45results about How to "Not easy to plug holes" patented technology

The invention discloses a rotary gravel vibrating screen for construction. The rotary gravel vibrating screen for construction comprises a base and a screening chamber arranged on the base and further comprises a stirring chamber. A stirring impeller is arranged at the center inside the stirring chamber, the lower end of the stirring chamber is communicated with the screening chamber, two filter screens are parallelly arranged in the screening chamber, mesh holes of the filter screens are downsized from top to bottom, extending ends on one side of the filter screens are connected with compression springs, one side of the outer wall of the screening chamber is connected to a collection box arranged on the base through a collection pipe, a rotary vibrating mechanism is arranged below the screening chamber, and the base is provided with an electric control switch. The rotary gravel vibrating screen has the advantages of high screening quality, high transmission stability, reasonable structural design, convenience in use, high production efficiency, long service life and the like.

The invention discloses an elliptical vibrating screen for an asphalt mixing plant. The elliptical vibrating screen comprises a vibrating screen body, two supporting plates, a motor base cross beam, two vibrating motors, a screen sieve and a tensioning device. A plurality of middle supporting beams are arranged in a side plate of the vibrating screen body from top to bottom. One end of the screen sieve of the vibrating screen is connected to the middle supporting beams, and the other end of the screen sieve of the vibrating screen is connected to the screen sieve tensioning device. The two supporting plates with the size as same as the inner width of the side plate are arranged on the top of the vibrating screen body, and the motor base cross beam of a rectangular beam structure is connected between the two supporting plates. The two vibrating motors are symmetrically fixed to the motor base cross beam and have the same rotation speed and different exciting force. In the operation process of the vibrating screen, the rotation directions of the two vibrating motors are opposite. The elliptical vibrating screen integrates a linear vibrating screen and a round vibrating screen and has the advantages that the processing capacity is high, the equipment height is small, the structure is reasonable, materials are easily layered, holes will not be blocked easily and the screening efficiency is high.

The invention relates to a large-flux enhanced PVDF unlined ultrafiltration membrane. The ultrafiltration membrane is prepared from, by weight, 22-30 parts of dopamine-modified polyvinylidene fluoride, 10-20 parts of a hydrophilic agent, 50-70 parts of a polar solvent, 10-20 parts of a pore forming agent and 5-10 parts of an auxiliary agent; the hydrophilic agent contains triethanolamine. According to the large-flux enhanced PVDF unlined ultrafiltration membrane, by blending and modifying the hydrophilic agent, the auxiliary agent and the dopamine-modified polyvinylidene fluoride in the polarsolvent, the surface tension of the surface of the membrane and the inner walls of membrane pores is reduced, and the hydrophilicity of the polyvinylidene fluoride is improved; the triethanolamine inthe hydrophilic agent has hydrogen-bond interaction with polar bonds in the auxiliary agent and polar bonds in a dopamine composite layer, the hydrophilicity can be maintained for a long time accordingly, the antifouling property of the membrane is improved, and the high operating flux is kept for a long time; the small-molecule pore forming agent does not easily block the pores, the membrane forming performance is good, the pure water flux is good, the degree of entanglement with a main material is low, and the pore forming agent is easily detached from the surface of the membrane; the auxiliary agent effectively improves the melt processability, and the mechanical properties are greatly improved.

The invention relates to recycled brick aggregate permeable concrete and a preparation method thereof. The recycled brick aggregate permeable concrete comprises the following components in parts by mass: 1150-1184 parts of a recycled brick aggregate, 201.3-276.3 parts of cement, 71.9-98.7 parts of lithium slag powder, 14.4-19.7 parts of silica fume, 72-98.7 parts of water, 0.06-0.08 part of hydroxypropyl methylcellulose and 0.92-1.26 parts of a polycarboxylate superplasticizer. The preparation method is as follows: 1) weighing the cement, the silica fume and the lithium slag powder according to proportion and mixed evenly; 2) weighing the recycled brick aggregate in proportion, adding the mixture obtained in the step 1), and stirring and mixing uniformly; (3) weighing the water, the hydroxypropyl methylcellulose and the polycarboxylate superplasticizer in proportion and adding into the mixture obtained in the step (2), and stirring and mixing evenly to obtain the recycled brick aggregate permeable concrete. The recycled brick aggregate permeable concrete has good adhesiveness, low dead weight, high water absorption, good water retention, good water purification effect, capability of adsorbing heavy metal ions and low cost, and can be widely applied to places such as river banks, slope protection, road base pavement and the like.

The invention provides an EGCG preparation method, particularly relates to a preparation method for industrial production of high-purity EGCG and belongs to the field of separation and purification of plant monomers. For solving the problem that at present, a process for preparing the EGCG based on an organic solvent extraction method is complicated, adopts a large number of organic solvents in the production process and is not safe and environment-friendly enough, the EGCG preparation method comprises the following steps of green tea smashing, vacuum high-temperature extraction with deionized water, inorganic ceramic membrane filtration, enrichment with macroporous adsorption resin, reversed phase chromatography, vacuum concentration and freeze-drying. The method only adopts water, aqueous ethanol and other solvents in the whole preparation process of the process, the usage and recovery amount of a large amount of organic solvents is decreased, the non-toxic, safe and simple process is achieved, ceramic membrane, resin and reverse chromatographic column filler are recyclable, the cost is greatly reduced, meanwhile the purity of the EGCG is improved, and the process is more suitable for large-scale EGCG production.

The invention discloses a preparation method of a polyacrylonitrile fiber. Polyacrylonitrile is firstly swelled and dissolved in an ionic liquid and a high-boiling-point (150-190 DEG C) solvent in a certain proportion under the conditions of high temperature and high pressure, then a volatile or low-boiling-point (30-60 DEG C) solvent is added to obtain a homogeneous spinning solution, then spinning and traction splitting are carried out to prepare the polyacrylonitrile fiber, and the polyacrylonitrile fiber has the advantages that the solvent is not prone to being wrapped in the fiber, and the fiber defect is improved; and the prepared fiber has the technical effects of denser density and thinner diameter.

The invention discloses white aqueous jet ink. The formula of the ink comprises the following components in parts by weight: 10-50 parts of hollow polymer microsphere emulsion serving as a white pigment, 5-30 parts of filming emulsion and 10-70 parts of de-ionized water, wherein the hollow polymer microsphere emulsion contains one or more of hollow micro-spherical copolymer particles with acrylic acid-styrene, styrene-polyurethane or acrylic acid-polyurethane as shells; and the de-ionized water is filled in cavities of the microspheres. The white jet pink provided by the invention has the advantages of no precipitation, low probability of pore blockage, high whiteness, high covering power, good adhesion, stable performance, environmental friendliness, no pungent odor and suitability for being applied to inkjet printers, flat plate printers and ink jet printers.

The invention provides a precise metal mask and an etching laser composite manufacturing method thereof. The precise metal mask is characterized in that one side surface of a metal substrate is a first main surface, the other side surface of the metal substrate is a second main surface, the metal substrate is provided with a plurality of exposed holes, the exposed holes are provided with etching holes in the first main surface, the exposed holes are provided with laser holes in the second main surface, the etching holes and the laser holes of which the centers coincide communicate with each other, outer openings of the etching holes are large, inner openings of the etching holes are small, the outer openings and the inner openings are in transition connection through a concave arc hole wall, an inclined included angle of a connecting line of the outer openings and the inner openings is an evaporation angle, the laser holes are provided with vertical hole walls, and the laser holes have high-precision hole diameters. The manufacturing method comprises the following steps: completely coating a solid photoresist layer on the first main surface and the second main surface of the metal substrate; performing a single-side exposure and development process on the first main surface to manufacture a first hollowed-out area; performing a single-side etching process on the first hollowed-out area to etch a recessed area; and performing a laser process in the recessed area to bombard and engrave a through hole.

The invention belongs to the technical field of rammers for foundation treatment in constructional engineering, and particularly relates to a special rammer for dynamic compaction replacement treatment of flow plastic-soft plastic clay. The special rammer comprises a hook device part, an anti-burying hammer lengthening body part and a rammer body part, wherein the height of the anti-burying hammerlengthening body part is 2.8 m or above; the rammer body part comprises an upper trapezoidal circular truncated cone structure and a lower cylindrical structure; and a plurality of semicircular ventholes are uniformly distributed in the outer wall of the rammer body part. According to the special rammer, the problem of hammer burying in the dynamic compaction replacement of the flow plastic-softplastic clay foundation is solved, the rammer can be used for solving the problem that dynamic compaction deep replacement cannot be carried out due to hammer burying in the dynamic compaction replacement treatment of the flow plastic-soft plastic clay, the application range of the dynamic compaction which is an environment-friendly and low-cost treatment technology can be further expanded, and the application market and the development prospect are wide.

The invention discloses a polyurethane sieve mesh with advantages of noise reducing, high-temperature resistance and corrosion resistance, wherein the polyurethane sieve mesh comprises thermoplastic polyurethane, a vinyl ester resin, melamine, carboxyl-terminated liquid nitrile butadiene rubber, chlorinated polyethylene, a titanate coupling agent, and a filler. According to the present invention,through the material blending modification, the sieve mesh has advantages of excellent mechanical property, high tensile strength, excellent tear resistance, good elasticity, good resilience, good uniformity and good stability, can maintain the stable performance after multiple use, cannot be clogged, further has advantages of good heat resistance, corrosion resistance, excellent aging resistance,good bearing capacity, good corrosion resistance, good impact resistance, good shock absorption performance, wear resistance and aging resistance, and can be used in ore screening, chemical industryfiltration, and other application fields.

The invention discloses a drainage treatment method and a drainage treatment device, which relate to the technical field of drainage treatment; in order to improve the treatment efficiency and effect; The interior is provided with a first cavity and a second cavity, the same filter plate is set between the first cavity and the second cavity, a filter mechanism is provided on the outer wall of one side of the filter plate, and the outer wall of one side of the filter plate is provided with a A through hole adapted to the filter mechanism; the method includes the following steps: installing the input end of the main body on the output end of the water supply device, and connecting the output end of the main body to the drain. The present invention can collect impurities well by setting filter plate, filter sleeve and other structures, and clean them conveniently through the zipper. In addition, the filter holes are evenly opened on the outer wall of the filter sleeve, and cooperate with the pocket structure of the filter sleeve to make the filter The sleeve is not easy to block the hole before the inner space is collected.

The invention belongs to the technical field of a rammer for foundation treatment in construction engineering, and specifically relates to a special rammer for dynamic compaction replacement treatment of flow-plastic to soft-plastic clay, including a hook part, an anti-buried hammer extension part and a rammer For the hammer body, the height of the anti-buried hammer extension is more than 2.8 meters. The rammer body includes an upper trapezoidal circular table structure and a lower cylindrical structure. The outer wall of the rammer body is evenly distributed with a number of semicircular ventilation holes. The present invention solves the problem of "buried hammer" in the dynamic compaction replacement of flow-plastic to soft-plastic clay foundations. For the problem that it is impossible to carry out dynamic compaction depth replacement due to hammering, dynamic compaction, an environmentally friendly and low-cost treatment technology, can further expand the scope of application, and has a broad application market and good development prospects.

The invention discloses a thermoplastic polyurethane fine mesh screen. The thermoplastic polyurethane fine mesh screen comprises a screen body, a plurality of small screen pieces, rectangular rib strips, triangular rib strips, transverse screen borders and longitudinal screen borders. The small screen pieces are arranged in parallel to form the screen body. The screen body is fixedly arranged in a screen frame defined by the transverse screen borders and the longitudinal screen borders. Each rectangular rib strip is connected between every two adjacent small screen pieces. The thickness of the rectangular rib strips is equal to that of the small screen pieces. The small screen pieces are composed of rectangular net areas, big transverse rib strips, big longitudinal rib strips and small longitudinal rib strips. The big transverse rib strips and the big longitudinal rib strips or the small longitudinal rib strips are intersected to form the rectangular net areas on the small screen pieces. The thermoplastic polyurethane fine mesh screen has the characteristics that the thermoplastic polyurethane fine mesh screen is high in porosity, long in service life, not prone to hole blockage, low in investment, simple in forming process, short in forming time, high in forming efficiency and high in finished product rate, and the phenomenon that holes of the screen are not through cannot occur.

The invention provides a graphite filter plate. The graphite filter plate comprises a filter plate body and filtering holes which are evenly arrayed in the filter plate body. The filter plate body comprises an upper layer filter cloth, a middle layer graphite filter plate and a lower layer filter cloth. The upper layer filter cloth and the lower layer filter cloth are fixed on the middle layer graphite filter plate through a fixing ring which is arranged around the middle layer graphite filter plate. The graphite filter plate has the advantages of being high-temperature resistant, corrosion resistant, accurate in fineness, not prone to blocking the holes, capable of avoiding loading of a filter screen, simple in structure, long in service life, and capable of lowering the production cost of enterprises and effectively improving the production efficiency.

The invention relates to a high-flux reinforced ultrafiltration membrane, which is composed of the following components in parts by weight: 30-40 parts of dopamine-modified polyvinyl chloride; 10-20 parts of a hydrophilic agent; and 40-50 parts of a polar solvent ; 10-20 parts of porogen; 5-15 parts of auxiliary agent. The present invention adopts hydrophilic agent, auxiliary agent and dopamine-modified polyvinyl chloride to be blended and modified in polar solvent, so as to reduce the surface tension of the membrane surface and the inner wall of the membrane hole, and improve the hydrophilicity of polyvinyl chloride. The polar bonds in the triethanolamine and the auxiliary and the polar bonds in the dopamine composite layer produce hydrogen bonds and attract each other, so that the hydrophilicity can be maintained for a long time, the anti-fouling property of the ultrafiltration membrane can be improved, and the UF membrane can be maintained for a long time. High operating flux; in addition, the small molecule porogen is not easy to block pores, has good film-forming performance, good pure water flux, low degree of entanglement with the main material, and is easy to detach from the surface of the film; the auxiliary agent can effectively improve the melt processability , the mechanical properties are greatly enhanced.

The invention relates to an eddy flow grading column and method for using an eddy flow grading column in pulp crude / fine grain grading. The eddy flow grading column comprises a frame, a pedestal is fixed at the frame, a horizontal support strip is fixed at the pedestal, a fine grain outlet pipeline is connected below the pedestal, a large valve is arranged at the fine grain outlet pipeline, a tubular cylinder is arranged at the pedestal, a cylindrical screen mesh having a coaxial line is distributed in the tubular cylinder, the cylindrical screen mesh is fixedly at a rack, the bottom of the rack is fixed at the support strip, a coarse grain outlet pipeline is connected below a middle part of the support strip, a small valve is arranged at the coarse grain outlet pipeline, an upper cover isarranged at the top of the tubular cylinder, an ore-feeding pipe and a water inlet pipe are arranged at the upper cover, a through hole is arranged at the center of the upper cover, a rotating shaftis arranged at the coaxial line of the cylindrical screen mesh, a blade spindle sleeve is arranged at the bottom of the rotating shaft, a blade is arranged at the blade spindle sleeve, the rotating shaft is driven by a motor, and the motor is arranged at the frame. The eddy flow grading column has the advantages of good grading precision and high grading efficiency.

The invention discloses a method and a system for concentrating a large graphene oxide solution. The large graphene oxide solution flows through a limited space, and is rapidly sheared in order to coagulate graphene oxide. The coagulated graphene oxide is 60 to 100mg / mL in final concentration after being filtered and collected. The coagulated graphene oxide is unfolded slowly under slow cutting, recovers to a uniform structure, and is dispersed in the solution. The method can be applied to rapid continuous concentration of the graphene oxide solution.

The invention relates to a large-flux reinforced hollow fiber membrane, wherein the separation membrane layer is composed of the following components in parts by weight: 22-30 parts of polyvinylidene fluoride, 10-20 parts of hydrophilic agent, 50-50 parts of polar solvent 60 parts, 10-20 parts of porogen, 5-10 parts of auxiliary agent, and the hydrophilic agent contains triethanolamine. The present invention adopts hydrophilic agent, auxiliary agent and polyvinylidene fluoride to blend and modify under polar solvent to reduce the surface tension of the membrane surface and the inner wall of the membrane hole, improve the hydrophilicity of polyvinylidene fluoride, and the hydrophilic agent The triethanolamine can generate hydrogen bonds with the polar bonds in the additives, so that it can maintain the hydrophilicity for a long time, improve the anti-fouling performance of the hollow fiber membrane, and maintain a high operating flux for a long time. The triethanolamine can also be adsorbed on the surface of the hollow fiber material by the hydrogen bond force, thereby enhancing the adhesion strength between the separation membrane layer and the hollow fiber, and adding the hollow fiber as a support can prevent the membrane material from breaking.

The invention discloses white aqueous jet ink. The formula of the ink comprises the following components in parts by weight: 10-50 parts of hollow polymer microsphere emulsion serving as a white pigment, 5-30 parts of filming emulsion and 10-70 parts of de-ionized water, wherein the hollow polymer microsphere emulsion contains one or more of hollow micro-spherical copolymer particles with acrylic acid-styrene, styrene-polyurethane or acrylic acid-polyurethane as shells; and the de-ionized water is filled in cavities of the microspheres. The white jet pink provided by the invention has the advantages of no precipitation, low probability of pore blockage, high whiteness, high covering power, good adhesion, stable performance, environmental friendliness, no pungent odor and suitability for being applied to inkjet printers, flat plate printers and ink jet printers.