114results about How to "Simplify the drivetrain" patented technology

The invention provides an electric tractor. The electric tractor comprises a battery pack (10), an energy management system (12), a main controller (8), a motor controller I (4), a motor I (3), a speed reducer I (2), a power output shaft (1), a motor controller II (7), a motor II (5) and a speed reducer II (6). The main controller is used for receiving a motion signal and a working signal of a vehicle and transmitting a control instruction to the motor controller I and the motor controller II so as to carry out corresponding adjustments, like starting, accelerating, braking and the like on the motor I and the motor II; output torques of the motor I and the motor II are respectively used for driving the power output shaft and wheels by the speed reducer I and the speed reducer II so as to achieve multi-motor independent control. According to the invention, steering, downhill and braking energy can be recycled by using electric brake; requirements on different farmland operations, like rotary tillage, ploughing, transportation and the like can be satisfied; and the electric tractor provided by the invention has the advantages of light weight, flexibility, higher energy conversion rate, no waste gas emission and the like.

The present invention discloses a flat-belt driven disc separator, comprising a power part, a driving part, a lubrication system, a working part, a machine part and a control and assisting part. In addition to that the requirements of the function and performance of the separator is satisfied, the driving system is largely simplified, the driving path is brief, the quantity of driving components is largely reduced and the technical requirement of processing is lowered; regular replacement of expensive copper gear wheel, friction drum and other wearing parts is avoided, and as a result, the structure of the complete machine is simplified, the cost of production and use is reduced, the failure rate of the machine is lowered, and the technical performance of the complete machine is improved. The invention can be directly applied to condensing separation of natural rubber, and the invention can also be applied to separating other emulsions; the rotary-drum structure of the invention can overcome the disadvantages of the prior art; the continuous operation time is prolonged and the rotary-drum heating is alleviated; the strength, safety, reliability and maintenance technique are improved. The driving part and the lower machine body can form the driving of a manual slag-discharge separator, a gushing slag-discharge separator and a ring-valve slag-discharge separator and the lower machine body.

The invention discloses a terminal actuator for picking tomato fruit clusters and a picking method thereof. The terminal actuator for picking the tomato fruit clusters comprises a support, a clamping stepping motor, a fixed clamping arm, an ultrasonic distance measuring sensor, a cam serrated blade knife, a cutting stepping motor, a movable clamping arm, a gear rack, and a controller. A clamping mechanism composed of the fixed clamping arm and the movable clamping arm clamps main fruit stems of the tomato fruit clusters, and the ultrasonic distance measuring sensor conducts distance measuring and controls a clamping gap so as to control clamping force. The rotary cam serrated blade knife mounted on the fixed clamping arm cuts off the main fruit stems, so that separation of the fruit clusters and plants is achieved, picking of one cluster of the fruits can be completed in one picking process, therefore the picking productivity is improved greatly, and products also meet the requirements of consumers. Clamping and fruit stem cutting off operating parts are not in contact with the fruits, so that damages to the fruits and the plants is avoided. The whole terminal actuator is compact in structure, easy and convenient to operate, and reliable in working.

The invention relates to an axial-feeding type rice and wheat threshing and separating integrated device which comprises a feed head (1), a longitudinal axial-flow threshing and separating drum (2), a threshing gridded cover plate (3) and a separating concave grate (4). The feed head (1) is arranged at the front end of the longitudinal axial-flow threshing and separating drum (2), the threshing gridded cover plate (3) is arranged on the upper side of the longitudinal axial-flow threshing and separating drum (2), the separating concave grate (4) is arranged on the lower side of the longitudinal axial-flow threshing and separating drum (2), and the threshing gridded cover plate (3) and the separating concave grate (4) encircle to form a barrel capable of accommodating the longitudinal axial-flow threshing and separating drum (2). The axial-feeding type rice and wheat threshing and separating integrated device can realize high-feed harvesting of rice or wheat, and is high in harvesting efficiency and high in threshing capacity. As the length of the longitudinal axial-flow drum is reduced effectively, straws smashed by smashing and throwing mechanism are smashed effectively and thrown uniformly, and then can be returned to fields directly after harvesting.

The invention discloses a single punch tablet press. The single punch tablet press comprises a frame and a tablet press mechanism arranged on the frame, wherein the tablet press mechanism consists of a middle die, a main pressure mechanism, a feed mechanism and a top flat mechanism; the main pressure mechanism consists of an upper punch and an upper punch transmission mechanism; the feed mechanism consists of a material box and a material box transmission mechanism; the top flat mechanism consists of a lower punch and a lower punch transmission mechanism; the middle die is provided with a vertical punch through hole, and the hole section of the punch through hole is the same as the punch surface of the upper punch or lower punch; the upper punch is arranged at the upper end opposite to a medium pressure through hole, and the lower punch coaxially extends into the medium pressure through hole; the material box is arranged at one side of the middle die, and the lower end face of the material box and the upper end face of the middle die are positioned on the same horizontal plane; the material box has a cylindrical structure which is communicated from top to bottom; and a feeding hopper is arranged above the material box. The single punch tablet press has the advantages of prolonging the service life of the die, along with simple transmission system, small vibration and noise, strong controllability and flexibility, energy conservation and environment friendliness.

The invention relates to a transverse arrangement type composite thrust high-speed helicopter. The helicopter comprises a helicopter body, wings symmetrically arranged on the two sides of the helicopter body, a tail wing arranged at the tail of the helicopter body, engines arranged at the ends of the two sides of the wings, transversely arranged rotor wings arranged above the engines and variablepitch propellers arranged at the positions, close to the direction of the tail wing, of the rears of the engines, wherein the tail wing comprises horizontal tails used for achieving effects of stabilizing pitching and vertical fins used for providing yaw direction motion, the axes of the variable pitch propellers are parallel to the axis of the helicopter body. The transverse arrangement type composite thrust high-speed helicopter sufficiently utilizes advancing blades of the rigid rotor wings at a high speed, and thus pneumatic interference among the rotor wings is reduced; the flying stability can be improved through V-shaped arrangement; the rotor wing / wing interference is effectively reduced by the rigid blade characteristic in the forward flying process, and the transverse distancebetween the two rotor wings sharply reduces the rigidness and the weight of the wings; and propellant blades are arranged below the rotor wings, a transmission system is simplified, and the helicopterbody space is saved.

The present invention relates to a new structure mode of power unit and drive unit and relates to the improvement of power unit and transmission system of electromobile. The present invention can raise the efficiency of the power unit and drive unit, reduce the weight of the power unit and drive unit and thus reduce the power consumption of the whole electromobile. The technological scheme is to use two drive motors to drive two front wheels separately via speed reducer and drive shaft. The structure is mainly used in electromobile.

The invention discloses a small pure electric vehicle-based control simulating device for an electric driver-training vehicle and aims at modifying the small pure electric vehicle into the electric driver-training vehicle. The device comprises a variable-speed control simulator (1), an auxiliary brake (2), a potentiometer type brake pedal position sensor (3), an electronic throttle (4), a clutch control simulator (5), a signal acquiring module (6), a motor rotating speed sensor (7) and a tilt sensor (8), wherein the variable-speed control simulator (1) is arranged at a gear selecting controller of an original small pure electric vehicle; the auxiliary brake (2) is arranged on the right side of a pedal space of an assistant driver seat; the electronic throttle (4) is an original pure electric vehicle device and comprises an accelerator pedal position sensor (4-1) and an accelerator pedal (4-2); the clutch control simulator (5) is arranged on the left side of the pedal space of a driver; the input end of the signal acquiring module (6) is connected with relevant sensors; the output end of the signal acquiring module (6) is connected with a motor controller (9).

The invention relates to a double-air-gap hybrid-excitation direct-drive switch-reluctance wind generator and a wind generator set system. The wind generator comprises a main shaft, a shell, a rotor, an outer stator and an inner stator. Each stator comprises an iron core, a winding and a permanent magnet; the rotor adopts a double-salient-pole structure and is positioned between the inner stator and the outer stator and linked with the main shaft; the outer stator and the rotor form a first work air gap; the rotor and the inner stator form a second work air gap; the outer stator and the inner stator are oppositely connected in series corresponding to synclastic windings; and a first work air gap magnetic circuit and a second work air gap magnetic circuit are connected in series. The wind generator set system comprises a hub, a power converter, a direct-current battery, an inverter and a load, a control system, an auxiliary power supply and the wind generator, wherein the main shaft of the wind generator is linked with the hub and connected with the power converter; and the direct-current battery is connected in parallel between the power converter and the inverter and the load. The volume and the weight of the generator can be greatly reduced, the cost is lowered, the transportation is facilitated and the efficiency of the generator set is improved.

An energy buffer drive apparatus alternates between a state wherein a vehicle is caused to travel while rotational energy of a heat engine is intermittently stored in a flywheel, and a state wherein the vehicle is caused to travel using only the stored energy. In a process where the flywheel speed is reduced by the vehicle traveling using the rotational energy of the flywheel alone, the point in time when the heat engine again begins to supplement rotational energy to the flywheel is determined from (1) a speed ratio e=N2 / N1 of the revolution speed N1 of the input shaft and the revolution speed N2 of the output shaft in the continuously variable transmission always being smaller than the maximum allowed speed ratio, and (2) the output power of the heat engine exceeding the demanded power for a power train when the heat engine starts supplying energy once more.

The invention provides an all-electric vehicle with an EMT (electric-drive mechanical transmission). The all-electric vehicle comprises a motor, an EMT, an EMT gearshift, a vehicle control unit, a motor controller, a battery management system, a storage battery, a high-voltage distribution box, an on-board charger, a vehicular direct-current charge socket, a vehicular alternating-current charge socket, a shift knob, an accelerator pedal and a brake pedal. The problem that maximum speed fails to be along with maximum climbing performance when single gear is set is solved, and a vehicle transmission system is also improved. The all-electric vehicle is simple and convenient to operate, vehicle weight is decreased, and cost is lowered.

The invention relates to a main driving device for a rapier loom. The main driving device comprises a motor rotor gear shaft, a motor stator, a beating-up gear, an opening gear, a beating-up transmission shaft and an opening shaft and is characterized in that the rotor part of the motor rotor gear shaft is inserted into the motor stator, and the transverse magnetic circuit of the rotor part of the motor rotor gear shaft is not consistent with the transverse magnetic circuit of the motor stator in length; the end part of the motor rotor gear shaft is coaxially provided with a hydraulic push device for driving the motor rotor gear shaft to horizontally move; and an axial gap is arranged on the beating-up gear. Through the design of the technical scheme, the switching of two working positions of the rapier loom and the rapid opening and stopping of the rapier loom are realized through controlling a permanent magnet motor, and the defects of pulsation, vibration, noises and the like of a driving system during low-speed switch are overcome. Meanwhile, the device cannot cause the influence of the axial electric magnetic force due to coil energization at the two working positions, and further the demand on hydraulic pressure power can be reduced. Meanwhile, the main driving device has a better energy saving effect compared with the driving of a reluctance motor.

The invention discloses an oil pumping unit system with multiple sections of steam injection packer parts. The oil pumping unit system comprises an oil pumping unit body, a steam injection thermal production oil pump and a packer assembly. The oil pumping unit body is connected with the steam injection thermal production oil pump through a traction system of the oil pumping unit body. The steam injection thermal production oil pump is connected with the packer assembly through a release sub. The packer assembly comprises the release sub, a first oil discharging pipe, a first side sealing spindle, a second oil discharging pipe, a second side sealing spindle, a third oil discharging pipe, a third side sealing spindle, a packer body, a one-way valve, a first spraying head, a second spraying head, a sealing ring, a fourth oil discharging pipe, a third side sealing spindle, a fifth oil discharging pipe, a fourth side sealing spindle, a third spraying head, a ventilation pipe, a cable inletguiding part and a side gas pipeline.

The invention discloses a floor type multi-rope oil extractor system. The system comprises an oil extractor main body, a gas injection thermal recovery oil extracting pump and a packer module; the oilextractor main body is connected with the gas injection thermal recovery oil extracting pump through a traction system thereof; the gas injection thermal recovery oil extracting pump is connected with the packer module through a hand-free joint; the oil extractor main body comprises a concrete foundation, a shifter guide rail, a rail clamper module, a control cabinet, a bracket, an adjustable balance counterweight, an upper platform, an upper guard combination, a power device, a brake, the traction system and an elevator; the traction system comprises a traction wheel, a steel wire rope, a movable pulley set and a steel wire rope joint; the steel rope is divided into an elevation steel wire rope and a balance steel wire rope; one end of the elevation steel wire rope is fixed on the traction wheel and bypassed through the traction wheel, and the other end is fixedly connected with the steel wire rope joint on the bracket through the elevator and the movable pulley on the elevator; andthe balance steel wire rope is opposite to the elevation steel wire rope, one end is fixed on the traction wheel and bypassed through the traction wheel, and the other end is fixedly connected with the steel wire rope joint on the bracket through the adjustable balance counterweight and the movable pulley on the adjustable balance counterweight.

The invention discloses an electric car wheel edge driving device. The electric car wheel edge driving device is characterized by comprising a motor and a wheel edge speed reduction device. The motor and the wheel edge speed reduction device are arranged inside a hub. The wheel edge speed reduction device comprises a sun wheel, a planet wheel, an inner gear ring and a planet carrier. The wheel edge speed reduction device is arranged inside a hub supporting piece. The inner gear ring is fixedly arranged inside the hub supporting piece. Due to the fact that the planet carrier is fixed to a steering knuckle, after a motor shaft drives the sun wheel to rotate, the hub supporting piece rotates along with the inner gear ring, and finally the hub supporting piece drives a wheel to rotate. According to the electric car wheel edge driving device, the motor and the wheel edge speed reduction device are integrated into the wheel, the axial size is decreased, and the space inside the wheel is sufficiently utilized, so that interference caused by the motor between a suspension and a steering mechanism during steering is lowered, the service life of a hub bearing is prolonged, and the car driving performance is optimized.

The invention relates to a hydraulic control system for a hydraulic drive cutting table and an elevator. The hydraulic control system comprises an engine, a hydraulic oil tank, a gear pump, a pressure sensor I, a pressure compensation valve I, a controller, a pressure sensor II, a pressure sensor III, a reverse valve I, a hydraulic motor I, the cutting table, the elevator, a hydraulic motor II, a reverse valve II, a pressure compensation valve II and an overflow valve, wherein intelligence of harvester operation is realized through oil path connection and under the control of the controller. The hydraulic control system simplifies a transmission system of a complete machine and improves the working efficiency of the machine.

The invention relates to a double-air-gap hybrid excitation direct drive switched reluctance wind power generator and a unit system thereof. The power generator comprises a main bearing, an inner stator, an outer stator and a rotor, wherein the inner stator uses a centering bearing for centering. The unit system comprises a vane hub, a power converter, a direct current battery, an inverter and load, a control system, an auxiliary power supply and the wind power generator. The vane hub is connected with the main bearing of the double-air-gap hybrid excitation switched reluctance wind power generator, a rotary disc of the rotor and the rotor, the double-air-gap hybrid excitation switched reluctance wind power generator is connected with the power converter, the direct current battery is connected among the power converter, the inverter and the load in parallel, and the direct current battery, the power converter and the auxiliary power supply are connected with the control system respectively. Motor power density is improved greatly, effective material utilization rata and motor power factors are improved greatly, and weight, cost, vibration and noise of the motor are reduced greatly.

The invention discloses an antenna, a transmission device and a switching mechanism. The switching mechanism comprises: a transmission piece; a position selecting unit which comprises a worm, a worm wheel and a driving gear, wherein the worm is rotatably arranged on the transmission part, the worm wheel is in transmission fit with the worm, and the driving gear synchronously rotates with the wormwheel; and a driving unit which is used for driving the transmission piece to reciprocate along a preset track. The switching mechanism can selectively drive the output shaft to rotate, and can adaptto the increase of the frequency band of the antenna without causing the complex transmission structure; according to the transmission device, the switching mechanism is adopted, power is provided foradjustment of the downward inclination angle, and a transmission system is simplified; and the antenna adopts the transmission device, a transmission system is simplified, the antenna can adapt to the increase of the frequency band of the antenna, and the reliability of the working performance of the multi-frequency antenna is improved.

The invention discloses a multi-mode power system for a dual-electric hybrid engine which includes an engine, an elastic damping disk, a first electric machine, a second electric machine, a first planetary row, a second planetary row, and a differential parallel-shaft gear transmission. The multi-mode power system includes an engine, an elastic damping disk, a first electric machine, a second electric machine, a first planetary row, a second planetary row, and a differential device. By selecting a clutch brake, the first motor brake and the second motor brake are closed and released, the engine is individually driven, the second motor is individually driven, and the engine and the second motor are jointly driven The combined driving mode of the engine and the first electric machine and thecombined driving mode of the engine and the first electric machine and the second electric machine are realized, and the rotor braking mode of the first electric machine and the second electric machine is realized when the engine is separately driven. The invention has the advantages of simple transmission system, full brake structure, strong fuel-saving and electricity-saving performance, long service life, small moment of inertia, strong power, high reliability and low cost, and is suitable for the hybrid power system of passenger vehicles.

The invention discloses a mixed type medium-speed permanent magnet wind generator which comprises a stator, an outer rotor and an inner rotor from the outside to inside in sequence; the stator comprises a stator iron core, a stator winding and a permanent magnet adhered to the inner surface of the stator iron core; the outer rotor comprises magnetic-conductive iron yokes and non-magnetic-conductive blocks filled among the magnetic-conductive iron yokes; the inner rotor comprises an inner rotor permanent magnet and an inner rotor rotating shaft arranged in the inner rotor permanent magnet; andthe above structure constitutes a medium-speed permanent magnet generator and an electromagnetic transmission. The invention further discloses a PDD (Pseudo Direct Drive) permanent magnet wind generator set. The size and the weight of the mixed type medium-speed permanent magnet wind generator provided by the invention correspond to those of a conventional medium-speed permanent magnet generator;the PDD permanent magnet wind generator set dispenses with a high-power speed change gear box and has the reliability as high as that of a direct-drive permanent magnet wind generator set; besides, not only are the size, the weight and the cost of the permanent magnet generator reduced, but also the transportation problem of large direct-drive permanent magnet wind generator set can be solved.

The fire ring device includes one upper end cap and one lower end cap divided into two, one right and one left, halves, two ring bodies fixed separately onto two ring seats through pin shafts capable of rotating, two lugs separately on two ring seats, and one spiral gear fixed to the ring bodies and the pin shafts. The fire ring device in two half structure is applied in polishing cut of glass product, said has simple driving system and stable product quality.

The invention relates to a bionic foldable double-wing flapping mechanism which specifically aims to achieve folding, unfolding and flapping of double wings by using a positive and negative rotation driving gear set of a single motor, in addition, flapping effects of front and rear wings at different vibration amplitudes and different phase positions are achieved, biological characteristics of twodouble wings of an insect can be simulated, and the aerodynamic performance of flying can be improved. The mechanism is mainly used for improving the complex environment adaptability of a micro ornithopter, and functions such as search and rescue, mapping, reconnaissance, near terrorist fighting and colonial attack and interference can be well achieved.

A long damping cylinder drive fireproof isolation system comprises a hydraulic control system (1) and a long damping oil cylinder (4); the long damping oil cylinder (4) is connected with the hydraulic control system (1), the upper end of a rectangular isolation body (6) is provided with a steel wire rope (11), the steel wire rope (11) is connected with the long damping oil cylinder (4) by a pulley group (10), one side of the rectangular isolation body (6) is provided with a guide track travel switch (5), a turning plate supporting device (8) and a position limiting travel switch (9). The system is characterized in that a power distribution box (2), a liquid level meter (7), a filter (16), a suspension hook (31), an oil drain plug (33) and an isolation box (30) are arranged on a hydraulic oil tank (29) of the hydraulic control system (1), a motor (18) is arranged in the isolation box (30), a hydraulic pump (17) is connected with the motor (18) by a coupling (15), the hydraulic pump (17) is connected with the oil tank and a cartridge inserted valve; the system has no counterweight, simple transmission system, few easy damaged parts, convenient control and safe and reliable usage.

The invention discloses a dual-motor coupler for a pure electric automobile. The dual-motor coupler for the pure electric automobile comprises a motor A, a motor B, a sun gear, two planet gears, a planet carrier, a hollow gear shaft, a duplex gear ring, three normally engaged gears, a duplex gear and a differential mechanism, and comprises three driving gears, during switching of the three gears,power-failure-free gear shifting can be realized, energy loss is relieved, the utilization rate of energy is increased, and adverse effects of power failure to running are reduced; the three driving gears comprises a driving gear A, a driving gear B and a driving gear C; the driving gear A is a low-speed gear; the driving gear B is a high-speed gear; the driving gear C is a large-torque outputtinggear; and requirements for speed and power under different road conditions can be met, running of the motors in a high-efficiency section can be maintained, and the working efficiency of the motor isimproved. By the dual-motor coupler, the power arrangement mode of a traditional automobile is changed, a traditional power system assembly is integrated on a driving axle, a transmission system is simplified, and the transmission efficiency is improved.

The invention discloses a base station antenna, a transmission device, a switching mechanism and a position selection unit, and the position selection unit is applied to a multi-frequency antenna, canfacilitate the increase of frequency bands, and cannot cause the excessive size of a transmission structure or the more complex transmission structure. The switching mechanism adopts the position selecting unit to drive the output gears in at least two output gear sets to rotate. The transmission device adopts the switching mechanism, so power can be provided for adjustment of downward inclination angles of at least two antennas, and a transmission system is simplified; the base station antenna adopts the transmission device, so a transmission system is simplified, the base station antenna can adapt to the increase of the frequency band of the antenna, and the reliability of the working performance of the multi-frequency antenna is improved.

The invention discloses a torque self-checking inner curve hydraulic motor, which comprises main parts such as a flow distribution shaft, a rotor, a plunger, a shell, a cam ring, a rolling wheel unit, an output shaft and the like, wherein the cam ring is supported in the shell through a steel ball; the cam ring and the shell can rotate relative to each other; a stopper is fixed at the outer side of the cam ring; a groove is correspondingly formed in the shell and the stopper extends into the groove; piezoelectric ceramic sensors are arranged above and below the stopper; and the torque of the output shaft is calculated through the stresses of the piezoelectric ceramic sensors. The inner curve hydraulic motor and a torque sensor are combined, so that a specialized torque sensor is saved, the power transmission system is simplified, the torque measuring principle is simple and reliable and the accuracy of dynamic torque measurement of the output shaft is greatly improved; the torque self-checking inner curve hydraulic motor can be widely applied to transmission systems of mining machinery, engineering machinery and crane transport machinery.

The invention discloses a vibration generating device for changing the vibration amplitude of a continuous casting crystallizer through an eccentric wheel. The vibration generating device comprises avibration arm. The vibration arm is connected with one end of a connecting rod, the other end of the connecting rod is connected with an eccentric part of the eccentric wheel, and the eccentric wheelis connected with a drive device. The drive device comprises a motor, and an output shaft of the motor is rigidly connected with the rotary center of the eccentric wheel. The drive device drives the eccentric wheel to rotate in a reciprocating manner forwards and reversely, the eccentric wheel drives one end of the vibration arm to move through the connecting rod, and the other end of the vibration arm drives the continuous casting crystallizer to vibrate. The maximum rotating angle of the eccentric wheel decides the vibration amplitude of the continuous casting crystallizer. The motor drivesthe eccentric wheel to swing back and forth, so that vibration of the vibration arm is achieved; and the movement trail of the eccentric wheel is decided by the vibration amplitude of the vibration arm, so that the vibration amplitude of the vibration arm is modified at will according to actual requirements. The invention further discloses a method for changing the vibration amplitude of the continuous casting crystallizer.

The invention discloses a base station antenna, a transmission device and a switching mechanism. The switching mechanism includes: a mounting unit; a first transmission unit which is installed on themounting unit, wherein the first transmission unit comprises transmission pieces and a driving assembly used for driving all the transmission pieces to move up and down; and a second transmission unitwhich comprises an abutting piece and a transmission shaft, wherein the abutting piece is rotatably arranged on the transmission piece, the abutting piece is provided with a through hole allowing thetransmission shaft to penetrate through, an inner clamping part arranged in the through hole and an abutting part arranged outside the through hole, and the transmission shaft is provided with an outer clamping part in detachable sleeving transmission fit with the inner clamping part. The switching mechanism can drive output gears in the at least two output gear sets to rotate. The transmission device adopts the switching mechanism, so that power is provided for adjustment of at least two downward inclination angles; and the base station antenna adopts the transmission device, a transmissionsystem is simplified, and the base station antenna can adapt to the increase of the frequency band of the antenna.

The invention discloses an antenna, a transmission device and a switching mechanism. The switching mechanism comprises a transmission part, the position selecting unit comprises a worm rotationally arranged on the transmission part, at least two worm wheels in transmission fit with the worm and driving gears in one-to-one correspondence with the worm wheels, a first transmission shaft is arrangedbetween each driving gear and the corresponding worm wheel, and every two adjacent driving gears are longitudinally or / and transversely staggered in the longitudinal direction and the transverse direction; and the driving unit is used for driving the transmission part to reciprocate along a preset track. The switching mechanism can selectively drive the output shaft to rotate, and can adapt to theincrease of the frequency band of the antenna without causing the complex transmission structure; according to the transmission device, the switching mechanism is adopted, power is provided for adjustment of at least two downward inclination angles, and a transmission system is simplified; the antenna adopts the transmission device, a transmission system is simplified, the antenna can adapt to the increase of the frequency band of the antenna, and the reliability of the working performance of the multi-frequency antenna is improved.