120results about How to "Jet stability" patented technology

The invention discloses a bidirectional spiral electrostatic spinning device, and relates to an electrostatic spinning device. The bidirectional spiral electrostatic spinning device is provided with bidirectional threaded guide rods, liquid storage sliders, vertical slide bars, guide rails, a framework, a controllable injection device, a liquid guide pipe, a liquid distributing device, a high-voltage power source, air pumps, pressure regulating valves, air guide pipes, partition plates, motors, driven belt pulleys, driving belt pulleys, V-shaped belts, air hole arrays and collecting devices. The bidirectional spiral electrostatic spinning device has the advantages that large-area and multi-jet injection effects can be realized by the aid of the bidirectional threaded guide rods, so that the electrostatic spinning efficiency further can be improved, phenomena of electrostatic interference among spinning jets and electric field concentration can be reduced, uniform distribution of nano-fibers on collecting plates can be promoted, the thickness uniformity of collected nano-fiber membranes can be improved, the quality of the nano-fiber membranes can be enhanced, the multiple jets can be assuredly stably and quickly injected, and large-area uniform nano-membranes can be collected; the bidirectional spiral electrostatic spinning device is applicable to injection devices with different bidirectional threaded guide rods and different thread shapes, and the lengths, the quantities and the shapes of the bidirectional threaded guide rods of the injection devices can be different from one another.

The invention discloses a direct injection molten iron desulphurization spray gun for a metal particle magnesium or magnesium-based or calcium-based desulphurization agent. The direct injection molten iron desulphurization spray gun comprises a connecting flange and a gun barrel which are sequentially connected and communicated, wherein the gun barrel comprises a connecting section gun barrel and a gun body section gun barrel; the connecting section gun barrel comprises a gun core; a distributor is connected with the lower end of the gun core of the gun body section gun barrel; the distributor comprises an upper end short connecting pipe, a lower end plug platform and a plurality of through holes formed in the wall of the short connecting pipe; and each through hole is communicated with a jetting pipe, and the jetting pipes are distributed in a fire-proof pouring material liner positioned outside the side wall of the distributor. The direct injection molten iron desulphurization spray gun disclosed by the invention can be used for enhancing the jetting strength, extending the desulphurization reaction area and intensifying the gasification and dissolution of metal particle magnesium through structural design, and can be used for enhancing the adaptability on low-quality metal particle magnesium and jetting desulphurization of molten iron tanks with different sizes, extending the adaptive capacity of a process and reducing the consumption cost of the molten iron desulphurization metal particle magnesium through the improvement of desulphurization process steps.

The invention discloses a pneumatic microdroplet jetting state control system and method based on machine vision, and belongs to the field of microdroplet jetting. By means of the method, the high speed solenoid valve breakover time t or the high speed solenoid valve front end air pressure P can be singly controlled, and single microdroplets can be stably jetted out in the initialized jetting andjetting process of the system. According to the system and method, a pneumatic microdroplet jetting device can automatically identify the microdroplet jetting state from shot microdroplet images in the initialized jetting and jetting process, the opening degree of an electric proportional valve is controlled to adjust the high speed solenoid valve front end air pressure P and the high speed solenoid valve breakover time t, and it can guarantee that the system can stably jet out single microdroplets all the time. The operation that an operator needs to judge the microdroplet jetting state according to the microdroplet images shot by a CCD camera in real time, the high speed solenoid valve front end air pressure P and the high speed solenoid valve breakover time t need to be manually adjusted is replaced, and the using efficiency of the device is improved.

The invention discloses a large-flow adjustable firefighting water-sprinkling sprayer. During practical use, the large-flow adjustable firefighting water-sprinkling sprayer is mainly used for large-flow firefighting conditions during big fire; when fire breaks out, after a glass ball is broken due to heating, temperature sensors on a bearing plate perform temperature induction on a fire source direction and transmit signals to a controller; after the controller receives the signals of the temperature sensors, the controller controls a motor of a telescopic driving device which is opposite to afire source in direction to be started; and the motor drives a corresponding gear to rotate, and further a corresponding connection chain is pulled upwards. Besides, when the fire source is located between a left side and a right side, telescopic driving devices close to two sides of the fire source can perform contraction control on corresponding connection chains synchronously, so that targetedfire extinguishing can be performed in the direction; besides, elastic supporting sleeves which sleeve the connection chains exert an elastic supporting effect on the connection chains, so that supporting strength of the connection chains to a water spilling disc can be enhanced; and a large-flow water flow can be stably baffled and guided by the water spilling disc, so that precise spraying fireextinguishing is realized.

Provided is a multilayer piezoelectric element which achieves a high response speed and an increase in the displacement amount, ensures sufficient mechanical strength, and can suppress degradation of characteristics. A multilayer piezoelectric element (1) includes a layered body (7) in which a piezoelectric layer (3) and an internal electrode layer (5) are alternately layered. In the multilayer piezoelectric element (1), a polarization domain (12) lying astride a plurality of crystal grains (11) is formed in the piezoelectric layer (3). Since the polarization domain (12) lying astride the crystal grains (11) is formed in the piezoelectric layer (3), in the multilayer piezoelectric element (1), the response speed and the displacement amount can be increased, high mechanical strength is ensured, and degradation of characteristics can be suppressed.

A water base ink for ink-jet recording to be used for an ink-jet recording apparatus having an ink-jet head comprises a self-dispersing type coloring agent, water, and a water-soluble organic solvent. The surface tension of the ink is 30 to 50 mN/M, the advancing contact angle with respect to the jetting surface of the ink-jet head is not less than 65°, the receding contact angle is not less than 55°, and the difference between the advancing contact angle and the receding contact angle is not more than 20°. It is possible to jet the ink stably, it is possible to form a sharp recorded image with less blur, and it is possible to obtain the recorded image excellent in water resistance.

The invention provides a resin forming device and a resin forming method. In the resin forming device, liquid resin is ejected out through supplying compressed air to a nozzle. A nozzle (6) mounted on the front end of a distributor (1) is provided with a resin supply port (14), a resin ejecting port (15) and an air supply port (16). The resin feed port (14) is connected with the resin ejecting port (15) through a resin channel (22a) extending along the horizontal direction and a resin channel (22b) vertically extending perpendicular to the resin channel (22a). Compressed air in a compressor (7) is supplied to the air supply port (16) through pressure P1 lager than resin pushing pressure P0, to prevent liquid resin (2) from entering into the air supply port (16). The compressed air is ejected to the liquid resin (2) stored in the resin channel (22b) through pressure P2 larger than P1, and the residual liquid resin (2) in the resin channel (22b) can be extruded from the resin ejecting port, so that a certain amount of liquid resin (2) can be supplied to a die cavity (21).

An inkjet ink set containing a first pigment ink and a second pigment ink. The first pigment ink includes an anionic self-emulsification ether polyurethane, and the second pigment ink includes a styrene acrylic resin emulsion.

The invention provides a three-dimensional printing machine with a multi-dimensional motion workbench. The three-dimensional printing machine comprises a base, first rails, a first supporting frame, second rails, a second supporting frame, a telescopic rod, a workbench, a spraying head bracket, one or multiple printing spraying heads, one or multiple material boxes and the like, wherein the first rails are mounted on the base; the first supporting frame is mounted on the first rails and can move along the length direction of the first rails; the second rails are mounted on the first supporting frame and are perpendicular to the first rails; the second supporting frame is mounted on the second rails and can move along the length direction of the second rails; the workbench is mounted on the second supporting frame through the telescopic rod and can move in the height direction; the spraying head bracket is mounted on the base; the printing spraying heads are mounted on the spraying head bracket and are positioned above the workbench; the material boxes are mounted on the base; the printing spraying heads are connected with the material boxes in a one-to-one correspondence manner. The printing spraying heads of the three-dimensional printing machine are fixedly mounted, so that the continuity of printing material outputting is kept, and the printing effect can be enhanced.

For forming one dot by jetting a plurality of ink droplets, a drive pulse signal in an ink-droplet jetting apparatus includes a first main pulse for jetting, a first regulating signal which is inserted at a first interval from the first main pulse, and a second regulating pulse which is inserted at a second interval from the first main pulse. The first interval is almost the same as or more than the second interval. Accordingly, the ink-droplet jetting apparatus is capable of jetting the ink droplets stably, and printing at a high speed.

The invention discloses a tunnel portal section pre-reinforcement and excavation construction method based on partition blasting. The construction method comprises the following steps of 1, precipitation pre-reinforcement; 2, earth surface pre-reinforcement, and specifically, reinforcing the surface of a backfill section in a construction tunnel portal section through adopting a cement soil stirring pile; and 3, tunnel excavation construction, and specifically, carrying out excavation construction from rear to front in a plurality of excavation sections, wherein the process comprises the following steps of surveying and setting out, performing drilling and blasting construction, excavating an upper portal body, excavating a middle portal body and excavating a lower portal body. The construction method is reasonable in design, simple and convenient in construction and good in use effect; the underground water level is reduced through precipitation pre-reinforcement, and then surroundingrock is effectively reinforced; after the backfill section is subjected to surface pre-reinforcement through using the cement soil stirring pile, a three-step synchronous excavation mode is used forcarrying out partition blasting excavation, so that it is ensured that the tunnel excavation process is safe and reliable and a tunnel structure is stable.

The invention provides an air-assisted urea supply device used for a diesel engine. The air-assisted urea supply device used for the diesel engine comprises a urea storage box, an engine air storage cylinder and an engine exhaust silencer. The urea storage box is connected with an ejector through a urea pump, the ejector is communicated with the engine exhaust silencer, a filter is arranged between the urea storage box and the urea pump, an energy accumulator is further arranged at the output end of the urea pump, the engine air storage cylinder is communicated with the ejector through an air filter, a pressure reducing and stabilizing valve is further arranged between the air filter and the ejector, and the output end of the pressure reducing and stabilizing valve is further communicated with the input end of the urea pump. According to the scheme, the ejector of the device is simple in structure, good in the ejection effect and high in the accuracy and stability, urea crystals will not be generated in the ejecting process, and stable ejection can be achieved.

The invention relates to the technical field of electrospinning. A lotus seedpod electrospinning spray head comprises a casing, the bottom surface of the casing is an arc face, a solution inlet is formed in the top surface of the casing, a solution channel is formed in the casing, the bottom surface of the solution channel is an arc face, a plurality of conductor nozzles are evenly arranged on the bottom surface of the solution channel, the conductor nozzles extend out of the casing to form injection channels, a high-voltage electrode is further arranged on the bottom surface of the solution channel, the high-voltage electrode is electrically connected with the conductor nozzles, an air guide pipe is arranged in the casing and at the position under the solution channel, the air guide pipe is communicated with an external auxiliary air flow generator, upper through holes and lower through holes are formed in the upper surface and the lower surface of the air guide pipe, the conductor nozzles penetrate through the upper through holes and the lower through holes, the bore diameter of the lower through holes of the air guide pipe is larger than the outer diameter of the conductor nozzles, flow guide barrels are arranged at the edges of the lower through holes and at the peripheries of the conductor nozzles, and openings matched with the bottoms of the flow guide barrels are formed in the bottom surface of the casing. The method obviously improves electrospinning jet flow density and nano-fiber injection efficiency.

The invention provides a resin molding apparatus and a resin molding method. In the resin molding apparatus, liquid resin is equably injected at a specified amount from a plurality of nozzles. A resin injection mechanism (6) mounted at the front end of a distributor (1) comprises: a resin storage part (23) for storing the liquid resin (2); a plurality of resin channels (21), which are connected to the resin storage part (23) and extend along a horizontal direction; a plurality of resin channels (24) communicating with the resin channels (21) and extending along a vertical direction; and the plurality of nozzles (13) connected to the resin channels (24), respectively. The liquid resin (2) is supplied to and flows in the resin storage part (23), so that the liquid resin (2) can fill the resin storage part (23). The liquid resin (2) passes through the resin channels (21) extending along a horizontal direction from the top of the resin storage part (23), and through the resin channels (24) extending along a vertical direction from the resin channels (21) in sequence, and is injected towards each mold cavity (18) from the nozzles (13).