1696 results about "Filter paper" patented technology

The invention relates to a method for detecting pyridine in air, a test paper sheet is placed in an air environment to be detected, the color change of the test paper sheet is observed, the pyridine concentration is qualitatively judged or quantitatively judged according to the color change of the test paper sheet, and the test paper sheet is made of a filter paper sheet and a zinc-based organic-inorganic hybrid halide material. According to the method, qualitative or semi-quantitative judgment of the pyridine concentration in the air can be performed by adopting a test paper sheet and a color card or a linear correlation model standard curve graph, so that whether the pyridine content in the air exceeds the standard or not or the exceeding amplitude can be monitored, and the method has the advantages of convenience in operation and more convenience in detection.

The invention provides a nuclear facility aerosol nuclide activity monitoring device, which comprises a detector shell, the outer wall of the detector shell is provided with a detector interface, an air inlet pipe interface and an exhaust pipe interface, the air inlet pipe interface is outwards connected with an air inlet pipeline, and the exhaust pipe interface is outwards connected with an exhaust pipeline; the radiation detector is connected to the detector interface; the paper feeding mechanism is arranged in the detector shell and comprises filter paper which extends between the detection end of the radiation detector and the air inlet pipe connector; the output end of the moving assembly is connected with the filter paper; the shielding body assembly comprises an external shielding body and an internal shielding body, the radiation detector is sleeved with the external shielding body, the internal shielding body is arranged in the detector shell, and the filter paper is located between the detection end of the radiation detector and the internal shielding body. According to the invention, the change condition of the activity concentration of the aerosol radionuclide in the airborne effluent can be obtained in time.

The invention relates to the technical field of metal material sample preparation, in particular to a preparation method for extracting carbon replica of steel for a high-carbon wire rod. The method specifically comprises the following steps: S1, preparing a sample; s2, immersing the sample into a nitric acid alcohol solution; s3, placing the sample in a sample chamber of a high-vacuum coating instrument, evaporating a carbon film with the thickness of 10-20 nm on the surface of the sample, and taking out the sample after vacuum is relieved; s4, performing electrolytic film removal by adopting an electrolytic polishing corrosion instrument; s5, after the carbon film falls off, the nitric acid alcohol on the carbon film is cleaned until the absolute ethyl alcohol in the weighing bottle is colorless; s6, the carbon film is transferred into deionized water, after the carbon film is fully unfolded, the carbon film is fished up through a transmission electron microscope and a copper net and placed on filter paper, and the carbon film is tightly attached to the copper net; and S7, baking the carbon film sample adhered to the copper mesh for 30-60 seconds, and placing the dried sample under an electron microscope for observation to complete the preparation of the steel extraction carbon replica sample for the high-carbon wire rod. The method has the advantages of high demolding speed, complete and firm carbon film form, simple configuration and low cost.

The invention discloses an ionic type rare earth ore body pressurization, permeation and shearing combined test device. The device comprises a shear box, a load system, a dynamic permeation structure, a graded filtration structure, a data assembly and a processing terminal, the load system is used for applying a horizontal load and a vertical load to the shear box; the dynamic permeation structure is used for containing a leaching solution and enabling the leaching solution to flow into the shear box; the graded filtration structure is used for collecting a leaching solution reacted with the rare earth ore body sample and acquiring graded filtration analysis data; the data assembly is used for summarizing monitoring data in the penetration and shearing processes; the processing terminal is used for controlling; the shear box comprises an upper box, a lower box, an upper seepage pressing plate, a lower seepage pressing plate, an upper filter screen plate, a lower filter screen plate, a cover plate, a microporous metal plate and filter paper. According to the invention, the integration of fine simulation and penetration and shear test of the in-situ ore leaching injection-production process is realized, and a test basis can be provided for in-situ ore leaching injection-production parameter design, rare earth ore body stability analysis and disaster risk assessment.

The invention relates to the technical field of engine oil filters, in particular to a multistage filtering engine oil filter which comprises a shell, a filter paper frame is coaxially arranged in the shell, the surface of the filter paper frame is coaxially sleeved with a rough filtering inner sleeve, and the surface of the rough filtering inner sleeve is movably sleeved with a rough filtering outer sleeve capable of moving up and down. First filter holes for rough filtration are uniformly distributed in the surfaces of the rough filtration inner sleeve and the rough filtration outer sleeve, the rough filtration outer sleeve moves up and down to enable the first filter holes in the rough filtration outer sleeve and the first filter holes in the rough filtration inner sleeve to be in a staggered closed state, a lower opening is formed in the lower end of the shell, and a collecting cover is coaxially mounted at the lower end of the shell; the invention aims to solve the problem that after the bypass valve of the engine oil filter is opened, impurities attached to filter paper are easily separated from the filter paper and flow to the positions of all oil-consuming parts of an engine through the bypass valve along with engine oil.

The invention discloses a soil body-structure rough interface multi-included-angle shear test device and an operation method thereof. The test device comprises an upper shear box, a lower shear box, a loading system and a data acquisition instrument, a pressure transfer plate, porous stone, filter paper and a shear sample are arranged in the upper shear box, and a sawtooth shear surface module, a corner control assembly and a limiting torque measurement assembly are arranged in the lower shear box; the sawtooth shearing surface module is provided with sawtooth patterns and guide ribs, the corner control assembly is provided with a deflection angle guide groove, a suspension circular truncated cone and a torsion-resisting sector ring, and the limiting torque measurement assembly comprises a circular truncated cone limiting groove, a sector ring limiting groove, a tapered roller bearing, a miniature pressure sensor and a spiral pre-pressing structure; the loading system comprises a horizontal loading system and a vertical loading system. According to the device and the method, diversified interface rough grain inclination angles can be simulated, the sawtooth grain trend is kept constant in the shearing period, the interface shearing torque is accurately tested, and reliable support can be provided for comprehensive evaluation of pile-soil interaction performance in rotary excavating pile and screw pile reinforcing engineering.

The utility model relates to the technical field of industrial system air purification filters, and particularly discloses a V-shaped filter which comprises a filter element, a rubber line and an outer frame. And the filter element is positioned on an air circulation path in the filter and is formed by folding a whole piece of filter paper. The glue line is a continuous glue line and is adhered to the surface of the filter paper, and two ends of the glue line coincide with two ends of the filter paper. The outer frame is located on the peripheral side of the filter element, abuts against the filter element and is bonded with the glue line. The air filter has the effects of improving the purification air volume and meeting the industrial waste gas purification requirement.

The invention relates to the technical field of suction filtration, and particularly discloses a negative pressure suction filtration device which comprises a base, a funnel and a suction filtration bottle which are distributed from top to bottom are arranged on the base, a filter paper alternation structure capable of replacing filter paper is arranged between the funnel and the suction filtration bottle, and the funnel and the filter paper alternation structure are detachably connected with each other. The filter paper alternation structure and the suction filtration bottle are detachably connected with each other; through a rotating disc and an intermittent driving mechanism of the filter paper alternating structure, the filter paper can be automatically replaced under the condition that the whole device is not disassembled, and the operation continuity and efficiency are greatly improved; the first elastic pressing structure and the second elastic pressing structure ensure that the lower abutting pipeline is tightly attached to the upper annular sliding groove and the upper abutting pipeline is tightly attached to the lower annular sliding groove through the elastic force of the spring, the sealing effect of the first sliding cover and the sealing effect of the second sliding cover are combined, liquid leakage under the condition that the filter paper is automatically replaced is effectively prevented, and it is guaranteed that the negative pressure environment is stable.

The invention discloses beryllium element detection test paper as well as a preparation method, a detection method and application thereof. The beryllium element detection test paper comprises a filter paper base material, a color developing agent chrome azurol S and a shielding agent ethylene diamine tetraacetic acid disodium salt, the color developing agent chrome azurol S and the shielding agent disodium ethylene diamine tetraacetate are loaded on the filter paper base material. When the beryllium element detection test paper is used for detecting a surface beryllium pollution detection object, the detection method is simple and rapid to operate, high in sensitivity and low in cost.

The invention discloses a dynamic paper feeding control method for double-probe aerosol monitoring, and relates to the field of environmental monitoring instrument manufacturing. The method comprises the following steps: acquiring a currently set paper feeding mode of the aerosol detection device, and performing paper feeding control on filter paper of the aerosol detection device according to a filter paper target displacement corresponding to the paper feeding mode; acquiring a corresponding real-time accumulated pulse number after the aerosol detection device starts paper feeding control, and stopping paper feeding when a paper feeding stopping condition is met; acquiring the perimeter of the positioning shaft and the number of pulses per circle; real-time displacement is determined according to the perimeter of the positioning shaft, the number of pulses in each circle and the number of real-time accumulated pulses; and correcting the real-time displacement according to the target displacement of the filter paper, and dynamically controlling the filter paper of the aerosol detection device again according to the corrected real-time displacement. According to the invention, actual transportation positioning of the filter paper in different paper feeding modes is considered and correction is carried out, so that huge deviation of the detection efficiency of the monitor and serious distortion of a measurement energy spectrum can be avoided.

The invention discloses an assembling device and method of a high-efficiency filter in the technical field of machining and assembling, and aims to solve the problems that in the prior art, the process of detaching and replacing filter paper of the high-efficiency filter by a customer is complicated, and the quality is easy to cause problems. The assembly line comprises an assembly line used for conveying folded filter paper, the assembly line is sequentially provided with a gluing assembly, a screen plate placing assembly, a side plate assembly assembly and a connecting strip assembly assembly from upstream to downstream, the upstream and the downstream of the assembly line are divided into a first section and a second section respectively, and the feeding width of the second section of the assembly line is smaller than the length of the filter paper; a jacking conveying line is further arranged on the side of the upstream position of the second section of the assembly line, and a second conveying line is further arranged on the side of the downstream position of the second section of the assembly line. The invention is used for providing a new filter paper assembly mode, so that the efficient filter equipment of a customer can be efficiently replaced according to the customer demand, the manual operation error can be reduced while the assembly efficiency is guaranteed, and the assembly efficiency and quality are better.

The utility model discloses an air filter element which comprises an inner framework, an outer framework, filter paper, an upper end cover and a lower end cover, the outer framework is V-shaped, and an opening structure is formed in the upper end position of the outer framework; the inner framework is arranged in the outer framework and is V-shaped, and an opening structure is also formed in the upper end position of the inner framework; the lower end position of the outer framework and the lower end position of the inner framework form a closed structure through the lower end cover; a closed structure is formed between the upper end position of the outer framework and the upper end position of the inner framework through the upper end cover; a through hole is formed in the upper end cover, and the through hole is communicated with the interior of the inner framework; the filter paper is laid between the outer framework and the inner framework to form a filtering surface. The performance of the air filtering system can be improved, so that a cleaner and healthier air environment is provided.

The invention relates to a variable-step-pitch radioactive aerosol filter paper taking mechanism and a detection device, the variable-step-pitch radioactive aerosol filter paper taking mechanism comprises a mounting bracket, a paper feeding auxiliary adjusting mechanism is arranged on one side of the mounting bracket, and a detection device body is arranged on one side of the mounting bracket; according to the device, the stepping motor is arranged to drive the winding action of the filter paper tape body, and the transmission shaft, the winding rod and the speed-adjustable control system are matched, so that the fine control of the sampling spacing is realized, and the device is suitable for the collection requirements of radioactive aerosols with different strengths or periods; the step pitch can be flexibly set according to actual working conditions, the use efficiency of filter paper is improved, the response capacity of a monitoring system to sudden radioactive events is enhanced, meanwhile, error accumulation is avoided through coordinated arrangement between the paper feeding mechanism and the detection device body, closed-loop control over the sampling and detection process is achieved, and the detection efficiency is improved. And the precision and the practicability of the whole device can be improved.

The embodiment of the invention provides a radioactive aerosol continuous monitoring device. The radioactive aerosol continuous monitoring device comprises a sampling chamber (1), sampling filter paper (3) and a measuring chamber (2), the sampling chamber (1) is arranged in front of the measuring chamber (2) in the horizontal direction; the sampling chamber (1) comprises a vertically arranged air sampling inlet pipe (13) and a centripetal particle size separation sampler (11) which is arranged below the air sampling inlet pipe (13) and is used for separating radioactive aerosol according to different particle sizes; and the sampling filter paper (3) is arranged below the centripetal particle size separation sampler (11) and is used for receiving the radioactive aerosol separated by the centripetal particle size separation sampler (11). The radioactive aerosol is separated through the centripetal particle size separation sampler, the problem of particle slippage does not exist, the collection efficiency of radioactive particles can be effectively improved, the detection sensitivity and accuracy of the radioactive aerosol are improved, and continuous monitoring of the radioactive aerosol in the air is achieved.

The invention discloses a paper feeding device and method for a radioactive aerosol activity monitor, and belongs to the technical field of nuclear radiation measuring instruments. The device comprises a paper feeding case and perforated filter paper; a paper feeding power assembly and a filter paper supporting assembly are arranged in the paper feeding case, and the paper feeding power assembly comprises a main motor and an auxiliary motor; the filter paper supporting assembly comprises a first filter paper shaft and a second filter paper shaft; a photoelectric switch is arranged on the second filter paper shaft; the method comprises the following steps: 1, mounting filter paper; 2, feeding filter paper; and 3, paper feeding detection. Through a dual-motor mode, the perforated filter paper is synchronously controlled to move, and the fault that the filter paper slips or is stacked under the condition that a driven shaft is loosened under the condition of a single motor, or the filter paper is broken due to the fact that the motor pulls the filter paper under the fastening condition is solved; the unstable factors that under the condition of a traditional single motor, the tightness degree of the driven shaft cannot guarantee the standard performance of adjustment every time due to manual non-standard adjustment and the driven shaft can be gradually loosened and needs to be adjusted again can be directly removed, and the operation stability of the whole device is guaranteed.

The application discloses a new device for pre-acidification process combined with cathode buffer zone electric dynamic remediation of heavy metal contaminated soil and a construction method, and belongs to the field of electric dynamic remediation of heavy metal contaminated soil. The device comprises a soil remediation chamber and a sewage treatment chamber. The soil remediation chamber is open at the top, is provided with an anode plate on one side, and is provided with a cathode plate on the opposite side. Filter paper is attached to the two sides of the anode plate and the cathode plate. The cathode plate is further provided with a cathode buffer chamber opposite the anode plate. The anode plate and the cathode plate are connected through wires, a power supply and a sensor. The soil remediation chamber is connected with the sewage treatment chamber on the side provided with the cathode plate, and a gap is formed between the soil remediation chamber and the sewage treatment chamber to allow liquid to flow from the soil remediation chamber into the sewage treatment chamber. The sewage treatment chamber is provided with adsorption material. The sewage treatment chamber is provided with a drainage hole and a drainage pipe at the bottom end. The method can effectively remove heavy metals in sewage and can avoid the possibility of secondary pollution of the environment caused by electric dynamic remediation of sewage.

The utility model relates to the technical field of detection, in particular to a quick detection device for diffusivity and permeability of missible oil. The problems that an existing method for detecting the permeability of the missible oil is complex and high in cost, and a device for rapidly detecting and comparing the diffusivity of the missible oil is lacked in the prior art are solved. The device comprises a hollow shell, and the shell internally comprises an anti-seepage layer used for blocking seepage of missible oil and a seepage and diffusion layer arranged on the upper portion of the anti-seepage layer from bottom to top; the permeation and diffusion layer comprises a preset number of layers of rapid qualitative filter paper or printing paper with an upward smooth surface, and a first preset number of concentric circles are uniformly distributed on each piece of filter paper or printing paper; each concentric circle comprises a second preset number of circles with the same circle center and different radiuses, a preset distance is formed between every two adjacent circles on the same concentric circle, and an automatic reading assembly is arranged in the device. By observing the permeation and diffusion of the missible oil on the permeation and diffusion layer, the permeability and diffusivity of the missible oil are judged according to the number of the permeated and diffused layers, and the diffusivity and permeability of the missible oil are intuitively, quickly and simply obtained.

The invention belongs to the technical field of hydrogen sulfide detection, and discloses a batch quantification method for bacterial endogenous hydrogen sulfide yield. Materials (qualitative filter paper, a 96-well plate and a lead acetate solution) used in the method are cheap commercially available consumables, a used gel imaging system is also a laboratory basic instrument, and Fili imageJ is widely used free image processing software. Therefore, the method has the advantages of low cost, simplicity in operation, capability of quickly quantifying in batches and the like. Besides, membrane covering of the qualitative filter paper enables each pore of the 96-pore plate to be relatively closed, and meanwhile, different from a color developing agent directly added into the bacterial liquid, the measuring position is located above the bacterial liquid, so that accurate quantification is achieved, and growth and metabolism of bacteria are not affected at the same time. The method not only can realize accurate quantification, but also can detect the yield of hydrogen sulfide of different bacteria in batches, and is convenient to popularize and apply.

The utility model relates to the technical field of water treatment devices, in particular to a pretreatment device for detecting the concentration of suspended solids in a water body, which comprises a water sample layering device, the water sample layering device comprises a filter cup, a connecting pipe communicated with the filter cup, an extension piece communicated with the connecting pipe and a connecting branch pipe communicated with the connecting pipe, one end, far away from the connecting pipe, of the connecting branch pipe is arranged in the filter cup; a liquid leakage switch is arranged on the connecting pipe and is arranged between the filter cup and the connecting branch pipe; the filtering funnel is connected with the extension piece in a sealing manner and is used for filtering substances from the water sample layering device; the suction flask is in sealed connection with the filtering funnel and is used for containing filtrate filtered by the filtering funnel; and the suction pump is connected with the suction flask. The pretreatment device disclosed by the utility model can shorten the filtering time, improve the filtering efficiency, reduce the frequency of replacing the filter paper, save consumables and improve the accuracy of a detection result at the same time.

The invention discloses o-phthalaldehyde disinfectant concentration detection test paper and a preparation method thereof.The preparation method comprises the steps that S1, a color developing agent, a color developing accelerant and a stabilizer are dissolved in purified water, a solution A is prepared, and the color developing agent accounts for 0.1-10 wt%, the color developing accelerant accounts for 0.1-10 wt%, and the stabilizer accounts for 0.1-10 wt%; s2, the filter paper is completely soaked in the liquid A for 1-2 min, and the filter paper is dried after being completely soaked; s3, uniformly dissolving a film-forming agent in purified water to prepare 0.1-10wt% of a solution B; s4, immersing the filter paper dried in the step S2 into a solution B, continuing for 10-30s, and then drying; and S5, cutting the dried filter paper, and pasting the cut filter paper on a substrate paperboard to obtain the phthalic dicarboxaldehyde disinfectant concentration detection test paper. The test paper for detecting the concentration of the o-phthalaldehyde disinfectant has the advantages that the validity period is as long as 2 years, the color development effect is stable, and the concentration of the o-phthalaldehyde disinfectant can be effectively and accurately reflected.

The invention belongs to the technical field of air compressor accessories, and particularly relates to an air compressor oil filter which comprises a shell, filter paper is coaxially mounted in the shell, a rotary cover and an end cover are arranged at the two ends of the filter paper respectively, the air compressor oil filter further comprises a partition plate, and the partition plate is arranged at the position, close to the end cover, in the shell. A backwashing opening is formed in the center of the partition plate, a bypass opening is coaxially formed in the center of the end cover, a frustum is arranged in the center of the rotary cover, a sealing assembly capable of sealing the frustum and the bypass opening at the same time is movably installed in the shell, and an engine oil connector used for backwashing filter paper is connected to the end, away from the end cover, of the partition plate of the shell. Engine oil for backwashing the filter paper circularly flows between the interior of the shell and the engine oil connector; according to the invention, the normal use of the air compressor oil filter can be ensured by regularly backwashing the filter paper without disassembling the shell or replacing the filter paper, so that the service life of the air compressor oil filter is effectively prolonged.

The utility model provides a filter paper taking and placing device for air detection. The filter paper taking and placing device for air detection comprises a base and an adjusting mechanism arranged on the base. The adjusting mechanism comprises an electric telescopic rod, a motor box, an adjustable-speed motor, a supporting column, a time relay and a collecting box, the electric telescopic rod is fixedly installed on the top of the base, the motor box is fixedly installed on an output shaft of the electric telescopic rod, and the adjustable-speed motor is installed in the motor box; and the supporting column is rotationally mounted at the top of the motor box. According to the filter paper taking and placing device for air detection, through cooperation of the adjusting mechanism and the taking and placing assembly, the filter paper taking and placing device for air detection has the advantages that the structure is simple, the up-down rotating function is achieved, multi-directional air collection can be conducted, and the air collection effect is improved.

The invention relates to the technical field of substance detection, in particular to a paper-based chip for detecting cadmium ions by LIBS (Laser-induced Breakdown Spectroscopy) as well as a preparation method and application of the paper-based chip. The preparation method comprises the following steps: 1) mixing a zinc salt solution and a sodium sulfide solution, and reacting to obtain a ZnS nano-particle solution; (2) mixing the ZnS nano-particle solution, polyvinylpyrrolidone and an acid solution to obtain a ZnSNPs (zinc single nucleotide polymorphisms) modified solution; and 3) mixing the ZnSNPs modified solution with a filter paper sheet, oscillating, adding an alcoholic solution, cleaning and drying. The paper-based chip provided by the invention can efficiently enrich the heavy metal element cadmium in the water body so as to carry out LIBS detection, and high-sensitivity, rapid and efficient detection of the heavy metal Cd in the water body can be well realized by combining the LIBS technology with the provided paper-based chip.

A method for preparing baking soda from baking soda desulfurized fly ash comprises the following preparation steps: step 1, dissolving baking soda desulfurized fly ash in water to obtain a mixed solution A; 2, filtering the mixed solution A through microporous filter paper or a filter membrane to obtain supernate B; step 3, mixing and stirring the supernate B and a precipitant C for 1-5 hours to obtain a mixed solution D; step 4, filtering the mixed solution D through microporous filter paper or a filter membrane to obtain a supernatant E; step 5, adding 1-8% of a regulator F into the supernate E, and uniformly stirring to obtain liquid G; step 6, continuously adding aeration H into the liquid G, and adjusting the pH to be alkaline to obtain a solution J; 7, the solution J is heated, evaporated and crystallized, solid crystals are obtained and fully ground, and regenerated baking soda can be obtained; the preparation method is simple, the recovery rate of baking soda is high, and large-scale batch production can be carried out.

The HEPA filter element type waterproof dust collection bag comprises a plastic bag body and a main body plastic part, the plastic bag body is fixedly connected with the back face of the main body plastic part, a dust collection channel and a filter element installation chamber are arranged in the main body plastic part, a front air outlet is formed in the front face of the main body plastic part, and a rear air outlet is formed in the back face of the main body plastic part. A front dust suction opening is formed in the front face of the main body plastic part, a rear dust suction opening is formed in the back face of the main body plastic part, the rear dust suction opening and the rear air outlet are communicated with the interior of the plastic bag body, a filter element made of HEPA filter paper is installed in the filter element installation chamber, and the periphery of the filter element is bonded with the main body plastic part through hot melt adhesive. The HEPA filter element type waterproof dust collection bag is good in waterproof performance, the filtering effect cannot be affected by moisture, and the dust collection bag is convenient to use and long in service life. The filter element formed by the HEPA filter paper is good in filtering effect and can effectively intercept garbage such as dust. The dust collector can be used for absorbing water without worrying that the dust collection bag is affected by moisture.

The invention discloses a dust-free environment purification method for biological pharmacy. Comprising the following steps: constructing three layers of metal filter screens, realizing particle interception through a conical micro-column array, an Al2O3 / TiO2 composite ceramic layer and a diamond-like carbon film, fixing lysozyme by adopting a crystal face regulated ZIF-8 crystal, and realizing dual inactivation of microorganisms by combining dielectric barrier discharge of a spiral plasma channel. The electrostatic adsorption HEPA filter paper adopts a BaTiO3-graphene quantum dot composite electret substrate, and a TiO2 / graphene heterojunction catalytic layer is decomposed by a Pt-Co bimetallic nanocluster and a photocatalysis-plasma-ozone-thermocatalysis quadruple oxidation system; and 0.1 mu m organic aerosol triggers graded reverse pulse cleaning based on differential pressure integration and a particle concentration threshold value, and the honeycomb flow guide structure drives a shutter and a gradient density sintering metal flow guide plate through piezoelectric ceramics to maintain laminar flow uniformity. According to the scheme, the limitation of a traditional technology is broken through, the purification efficiency of 0.1 micron particles is improved, and a high-stability solution is provided for a biopharmaceutical clean room.

The utility model relates to the technical field of coffee brewing auxiliary tools, in particular to a paper pressing device and a coffee brewing tool assembly. The paper pressing device comprises a central connecting part, the side edge of the central connecting part is connected with a plurality of annularly distributed paper pressing blocks, each paper pressing block comprises a paper pressing part used for being connected with filter paper in an abutting mode, and the side face of each paper pressing part comprises an inclined pressing face with the lower end inclining inwards. By arranging the paper pressing device, the cake filter paper is pressed by the paper pressing device before coffee is brewed, so that the cake filter paper does not deform greatly in the brewing process, coffee is convenient to brew, and the difficulty of brewing skills is reduced.

The invention relates to a roller grinding cutting fluid impurity cleaning device which comprises a filtering box body provided with a liquid inlet and a liquid outlet, a magnetic attraction assembly is arranged in the filtering box body, a conveying mesh belt is arranged under the liquid outlet of the filtering box body, filtering paper is laid on the surface of the top of the conveying mesh belt, and the filtering paper is arranged in the filtering box body. And an oil collecting box body is arranged at the bottom of the conveying mesh belt, and a floating foam fishing assembly is arranged in the oil collecting box body. According to the impurity cleaning device for the cutting fluid for roller grinding, the cleanliness of the cutting fluid can be improved, the filtering capacity is high, the filtering efficiency is high, and the effect is good.

The invention discloses a method for preparing multifunctional oil-water separation paper through ZIF-67 in-situ growth on the surface of polydopamine coated fiber, and belongs to the technical field of preparation of fiber materials and composite materials thereof. The problems existing in an existing oil-water separation material preparation technology are solved. The method comprises the following steps: filter paper surface pretreatment; growing the MOF particles; and hydrophobic treatment. The product provided by the invention has self-cleaning and organic oil separation performances; the polydopamine and the silane with amino have rich amino, so that the polydopamine and the silane with amino have very high positive charge density during protonation, bacteria with negative charges can be attracted through electrostatic interaction, and the polydopamine and the ZIF-67 particles have a synergistic effect, so that the polydopamine and the ZIF-67 particles have an excellent inhibition effect on staphylococcus aureus. Oriented growth and controllability of MOF particles are achieved through loading of polydopamine on the surfaces of the fibers, and the super-hydrophobic paper is obtained; the method is simple, the process is easy to control, the cost is low, pollution is avoided, the oil-water separation performance is excellent, and the oil-water separation and antibacterial performance is achieved while the economic value of the filter paper is improved.

The present application relates to a system and method for measuring particulate matter emissions from vehicle tire wear under actual driving conditions. The measurement system includes: a sampling module connected to a main sampling tube equipped with a main flowmeter; a particulate matter quantity measurement module connected to the main sampling tube and used to measure the concentration of particles sampled from the main sampling tube and their sampling flow rate; a particulate matter mass sampling module connected to the main sampling tube and used to sample from the main sampling tube and collect particulate matter through filter paper; and a data processing module signal-connected to the particulate matter quantity measurement module and the particulate matter mass sampling module. The data processing module calculates the quantity and mass of particulate matter emissions from the vehicle's tire wear under actual driving conditions based on data measured by the particulate matter quantity measurement module, the main flowmeter, and filter paper weighing data. The present application can truly restore the working scene of the vehicle's tires under actual driving conditions, and the measured tire particulate matter emission results are highly accurate.