363 results about "Composite filter" patented technology

The invention discloses a cyclone separation and moving particle bed coupled pulverized coal pyrolysis oil gas high-temperature dust removal system, and belongs to the technical field of coal clean utilization. The system comprises a cyclone separator, a fine filtration unit, a filter material cyclic regeneration unit and an intelligent control unit, the fine filtration unit comprises a particle bed, a particle bin is arranged at the top end of the particle bed, and a composite filter material layer is arranged on the particle bed; a dust-containing high-temperature oil gas pipeline and a pretreatment high-temperature oil gas pipeline are arranged at the top end of the cyclone separator, dust-containing high-temperature oil gas is introduced into the cyclone separator through the dust-containing high-temperature oil gas pipeline to be pretreated, and the pretreated dust-containing high-temperature oil gas is introduced into the particle bed through the pretreatment high-temperature oil gas pipeline to be finely filtered; and a coke breeze discharge pipe is arranged at the bottom of the cyclone separator. The invention is used for solving the technical problem of low gas-solid separation efficiency at high temperature caused by the adoption of a single filter material in the existing pulverized coal dust removal system.

The invention relates to the technical field of gas adsorption materials, in particular to a plasma modified UiO-66-NH2 / activated carbon composite filter material as well as a preparation method and application thereof. The preparation method comprises the following steps: adding activated carbon into a UiO-66-NH2 precursor solution, vacuumizing in a vacuum drying oven for 1-3 hours, then transferring into a reaction kettle, heating to 80-120 DEG C, reacting for 20-25 hours, cooling to room temperature, washing and drying to obtain a UiO-66-NH2 / activated carbon composite material; and placing the UiO-66-NH2 / activated carbon composite material in a plasma reactor, and carrying out plasma treatment by taking H2 / Ar as a working gas to obtain the plasma-modified UiO-66-NH2 / activated carbon composite material. According to the invention, UiO-66-NH2 is loaded in the activated carbon, so that the effects of increasing the specific surface area of the activated carbon and developing a microporous structure are achieved, the adsorption capacity of low-concentration trichloro ethylene reaches 281 mg / g, and the UiO-66-NH2 loaded activated carbon is a filter material for effectively adsorbing trichloro ethylene (TCE).

The utility model discloses a composite filter element and a purifier, and belongs to the technical field of purification, the composite filter element comprises an activated carbon layer and a carbon fiber layer which are laminated; and / or the composite filter element comprises a composite layer, and the composite layer comprises activated carbon powder and carbon fibers. According to the composite filter element disclosed by the utility model, the setting thickness of the activated carbon can be reduced through the high adsorption capacity of the carbon fibers, so that the overall volume of the composite filter element is reduced. Therefore, the volume of the filter element can be reduced on the premise of ensuring the adsorption efficiency, and the problems of overlarge volume and the like of the filter element with high adsorption performance in the prior art are solved.

The utility model provides a composite filter element device and water purification equipment, and the composite filter element device comprises a shell which is provided with an inner cavity, a raw water inlet, a primarily filtered water outlet, a primarily filtered water inlet, a pure water outlet and a wastewater outlet, and the primarily filtered water outlet is communicated with the primarily filtered water inlet; the first filtering module is arranged in the inner cavity, is communicated with the raw water inlet and the primarily filtered water outlet, and is used for filtering water output by the water supply device; the second filtering module is arranged in the inner cavity, the second filtering module and the first filtering module are sequentially arranged in the length direction of the shell, a primary filtered water inlet flow channel is defined by the outer wall of the second filtering module, the outer wall of the first filtering module and the cavity wall of the inner cavity, and one end of the primary filtered water inlet flow channel communicates with the primary filtered water inlet; the other end of the primary filtered water inlet flow channel is communicated with the second filtering module; the second filtering module is communicated with the pure water outlet and the wastewater outlet. The overall size of the composite filter element device can be reduced, so that the space occupied by the composite filter element device in the water purification equipment can be reduced.

This utility model relates to the field of coolant filtration and discloses a concentrated coolant-composite filtration device with a quickly replaceable filter screen. The device includes a filter, a cooling water pipe fixedly connected to the top left side of the filter, a cooling plate installed outside the cooling water pipe, a cooling fan fixedly installed at the front end of the cooling plate, a filter screen cylinder placed inside the filter, a threaded sleeve fixedly connected to the center of the bottom of the filter screen cylinder, and a threaded opening at the top of the filter. This concentrated coolant-composite filtration device with a quickly replaceable filter screen filters particulate impurities contained in the coolant through the filter screen cylinder. Simultaneously, a magnetic rod inside the filter screen cylinder can adsorb metallic impurities mixed in the coolant, enhancing the filtration effect as the coolant passes through the filter screen cylinder. Cleaning is simple; just pull the ring to remove the magnetic rod from the limiting bracket for cleaning, thus solving the problem of poor filtration effect.

The utility model belongs to the technical field of part cleaning, and particularly relates to a cleaning device for maintenance and repair of spare and accessory parts of a generator set, which comprises a cleaning tank, cleaning fluid is contained in the cleaning tank, a lifting mechanism is fixed on the rear side of the cleaning tank, and a containing leakage tank is fixed in the lifting mechanism; according to the cleaning device, spare and accessory parts are contained through the containing leakage groove and then soaked in cleaning liquid in the cleaning groove, the spare and accessory parts are cleaned in cooperation with work of an ultrasonic cleaning instrument, and after cleaning is completed, the spare and accessory parts can be cleaned through the containing leakage groove; cleaning liquid can be pumped into the filter box through the pump body and treated through activated carbon and a composite filter membrane, so that impurities doped in the cleaning liquid are removed, finally, the cleaning liquid is stored through the storage box, repeated utilization of the cleaning liquid is facilitated, and the cost is saved.

The utility model belongs to the technical field of cigarette filter stick production, and particularly relates to a ternary composite filter tip for improving the comfort level of an ultra-low tar cigarette, which consists of a paper filter stick section, a quality-improving and aroma-enhancing section, a special-shaped hollow core section and molding paper, and the paper filter stick section, the quality-improving and aroma-enhancing section and the special-shaped hollow core section are sequentially arranged from a tobacco shred end to an inlet end and are wrapped and fixed by the molding paper. The ternary composite filter tip has the functions of reducing tar, guaranteeing the physiological satisfaction of smoking, improving the comfort level and fragrance quality of smoke and improving the state of the smoke, the hollow core structure can be designed into various shapes, and the purpose of novel and unique appearance is achieved.

The invention discloses a Yellow River raw water coagulation-sand filtration-ultrafiltration treatment system and method based on a composite filter material, and belongs to the technical field of water treatment. The device comprises a coagulation unit, a sand filtration unit and an ultrafiltration unit which are sequentially connected in the water flow direction. Wherein the sand filtration unit is filled with multiple layers of composite filter materials, and the composite filter materials sequentially comprise an aluminum ion modified quartz sand layer, an aluminum ion modified quartz sand layer and an aluminum ion modified quartz sand layer from top to bottom, the granular active carbon layer is used for deeply adsorbing and removing small molecular organic matters; and the manganese sand layer is used for catalytically removing iron and manganese ions and is used as a supporting layer for stabilizing the filter bed. The method comprises the following steps: carrying out coagulation treatment on Yellow River raw water, introducing the treated Yellow River raw water into the composite sand filtration unit, carrying out deep pretreatment, and filtering the pretreated Yellow River raw water through the ultrafiltration membrane. According to the method, through gradient filtration and function cooperation of the composite filter material, the synchronous removal efficiency of turbidity and UV254 can be remarkably improved, high-quality inlet water is provided for an ultrafiltration membrane, membrane pollution is effectively controlled, system operation energy consumption is reduced, and the method has the advantages of being low in resource consumption, little in environmental pollution, good in economic benefit and the like.

The application discloses a circulating water purification treatment process for heat exchange equipment and relates to the technical field of circulating water purification treatment, and comprises the following steps: preparing a polyaspartic acid-silane functionalized graft intermediate; selecting a porous zeolite matrix and performing acid activation treatment; immersing the matrix in sol, standing for defoaming, and performing temperature rising calcination to obtain a nano TiO2-coated zeolite matrix coated with nano titanium dioxide on the surface; immersing the nano TiO2-coated zeolite matrix in a solution, stirring and reacting after adjusting the pH value of the solution to obtain PASP functionalized zeolite filter material; immersing the PASP functionalized zeolite filter material in a silver nitrate solution, performing photocatalytic reduction, reducing and depositing silver ions in situ, and obtaining silver / titanium dioxide-polyaspartic acid synergistic functionalized composite filter material. Through the synergistic composite filter material, efficient scale inhibition and sterilization and rapid purification are realized, excellent stability and durability are exhibited under harsh working conditions such as high temperature and long period, the application is environment-friendly, and the maintenance cost is low.

The utility model relates to the technical field of water purification devices, and discloses a high-flow water purification device with a built-in pressure tank, which comprises a computer board, the bottom of the computer board is fixedly connected with a filling pump, the output end of the filling pump is communicated with the pressure tank, the right side of the pressure tank is fixedly connected with an RO (reverse osmosis) membrane, the right side of the RO membrane is provided with a T33, and the right side of the T33 is provided with a water outlet. And a composite filter element is arranged on the right side of the outer wall of the T33, a bottom plate is fixedly connected to the bottom of the filling pump, the bottom plate plays a supporting role, and anti-skid pads are fixedly connected to the left side and the right side of the bottom of the bottom plate correspondingly. According to the composite filter element, when water passes through the composite filter element, the water firstly passes through the activated carbon layer to remove different colors, peculiar smell and part of chemical substances in the water, and meanwhile, trace metal ions in the water can be adsorbed by the activated carbon layer to further optimize the water quality, so that the taste of the water is improved, and the water becomes more sweet and refreshing; therefore, the requirements of users are met, and the using effect of the device is improved.

The utility model discloses a dehydrating and decoloring device for white oil after extraction, and relates to the technical field of lithium batteries. A liquid inlet is formed in the upper end of the tank body, and a liquid outlet is formed in the bottom of the tank body; the composite filter layer is arranged in the tank body, the tank body is divided into an upper cavity and a lower cavity by the composite filter layer, and the composite filter layer is used for filtering impurities and water in the white oil. According to the utility model, white oil separated by the centrifugal machine can be filtered, impurities and water in the white oil are filtered out, and the recycling requirement is met; power equipment does not need to be arranged, so that the production cost is remarkably reduced, emission of greenhouse gases such as carbon dioxide generated by power generation is reduced, and positive significance is achieved for environmental protection.

The present application relates to sludge treatment technical field, specifically disclose a kind of vertical extrusion type sludge treatment system and method, including cloth mechanism and filter pressing mechanism, cloth mechanism is used to deliver composite filter cloth with sludge clamped to filter pressing mechanism;Filter pressing mechanism includes: filter pressing cavity, for realizing composite filter cloth stacking and filter water;At least one movable filter assembly is arranged in extrusion cavity along vertical direction;Hydraulic mechanism is used to exert vertical pressure on the composite filter cloth stacked in filter pressing cavity.The present application is at least one movable filter assembly arranged in extrusion cavity along vertical direction, and adaptive design is carried out to movable filter assembly, so that in the process of composite filter cloth stacking, not only will not affect filter cloth stacking, and using movable filter assembly separates the support to stacked composite filter cloth, beneficial to the flow of upper layer water to lower layer, and movable filter assembly has extrusion effect to the composite filter cloth on its two sides, can improve filter pressing effect.

The utility model provides an air purifier which comprises a shell provided with an airflow channel, and the airflow channel penetrates through the two opposite sides of the shell; the condensation filter screen is arranged at the air inlet end of the airflow channel and is used for uniformly distributing and condensing the inlet airflow; the composite filter element is arranged in the airflow channel, located between the air inlet end and the air outlet end of the airflow channel and used for filtering liquid pollutants, aerosol particles and gas pollutants in the condensed airflow; the fan is arranged at the air outlet end of the airflow channel, and the fan is used for guiding airflow to flow in from the air inlet end of the airflow channel and to be discharged from the air outlet end of the airflow channel; wherein the airflow channel is linear. According to the air purifier, the airflow backflow probability can be effectively reduced, the turbulent flow energy generation rate is greatly reduced, and airflow flows more smoothly in the airflow channel, so that airflow around the air purifier smoothly flows into the airflow channel, the smoke escape amount can be effectively reduced, and the oil smoke purification efficiency is improved.

The invention relates to the technical field of gas adsorption composite materials, in particular to zirconium-based MOF composite filter cloth and a preparation method and application thereof. The preparation method comprises the following steps: by taking a polyester non-woven fabric as a flexible carrier, sequentially carrying out alkali liquor activation and epoxy silane surface treatment to construct an active interface layer rich in epoxy groups; synthesizing a difunctional organic ligand simultaneously containing carboxylic acid and thioether functional groups by adopting a one-pot condensation reaction; in-situ self-assembly of zirconium metal clusters and bifunctional ligands is realized through a solvothermal-hot pressing synergistic process, oriented growth of MOF crystals on the surfaces of fibers and covalent interface connection formed through epoxy-carboxyl ring-opening reaction of a silane coupling agent are synchronously completed, and the MOF composite filter cloth is obtained. According to the zirconium-based MOF composite filter cloth disclosed by the invention, the efficient and high-selectivity capture of trace SOs is realized by utilizing the synergistic effect of thioether groups in ligands and unsaturated sites of metal clusters, and the regeneration is realized to a certain extent.

The invention specifically discloses a preparation method of a composite optical filter, an optical filter and image acquisition equipment, and belongs to the technical field of optical element production. The preparation method comprises the following steps: depositing a solid pigment on one end surface of a glass substrate through evaporation treatment, and forming a first pigment film capable of absorbing near-infrared light to obtain a first laminated structure; one end face of the first pigment film back to the glass substrate is a first end face of the first laminated structure, and one end face of the glass substrate back to the first pigment film is a second end face of the first laminated structure; through evaporation treatment, one of a cut-off film and an antireflection film is formed on the first end face, and the other of the cut-off film and the antireflection film is formed on the second end face. According to the invention, the preparation process of the composite optical filter can be simplified, and the production difficulty of the optical filter is reduced, so that the rejection rate of the optical filter is reduced, the production efficiency of the optical filter is improved, and the preparation cost of the optical filter can be reduced.

The utility model provides a zinc air battery filtering device which comprises a shell, an air inlet is formed in the surface of one side of the shell, a fixing frame located outside the air inlet is fixedly connected to the surface of one side of the shell, a rectangular groove is formed in the surface of the inner side of the fixing frame, a connecting frame is inserted into the fixing frame, and a multi-layer composite filtering material is installed in the connecting frame; the multi-layer composite filter material comprises a fiber filter screen, an activated carbon fiber layer and a microporous ceramic membrane, a mounting block is fixedly connected to the top of the connecting frame, guide rods symmetrically distributed relative to the fixing frame are fixedly connected to the surface of one side of the shell, the two guide rods are jointly and slidably sleeved with a U-shaped connecting plate, and a tension spring is fixedly connected between the U-shaped connecting plate and the surface of one side of the shell. Two positioning grooves are formed in the mounting block; through cooperative use of the fiber filter screen, the activated carbon fiber layer and the microporous ceramic membrane, a relatively good filtering effect on impurities in air can be ensured, and the filtered air enters the shell through the air inlet, so that the subsequent use effect of the zinc air battery is ensured.

The invention relates to the technical field of centrifugal cooling fans, in particular to a centrifugal cooling fan capable of intelligently controlling opening and closing of an air outlet and a control method.The centrifugal cooling fan comprises a fan body and is characterized in that the fan body comprises an upper shell, an air inlet is formed in the top of the upper shell, and a wind wheel assembly is arranged in the upper shell; a stator assembly is arranged below the wind wheel assembly, a circuit board assembly is arranged below the stator assembly, a lower shell is arranged below the circuit board assembly, the lower shell is in closed fit with the upper shell and provided with an air outlet, a multi-layer composite filtering assembly is arranged at the air outlet, and a wind shield is arranged in an inner cavity of the lower shell. According to the centrifugal cooling fan capable of intelligently controlling opening and closing of the air outlet, the integration and intelligent design advantages are remarkable, the intelligent control module drives the electromagnetic winding to regulate and control the rotatable wind shield to accurately open and close the air outlet, and cooling as needed, energy conservation and impurity prevention are achieved; the multi-layer composite filtering assembly filters air in a gradient mode.

This invention belongs to the technical field of filtration aids for food-grade enzyme preparation production, specifically relating to a composite filter aid comprising food-grade diatomaceous earth, food-grade expanded perlite, microcrystalline cellulose, food-grade silica powder, food-grade calcium carbonate, food-grade magnesium carbonate, hydroxypropyl methylcellulose, a diatomaceous earth porous framework compound modified with a low-adsorption sodium alginate pectin silica hydration layer for glucose oxidase, a perlite microcrystalline cellulose chitosan tannic acid-bridged gradient pore modification compound, and food-grade silica. Its preparation includes preparation of a basic mixture, preparation of a composite mixture, drying and cooling, and sieving. This invention forms a loose and stable filter cake, reduces filtration resistance, and improves the filtration speed, filtrate clarity, and enzyme activity retention rate of the glucose oxidase production solution.

The invention relates to a composite filter element, which comprises an inner-layer tubular carbon rod for filtering heavy metals in raw water to generate purified water and defining a water outlet pipeline; the outer-layer tubular carbon rod is used for filtering chlorine in the raw water and is spaced from the inner-layer tubular carbon rod; the first end cover is used for limiting one end of the inner-layer tubular carbon rod and one end of the outer-layer tubular carbon rod; the second end cover is separated from the first end cover, limits the other end of the inner-layer tubular carbon rod and the other end of the outer-layer tubular carbon rod, is provided with a water outlet communicated with the water outlet pipeline, and defines a resin particle accommodating space together with the inner-layer tubular carbon rod, the outer-layer tubular carbon rod and the first end cover; and a plurality of resin particles accommodated in the resin particle accommodating space and used for softening the water quality of the raw water. The composite filter element is small in occupied volume, low in cost, simple in filter element replacement and good in user experience.

This invention relates to the field of air purification technology, specifically to an integrated air purification and refrigeration device. A fan draws in air from outside the casing, filtering it through a filter screen before drawing it into a first chamber. This initial filtration of the air within the first chamber is followed by the air passing through a perforation into a composite filter plate. The composite filter plate then performs multiple filtrations on the air. The filtered air then enters an evaporator below the composite filter plate, where the heat carried by the air is absorbed by the refrigerant inside the evaporator, turning the air into cold air. Rotating the first misalignment plate opens the annular plate, allowing the cold air to exit through the annular opening, thus achieving both air purification and refrigeration.

This application discloses a cooling composite filter rod and a heated cigarette. The cooling composite filter rod includes a first forming paper and a filter element wrapped inside the first forming paper. The filter element includes a support section, a filter section, and a hollow section arranged sequentially. The filter element also includes isolation paper. Isolation paper is respectively arranged between the support section and the filter section, and between the filter section and the hollow section. Both ends of the filter section pass through the corresponding isolation paper and are connected to it to allow smoke to pass through. A gap is formed between the filter section and the first forming paper. Multiple first vent holes are formed on the first forming paper at positions corresponding to the filter section. Second vent holes are formed on the isolation paper between the filter section and the hollow section so that airflow passes through the first vent holes and the second vent holes and enters the hollow section, mixing with the smoke flowing out of the filter section. This cooling composite filter rod can significantly reduce the smoke temperature at the inlet end and the surface temperature of the composite filter rod.

This invention discloses a composite filter element and a water purifier. The composite filter element includes a first filtration assembly, which comprises a filter element cover, an upper cover, a filter element, and a limiting member. The upper cover is movably connected to the filter element cover and can move up and down relative to it. The upper cover is fixedly connected to the filter element. The limiting member is provided corresponding to the stepped portion, and there is a space for movement between the limiting member and the stepped portion. The limiting member is located on the lower side of the stepped portion and is used to limit the stepped portion. This invention achieves this by movably connecting the upper cover to the filter element cover and fixing the upper cover to the filter element, allowing the upper cover and the filter element to move relative to the filter element cover. Furthermore, a limiting member is provided to limit the stepped portion on the filter element cover. The space for movement between the stepped portion and the limiting member allows the lower part of the filter element to slide downwards as a whole when subjected to tension, preventing deformation or tearing due to excessive tension.

An apparatus and method are provided for an air filter for heating, ventilation, and air conditioning (HVAC) systems that removes molecular contaminants and volatile organic compounds (VOCs) from building air. The air filter comprises a support frame with a shape and size suitable for proper orientation within the HVAC system. A composite filter medium is housed within the support frame to remove molecular contaminants and VOCs from the air circulating through the HVAC system. A portion of the first layer of the filter medium is pleated and may consist of multiple layers configured to provide relatively high filtration efficiency and low pressure drop across the filter medium. A second portion of the filter medium is bonded to the first and maintains a uniform pleat distribution relative to the first.

1. The name of the design product: filter rod (lotus flower shape). 2. The use of the design product: as a filter rod, or filter core, or a section of composite filter rod core of cigarette or heat-not-burn cigarette, used for smoke filtration after being wrapped with a cigarette. 3. The design points of the design product: the combination of shape and pattern. 4. The picture or photo that best indicates the design points: design 1 perspective view. 5. The rear view, top view and bottom view of each design are the same as the front view, and the rear view, top view and bottom view of each design are omitted. 6. Design 1 is designated as the basic design. 7. Other circumstances that need to be explained: a in design 4 is a transparent film paper.

The utility model relates to the technical field of air purification, and particularly discloses a graphene air purifier filter element which comprises a purification inner barrel, an air supply pipe communicated with the bottom of the purification inner barrel, a porous arc-shaped hollow shell detachably installed on the outer circumferential face of the purification inner barrel, and a graphene composite filter element embedded in the porous arc-shaped hollow shell. A stand column is fixedly arranged at the top end of the purification inner cylinder and inlaid with a circular cover used for limiting the top end position of the porous arc-shaped hollow shell, and a spring and a hoop are sequentially arranged at the top of the stand column from bottom to top. According to the device, the porous arc-shaped hollow shell is installed outside the purification inner cylinder through a buckle structure, the step of replacing the graphene composite filter element is simplified, the bottom of the porous arc-shaped hollow shell is in buckle fit, the top of the porous arc-shaped hollow shell is limited by a circular cover, the installation stability is also guaranteed, the operation of locally replacing the core structure of the filter element is simplified through the structure, and the use experience is optimized.

The application relates to the technical field of ecological environment engineering, and discloses a modular rain flood resource deep purification and underground storage integrated device, which comprises a radial shear purification module, a hydraulic closed locking assembly and a spiral push flow storage module which are coaxially and communicatively arranged from top to bottom; the radial shear purification module comprises a first shell, a composite filter material layer filled in the first shell, an inverted funnel-shaped flow guide cover arranged above the composite filter material layer and a central siphon assembly, a horizontal annular flow channel is formed between the lower edge of the inverted funnel-shaped flow guide cover and the upper surface of the composite filter material layer; the spiral push flow storage module comprises a second shell and a spiral flow guide plate arranged in the second shell. Through cooperation of the inverted funnel-shaped flow guide cover and the central siphon assembly, vertical gravity flow during cleaning is converted into horizontal radial converging flow along the filter material surface, the integrity of a biofilm structure is maintained, and long-term stable operation of the filter layer can be realized without external power.

This utility model relates to the technical field of composite filter rod forming machines, and in particular to an arc-shaped baffle and a gap-eliminating mechanism for a gap-eliminating mechanism. The arc-shaped baffle includes a first arc surface and a second arc surface that are connected to each other. The first arc surface is disposed around the first gap-eliminating wheel, and a guide groove is provided on the first arc surface. The length direction of the guide groove extends along the arc direction of the first arc surface, and the groove wall of the guide groove slides against the first wheel tooth. The second arc surface is disposed around the second gap-eliminating wheel and slides against the filter rod located in the second receiving area. A first opening is provided at the first end of the second arc surface near the first arc surface. The first opening communicates with the guide groove to guide the filter rod into the guide groove. Through the design of the guide groove, this utility model can axially constrain the filter rod, correct it to be in the ideal conveying state, and prevent deviation or misalignment.

The utility model discloses a multi-level filter element which comprises a mounting frame, three filter element inserting opening supports are arranged on one side of the mounting frame, and a composite filter element, an RO (reverse osmosis) membrane filter element and a rear filter element are respectively arranged in the three filter element inserting opening supports in a clamping manner. Through the arrangement of the three filter element inserting opening supports, the three filter elements can be preliminarily limited, then the three filter element fixing covers are turned over clockwise, limiting grooves and elastic clamping pieces on the surfaces of the three filter elements are clamped with the three filter element fixing covers correspondingly, the three filter element fixing covers are firmly fixed to the tops of the three filter elements, and the filter element fixing covers are firmly fixed to the tops of the three filter elements; the three filter elements are further limited and fixed, the structural strength of the filter element insertion openings can be improved through the arrangement of the seven reinforcing pieces and the seven reinforcing blocks, vibration generated when a machine works can be effectively relieved, and then water seepage caused by breakage of the filter element insertion openings can be avoided.

This invention discloses a soil chloride ion detection pretreatment device, its usage method, and a filter paper preparation method, relating to the field of laboratory equipment technology. The device includes a funnel placement rack with a double-compartment funnel inserted inside. Eight evenly distributed structural support ribs are fixedly installed on the inner wall of the double-compartment funnel. Folded composite filter paper and a nylon support mesh are placed sequentially on the structural support ribs. The upper layer of dilute nitric acid is used to wash away chloride from the activated carbon fiber layer, efficiently adsorbing colored substances such as humus and organic matter in the soil extract. This results in a clear and transparent filtrate, eliminating the interference of deep yellow and brown to the brick-red endpoint of the silver nitrate titration method. The endpoint is clearly distinguishable, and the chloride ion recovery rate is stabilized at 92.0%–105.0%. This solves the problem of the lack of a decolorization step in the silver nitrate titration method, leading to a blurred endpoint and a detection error of over 20% caused by high-chroma soil extract.