48results about How to "Significant technological advancement" patented technology

The invention relates to a new method for manufacturing a composite coating shell for precisely casting fusible patterns, and belongs to the field of precise casting. The method comprises the following steps: using water-based ethylsilicate-silica sol as a mixed binder, preparing mixed binder paint by mixing the mixed binder with refractory powders and a curing agent, painting the mixed binder paint on the surface of a fusible pattern to form a monolayer or multilayer coating bottom layer, and sequentially painting a monolayer water glass binder paint transition coating and a multilayer waterglass binder paint enhanced coating on the bottom layer, thereby forming the composite coating shell for precisely casting the fusible pattern, wherein the composite coating shell consists of a mixedbinder coating bottom layer and a water glass binder coating enhanced skin coat. The invention solves the manufacturing difficult points of the shells with complicated inner cavities, deep blind holes and deep groove parts and the problems of slow drying, long production periods, low quality and the like of the shells existing in a precise casting trade for a long time, comprehensively improves the quality of precision castings, markedly reduces the production cost, is favorable for environment protection and is a creative breakthrough for a traditional technique in the field.

The invention discloses a method for rocky mountain soil dressing storage expanding afforestation. The method comprises the steps that firstly, a special-shaped pit is dug, then, soil dressing replacement is performed and a biological storage expanding bulking agent is added into the special-shaped pit, meanwhile, supplemental irrigation water source preparation is performed, and finally, nursery stock preparation, nursery stock transplanting, rooting strengthening treatment and coverage water retention serial measures are performed to complete a rocky mountain storage expanding afforestation ecological project. The rocky mountain protoclastic granular structure can be improved, the soil reservoir effective storage is increased, the soil water storage capacity is enlarged, rainfall effectiveness and seedling drought resistance are enhanced, the natural rainfall storing and adjusting functions of a soil reservoir are brought into full play, the survival rate of rocky mountain difficulty site afforestation is increased, forest resource cultivation is accelerated, and the mountainous ecological environment is improved.

The invention discloses a riser self-tensioning type underwater production support buoy and a mounting and recycling method thereof. The riser self-tensioning type underwater production support buoy comprises an outer layer buoy and inner layer buoys, wherein the plurality of inner layer buoys are embedded in the outer layer buoy. As the outer layer buoy is in charge of providing a tensioning force of a mooring cable and the inner layer buoys provide top tensioning forces of rigid risers, the riser self-tensioning type underwater production support buoy can conveniently provide desired top tensioning forces of the rigid risers and the mooring cable at the same time; and requirements of practical engineering application can be only satisfied by using the riser self-tensioning type underwater production support buoy in a super deep water ocean oil and gas engineering development system. As vertical motions and stresses of the rigid risers and the outer layer buoy are decoupled, the stress and motion amplitudes of the rigid risers can be reduced to be the benefit of improving the strengths and fatigue performances of the rigid risers. When the buoy is biased, secondary distribution of the top tensioning forces among the rigid risers can be avoided to be the benefit of improving the strengths and fatigue performances of the rigid risers so that the rigid risers satisfy use requirements.