152results about How to "Uniform size" patented technology

The utility model relates to the technical field of cake production, and disclose a kind of cake production segmented device, including support seat, the support seat top is provided with conveying table, the conveying table top is provided with segmented mechanism, the support seat right side is rotatably connected with guard door, the support seat inside is provided with cleaning mechanism, the segmented mechanism includes support frame, the support frame is fixedly connected in conveying table top, the support frame top is fixedly connected with hydraulic cylinder, the hydraulic cylinder bottom is fixedly connected with fixed frame, the fixed frame top is fixedly connected with limit rod, the fixed frame is fixedly connected with fixed rod in, when using, when cake needs to be segmented in the process of production, first, cake is placed on conveying table to be transported, and make cake at the middle position of conveying table top, hydraulic cylinder drives fixed frame to move down, drive slitting knife to segment operation to cake.

The utility model relates to moxa stick processing technical field, concretely is a kind of cutting device for moxa stick processing, including base, fixed mounting is equipped with fixed frame on the base upper surface, work, first moxa stick is placed in the inside of curved groove one of bearing platform surface, before cutting, push cover plate, and the curved block under cover plate slides in curved groove one, moxa stick is pushed to specified cutting position, hand wheel is rotated to drive threaded lead screw rotation, threaded lead screw drives fixed link to move down, using the cooperation of curved groove two and curved groove one, moxa stick is firmly fixed, then, through handle lever, lever drives mandrel and gear rotation, gear engages driven wheel, makes driven wheel rotate, and further drive inclined tooth bar to make inclined motion along the track of sliding slot one, since inclined tooth bar is fixedly connected with cutter bar, and inclined lever is guided by the sliding cooperation of sliding slot two and convex shaft two, cutter bar drives cutting knife to realize up-down cutting action, complete a cutting process, so circulate, realize the continuous accurate cutting of moxa stick.

This utility model relates to a cutting blade, belonging to the technical field of ultrasonic probe manufacturing equipment. The cutting blade is disc-shaped and used for rotary cutting of an ultrasonic probe to form piezoelectric array elements. The cutting blade includes a blade body and multiple gradient layers disposed on the outer side of the blade body. The multiple gradient layers are connected sequentially along the radial direction of the blade body, and the thickness of each gradient layer gradually decreases radially outward. Adjacent gradient layers are connected in a stepped manner, and the outer edge of each gradient layer away from the rotation center axis of the cutting blade forms a cutting edge, so that the cutting blade has multiple annular cutting edges arranged at radial intervals. The array elements of the probe cut by this cutting blade are pyramid-shaped, with narrow ends and wide bottoms, which ensures that the formed ultrasonic probe piezoelectric array elements are uniform in size, neatly arranged, and have better stability; effectively improving the resolution and stability of probe imaging.

This utility model relates to the field of atomization spray technology, specifically an atomization spray precision control device. The device includes an atomizer with a side-hollow structure. A baffle plate is located inside the atomizer, and a transmission groove is formed within the atomizer. A connecting rod is fixedly connected to the top of the baffle plate. The top of the connecting rod extends into the transmission groove and is fixedly connected to a gear. A threaded rod is rotatably connected inside the transmission groove. A sliding block is threadedly connected to the external thread of the threaded rod, and another sliding block is threadedly connected to its external thread. A rack is fixedly connected to the bottom of the sliding block. A limit rail is fixedly connected to the top of the inner wall of the transmission groove. The advantages of this utility model are that it ensures uniform drug particle size, enabling precise deposition in the respiratory tract and lungs, improving drug absorption efficiency, optimizing drug distribution, avoiding excessively high or low local drug concentrations, enhancing therapeutic effects, and reducing side effects. Compared to traditional devices, it significantly improves operational quality and efficiency.

The invention provides a method for synthesizing 6-aminocapronitrile from caprolactam. The method comprises the following steps: a gasification device is sequentially provided with a uniform distribution part, an efficient dispersion part, a high-temperature gasification part and an in-situ separation part from top to bottom; liquid-phase caprolactam is injected from the top end of the gasification device, and ammonia gas is injected through the efficient dispersion part; in the efficient dispersion part, liquid-phase caprolactam is broken in a first circular tube nest under the shearing action of gravity and ammonia gas to form liquid drops, and after high-temperature gasification, a gas phase is output from the side part of the gasification device, then enters the reactor filled with the monolithic catalyst from the bottom of the reactor, reacts through the monolithic catalyst and is output from the top of the reactor. According to the invention, caprolactam can be efficiently gasified, coking is not easy to generate, the retention time of a gas-phase reactant in the reactor can be accurately controlled, the reaction efficiency is greatly improved, the discharge amount of wastes in the production process of hexamethylenediamine is reduced, the cost is reduced, the economic benefit is improved, and a guarantee is provided for green, environment-friendly and safe production.

The utility model discloses a manual bread cutting machine, which relates to the technical field of manual bread making equipment and comprises a mounting base and a mounting handle rotatably connected in the mounting base, and the mounting handle is rotatably connected with two mutually symmetrical transmission plates; according to the bread cutting device, the multiple cutting knife frames are distributed in the length direction of the mounting frame in a linear array mode, bread can be cut into multiple parts through one-time operation, and compared with a traditional mode that the bread is broken through fingers or a common bread cutting tool is used, the cutting efficiency is improved, the batch cutting requirement is met, and manpower and time cost is reduced. And on the other hand, the cutting knife frames distributed in an array mode guarantee the consistency of the cutting effect, the cut bread is uniform in shape and size, and follow-up dish making and presenting are facilitated. The design solves the problem that a common bread cutting tool is difficult to ensure the consistency and stability of the cutting effect, and avoids the influence on the dish quality due to different shapes and sizes of bread.

The utility model provides a jacquard's opening drive mechanism relates to textile machinery technical field. The utility model discloses a jacquard's opening drive mechanism, including left side plate, and one side top end of left side plate is fixedly connected with four connecting beams, and the other end of connecting beam is fixedly connected with right side plate, and both sides of left side plate and right side plate are rotatably connected with two eccentric wheels, and the eccentric wheel of both sides has the phase difference of degree. The utility model discloses a jacquard's opening drive mechanism, and left side plate and right side plate constitute stable frame through four connecting beams and provide support for integral mechanism, and the eccentric wheel rotatably connected with both sides can realize alternate motion because of 180 degrees phase difference, and drive mechanism provides power for eccentric wheel, makes it rotate, and the hook mechanism then converts the rotary motion of eccentric wheel into the lifting action of hook, and through the reverse motion of both sides eccentric wheel, drives the hook to alternate lifting, thereby controls the warp to form opening, provides the foundation for the formation of jacquard fabric.

The invention belongs to the technical field of advanced powder material preparation, and particularly relates to a micron-sized metal powder preparation system which comprises a raw material system, a gas supply system and an atomization tower. The atomizing tower comprises an atomizing chamber, a liquid drop collector is arranged at the bottom end of the atomizing chamber, and a reaction kettle is arranged below the liquid drop collector; a micro-mixer and an atomizing device are arranged in the atomizing chamber, the micro-mixer comprises a sol generating unit and a liquid drop generating unit, an inlet of the sol generating unit is connected with a raw material system, an outlet of the sol generating unit is connected with an inlet of the liquid drop generating unit, and an outlet of the liquid drop generating unit is connected with an outlet of the atomizing device. An outlet of the liquid drop generation unit is connected with an inlet of the atomization device, the liquid drop generation unit is further provided with a first gas inlet, and the first gas inlet is connected with a gas supply system. The preparation system provided by the invention realizes accurate control of powder components, morphology and size, and has the advantages of low cost, uniform size, continuous production and the like.

The utility model relates to the technical field of PP plastic recovery, and discloses a recovery device for a PP plastic granulator, which comprises a device shell, a hot melting barrel and a crushing mechanism, the bottom of the device shell is fixedly connected with a supporting plate for supporting, the outside of the device shell is rotatably connected with a plate door, the inside of the device shell is fixedly connected with the hot melting barrel, and the hot melting barrel is fixedly connected with the crushing mechanism. A first motor is fixedly connected to the bottom of the hot melting barrel, a rotating rod is fixedly connected to the output end of the first motor, a fixing disc is fixedly connected to the exterior of the rotating rod, and a connecting plate is fixedly connected to the exterior of the sliding sleeve. Materials are screened through the three layers of screening plates, the materials are allowed to pass only when the materials are melted to be small enough in size and can smoothly pass through tiny holes of the screening plates, so that the materials are discharged after reaching the ideal melting degree, the materials are further dispersed through movement of a connecting plate and a sliding plate in the screening process, and the screening efficiency is improved. And the situation that different crushed aggregates are bonded together and agglomerated, and overall melting is affected is avoided.

This invention discloses a method for preparing zeolite molecular sieves with precisely adjustable particle size, comprising the following steps: (1) adding aluminum source and other raw materials to deionized water and stirring evenly at room temperature; (2) adding silicon source, stirring at room temperature, and then adding template agent to obtain precursor slurry; (3) adding zeolite molecular sieve, the amount of zeolite molecular sieve being 1-15 mg / g of precursor slurry, transferring the precursor slurry to a high-pressure reactor, fixing it on a homogeneous reactor, heating to 0-150℃, maintaining for 1-200 h, and then heating to 160-230℃ for 3 hours to crystallize for 6-96 h; (4) obtaining zeolite molecular sieve after centrifugal washing, drying, and calcination. The innovation of the preparation method of this invention lies in the first use of a two-stage synthesis method, which can gradually reduce the particle size of the zeolite molecular sieve product while increasing the yield of zeolite molecular sieves. This method successfully synthesized SAPO-34 zeolite molecular sieve with a particle size deviation of less than 0.4 μm and ZSM-5 zeolite molecular sieve with a particle size deviation of less than 0.2 μm.

The invention discloses a superfine medium-entropy nanoparticle catalyst for electrochemical oxidation of ethylene glycol and other micromolecules as well as a preparation method and application of the superfine medium-entropy nanoparticle catalyst. The catalyst comprises a superfine medium-entropy nano-particle metal material and a conductive substrate material, the superfine medium-entropy nano-particle metal material comprises copper metal and at least two precious metals, and the catalyst has outstanding catalytic ability. The preparation method of the catalyst is simple and convenient, and only the superfine medium-entropy nanoparticle metal material needs to be synthesized through a solvothermal method and is loaded on the conductive substrate material; the temperature of the whole synthesis process is lower than 200 DEG C, so that the problems of high cost, high energy consumption, poor stability, large potential safety hazard and the like in the traditional synthesis method are solved. The superfine medium-entropy nanoparticle catalyst prepared by the invention shows excellent performance in oxidation of micromolecules such as electro-catalysis ethylene glycol and the like. By taking ethylene glycol electrooxidation as an example, the Pb-CuPtPd MEANs-C can efficiently and stably convert ethylene glycol into glycollic acid, the mass activity of the Pb-CuPtPd MEANs-C under 0.9 V vs.RHE reaches up to 14 A mg <-1 > PtPd, and the Faraday efficiency (FEGA) of glycollic acid production is 82.3%.

The invention belongs to the technical field of metal material processing, and discloses a cold rolling method for overcoming brittle fracture of non-oriented silicon steel for a new energy automobile, which comprises the following steps: S1, normalizing treatment: heating at 920-1000 DEG C for 2.5-4 minutes; s2, pickling treatment: pickling in an acidic aqueous solution, then soaking in a clean water tank, neutralizing with an alkaline aqueous solution, blow-drying and coating oil to prevent rusting; s3, heating treatment is conducted, specifically, the workpiece is placed in a box-type resistance furnace, and heat preservation is conducted for 20-120 min under the condition of 200-500 DEG C; s4, cold rolling is conducted, specifically, hot rolling is rapidly conducted on a cold-rolling mill; and S5, continuous annealing is conducted, specifically, continuous annealing is conducted at the strip steel speed of 85 m / min to 95 m / min, and the annealing soaking temperature is 920 DEG C to 1000 DEG C. The technical problem that when silicon steel cold rolling is carried out in a laboratory environment, the edge of a cold-rolled plate is cracked or brittle fracture occurs is solved.

This invention belongs to the field of fire extinguishing materials and their preparation technology, and provides a fire extinguishing microcapsule and its microfluidic controllable preparation method. The preparation method is characterized by the following steps: (1) preparing fluids of each phase, (2) preparing a dual emulsion using a microfluidic device, (3) collecting and sealing the dual emulsion in a collection container, controlling the axis of the collection container to be horizontal, and controlling the collection container to rotate around its axis for 1 to 15 minutes, applying light to solidify the outer shell of the dual emulsion droplets while maintaining the rotation of the collection container, cleaning, and drying to obtain the final product. The fire extinguishing microcapsule prepared by this method consists of an outer shell and a liquid fluorine-containing fire extinguishing agent encapsulated within the outer shell. The outer shell of the fire extinguishing microcapsule has a uniform thickness, and the eccentricity between the outer shell and the core is less than 0.1. The method of this invention can achieve precise customization of fire extinguishing microcapsules according to the differentiated fire characteristics of different application scenarios, and can improve the concentricity between the core and the outer shell of existing fire extinguishing microcapsules.

The application belongs to the technical field of polymer preparation, and particularly relates to a high-strength self-supporting polypyrrole nano array and a preparation method and application thereof. The preparation method comprises the following steps: (1) first, dispersing a hydroxypropyl-beta-cyclodextrin and polyethylene glycol aqueous solution onto an ice surface, and then adding a pyrrole monomer to form a dispersion liquid; (2) adding an acid solution containing an oxidizing agent to the dispersion liquid, and obtaining the high-strength self-supporting polypyrrole nano array after reaction. The application directly uses a macroscopic ice block as a hard template for polypyrrole preparation, and introduces a cyclic molecule hydroxypropyl-beta-cyclodextrin with hydrophilic and hydrophobic dual functions and polyethylene glycol with a linear polymer chain as an array growth aid, so that a high-strength polypyrrole nano sheet array with a self-supporting structure is prepared through a one-step polymerization method. The high-strength polypyrrole nano sheet array can be used as a conductive filler of polyurethane in the field of 3D printing technology, and greatly improves the mechanical properties and antistatic ability of products.

The application discloses a sweet potato soilless tuberization cultivation system and method. In view of the fact that existing sweet potato production cannot get rid of solid substrates such as soil, and is restricted by upgrading of cultivation technology and product value positioning, the sweet potato soilless tuberization cultivation technology of the application adjusts the number and single weight of tubers by controlling environmental air pressure conditions. The cultivation system comprises a culture box and a regulation system, the culture box is divided into a nutrient bin and a tuberization bin, the tuberization bin is provided with seedling holes and has an airtight structure, and the regulation system monitors and regulates the culture conditions in the culture box. The culture method is a stage regulation culture technology, and the continuous long-term tuberization production can be realized through the tuberization period regulation culture. The application solves the key technical problem that all existing soilless cultivation technologies of sweet potato need to use solid substrates to press vines to induce tuber enlargement to realize tuberization, is a completely soilless cultivation technology of sweet potato, introduces the sweet potato cultivation technology into a new stage, and provides a scientific basis and production control means for stable small-scale sweet potato production.

The application relates to a highly-ordered porous sulfur / oxygen co-doped carbon sphere and a preparation method and a potassium ion battery thereof, and belongs to the technical field of battery materials. The application discloses a preparation method of a highly-ordered porous sulfur / oxygen co-doped carbon sphere. The carbon sphere is prepared by mixing sulfur powder and resin material, the prepared carbon sphere is uniformly doped with atoms, the pore size distribution is uniform, the number of potassium storage sites is relatively large, and the carbon sphere can be applied to a potassium ion battery. The application further discloses a potassium ion battery. The active material of the potassium ion battery comprises the highly-ordered porous sulfur / oxygen co-doped carbon sphere. The potassium ion battery can be a half battery assembled by a negative electrode material containing the highly-ordered porous sulfur / oxygen co-doped carbon sphere and metal potassium. The potassium ion battery can also be a full battery assembled by the negative electrode material containing the highly-ordered porous sulfur / oxygen co-doped carbon sphere and a prussian blue positive electrode material.

The invention discloses a construction method of a colorectal tumor model based on 3D printing, which comprises the following steps: dissolving methacrylated gelatin and phenyl (2, 4, 6-trimethylbenzoyl) lithium phosphate together to obtain a mixed solution, adding colorectal cancer cells HCT-116 and human skin fibroblasts BJ into the mixed solution, and uniformly mixing to obtain bio-ink; and loading the bio-ink into a charging barrel of an extrusion type biological 3D printer for 3D printing to obtain the tumor cell-carrying gel microspheres, and culturing in vitro to obtain the tumor cell-carrying gel microspheres. According to the method, the upper limit of cell density of liquid drop biological 3D printing is broken through, stable printing of biological ink with the cell density as high as 1 * 10 < 8 > cells / mL is successfully achieved through optimization of a rheological window, the density is close to the physiological level of solid tumors, the printed tumor model can truly simulate the high compactness of the tumors and the nutrition / oxygen gradient effect caused by the high compactness of the tumors, and the tumor model has good application prospects. And an experimental platform closer to the in vivo is provided for researching the microenvironment heterogeneity in the tumor.

The present application relates to a kind of ceramic materials for 5G medium filter and preparation method thereof.The chemical composition of the ceramic material for 5G medium filter is x CBZS glass-(1-x) Mg 0.95 Ca 0.05 Ti 0.95 (Zn 1 / 3 Nb 2 / 3 ) 0.05 O3, wherein wt%≤x≤wt%;The composition of the CBZS glass includes: 40-60 mol% CaO, 10-25 mol% B2O3, 25-45 mol% ZnO, 10-20 mol% SiO2.

The utility model relates to the technical field of plastic packaging all-in-one machines, and discloses a door pocket slotting plastic packaging all-in-one machine which comprises a working table, a conveying assembly is fixedly installed at the upper end of the working table, a plastic packaging machine is arranged on one side of the conveying assembly, and door pockets are conveyed in the conveying assembly and the plastic packaging machine. Hydraulic rods of two sets of control tables in the conveying assembly are used for driving piston plates to drive first conveying rollers to be adjusted up and down, the first conveying rollers are matched with second conveying rollers of a conveying table to form an up-down clamping conveying structure, and meanwhile an electric push rod of the guide assembly pushes fourth obliquely-arranged conveying rollers to laterally press and limit the door pocket. The door pockets with different thicknesses and widths are stably restrained in all directions in the conveying process; when the door pocket is precisely conveyed to a grooving area, the grooving motor on one side of the control table is started under linkage control of the PLC, the cutter synchronously and efficiently conducts grooving along with the conveying speed, and the problem of force unbalance caused by manual pushing is avoided.

This invention discloses a combined steel formwork system for anchor beams on soft rock high slopes and its usage method. The system includes adjustable supports (5); combined steel formwork for main beam segments, which includes a left formwork, a right formwork, and a top formwork. The left formwork includes a left formwork main panel (1) and a left formwork flange plate (2) located on one side of the top of the left formwork main panel (1). The top formwork includes a top formwork main panel (12) and a top formwork right-side protruding water-retaining flange plate (11) located on the top of one side of the top formwork main panel (12); a formwork fastening device (13) located between the left, right, and top formswork; and an integral steel formwork for the cross-shaped nodes of the frame beams at the joint points of multiple combined steel formwork units for anchor beams on soft rock high slopes. The system of this invention controls the elevation and straightness of the side forms by adjusting the adjustable supports, thereby unifying the dimensions of the frame beams and solving the problem of the difficulty in manually leveling the bottom of rock trenches.

A single-crystal-type multi-element positive electrode material, and a preparation method therefor and an application thereof. The positive electrode material satisfies the following conditions: single crystal sizes DPS90, DPS10 and DPS50 of the positive electrode material, which are measured by means of SEM, satisfying the following relationship: 0.1≤B90=(DPS90-DPS10) / DPS50≤1.5; and the agglomeration rate of the positive electrode material being less than or equal to 20%, wherein DPS90 represents that 90% of the single crystal size of the positive electrode material is less than DPS90, DPS50 represents that 50% of the single crystal size of the positive electrode material is less than DPS50, and DPS10 represents that 10% of the single crystal size of the positive electrode material is less than DPS10. The single-crystal-type multi-element positive electrode material has rounded morphology, a uniform particle size, less agglomeration, less adhesion, a high compaction density and a good structural stability, and when same is applied to a lithium ion battery, the energy density, rate capability, cyclic stability and safety of the lithium ion battery can be improved.

The utility model discloses a multi-cavity feed grinder, and relates to the technical field of feed processing. The device comprises a crushing box, a screening assembly and a winnowing machine, a winnowing machine is arranged at the top end of the smashing box, a screening assembly is arranged in the smashing box, two baffles inclining towards the upper end of the screening assembly are further arranged in the smashing box, a rotating shaft is rotationally connected into the smashing box, a rotating cylinder is fixedly connected to the peripheral side of the rotating shaft, and smashing blades are fixedly connected to the peripheral side of the rotating cylinder. Crushing teeth are arranged on the lower inclined surfaces of the baffles close to the crushing blades; according to the feed grinder, the grinding box, the screening assembly and the winnowing machine are arranged, so that the problem that the whole feed grinder cannot work due to the fact that a single assembly of an existing traditional feed grinder goes wrong is solved, and the problem that the sizes of ground feed particles are different is solved; and the problem that crushed leaves are damaged due to the fact that stones are possibly mixed in the added feed is solved.

This utility model relates to the field of ice maker technology, specifically an ice maker utilizing semiconductor refrigeration. An ice maker utilizing semiconductor refrigeration includes an upper cover assembly, a water tray, an inner cover, a cold plate, a radiator, an insulated outer shell, a base, and a bottom cover. Its features include: the bottom of the insulated outer shell is connected to the base; a cold plate is located inside the insulated outer shell; a water tray is located inside the cold plate; the top of the cold plate is connected to the inner cover; and the upper cover assembly is connected above the inner cover. A radiator is located below the cold plate, and a cooling fan is located on one side of the radiator. The base contains a drive circuit board and a DC power supply, which is connected to a power cord. Compared with existing technologies, this ice maker utilizing semiconductor refrigeration optimizes the semiconductor refrigeration module design, improves the heat exchange system, and combines an advanced temperature control scheme to achieve fast ice-making speed, high ice-making quality, ease of use, and low energy consumption.

The invention relates to a furosemide tablet and a preparation method thereof.The furosemide tablet is prepared from, by weight, 25.00% of furosemide, 40%-45% of filler, 27%-33% of adhesive, 0.5%-1.5% of lubricant, 1.0%-2.0% of anti-sticking agent and 0.5%-1.5% of flow agent.The furosemide tablet is prepared by adopting the technology that purified water is directly added without preparing the adhesive; a wet granulation process is adopted, the controllability of process parameters in the production process is high, the human influence of operation of multiple process steps is reduced, the quality stability of the medicine is effectively improved, the quality of the medicine is equivalent to that of a commercially available reference preparation, and multiple dissolution curves are similar to that of the reference preparation; the in-vitro dissolution behavior similar to that of a reference preparation is shown, the quality is stable, and the dissolution behaviors among batches are consistent.

The invention discloses a zirconia ceramic matrix with high thermal shock resistance as well as a preparation method and application thereof. The zirconia ceramic matrix comprises a matrix and a coating layer a; the matrix comprises the following components: 90-98 wt% of zirconium oxide; 1.5 to 8 wt.% of a stabilizing agent; % of a grain boundary regulating agent; the stabilizing agent is prepared from the following components in percentage by weight: 2.0 to 4.0 percent of Sc2O3, 0.5 to 1.5 percent of Yb2O3 and 0.3 to 1.0 percent of Er2O3; the grain boundary regulating agent is a composition of a boron source and an aluminum source; in the coating layer a, the molar ratio of zirconium to aluminum is (2-3): 1; and the component 1 is polyvinyl alcohol or polyvinylpyrrolidone. The fracture toughness, bending strength and thermal shock resistance of the ceramic matrix are effectively improved, and the overall mechanical property is remarkably improved. When the material bears thermal shock, the thermal shock resistance of the material is improved, and the application scene of the zirconia ceramic material is expanded.

The application belongs to the technical field of biological probes, and relates to a PD-L1 guided specific targeted CTC detection combined with tumor boundary distinguishing biological probe and a preparation method thereof. The PD-L1 guided specific targeted CTC detection combined with tumor boundary distinguishing biological probe comprises a core, a covalent organic framework and a PD-L1 antibody, the core comprises a superparamagnetic nanoparticle, the covalent organic framework is coated on the surface of the core, and the PD-L1 antibody is combined on the surface of the covalent organic framework. The PD-L1 guided specific targeted CTC detection combined with tumor boundary distinguishing biological probe prepared by the application can be transported into the body across the membrane, smoothly enter a PD-L1 positive malignant tumor lesion, and perform Raman imaging to microscopically distinguish the tumor boundary.

The present application relates to tap processing technical field, specifically to tap chip machine, the inside of machine tool equipment is provided with drive assembly, the front end of drive assembly is provided with polishing clamping disc, the front end of polishing clamping disc is uniformly fixed and installed with multiple clamping shells, the both ends of each clamping shell are slidably installed with moving clamping rod, one end of each moving clamping rod is fixedly installed with clamping block in clamping shell, the other end of each moving clamping rod is rotatably installed with push rod, every two corresponding push rods are rotatably connected, a plurality of limiting holes are uniformly formed on each polishing clamping disc, the hinged end of every two corresponding push rods is installed with sliding rod in limiting hole, and a limiting shell is fixedly sleeved on each sliding rod and located at the rear side of polishing clamping disc. By polishing the edge of tap, the edge burrs of batch taps can be polished and removed, effectively avoiding defects such as scratches and indentation on the surface of workpiece thread during tapping, thereby prolonging the overall service life of tap.

The application discloses a Ru / CeO2-SiO2 catalyst for hydrogen production by ammonia decomposition and a preparation method thereof, and belongs to the technical field of catalyst preparation. The catalyst comprises an active component Ru and a carrier CeO2 / SiO2. The CeO2 nanoparticles are uniformly dispersed on the surface of SiO2 by using an electrostatic adsorption method, and the active component Ru nanoparticles are selectively loaded on the surface of CeO2. The CeO2 has a unique Ce 3+ -Ce 4+ The variable valence capacity can form rich oxygen vacancies. The generation of the oxygen vacancies is favorable to enhancing the interaction intensity between Ru and CeO2, improving the electronic structure of the Ru surface, activating reactants, optimizing reaction kinetics, and promoting the ammonia decomposition reaction. In addition, the Ru particles are only distributed on the surface of CeO2, and even if the CeO2 moves on the surface of SiO2 at high temperature, the active component Ru will not be agglomerated, so that the Ru / CeO2-SiO2 catalyst exhibits excellent ammonia decomposition reaction catalytic performance and good stability.

The invention belongs to the technical field of polymer preparation, and particularly relates to a self-supporting polypyrrole nano array as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) dispersing an aqueous solution of hydroxypropyl-beta-cyclodextrin on an ice surface, then adding a pyrrole monomer, and standing to form a dispersion liquid; and (2) dropwise adding an acid solution containing an oxidizing agent into the dispersion liquid, reacting, washing and drying to obtain the self-supporting polypyrrole nano array. Compared with zero-dimensional polypyrrole nano-particles or polypyrrole nano-sheets, the array structure is a pre-constructed continuous conductive path. Moreover, the network structure of the polypyrrole nanosheet array with the self-supporting structure can interpenetrate with a resin matrix, uniformly transfer stress, inhibit crack propagation and easily form a continuous conductive path, high conductivity can be realized by a low addition amount, and the polypyrrole nanosheet array can be used as a conductive filler of polyurethane in the technical field of 3D printing; the mechanical property and the antistatic capability of the product are improved.

This application discloses an extrusion-type ice maker for balancing liquid levels, comprising: a main water tank; a water pump; and an evaporator. A first pipeline connects the evaporator and the main water tank, allowing the main water tank to inject water into the evaporator via the first pipeline. The water pump is located on the first pipeline and drives the water flow within it. A second pipeline connects the auxiliary water tank and the evaporator, allowing the auxiliary water tank to balance the liquid level within the evaporator via the second pipeline. A third pipeline connects the auxiliary water tank and the main water tank, allowing the auxiliary water tank to return water to the main water tank via the third pipeline. The main water tank directly injects water into the evaporator via the first pipeline to balance the water volume within the evaporator, ensuring sufficient water in the evaporator and improving ice-making efficiency. The auxiliary water tank returns water to the main water tank via the third pipeline, preventing water waste.