118results about How to "Meet the actual use requirements" patented technology

The invention relates to a preparation method of an anti-oxidation coating, which belongs to the field of coating material preparation. In the invention, a composite material is taken as a basal body, and the coating comprises the following main components: a SiC phase, a free Si phase and an M phase, wherein the M phase is an MoSi2, WSi2 and TaSi2 single ceramic phase or a multiple ceramic mixing phase; the thickness of the coating is about 20mu m to 600mu m; the coating adopts a process for preparing the coating by a slurry coating-liquid phase ihrigizing in-suit reaction method; the coating system has wide application range, and contains the whole Si ceramic coatings; and the invention effectively control the thickness and the components of the coating by means of the slurry solid content and slurry coating frequency, thereby meeting the in-service use requirements.

The invention relates to a method for applying a gold hydroxyapatite loaded catalyst to catalytic oxidation reaction of formaldehyde at room temperature, belonging to the technical field of indoor air purification. The method is characterized by comprising the following steps: by taking calcium nitrate and diammonium hydrogen phosphate as precursors, obtaining hydroxyapatite by a liquid deposition method; by taking chloroauric acid as a precursor and the hydroxyapatite as a carrier, preparing the gold hydroxyapatite loaded catalyst by an urea homogeneous precipitation method, wherein the percentage by weight of Au is 0.1%-10%; and carrying out the reaction of removing formaldehyde by catalytic oxidation in a reactor, and passing formaldehyde gas through a gold hydroxyapatite loaded catalyst bed layer, wherein the reaction temperature is ranged from -15 DEG C to 25 DEG C. The method provided by the invention has the beneficial effects that formaldehyde pollutants are oxidized to CO2 and H2O at room temperature without complex operations such as temperature rising and heating. The method satisfies the actual using demands on indoor air purification, and has a wide application prospect in the field of indoor air pollutant purification.

The invention relates to a constant-pressure water supply system which is used for enabling network pipe water pressure for water supply to be kept at a constant value. The constant-pressure water supply system comprises a frequency converter, a water pump and a pressure sensor, the pressure sensor is arranged at the position of an outlet of a network pipe and used for sensing actual pressure of outlet water of the network pipe and feeding an acquired parameter back to the frequency converter; the frequency converter is used for comparing the parameter fed back by the pressure sensor and a set value, the difference value of the parameter and the set value is converted into a frequency through calculation, the frequency should be output by the frequency converter at present, and the output frequency is used for regulating rotation speed of an asynchronous motor in the water pump; the water pump is driven by the asynchronous motor to rotate so as to supply water, and the rotation speed of the asynchronous motor is regulated through the frequency output by the frequency converter. The constant-pressure water supply system has the advantages of being high in reliability, high in anti-interference capacity, flexible in combination, simple to program, convenient to maintain, low in cost and the like. The constant-pressure water supply system is good in energy conservation and good in use effect and meets the requirements of actual use.

The invention provides a water-based self-drying casting paint, and a preparation method and an application method. According to the invention, 1-3% of sodium-based bentonite and water 1-1.5 times the weight of bentonite are uniformly stirred with high speed; the mixture is added in a sealed container and is subjected to standing, where the mixture is sufficiently wetted and activated, such that a liquid A is prepared; 0.1-0.4% of sodium carboxymethyl cellulose is dispersed by using ethanol with a concentration no lower than 95% according to a weight ratio of 1:1; water with an amount 30-50 times that of the mixture is added; the mixture is uniformly stirred and is subjected to standing and sufficient initiation; the mixture is mixed with the liquid A; the obtained mixture is stirred with a proper amount of water; a composite suspension is prepared by grinding by using a colloid mill; the suspension is mixed and grinded with 60-71% of mullite, 0.05-0.1% of a wetting agent, and 4-6% of a modified phosphate binder, such that a pasty paint is prepared; and the pasty paint is diluted by using water, such that the paint is obtained. After a reaction with an alcohol-based paint comprising magnesia powder, the paint can be self-dried. Therefore, cost of independent use of an alcohol-based paint or a water-based paint is greatly reduced, and the influence to the environment is greatly ameliorated.

A process for preparing big-aperture draw die with plated diamond layer includes choosing the drawing hard alloy die as substrate with aperture greater than 15 mm, corroding the hole surface by diluted hydrochloric acid and H2O2, washing, and depositing diamond layer and nano diamond layer on the hole surface in a reaction chamber by electrothermal wire CVD method. In said CVD method, an electrothermal wire assembly composed of more electrothermal wires are used. Its advantages are high thickness and quality of plated layer, low friction coefficient and long service life.

The invention discloses an electromagnetic shielding waterborne paint and a preparation method thereof, which belong to the field of electromagnetic shielding paints. The paint consists of the following components in percentage by weight: 30 to 50 percent of emulsion, 10 to 30 percent of flaky metal powder, 0.5 to 2 percent of dispersant, 0.2 to 1 percent of wetting agent, 0.5 to 3 percent of leveling agent, 0.5 to 1.5 percent of antifoaming agent and 25 to 40 percent of water. The preparation method comprises the following steps of: stirring and dissolving the dispersant, the wetting agent and a part of antifoaming agent in deionized water; mixing the flaky metal powder in solution and stirring at a high speed; adding the emulsion into the mixture, stirring and mixing; and adding the leveling agent and the remaining antifoaming agent into the mixture and stirring. The paint of the invention can achieve the shielding efficiency of between 60 and 85 dB in the frequency range of between 100 kHz and 1.5 GHz; and an obtained coating has basically invariable surface resistivity after being stored in a natural state for more than 6 months and is suitable for building systems and other electromagnetic protection systems with environmental protection requirements.

The invention discloses an electric power field warehouse material management system, comprising a basic data module, a stock management module and a material taking management module. The basic data module comprises material information, material classification and system management. The stock management module comprises stock, material warehousing and checking, wherein the stock comprises stock gathering and itemizing stock; the checking comprises inventory profits and inventory losses. The material taking management module comprises warehouse-out recording, material taking application form filling, reservoir area navigation, application list details configuration, material taking navigation and warehouse-out completion. On the premise of meeting operation and use requirements, the electric power field warehouse material management system can rapidly and efficiently realize in-out stock management of electric power field warehouse materials, timely and accurately connect to a stock database system, greatly improve electric power field material running efficiency, possess better safe performance, and meet real use requirements.

The invention provides a cleaning preparation for porcelain glazes and glass utensils. The cleaning preparation comprises solid acid, carbonate and / or hydrogen carbonate, thickener and / or stabilizer and surfactant and further comprises disinfecting agent, aromatic agent, deodorant and dispersant. By using the cleaning preparation, cleaning of various porcelain glazes and glass utensil products can be completed easily; the cleaning preparation belongs to environment-friendly products and is good in cleaning effect and safe, convenient and nontoxic to use.

The invention discloses a power grid fault information release and processing system, which includes a power grid system, a dispatching data network, a headquarters, a fault information release system and a user terminal. The power grid system is connected with the command center and the fault information release system through the dispatching data network. The information release system is connected to the user end, and the power grid system includes a fault information analysis system. The fault information analysis system is connected with parameter configuration, early warning unit, fault data collection and fault information analysis; fault data collection is connected with fault information entry and fault information collection ; The fault information analysis is connected with the power outage area, power outage range, transformer in the station area, power outage time, power outage reason, release channel and voltage fault. The invention can determine the cause of the failure in time, automatically release messages, and cooperate with the command system to take effective solutions, so as to facilitate the rapid recovery of the safe operation of the power grid system, has better safety performance, and meets the actual use requirements.

The invention discloses a mechanical vibration reducing device. The mechanical vibration reducing device comprises a base and two sets of damping separation plates; fixed screw holes 1 are formed in the base; fixed screw holes 2 are formed in the damping separation plates; connecting thread rods are arranged in the fixed screw holes 1 and the fixed screw holes 2, and are provided with adjusting nuts; elastic vibration reducing damping columns are arranged between the base and the damping separation plates; chutes are formed in two inner side walls of the damping separation plates; vibration reducing brackets are arranged between two chutes; connecting grooves 1 are formed in the vibration reducing brackets; connecting grooves 2 are formed in the base; and hydraulic vibration reducing damping mechanisms are arranged between the connecting grooves 1 and the connecting grooves 2. The mechanical vibration reducing device is excellent in vibration reducing effect, can reduce the oil consumption to the greatest extent, can reduce the wear of parts of the vibration reducing device to the greatest extent, is stable in performance in the vibration reducing process, is convenient for installation and disassembly, saves both time and labors, greatly improves the mechanical vibration reduction working efficiency, is better in safe use performance, and satisfies actual use requirements.

The invention relates to a PBAT melt-blowing degradable non-woven fabric and a manufacturing method thereof. The manufacturing method comprises: blending 100 parts of dried PBAT, 10-50 parts of dried polylactic acid, 5-30 parts of dried polycaprolactone, and 0-10 parts of compatilizer for 3-10 min, through a screw extruder, heating, melting, and extruding the above to form a melt, when the melt is extruded from the spinneret orifice of a die head, the melt being blown by high-pressure hot airflow on two sides of the spinneret orifice, and being stretched to superfine fibers and coagulating on a drum-type receiver which is a certain distance away from the nozzle, the superfine fibers bonding to form a non-woven fabric, after being cooled, taking the non-woven fabric down from the drum and putting the non-woven fabric in a drying oven to dry and shape, to obtain the PBAT melt-blowing degradable non-woven fabric. Compared with the prior art, the method is simple in device, short in process flow, and low in energy consumption. Using the melt-blowing method to manufacture the non-woven fabric, fibers of the non-woven fabric are thin in diameter, and the non-woven fabric is characterized by large specific surface area, high porosity, and excellent filter efficiency.

The invention discloses a glass fiber wound reinforced polyurethane resin conical electric pole. The glass fiber wound reinforced polyurethane resin conical electric pole comprises a root portion and a tip portion; the outer diameter of the root portion is larger than that of the tip portion; the wall thickness of the root portion is larger than that of the tip portion; the glass fiber wound composite material conical electric pole also comprises an equal thickness layer and a thickness gradient layer, wherein the equal thickness layer is located on the outer side and the thickness gradient layer is located on the inner side; the equal thickness layer is formed by alkali-free glass fiber axial fabrics or alkali-free glass fiber multi-directional fabrics through winding; the thickness gradient layer is formed by one of alkali-free glass fiber direct yarns, alkali-free glass fiber axial fabrics and alkali-free glass fiber multi-directional fabrics through winding; the pavement length of the alkali-free glass fiber direct yarns, the alkali-free glass fiber axial fabrics or the alkali-free glass fiber multi-directional fabrics of the thickness gradient layer is retracted from the tip portion to the root portion layer by layer. According to the glass fiber wound reinforced polyurethane resin conical electric pole, the utilization rate of the glass fiber mechanical properties and the production efficiency of a composite material pole tower can be improved and the manufacturing cost of the composite material power transmission pole tower is reduced. The invention also discloses a production method of the glass fiber wound reinforced polyurethane resin conical electric pole.

The invention discloses a thin-walled antistatic halogen-free flame retardant PC / ABS (polycarbonate / acrylonitrile-butadiene-styrene) composition and a preparation method thereof. The antistatic PC / ABS composition comprises, by weight, 50-70 parts of PC resin, 8-12 parts of ABS resin, 1-3 parts of toughening agents, 10-14 parts of flame retardants, 10-20 parts of antistatic mother substances and 0.4-1 part of other auxiliaries. The self-made efficient antistatic mother substances, antistatic agents and conductive carbon black are kneaded, polycaprolactam serves as a carrier, and the prepared antistatic halogen-free flame retardant PC / ABS composition has permanent antistatic effects, high flowability and high toughness and thin-walled flame resistance, is simple in processing flow and can be used for injection molding of various thin-walled antistatic flame retardant products.

The invention relates to a material of the cylinder body of a pneumatic actuating mechanism and a preparation method thereof. The material is composed of the following components in percentage by weight: 0.4 to 0.7% of Fe, 1 to 2.5% of Cu, 0.6 to 1.0% of Mg, 0.15 to 0.2% of Mn, 1 to 2% of Ni, 1.5 to 2.5% of Zn, 0.4 to 0.6% of B2O3, 1.5 to 2.5% of SiO2, 1 to 3% of TiC, and the balance being Al. The cylinder body is prepared by the following steps of blank preparation, blank pretreatment, mould pretreatment, forging and stamping, and moulding. The prepared cylinder body has the characteristics of high hardness, good corrosion resistant performance, little thermal expansion coefficient, low friction index, and high wear resistant performance. At the same time, the manufacture technology is improved to enable the cylinder body to have a good mechanical performance.

The invention discloses a zinc-base alloy bearing based on a solid lubricating agent. The zinc-base alloy bearing comprises a self-lubricating bearing outer ring, a self-lubricating bearing inner ring, self-lubricating bearing balls and self-lubricating bearing sealing covers. An outer ring ball limiting and mounting groove is formed in the inner side face of the self-lubricating bearing outer ring, and an inner ring ball limiting and mounting groove is formed in the outer side face of the self-lubricating bearing inner ring. The self-lubricating bearing outer ring and the self-lubricating bearing inner ring are each provided with multiple solid lubricating agent imbedding holes. The axes of the multiple solid lubricating agent imbedding holes are each arranged in the radial direction of the self-lubricating bearing outer ring and the self-lubricating bearing inner ring. The multiple solid lubricating agent imbedding holes are formed around the outer ring ball limiting and mounting groove and the inner ring ball limiting and mounting groove and connected with the outer ring ball limiting and mounting groove and the inner ring ball limiting and mounting groove. The zinc-base alloy bearing has the beneficial effects of being convenient to assemble, high in mechanical strength and good in lubricating effect.

The invention discloses a 7.6-micron front cut-off infrared optical filter and a making method thereof. The optical filter is characterized in that: single crystal germanium (Ge) with the size of phi 25.4*1.0mm is used as a substrate, the surface aperture N of the substrate is less than or equal to 5, the local aperture delta N is less than or equal to 0.5, the parallelism theta is less than or equal to 1', and the surface finishment is superior to 60 / 40; zinc sulfide (ZnS) and single crystal germanium (Ge) are used as coating materials, and a plurality of layers of interference films are respectively deposited on two surfaces of the single crystal Ge substrate; Sub absolute value 2.42(0.5HL0.5H)<8>3.0(0.5HL0.5H)<7> Air is adopted in the design of a first side film system; Sub absolute value 1.2(0.5HL0.5H)<6>1.6(0.5HL0.5H)<7>2.32(0.5HL0.5H)<6> Air is adopted in the design of a second side film system; according to the adopted evaporation process conditions, heating and baking of below 300 DEG C are performed in a vacuum environment with the vacuum degree of less than or equal to 10<-3>Pa, and a physical vapor deposition mode and ion source aided coating are adopted; and the 7.6-micron front cut-off infrared optical filter has excellent signal-to-noise ratio and good background interference suppression. The optical filter can be widely used for detecting the temperature of a far infrared object.

The invention discloses a steam type high fineness and no-weldlines injection moulding process for a complex precise plastic product. The process comprises the following steps: (1) material selection; (2) backheating treatment; (4) mold preheating; (5) die assembly and quick heating; (6) speed-regulating and pressure-regulating injection in stages; (7) quick cooling; and (8) mold opening to take piece. According to the process disclosed by the invention, corresponding backheating treatment is performed on a material body, so that the internal stress problem of the material body is solved; then, an injection mold is of a design of a hot runner and a cold runner multipoint feeding subsurface gate, and meanwhile, the travel times of the corresponding hot runner and cold runner are added for a key portion of a product, so that the problems that a plastic melt is slow to flow at a far end to generate sink marks and the internal stress exists and the like are solved, and therefore, the appearance quality and the forming percent of pass of the product are extremely improved, the process cost and the like are reduced, and the actual using demand is met.

The invention discloses a preparing method of a gear for a fuel delivery pump, which comprises the following steps that a gear blank is molded by casting, and the gear blank comprises the following chemical components by weight percent: 2.85 to 3.25% of C, 1.2 to 1.5% of Si, 0.8 to 1.2% of Mn, 0.6 to 0.8% of P, 0.05 to 0.07 of S, 0.24 to 0.35% of Cr and 0.7 to 0.9% of Cu; the temperature of the gear blank which is molded by casting is lowered to 300 DEG C, then the gear blank is heated to 650 to 760 DEG C, and the temperature is kept for 3 to 5 hours; furnace cooling is performed, so that the temperature of the gear blank is lowered to 300 DEG C, and the temperature is kept for 4 hours; then the gear blank is heated to 650 to 760 DEG C, and the temperature is kept for 17 hours; and finally, the gear blank is cooled to 450 DEG C at a cooling rate of 50 DEG C / hour and then cooled to 140 DEG C at a cooling rate of 20 DEG C / hour. The preparing method has the advantages of no axial component in the process of engagement, large overlap coefficient, good use performance, low noise, strong bearing capacity, smooth transmission, high efficiency and large bending resistant strength.

The invention discloses a preparation method of a microarc oxidation-tungsten dioxide self-lubricating composite ceramic layer. Sodium silicate, sodium hexametaphosphate, ammonium metavanadate and an anionic dispersing agent are mixed and dissolved to obtain mixed solution; thio-ammonium tungstate performs ultrasonic water bath dissolving by de-ionized water, is added with a wetting agent, and is added in the mixed solution; the ultrasonic wave and the mechanical stirring effect are synchronously applied, so that added reagents are fully dissolved and dispersed to prepare electrolyte containing WS42-; a circulating cooling water device is started; a pretreated metal sample is connected to an electric conducting rod to dip in the electrolyte as an anode; a stainless steel electrolytic cell also serves as a cathode; a microarc oxidation power supply is started for microarc oxidation; and then, the drying is performed to obtain the microarc oxidation-tungsten dioxide self-lubricating composite ceramic layer. The prepared ceramic layer is smooth in surface, uniform in thickness, high in compactness and firm in combination with a basal body, has such prominent advantages as low friction factor and wear rate and excellent self-lubricating performance, and satisfies actual application requirements.

The invention discloses a self-adaptive quick setting method of an auto iris driving voltage value, which comprises the steps of initializing a driving voltage value, acquiring component data of an image Y / C, computing image brightness values, comparing the brightness values, computing the driving voltage value and the like. The method quickly computes and sets the parameters of the auto iris driving voltage value according to the conditions of the image brightness value and the driving voltage value, is compatible with the application of auto iris lenses with different models, and has the functions of inspecting the change state of the image brightness in real time and updating the driving voltage value of the auto iris in time according to the new change condition.

The invention relates to an optimization design method for a blade root, in particular to the optimization design method for the blade root of a compound propeller blade, and aims to solve the problem that molded surfaces between adjacent propeller blades are often overlapped when a blade root connection form designed by the conventional design method is applied to a ship propeller, and the diameter of a propeller hub is relatively smaller, so that the propeller blades and the propeller hub cannot meet the use requirements. The optimization design method comprises the following steps: drawing a geometrical model of a compound propeller through a three-dimensional entity configuration software; calculating the hydrodynamic performance of the compound propeller by utilizing an RANS (Reynolds-Averaged Navier-Stokes) equation so as to build a geometrical model of the compound propeller blade with the wedge-shaped blade root; and calculating stress distribution of the propeller blade and the blade root through a finite element analysis software so as to finally finish optimization design of the blade root. The optimization design method is applied to transportation tools such as naval vessels.

The invention discloses a low temperature impact resistant modified polyvinyl chloride cable material. The cable material is prepared from the following raw materials in parts by weight: 20 to 40 parts of polyvinyl chloride resin, 10 to 15 parts of PET resin, 5 to 9 parts of modified carbon fiber, 2 to 4 parts of nano silicon dioxide, 2 to 4 parts of zinc oxide, 6 to 8 parts of montmorillonite powder, 12 to 14 parts of sepiolite powder, 4 to 6 parts of kieselguhr, 3 to 5 parts of butadiene acrylonitrile rubber powder, 2 to 4 parts of ACR, 1 to 3 parts of TPEE, 4 to 6 parts of DEHP, 0.5 to 1.5 parts of calcium-zinc stabilizer, 1 to 2 parts of calcium stearate, 0.5 to 1.5 parts of ageing resistant agent, 0.3 to 0.5 part of antioxidant, 22 to 24 parts of carbon black, 6 to 8 parts of cyanuric acid tripolycyanamide and 12 to 16 parts of auxiliary agent. The cable material processed and formed by the invention has good low temperature resistance, impact resistance, flame retardance and mechanical property, an application range of the cable material is improved, ingredients and a preparation technology of the cable material are simple, saving cost and reducing labor intensity are achieved, and the cable material can meet an actual use requirement.

The invention relates to a damper for a skip bucket guide wheel support. The damper comprises a tubular outer adjusting sleeve, a tubular inner adjusting sleeve arranged in the outer adjusting sleeve, a guiding sleeve with the two open ends, and a damping guide column matched with an inner cavity of the guiding sleeve. The inner adjusting sleeve and the outer adjusting sleeve are movably connected. A cover cap is movably connected with the guiding sleeve. At least four symmetrically distributed axial sliding grooves are formed in the side wall of the guiding sleeve. A first spiral spring is arranged in an inner cavity of the cover cap. Sliding rods matched with the sliding grooves are arranged at the head end of the damping guide column. An annular piston matched with an inner cavity of the inner adjusting sleeve, and a second spiral spring matched with the damping guide column are further arranged in the inner adjusting sleeve. The damper for the skip bucket guide wheel support is easy to use, the adjusting gap of the damper can reach 60-150 mm, and the damper is high in comprehensive utilization rate, convenient and rapid to mount and maintain, good in damping effect, sensitive in buffer damping action, high in response speed, good in implementation effect and high in application value.

The invention discloses an industrial rolling shaft workpiece cutting device comprising a base. A first clamping base and a second clamping base are arranged at the two ends of the base; a clamping oil cylinder is arranged on the first clamping base and provided with a first centre capable of freely rotating; the second clamping base is provided with a second centre; a rotary motor is arranged at one end of the second centre; the base is further provided with an inverted-U-shaped frame, and a movement mechanism, a hydraulic power system, a hydraulic lifting transmission oil cylinder and a cutting device are arranged on the top of the inverted-U-shaped frame; the base is further provided with a carrier roller mechanism which is provided with a rolling shaft workpiece; and groove holes connected with the first centre and the second centre are formed in the two sides of the inverted-U-shaped frame. The industrial rolling shaft workpiece cutting device achieves cutting operation on a rolling shaft, it is avoided that because the rolling shaft is likely to roll, the cutting operation risk exists, the vibration amplitude of the cutting operation is reduced, stability is good, the cutting precision is high, the labor intensity of manual operation is reduced, and the actual using requirement is met.

The invention provides a USB (universal serial bus) flash drive type FPGA (field programmable gate array) development board comprising a selector key, a USB interface, and a circuit board. The selector switch is used for controlling the USB flash drive type FPGA development board to switch between a USB mode and a development board mode. The circuit board connected with the selector key and the USB interface is provided with a USB unit and a development board unit. The USB unit connected with the USB interface and the selector key is used for allowing the USB flash drive type FPGA development board to switch between the USB mode and the development mode according to action of the selector key. The development board unit comprises an FPGA chip, a JTAG (joint test action group) interface, and a plurality of learning components connected with the FPGA chip. The FPGA is connected with the USB unit. The JTAG interface is connected between the USB interface and the USB unit. The USB flash drive type FPGA development board has smaller development board area, is portable and is more targeted.

The invention discloses an M3C pre-charging method based on staggered grouping. According to the invention, on the premise that the capacitor voltage of an M3C system is charged, the pre-charging timeis shortened as much as possible and the control is simple, the pre-charging voltage can still reach a required set value when the input side (charging power supply) is relatively low and the numberof sub-module capacitors is relatively large and the voltage is relatively high, and meanwhile, the sub-module capacitor voltage is balanced. On the basis of the analysis, a grouping method is reformulated instead of simply dividing into two types, and an interleaved charging method is used at the same time, so that the charging time difference is reduced as much as possible, and the capacitor voltage is prevented from changing greatly after the charging is completed.

The invention provides a numerical forecasting method for cavitation noise of a composite propeller, and the method comprises the following steps: building a geometric model of the propeller through three-dimensional configuration software according to the design size of the propeller; completing the construction of a hydrodynamic model; establishing a finite element model of the composite propeller by utilizing finite element software; carrying out cavitation performance simulation calculation on the composite material propeller to obtain a cavitation numerical simulation result, and obtaining the difference between the hydrodynamic performance and the cavitation performance of the composite material propeller and the metal material propeller; storing a cavitation numerical simulation result obtained in the fluid analysis software; constructing an acoustic calculation model of the composite propeller, and setting a plurality of monitoring points in the acoustic calculation model; and comparing and analyzing attenuation change rules of the cavitation radiation noise at different positions. According to the method, the vibration noise radiation condition of the propeller can be well predicted, and reference is provided for low-noise propeller design.

A two-stage vortex dry vacuum pump is disclosed. The outer circumferential side of a first vortex working cavity is communicated with an air inlet in a left vortex fixed disc. At least one airflow channel is disposed along the radial direction in a vortex moving disc. One end of each airflow channel is communicated with the center side of the first vortex working cavity, and the other end is communicated with the outer circumferential side of a second vortex working cavity. The center side of the second vortex working cavity is communicated with an air discharging channel and an air discharging port in a right vortex fixed disc. The outer circumferential side of the vortex moving disc and the outer circumferential side of the right vortex fixed disc are hermetically connected through a corrugated pipe. The outer circumferential side of the first vortex working cavity and the outer circumferential side of the second vortex working cavity are sealed and separated by the corrugated pipe. The corrugated pipe, the vortex moving disc and the right vortex fixed disc are connected through flanges or welding. The two-stage vortex dry vacuum pump breaks the limitation on the compression ratio and the final vacuum of two-side vortex dry vacuum pumps at present, and increases the compression ratio and the final vacuum of the vacuum pump by two-stage continuous compression of the two vortex working cavities connected in series.

The invention discloses an intelligent office table for enterprises. The intelligent office table comprises cabinet bodies, the cabinet bodies comprise the first-level cabinet body, the second-level cabinet body and the third-level cabinet body, each cabinet body is provided with a mounting area, each mounting area is internally provided with an upper mounting groove, a lower mounting groove, a left mounting groove and a right mounting groove, and intelligent rotating pieces are arranged among the multi-level cabinet bodies; drawers are arranged among the multi-level cabinet bodies, and the two sides of each drawer are provided with sliding blocks; elastic clamping blocks are arranged among the multi-level cabinet bodies; an operation platform is arranged above the first-level cabinet body, a control panel is arranged below the third-level cabinet body, and the control panel is internally provided with a control system. The intelligent office table is combined with intelligent technology, the office table is pushed to intelligence, the operation and control system is arranged, powerful functions in work and life can be achieved through the office table, tedious operation of working personnel is avoided, labor intensity of working personnel is relieved, meanwhile rapid development of the enterprises is promoted, it is beneficial to management, and actual application requirements are met.

The invention discloses a sewage purification filter system which comprises a shell, wherein both sides of the shell are respectively provided with a water inlet and a water outlet; sewage enters the shell via the water inlet, sequentially flows through a flow-deflection conditioning zone, a multilayer filter system, an intermittent region, a facultative anaerobic precipitation region, a buffer region, an aerobic region, a secondary precipitation region and a water discharge tank, and finally flows out of the water outlet; the multilayer filter system sequentially comprises a solid particle filter layer, an organic matter filter layer and a pebble layer from top to bottom; an aerobic region filler is suspended in the aerobic region; and the bottom of the aerobic region is provided with a micropower aerating system. The system implements integrated treatment on rural domestic sewage, has favorable treatment effect, and can thoroughly remove toxic harmful condensates in domestic sewage, thereby enhancing the recovery and reutilization efficiency of domestic sewage, saving the water resources and lowering the economic investment cost. The system is suitable for popularization and application, has favorable safety performance, and satisfies the actual use requirements.