353results about How to "Accurate speed control" patented technology

The invention discloses a melt differential three-dimensional printer. The melt differential three-dimensional printer mainly comprises a material melting unit, a micro-droplet jetting unit, a cylindrical-coordinate system molding unit and a rack, wherein a servo motor drives a screw rod to rotate in the material melting unit; a heater, which is fixedly arranged inside a machine cylinder, ensures that granules are entirely plastified through temperature regulation; a molten material is transmitted by the screw rod to the micro-droplet jetting unit; in the micro-droplet jetting unit, the molten material is transmitted into a valve body through a hot runner in a runner plate; a linear servo motor drives a valve needle to do reciprocating motion in the valve body so as to quantitatively and intermittently squeeze the molten material out of a nozzle to form melt micro-droplets; in the cylindrical-coordinate system molding unit, the molten micro-droplets are injected to a bearing table for cooling and deposition molding; the servo motors in the left-right direction and in the vertical direction are respectively engaged with the corresponding screw rod to rotate so as to drive the material melting unit and the micro-droplet jetting unit to move along the left-right direction and the vertical direction; a circumference servo motor drives the bearing table with a worm gear to rotate through a worm rod so as to realize three-dimensional movement under a cylindrical-coordinate system.

The invention relates to a drilling machine and particularly relates to a novel drilling machine for a carbon fiber composite plate. The technical problem to be solved by the invention is to provide the novel drilling machine for the carbon fiber composite plate, which is low in energy consumption, convenient to operate and high in drilling precision. In order to solve the technical problem, the invention provides such novel drilling machine for the carbon fiber composite plate, comprising a left frame, a bottom plate, a placing platform, a first rocking handle, a first bearing block, a first rotating shaft, a first bevel gear, a pressing block, a moving rod, a sleeve, an elastic element, a first fixed plate and the like; the left side of the top of the bottom plate is welded with the left frame; the middle of the top of the bottom plate is welded with the placing platform; and the upper end of the right side of the left frame is connected with the first bearing block in a bolt connection way. According to the novel drilling machine for the carbon fiber composite plate, the horizontal movement of a drill bit and the drilling operation for any position on the carbon fiber composite plate can be realized through rotating the first rocking handle, and the vertical movement of the drill bit can be realized through rotating a second rocking handle.

The invention provides a rotating speed control method and device of a brushless DC fan, the brushless DC fan and a refrigerator. The rotating speed control method of the brushless DC fan comprises the following steps: detecting the real-time rotating speed of the brushless DC fan; comparing the real-time rotating speed with a target rotating speed; adjusting the current duty ratio of the driving voltage of the brushless DC fan according to the comparison result, so as to adjust the real-time rotating speed to be matched with the target rotating speed. According to the technical scheme, the rotating speed control method of the brushless DC fan has the advantages that the duty ratio of the driving voltage of the fan can be accurately controlled, thus the output voltage of the fan can be accurately controlled, and as a result, the accurate control of the rotating sped of the fan is realized, and the noise of the refrigerator is minimized.

The invention discloses a fan rotation speed control method and device. The method is applied to equipment provided with a fan. The method includes the steps that parameters for determining the target rotation speed of the fan are obtained, and the parameters comprise one or more of the environment parameter of the environment where the equipment is located, the equipment arrangement posture parameter and the work power of the equipment; the target rotation speed of the fan installed in the equipment is determined according to the obtained parameters for determining the target rotation speed of the fan; the rotation speed of the fan installed in the equipment is controlled according to the determined target rotation speed. By means of the fan rotation speed control method and device, the rotation speed of the fan can be controlled accurately.

The invention relates to apolishingequipment, in particular to a polishing equipment for industrial steel pipes, and provides a polishing equipment for industrial steel pipes polishing uniformly, having less harm to people and saving both time and effort. In order to solve the technical problems, the invention provides the polishing equipment for industrial steel pipe. The polishing equipment for industrial steel pipes comprises a base plate, a first support plate, a second support plate, a first sliding rail, a first bearing pedestal, a second bearing pedestal, a positioning device, a steel pipe, a first gear and a first motor. The first support plate is welded at the left side of the base plate. The second support plate is welded at the right side of the base plate. The second support plate is arranged at the right of the first support plate. The polishing equipment for industrial steel pipes achieves the effect of uniform polishing, less harm to people and saving both time and labor during polishing through rotating steel pipes and moving polishing wheels.

The invention discloses a magnetic coupler which comprises a power input shaft, connecting flanges, permanent magnet outer rotor assemblies, cage type inner rotors, a power output shaft and a mechanical speed adjustment device, wherein the permanent magnet outer rotor assemblies have hollow cup-shaped structures, are sleeved outside the cage-type inner rotors and realize transmission of torque under the coupling action of an air gap magnetic field between the permanent magnet outer rotor assemblies and the cage-type inner rotors; the mechanical speed adjustment device can change axial air gap areas between the permanent magnet outer rotor assemblies and the cage-type inner rotors according to a lever theory, thus realizing stepless speed variation for load rotating speed. According to the magnetic coupler, a method for designing the number of pole pairs of the permanent magnet outer rotor assemblies is provided on the basis of a minimum torque ripple rule, so that the thickness of yokes and the rotating inertia of the coupler are reduced. The cage-type inner rotors can adopt structures which are the same as or similar to that of the conventional motor cage rotor iron core. The magnetic coupler disclosed by the invention can be coaxially connected with a load and can be used as a belt wheel adapter matched with a belt wheel.

A badminton pitching machine with a finishing function comprises a finishing mechanism, a conveying mechanism, a pitching mechanism, a racket control latching mechanism and three supporting plates, wherein the badminton finishing mechanism includes a finishing cylinder, a conical disc, a baffle and a first motor. The conveying mechanism includes a transmission band, a ball-collecting cylinder, a turntable, a guiding cylinder and a guiding ring, and the badminton can be achieved from finishing mechanism to pitching mechanism. The pitching mechanism includes a ball-taking claw, a racket, a rack,a racket base, a first gear, a second gear, a second semicircle gear, a fourth motor, a fifth motor and a racket control latching mechanism. The badminton pitching machine with the finishing functionsolves the defects that the existing badminton pitching machine has simple structure but insufficient function or has complicated structure but no badminton finishing function, does not require manual works to conduct finishing, simultaneously can control the badminton to achieve the movement in vertical, longitudinal and rotary three degrees of freedom, increase the changes of pitching force, angle and track, and preferably simulate various complicated and changeable motion patterns in the badminton sport.

The invention discloses a bus priority road traffic cooperative induction method for automatic driving. The method comprises the steps of: upgrading road infrastructures and traffic sign marking linesfor automatic driving; optimizing a bus priority road traffic cooperative induction strategy for automatic driving; determining a bus priority road intersection signal cooperative timing scheme for automatic driving; calculating bus stop service time of bus priority guidance; determining a bus priority intersection signal cooperative induction method for automatic driving; and designing a publictransport vehicle priority passage induction plan under the disturbance of the emergency traffic incident. According to the invention, based on a traffic flow traffic operation process in an automaticdriving environment, accurate control and real-time adjustment and optimization of road speed can be realized; accurate and real-time two-way communication can be carried out between the bus and thesignal control machine, an intersection signal timing scheme can be adjusted in real time to enable the bus to pass within bus priority guarantee time, and the passing efficiency of the bus is greatlyimproved.

The invention discloses a screw type additive manufacturing spray head. Particles of the conventional size can be used as a raw material, the material extrusion process is stable, the extrusion force is large, and the forming efficiency is high. The screw type additive manufacturing spray head comprises a machine barrel, a nozzle fixed to the front end of the machine barrel, a screw arranged in the machine barrel and a drive motor fixed to the rear end of the machine barrel. The tail end of the screw is arranged in a cone shape. The front end of the screw is connected with the output end of the drive motor. The part, provided with a thread, of the screw is sequentially provided with a feeding segment, a compression segment and a metering segment from the front end to the tail end according to threaded groove depths. The groove depth of the feeding segment is the maximum, and the feeding segment is arranged in an equal groove depth manner. The groove depth of the metering segment is the minimum, and the metering segment is arranged in an equal groove depth manner. The groove depth of the compression segment is gradually changed into the minimum groove depth from the maximum groove depth. A feeding opening is formed in the position, corresponding to the feeding segment of the screw, of the machine barrel. A first heating ring is arranged at the position, corresponding to the compression segment, of the machine barrel, and a second heating ring is arranged at the position, corresponding to the metering segment, of the machine barrel. The interior of the nozzle is arranged in the manner of a conical face matched with the tail end of the screw. A set of heating bars is arranged on the nozzle in an inserted manner.

A fatigue strength test stand of a locomotive bogie is as follows: drive eccentric shafts of a front drive eccentric wheel and a back drive eccentric wheel are fixed on one side of the bogie through a bearing and a bearing seat; driven eccentric shafts of a front driven eccentric wheel and a back driven eccentric wheel are fixed on the other side of the bogie through a bearing and a bearing seat; the front and the back drive eccentric shafts are respectively connected with a drive device. The test stand can simulate the vertical vibration, the transverse vibration, the nodding and the compound vibration of the bogie in full range so as to truly measure the fatigue life of the bogie, thereby determine the life cycle, and providing reliable guarantee for the safe operation of the locomotive. The test stand has the advantages of simple structure and convenient operation.

The invention discloses a control method for speed limit of an AMT (Automatic Mechanical Transmission) type vehicle. The control method comprises the following steps that: a. an automatic TCU (Transmission Control Unit) receives a current gear signal, an engine revolution speed signal and a clutch slip ratio signal detected by a sensor, and transmits the signals and a determined driving chain combination state signal to a VCU (Vehicle Control Unit); b. the VCU calculates a maximum gear allowed to be switched and a maximum limit value of the engine revolution speed, real time transmits a command signal to an ECU (Electronic Control Unit) and detects whether the current gear is higher than the allowed maximum gear; c. the VCU transmits a gear-switching request command and reduces the current gear to be the allowed maximum gear; d. the ECU regulating a rail pressure and a fuel injection quantity according to the maximum limit value of the engine revolution speed so as to regulating the engine revolution speed to be lower than the maximum limit value; and e. a vehicle regularly runs. The invention has the beneficial effects of largely reducing the labor strength when effectively improving the safety of a driver.

The invention discloses a method for controlling normal starting of a dual-clutch automatic transmission. The method comprises the steps of obtaining the position of an ignition lock of an engine and the position of a gear shifting rod; obtaining the opening of an accelerator pedal, the net torque of the engine and the rotating speed of the engine every a set sampling period; judging whether the ignition lock of the engine is in the ON gear, judging whether the gear shifting rod is switched to the D/R gear from the P gear, judging whether the opening of the accelerator pedal is larger than the set opening threshold value of the accelerator pedal; if the ignition lock of the engine is in the ON gear, the gear shifting rod is switched to the D/R gear from the P gear, and the opening of the accelerator pedal is larger than the set opening threshold value of the accelerator pedal, switching the gear shifting rod to the D gear from the P gear, conducting normal starting control over a first clutch so as to enable the difference between rotating speed of the engine and the set target rotating speed to meet the set error range; when the gear shifting rod is switched to the R gear from the P gear, conducting normal starting control over the second clutch so as to enable the difference between rotating speed of the engine and the set target rotating speed to meet the set error range. According to the method, in the normal starting process, switching between the two clutches is not required, and safety and comfort of a whole vehicle are facilitated.

The invention relates to an extracted liquid filtering device. The extracted liquid filtering device comprises a circular truncated cone-shaped housing; the internal part of the circular truncated cone-shaped housing is hollow; the upper end and the lower end of the circular truncated cone-shaped housing are provided with openings; the opening on the upper end is an upper circular hole, and the opening on the lower end is a lower circular hole; a circular truncated cone-shaped filter screen is arranged in the circular truncated cone-shaped housing; the height of the circular truncated cone-shaped filter screen is smaller than or equal to that of the circular truncated cone-shaped housing; the upper end external edge of the circular truncated cone-shaped filter screen is pressed against theinternal edge of the upper circular hole; the center of the bottom wall of the circular truncated cone-shaped filter screen is detachably provided with a vertical rod; the vertical rod is connected with a transmission device; a liquid level sensor and a concentration sensor are arranged on the internal wall of the circular truncated cone-shaped filter screen; the transmission device, the liquid level sensor, and the concentration sensor are connected with a controller through electric connection respectively. The above design is capable of accelerating extracted liquid filtering speed; when the circular truncated cone-shaped filter screen is blocked, it is not necessary to pump out the unfiltered extracted liquid; and processing efficiency is increased.

The invention discloses a simulative cutting experiment device for a coal mining machine. The simulative cutting experiment device comprises a device body and a coal walling simulating mechanism; the device body is provided with a cutting mechanism, a first driving mechanism drives the cutting mechanism to move along a rail, and a second driving mechanism drives the cutting mechanism to vertically move. On one hand, the whole experiment device adopts the modular design, all the parts are integrated on the device body and a base, simulation on height adjusting motion, traction motion and coal rock cutting of the coal mining machine can be simultaneously achieved, and assembly and disassembly are convenient; on the other hand, the first driving mechanism and the second driving mechanism are both controlled by electro-hydraulic proportional valves, therefore, precise control cover the cutting drum height adjusting speed, the device body traction speed and the cutting drum height can be achieved, the working condition that the coal mining machine cuts coal rock underground can be simulated more truly, simulation loading on the electro-hydraulic proportional cutting mechanism in the experiment device is achieved, and an integrated platform is supplied to experimental study on simulative cutting of the coal mining machine and the electro-hydraulic proportional height adjusting system characteristics.

The invention relates to a punching device, in particular to a precision hardware punching device and aims at achieving the technical purpose of providing the precision hardware punching device convenient to operate and capable of punching flat sections and reducing burrs. To achieve the above technical purpose, the precision hardware punching device is provided and comprises a left frame, a containing table, a bottom plate, a first nut, a rocking handle, a screw, a push block, a pressing block, an electric push rod, a cutter, a sliding block, a fixing plate, a first connecting rod and the like. The left frame is welded to the left side of the top of the bottom plate. The containing table is welded to the left side of the top of the bottom plate and located on the right side of the left frame. A groove is formed in the lower portion of the right side of the left frame. The first nut is welded to the lower portion of the left side of the left frame. A rotation motor is used for driving a first rotation shaft to rotate, the first rotation shaft drives a first bolt and a second bolt to rotate, and the first bolt and the second bolt drive a second nut and a third nut to move towards the middle from the two sides correspondingly.

The invention relates to a stirring device, in particular to a quick stirring device for water purifier assembling. According to the stirring device for water purifying equipment assembling, time and labor are saved, uniform smearing is easy, and smearing is convenient. The quick stirring device for water purifier assembling comprises a top plate and the like. A lifting mechanism and a bracket are arranged at the bottom of the top plate; the lifting mechanism is located on the left portion of the bracket; a stirring rod is arranged at the bottom of the lifting mechanism; a supporting rod is arranged on the left side of the bracket and connected with the lifting mechanism; a bottom plate is arranged under the bottom of the top plate; a stirring box is arranged on the top of the bottom plate; and the right side of the top of the bottom plate is connected with the bracket. According to the quick stirring device, a sealing ring and Vaseline are more conveniently stirred, so that the Vaseline is smeared on the sealing ring more evenly, and the sealing ring and the Vaseline can be stirred more quickly.

The invention discloses a method for controlling the primary powder apparent density accurately by utilizing a ball mill. The method comprises the following steps: (1) feeding, namely, carrying out flushing, crush breaking, hammer breaking or jaw breaking on qualified sponge iron, lifting powder with the particle size being 10-15mm to a ball milling front stock bin, conveying the powder into the ball mill by a vibration feeder, and grinding; (2) carrying out parameter control, namely adjusting the current of the vibration feeder arranged at the feeding end of the ball mill so as to control the feeding quantity, adjusting the current of the ball mill so as to control the rotation speed of the ball mill, thus controlling the grinding speed, adjusting dedusting air suction capacity so as to control the fine powder feeding quantity; (3) discharging through three parts; and (4) screening, namely after screen underflow conforming to the granularity need enters a magnetic separator at the lower part of a drum screen, carrying out magnetic separation, lifting the screen underflow to a storage bin, conveying oversized products not conforming to the granularity need to the ball milling front material feedback storage bin by a material returning belt, adding the oversized products into the ball mill quantitatively according the need of primary powder ingredients, and grinding. According to the method, the apparent density and the particle constitution can be effectively controlled, the production cost is lowered, and the yield is increased.

The invention discloses an intelligent integrated control system and an intelligent integrated control method based on serial communication for a submerged pump, and belongs to the technical field ofintelligent control for submerged pumps. The control system comprises a shore-based upper computer system and underground submersible pump systems which are connected through serial communication wirecables. Each underground submersible pump system is composed of an impeller assembly, a motor and a printed circuit board, wherein the printed circuit board is integrated with an IGBT rectification-inversion module, a motor drive module, a sensor input module and a serial communication port. Each underground submersible pump system sends the internal vibration data, temperature and humidity dataand leakage-point detection sensor data to an upper computer controller in real time, and receives the instructions of the upper computer controller. The intelligent integrated control system is highin integration degree, convenient to install and automatic in control, thereby greatly lowering the labor intensity of personnel, and increasing the working efficiency. The intelligent integrated control method based on serial communication for the submerged pump is based on a multi-sensor fusion technology, and a PID control technology for the rotational speeds and the currents of the motors, thereby meeting the requirements of independent variable-frequency speed regulation and fault detection for the submerged pump.

The invention discloses an achieving method for controlling gear selecting and shifting of a double-clutch transmission through a rotating speed request. The method includes the steps that when a traveling working condition is changed, the speed of an engine is directly adjusted through the rotating speed request, and therefore rapid synchronizing between the rotating speed of the engine and the rotating speed of a shaft where a pre-combined gear is located is accurately controlled. A speed adjusting method specifically includes the steps of a rotating speed request initialization phase, a rotating speed request activating phase and a rotating speed returning section. By means of the achieving method, synchronous responses are faster while synchronizing between the rotating speed of the engine and the rotating speed of the pre-combined shaft can be accurately controlled.