58results about How to "Improve jetting accuracy" patented technology

The invention discloses an inkjet printing head, which comprises at least one ejection unit, a cover film matched with the ejection unit, a piezoelectric ceramic actuator and a cover plate, a fluid inflow pipeline, a fluid outflow pipeline and a driving circuit device ; The piezoelectric ceramic brake and the cover plate are connected to form a number of independent piezoelectric ceramic units that are not connected to each other; the cover plate is connected to the injection unit, and the connection contact surface is provided with a number of fluid grooves on one side of the injection unit. The position of the unit corresponds to the position of the groove of the fluid tank; the fluid channel and the cover plate form a fluid channel, and each fluid channel is correspondingly equipped with at least one nozzle leading to the outside, so that the inkjet print head forms side or end surface spraying. Correspondingly, the invention also discloses an inkjet printer. With the present invention, on the premise of increasing the deformation of the piezoelectric ceramic brake and realizing the effective ejection action of the large-diameter ink, adjacent nozzles can operate simultaneously so that all nozzles can work simultaneously, thereby improving work efficiency.

The invention discloses a self-service oral medicine feeding device, which comprises a tooth cover and a medicine feeding device. The tooth cover is an arc-shaped structure with an opening upward and adapted to the upper teeth and lower teeth in the oral cavity, and is located inside the tooth cover and is composed of The medicine feeding airbag 1 and the inflatable airbag 1 are respectively arranged from the inside to the outside; the medicine feeding device includes a fixed seat with an upward semi-spherical structure, a support plate, a support airbag and a medicine spraying airbag, and the right side of the bottom end of the fixed seat There is groove 2, and the bottom end of groove 2 is provided with a permanent magnet, and a positioning mechanism is arranged in said groove 2. The self-service oral medication device provided by the present invention is not only very comfortable, but also easy to operate , In the process of applying medicine, it will not affect activities such as drinking water, spitting, and walking. It can also complete positioning spraying through self-perception to improve spraying accuracy and spraying efficiency. At the same time, it can also control the bite force of teeth The size indirectly controls the time of drug application.

The invention relates to a gas-assisted type metered injection system and a control method thereof. The system comprises a metering pump, a double-fluid nozzle, a reducing agent storage device, a compressed air source and an aftertreatment controller. A reducing agent passageway and a compressed air passageway which are independent from each other are arranged in the metering pump. An inlet of the reducing agent passageway is connected with the reducing agent storage device, an inlet of the compressed air passageway is connected with the compressed air source, and an outlet of the reducing agent passageway and an outlet of the compressed air passageway are correspondingly connected with a liquid channel and a gas channel of the double-fluid nozzle. A liquid regulating mechanism is arranged in the reducing agent passageway, and a gas regulating mechanism is arranged in the compressed air passageway. The liquid regulating mechanism and the gas regulating mechanism are electrically connected with the aftertreatment controller. A liquid and gas mixing cavity is not contained in the metering pump, the risk that a reducing agent is likely to be crystallized in a gas-liquid mixing state is greatly avoided, and the reducing agent injection atomization effect and the injection precision are improved.

The invention relates to a controller, in particular to a urea solution spray electronic controller of a selectively catalytic reduction system. According to the technical scheme provided by the invention, the urea solution spray electronic controller of the selectively catalytic reduction system comprises a sensor module, a control module, an actuator drive module, a communication module and a power supply module, wherein the output end of the sensor module is connected with the input end of the control module; the output end of the control module is connected with the input ends of a urea solution nozzle driving circuit, a urea solution hydraulic pump driving circuit, a urea solution heating device and a urea tank liquid level alarm driving circuit in the actuator driving module; the output end of the power supply module is connected with the power supply ends of the control module and the sensor modules respectively; and the control module and the communication module are mutually connected. The controller can accurately control the spray amount of urea and has high spray accuracy and high adaptability.

The invention relates to a multi-directional ultrasonic micro-droplet jetting and photocuring additive manufacturing device and method and belongs to the field of additive manufacturing. Five identical two-axis movement assemblies are separately fixed to four side surfaces and one top surface of a rack, a material supply system bracket is fixed to the upper surface of a bracket, a material supply system is fixed to the material supply system bracket, and a base plate is fixed to the rack. Focused ultrasonic transducers are used as jetting driving force, the movement of the transducers on the five two-axis movement assemblies is controlled, and materials are continuously supplied to the focused ultrasonic transducers by a liquid storing tank. The multi-directional ultrasonic micro-droplet jetting and photocuring additive manufacturing device has the advantages that micro-droplets are jet by adopting a focused ultrasonic technology, jetting precision is high, jetting speed is high, the sizes of liquid drops are not limited by a nozzle, and the blockage of a sprayer is avoided; by adopting the focused ultrasonic transducers to simultaneously work in five directions, three-dimensional additive manufacture can be realized, the mechanical properties of molded components are controllable in all directions, an auxiliary support structure does not need to be additionally arranged for molding, a complicated after-treatment technology is avoided, and manufacture cost is reduced.

The invention discloses a dispensing valve driven by a giant magnetostrictive rod, which comprises a spray needle (13) and a valve body, an end cover (3) fixed on a housing (12), and an excitation coil (11) passing through the end cover (3) fixed in the housing (12); an elastic pre-tensioning device is provided on the end cover (3); the upper end of the spray needle (13) is compressed by the elastic pre-tensioning device, and the lower end passes through the The casing (12) enters the valve body, the giant magnetostrictive rod is placed in the center of the excitation coil (11), one end is firmly fixed on the casing (12), and the other end is passed through the magnetic field. The sheet (8) bears on the said spray needle (13) compressed by the elastic pre-tensioning device, and the said end cover (3), the magnetic guide sheet (8) and the housing (12) are all It is a magnetically permeable material, and forms a closed magnetic circuit together with the giant magnetostrictive rod. The invention is a dispensing valve based on giant magnetostrictive drive with simple structure, convenient use, high spraying frequency, high spraying precision and long service life.

The invention provides a control method capable of improving injection precision of a urea pump obviously, and particularly relates to the urea pump used for metering based on the stepping motor principle. The injection amount and the rotating speed of a motor are in positive correlation, namely the higher the rotating speed of the motor the larger the injection amount of urea. According to the method, the corresponding relation is adopted, the closed-loop control method is utilized, control precision of the urea pump can be improved by means of primary calibration, measurement, fine calibration and repeated measurement, and therefore the precision of the actual urea injection amount and required urea injection amount is realized.