7results about How to "Control shape" patented technology

The utility model belongs to the technical field of polyethylene antibacterial film production, and discloses a blowing traction device for polyethylene antibacterial film production, which comprises a die head, an air ring arranged above the die head, a herringbone plate arranged above the air ring, a traction component arranged on one side of the herringbone plate, a plurality of annular air pipes arranged at equal intervals up and down, and a plurality of air pipes arranged at equal intervals up and down, a plurality of uniformly distributed adjustable air outlets are formed in the annular air pipe, the annular air pipe is connected with an air guide branch pipe, an air volume control valve is arranged on the air guide branch pipe, the air guide branch pipe is connected with an air guide main pipe, one end of the air guide main pipe is connected with a fan, an inlet of the fan is connected with a filter, the air ring is designed into multiple layers, and the air volume and the air direction of each layer can be independently controlled; by optimizing the distribution and action of each layer of wind, the cooling speed and shape of the film bubbles can be better controlled, and the transparency and mechanical property of the film are improved.

The utility model belongs to the technical field of dies, and particularly relates to a truck traction bearing base extrusion forging die with a reinforcing rib structure. The traction bearing base forging die comprises a traction bearing base forging upper die and a traction bearing base forging lower die, a die assembly convex part and an extrusion convex part are arranged in the traction bearing base forging upper die, a die assembly concave part and an extrusion concave cavity are arranged in the traction bearing base forging lower die, and the die assembly convex part and the die assembly concave part correspond to each other in position and are matched with each other in shape. The extrusion convex part corresponds to the extrusion concave cavity in position and is matched with the extrusion concave cavity in shape, a reinforcing rib synchronous forming structure is arranged in the extrusion concave cavity, and the reinforcing rib synchronous forming structure is right opposite to the extrusion convex part. In the forging process, the reinforcing rib can be formed through one-time forging by matching the unique reinforcing rib synchronous forming structure with the extrusion convex part, so that the production period is greatly shortened, and the production efficiency is improved.

The application discloses a planar vortex orbit angular momentum antenna based on artificial surface plasmons. The application comprises a resonant antenna and a feeding system; the resonant antenna comprises an artificial surface plasmon metal ring and a first dielectric plate; the feeding system comprises a second dielectric plate, an air dielectric layer, a metal ground, a third dielectric plate and a feeding network; two microstrip stubs are arranged on the third dielectric plate, and a small metal disc is arranged at the end of each microstrip stub; the microstrip stubs are connected with the feeding network through metal vias; the surface impedance of the slotted unit of each artificial surface plasmon unit in the artificial surface plasmon metal ring is the same or different. The application can emit a vortex wave beam carrying a precisely defined orbit angular momentum on a plane, and through synthesizing multiple wave beams at a fixed frequency, the multiple wave beams can be superimposed to form a new wave beam, so that the shape of the wave beam can be controlled. The wave beam scanning can be realized by adjusting the surface impedance distribution of each wave beam.

The present application relates to a kind of automobile engine fuel injection nozzle steel and its manufacturing method, belong to automobile steel technical field, the chemical composition mass percentage of the automobile engine fuel injection nozzle steel is C:0.47~0.54%, Si:0.10~0.37%, Mn:0.55~0.85%, Cr:1.00~1.30%, P:≤0.020%, S:0.009~0.015%, Ni:≤0.10%, Mo:0.16~0.26%, Al:0.012~0.038%, N:0.0025~0.0065%, Ti:≤0.0020%, the balance is Fe and inevitable impurities.By converter-refining-vacuum degassing-continuous casting-water tank quenching-heating-rolling-rolling heat preservation-on-line cooling and other process steps, obtain a kind of automobile engine fuel injection nozzle steel, steel non-metallic inclusion A fine ≤20um, A fine long / width ≤8;A coarse ≤25um, A coarse long / width ≤5, steel TiN size ≤5um.Any pearlite structure volume size is 300-450um 3 , evenly distributed between ferrite structure.

The application belongs to the technical field of catalyst material preparation, and provides a single-atom porous material catalyst, a preparation method thereof and application of the single-atom porous material catalyst in a methane aerobic conversion reaction. The application introduces reaction gas containing a gaseous metal precursor, a carbon source and a nitrogen source into a plasma reaction chamber, and uses plasma for chemical vapor deposition to obtain the single-atom porous material catalyst. The preparation method provided by the application can select gaseous, liquid or solid raw materials as a source of the gaseous metal precursor. The application can prepare various types of single-atom porous material catalysts, and enriches the application range of the single-atom porous material catalysts. The application realizes control of the particle size, morphology and distribution of the single-atom porous material catalyst by adjusting reaction parameters, and the prepared single-atom porous material catalyst can be used in the methane aerobic conversion reaction. Therefore, the preparation method provided by the application is simple in operation, strong in universality and has a good industrial application prospect.

The application discloses a kind of zeolite molecular sieve for removing hexavalent chromium in wastewater and its preparation method, which comprises the following steps: mixing solution and stirring: all raw materials are placed into polytetrafluoroethylene lined stainless steel autoclave, then the polytetrafluoroethylene lined stainless steel autoclave is placed into ultrasonic cleaning machine for ultrasonic stirring, and slowly shakes during stirring process;Synthesis reaction: after stirring, the polytetrafluoroethylene lined stainless steel autoclave is tightened, the polytetrafluoroethylene lined stainless steel autoclave is placed into thermostat for constant temperature reaction;Sample removal: after constant temperature, the polytetrafluoroethylene lined stainless steel autoclave is taken out, the cover is rotated after cooling, the white lining is taken out, and is dried, to obtain molecular sieve.The application can solve the problems of complex process flow, huge energy consumption and inconvenient operation in the synthesis technology of existing molecular sieve.

The application provides a preparation method of nano silver powder with single particle dispersion. The method aims at solving the problems of easy agglomeration, high impurity and high cost of nano silver powder in the prior art. The method comprises the following steps: preparing an oxidizing agent solution containing a high molecular carboxylic acid or a salt thereof, a reducing agent solution, and a bottom solution containing a dispersant and a silver ion release regulator respectively; adjusting the pH of the bottom solution, and adding the oxidizing agent and the reducing agent solutions at the same flow rate to react; then, the target product is obtained through flocculant sedimentation purification, cleaning, drying and air grinding. The method controls the release of silver ions and the reaction rate through the synergistic effect of the high molecular carboxylic acid or the salt thereof, the silver ion release regulator and the like, and realizes the single particle dispersion of the nano silver powder without a large amount of dispersant, and is suitable for the fields of electronic information, biomedicine and the like.