1958results about How to "Guaranteed filtering effect" patented technology

The present invention relates to a controllably-released bioceramic thrombus filter and its preparation method. Said thrombus filter is made up by using laser engraved metal tube, its end portion is equipped with a combination portion matched with a conveying portion, its centre is equipped with an elastic wire and its surface is convered with a layer of bioceramic membrance. It can be temporarily placed into blood vessel of human body, also can be permanently placed in the blood vessel of human body. Said invention also provides the concrete working principle of said thrombus filter.

The invention discloses an active power filter device based on a coupled inductance, which is composed of a signal acquisition module, a main control module, a drive module, a power conversion module and an LCL filter module based on a coupled inductance. The steps of extracting command current are as follows: first, extract sinωt and cosωt which are synchronized with grid A-phase voltage ua through digital phase-locked loop; secondly, transform the three-phase grid current into dqo coordinates to obtain current id, iq in dqo coordinate system , io; the third is to perform digital low-pass filtering on id and iq to extract their DC components; the fourth is to inversely transform io, sinωt and cosωt to dqo coordinates; the fifth is to perform subtraction to obtain the three-phase grid current The fundamental reactive and harmonic currents in . After hysteresis comparison control, PWM gating signals and trigger pulses are generated to control the orderly on-off of each IGBT in the power conversion module to generate PWM voltage, which is filtered by the filter module and then injected into the grid for compensation.

The invention relates to a curtain hollow fiber film. Wherein, the single hollow fiber is U-reverse shaped; the upper part of bended single film is inserted with insert tube; two ends of film line are irrigated in one irrigation casting box; two rows of film lines have exposure tube between them. The invention changes the former upright irrigation casting structure into U-shape structure, while the upper end avoids irrigation fixing but the round tube fixing; therefore, the upper film line can move in some range, and the exposure gas can pass the film line, to avoid accumulating mud between lines, to improve the filter property.

The invention provides an unpowered automatic cleaning laminated filter, which comprises a shell and a filter element, wherein the shell is a cylinder with end covers at two ends; a water inlet and a water outlet are arranged on the two end covers or at positions close to the end parts of the cylinder; the filter element consists of a group of hollow filter discs and a water outlet core pipe; the hollow filter discs are sleeved on the water outlet core pipe; a distance is kept between each two adjacent hollow filter discs; the effluent of the hollow filter discs flows into the water outlet core pipe; and one end of the water outlet pipe is closed, while the other end is provided with a water outlet, which is connected with the water outlet of the filter or directly serves as the water outlet of the filter. The filter also has a washing device which comprises a cleaning brush holder, a cleaning brush, a driving device and a mounting frame, wherein the mounting frame is connected with the driving device; the cleaning brush is fixed on the mounting frame; the head of the cleaning brush is positioned on the surface of the annular filter discs; and the cleaning device is driven by the driving device to rotate to realize the cleaning of the filter discs. The filter can be used for filtering ship ballast water, cooling water and the like.

The invention discloses a cigarette filter tip composite material, which is characterized by consisting of the following components in percentage by mass: 30 to 90 percent of polylactic acid fibers and 10 to 70 percent of cellulose acetate fibers which form a network structure through splitting and physical entanglement and the adhesion of surface points. The invention also discloses a method for preparing the cigarette filter tip composite material. The polylactic acid fibers selected by the invention have the advantages of abundant sources, low cost and good processability, and the polylactic acid fibers are used to replace part of the cellulose acetate fibers and are used as the cigarette filter tip composite material, so that the production cost of cigarette filter tips can be reduced greatly, the production efficiency is improved, and the problems of environmental contamination, resource shortage, high cost and the like which are caused by the production of the cellulose acetate fibers are reduced. The preparation method provided by the invention has the advantages of simple and mature process and easy operation.

The invention discloses full-automatic concrete mixing equipment capable of realizing proportioning. The full-automatic concrete mixing equipment is characterized in that a bottom frame is fixedly connected to the bottom end of a mixing drum, a discharging opening is fixedly connected to the position, corresponding to the top of the bottom frame, of the outer end of the mixing drum, a gravel feeding mechanism is fixedly connected to one side of the top end of the mixing drum, the other side of the top end of the mixing drum is fixedly connected with a cement feeding mechanism, the side edge ofthe outer end of the mixing drum is fixedly connected with a water control mechanism, and a stirring mechanism is embedded inside the mixing drum. The equipment is scientific and reasonable in structure and safe and convenient to use; the gravel feeding mechanism is arranged, a rotating motor drives first rotating rods to rotate, and through cooperation of transmission gears, two first rotating rods drive two rough grinding rollers to rotate together to crush gravel, and meanwhile, through belt transmission, the two first rotating rods drive the two second rotating rods to rotate together, sothat the two fine grinding rollers are driven to rotate, and the gravel and cement mixing effect is improved.

The invention discloses an automobile exhaust treatment device capable of being installed at the tail end of an exhaust pipe. The device comprises a mounting body, wherein a gas inlet with a leftwardopening is formed in the left side in the mounting body, a filter plate is fixedly arranged in the gas inlet, the filter plate can block carbon material in exhaust to the left side, a carbon scrapingdevice is arranged on the upper side of the gas inlet, a scraping plate is arranged in the carbon scraping device, the scraping plate can scrape off accumulated carbon on the left end face of the filter plate, the filtering effect of the filter plate is improved, and the right side of the gas inlet communicates with a ventilation cavity. By installing the device at the tail end of the exhaust pipe, the installation stability is ensured by internally pressing tightly the exhaust pipe and clamping the outer end surface of the exhaust pipe, the exhaust flow is utilized for continuously scraping off the accumulated carbon on the filter plate, the filtering effect is ensured, the phenomenon that blockage is caused, so that exhaust emission is influenced is avoided, and meanwhile, the installation and disassembly of the device are very convenient, so that the installation cost and maintenance cost are reduced.

The invention discloses a system and a method for treatment and recovery of electronic electroplating wastewater. The system comprises a wastewater recovery and treatment unit and an RO (reverse osmosis) concentrate treatment unit. A grille, an adjusting tank, a coagulation reaction device, a settlement and membrane separation device, an ozone oxidation tank, an ozone digestion tank, a cartridge filter and an RO device are connected to the wastewater recovery and treatment unit sequentially. A hydrolytic acidification tank, a contact oxidation tank and a settling tank are connected to the RO concentrate treatment unit. The electronic electroplating wastewater is treated through the grille, the adjusting tank, the coagulation reaction device, the settlement and membrane separation device, the ozone oxidation tank, the ozone digestion device, the cartridge filter and the RO device. RO fresh water is then reused on an electronic electroplating line. RO condensed water is effectively treated through the hydrolytic acidification tank and the contact oxidation tank and stably meets the primary specification GB8978-1996 of integrated wastewater discharge standard, and discharge requirements DB4426-2001 of discharge limits of water pollutants of Guangdong.

The invention relates to the field of small household appliances, in particular to a direct quantitative control method for indoor air purifier filter screen replacement. According to the direct quantitative control method for indoor air purifier filter screen replacement, a mass threshold value is set, and then controlling is conducted through the following steps that after a filtering assembly is installed, the initial weight of the filtering assembly is obtained through a weight sensor, when a filter starts working, a controller obtains the current weight of the filtering assembly by reading the weight sensor in real time, the filtrate weight is obtained by subtracting the initial weight from the current weight, and when the filtrate weight exceeds the mass threshold value, the controller controls an alarming mechanism to give an alarm. According to the method, the weight of particulate matter attached to a filter screen is obtained by monitoring the weight added value of the filtering assembly in real time, when the weight of the attached particulate matter exceeds the mass threshold value, the filter screen needs to be replaced, therefore, quantitative control over filter screen replacement is achieved, the replacement cycle of the filter screen reaches the maximum value while the filtering efficiency is guaranteed, and the method is more beneficial for being used by an ordinary family.

The invention discloses an intelligent filter control method. The method comprises the following steps: cyclically filtering electroplating liquid during normal operation, performing real-time monitoring and starting cleaning according to requirements, performing first-time emptying treatment before cleaning is needed, and returning filtrate remaining in a filter into an electroplating liquid medicine tank through a filtrate outlet of the filter; cyclically and forwardly cleaning the filter by using medicine cleaning water; performing backward gas-water mixed washing on the filter, and mixing gas and water to form cleaning foam; stopping backward gas-water mixed washing, performing second-time emptying treatment, returning the medicine cleaning water remaining in the filter into a cleaning tank from a to-be-filtered liquid inlet of the filter, and then emptying the cleaning tank to recycle the medicine cleaning water; mixing gas and clean water to backwardly washing the filter; after cleaning is completed, draining waste water in the filter from the to-be-filtered liquid inlet of the filter to a waste water drain outlet. The filter control is precise, the filter is cleaned in real time, a filter element does not need to be replaced, the cost is reduced, and the production cost of an enterprise is reduced by recycling the electroplating liquid.

A three-pass band filter comprises a non-conductive substrate, an input feeder line and an output feeder line, a defect ground type resonant structure and a short circuit stub type resonant structure are arranged on the two surfaces of the substrate respectively, and the input feeder line and the output feeder line are arranged on the surface of the substrate having the short circuit stub type resonant structure and are located between the defect ground type resonant structure and the short circuit stub type resonant structure, wherein the input feeder line, the short circuit stub type resonant structure and the output feeder line are coupled to form a first radio frequency access possessing a first pass band and a third pass band, and the input feeder line, the defect ground type resonant structure and the output feeder line are coupled to form a second radio frequency access possessing a second pass band. According to the present invention, the defect ground type resonant structure and the back laminated short circuit stub type resonant structure form the three pass bands of the three-pass band filter, so that the three-pass band filter is simple in structure, guarantees a filtering effect, and enables the reliability to be improved.

The present invention relates to a preparation method of a polyacrylonitrile-based precursor, and mainly solves the problems that in the prior art bubbles in a material sprayed out by a filter cannot be completely eliminated, spinnability is poor, wire broken rate is high, and a carbon fiber precursor obtained by spinning is low in strength and unstable in performance. The preparation method well solves the problems, and the preparation method includes the following steps: 1) solvent dimethyl sulfoxide, first monomer acrylonitrile, a second monomer itaconic acid and initiator azodiisobutyronitrile are polymerized to obtain a spinning stock solution, and a high performance polyacrylonitrile copolymer spinning stock solution is obtained by filtering after demonomerisation and defoaming of the spinning stock solution; nascent fiber is obtained by jet extrusion and consolidation forming; and a high-performance polyacrylonitrile carbon fiber precursor is obtained by drawing, water washing, oiling, compacting by drying, steam stretching, heat-setting and collection of the nascent fiber; and the method can be used for the industrial production of the carbon fiber precursor.

The invention discloses a purifying separator. The purifying separator comprises a rectangular box, stand columns are arranged at the four corners of the bottom of the rectangular box, an air inlet is formed in the outer side surface of the lower end of the rectangular box, an air outlet is formed in the upper surface of the rectangular box, and a residue discharge port is formed in the lower surface of the rectangular box; a beam is arranged in the rectangular box, a motor is fixedly installed on the beam, a vertical rotating shaft is fixedly connected with a rotating end of the motor and fixedly sleeved with multiple layers of blades, multiple partition plates are arranged on the portion, located at the upper end of the beam, in the rectangular box, an active carbon layer is arranged on the lower surface of each partition plate, and multiple through holes are uniformly distributed in each partition plate; a tiny metal sorting and collecting mechanism is arranged in the residue discharge port, and a controller is arranged on the outer surface of the rectangular box. The purifying separator has the advantages of being simple in structure and high in practicability.

The present invention discloses a Kalman filter channel-based pulse stacking correction method which mainly solves the problems in the prior art that the calculation is complex, an energy spectrum distorts, etc. The method comprises the following steps of utilizing a pulse shaper to generate a nuclear pulse signal Sn, obtaining the nuclear pulse signal Sn and then initializing the parameters of the nuclear pulse signal Sn, namely, selecting an initial point where the amplitude X0 of the outputted nuclear pulse signal Sn is 0; carrying out the weak signal removing processing on the nuclear pulse signal Sn, and obtaining the stacked nuclear pulse signals S1n; determining and extracting the stacked nuclear pulse signals S1n; constructing a Kalman filter state and measurement equation, and using a Kalman filter to process the extracted nuclear pulse signals S1n to obtain the nuclear pulse signals S2n; attenuating the nuclear pulse signals S2n, and determining whether to satisfy a removingstandard. By the above scheme, the Kalman filter channel-based pulse stacking correction method of the present invention achieves the purpose of separating the stacked pulse events, and has the very high practical value and popularization value in the nuclear radiation detection, the nuclear electronics technology and the digital signal processing fields.

The invention provides an asymmetrical stainless steel filter membrane tube and a production method thereof. The asymmetrical stainless steel filter membrane tube produced by the production method for the asymmetrical stainless steel filter membrane tube comprises a support layer and a control layer and is characterized by further comprising stainless steel fiber felts between the support layer and the control layer. According to the asymmetrical stainless steel filter membrane tube disclosed by the invention, the stainless steel fiber felts are additionally arranged among different powder layers, so that the filtering precision and the filtering performance of the filtering tube in performance are ensured; and meanwhile, the problems of cracking, peeling and the like of the stainless steel filter membrane with mutant fluctuant gradient in the sintering process are solved to the great degree.

The invention discloses an FPGA based guide filter and an achieving method thereof. The FPGA based guide filter comprises a signal controller, an average filtering module, a parameter calculating module, an addressing dereferencing module, a state judging device, a data cache and a comprehensive operation module. The achieving method of the FPGA based guide filter is combined with an FPGA chip, fully utilizes a characteristic that large-scale parallel operation of the FPGA is easy to achieve and improves the operation speed and reduces the complexity level of the guide filter hardware design while ensuring the filter effect. A filtering treatment parallel structure is given wholly, and the filtering speed is improved. The binary division operation is improved in an addressing dereferencing mode, hardware achievement is facilitated, and the system running time is shortened. A binary division algorithm is improved through the judging device, and the system reliability is improved.

The invention discloses a dust collection device with a filtering net cleaning function. The dust collection device comprises a dust collection tank, wherein a first chute and a second chute are respectively formed in the inner side wall of the dust collection tank; the second chute and the first chute are respectively formed in the upper side and the lower side of an air inlet tube; the first chute and the second chute are respectively connected with a first drawer and a second drawer in match in a sliding manner; an opening is formed in the second drawer; a filtering net is fixedly connectedwith the opening; a fan is fixedly arranged at the top of the dust collection tank; an exhaust tube is connected with the air inlet end of the fan; the exhaust tube penetrates through the top wall ofthe dust collection tank; a plurality of rotating shafts are arranged at equal heights in the left direction and the right direction inside the dust collection tank; a plurality pieces of brush hairare fixedly connected with the rotating shafts; and the brush hair is propped against the bottom of the filtering net. The filtering net is convenient to replace or clean and is low in maintenance cost, and the filtering net can be cleaned through rotation of the brushes, so that impurities such as dust adhered to the filtering net can be swept off, the filtering net then can be recycled and reuse, and the cost can be reduced.