamically adjusting surveillance system provides a monitor on one or both sides of a vehicle, each monitor including one or more cameras capturing an image that includes a key region. The monitors can display this key region to a driver of the vehicle. The key region can be updated based on the activities of the driver. For example, the key region can change to provide a desirable view for the driver before, during and after a turn is made. An angular sensor can be used to detect the position of the vehicle in the turn to dynamically update the key region displayed to the driver. The key region can be changed at a sufficient frequency so that a gradual and smooth view is provided to the driver during the turn.

The invention discloses a teaching-used automobile intake manifold absolute pressure sensor teaching and training device, which comprises a training table and a base, wherein the top part of the training table is provided with an open source single chip microcomputer, a supporting device and a prompting device; a vacuum pumping device is arranged on the supporting device; and the vacuum pumping device is connected with the intake manifold through a connection mechanism. According to the teaching-used automobile intake manifold absolute pressure sensor teaching and training device disclosed inthe invention, an electric lifting rod is controlled to work through the open source single chip microcomputer, the telescopic end of the electric lifting rod drives a mounting seat to perform liftingmovement, and the display height of the training table is thus adjusted; a servo motor is controlled to work through the open source single chip microcomputer, the output shaft of the servo motor drives the training table to rotate through a connection seat, and the display angle of the training table is further adjusted; and the flexibility is good, the adjustment is convenient, and teaching work is facilitated.

The invention discloses a friction driving type brake disc flatness detection mechanism. The detection mechanism comprises belt pulley bearers, belt pulleys, a synchronous belt, a surface elastomer of the synchronous belt, a column, a sliding sleeve seat, a fastening screw of the sliding sleeve seat, a laser displacement sensor, a crossbeam, a sensor fastening screw, a measuring pedestal, a cylindrical guide rail, a pedestal of the cylindrical guide rail and the like. When the mechanism starts working, a feeding end pushes an input brake disc to a specific position on the synchronous belt pulleys via the cylindrical guide rail; with rotation of a synchronous belt mechanism, the surface elastomer of the synchronous belt is transmitted to a position under the brake disc; in the position, the elastomer is extruded between the belt pulley and the brake disc, and friction is generated between the elastomer and the brake disc; the belt rotates continuously, and the brake disc generates servo-slide on the cylindrical guide rail via the friction; and when the brake disk moves to a measurement position, the laser displacement sensor completes data collection and dynamic measurement for the flatness of the brake disc.

The invention provides a compression-type compact busduct shell assembly. The compression-type compact busduct shell assembly comprises cover plates and side plates, which are spliced into a II shape, wherein the cover plates are located at the upper side and the lower side; the side plates are located at the left side and the right side; a conductor accommodating cavity for placing conductors is formed in the middle parts of the cover plates at two sides and the side plates; the upper end and the lower end of the conductor accommodating cavity are clamped with hollow rectangular support pipes; first bolt holes which are correspondingly connected from left to right are formed in the contact parts of the support pipes and the side plates; long bolts are screwed into the first screw bolt holes; long nuts are connected with the tail parts of the long bolts; second bolt holes which are correspondingly connected from top to bottom are formed in the contact parts of the cover plates and the side plates; short bolts are screwed into the second screw bolt holes; and square nuts are connected with the tail parts of the short bolts. The compression-type compact busduct shell assembly has the beneficial effects of being simple and convenient to install and safe to use; the conductors can be completely compressed; mechanical vibration of the conductors caused by electrical force is eliminated; odd harmonics in the electrical transmission process are eliminated; the power supply quality is improved; the temperature rise can be effectively reduced; and the service lifetime is prolonged.

The invention discloses an aluminum coil pipe production method. The aluminum coil pipe production method comprises the following steps that melting and casting of an aluminum rod is carried out, andspecifically molten aluminum is injected into a mold cavity for pilot injection molding; hot peeling is carried out, wherein the aluminum rod subjected to pilot injection molding is heated to remove the surface parts with many impurities and poor performance of the aluminum rod; extrusion is carried out, wherein the aluminum rod is placed into an isothermal extrusion mold, and a twisting closing section working belt is added in front of a welding-closing cavity for extrusion; and cold drawing is carried out, and specifically cold-drawing processing is carried out by using a moving core head and a hard alloy mold. A large-processing-amount reducing-diameter wall-reducing mode is adopted by using the production method, so that the extrusion size tolerance and mechanical vibration during connection of the two aluminum rods are eliminated, and then the size and the wall thickness precision of a processed aluminum coil pipe can reach + / -0.03 mm.

The invention discloses a convenient-to-assemble efficient heat-dissipating bus duct, which comprises two groups of shells, wherein the two groups of shells are bilaterally symmetrically arranged; adjustment mechanisms are arranged at the end parts of the shells; two groups of adjustment mechanisms are connected through a first clamping mechanism; and the first clamping mechanism is fixed througha locking mechanism. According to the convenient-to-assemble efficient heat-dissipating bus duct, the mounting freedom of the shells is adjusted through the adjustment mechanisms, so that the convenient-to-assemble efficient heat-dissipating bus duct is good in flexibility and convenient to meet different mounting requirements, can meet different temperature drops and the telescoping requirement caused by thermal expansion and cold contraction and also can compensate an error caused by foundation settlement; two groups of shells are assembled through the first clamping mechanism, so that the convenient-to-assemble efficient heat-dissipating bus duct is convenient to mount and remove and the assembly efficiency is greatly improved; and the first clamping mechanism is fixed through the locking mechanism, so that connection positions of two groups of bus ducts are prevented from being loosened and the use safety of the bus duct is ensured.

The invention provides a power system assembly for two-speed electric vehicles. The power system assembly for two-speed electric vehicles comprises an electromotor, a single-row planetary gear train, a synchronizer, a single reduction final drive, a compensating gear, a magnet brake and a housing, wherein the stator of the electromotor is fixed inside the housing; a rotor is connected with one side of a rotor shaft; the other side of the rotor shaft is arranged inside the housing in a penetrating manner through a bearing; the single-row planetary gear train comprises a central gear, a planet carrier and more than two planetary gears; the single reduction final drive comprises a small main reducing gear and a big main reducing gear which are meshed with each other; the synchronizer comprises a first gear synchronous lock ring, a second gear synchronous lock ring, a meshing sleeve and a meshing sleeve seat. According to the invention, the technology of integrated structural design is adopted, so that the highly integrated design and the application of the motor, the transmission and the compensating gear is realized; the integration of the electrically-driven system becomes more obvious; the volume and the weight of the electrically-driven system are effectively reduced; the mounting is enabled to be more convenient; the two-gear speed change is adopted, so that the efficiency and the torque of the electromotor are improved.

The invention provides a towel loom with an automatic fuzzing control device. According to a towel rapier loom, an angle sensor is mounted on a main transmission shaft and is connected with a single chip microcomputer through a wire; the port of the single chip microcomputer is connected in series with a motor driving thick-film module and a switch reluctance motor; the switch reluctance motor is connected with a wefting device of the towel rapier loom through a speed reducer. Due to the arrangement, the towel rapier loom can be automatically controlled during towel fuzzing operation to realize self-locking, so that the fuzzing length of a towel can be uniform and consistent, and the stable operation efficiency of equipment can be correspondingly improved.

The invention discloses an atomic clock frequency discrimination signal detection system. The detection system includes: an atomic clock control circuit system, a first optical system, a physical system, a second optical system, and a microwave pulse synthesizer; the first optical system generates linearly polarized light; The physical system generates a frequency discrimination signal according to the double microwave pulse signal, which is used to realize the closed-loop locking of the atomic clock frequency and rotate the polarization direction of the linearly polarized light; the second optical system uses photoelastic modulation technology to determine the probe light that is rotated after passing through the physical system The component in the vertical direction; the atomic clock control circuit system uses the cross-correlation detection technology to determine the error voltage signal of the atomic clock frequency closed-loop locking according to the component of the detection light in the vertical direction; the microwave pulse synthesizer generates a 6.8GHz double microwave pulse signal according to the error voltage signal . The invention combines photoelastic modulation technology and cross-correlation detection technology to improve the signal-to-noise ratio and frequency stability of the atomic clock frequency discrimination signal.

The invention discloses a self-suction type X-ray generating device and application thereof. The device comprises an insulating shell, a cathode, an anode, a grid, at least one adsorption metal plateand at least one sputtering metal plate, the cathode is packaged in the insulating shell and is used for releasing electrons; the anode is packaged in the insulating shell, the anode comprises a target body and a target surface, and electrons released by the cathode collide with the target surface to release X-rays; the at least one adsorption metal plate and the at least one sputtering metal plate are arranged in parallel, each adsorption metal plate and the sputtering metal plate adjacent to the adsorption metal plate form one group of ion sputtering structures, there is at least one group of the ion sputtering structures, the at least one group of the ion sputtering structures are located at the at least one side of the cathode, and the plane directions of the at least one adsorption metal plate and the at least one sputtering metal plate are parallel to the electron release direction of the cathode; and the gate may be disposed on the at least one adsorption metal plate or the at least one sputtering metal plate or disposed separately. By introducing the ion sputtering structures, residual gas molecules in the X-ray tube are adsorbed while the X-ray tube emits, and a better vacuum degree is obtained.

The invention discloses a friction driving type brake disc flatness detection mechanism. The detection mechanism comprises belt pulley bearers, belt pulleys, a synchronous belt, a surface elastomer of the synchronous belt, a column, a sliding sleeve seat, a fastening screw of the sliding sleeve seat, a laser displacement sensor, a crossbeam, a sensor fastening screw, a measuring pedestal, a cylindrical guide rail, a pedestal of the cylindrical guide rail and the like. When the mechanism starts working, a feeding end pushes an input brake disc to a specific position on the synchronous belt pulleys via the cylindrical guide rail; with rotation of a synchronous belt mechanism, the surface elastomer of the synchronous belt is transmitted to a position under the brake disc; in the position, the elastomer is extruded between the belt pulley and the brake disc, and friction is generated between the elastomer and the brake disc; the belt rotates continuously, and the brake disc generates servo-slide on the cylindrical guide rail via the friction; and when the brake disk moves to a measurement position, the laser displacement sensor completes data collection and dynamic measurement for the flatness of the brake disc.

The invention discloses an atomic clock frequency discrimination signal detection system. The detection system comprises an atomic clock control circuit system, a first optical system, a physical system, a second optical system and a microwave pulse synthesizer, the first optical system generates linearly polarized light; the physical system generates a frequency discrimination signal according tothe double-microwave pulse signal, and is used for realizing closed-loop locking of atomic clock frequency and rotating the polarization direction of linearly polarized light; the second optical system determines the component of the detection light which rotates after passing through the physical system in the vertical direction by using a photoelastic modulation technology; the atomic clock control circuit system determines an error voltage signal of atomic clock frequency closed-loop locking according to the component of the detection light in the vertical direction by using a cross-correlation detection technology; and the microwave pulse synthesizer generates a 6.8 GHz double-microwave pulse signal according to the error voltage signal. According to the invention, the photoelastic modulation technology and the cross-correlation detection technology are combined to improve the signal-to-noise ratio and the frequency stability of the atomic clock frequency discrimination signal.

The invention provides an integrated two-speed transmission electric drive assembly system and an application method. The integrated two-speed transmission electric drive assembly system comprises a driving motor, a first brake, a second brake, a double-row planetary gear mechanism and a final reduction drive and differential assembly, wherein the output shaft of the driving motor is connected toa front-row planetary carrier through a spline; a front-row ring gear and a rear-row ring gear are integrated into one; a rear-row sun gear is connected to the front-row planetary carrier; steel plateassemblies of the first brake and the second brake are engaged with a gearbox body; a friction plate assembly of the first brake is engaged with an outer ring gear; the friction plate assembly of thesecond brake is engaged with the extension end of a front-row sun gear; and the output end of a rear-row planetary carrier is connected to the input shaft of the final reduction drive and differential assembly and outputs power to wheels. The integrated two-speed transmission electric drive assembly system decreases the axial dimension of a powertrain and decreases the mechanical noise while reducing the difficulty of the arrangement of a whole vehicle. The integrated two-speed transmission electric drive assembly system is compact in whole structure, small in size and light in weight. The design of two-speed transmission enables a motor to work in an efficient range for a long time so as to improve the power performance and economy of the whole vehicle.

The invention discloses a high vacuum low temperature thermostat using low heat leakage flexible connection structure, including refrigerator fixing flange whose outside is fixed with extine of the top by bolted construction and inside is melted and fixed by bellows, in thermostat, vacuum jacket, upper heat sink, lower heat sink and flexible connection structure are installed under the refrigerator fixing flange. Its advantage include: vacuum jacket has property of low heat leakage by using folding bush and other types; stainless steel bellows in fixed structure can eliminate mechanical vibration caused by low temperature refrigerator operation; mechanical yaw between agent of refrigerator and cooled substance is allowed by flexible connection structure; additional indium slice between agent of refrigerator and heat sink, heat sink and cooled substance can decrease thermal contact resistance between connecting fitting and effective refrigerating capacity loss.

The invention relates to a power system assembly of an electric vehicle. The power system assembly comprises a motor, a gearbox and a differential mechanism, wherein the motor and a transmission are integrally designed, and the transmission comprises a planet wheel mechanism and a duplex gear mechanism. The power system assembly disclosed by the invention effectively reduces the complexities and areas of a motor shell and a transmission shell, and reduces the axial size of the power assembly; the power system assembly is compact in structure, small in size and light in weight, and is consistent with a light weight principle of automobile. According to the power system assembly, a rotor shaft of the motor is directly connected to a central gear of the planet wheel mechanism in the transmission, so as to avoid coaxial tolerance caused by a motor output shaft and a transmission input shaft which are in matched installation, thereby eliminating the subsequent mechanical vibration and relieving the mechanical connection and noise. On the other hand, compared with an existing electric vehicle, the power system assembly which is in two-gear transmission ensures that the motor can work in an efficient area for a long time, thus prolonging the driving range of the vehicle.

The invention discloses a multi-path switching value parallel transmission system and method based on optical fibers. The transmission system comprises a sending unit, a distribution unit and M receiving units. The transmitting unit comprises n optical transmitters, each optical transmitter corresponds to one signal source, and the n optical transmitters transmit laser signals with different frequencies, which are transmitted by each signal source, into one optical fiber coupler through optical fibers connected with the n optical transmitters for coupling; wherein the optical fiber coupler inthe sending unit is in communication connection with the optical fiber coupler in the distribution unit through an optical fiber, the distribution unit distributes laser signals to different receivingunits through the optical fiber coupler, and each receiving unit comprises the laser signals sent by each signal source; the receiving unit comprises an optical wavelength division multiplexer, and the optical wavelength division multiplexer is in communication connection with the n photoelectric switches through n optical fibers. According to the transmission system, the problems of relay fault,signal transmission interference and incapability of self-checking caused by controlling the switching value through a relay in the prior art are solved.

A dynamic microphone unit includes: a diaphragm that vibrates in response to received sound waves; a voice coil that is fixed to the diaphragm and vibrates together with the diaphragm; a magnetic circuit that generates a magnetic field in a magnetic gap, the voice coil being disposed in the magnetic gap; a resonator that is disposed adjacent to the obverse of the diaphragm; and a noise canceling coil that is fixed to a surface of the resonator so as to face a position of fixing the voice coil, the surface facing the diaphragm. The noise canceling coil is connected in series with the voice coil and has a winding direction different from that of the voice coil.

The invention discloses large-scale POV-LED display equipment and a solution for dynamic balance in the display process. The large-scale POV-LED display equipment comprises one or more odd-numbered abnormal-typed rotary arm which is connected to a rotary arm fixed disk. The large-scale POV-LED display equipment is characterized by further comprising a counter weight end cover, wherein the counter weight end cover is arranged on the end surface of one end, away from the rotary arm fixed disk, of the abnormal-typed rotary arm. A hollow motor group is installed on the end surface of the rear end of the rotary arm fixed disk; the rear end of the hollow motor group is provided with a sliding ring; the rotary arm fixed disk is coincidence with the circle centers of the hollow motor group and the sliding ring. An end cover is designed at the outer end of the abnormal-typed rotary arm; fine tuning is conducted on the weight of the rotary arm individual by separate counterweight, and the overall dynamic balance of the large-sized rotary arm is improved to enhance the stability. The hollow motor group is installed to output kinetic energy, the drive torque is larger, the shortcoming that the stability of direct drive motor single shaft output is not strong is solved, and the better image stability is provided for large-scale suspension transparent display equipment.