8results about How to "Change particle size" patented technology

The invention discloses a preparation process of a cefpodoxime mother nucleus 7-AMCA, and relates to the technical field of 7-AMCA. According to the technical scheme, the method comprises the following steps: adding dimethyl carbonate and a boron trifluoride-dimethyl carbonate complex into a reaction bottle A, and dropwise adding an alkylation reagent; adding D-7ACA, and reacting at room temperature; adding purified water, sodium pyrosulfite and edetate disodium into the reaction bottle B; transferring the feed liquid in the reaction bottle B into a reaction bottle A, adding an organic solvent into the mixed liquid at room temperature, and extracting and separating the liquid to obtain a water phase; dropwise adding an alkaline solution into the water phase, adjusting the pH value to 2.8-3, and cooling to grow crystals; dropwise adding an alkaline solution, adjusting the pH value to 4.5-5.2, and cooling to grow crystals; and filtering out mother liquor, washing to be colorless, leaching by using an organic solvent, pumping, and drying in vacuum to obtain the cefpodoxime mother nucleus 7-AMCA. According to the invention, D-7ACA is taken as a starting raw material, the process flow is improved, the preparation process of 7-AMCA is optimized, and the purposes of improving the product quality and increasing the yield are achieved.

The utility model relates to the technical field of flour mills, and discloses a hammer type flour mill which comprises a machine body, a flour milling chamber and a collecting chamber are arranged in the machine body, a discharging port is arranged between the flour milling chamber and the collecting chamber in a communicating mode, a plurality of milling teeth are arranged on the inner wall of the flour milling chamber in an array mode, a rotating shaft is arranged in the flour milling chamber in a rotating mode, and a motor is fixedly arranged on the outer wall of the machine body and connected with one end of the rotating shaft. Each hammering assembly comprises a plurality of sleeves fixedly arranged on the rotating shaft, hammer rods are slidably inserted into the sleeves, sliding plates are arranged at the ends, located in the sleeves, of the hammer rods, hammer heads are fixedly arranged at the other ends of the hammer rods, a plurality of positioning holes are formed in the sleeves in an up-and-down symmetrical mode, and positioning grooves are formed in the sliding plates. The sliding plate penetrates through the positioning hole through a fixing bolt and is inserted into the positioning groove to be fixedly connected with the sleeve. The hammer rod can be adjusted in the sleeve in a sliding mode, so that the distance between the hammer head and the grinding teeth is changed, the device can adapt to material grinding under different hardness and humidity conditions, and the grinding efficiency is improved.

This invention provides a device and method for simulating sediment resuspension under hydrodynamic action, relating to the field of sediment simulation. Addressing the problem that current wave-generating simulations of dynamic disturbances easily lead to the breakage of suspended particles, this invention simulates the action of water flow in a natural river by installing baffles within the water tank cavity to form multiple flow channels. The segmented circulation of water flow simulates the sediment resuspension process. When the grid blades agitate the water, the grid structure divides the water flow into multiple smaller streams, thus dispersing the force of the water flow. The originally concentrated impact force is dispersed to various parts of the grid, and when it is transmitted to the suspended particles, the magnitude and concentration of the force are significantly reduced, preventing the particles from breaking due to excessive external force.

The invention relates to a preparation method of block polymer nanoparticles. According to the invention, the quercetin and the pH-sensitive polymer are coated with the PLGA block polymer through an emulsion polymerization method, the pH-sensitive polymer is prevented from premature degradation of the nanoparticles, and the chitosan is used as the outer layer of the nanoparticles; under the combined action of the PLGA block polymer, the pH sensitive polymer and the chitosan, the drug release rate of the nano-particles when the pH value is 1.2 is reduced, so that the nano-particles have lower drug release rate and lower cytotoxicity.

The utility model discloses dust removal equipment with an energy-saving mechanism, which comprises an equipment body and a dust removal pipe arranged on one side of the equipment body, and further comprises a treatment mechanism arranged on the dust removal pipe and used for treating large-particle impurities in dust, the treatment mechanism comprises a treatment plate which is fixedly connected to the inner wall of the end, close to the mechanical equipment or the workshop needing dust removal, of the dust removal pipe, and a plurality of through holes are formed in the treatment plate. Through the arrangement of the treatment mechanism, under the action of the crushing mechanism, large-particle impurities are ground and crushed into small-particle impurities, and the particle size and weight of the impurities are changed, so that the impurities can flow to the equipment body to be filtered and collected under the action of airflow; therefore, large-particle impurities can be collected without additionally increasing the power of the equipment body, the dust-containing gas treatment effect is guaranteed, meanwhile, the power output and the use cost of the equipment body are reduced, and the energy-saving effect is achieved.

The utility model belongs to the technical field of granulators, and particularly relates to a granulator with an adjustable die hole diameter, which comprises a material extruding mechanism, a die hole diameter adjusting mechanism and a die hole diameter adjusting mechanism, the forming die comprises a material receiving plate, a discharging plate and a plurality of diameter adjusting mechanisms; the rotary cutting mechanism is located on the outer side of the discharging plate so as to cut off the raw materials extruded by the diameter adjusting mechanism; the diameter adjusting mechanism comprises a plurality of telescopic pipes which are sequentially arranged in a stacked and sleeved mode. The telescopic pipes are connected end to end to form a tower shape, the upper ends of the telescopic pipes are connected with the receiving plate, and the lower ends of the telescopic pipes are connected with the discharging plate; the discharging plate is suitable for selecting the corresponding telescopic pipe as a discharging end through lifting; the telescopic pipes of the diameter adjusting mechanism of the granulator with the adjustable die hole diameter are in a tower shape in the initial state, the formed particle size is the largest at the moment, when the particle size needs to be reduced, the material receiving plate is lifted, the telescopic pipes are sequentially folded from bottom to top, the corresponding telescopic pipes can be selected as discharging ends, and the effect of changing the particle size is achieved.

The utility model relates to the technical field of extrusion forming equipment, and discloses a puffed food extrusion forming die head which comprises a machine body, a first motor is fixedly connected to the left end of the machine body, a feeding port is fixedly connected to the left side of the upper portion of the machine body, and an extrusion rod is rotationally connected to the interior of the machine body. The left end of the extrusion rod is fixedly connected to the driving end of the first motor, a first connecting block is fixedly connected to the right side of the machine body, a second motor is fixedly connected to the top of the first connecting block, a first gear is rotationally connected to the upper portion of the interior of the first connecting block, and the left side of the first gear is fixedly connected to the driving end of the second motor. The periphery of the first connecting block is rotationally connected with a first fluted disc. According to the rapid die head mounting and replacing device, through cooperation of the first connecting block, the first fluted disc, the first gear, the second motor, the two first sliding rods, the two clamping plates, the multiple connecting rods, the two first sliding blocks, the two second sliding rods and the second connecting block, the rapid die head mounting and replacing function is achieved.

The present invention discloses a construction waste recycling device for reducing construction costs, and relates to the technical field of construction waste recycling. It comprises a lower frame, an upper frame is fixedly connected to the upper side of the lower frame, a symmetrically distributed first rotating shaft is rotatably connected to the upper side of the upper frame, a second rotating shaft is commonly fixedly connected to the eccentric parts of the opposite sides of the symmetrically distributed first rotating shaft, the second rotating shaft is rotatably connected to a movable jaw plate, a fixed jaw plate is fixedly connected in the upper frame, and the opposite sides of the movable jaw plate and the fixed jaw plate are respectively slidably connected to a first movable tooth plate and a second movable tooth plate. The present invention drives the first movable tooth plate to move back and forth through the inclined annular groove on the first rotating shaft, thereby rubbing the concrete between the first movable tooth plate and the second movable tooth plate, and avoiding damage to the first movable tooth plate and the second movable tooth plate due to the two ends of the steel bars in the concrete hitting the first movable tooth plate and the second movable tooth plate.