Abstract: An optimization design method for a spatial flow passage of a low-pressure even spray nozzle, relating to a design method for an essential apparatus in a water-saving irrigation system, such as a spray irrigation system. Specifically, if the model and the inlet diameter of a nozzle are determined, the shape and the size of the cross section of an outlet, a flow passage deflection angle, the radius and the arc length of a flow passage contour, and the size of an elevation angle of the outlet are determined to implement structural optimization of a spatial flow passage of the nozzle; moreover, parameterization design of the spatial flow passage in different inlet diameter conditions is implemented, so that a method for determining structural parameters of a spatial flow passage of a nozzle is obtained. A design method of a spatial flow passage under a low-pressure operation condition is developed, such that the hydraulic performance of the nozzle is optimized, and the nozzle is efficient and saves energy.

Abstract: A detachable frame of a light-small sprinkling machine includes angle steel pieces, tiepieces, support bars, support upright rods, top rod with slots, and wheels. The components of the frame are connected through threaded connections, so that the frame can be disassembled and removed easily. The distance between sprinkler heads and the mounting height of the sprinkler heads may be changed by means of free movement of turning hooks in the top rod with slots. The number of spans of the rod of the machine are be selected according to the topographic structure and can be changed by means of threaded holes in the two ends of the top rod with slots, and thereby the length of the rod can be changed. Employing low-pressure sprinkler heads and utilizing the turning effect of movable swivel shafts, the irrigation sprinkling machine can be turned to any direction freely.

Abstract: A detachable frame of a light-small sprinkling machine for precise irrigation, which belongs to a key equipment in modern agricultural irrigation. The detachable frame of a light-small sprinkling machine for precise irrigation comprises angle steel pieces, tiepieces, support bars, support upright rods, top truss with slots, and wheels, wherein, the components of the frame are connected through threaded connections, so that the frame can be disassembled and removed easily. The distance between sprinkler heads and the mounting height of the sprinkler heads may be changed by means of free movement of turning hooks in the top truss with slots. The number of spans of the truss of the machine can be selected according to the topographic structure and can be changed by means of threaded holes in the two ends of the top truss with slots, and thereby the length of the truss can be changed. The irrigation sprinkling machine has high adaptability, and achieves even sprinkling distribution.

Abstract: An automatic control element has a sprinkler, a fluidic element connected to the sprinkler, and an outlet cover plate secured onto an outlet of the fluidic element. The fluid element further has a water inlet and a first air supply pore are symmetrically arranged on it. A second air supply pore is on the water inlet. A water distributor is formed on the sprinkler, a water tank is provided on the outer side of the sprinkler, and the water distributor is in communication with an inner cavity of the water tank. A signal nozzle is provided on the wall of the water tank, and the signal nozzle is connected to the water inlet via a conduit.

Abstract: An injecting body of the injector is provided with two outlets. One outlet is connected to an auxiliary nozzle in a threaded manner, and the other outlet is connected to an injecting element body in a threaded manner. The water taking signal nozzle circularly takes signal water and air conveniently and reliably, so that a low-pressure vortex region is discontinuously formed at one side of the injecting element body; formation and disappearance of a pressure difference between a left cavity and a right cavity can be implemented in an automatic control manner, and wall attachment of water and rotation of the injector are implemented. The auxiliary nozzle is primarily used for supplementing near water distribution of the double-nozzle injector capable of spraying at a medium and low pressure, so as to improve spraying evenness.

Abstract: A device and a method for laser-inducing cavitation strengthening with multi-system automatic coordination work. The device comprises a plurality of systems, including a clamping system, a lifting system, an imaging system, a computer control system, a laser system and an energy density amplifying system, etc. The device for laser-inducing cavitation strengthening comprises a laser cavitation device and a fixing platform. A water channel is formed in the fixing platform. A cushion block is equipped in the water channel. The wall of the water channel is provided with a temperature sensor. The temperature sensor is connected with a computer. The fixed platform is arranged on a lifting device. The lifting device is located on a two-axis coupling platform. The laser emitted by the laser cavitation device passes through the sidewall of the water channel to be focused in the water channel. The laser cavitation device is connected with the computer.

Abstract: A method and apparatus for nanocrystallizing a metal surface by laser-induced shock wave-accelerated nanoparticles. The apparatus comprises a control system, a light guiding system, a workbench control system and an auxiliary system, wherein the auxiliary system comprises an air compressor, a paint feeder device, a nanoparticle nozzle, a powder feeder device, an exhaust, a sealed working chamber and a metal nanoparticle recycler device. The method comprises the following steps: pre-processing and fixing a workpiece; activating the air compressor to feed a powder; controlling and adjusting the paint feeder device to eject a black paint; transmitting a high-power pulse laser beam; recycling excess metal nanoparticles; and rinsing non-vaporized/ionized black paint off a surface of the workpiece.

Abstract: A method and apparatus for acquiring a nanostructured coating on a metal surface by using an intense shock wave generated by continuous explosion of a laser-induced plasma is provided. The method comprises: irradiating a laser beam on a black paint surface of an upper opening of a high pressure resistant glass pipe having a black paint strip arranged therein; the black paint absorbing the light energy and producing a plasma; generating an initial plasma explosion shock wave; transmitting the initial plasma explosion shock wave in the high pressure resistant glass pipe; generating a plasma cloud reaching a lower opening of a glass catheter; and, the shock wave pressure outputted embedding nanoparticles into a surface of a workpiece. The apparatus comprises the high pressure-resistant glass pipe with a zigzagging switchback shape or a spiral and inverted cone shape.

Abstract: A double-nozzle injector capable of spraying evenly at a medium and low pressure. An injecting body of the injector is provided with two outlets. One outlet is connected to an auxiliary nozzle in a threaded manner, and the other outlet is connected to an injecting element body in a threaded manner. A cover plate is fixedly mounted at a top end of the injecting element body. A mounting hole used for connecting a threaded rod is disposed on the cover plate. The other end of the threaded rod is connected to a connector in a threaded manner. A water taking signal nozzle is disposed in a round through hole of the connector. A bolt is used for fixing the disposal location of the water taking signal nozzle to make the water taking signal nozzle fixed above an outlet of the cover plate.

Abstract: The present invention discloses an automatic control element with uniformly-distributed stepping frequency, comprising a sprinkler and a fluidic element connected to the sprinkler, an outlet cover plate being secured onto an outlet of the fluidic element. A water inlet and a first air supply pore are formed symmetrically on the fluidic element, and a second air supply pore is formed on the water inlet. A water distributor is formed on the sprinkler, a water tank is provided on the outer side of the sprinkler, and the water distributor is in communication with an inner cavity of the water tank. A signal nozzle is provided on the wall of the water tank, and the signal nozzle is connected to the water inlet via a conduit.