43results about How to "Realize multi-level control" patented technology

The invention provides an intelligent piezoelectric single liquid drop generator and a method thereof. The intelligent piezoelectric single liquid drop generator comprises a one-way flow valve, a piezoelectric spray head and a controller; the one-way flow valve comprises a valve body; the valve body is gradually expanded; the piezoelectric spray head comprises a cavity, a nozzle and piezoelectricceramics; one end of the cavity is detachably connected with the wide end of the valve body; the nozzle is formed in the other end of the cavity; N groups of piezoelectric ceramics are arranged on thecavity; each group of piezoelectric ceramics is provided with M pairs of piezoelectric ceramics; M is greater than or equal to 2; the M pairs of piezoelectric ceramics are uniformly distributed alongthe circumference of the cavity; and the controller is connected with drivers of the piezoelectric ceramics correspondingly. By controlling the working frequency of multiple piezoelectric ceramics arranged on the spray head, the amplitude can be controlled and then the vibration amplitude of a housing of the cavity of the spray head is controlled, the vacuum degree caused by piezoelectric vibration at the nozzle is adjusted, the pressure in the cavity of the spray head is changed by multiple times of expansion and contraction so that multi-level control is realized, liquid is subjected to multiple-stage division, the volume of liquid drops is controlled, and the generation speed of the liquid drops is capable of being controlled.

The invention discloses a micro-infusion multi-flow control device. The micro-infusion multi-flow control device comprises a base, a flow control member, a spring and a fixing member. The base is provided with a piston cavity. The closed end of the piston cavity is provided with a plurality of circularly distributed liquid outlets. The flow control member is provided with at least one front-back through runner. The front end of the flow control member is provided with a piston head and is fitted into the piston cavity of the base, and the rear end of the flow control member is provided with an operating handle. The runner can be in one-to-one but joint with the liquid outlets when the flow control member rotates. The fixing member is arranged at the open end of the piston cavity and is provided with a rotary positioning structure matching with the flow control member. The spring is sleeved to the flow control member. One end of the spring is supported on the piston head of the flow control member, and the other end of the spring is supported on the fixing member. The control device allows for multi-position control for the flow of a disposable infusion pump, so that the clinical application requirement is met. The invention discloses the disposable infusion pump with the control device.

The invention provides a hot continuous rolling mill finish rolling inlet variable speed control method which is especially suitable for metal rolling mills or control devices for machining products, and particularly relates to a method for controlling entrance speed of finish rolling strip steel of a hot continuous rolling mill through computer programs. According to four sets of compensation factors, feature parameters of the entering strip steel are determined; according to the feature parameters of the strip steel, speed reducing point correction of the strip steel is determined; according to the speed reducing point correction, a target speed reducing point of the strip steel is determined, and a dynamic speed reducing point is controlled; according to the target speed reducing point of the strip steel, a tracking start point of the head of the strip steel is determined; according to the feature parameters of the strip steel, the shear front-arranging rate of a flying shear is determined; according to the entrance speed of the strip steel and the shear front-arranging rate of the flying shear, the shearing speed of the flying shear is determined. Speed change points are determined according to the types and specifications of steel, the speed of the strip steel before flying shear is controlled in a multilevel mode, conveying time of the strip steel in an intermediate roller way is saved, the rolling efficiency of different strip steel can be maximized, and the rolling efficiency of the strip steel in the hot rolling process is improved.

The invention provides an SiC high-voltage switch and silicon IGBT mixed type three-phase four-wire high-voltage converter which comprises 2N silicon IGBT low-voltage module units, six SiC high-voltage switches and eight bridge arm inductors. The phase a, the phase b and the phase c of the mixed type three-phase four-wire high-voltage converter are the same in structure, an upper bridge arm is formed by a high-voltage switch and a bridge arm inductor in a series-connecting mode. A lower bridge arm is formed by a bridge arm inductor and a high-voltage switch in a series-connecting mode. Then, the upper bridge arm and the lower bridge arm are connected in series. The connecting point of the upper bridge arm inductor and the lower bridge arm inductor forms an alternating-current output end of a bridge arm with a corresponding phase. An upper bridge arm of a phase o is formed by N low-voltage module units and a bridge arm inductor in a series-connecting mode in sequence, a lower bridge arm is formed by a bridge arm inductor and N low-voltage module units in a series-connecting mode in sequence, then the upper bridge arm and the lower bridge arm are connected in series, and the connecting point of the upper bridge arm inductor and the lower bridge arm inductor forms a middle wire end. The alternating-current output end is connected to load in a three-phase star-shaped connecting mode, the middle wire end is connected to the middle point of the load, by controlling output of the middle wire end, load voltages can generate a sine multi-level phenomenon, and harmonic waves are reduced.