149results about How to "Achieve deceleration" patented technology

The invention relates to a method for generating the atom bean used in atom chip and relative device, wherein, the device comprises a vacuum room, an atom source, a two-dimensional micro adjusting platform, a magnetic iron and inner and outer light paths. The inner and outer light paths comprise a main laser and a re-pump laser; the vacuum room is mounted with a 1 / 4 wave plate reflector group with a hole in center and a direct-guide group; the magnetic light well uses the optical pump laser and the re-pump laser to prepare the atom into optimized weak field scanning state. The invention has small volume and simple structure, while it can supply the optimized weak field scanning state to the atom chip with the atom beam whose longitudinal speed is lower and uniform, transverse speed is nearly zero and density is high. The invention can be used in the guide, wave-division, interference and the Bose-Einstein Coagulation (BEC).

The invention discloses a method for reducing perforation speed of nucleic acid molecules in a nanopore sequencing method. The method comprises the following steps of: adding the nucleic acid molecules to be measured into a nanopore sequencing device filled with electrolyte, wherein the nanopore sequencing device comprises an electrolytic cell provided with an anode and a cathode, and a solid nanopore film for separating the anode from the cathode of the electrolytic cell; placing the nucleic acid molecules to be measured in a cathode cavity of the electrolytic cell,; and when the nucleic acid molecules are measured, applying the voltage between the anode and the cathode, and introducing a reverse external field taking a pressure intensity external field as an electric field simultaneously. According to the method, the pressure intensity external field is reversely applied under the drive of an additional electric field, so that the speed of DNA (Deoxyribonucleic Acid) molecules is reduced when the DNA molecules pass through the solid nanopore, and the speed is reduced by about 50% to 80%, thus the time resolution of a DNA unimolecule detection technology is greatly improved. The method has very bright application prospect on a solid nanopore DNA molecule sequencing device.

The invention discloses an electric adjustable type lifting streetlamp which comprises a hollow lamp post, a lamp arm arranged on the top of the hollow lamp post and a lamp head arranged on the end part of the lamp arm; a base box is fixedly arranged on the bottom of the hollow lamp post; a motor is fixedly arranged inside the base box; the motor is in transmission connection to a reduction mechanism through a motor shaft; a winding drum is arranged on the rotary shaft of the reduction mechanism; a slide block is arranged inside the hollow lamp post in a matched manner; the slide block is fixedly connected to the lamp arm through a slide slot in the side of the hollow lamp post; a slide wheel is arranged above the inner part of the hollow lamp post; the slide wheel is fixedly arranged on a slide wheel supporting base; a steel wire rope is wound on the winding drum; and the steel wire rope is fixedly connected to the slide block through the slide wheel. The electric adjustable type lifting streetlamp has the beneficial effects that: multiple limiting mechanism are adopted, and are used to realize lifting and self-locking safety by utilizing self-locking functions of worms and gears, limiting functions of ratchets and pawls, a regulating function of a limiting regulator and the like, so that maintenance safety can be guaranteed.

The invention discloses an environment-friendly unmanned aerial vehicle for constructional engineering. The environment-friendly unmanned aerial vehicle for constructional engineering comprises a vehicle body, a tail wing and vehicle wings and is characterized in that the vehicle wings are connected with the vehicle body through a folding mechanism; an undercarriage is arranged below the vehicle body and comprises an installation seat connected to the position below the vehicle body, a third rotary shaft arranged on the installation seat, a supporting column, a buffer spring, a cross beam, a supporting beam, two supporting legs and two connecting rods; the upper end of the supporting column penetrates the cross beam and is fixedly connected with the third rotary shaft; the lower end of the supporting column is inserted on the supporting beam; the supporting beam can move linearly along the supporting column; the supporting column is sleeved with the buffer spring; and the buffer spring is located between the cross beam and the supporting beam. By the adoption of the environment-friendly unmanned aerial vehicle, due to the fact that the undercarriage is arranged below the vehicle body, a buffering effect can be achieved in the taking-off and landing processes, and the vehicle body is protected against damage.

The invention discloses a liquid rocket recycling method. A power tail cabin section of a liquid rocket is arranged in a first sub-stage in a detachable mode, wherein the power tail cabin section is separated from the first sub-stage after the first sub-stage of the rocket is separated. A parachute bag which is arranged in the power tail cabin section is opened, thus achieving the deceleration ofthe power tail cabin section, and the power tail cabin section can be recycled after landing. Compared with the prior art, the liquid rocket recycling method has the advantages of convenient control,safety and reliability, cost saving, convenient reuse and the like during the recycling process of the power tail cabin section.

The invention provides an active pre-braking method for a blade electric vehicle. The active pre-braking method for the blade electric vehicle includes the steps that firstly, a vehicle control unit receives the distance S between the vehicle and an approaching object in front of the vehicle, wherein the distance S is sent by a distance measuring device; when the distance S between the vehicle and the approaching object in front of the vehicle is smaller than a preset distance limiting value Sd, the relative speed VX of the vehicle and the approaching object in front of the vehicle is worked out according to the sampling time delta t and the distance [[delta]]S between the vehicle and the approaching object in front of the vehicle within the sampling time; and brake torque T provided by a driving motor is further worked out according to S and VX, so that active pre-braking is realized before the vehicle and the approaching object in front of the vehicle collide. The active pre-braking method is particularly suitable for the situations when the vehicle speed or the relative speed is low or when a driver is distracted or is supposed to step on a brake pedal. Pre-braking is conducted by controlling the vehicle actively, the vehicle is effectively prevented from colliding with the approaching object in front of the vehicle, and safety of the vehicle is improved.

The invention discloses a yarn bearing platform reciprocating transfer device used for textile use, and belongs to the field of textile processing machinery auxiliary equipment. A horizontal push mechanism and a platform reciprocating mechanism of the yarn bearing platform reciprocating transfer device are sequentially and fixedly arranged on the upper side of a horizontal movement base in the horizontal direction. A transmission rotation plate is fixedly arranged on the upper side of a rotation gear. A reciprocating gear on the end portion of the transmission rotation plate is connected withan arc-shaped rack in a meshed manner. A horizontal movement guide rod is arranged on guide rod supports in a sliding manner. A push rod connection plate is arranged between the horizontal movement guide rod and the reciprocating gear. A reciprocating guide plate is arranged on reciprocating guide rods in a sliding manner. A retreating tension spring is arranged between the reciprocating guide plate and a horizontal movement base in a horizontal connection manner. A yarn discharge platform is horizontally arranged on one side above the reciprocating guide plate. A lifting regulation mechanismis vertically arranged between the yarn discharge platform and the reciprocating guide plate. The yarn bearing platform reciprocating transfer device is reasonable in structural design, the yarn discharge platform can continuously and stably conduct horizontal movement motion in a reciprocating manner, the horizontal movement position and the yarn feeding height of the yarn discharge platform canbe regulated according to requirements, and requirements of production and use are met.

The invention discloses auxiliary driving equipment based on voice control. The auxiliary driving equipment comprises an environment sensing module, a driver monitoring module, a voice processing module, a driving decision module, an execution module and a man-machine interaction module. The invention also discloses an auxiliary driving method based on voice control. The method is executed by theauxiliary driving equipment based on voice control, and comprises the following steps: waking up: waking up the auxiliary driving equipment according to a voice waking-up instruction of a driver; sensing an environment: sensing the driving state of the vehicle and the surrounding driving environment, and generating an environment sensing signal; monitoring a driver: monitoring the state of the driver and generating a driver monitoring signal; acquiring a voice instruction: acquiring and processing a sound signal in the vehicle and identifying the voice instruction of the driver from the soundsignal; making a driving decision: generating a driving instruction according to the environment sensing signal, the driver monitoring signal and the voice instruction; and executing: adjusting the driving state of the vehicle according to the driving instruction.

The invention relates to a belt pulley in a belt driving mechanism, in particular to an intelligent belt pulley for walking beam type pumping unit in oil fields. The invention solves the problems that: the prior speed reducer and belt driving mechanism for walking beam type pumping unit can not meet the requirements of long-stroke low-frequency pumping units and the energy-saving requirements of a matched low power motor. The intelligent belt pulley comprises a planet gear mechanism consisting of a sun wheel, an annular gear, a planet carrier and a planet gear, and a belt pulley consisting of a belt pulley core and a belt pulley, wherein the belt pulley core is axially fixed on a planet carrier shaft through a bearing, the sun wheel is in floating connection with the belt pulley core, the annular gear is surrounded by an external friction tape, one end of the friction tape is fixed on a connecting plate on the body of the speed reducer, the other end of the friction end is fixed on a screw which passes through the connecting plate and is fixed through a nut. The invention which has reasonable and simple structure, high mechanical efficiency and lower power consumption can meet the requirements of long-stroke low-frequency pumping units in various types of oil fields and is also applicable to other universal machines.

The present invention relates to a dual-mass flywheel for a drive train of a motor vehicle, having one primary flywheel mass and one secondary flywheel mass (13), which are coupled to one another in a rotationally elastic manner via at least one spring device (19, 39, 53). At least one gear device (21, 31, 51, 51'') is disposed between the spring device and at least one of the two flywheel masses, said gear device causing a deflection movement of the spring device relative (19, 39, 53) to a rotational movement of the two flywheel masses in relation to one another, wherein a characteristic curve of the spring device may be modified by the gear device (21, 31, 51, 51'').

The invention discloses a flexible neutron radiation protection material. The material comprises four layers of structures, wherein the first-layer structure comprises the materials in parts by weight: 10 to 40 parts of rare earth mineral powder, 1 to 20 parts of a tungsten-nickel alloy and 50 to 90 parts of natural rubber; the second-layer structure comprises the materials in parts by weight: 5 to 20 parts of rare earth mineral powder, 50 to 80 parts of natural rubber, 5 to 20 parts of aluminum and 5 to 30 parts of a tungsten-nickel alloy; the third-layer structure comprises the materials inparts by weight: 50 to 100 parts of natural rubber, 5 to 25 parts of aluminum and 5 to 40 parts of a tungsten-nickel alloy; and the fourth-layer structure comprises the materials in parts by weight: 1-10 parts of gadolinium, 50-85 parts of natural rubber, 20-40 parts of aluminum and 2-10 parts of B4C. The material provided by the invention has certain radiation resistance, and can meet the radiation protection requirements of personnel, equipment and devices especially when working in places with complex nuclear radiation backgrounds near strong neutron radiation sources such as nuclear reactors and the like.

The invention discloses an electric scooter speed control method and device. A power source of an electric scooter is connected, and the electric scooter slides in a foot sliding assisting mode; a controller detects the current sliding speed of the electric scooter; and the controller compares the detected current speed of the electric scooter with a threshold value set by the controller, if the current sliding speed of the electric scooter is larger than or equal to the threshold value set by the controller, the controller transmits an acceleration signal to a drive motor of the electric scooter, the drive motor directly drives the electric scooter to slide, and when the current sliding speed of the electric scooter is smaller than the threshold value set by the controller, the controllertransmits an acceleration canceling signal to the drive motor of the electric scooter, and the electric scooter is decelerated and stopped. Foot sliding assisting force is adopted for starting the electric scooter to slide, an acceleration component in an existing electric scooter is removed, the component part of an electric control system of the electric scooter can be optimized, the fault rateof the whole scooter is reduced, manufacturing cost is optimized, and potential safety hazards are reduced.

The invention provides an STM32F429-based dual-motor-driven unmanned ship control system comprising a control module, a data transmission module, a steering engine, an electronic speed controller, a rudder angle sensor, a photoelectric encoder, a GPS module and an unmanned ship ground station. The rudder angle sensor detects the attitude and motion of the unmanned ship rudder; the photoelectric encoder detects the rotation speed and steering of a power motor; and an unmanned ship route and a cruising speed value are stored in the unmanned ship ground station. When sailing, the unmanned ship works according to a remote control instruction of the unmanned ship ground station and the steering engine controls the unmanned ship rudder; the control module is connected to the unmanned ship groundstation by a data transmission module and returns current working data of the unmanned ship; the unmanned ship ground station controls the control module of the unmanned ship remotely to adjust the power motor and the rudder of the unmanned ship according to the current work data of the unmanned ship, so that the unmanned ship sails based on a preset route. Therefore, unmanned driving of the shipin a complicated hydrological environment is realized.

The invention provides a resistance strain gauge, a sensing component, a force sensor and a skateboard. The resistance strain gauge comprises a strain gauge body and resistance wires, wherein the strain gauge body has a symmetric axis, the resistance wires are multiple in number and are divided into two groups, the two groups of resistance wires are electrically connected and are symmetrically arranged at two sides of the symmetric axis, and each of the resistance wires and the symmetric axis form an acute angle. The resistance strain gauge is advantaged in that a problem of influence on use experience of a user for an electric skateboard because of poor control performance of the electric skateboard in the prior is solved.

The invention relates to the technical field of kitchen waste treatment, and particularly relates to a kitchen waste treatment system. The following technical scheme is adopted in the invention: the kitchen waste treatment system comprises a receiving hopper, wherein a spiral conveying rotation machine is connected to the left side of the receiving hopper; a first sorting machine is arranged at the lower end of the left side of the spiral conveying rotation machine; a main discharge port is formed in the lower end of the first sorting machine; a crushing-slurrying machine is arranged at the position of the main discharge port in the lower end of the first sorting machine; a sand setting machine used for sand removal is connected to the crushing-slurrying machine; a moisture-heat heating kettle is arranged in a left-side area of the spiral conveying rotation machine; and materials subjected to the sand removal through the sand setting machine enter into the moisture-heat heating kettlethrough a centrifugal pump to be subjected to moisture-heat hydrolysis treatment. The kitchen waste treatment system has the following advantages: oil interface characteristics are optimized; efficient leaching, liquefying and floating for solid-phase internal oil in kitchen wastes are promoted; the waste oil separation characteristics of the kitchen wastes are improved; and through a centrifugal-gravitational double-effect special separation device, the waste oil recovery efficiency for the kitchen wastes is greatly increased.

The invention relates to the field of manufacturing of high-end equipment, and particularly relates to cold-rolled steel plate polishing equipment applied to manufacturing of the high-end equipment. The cold-rolled steel plate polishing equipment comprises a handheld frame, a main rotating shaft, a clutch holder, a planet rotating part and a polishing disc. According to the cold-rolled steel platepolishing equipment provided by the invention, the rotating speed of a rotating disc is adjustable, and the rotating disc can be adjusted to run at a low speed or at a high speed so as to adapt to different polishing demands. The handheld frame comprises a main ring, a lantern ring, a gear ring and gear ring rack rods; the main ring is of a circular ring structure; an inner ring of the main ringis fixedly connected with the gear ring; the two ends of the lantern ring are each fixedly connected with the corresponding gear ring rack rod; the other ends of the two gear ring rack rods are both fixedly connected to the upper end of the main ring; and the lantern ring is positioned at the upper end of the main ring and is coaxial to the main ring.

The invention discloses a single-eccentric short transmission chain speed reducer. The single-eccentric short transmission chain speed reducer comprises a fixed main body, a bearing sleeve, a power input shaft, a power output shaft and a duplicate gear; the power input shaft comprises positive axis parts at the two ends and an off-axis part in the middle, the axes of the positive axis parts and the off-axis part do not coincide, the duplicate gear is arranged on the off-axis part of the power input shaft in a sleeving mode through a third bearing, and the duplicate gear comprises a first external gear and a second external gear; a first inner gear ring is arranged on the portion, corresponding to the first external gear, of the fixed main body, a second inner gear ring is arranged on the portion, corresponding to the second external gear, of the power output shaft, the first external gear and the first inner gear ring are in internal meshed transmission, and the second external gear and the second inner gear ring are in internal meshed transmission. The single-eccentric short transmission chain speed reducer has the advantages of being simple in structure, short in transmission chain, high in transmission efficiency, stable in transmission, large in transmission moment, wide in speed reducing ratio range and the like.

The invention discloses a wing type energy dissipating plate and a debris flow drainage trough including the same, and belongs to the technical field of debris flow prevention. The wing type energy dissipating plate is of a symmetrical double-wing structure, the front side face of the wing type energy dissipating plate is an arc face, the back side face is a slope, and the arc face is in contact with the slope smoothly; the drainage trough is mainly composed of the wing type energy dissipating plates and a plurality of energy dissipating balls arranged between the wing type energy dissipating plates; and the multiple energy dissipating balls form a plurality of rhombohedra. By adoption of a combined structure of the wing type energy dissipating plates and the energy dissipating balls, energy dissipating can be conducted on the debris flow in a rapid stream for three times, so that the flow path of the debris flow can be changed, and the stability of the debris flow is influenced; and meanwhile, the existence of the wing type energy dissipating plates and the energy dissipating balls increases the roughness of the bottom of the drainage trough, so that the kinetic energy of the debris flow is weakened greatly, the effects of deceleration and energy dissipation of the debris flow in the rapid stream section are achieved, therefore the washing damage degree of the debris flow on the trough bottom is reduced, the safe utilization of the drainage trough is guaranteed, and the later maintenance cost is lowered.

The invention provides a smart bed chair. A bed body and a wheelchair are fitted by a connecting device; the connecting device comprises an upper locking mechanism, a lower locking mechanism, a bed guiding wheel and a bed guiding rail, the bed chair comprises a radar system capable of detecting an obstacle, controllers, an alarm system and an electromagnetic active braking system, the radar systemis four ranging radars mounted around the front, rear, left and right of the wheelchair to detect the surrounding obstacles, the controllers are installed behind a wheelchair back plate and an armrest of the wheelchair, an alarm system includes an alarm device which is a horn mounted on a headrest of the wheelchair and a buzzer installed at the armrest, and the electromagnetic active braking system is installed at two driving wheels; the bed chair is provided with a Bluetooth mechanism, and the Bluetooth mechanism is connected to a smart device app. The bed chair uses the radar system, the controllers, the alarm system and the electromagnetic active braking system, can actively detect the obstacles, achieves the purposes of active alarm, deceleration and braking, and reduces the occurrence of accidents.

The invention provides a numerical control machine tool. A main plate, an auxiliary plate and a balance control box are included. The left side and the right side of the top surface of the main plateare provided with a left guide rail and a right guide rail correspondingly. A front wall and a rear wall are arranged on the top surfaces of a front movable base and a rear movable base correspondingly. A motor is arranged on the rear side face of the front wall, the power output end of the motor is provided with a power shaft, a front chuck is fixed to the rear end portion of the power shaft, a rear chuck is arranged at the front end portion of a connecting column, and the front chuck and the rear chuck are matched to achieve fixing of a to-be-machined workpiece. An upper connecting rod is arranged on the left side of the lower surface of the upper connecting plate, a numerical control tool is connected to the bottom of a tool base, and a collecting chamber for receiving iron scraps generated in the production process is arranged below the numerical control tool. The disclosed technical scheme effectively solves the technical problems that in the prior art, the capability of power recycling for storage battery power supply, intelligent deceleration braking, automatic horizontal state adjusting and the like is not achieved, and popularization and application of the device are facilitated.

The invention discloses a bend-position shunting and mutual-weakening type self-protective petroleum pipeline, and belongs to the field of petroleum pipelines. The bend-position shunting and mutual-weakening type self-protective petroleum pipeline is characterized in that petroleum which flows into an elbow pipe is divided into inner-layered fluid and outer-layered fluid with unequal flow througha shunting deformation sleeve; the outer-layered small-flow petroleum acts upon an inner bending pipe and an outer bending pipe, and the inter-layered large-flow petroleum acts upon the shunting deformation sleeve, and thus, on one hand, impact force of the petroleum against the outer bending pipe and the inner bending pipe can be greatly weakened, and the impact of the petroleum against the elbowpipe is primarily weakened; and meanwhile, under impact flowing of the petroleum, a turning force ball is rotated on the inner bending pipe, so that the outer-layered petroleum realizes mutual convection and collision, and the impact of the petroleum against the elbow pipe can be weakened secondarily; and on the other hand, the shunting deformation sleeve is impacted through the inner-layered petroleum, so that expansion deformation on an elastic sack toward the outside occurs, and stacking on the outer-layered petroleum occurs, and thus, the outer-layered petroleum sprays inwards through overflow holes, and convection between the outer-layered petroleum and the inner-layered petroleum is formed, and impact force of the inner-layered petroleum is weakened, and therefore, tertiary protection on the elbow pipe is realized.

The invention provides an emergent stopping device of a car. The device comprises a plurality of braking mechanisms, a car, running guide rails, car doors and a control mechanism, wherein each braking mechanism comprises two braking boxes, a rolling shaft and a roller; the car is movably mounted on the running guide rail through the rollers; the a first mounting chamber and a second mounting chamber are arranged in each braking box; a braking block, a first electromagnetic absorbing component, a first electromagnetic absorbing body, a second electromagnetic absorbing body and a second electromagnetic absorbing component are mounted on each braking box; a buckling component is mounted on each second electromagnetic absorbing component; a buckling hole fitting the corresponding buckling component is formed in each braking box; a plurality of engaging holes are formed in the running guide rails; the cars are movably mounted on the car; a driving device, which is in drive connection with the car doors and can drive the car doors to move, is mounted on the car; the control mechanism comprises a control device and a rotating speed sensor. With the adoption of the device, people in the car can be effectively protected in case of car falling, and moreover, the car can be prevented from secondary falling after stopping falling.

The invention discloses a unidirectional clutch type stepless speed change device for off-road motor vehicles, comprising a driving wheel component (1), a driven wheel component (4), a belt (3); the driving wheel component (1) comprises a pulley (6), an axle (13), a sliding sleeve (7), a spring seat (8), a pressure roller (9), a driving wheel spring (11), a supporting wheel (10); wherein, the sliding sleeve (7), the spring seat (8) and the pressure roller (9) are sheathed on the axle (13) and are positioned by the supporting wheel (10), the driving wheel spring (11) is arranged between the spring seat (8) and the pressure roller (9); the inner surface of the sliding sleeve (7) is provided with spiral grooves (22), spiral guide surfaces (21) facilitate the transition between two spiral grooves, the axle (13) is provided with pin springs (14) and pins (15), the pins (15) are contacted with the spiral grooves (22) of the sliding sleeve (7). With the structure adopted, the unidirectional clutch type stepless speed change device has the characteristics of simple and reasonable structure, reliable performance and small volume, high integrity and convenient operation and maintenance.

The invention discloses a reverse-gear synchronizer assembly used in a manual transmission. The reverse-gear synchronizer assembly comprises an input shaft, hubs, gear sleeves and reverse-gear gear sets. Each gear sleeve is located between a corresponding bearing and the corresponding reverse-gear gear set, a fixing taper ring is further arranged between each bearing and the corresponding gear sleeve, and each gear sleeve is further provided with a first synchronous ring. Each reverse-gear gear set is further provided with a synchronous gear ring, wherein one end of the synchronous gear ring is connected with the reverse-gear gear set in an engaged manner, and the other end of the synchronous gear ring extends towards the corresponding gear sleeve side. Each gear sleeve is further provided with a second synchronous ring used for being matched with the corresponding synchronous gear ring, the second inner ring face of each second synchronous ring is in a conical shape, and each second inner ring face can be kept to be tightly matched with the outer ring face of the corresponding gear ring. The reverse-gear synchronizer assembly is simple in structure and convenient to install, the input shaft can be effectively decelerated so as to achieve synchronous input shaft deceleration, a reverse gear can be better engaged, and reverse-gear tooth collisions are avoided.

The invention discloses a pressure control method for a decoupled electronic hydraulic brake system, comprising the following steps: calculating a pressure dead zone of the decoupling electronic hydraulic brake system; establishing a system state space equation of the decoupling electronic hydraulic brake system when a servo master cylinder piston is in the range of pressure dead zone; establishing a system state space equation of the decoupling electronic hydraulic brake system when the servo master cylinder piston is in the pressurized range; designing a controller of the servo master cylinder piston in the range of pressure dead zone and non-pressure dead zone; using the saturation function to replace the sign function; and adjusting related control parameters. The pressure control method for a decoupled electronic hydraulic brake system has the following positive effects: 1) the pressure response time of the decoupling electronic hydraulic brake system is effectively reduced so asto improve the braking safety of a vehicle; and 2) the pressure overshoot and the pressure fluctuation of the decoupling electronic hydraulic brake system are effectively reduced so as to improve thebraking comfort of the vehicle.

The invention relates to the technical field of battery raw material production and grinding, and discloses a reciprocating grinding device for button battery raw material production. The reciprocating grinding device comprises a supporting box body; moving wheels are fixedly connected to four corners of the bottom of the supporting box body, a grinding box is fixedly connected to the top of the supporting box body, and a top sealing cover is fixedly connected to the top of the grinding box. According to the reciprocating grinding device, the output end of a driving motor drives a connecting rod to rotate, meanwhile, the bottom of the connecting rod is fixedly connected with a speed reducing device, so that the rotating speed of the driving motor can be slowed down while the driving motorrotates quickly, and the grinding speed can also be reduced, so that the grinding precision is higher; meanwhile, the outer surface of the speed reducing device is sleeved with and movably connected with a fixing device, the speed reducing device can be fixed when normal use of the speed reducing device is not affected, the grinding precision can be further improved, the grinding efficiency is higher, and the bottom of the speed reducing device is fixedly connected with a reciprocating device, so that the grinding is more uniform.

The invention discloses a precise control circuit of an electro-hydraulic servo valve and a gas turbine generator set. According to the precise control circuit of the electro-hydraulic servo valve, alatch circuit is used for carrying out data latching on a control signal input by an external control device, then a D / A conversion circuit converts the digital quantity control signals input by the external control device into analog quantity control signals, finally a negative feedback control circuit receives the analog quantity control signals transmitted by the D / A conversion circuit and precisely adjusts the current input to the electro-hydraulic servo valve, so that the size of the opening of a valve is accurately adjusted so as to accurately control the amount of oil flowing into the generator set, and finally the purpose of accurately controlling the rotating speed of the generator set is achieved. According to the precise control circuit, the precise control circuit of the electro-hydraulic servo valve can accurately control the electro-hydraulic servo valve, so that the acceleration, deceleration and pressure stabilization operation of the generator set can be realized. In addition, the accurate control circuit of the electro-hydraulic servo valve is mainly applied to the gas turbine generator set.

The invention provides an electric vehicle braking system, control method and electric vehicle, and relate to the technical field of electric vehicles; the electric vehicle braking system comprises anair storage cylinder, a brake pedal, a brake master valve, a two-way check valve, an electromagnetic valve, a relay valve, a brake, a battery, a motor and a whole vehicle controller; a first air outlet of the air storage cylinder is connected with a first air inlet of the two-way check valve through the brake master valve; an air outlet of the two-way check valve is connected with the relay valveto form a first pneumatic brake loop; a second air outlet of the air storage cylinder is connected with a second air inlet of the two-way check valve through the electromagnetic valve; the air outletof the two-way check valve is connected with the relay valve to form a second pneumatic brake loop; a third air outlet of the air storage cylinder is connected to the air inlet of the relay valve; the whole vehicle controller is electrically connected with the motor, the electromagnetic valve and the battery. By adding the second pneumatic brake loop on the pneumatic braking system, the protection of the battery when the battery is fully charged is achieved, and the braking effect of the braking system of the electric vehicle is not influenced.

The invention provides a robot real-time motion planning method based on force feedback. Aiming at solving the problem that under the large periodic attitude correction, a mechanical arm cannot conduct smooth plus / minus motion, an existing piecewise linear force position control method is corrected. A six-component force sensor is adopted to sense external acting force to obtain each periodic attitude target correction of all axes of a coordinate system; and the maximum increment of the periodic attitude correction during stable operation of all the coordinate axes is determined as the interpolation stride cardinal number of each periodic attitude correction of all the axes, finally through force position conversion, the periodic attitude target correction of all the axes is subjected to interpolation approximation, shocking caused by the change of the motion state during starting or stopping of the mechanical arm is avoided, and smooth motion in the force control process of the mechanical arm is achieved.