37results about How to "Guaranteed performance and stability" patented technology

This invention discloses a method for preparing high-purity oxygen-free copper, relating to the field of metallurgical technology. The method includes multi-stage electrolytic refining, gradient-heating vacuum melting, inert gas-protected refining, electron beam melting, hydrogen plasma arc melting, directional solidification, and post-treatment steps. The multi-stage electrolytic refining utilizes a specific component electrolyte and periodically commutated current; vacuum melting is combined with bidirectional electromagnetic stirring; inert gas-protected refining is combined with a gradient reduction composite covering agent; electron beam and hydrogen plasma arc melting achieve deep purification and deoxidation; and directional solidification and two-stage annealing ensure product performance. The high-purity oxygen-free copper prepared by this invention has a conductivity of 102.3% IACS, a copper content ≥99.9999%, and an oxygen content <1.0 ppm. It exhibits high purity, low oxygen content, and excellent conductivity. The process is stable and controllable, making it suitable for high-end electronics applications.

This utility model relates to a highly practical electric water bottle, comprising a body, a control system disposed within the body, and a water level gauge assembly. The body contains a water bottle with an inner cavity, and a flow guide pipe communicating with the inner cavity of the water bottle is located below the water bottle. The control system includes a control panel disposed on the outer surface of the body, and the control panel has a liquid level display area. The water level gauge assembly includes a liquid level detection tube vertically disposed on the outside of the water bottle and communicating with the inner cavity of the water bottle, and a liquid level sensor disposed on the liquid level detection tube and electrically connected to the control system. By incorporating the water level gauge assembly within the body, the water level inside the water bottle can be detected and displayed intuitively through the control panel for easy user viewing. This avoids the aesthetically unappealing problem caused by transparent visible areas on the body of traditional electric water bottles, effectively improving the user experience.

The utility model relates to the technical field of scooters, and discloses a scooter and a scooter frame, the scooter comprises the scooter frame, the left side of the scooter frame is fixedly connected with a girder, the inner wall of the girder is rotatably connected with a scooter rod base, the top of the scooter rod base is fixedly connected with a threaded rod, and the outer wall of the threaded rod is rotatably connected with a scooter rod head. A lock sleeve is arranged on the outer wall of the vehicle rod head, a screw is in threaded connection with the inner wall of the lock sleeve, a rotating shaft is rotationally connected to the front end of the screw, a rotating handle is fixedly connected to the outer wall of the rotating shaft, and a cushioning mechanism is fixedly connected to the right side of the vehicle frame. According to the utility model, the design of the frame enables the space of the mounting cavity to be enlarged, the capacity of the electricity storage piece to be improved, the control unit is placed in the heat dissipation cavities on the two sides of the mounting cavity, the guide plates can guide external airflow to enter the heat dissipation cavities, and heat generated when the control unit works can be taken away in time; therefore, the performance stability of the whole product in long-time operation is ensured.

The invention relates to the technical field of electrochromic materials and glass preparation, in particular to a preparation method of sandwich type all-solid-state inorganic electrochromic glass which is formed by sequentially compounding a tempered glass layer, a film layer and an electrochromic film layer pile. The thickness of the tempered glass layer is 4 mm, and the film layer is a PVB film and is 0.76 mm thick. The electrochromic film layer stack takes sodium-calcium non-tempered glass with the thickness of 3mm as a substrate, and an anti-ion diffusion layer, a first conductive layer, a first resistive layer, a negative electrode color changing layer, a second resistive layer, a positive electrode color changing layer, a third resistive layer, a second conductive layer and an outermost protective layer are sequentially arranged on the surface of the substrate from inside to outside; the anti-ion diffusion layer is a silicon dioxide layer, and the thickness is 200 nm. According to the preparation method of the sandwich type all-solid-state inorganic electrochromic glass provided by the invention, through precise design of each film layer structure of the glass and gradient optimization of a preparation process, the comprehensive performance of a product is synergistically improved, and many problems in the prior art are effectively solved.

The present application relates to the technical field of battery cooling, and discloses an adaptive dual-mode immersed liquid cooling system based on acoustic-heat flow collaborative sensing. The system comprises an acoustic sensor, a temperature sensor, a fuzzy controller, a multi-channel controller, a pump, a cooling coil, a radiator and a water tank. The system can perform single phase change cooling operation in a low rate mode and flow phase change collaborative cooling operation in a high rate mode, and mode switching decisions are made based on frequency domain changes of acoustic characteristics and calculated values of heat flow density. The acoustic sensor collects boiling acoustic wave signals of the cooling liquid, the temperature sensor monitors the battery temperature gradient, the fuzzy controller generates control instructions based on the above signals, and the multi-channel controller controls the pump power, the cooling coil flow and the radiator power. Through collaborative sensing and dual-mode adaptive adjustment, the system improves the cooling efficiency and response speed, adapts to different battery load states, and ensures the safe and stable operation of the battery.

The invention provides a data processing method and device, electronic equipment and a storage medium. The method comprises the following steps: initializing a first semaphore and a second semaphore; calling a calculation thread to calculate the ith data block to obtain an ith calculation result; updating the value of the first semaphore to i; calling the first communication thread to load the (i + 1) th data block in the process of calling the calculation thread to calculate the ith data block, and acquiring (i-1) th network data; under the condition that the first communication thread obtains the (i-1) th network data, the second semaphore is updated to be i-1; when the first semaphore is greater than or equal to i and the second semaphore is greater than or equal to i-1, accumulating the ith calculation result and the (i-1) th network data to obtain ith accumulated data; and sending the ith accumulated data to the next computing node. According to the invention, the data calculation performance can be improved and the communication delay can be reduced.

This invention relates to the field of photovoltaic cable manufacturing technology, and more particularly to a solar photovoltaic cable and its manufacturing process. The process includes: processing a tin-plated cable core according to a pre-process; extruding the tin-plated cable core through an extruder with preset extrusion parameters to perform a first functional layer extrusion; pre-cooling the extruded cable; determining a second preset pulling speed for the second functional layer extrusion process based on a first excess value when the functionality is deemed unqualified, and further determining a second preset pulling speed based on a first excess value when the functionality is deemed unqualified after the pre-cooling stage; and adjusting the cooling temperature based on a second excess value when the cooling is deemed unqualified, and based on a second excess value when the cooling is deemed unqualified, after the cooling is deemed unqualified. This invention can comprehensively assess the manufacturing quality of photovoltaic cables from multiple dimensions and deeply refine it from a single dimension, and automatically feed back and adjust the parameters for manufacturing photovoltaic cables to improve the stability of the performance and the stability of the manufacturing process of photovoltaic cables.

The invention relates to the field of special films, in particular to a polypropylene-based ultrathin special film and a preparation method thereof. The film is prepared from the following components in parts by weight: 80 to 90 parts of isotactic polypropylene resin, 10 to 20 parts of syndiotactic polypropylene resin, 5 to 10 parts of a composite modifier, 5 to 10 parts of a compatilizer, 3 to 8 parts of amino modified nano silicon dioxide, 0.1 to 0.5 part of an antioxidant, 0.3 to 0.7 part of a lubricant, 0.1 to 0.3 part of an anti-hydrolysis agent, 0.1 to 0.3 part of a nucleating agent and 0.05 to 0.3 part of a light stabilizer. The special film prepared by the preparation method disclosed by the invention can still keep excellent mechanical bearing capacity under the ultrathin specification with the thickness of less than or equal to 20 microns, and the mechanical property, the flame retardant property, the weather resistance, the processability and the interfacial compatibility are synergistically improved.

The invention discloses double-layer density gradient nanocellulose / chemical fiber composite frozen gel as well as a preparation method and application thereof, and belongs to the technical field of air filtering materials. According to the composite frozen gel, a chemical fiber non-woven fabric is used as a framework, and a stable three-dimensional porous network structure with density and pore diameter gradient distribution in the filtering direction is constructed by sequentially pouring nano cellulose (CNF) hydrogel with different solid contents and combining a stepped pre-freezing and co-drying process. Wherein the upper layer adopts CNF hydrogel with relatively high solid content to form a compact surface filtering layer; and the lower layer adopts CNF hydrogel with lower solid content to form an ultra-porous deep filtering support layer. Through the innovative gradient structure design, the key technical bottlenecks that the efficiency and resistance of a traditional single-layer homogeneous filtering material are difficult to consider, the long-acting filtering performance is insufficient, the dust holding capacity is low and the like are solved, and the comprehensive unification of ultrahigh filtering efficiency (gt, 99.99%), low airflow resistance, high mechanical strength, excellent thermal stability and outstanding long-acting filtering performance is realized.

The utility model relates to a kind of mixing devices, provide such a kind of cable insulation layer raw material's multi-component stirring device, including shell, control panel, mounting seat and temporary storage cylinder etc.;Control panel is equipped on the upper front side of shell, mounting seat is evenly equipped in the left and right sides of shell, cavity is equipped in the inside of shell, not less than two feed ports are equipped in the upper portion of shell, temporary storage cylinder is equipped in the feed port. The utility model is equipped with multiple temporary storage cylinders and weighing bin, can orderly temporary storage and accurate measurement to each component material before mixing, effectively reduce the processing error caused by raw material loss or artificial intervention due to the need for transfer between proportioning and mixing equipment, improve the uniformity and production efficiency of multi-component raw material stirring, it is favorable to guarantee the performance stability of subsequent cable insulation layer.

The invention discloses a multi-layer aluminum core copper-clad plate adopting a plasma oxidation-copper plating process and also discloses a preparation method of the copper-clad plate, and the preparation method comprises the following steps: carrying out plasma anodic oxidation and copper plating treatment on the surface of an aluminum substrate to obtain a copper-clad plasma anodic aluminum oxide substrate; manufacturing an inner-layer circuit pattern on the surface of the copper-clad plasma anodic aluminum oxide substrate, then overlapping the inner-layer circuit pattern with a copper foil and a prepreg, and carrying out vacuum hot-pressing curing to obtain a multi-layer plate blank embedded with an aluminum core; through holes are formed in the multi-layer plate blank, activation and copper plating treatment are carried out, and interlayer electrical interconnection is achieved; and manufacturing an outer-layer circuit pattern on the surface of the multi-layer plate blank, preparing a solder mask layer on the surface of the circuit, and carrying out nickel plating and gold leaching surface treatment to obtain the multi-layer aluminum core copper-clad plate. According to the method, the problems of weak interlayer binding force, low heat dissipation efficiency, insufficient electrical interconnection reliability and the like of the aluminum core multilayer board are solved, and the prepared copper-clad plate can meet the use requirements of high-frequency and high-power electronic equipment.

The application discloses a kind of based on acidification-thermal activation's red mud base salt excitation cementitious material and its preparation method and application, belong to solid waste base cementitious material technical field.The red mud base salt excitation cementitious material provided by the application includes 98~99% red mud-solid waste gypsum complex, 0.2~0.5% water reducing agent and 0.5~1.8% early strength agent by mass fraction;Red mud-solid waste gypsum complex is prepared by thermal activation of acidified red mud and solid waste gypsum with mass ratio of (8~10):1, and the acidified red mud is obtained by neutralizing composite dealkalizer and Bayer red mud;Composite dealkalizer includes 60~70% carboxylic acid component and 30~40% sulfonic acid component.The utilization rate of Bayer red mud is as high as 85% or more, solving the problem of low utilization rate of Bayer red mud in the prior art;At the same time, the obtained cementitious material has good early strength and late strength, and the performance is equivalent to or even better than the existing cement mortar.

The invention belongs to the technical field of graphene, and particularly relates to a graphene oxide and resistance wire compounded flexible heating pad. The resistance wire is used as a main heating body to provide a basic heat source, and meanwhile, an efficient three-dimensional heat conduction network is constructed through the graphene modified layer. The network not only can quickly and uniformly disperse heat generated by the resistance wire, but also can convert part of heat energy into far infrared radiation with the wavelength of 6-14 microns. By means of the composite heat transfer mode, the overall electric-heat conversion efficiency is greatly improved, reaches 95% or above and is far better than that of a traditional resistance wire heating pad (60-70%), and electric energy is effectively saved.

The invention discloses a rolling method for improving the hardness of a steel rail with standard strength. The production process comprises the following steps: molten iron in a steelmaking process, converter smelting, LF (ladle furnace) refining, VD (vacuum degassing) and continuous casting to ensure the purity and component uniformity of molten steel; rolling and subsequent processes: heating by a stepping furnace, descaling by high-pressure water, rolling by a universal rolling mill, cooling and pre-bending by a cooling bed, straightening, carrying out ultrasonic flaw detection, processing, checking and warehousing; the steel rail comprises the following chemical components in percentage by mass: 0.81-0.86% of C; s : 0.52%-0.59%; mn: 1.17 to 1.25%; less than or equal to 0.020% of P; less than or equal to 0.020% of S; 0.23 to 0.28% of Cr; 0.03 to 0.05 percent of N ; and the balance Fe and impurities. The low-cost and high-quality high-speed steel rail steel is prepared by optimizing the chemical components of the steel grade and customizing the controlled rolling and controlled cooling process, and the hardness, strength and toughness of the high-speed steel rail steel all meet the American standard requirements.

This invention proposes a fully biodegradable mulch film suitable for extreme high-altitude environments and its preparation method, comprising at least one three-layer composite film consisting of an outer layer, a middle layer, and an inner layer; the outer layer is an ultraviolet protective layer, the middle layer is a water vapor barrier layer, and the inner layer is a heat-insulating and protective layer. The mulch film of this invention is a fully biodegradable multilayer co-extruded agricultural mulch film integrating "super weather resistance, high barrier moisture retention, intelligent thermal management, and prevention of additive migration," thereby overcoming the shortcomings of existing mulch films in applications in extreme high-altitude environments.

The invention discloses a high-modulus high-adhesion metal-clad plate which comprises a metal layer, and a first polyimide layer and a second polyimide layer are sequentially stacked on one surface of the metal layer; a first coating liquid of the first polyimide layer comprises a diamine monomer containing a benzimidazole unit, a diamine monomer containing a sulfuryl unit, an active end-capping reagent and a flexible dianhydride monomer; a second coating liquid of the second polyimide layer comprises a diamine monomer of a benzimidazole-benzoxazole unit and a rigid dianhydride monomer which is equal to the diamine monomer in mole. Through compounding of the first polyimide layer and the second polyimide layer, the toughness and the mechanical strength of the composite polyimide film and the adhesive force with a metal plate are flexibly adjusted.

The invention provides a preparation method of curved-surface electrochromic glass. The preparation method comprises the following steps: depositing an electrochromic functional layer on a glass substrate, depositing a buffer layer on at least one side of the electrochromic functional layer to obtain coated glass, and carrying out cold roll forming on the coated glass to obtain the curved-surface electrochromic glass. The preparation method disclosed by the invention adopts a process of first coating and then cold roll forming, so that the thickness and performance uniformity of the functional layer during coating can be guaranteed, the problems of large thickness deviation during coating of the curved glass and difficulty in adaptation of curvature, size and equipment are solved, the performance stability of the device is guaranteed, secondary processing such as cutting and punching is easy to realize, and the production cost is reduced. And the flexibility of product design can be improved.

The invention discloses a high-transparency and high-barrier paper-based packaging material based on in-situ layered construction and a preparation method of the high-transparency and high-barrier paper-based packaging material, and belongs to the technical field of pulping, papermaking and paper-based functional materials. The method mainly comprises the following steps: 1, preparing carboxymethyl fibers; 2, preparing the TEMPO oxidized nano cellulose; 3, preparing raw paper of the high-transparency fiber supporting layer; 4, preparing a hydrogel precursor solution; 5, preparing a mixed coagulating bath; and 6, preparing the high-transparency and high-barrier paper-based packaging material. The invention provides a technical concept of'in-situ layered construction ', a high-transparency and high-strength fiber supporting layer is constructed through plant fibers, CM-fibers and TEMPO oxidized nanofibers, and the high-transparency and high-strength fiber supporting layer is prepared by utilizing the principles of ionic crosslinking and solvent exchange. A hydrogel optical interface layer for filling matrix pores and a compact surface barrier functional film layer are synchronously constructed on the surface of the fiber supporting layer, and finally the high-transparency and high-barrier paper-based packaging material constructed based on in-situ layering is prepared.

This invention discloses a data hierarchical storage intelligent governance method and system driven by hotspot prediction, comprising the following steps: data acquisition, feature engineering, hotspot score calculation, hierarchical judgment, hierarchical storage execution, feedback optimization, and oscillation suppression. This invention abandons the passive, static threshold migration strategy and utilizes a lightweight artificial intelligence prediction model integrating time-series analysis and multi-dimensional features to proactively perceive the dynamic evolution trend of data hotspots, achieving an upgrade from "reactive" to "foresight" governance. By introducing a composite hotspot score calculation formula with a decay factor and combining it with dynamically adjustable three-level judgment thresholds, the accuracy and adaptability of data hierarchical decision-making are significantly improved, avoiding oscillation migration caused by hotspot fluctuations and ensuring system performance stability.

The application provides a data processing method and device, electronic equipment and storage medium; the method comprises the following steps: initializing a first semaphore and a second semaphore; calling a computing thread to perform computing processing on an i-th data block to obtain an i-th computing result; updating the value of the first semaphore to i; in the process of calling the computing thread to perform computing processing on the i-th data block, calling a first communication thread to load an i+1-th data block and obtain i-1-th network data; updating the second semaphore to i-1 when the first communication thread finishes obtaining the i-1-th network data; in the case that the first semaphore is greater than or equal to i and the second semaphore is greater than or equal to i-1, accumulating the i-th computing result and the i-1-th network data to obtain i-th accumulated data; and sending the i-th accumulated data to a next computing node. Through the application, the data computing performance can be improved and the communication delay can be reduced.

The invention relates to the technical field of air compressor equipment, and discloses a water-cooling track air source system which comprises an air compressor, a radiator, a liquid storage tank and a water pump. An air compressor water channel for cooling liquid to flow is formed in the air compressor, and the radiator, the liquid storage tank and the water pump are sequentially connected with the air compressor water channel through pipelines to form an independent cooling liquid circulation loop. When the system operates, the motor drives the air compressor to compress air, and meanwhile the water pump drives cooling liquid to circulate in the loop. The low-temperature cooling liquid enters the air compressor water channel to absorb heat generated by the compression disc and then becomes high-temperature cooling liquid, the high-temperature cooling liquid flows out and then enters the radiator to be cooled, and the cooled cooling liquid enters the liquid storage tank to be stored and then is sent back to the air compressor through the water pump. The air compressor compression disc is subjected to forced circulation cooling through the cooling liquid, the problem that an existing air cooling mode is low in heat dissipation efficiency is solved, the working temperature of the compression disc is effectively reduced, the failure rate of the air compressor is reduced, and the service life of the air compressor is prolonged.

The invention belongs to the technical field of Internet of Vehicles federated learning, and particularly relates to an alliance-based Internet of Vehicles federated learning method, system and device. The method comprises the following steps: firstly, converting convergence local model parameters uploaded by each vehicle into proportion vectors representing local data category distribution by using a small-scale balance auxiliary data set at a base station side; the distribution similarity among the vehicles is measured based on the divergence, the vehicles with similar distribution are clustered to form a plurality of alliances in a self-adaptive manner through a preset divergence threshold, and the number of the alliances does not need to be preset; and finally, vehicles in each alliance cooperatively train an exclusive alliance model. According to the method, the problem of model generalization under data isomerism is effectively solved, the prediction precision and convergence speed of each vehicle end model are remarkably improved while the privacy of the original data is guaranteed, and the method is suitable for an Internet of Vehicles environment.

The invention belongs to the technical field of concrete, and particularly relates to a mud-resistant polycarboxylate superplasticizer and a preparation method thereof. The mud-resistant polycarboxylate superplasticizer is prepared from a zwitterionic monomer, an unsaturated functional monomer containing a primary amine group, an unsaturated polyether macromonomer, an unsaturated acid monomer, formaldehyde, pyrogallic phenol, a chain transfer agent, an initiator, a reducing agent and deionized water. Wherein the zwitterionic monomer is carboxyl betaine methacrylate, and the unsaturated functional monomer containing the primary amine group is 2-aminoethyl methacrylate hydrochloride. The product has the characteristics that the silt content is gt; and in a severe aggregate environment with the content of 5%, extremely high effective adsorption capacity can be maintained only by low mixing amount, and the sensitivity of the concrete to the silt content of sand and gravel is remarkably reduced.

The invention discloses a pantograph test device for an electrified road vehicle, and the device comprises a test bearing platform, a portal frame, a simulation truck head bearing body, a pantograph, a cable, a supporting plate, an infrared thermal imager, a lifting mechanism, a contact resistance test probe, a mechanical arm, and a pollution mixed injection unit. The simulated truck head bearing body is placed on the test bearing platform, the pantograph is in contact with a cable above the pantograph through a sliding plate, the supporting plate is installed on a portal frame cross beam, the thermal infrared imager is used for monitoring a pantograph sliding plate surface temperature field, the lifting mechanism is arranged on the supporting plate, and the contact type resistance test probe below the lifting plate is used for detecting pantograph resistance. The mechanical arm is connected with the pollution mixing and spraying unit, severe environments such as rain and snow can be accurately simulated, aerosol is sprayed to simulate the mixing state of natural rainfall and pollutants, the testing environment is close to the actual working condition, and the practicability and reliability of the testing result are remarkably improved.

The utility model discloses a bridge construction grouting equipment, including base, the base top respectively fixed connection multiple support column one end, multiple support column other end respectively fixed connection agitator barrel bottom end all around, the agitator barrel top fixed mounting support frame, support frame center fixed mounting has screw rod one side end, screw rod other side thread sleeve ball screw nut, ball screw nut bottom fixed connection pivot, pivot fixed mounting has multiple stirring vane, stirring vane is set in the agitator barrel, ball screw nut rotation sleeve connecting shaft, the both ends of connecting shaft respectively fixed connection sliding column, sliding column is slidably connected with sliding slot respectively, the sliding slot is set respectively in the both sides of agitator barrel, and one of sliding column fixed mounting has annular support, and the opposite side in annular support respectively fixed mounting has rack.

The invention relates to the technical field of epoxy resin, in particular to a degradable epoxy resin composition, a degradable epoxy resin material and a preparation method, a degradation method and application of the degradable epoxy resin composition and the degradable epoxy resin material. The degradable epoxy resin composition comprises a component A and a component B, the component A comprises degradable epoxy resin containing a Schiff base structure; the degradable epoxy resin monomer containing the Schiff base structure comprises a compound shown in a formula (I); the component B comprises a degradable curing agent containing the Schiff base structure; the degradable curing agent containing the Schiff base structure comprises a compound as shown in a formula (II); r < 11 >, R < 22 > and R < 23 > are respectively and independently selected from C3-C20 cycloalkylene; and R < 12 >, R < 13 > and R < 21 > are respectively and independently selected from arylene groups with 6 to 30 carbon atoms. Resin prepared from the degradable epoxy resin composition has excellent mechanical properties and can be completely degraded under mild conditions.

The utility model discloses a plasma operation electrode for treating rhinitis, and relates to the technical field of medical instruments. In order to solve the problems that solution instillation and waste suction are inconvenient and the ablation effect is poor in the existing rhinitis plasma ablation electrode, the following technical scheme is provided: the rhinitis plasma ablation electrode comprises an electrode tip, an electrode rod, a handle and a cable joint which are connected in sequence, the electrode rod comprises an inner tube and an outer tube, the tail end of the electrode tip is arranged between the inner tube and the outer tube, and the cable joint is connected with the handle. The inner tube and the outer tube extend into the handle; the tail end of the handle is connected with an instillation tube and a suction tube; an instillation hole is formed in an insulating head, close to the electrode tip, of the front end of the outer tube, and the instillation hole is communicated with the instillation tube through a gap between the inner tube and the outer tube; a suction hole is formed in the middle or the rear portion of the upper end face of the insulating head and communicated with the inner tube, and tissue generated in the operation is sucked out through the suction tube. According to the utility model, the performance of an operation tool is improved, the safety, efficiency and effect of an operation are improved, and a more effective and safer method is provided for treating rhinitis.

The utility model relates to a kind of waterproof silica gel braided tube in the field of braided tube, including braided tube shell, shell connecting end is equipped with sealing ring, the sealing ring interface adopts bionic sharkskin structure, surface evenly distributed limiting protrusion, can reduce fluid resistance, enhance sealing stability and mechanical occlusion, prevent displacement from falling in high pressure or vibration, improve braided tube reliability and durability. Shell surface is outer layer waterproof layer, its layout hydrophobic groove, can make water quickly slide, enhance waterproofness. The inner side of outer layer waterproof layer is middle reinforcing layer, can improve braided tube overall strength and extrusion resistance, avoid deformation damage. Inner layer is silica gel tube, inner wall is provided with spiral flow guide groove, can guide liquid spiral flow, reduce flow resistance, improve conveying efficiency. The braided tube is synergized by each structure, effectively enhance connection sealing property, ensure stable performance, applicable to a variety of requirements for waterproof and conveying efficiency scene.

This invention belongs to the field of concrete technology, specifically relating to an anti-mud polycarboxylate superplasticizer and its preparation method. The anti-mud polycarboxylate superplasticizer is made from zwitterionic monomers, unsaturated functional monomers containing primary amine groups, unsaturated polyether macromonomers, unsaturated acid monomers, formaldehyde, pyrogalactosyl, chain transfer agents, initiators, reducing agents, and deionized water; wherein the zwitterionic monomer is carboxybetaine methacrylate, and the unsaturated functional monomer containing primary amine groups is 2-aminoethyl methacrylate hydrochloride. The product of this invention maintains extremely high effective adsorption capacity with only a low dosage in harsh aggregate environments with a mud content >5%, significantly reducing the sensitivity of concrete to the mud content of sand and gravel.

This utility model relates to the field of magnetic attraction equipment technology and discloses a conical magnetic tamper, including a housing assembly. The housing assembly consists of an upper shell and a lower shell. The inner wall of the upper shell has several slots, and the inner wall of the lower shell is fixedly connected with several buckles. The opposing surfaces of the two shells are provided with steps. The upper shell and the lower shell are initially connected by the slots and buckles and the steps. A special adhesive is applied to the opposing surfaces of the upper shell and the lower shell and cured to form a sealed connection. The surfaces of the upper shell and the lower shell are symmetrically provided with two central holes. A positioning ring is provided on the outer side of each central hole. A coil pressure plate is provided on the inner wall of the lower shell. The inner cavities of the upper shell and the lower shell jointly accommodate the coil. The coil is radially positioned by the positioning ring and axially fixed by the coil pressure plate. By pre-setting the conical inner cavity contours of the upper shell and the lower shell, the ordinary coil can be naturally shaped by the cavity constraint during assembly. It can achieve a fit with the shell without relying on a customized conical coil, thus solving the problem of poor matching between the coil and the shell.