89results about How to "Overcome surface tension" 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 discloses a device and a method for preparing polysulfonamide nanometer fiber nets by means of airflow-electrostatic combination. The device comprises a liquid storage tank, an air chamber, an electrostatic generator and a receiving device, a plurality of spinnerets are arranged at the bottom of the liquid storage tank, the air chamber is arranged outside the liquid storage tank, air outlets in the number equal to that of the spinnerets at the bottom of the liquid storage tank are arranged at the bottom of the air chamber, the spinnerets are arranged inside the air outlets, an electrode with multiple pins are led from the positive electrode of the electrostatic generator to be connected with the spinnerets, and a lead is led from the negative electrode of the electrostatic generator to be connected with the receiving device. The method includes steps of combining the airflow method and the electrostatic spinning method effectively to prepare the polysulfonamide nanometer fiber nets. By the device and the method for preparing the polysulfonamide nanometer fiber nets, the specific surface area of the polysulfonamide nanometer fibers is enlarged greatly, the problem of blockage of existing electrostatic spinning needles due to inflow of the airflow is alleviated greatly, and spinning efficiency is improved. Besides, nanometer fibers can be prepared at the normal temperature directly, so that production procedures are simplified and production cost is saved.

A thermal inkjet printhead of the roof shooter type that slightly offsets the nozzle aperture centroid from the heater element centroid to correct drop trajectory misdirection caused by vapor bubble asymmetries.

The invention relates to a system for the nanofluid minimal quantity lubrication electrostatic atomization controllable jet flow inner cooling technology. According to the system for the nanofluid minimal quantity lubrication electrostatic atomization controllable jet flow inner cooling technology, based on the electrostatic atomization principle, minimal quantity lubrication cutting fluid fog droplets can be controllably distributed during jetting, the evenness of a fog droplet spectrum can be improved, the deposition efficiency can be improved, the fluid effective utilization rate can be increased, the motion law of the fog droplets can be effectively controlled, in this way, pollution to the environment is reduced, and better health security is provided for workers. The system comprises an adjustable high-voltage direct-current power supply, an inner-cooled cutter converter, a high-voltage electricity converting device and an integrated spray nozzle. A minimal quantity lubrication system supplies minimal quantity lubrication cutting liquid to an inner-cooled drill bit through the inner-cooled cutter converter. The adjustable high-voltage direct-current power supply conducts positive electricity to a needle electrode of the integrated nozzle through the high-voltage electricity converting device, the adjustable high-voltage direct-current power supply makes negative electricity be grounded and transmits the negative electricity to a workpiece through an electromagnetic connector, and then a corona charging field is formed in the needle electrode-workpiece area; in this way, corona charging is conducted on the minimal quantity lubrication cutting fluid, and then electrostatic atomization function is achieved.

The invention belongs to the technical field of flue gas desulfurization, and particularly relates to a flue gas desulfurization process and device, which aim to solve the problems of an existing flue gas desulfurization process and device. The flue gas desulfurization device comprises a retrograde rotation packed bed absorber, a rotation packed bed desorber, a barren liquid storage groove, a rich liquid storage groove, a barren liquid circulation pump, a rich liquid circulation pump, a heat exchanger and a condenser. The flue gas desulfurization process comprises an absorption process and a desorption process. The device provided by the invention is small in size, has a wide in treatment gas quantity range, and is simple in structure and easy to operate. The process has the advantages of high desulfurization rate, low energy consumption, simple process, low investment and running expense, running stability, convenience in starting and stopping and the like.

The invention discloses a liquid-phase circulating hydrogenation treatment method capable of reinforcing gas-liquid mass transfer. The process flow adopted by the method comprises: part of hydrogenation circulating oil and a fresh raw material are mixed to form a liquid-phase mixed material to be filled into supergravity gas-liquid hydrogen dissolution equipment together with hydrogen; through the drive of the high-speed rotation of a feeding rotor, gas-liquid countercurrent full contact is formed; the mixed liquid-phase material in which hydrogen is dissolved is discharge out from the bottom of the supergravity gas-liquid hydrogen dissolution equipment and contacted with a catalyst to undergo a hydrogenation reaction, and part of a liquid phase obtained after reaction is circulated. Compared with the prior art, the method has the advantages that: the rotation of the feeding rotor in the gas-liquid hydrogen dissolution equipment forms a supergravity field, so the gas-liquid mass transfer efficiency is increased greatly, and the liquid phase material can fully dissolve hydrogen; meanwhile, gas impurities such as H2S and NH3 in a reaction system can be removed efficiently, so that the hydrodesulfurization, denitrification, aromatic saturation, cracking and other reactions are promoted.

The invention discloses a preparation method for silicon powder, relates to a process of removing boron by industrial silicon and a preparation method for high-purity superfine silicon powder. The invention provides the preparation method for the silicon powder capable of remarkably reducing the content of the boron. The silicon powder can be used as an ideal low-boron material for a later process, namely pickling and impurity-removing process of purifying solar polycrystalline silicon by a metallurgy method. The preparation method comprises the following steps of: (1), adopting a metallurgical-grade silicon material as the material, putting the material silicon to a crucible, electromagnetically heating up the silicon material to melt the silicon material by an inductive coil; (2), adding a slag former to control the heating power when the silicon material is molten, so that the temperature of the molten silicon is kept to 1550 DEG C to 1850 DEG C in a reaction process, stewing the molten silicon to remove the slag former on the upper layer of the molten silicon after slagging and refining; and (3), controlling the temperature of the molten silicon to 1500 DEG C to 1700 DEG C, and then opening the valve and starting an atomizer; guiding the molten silicon to the atomizer by a guide tube, adjusting the air pressure of the air outlet of the atomizer so that the molten silicon is sprayed out of the atomizer in the forms of mists to enter an atomizing chamber; and collecting the silicon powder by a supporting rotary plate.

The invention discloses a device and method for magnesium process flue gas desulfurization. The device comprises a multi-stage cross flow-reverse flow rotating filling bed absorption device, wherein an exhaust pipe is arranged on the top of the rotating filling bed absorption device; a liquid discharge pipe is arranged at the bottom; a liquid inlet pipe is connected with the side surface of the upper side; an air inlet pipe is connected with the side surface of the lower side; a rotating shaft is arranged inside the rotating filling bed absorption device; two filling material rotors or more are arranged on the rotating shaft; a filling material stator is arranged between the two adjacent rotors; a liquid distributor is arranged in the center of the filling material rotor and is connected with the liquid inlet pipe; the lower end of the rotating shaft extends to the outside of an absorption device to be connected with a frequency modulation motor; the gas inlet pipe of the rotating filling bed absorption device is connected with a SO2-containing smoke gas pipeline; a liquid inlet pipe of the rotating filling bed absorption device is connected with a magnesium hydrate storage groove;the liquid discharge pipe is connected with a magnesium bisulfite storage groove. The method has the advantages that a magnesium hydroxide desulfurizer is used for wet process desulfurization; the purification degree, and the speed in the desulfurization process and the desulfurization efficiency are improved; the smoke gas ultra-low discharge standard can be reached by single piece of equipment.

The invention relates to a method for preparing a lithium iron manganese phosphate precursor and a method for preparing lithium iron manganese phosphate. The method for preparing the lithium iron manganese phosphate precursor comprises the following steps: (1) preparing a liquid material A and a liquid material B, wherein the liquid material A is a mixed solution of a manganese salt and an iron salt, and the liquid material B is an oxalic acid or phosphoric acid solution; (2) carrying out a coprecipitation reaction on the liquid material A and the liquid material B in a supergravity rotating bed to obtain a first slurry; (3) washing and filtering the first slurry to obtain a filter cake; (4) mixing the filter cake with water, adding a carbon source, and uniformly stirring to obtain a second slurry; (5) homogenizing the second slurry; and (6) drying the homogenized second slurry to obtain the lithium iron manganese phosphate precursor. The particle size of the lithium iron manganese phosphate precursor prepared by the method is smaller and more uniform than that of a precursor prepared by a traditional method using a reaction kettle, the preparation speed is increased, and carbon coating is uniform.

The invention provides a manufacture method for a soluble microneedle. The manufacture method comprises the following steps: manufacturing a microneedle mould, wherein the microneedle mould is provided with a plurality of micropore cavities; in addition, using high-pressure spraying equipment to inject macromolecular solution to the micropore cavities; filling the macromolecular solution into each micropore cavity; after the macromolecular solution is dried, taking out a solidified microneedle from the microneedle mould. Optimally, a high-pressure atomizing unit is used for injecting atomized macromolecular solution to the micropore cavities, or high-pressure burst firing equipment is used for injecting the drops of the macromolecular solution to the micropore cavities. When the method disclosed by the invention is applied to manufacture the microneedle, ways including vacuumizing, centrifugal force loading and the like are not required, the manufacture technology of the microneedle is simple, and a superior rate for microneedle manufacture can be improved.

The invention relates to a foamed asphalt generation device, comprising a foaming chamber body and an atomizing nozzle, wherein the foaming chamber body is provided with an asphalt inlet, the asphalt inlet is arranged to introduce asphalt to be foamed, the atomizing nozzle is arranged to eject atomized liquid to the asphalt to be foamed, and comprises a liquid passageway and a gas passageway, the liquid passageway is provided with a liquid outlet, the liquid outlet is arranged to output liquid, the gas passageway is provided with a gas outlet, the gas outlet is arranged to output gas, the gas passageway spirally extends along the circumferential direction of the liquid passageway to one end, provided with the liquid outlet, of the liquid passageway, so that liquid outputted from the liquid outlet can move along the circumferential direction of the liquid outlet under the action of the gas outputted from the gas outlet. The liquid ejected from the liquid outlet can overcome surface tension and viscous force of the liquid under the combined action of centrifugal force and inertia force, so as to improve the atomizing effect of the liquid, and therefore the atomized liquid can contact with the asphalt more uniformly so as to improve foaming quality of the asphalt.

A flexible elongated sealed container with a self-contained opening means fully enclosed within the container to release the substance sealed within the container is disclosed. The enclosed opening means is operated by bending the flexible elongated sealed container at or near the enclosed opening means to release the substance sealed within the flexible elongated sealed container for application. There are no loose parts that may be lost and all components are completely sealed within the container.

The invention discloses a method for preparing lactide through a high-gravity technology. The method comprises the following steps: injecting lactic acid aqueous solution into a high-gravity reactor, and removing free water under carrier gas desorption or a vacuum condition; adding catalyst into anhydrous lactic acid of which the free water is removed, generating polymerization reaction at a certain temperature after even mixing, then, injecting into the high-gravity reactor, further removing reaction water under the carrier gas desorption or the vacuum condition to obtain oligolactic acid; raising the temperature of the reaction liquid to a depolymerization temperature, injecting the reaction liquid into the high-gravity reactor, steaming the lactide from the reaction liquid under the vacuum condition, and cooling to obtain lactide crystal. In the process, a free water removal temperature is 60-100 DEG C, a reaction water removal temperature is 100-140 DEG C, and lactide steaming temperature is 160-220 DEG C. Compared with a traditional vacuum reaction process, the method disclosed by the invention has the advantages of high water removal efficiency, simple production process, high lactide yield and easiness in industrialization.

The invention discloses a magnesium ion battery positive electrode material of a novel microstructure and a preparation method thereof, and belongs to the technical field of battery materials. The invention solves the problems of low reversible capacity, poor rate capability and the like of the electrode material of the existing magnesium ion battery positive electrode. The preparation method comprises the following steps: dissolving manganese oxide in a high-concentration sodium hydroxide solution environment, carrying out hydrothermal reaction and centrifugation, directly freeze-drying the product to prepare a nanosheet and nanowire blended NaMnO electrode material, and adding titanium oxide in the same preparation process to prepare the Ti-doped NaMnO electrode material. The obtained nanosheet and nanowire blended NaMnO electrode material has higher tap density, reversible capacity, rate capability and good cycling stability, and the reversible capacity, the rate capability and thecycling stability are further improved by doping the designed Ti-doped NaMnO electrode material.

An elongated sealed container with a self-contained opening means fully enclosed within the container to release a fluid sealed within the container when the container is bent at or near the enclosed opening means. Once the enclosed opening means is opened, the fluid sealed within the elongated sealed container may be released for application.

The invention discloses a tip-induced electrostatic spinning nozzle which comprises a nozzle body, a spinning needle and an airflow assisted nozzle. A liquid cavity and an air cavity are formed in thenozzle body, a liquid inlet, a liquid outlet, an air inlet and an air outlet are formed in the nozzle body, the liquid inlet and the liquid outlet are communicated with the liquid cavity, and the airinlet and the air outlet are communicated with the air cavity. The airflow assisted nozzle is fixedly arranged at the air outlet and communicated with the air cavity; the spinning needle is fixedly arranged at the liquid outlet and communicated with the liquid cavity; a free end of the spinning needle penetrates the air cavity and extends out of the airflow assisted nozzle; a conductive needle isarranged in the spinning needle. Besides, the invention further discloses a tip-induced electrostatic spinning device. The large-diameter spinning needle can be used without greatly increasing operating voltage, the production efficiency of nanofibers can be improved, and the tip-induced electrostatic spinning nozzle is good in spinning quality and high in safety.