34results about How to "Effective control of uniformity" patented technology

A process for preparing millipore metallic film used for filter, separator, catalyzing, fluid distributor and mass or heat transfer includes such steps as providing a centrifugal drum with a porous substrate fixed on its inner surface, preparing slurry from raw powder, loading the slurry in the centrifugal drum, and high-speed rotating to centrifugally form a gradient millipore film on the inner surface of said porous substrate.

The invention proposes production equipment of a continuous fiber thermoplastic prepreg tape, which is used for solving the problems of nonuniform coating, weak infiltration effect and high waste rate in the production process of thermoplastic continuous fibers in the prior art. The production equipment of the continuous fiber thermoplastic prepreg tape comprises two sets of yarn placing racks symmetrically arranged, a tension adjusting device and a preheating dehumidifier, and further comprises a first coating mechanism, a second double-mold head bath infiltration mechanism, a rolling cooling device and a winding device. The production equipment of the continuous fiber thermoplastic prepreg tape infiltrates the internals of fibers through a first coating roller, uses the second double-mold head bath infiltration mechanism for infiltrating the outer surfaces of the fibers, can totally presoak the fibers, and can synchronously guarantee the uniformity of the tape through adjusting a gap between the bath infiltration mechanism and the coating roller.

The invention particularly relates to a novel magnesium alloy cast-rolling liquid transfer system device, and belongs to the technical field of magnesium alloy plate and strip cast-rolling unit equipment. The novel magnesium alloy cast-rolling liquid transfer system device aims at the defects that in a magnesium alloy cast-rolling liquid transfer system at present, the liquid level of a front box is instable, system temperature and flow control is inaccurate, maintenance is difficult, cast-rolling plate and strip solidification is quite prone to being uneven, and segregation, serious edge cracks, material losses and the like are prone to being formed. The system device comprises a servo liquid transfer pump with a lower-end conical hole cavity, a self-adaptive heat expansion liquid transfer pipe, a combined front box and multifunctional top cover, a flow accurate control blocking device, a liquid level and temperature closed-loop control system and the like. The magnesium alloy cast-rolling liquid transfer system device is safe, economical and convenient to maintain, the system is in butt joint with a standing furnace and an inclined cast-rolling machine conveniently and fast, and accurate control over the temperature and flow in the system is achieved. Guarantees are provided for improving the material quality and the yield of cast-rolling magnesium alloy plates and strips and reducing the cost, and wide application prospects are achieved.

The invention provides a method for preparing a modified Pt/C catalyst. The method comprises the steps that the Pt/C catalyst is immersed in an organic amine mixed solution to form a precursor mixture; the organic amine mixed solution comprises a component A and a component B, the component A is organic amine, and the component B is at least one solvent mutually solved with the organic amine; theprecursor mixture is stirred; and the precursor mixture is filtered through suction, a filter object is washed, and thus the modified Pt/C catalyst is obtained.

The invention discloses a washing system and washing method for accumulated salt of a power station steam turbine. The system comprises an auxiliary steam header or a start boiler steam source which communicates with a parallel connection inlet of temporary steam valves of a high-pressure cylinder and a medium-pressure cylinder through a temporary steam pipe, and a steam inlet which communicates with a buffer tank through an outlet valve of the auxiliary steam header or the start boiler steam source, and the temporary steam pipe, wherein a steam outlet of the buffer tank communicates with theparallel connection inlet of the temporary steam valves of the high-pressure cylinder and the medium-pressure cylinder through a temporary steam inlet valve; a temperature gauge and a pressure gauge are arranged on the temporary steam pipe of the steam outlet of the buffer tank, the temporary steam pipe of the steam outlet of the buffer tank further communicates with a temporary steam exhaust pipe, and a temporary steam exhaust valve is arranged on the temporary steam exhaust pipe; and a desuperheating water inlet of the buffer tank communicates with a desuperheating water pipe, and a desuperheating water valve and a desuperheating water pressure gauge are arranged on the desuperheating water pipe. The invention further discloses a washing method of the system. The system is simple in design, reliable and easy to realize, and solves the problems that salt accumulation of a steam turbine is caused due to leakage of a steam condenser and a unit cannot be loaded, of a coastal power plant.

The invention discloses a multi-point pressurizing device for controlling layer density and uniformity of a complex surface stitched fabric. The device comprises a male mold, a female mold and a multi-point pressurizing component, wherein the multi-point pressurizing component comprises an arched bracket and a pressurizing component; the arched bracket is arranged at the outer periphery of the female mold; the pressurizing component comprises a screw rod, a rotating handle and a rubber pad; the screw rod is in threaded connection to the arched bracket; one end of the screw rod penetrates through the arched bracket to extend to the outer surface of the female mold, and the other end is left outside the arched bracket; the rotating handle is connected to one end, left outside the arched bracket, of the screw rod; and the rubber pad is arranged at the end part of one end, extending to the outer surface of the female mold, of the screw rod. The multi-point pressurizing device for controlling the layer density and the uniformity of the complex surface stitched fabric is simple in structure, is easy to be machined and assembled, is convenient for use, and can effectively control the layer density and the uniformity of the complex surface three-dimensional fabric to improve the quality of the complex surface stitched fabric.

The invention relates to a salt bath heat treatment method for tool and mould steel, in particular to a salt bath annealing method for the tool and mould steel. The method has the advantages that thequality and the performance of the annealed structure of materials can be improved. The method comprises the following steps that 1) high-temperature salt bath treatment is carried out, specifically,the tool and mould steel is put in a salt bath with the temperature of 840-920 DEG C for heat preservation so as to enable the temperature of the tool and mould steel to be uniform; 2) isothermal saltbath treatment is carried out, specifically, the tool and mould steel subjected to high-temperature salt bath treatment in the step 1) in put in a salt bath with the temperature of 710-780 DEG C forisothermal treatment; and 3) air cooling is carried out, specifically, air cooling is carried out on the tool and mould steel subjected to isothermal salt bath treatment in the step 2) to reach the room temperature so as to obtain the tool and mould steel with the uniform structure. The tool and mould steel prepared through the method has the advantages of being uniform in structure, uniform in grain size and good in machining performance and using performance.

The invention discloses a core-shell structure catalyst, a preparation method of the core-shell structure catalyst and a membrane electrode containing the core-shell structure catalyst. The core-shell structure catalyst can be used for PEM hydrogen production but is not limited to the PEM hydrogen production. The core-shell structure catalyst is characterized in that IrxMyOz is used as an inner core, and the inner core is in a crystalline state; IrxMyOz is a shell layer, and the shell layer is of a dispersed amorphous structure; wherein M is selected from at least one of Pt, Pd, Au, Sn, Sb, Ti, Mn, Ru, Ni, W, Mo, Nb, Zr, Zn, Ta and Sr, in the formula, x/(x + y + z) is 31.6%-33.3%, and y/(x + y + z) is 0-1.6%. According to the core-shell structure catalyst, an outer shell layer structure is constructed on the surface of the noble metal oxide core through a deposition method that ultrasonic treatment cooperates with pH value control, and the core-shell structure catalyst has appropriate outer layer thickness and a synergistic effect of the inner layer and the outer layer, so the catalyst has high activity and high stability.

The invention discloses a low-heat-conductivity thermal insulation material and a preparation method and application thereof. The low-heat-conductivity thermal insulation material is prepared from the following components in parts by weight: 100 parts of straw powder, 180-300 parts of alcohol, 70-150 parts of water, 8-23 parts of orthosilicic acid, 30-90 parts of ester, 2-5 parts of a fire retardant, 1-3 parts of a mildew preventive, 10-30 parts of halide and 3-13 parts of oxalate. The low-heat-conductivity thermal insulation material has excellent low density, low heat conductivity coefficient, mold resistance and fire resistance; the preparation method has the advantages of being simple and feasible in production technology, low in production cost, abundant and cheap in raw materials and stable in process; the low-heat-conductivity thermal insulation material can be processed into a sheet, a panel or a filling body.

The invention relates to equipment and a process for reducing a threshing and redrying nicotine variation coefficient. The equipment for reducing the threshing and redrying nicotine variation coefficient is characterized in that the equipment comprises a conveying belt and a warehouse, an online near-infrared spectrograph is arranged above the conveying belt, an electronic belt scale is arranged below the rear end of the conveying belt, and the output end of the belt scale leads to the raw-tobacco formula stereoscopic warehouse. The equipment and the process have the advantages that manual material selecting and feeding in a preparation area are realized, uniformity of tobacco leaves in the preparation area before formula threshing and redrying is regulated effectively, and the nicotine variation coefficient of the preparation area for formula threshing and redrying production is reduced, so that the control capability for formula threshing homogenization level is improved, and product quality stability is guaranteed.

The invention discloses a preparation method and application of a tissue-controllable ultrahigh-purity cobalt plate. The preparation method comprises the following steps of cold-pressing molding, high-vacuum-degree vertical melting, high-vacuum-degree electron beam smelting furnace, argon chamber stainless steel wrapping, pass forging deformation amount and total deformation amount coordinately-controlled three-dimensional high-speed equal-temperature hot forging cogging, variable-angle cross-control rolling and heat treatment, turning machining, packaging and the like. The prepared ultrahigh-purity cobalt purity is greater than or equal to 99.995%, the average grain size is 10-40 microns, the beta-Co content of the fcc structure in the plate is more than 50%, the magnetic permeability isgreater than 70%, and the magnetic permeability non-uniformity is less than 1%. According to the preparation method, the grain size and the grain size distribution of the finished product can be effectively controlled, and the tissue distribution of the finished product is regulated and controlled, so that the raw material guarantee is provided for the finished product to be used as the high-quality target material.

The invention discloses preparation equipment and a preparation method of a sputtering target material. The preparation equipment comprises a closed cavity, a smelting and pouring device, a casting and forming device and an atmosphere treatment device; the smelting and pouring device and the casting and forming device are positioned in the closed cavity; the atmosphere treatment device is connected with the closed cavity through a pipeline; and a protective atmosphere is conveyed to the closed cavity. Through the combined action of the smelting device, the casting and forming device and the atmosphere cleaning device, unnecessary pollution caused by processing links in the smelting, stirring, cooling and molding processes is reduced, good conditions such as proper temperature, cooling speed, pressure and atmosphere are provided for material preparation, the impurity content of the prepared high-purity material can be effectively controlled in the whole preparation process, and the high-purity material can be uniformly fused and controllably cooled and formed.

The invention belongs to the technical field of shoe manufacturing, and provides a foaming agent injecting device of a shoe sole foaming machine. The agent injecting device comprises a frame (1), a nozzle (8), and a plate I (3) and a plate II (4) for driving the nozzle to move, wherein the nozzle (8) is located on a nozzle fixed mount (7); the nozzle fixed mount (7) is connected with the plate II (4); the plate II (4) is located on a slide rail II (6) of the plate I (1) and arranged vertically to the plate I (3); a guide wheel (9) arranged on one end of the plate II (4) is located in a mold hole (16) of a mold board (2) and elastically props against the wall of the mold hole of the mold board; and the guide wheel (9) is driven by the plate I (3) and the plate II (4) to perform horizontal and vertical composite motions along the motion trail limited by the inner wall of the mold hole of the mold board (2). By the foaming agent injecting device, the foaming agent nozzle can inject a foaming agent to a bottom mold along the motion trail limited by the mold hole of the mold board, so that the production efficiency and the production quality can be improved, and the waste of materials can be reduced to a certain extent.