242results about How to "Smooth response" patented technology

The invention provides a continuous preparation system and method of pyroxasulfone. The continuous preparation system comprises a mixing device, a continuous oxidation reaction device, a continuous quenching device, a continuous devitrification device, a continuous solid-liquid separation device and a continuous drying device. Compared with intermittent preparation of pyroxasulfone, the continuous preparation system disclosed by the invention has the advantages that the reaction can be more stable, and the reaction temperature can be more accurately controlled, so that the problems of large heat release and high process risk in batch reaction can be effectively solved. Moreover, compared with a tank reactor, the continuous oxidation reaction device filled with the catalyst bed layer can improve the oxidation reaction rate, shorten the oxidation reaction time and improve the yield and selectivity of oxidation products.

The invention provides a robot customer service question intelligent processing method and system. The method comprises the steps that user questions are acquired, and feature extraction and integration are conducted on the user questions; constructing a user dynamic causal reasoning model, and generating a multi-level problem solving strategy according to user problems; constructing a self-adaptive response strategy generation model according to the generated multi-level problem solving strategy and the integrated feature vector to generate a response strategy most adaptive to the current corresponding context; executing the response strategy and judging whether to perform learning triggering according to the feedback of the user; performing real-time adaptive learning and optimization on the adaptive response strategy generation model through user feedback and historical user feedback; and analyzing the long-term trend of the historical user feedback and the model parameters of the adaptive response strategy generation model after multiple times of optimization, performing global optimization in combination with the long-term trend, and generating a final response strategy. The method and the device can be excellently expressed in a complex user service scene.

The invention discloses an ammonia nitrogen detection system and an application method thereof, and ammonia nitrogen detection test paper, the ammonia nitrogen detection system is prepared by the following steps: step SA1) preparing a dipping mixed solution, the dipping mixed solution comprises: a potassium sodium tartrate solution with a concentration of 3-60 g / L; a sodium salicylate solution with a concentration of 20-320 g / L; the concentration of the sodium nitroprusside solution is 0.1 to 0.8 g / L; and deionized water. On the basis of the principle of salicylic acid-pypocholoride spectrophotometry, the impregnated test paper, the reagent tube and the standard colorimetric card are combined, and the rapid ammonia nitrogen detection system special for medium-concentration sewage detection is successfully developed. The toxicity problem of mercury iodide in a Nessler reagent method and the toxicity problem of phenol in a phenol-pypocholoride spectrophotometric method are avoided, main reagents are non-toxic and harmless to a human body, interference of metal ions in a water sample can be effectively eliminated by adopting sodium potassium tartrate tetrahydrate as a chelating agent, and the detection stability and accuracy are improved.

The invention relates to the technical field of water treatment, in particular to an efficient scale and corrosion inhibitor and a preparation process thereof. The method comprises the following steps: 1, preparing materials; step 2, operating a first reaction kettle; step 3, operation of a second reaction kettle; step 4, performing subsequent operation; according to the efficient scale and corrosion inhibitor and the preparation method thereof, the adding quality and operation parameters of all the raw materials are controlled, the stability of the product quality is improved, PBTC can effectively disperse insoluble inorganic salt, industrial equipment is protected, and the water treatment efficiency is improved; pESA is green, environment-friendly and biodegradable, and has good scale dispersion and corrosion inhibition effects; the sodium formate solution promotes system stability and smooth reaction, the deionized water is added twice, the reaction process is effectively controlled, the product uniformity is improved, an efficient and reliable solution is provided for water treatment through the synergistic effect of all the components, meanwhile, multiple discharging modes are flexibly selected, and the production cost is reduced. And the convenience and the practicability of production are further improved.

The invention relates to the field of DNA amplification, in particular to an intelligent molecular diagnosis and analysis method, device and equipment and a storage medium. The method comprises the following steps: detecting multi-dimensional environmental parameters of the DNA amplification kit in real time based on a multi-dimensional sensing node; performing spatial topology layout mining and environment amplification perception fitting on the multi-dimensional environment parameters, and constructing a real-time amplification perception model; identifying a DNA amplification sample; performing layered temperature control analysis on the DNA amplification sample, and performing dynamic amplification constant-temperature control on the real-time amplification perception model, so as to construct a plurality of dynamic constant-temperature amplification models; carrying out regional DNA reaction degree evaluation on the plurality of dynamic isothermal amplification models one by one, and then carrying out regional flow velocity dynamic regulation, so as to construct a dynamic amplification reaction flow velocity regulation strategy; real-time amplification control is performed based on a dynamic amplification reaction flow rate adjustment strategy to generate a filter optimized amplification reaction signal. According to the method, the accuracy of molecular diagnosis analysis is improved through efficient and convenient DNA isothermal amplification.

The invention provides a system and a process method for co-production of hexafluoropropylene oxide and trifluoroacetic acid, and relates to the technical field of fluorine chemical industry. The system comprises a raw material storage device, a liquid phase oxidation reaction device, a rectifying tower, a hydrofluoric acid absorption tank, a trifluoroacetic acid absorption tank, a process water tank, a hydrofluoric acid concentration detector and a trifluoroacetic acid concentration detector. According to the method, the hydrofluoric acid and the trifluoroacetic acid are co-produced while the hexafluoropropylene oxide is produced, so that complex production processes such as use of non-renewable resources, high raw material price, use of a catalyst for catalysis, addition of an auxiliary agent and the like in the traditional hydrofluoric acid and trifluoroacetic acid production process are avoided; the technology for continuously producing hydrofluoric acid and trifluoroacetic acid, which is simple and efficient in technological process, low in raw material price and free of catalyst catalysis, is developed, and the technology is relatively high in technicality, low in safety risk and suitable for industrial application.

The invention relates to the field of phenolic resin adhesives, and particularly discloses a preparation method of a phenolic resin adhesive for a bamboo oriented strand board, which comprises the following steps: (1) phenol activation: adding phenol and a basic catalyst aqueous solution into a reaction kettle, and activating to form an intermediate state of phenate negative ions; (2) addition stage: adding a high-concentration formaldehyde reactant into the reaction kettle, and carrying out heat preservation reaction to generate hydroxymethyl phenol; (3) heating and replenishing: heating to 80 + / -2 DEG C, keeping the temperature, replenishing the formaldehyde aqueous solution into the reaction kettle, and keeping the temperature for 20-25 minutes; (4) polycondensation stage: adding a basic catalyst aqueous solution, heating to 90 + / -2 DEG C, and carrying out heat preservation reaction; and (5) terminating the reaction: after the heat preservation reaction, detecting the viscosity, cooling, and discharging to obtain the adhesive. The phenolic resin with the solid content of 60% or above can be prepared, the adhesive has excellent bonding performance, and the prepared shaving board is excellent in mechanical strength.

The invention belongs to the technical field of synthesis of ether organic compounds, and particularly relates to a one-pot catalyst-free method for preparing ethylene glycol dimethyl ether from ethylene glycol, which comprises the following steps: (1) adding ethylene glycol into a reaction kettle, heating to 120-140 DEG C, introducing methane chloride, and controlling the introduction amount of methane chloride to be 20-50% of the total molar amount of ethylene glycol; (2) adding NaOH into the reaction kettle in batches, and stirring for reaction at the reaction temperature of 120-140 DEG C; (3) after the last batch of NaOH is added, sampling and detecting every 20-25 minutes, and measuring the concentration lt of NaOH in the reaction liquid; and when the concentration is 0.05 mol / L, finishing the reaction, filtering, and carrying out post-treatment rectification on the filtrate to obtain the ethylene glycol dimethyl ether. The preparation raw material ethylene glycol can be derived from biomass or coal, dependence on petroleum resources is reduced, and meanwhile the preparation method has the advantages of being few in side reaction and low in production cost.

The invention provides a preparation method of high-purity molybdenum trioxide, which belongs to the technical field of molybdenum trioxide production and comprises the following steps: S1, crushing, grinding and roasting molybdenum ore sand to obtain crude molybdenum oxide, adding the crude molybdenum oxide into a sodium hydroxide solution, heating, stirring and filtering to obtain a crude sodium molybdate solution; s2, adjusting the pH value of the crude sodium molybdate solution to 5.5-7.0, introducing the crude sodium molybdate solution into an exchange column of macroporous cation exchange resin, then adjusting the pH value of the solution to 7.0-8.5, and introducing the crude sodium molybdate solution into an exchange column filled with anion exchange resin to obtain a high-purity sodium molybdate solution; s3, excessive ammonia water is added into the high-purity sodium molybdate solution, ammonium molybdate is separated out, washing and drying are conducted, and high-purity ammonium molybdate is obtained; and S4, the high-purity ammonium molybdate is put into a rotary calcining furnace, rare earth oxide is sprayed on the inner wall of a furnace tube, and the high-purity molybdenum trioxide is prepared by adopting a calcining mode of firstly heating, then cooling and then heating. According to the invention, the purpose of producing high-purity molybdenum trioxide is realized.

The utility model discloses a preparation device for high-viscosity hydroxypropyl starch ether, which belongs to the technical field of chemical equipment, aims to solve the problem that the adding speed of raw materials cannot be adjusted according to the reaction rate, and comprises a reaction kettle, supporting legs are fixedly mounted at the bottom of the reaction kettle, and an air adding device is fixedly mounted on the right side of the top of the reaction kettle. A feeding mechanism is arranged on the left side of the top of the reaction kettle, and an adjusting mechanism is mounted on the feeding mechanism; according to the utility model, through the arrangement of the adjusting mechanism, when starch raw materials are added into the reaction kettle, the adding speed of the starch raw materials can be adjusted according to the specific reaction process in the reaction kettle, so that the reaction speed of the starch raw materials in the reaction kettle is improved, the starch raw materials are fully reacted, and the product quality is further improved; in the process of adding the raw materials into the reaction kettle, the adding speed of the raw materials can be adjusted, meanwhile, blockage can be avoided when the raw materials are added, and thus the smooth completion of the reaction is guaranteed.

The invention discloses a sludge low-temperature oxidation treatment system and method. The system comprises a pretreatment unit, a feed lifting mechanism, a low-temperature oxidation furnace, a flue gas purification unit and an automatic control unit. The low-temperature oxidation furnace is divided into a feeding area, a low-temperature oxidation area and an air distribution and slag discharge area from top to bottom, an air distribution plate is provided with air outlets which are uniformly arrayed, the temperature of the low-temperature oxidation area is controlled to be 420-480 DEG C, and generation of dioxin is inhibited from the source. The pretreatment unit is used for mixing sludge, biomass and quartz sand to form a loose breathable material to prevent the sludge from hardening; the method comprises the steps of material mixing, continuous feeding oxidation, temperature closed-loop regulation and control, flue gas purification and ash treatment, high-water-content municipal sludge can be stably treated, the energy consumption is low, the dioxin generation amount is low, flue gas emission reaches the standard, ash can be recycled, and the method is suitable for large-scale municipal sludge harmless treatment.

The invention relates to the technical field of blast furnace slagging systems, and discloses a blast furnace slagging system based on magnesium-aluminum ratio optimization. According to the blast furnace slagging system based on magnesium-aluminum ratio optimization, spectral data and real-time oxygen concentration data of blast furnace slag are collected in real time, the spectral data are analyzed to calculate the magnesium content and the aluminum content in residues, after the magnesium content and the aluminum content in the residues are obtained through calculation, the magnesium-aluminum ratio is calculated according to the two data, the magnesium-aluminum ratio is compared with a magnesium-aluminum ratio threshold value, and the magnesium-aluminum ratio is calculated. When the magnesium-aluminum ratio exceeds the magnesium-aluminum ratio threshold value, the blast furnace data analysis unit calculates an oxygen concentration mean value, compares the oxygen concentration mean value with the oxygen concentration threshold value, judges whether the oxygen concentration is abnormal or not, and judges the reason of insufficient magnesium-aluminum reaction in the blast furnace according to the combination of the abnormal oxygen concentration and the abnormal magnesium-aluminum ratio; oxygen or magnesium-aluminum solids are supplemented to the blast furnace in time, so that accurate online monitoring is provided, the magnesium-aluminum reaction in the blast furnace is more stable, and the stability and the metal recovery rate of the blast furnace are improved.

The invention discloses an anti-corrosion magnesium alloy and a preparation method and a micro-arc oxidation treatment process thereof, relates to the technical field of magnesium alloys, and solves the problem of poor corrosion resistance of magnesium alloys in the prior art. The anti-corrosion magnesium alloy prepared by the method comprises the following chemical components in percentage by mass: 4-8 wt% of aluminum, 2-5 wt% of lanthanum, 1-3 wt% of samarium, 0.5-1.0 wt% of gadolinium, 0.3-0.6 wt% of yttrium, 0.2-0.5 wt% of manganese, magnesium and inevitable impurities, wherein the total mass fraction of the inevitable impurities is less than 0.03%. The anti-corrosion magnesium alloy is prepared by introducing rare earth elements (lanthanum, samarium, gadolinium and yttrium), the micro-arc oxidation ceramic film layer is prepared on the surface of the anti-corrosion magnesium alloy by adopting a low-voltage, low-duty-ratio and low-concentration electrolyte micro-arc oxidation treatment process, the electrochemical corrosion reaction is effectively inhibited, the corrosion resistance of the alloy is improved, the cost is low, and the application range is wide. Good industrial application prospects are realized.

The invention provides a method for synthesizing carboxymethyl cellulose by a slurry method based on a novel etherifying agent and an application, the method comprises the following steps: adding crushed cellulose into a reaction container filled with an organic solvent, stirring, continuously introducing nitrogen into the reaction container, and when the temperature of the reaction container reaches 25-35 DEG C, stirring for 2-3 hours; slowly dropwise adding a sodium hydroxide aqueous solution into the reaction container, keeping the temperature for a period of time, rapidly raising the temperature of the reaction container to 55 DEG C, slowly adding a novel etherifying agent into the reaction container, controlling the temperature of the reaction container to be kept at 55-75 DEG C, placing the reaction container at 65 DEG C after dropwise adding, and keeping the temperature for a period of time; wherein the novel etherifying agent is low-carbon alcohol chloroacetate or chloroacetamide, an acidic material is added into a reaction container to adjust the pH value of a reaction system to 6.5-7.5, washing liquid is used for multiple times to obtain carboxymethyl cellulose, and the novel etherifying agent is adopted to solve the problems of a traditional etherifying agent. And the high-quality and high-substitution-degree carboxymethyl cellulose is prepared.

According to the epoxypropane production system and method with the high conversion rate and the high yield, the interior of the reactor is divided into the upper section and the lower section through the production system, the accurate feeding proportion of three materials is provided, and the mode of segmented control and distributed feeding is provided; propylene and most of hydrogen peroxide diluted by a solvent are added into a first reaction section at the bottom through a first-stage feeding distributor for reaction, and then a reaction mixed solution of the residual solvent and hydrogen peroxide is supplemented into a second reaction section through a second-stage feeding distributor, so that reaction materials are uniformly mixed for reaction; the problem that the temperature is too high and hydrogen peroxide is decomposed due to uneven mixing caused by one-time adding or non-distributed adding of materials is avoided, the conversion rate of the materials is increased, meanwhile, fins are arranged on the outer sides of the catalytic tubes, the heat exchange area is increased, reaction heat is discharged in time, hydrogen peroxide decomposition is avoided, and the catalytic effect is improved. The selectivity and the yield of the product epoxypropane are further improved.

The invention relates to the technical field of sewage treatment, and provides a wastewater treatment device for heavy metal remediation and a treatment method.The wastewater treatment device comprises a treatment pond, a first motor is fixedly mounted at the bottom end of the treatment pond, a threaded shaft is mounted at the upper end of the first motor, and a separation mechanism is connected to the middle of the threaded shaft; and the upper end of the separation mechanism is connected with a stirring mechanism. Waste water is subjected to layering treatment through the separation mechanism, sewage and treated medicine powder are evenly mixed, uneven reaction of the waste water in the treatment process is avoided, the stirring mechanism shovels up the sewage on the separation mechanism along the inclined face of the turning plate, the sewage is divided into several bundles on the flow guide groove to flow out, and meanwhile due to the fact that the stirring mechanism and the medicine throwing mechanism synchronously rotate, the stirring effect is good. The medicine powder in the medicine storage grids is taken out by the roller according to the amount, the situation that the proportion of the medicine is imbalanced due to the fact that the medicine is put too much is prevented, and sewage shunted on the flow guide groove is evenly mixed with the medicine powder rolled out on the roller through impact of water flow in the spraying process.

The invention relates to a chiral pyridinium salt carbonyl catalyst as well as a preparation method and application thereof, the structural general formula of the catalyst is # imgabs0 #, in the formula, R1 is # imgabs1 #, X1-6 comprises N or C-R6-11; r2, R4 and R6-11 comprise hydrogen, alkyl of C1-24, alkyloxy, # imgabs2 # CO2Rd, halogen, nitryl, cyano or trifluoromethyl; r3 comprises substituted or unsubstituted C1-24 alkyl groups, substituent groups comprise halogen, C1-10 alkyl groups, C3-10 cycloalkyl or aryl groups, C1-8 carbonyl groups, C1-8 sulfonyl or phosphoryl groups, and C1-10 alkoxy or amido groups, and carbonyl groups comprise aldehyde groups, ketone carbonyl groups, ester carbonyl groups, carboxyl groups or amido groups; and R5 has the structural formula of # imgabs3 # X <-> which is an anion. Compared with the prior art, the catalyst disclosed by the invention is used for a bionic aldol reaction of amino acid derivatives to synthesize a series of beta-hydroxyl-alpha-amino acid compounds with extremely high enantioselectivity.

The invention belongs to the technical field of organic synthesis, and particularly relates to a preparation method of 5-bromopyridine-2-carboxylic acid methyl ester, which specifically comprises the following steps: 1) reacting 3-butyric acid-2-oxo-methyl ester with 2-bromoethylamine to synthesize 6-amino-5-bromo-3, 5-diene-2-ketone; (2) enabling the 6-amino-5-bromine-3, 5-diene-2-ketone prepared in the step (1) to react with glacial acetic acid, and synthesizing 5-bromine-2-methylpyridine; (3) reacting the 5-bromo-2-methylpyridine prepared in the step (2) with potassium permanganate to synthesize 5-bromopicolinic acid; 4) reacting the 5-bromopicolinic acid prepared in the step 3) with methanol and concentrated hydrochloric acid to synthesize the 5-bromopyridine-2-carboxylic acid methyl ester.The preparation method of the 5-bromopyridine-2-carboxylic acid methyl ester.The preparation method of the 5-bromopyridine-2-carboxylic acid methyl ester.The preparation method of the 5-bromopyridine-2-carboxylic acid methyl esterhas the advantages that the total reaction yield is high, the prepared 5-bromopyridine-2-carboxylic acid methyl esteris high in purity, reaction conditions are mild, cyanide does not need to participate in the reaction, and operation is easy.

The invention provides a method for preparing diisooctyl cyclohexane-1, 4-dicarboxylate through continuous catalytic hydrogenation, which is characterized in that a Venturi reactor is used for reaction, and the diisooctyl cyclohexane-1, 4-dicarboxylate is continuously produced by combining a membrane separation process and a vacuum distillation process. Wherein the Venturi reactor can provide a higher gas-liquid mixing ratio, the contact area of gas, solid and liquid phases is large, the mixing effect is good, the mass transfer efficiency is high, and the reaction rate is high. And the membrane separation process can separate the mixed liquid from the catalyst, so that efficient utilization of the catalyst is realized. The energy consumption can be effectively reduced through the vacuum distillation process, and the equipment investment and the operation cost are reduced. According to the present invention, the hydrogenation reaction can be performed under the mild hydrogenation operation condition, and in the whole loop reaction system, the temperature distribution is uniform, the local overheating phenomenon does not exist, and the side reaction is effectively reduced. The method is simple in process, mild in reaction condition, short in reaction time and high in production efficiency, the reactant conversion rate and the target product selectivity are up to 99% or above, and the method is suitable for industrial production.

The utility model discloses a square electrolytic bath pole frame structure, which relates to the technical field of electrolytic hydrogen production equipment, and comprises a first bath frame and a second bath frame, the first bath frame and the second bath frame are arranged in an overlapped manner, the inner sides of the first bath frame and the second bath frame are provided with an assembling component and an electrolytic part, and the assembling component comprises an expansion part. The expansion pieces are arranged at the joint of the first groove frame and the second groove frame, the expansion pieces comprise expansion pieces, each expansion piece comprises a base, and the two sides of each base are movably connected with auxiliary polar plates. According to the square electrolytic bath pole frame structure, after the auxiliary pole plates are completely deflected, the clamping blocks and the stand columns are clamped, so that the auxiliary pole plates and the stand columns form a conductor connected with an external power supply and react with electrolyte after being electrified, and a new anode is added for the device, so that the contact area with the electrolyte is increased; active sites participating in electrochemical reaction are increased, and the reaction is promoted.

The invention relates to the technical field of nodular cast iron production, in particular to iron casting equipment spheroidizing through magnesium metal blocks and a spheroidizing method.The iron casting equipment comprises a supporting table, a workbench is arranged at the top of the supporting table, a supporting plate is fixedly connected to the top of the workbench, and a dust removal structure is arranged at the bottom of the supporting plate; a storage box, a robot and a master console are arranged on the surface of the workbench, a sealing thrust structure is arranged at the top of the supporting table, a sealing spheroidizing structure and a sealing structure are arranged at the bottom of the supporting plate, a ladle transport vehicle is arranged on the surface of the sealing thrust structure, and a ladle barrel is detachably installed on the surface of the ladle transport vehicle. The first air cylinder is started to lift the pushing plate, and meanwhile, the ladle transport vehicle and the ladle barrel are lifted, so that the ladle barrel is in contact with and covers the pressure detection head and is in contact with the sealing strip for sealing, and the volatilization loss of a metal magnesium block in the reaction process is reduced when the ladle barrel is subjected to subsequent spheroidizing; and the splashing phenomenon generated during the reaction can be prevented.

The invention relates to the technical field of copper-molybdenum separation inhibitors, and discloses a preparation method of a polythiocarboxylic acid amine copper-molybdenum separation inhibitor, which comprises the following steps of: separating and purifying tail liquid generated by preparing thionocarbamate to obtain sodium thioglycolate, and reacting with carbon disulfide by taking potassium hydroxide as a catalyst to obtain the polythiocarboxylic acid amine copper-molybdenum separation inhibitor. The novel polythiocarboxylic acid amine copper-molybdenum separation inhibitor is obtained. The resource utilization of the thionocarbamate tail liquid is realized, the raw materials are cheap and easy to obtain, and the process is green and environment-friendly. The polythiocarboxylic acid amine copper-molybdenum separation inhibitor has the advantages of being good in adaptability, safe, environmentally friendly, good in inhibition effect, simple in process, wide in production raw material source and the like.

The invention belongs to the technical field of organic synthesis, and particularly relates to a preparation method of 2-(4-bromophenyl) norcamphane. According to the invention, the proper catalyst is selected to promote the norbornene to be directly added with the bromobenzene Grignard reagent, so that the use of expensive raw materials is avoided, the reaction difficulty is reduced, and the reaction can be smoothly carried out, thereby effectively improving the reaction yield of the 2-phenyl norcamphane. According to the bromination reaction of the 2-phenyl norcamphane, proper catalysts and reaction conditions are selected, and the selectivity of para-products is improved, so that the product yield of the 2-(4-bromophenyl) norcamphane is improved.

The invention discloses a liquid crystal monomer efficient green synthesis method and product, the synthesis method comprises the following steps: S1. in the preparation of biphenyl monomers by Suzuki coupling reaction, or the preparation of ether monomers by Williamson reaction, firstly, the raw materials used for Suzuki coupling reaction or Williamson reaction are added into water, water is used as reaction medium, and stainless steel autoclave is used as reaction equipment; S2. then, the autoclave is sealed, stirring is started, nitrogen is replaced in the stainless steel autoclave, the temperature is increased, after sufficient reaction, the temperature is decreased and the material is discharged, the solid is obtained by suction filtration, and the solid is returned to the stainless steel autoclave; S3. water is added again, stirring is started, the temperature is increased, water is washed, the temperature is decreased, and the liquid crystal monomer product is obtained. The invention is green and environmentally friendly, safe and energy-saving, low in cost, and conducive to industrial production.

The invention belongs to the field of automobile brake equipment, and particularly relates to a commercial vehicle brake device which comprises a supporting box body, a first brake mechanism, a second brake mechanism, a driving mechanism and a cooling mechanism, a horizontally-arranged rotating shaft penetrates through the supporting box body, a brake disc is fixedly arranged at one end of the rotating shaft, the cooling mechanism is arranged in the supporting box body, and a poke rod penetrates through the top of the supporting box body. The output end of the poke rod is connected with the cooling mechanism and the second braking mechanism, the second braking mechanism is arranged in the supporting box body, the braking end of the second braking mechanism is connected with the rotating shaft, the output end of the driving mechanism is connected with the poke rod and the first braking mechanism, and the braking end of the first braking mechanism is connected with the braking disc. When working, the driving mechanism can drive the first brake mechanism and the second brake mechanism to clamp the brake disc and the rotating shaft so as to achieve the braking purpose, and meanwhile, the driving mechanism also drives the water outlet to discharge water, so that the nozzle sprays water to cool a friction part.

The present application relates to the technical field of plunger pump, in particular to a variable stroke double cavity plunger pump, which comprises a shell and a driving motor, two delivery pipes are arranged in the shell, two groups of crankshaft assemblies are arranged on the output shaft of the driving motor, the shell is connected with the corresponding delivery pipe through the crankshaft assembly, and a first one-way valve and a second one-way valve are symmetrically arranged in the delivery pipe along the axis of the crankshaft assembly; the one-way valve comprises a reset assembly, a sealing assembly and a clamping assembly arranged in sequence from top to bottom, the sealing of the sealing assembly is realized by the elastic extension of the reset assembly and the adhesion of the clamping assembly; the sealing assembly on the first one-way valve is provided with a first negative pressure assembly, the sealing assembly on the second one-way valve is provided with a second negative pressure assembly, and the first negative pressure assembly and the second negative pressure assembly are oppositely arranged; by arranging the negative pressure disc and the connecting pipe, the stress area of the sealing ball under the negative pressure condition is increased, the opening speed is accelerated, and the fluid passing efficiency is improved.

The utility model relates to a lifting structure, the lifting structure is used for driving a lifting module to lift along a lifting frame, the lifting structure comprises a driving shaft and two groups of belt assemblies, the driving shaft is rotatably arranged in a horizontal section of the lifting frame along the length direction of the horizontal section of the lifting frame, and the belt assemblies are arranged on the driving shaft. The two sets of belt assemblies are located in the two vertical sections of the lifting frame correspondingly, each belt assembly comprises a transmission belt, a driving wheel, a driven wheel and a balancing weight, the driving wheels are located on the upper portions of the vertical sections of the lifting frame and fixedly arranged on the driving shaft in a sleeving mode, and the driven wheels are located on the lower portions of the vertical sections of the lifting frame and rotationally arranged on the lifting frame; the transmission belt is annular and wound between the driving wheel and the driven wheel, one side of the transmission belt is connected to the lifting module, and the balancing weight is fixedly arranged on the other side of the transmission belt. The utility model aims to solve or at least relieve the problems that an existing lifting structure is not suitable for a wide lifting module and the reaction speed is low, and provides a lifting structure.

The invention relates to the technical field of water resource circulation, and discloses a mine ecological restoration water resource recycling device which comprises a collecting box, the collecting box is installed on the mountain surface of a mine, and a pretreatment mechanism is installed at the top of the collecting box and used for conducting primary treatment on rainwater; one end of the pretreatment mechanism is communicated with an anti-evaporation mechanism which is used for manufacturing a closed storage space of rainwater, a flow dividing mechanism is arranged in the middle of the collection box and is used for automatically dividing different types of rainwater, and the output end of the flow dividing mechanism is communicated with a reaction assembly which is used for outputting reactants to react with the rainwater. A determinator in the flow dividing mechanism can comprehensively detect multiple key parameters such as the pH value, the heavy metal ion content and the mineral substance components of rainwater, and accurate judgment of the rainwater type is achieved based on accurate detection data and a preset rainwater type standard parameter range.

The present application discloses a molybdenum-based composite material and its preparation and application, characterized in that it includes MoO2, MoP and a Mo substrate; the MoO2 and the MoP grow on the Mo substrate. The composite material, thanks to the three-dimensional structure of the precursor molybdenum-based oxide, has a relatively large specific surface area, which is beneficial to increase the active sites of the catalyst; the composite material directly generates the precursor by in-situ reaction through a chemical vapor deposition method, forming a seamless electrode device structure; the prepared seamless molybdenum-based electrode device can not only fully expose the active sites of the molybdenum-based compound catalyst, but also help accelerate the transfer of charges, thereby improving the activity of the catalyst; the preparation method can determine the degree of phosphating by adjusting different annealing temperatures, thereby improving the catalytic activity of the catalyst itself; and it has the advantages of simple operation, stable reaction and strong controllability.

The invention belongs to the technical field of chemical product preparation, and particularly relates to a method for preparing 5-nitrobenzimidazolone through continuous nitration. According to the method, a sulfonic acid group modified Ni-resin material is used as a catalyst, and a tubular reactor-multi-reaction module microchannel reactor combined system is combined, so that continuous preparation of 5-nitrobenzimidazolone can be efficiently realized, a high-purity product can be obtained by adopting the method, meanwhile, the reaction process is safe and stable, and the method is suitable for industrial production. The method has significant value in industrial production.