33results about How to "Reduce scour erosion" patented technology

The invention discloses a method for simulating soil slope instability induced by groundwater. The method is characterized by comprising the following steps: a, putting a physical model on a centrifugal machine; b, raising the height of an external water tank, opening a water outlet valve and a water inlet valve, carrying out water seepage into a soil layer according to the thickness of a saturated soil layer and completing the saturation process of a soil mass; c, closing the water inlet valve, reducing the height of the external water tank, improving the centrifugal acceleration to solidifyand disperse the internal pore water pressure of the physical model; d, after the solidification is finished, opening the water inlet valve, raising the height of the external water tank to the corresponding height according to the preset water level height of an internal water tank; obtaining different infiltration capacity of the water to the slope when the water in the internal water tank seepsinto the soil layer and stays at different heights, and observing the wetting front change and the slope deformation condition of the physical model. The method disclosed by the invention has the advantages that the height of the groundwater level can be accurately adjusted in real time and washing of water current to the slope body is prevented; in the whole test process, high operability, highreliability and good test effect are realized.

The invention relates to a water conservancy retaining wall structure capable of preventing water and soil loss. The water conservancy retaining wall structure comprises a retaining wall body, whereinenergy dissipation assemblies and connecting assemblies are arranged on one side of the retaining wall body; a plurality of energy dissipation assemblies are arranged at intervals in the height direction of the retaining wall body; the two connecting assemblies are are respectively arranged on both ends of the energy dissipation assemblies; the energy dissipation assemblies comprise first energydissipation plates and second energy dissipation plates which are hinged to one side of the first energy dissipation plates; the connecting assemblies comprise first sliding blocks which are hinged tothe ends of the first energy dissipation plates and second sliding blocks which are hinged to the ends of the second energy dissipation plates; connecting strips are respectively arranged on the bothends of the energy dissipation assemblies; chutes are formed in the connecting strips; the first sliding blocks and the second sliding blocks which are located on the same ends of the energy dissipation assemblies are arranged in one chute in a sliding mode; and connecting springs are respectively arranged between one groove wall of the chute and the first sliding block as well as between the other groove wall of the chute and the second sliding block. The water conservancy retaining wall structure has the effect of increasing the structural stability of a retaining wall.

The invention relates to a composite sewing thread of a silk and yarn covering structure. The sewing thread is prepared by using polytetrafluoroethylene filaments as covering yarn core wires, using yarn with performance the same as or similar to or complementary to performance of filtering material surface layer fiber as the covering yarn, forming covering yarn through a covering technology, using the covering yarn as plied yarn and then conducting cabling and plying. Due to hairness of the covering yarn, more dust escaping through needle holes can be intercepted, and meanwhile the yarn layer has certain elasticity and can more compactly block the filter bag sewing needle holes, thereby improving the dust removing efficiency of a filter bag. Due to the covering effect of yarn, polytetrafluoroethylene filaments poor in wear resistance are protected, and the sewing thread has higher wear resistance.

The invention provides a high-temperature alloy floating wall tile pressure-regulating precision casting method under the action of an external electromagnetic field. The method comprises the following steps that printing is carried out by adopting a 3D printing technology to obtain a wax mould of a pouring system; the wax mold is atomized, polished and ground, and surface texture of the wax moldis removed; a multilayer shell is prepared on the wax mold; the shell is demolded; high-temperature alloy melt is poured into the shell by adopting vacuum counter-gravity pressure regulation to form acasting, an alternating electromagnetic field is added in the casting process of the casting, the electromagnetic volume force in the filling and solidification processes plays a stirring role on thehigh-temperature alloy melt, forced convection is generated to change the temperature field and the concentration field of the high-temperature alloy melt, and grains are refined. The high-temperature alloy floating wall tile pressure-regulating precision casting method is matched with a pressure regulating casting device, the alternating electromagnetic field is applied in the process of castingfilling and solidification, the effect of electromagnetic stirring forced convection is realized, the metallurgical quality of castings is improved, internal defects are reduced, and the density is improved.

The invention relates to a method of prolonging the service life of an oxygen lance of a converter. The method comprises the following steps: carrying out treatment on bottom end surface of a spray head of the oxygen lance and treatment on side wall of an oxygen lance body, coating a high-temperature-resistant antioxidant coating to the bottom end surface of the spray head of the oxygen lance, carrying out induction heating or flame heating treatment on the end surface, spraying a first layer with a coal gas type flame high pressure spray gun, and spraying a second layer with an oxygen-acetylene flame high pressure spray gun; derusting the side wall of the gun body to a range 2-10 m far from the bottom end surface by taking the bottom end surface of the spray head of the oxygen lance as the starting point, and then smearing a coating; and spraying boron nitride powder to the coating by using the oxygen-acetylene flame high pressure spray gun. The method has the advantages that the service life of the oxygen lance is prolonged, and the labor intensity of workers is alleviated to a great extent; the deslagging treatment time as slag is attached to the oxygen lance is saved, the blowing rhythm is more compact, the effective operating efficiency of the converter is increased, and the output of steel is improved.

The invention discloses high-cleanliness spring steel and a production method thereof. The production method comprises the following steps: pretreatment: desulfurizing molten iron until the content of S in the molten iron is less than or equal to 0.0015%; mixing the molten iron and waste steel into molten steel, carrying out desiliconization, dephosphorization and oxygen blowing decarburization, obtaining the molten steel with the temperature of 111011110 DEG C, the C content of 0.1010.15%, the O content of smaller than or equal to 0.045%, the P content of smaller than or equal to 0.011% and the S content of 0.00110.008%, carrying out slag stopping tapping, carrying out deoxidation alloying, and the flow of argon blowing at the bottom of a steel ladle during tapping and the flow of argon blowing at the bottom of the steel ladle after tapping are 80011000 NL/min and 1001200 NL/min respectively; refining the molten steel to adjust chemical components and inclusions, and the flow rates of the argon blowing at the bottom of the steel ladle are respectively 1001500 NL/min, 2001100 NL/min and 501100 NL/min in other time when slag charge adding and alloying treatment are carried out and the temperature is increased by electrifying; then carrying out vacuum refining and vacuum breaking soft stirring in sequence, and the flow of the argon blowing at the bottom of the steel ladle is 20150 NL/min and 501100 NL/min; and casting into a steel billet. In the high-cleanliness spring steel prepared through the production method, the density of inclusions with the size larger than 5 micrometers is smaller than or equal to 0.5pcs/mm < 2 >, the length-width product of the maximum inclusions is smaller than or equal to 900 micrometers < 2 >, and the high-cleanliness spring steel has high cleanliness.

The invention discloses a multi-air-channel stopper rod, and relates to the technical field of stopper rods. The multi-air-channel stopper rod comprises a stopper rod body and a stopper rod head, the bottom of the stopper rod body is connected with the stopper rod head, the stopper rod body comprises a stopper rod shell and a rod core, and the rod core is nested in the inner layer of the stopper rod shell; a main channel and a branch channel are arranged in the rod core, and the two ends of the main channel are connected with the argon inlet hole and the stopper rod head respectively. A side channel is arranged in the stopper rod shell, and one end of the branch channel is connected with the argon inlet hole and communicated with the side channel. According to the plug rod, the restraining effect on confluence vortexes generated at the water gap can be achieved, the space utilization rate of the plug rod is further increased by further developing the design of an existing plug rod, and argon blowing can be conducted more flexibly.

The invention discloses a water ecological restoration system and method for a tidal tributary estuary of a dam-back dehydration reach. The system comprises a first bank slope type wetland, a second bank slope type wetland, a first overflow type wetland, a second overflow type wetland, a first group of wetland hydrological branches, a second group of wetland hydrological branches and gates. According to the invention, the problems that the existing wetland layout about the branch water return area mostly adopts a single wetland type when the wetland technology is used, and the function is relatively single are solved.

A tundish control flow method of a small square billet continuous casting stopper rod belongs to the technical field of steel casting. An upper water gap and a middle water gap are closely abutted with each other and arranged in a tundish nozzle pocket brick from top to bottom, wherein a zirconium core is embedded into the middle water gap; a tundish water gap of a lower water gap, which is closely abutted with the middle water gap, is arranged below the tundish nozzle pocket brick, and a zirconium core is also embedded into the lower water gap; a part of the upper part of the tundish nozzle pocket brick, which is matched with the upper water gap, is in a reverse cone cylinder shape, and a part of the lower part of the tundish nozzle pocket brick, which is matched with the middle water gap, is in a cone cylinder shape with a smaller cone angle; center lines of the upper water gap, the middle water gap and the lower water gap are overlapped; the outside diameter of the zirconium core embedded into the middle water gap is larger than that of the zirconium core embedded into the lower water gap, and the inside diameter of the zirconium core embedded into the middle water gap is larger than or equal to that of the zirconium core embedded into the lower water gap; and the tundish control flow is realized by adjusting a spacing between a stopper rod arranged on the upper water gap and the upper water gap and changing the lower water gap. In the invention, integral stopper rod control flow and diameter fixing water gap control flow are organically combined, therefore, the control flow effect is good.

The invention relates to a limestone powder porous cement concrete material for a dock chamber bottom plate drainage cushion layer and a preparation method thereof. The limestone powder porous cementconcrete material is composed of low-heat cement, fly ash, limestone powder, a polymer emulsion, 10-20mm broken stone, water and a water reducing agent. The limestone powder porous cement concrete material is adopted as the dock chamber bottom plate cushion layer, and the porosity is large, the limestone powder porous cement concrete material is convenient to accumulate and discharge water broughtby ships going in and out of docks, reduces water pressure and scouring damage borne by walls and pavement structures, increases a preliminary aggregate wetting step in the limestone powder porous cement concrete material preparation process, facilitates full coating of slurry on the surface of aggregate, has good mixture working performance, and is convenient for construction and maintenance, proper limestone powder is matched with low-heat cement, so that the mechanical properties of the porous concrete are improved, the porous concrete is durable and applicable, and the limestone powder iseasily available in production, low in price and convenient to popularize and use.

The invention discloses a top-blowing oxidation reduction method for a refining furnace, which comprises the following steps: firstly, inserting a top-blowing spray gun into the refining furnace from a spray gun hole of a refining furnace body through a lifting device, and then connecting the top-blowing spray gun with a gas supply metal hose to complete equipment installation; when crude copper melt enters a refining furnace, a top-blowing spray gun is used for blowing oxygen for combustion supporting and heat preservation, when the crude copper melt in a furnace body of the refining furnace reaches 300 t or above, a crude copper melt sample is taken for oxygen and sulfur content analysis, needed oxidation time and gas flow are calculated, then compressed air and oxygen-enriched air are introduced into the top-blowing spray gun for oxidation, and after oxidation is finished, oxygen and sulfur in the top-blowing spray gun are removed. Natural gas is introduced through the top-blowing spray gun for top-blowing reduction, and after reduction is finished, the top-blowing spray gun is switched to be subjected to heat preservation. According to the top-blowing redox technology, the use frequency of redox mouth and furnace mouth bricks is reduced, the service life of the bricks in a vulnerable area is prolonged, efficient and long-period stable operation of the refining furnace is achieved, the frequency of overhaul and maintenance is reduced, and materials and overhaul cost are saved.

The invention proposes a RH method vacuum tank with a lifting gas pipeline and an arrangement method of the lifting gas pipeline thereof. The RH method vacuum tank comprises a vacuum tank and at least one lifting pipeline, wherein the vacuum tank is vertically placed, and the bottom thereof is inserted with two dipping pipes; the two dipping pipes are parallel to each other, and are respectively communicated with an inner cavity of the vacuum tank; the lifting pipeline is vertically arranged on the outer side of the vacuum tank, and the lower end thereof is communicated with two branch pipelines; valves are respectively mounted on the two branch pipelines; and free ends of the two are correspondingly communicated with the two dipping pipes. The arrangement method comprises the following steps: (S1) two dipping pipes are mounted at the bottom of the vacuum tank vertically placed, and are communicated with the inner cavity of the vacuum tank; (S2) at least one lifting pipeline is vertically arranged on the outer side of the vacuum tank; the lower end of the lifting pipeline is communicated with two branch pipelines; and the valves are respectively mounted on the two branch pipelines; and (S3) the free ends of the two branch pipelines are correspondingly communicated with the two dipping pipes. The RH method vacuum tank can prolong the material resisting life of the lower part thereof.

The invention provides an inner structure of a high-efficiency energy-saving aluminum and aluminum alloy isothermal smelting furnace, a partition wall is arranged at the middle part of a hearth, the hearth is divided into a furnace starting melting region and a heating region through the partition wall, a feeding well and a circulating pump are arranged outside a furnace body, the inlet of the circulating pump is communicated with the hearth of the heating region, the outlet of the circulating pump is communicated with the feeding well, the feeding well is communicated with the hearth of the furnace starting melting region, the partition wall is provided with an inclined surface with an inclination angle of 3 to 20 degrees, a guiding region is arranged at one end of the partition wall, and the guiding region is arranged between the furnace starting melting region and the heating region and is in the shape of a spindle-shaped small-curvature arc. When in working, an aluminum liquid in the furnace starting melting region passes through the guiding region and enters the heating region in a more advantageous flowing state. The inner structure of the aluminum and aluminum alloy isothermal smelting furnace enhances the heat exchange between the aluminum liquid and a heater, reduces the scouring erosion of the aluminum liquid to a wall surface and enables the temperature to be more uniform by adjusting the flowing direction of the aluminum liquid in the heating region.