34results about How to "Control output speed" patented technology

The invention discloses an auxiliary material supply synchronizing mechanism of metal powder additive manufacturing equipment. The auxiliary material supply synchronizing mechanism comprises a frame body, a disc-shaped transverse mounting plate is fixedly installed on the upper portion of the frame body, a barrel body is fixedly installed in the middle of the top of the mounting plate, a first vertical shaft is installed in the middle of the bottom of the barrel body, the lower end of the first vertical shaft is movably connected with a bottom bearing in the barrel body, a conical roller fixedly sleeves the position, close to the upper end, of the first vertical shaft, the small-diameter end of the conical roller faces upwards, the lower end of the first vertical shaft is fixedly sleeved with a driven gear, the inner bottom of the barrel body is fixedly provided with a vertical power motor, an output shaft of the power motor is fixedly provided with a driving gear, and the driving gearis matched with the driven gear in a meshed mode. According to the auxiliary material supply synchronizing mechanism, the output speeds of metal powder particles in different material cylinders can be linearly controlled through adjustment of corresponding electric telescopic rods, and the whole mechanism only needs one power motor to provide the power; and therefore, the auxiliary material supply synchronizing mechanism is simple in structure and convenient to use.

The invention discloses a device and a method for preparing particulate-reinforced aluminum matrix composites by stirring and casting. The device comprises a lifting mechanism, a resistance furnace, a fixed column, a supporting mechanism, a stirring device, a particulate conveying device, a furnace lid, a feeding hole, a gas inlet tube, a graphite crucible and a stainless steel crucible. The device for preparing particulate-reinforced aluminum matrix composites by stirring and casting can be used for quantitatively conveying and adding reinforced particulates, and realizing gas protection and automatic preparation. The device is delicate in structural design, simple and convenient to operate, high in automation degree and good in stability. By virtue of the gas protection, gas absorption and surface oxidization of a melt in a preparation process based on stirring and casting are reduced; the quantitative conveying and adding of the reinforced particulates are realized by virtue of the particulate conveying device; the quantitative control on a stirring position and a stirring speed is realized by virtue of the lifting device and the stirring device, and thus, the performance and preparation efficiency of a composite material are well improved.

The invention provides a scraper conveyor and its self-adaptive speed regulation method, which can obtain the real-time position value of the scraper conveyor when the shearer is running; read and record the running torque value of the frequency converter of the scraper conveyor, Through data analysis, the no-load torque value and full-load torque value of the scraper conveyor are obtained; through the relevant calculation of the frequency converter torque, speed, and shearer position, the current coal transportation volume of the scraper conveyor is simulated; according to The calculated coal volume is used to adjust the given speed of the scraper conveyor; the entire speed regulation process does not require the participation of any auxiliary sensors, and the reliability is higher.

The invention provides a variable-pitch shape memory alloy rotary motor. The rotary motor uses a shape memory alloy helix as a drive element, one end of the shape memory alloy helix is connected with an output shaft through a given screw, the other end of the shape memory alloy helix is connected with a motor base through a fixing clamp, and the output shaft is fixed on the motor base through a bearing. The shape memory alloy helix is shaped at high temperature to form a pitch-diameter large-sized helix and is processed at low temperature to form a pitch-diameter small-sized helix and then installed in the motor, and the helix at the high temperature and the helix at the low temperature are identical in height. After a power supply is switched on, the shape memory alloy helix restores to the pitch-diameter large-sized helix at the high temperature due to the shape memory effect and drives the output shaft to perform rotary motion so as to output torque and a rotating angle, but the output shaft does not displaces axially. The variable-pitch shape memory alloy rotary motor is simple in structure, convenient to control, large in power density and high in energy utilization efficiency and can serve as a discontinuously-rotating power device definite in torque and rotating angle.

The present invention proposes an oil control profile control device, which includes an outer cylinder; a base pipe interferingly arranged in the outer cylinder; the base pipe and the outer cylinder form an annular space with an open upstream end and a blocked downstream end; A flow hole for connecting the inner cavity of the annulus space and the base pipe is arranged on the upper part; and a filter assembly communicated with the upstream of the annulus space. Using this device can increase the flow resistance of the fluid in the reservoir, thereby controlling the production rate of fluid in the reservoir corresponding to different sections of the horizontal well, and then adjusting the fluid production profile of the horizontal well, thereby inhibiting the edge-bottom water coning and delaying the flow of water. The water breakthrough time of flat wells can achieve the purpose of increasing single well production and recovery.

The invention provides a servo control method for the gasoline engine speed in a hydraulic system of a legged robot. The servo control method comprises the following steps: (1) calculating the engine speed error e and the engine speed error change rate ec; (2), after the fuzzy logic calculation of e and ec, outputting the proportionality coefficient increment delta kp and the integral coefficient increment delta ki; (3) calculating the proportionality coefficient and the integral coefficient according to the following formulas correspondingly: kp = kp0 + delta kp and ki = ki0 + delta ki; (4) calculating the accelerator opening degree according to the following formula: S1 = S1_old + kp*ec + ki*e; (5) calculating the accelerator opening degree change caused by the hydraulic oil flow rate change according to the following formula: S2 = kQ*detal Q; and (6) calculating the final accelerator opening degree Sf = S1 + S2, wherein the rotation of a steering engine is controlled through the accelerator opening degree in the PWM form, the air inlet volume is controlled by controlling the opening degree of an engine throttle valve through an accelerator cable, and finally the engine speed is controlled. The servo control method provided by the invention has the advantages that the feedforward control is adopted, so that the stable engine speed can be guaranteed well under the circumstance that the flow rate changes suddenly; parameters are modified online by adoption of fuzzy self-tuning, so that the different control requirements can be met; and accordingly, the hydraulic system can have the good dynamic property and static property.

The invention discloses a longitudinal-bending composite peristaltic precision piezoelectric driver and an excitation method thereof, and relates to the technical field of piezoelectric driving. The invention aims to solve a problem that an existing piezoelectric driver cannot have the properties of rapid movement, nanometer-scale positioning, strong power output and large-range movement stroke. The longitudinal-bending composite peristaltic precision piezoelectric driver is characterized in that a ceramic group formed by a bending vibration ceramic group and a longitudinal vibration ceramic group is arranged on a rear clamping body, n rear clamping bodies are arranged on a fixed base in parallel or arranged on a base body along the circumferential direction of the base body, a front clamping body is arranged at the front surface of each ceramic group, and each front clamping body is contacted with a linear rotor or a rotary rotor through a driving foot; the longitudinal vibration ceramic groups perform telescopic deformation so as to control contact / separation of the corresponding driving feet and the rotor, the bending ceramic groups perform bending deformation so as to realize stepping driving for the rotor, and continuous driving is realized through coordinately setting the operating process of a plurality of energy converters. The longitudinal-bending composite peristaltic precision piezoelectric driver has the advantages of large stroke, high positioning precision, adjustable output speed and output power and the like, and has good application prospects in the fields such as intelligent robots, aviation and aerospace and high-end equipment manufacturing.