161results about How to "Solve the problem of failure" patented technology

The invention relates to an active vibration reduction boring rod based on an electromagnetic damper, and belongs to the field of machining. The active vibration reduction boring rod based on the electromagnetic damper solves that problem that an existing active vibration reduction boring rod based on a damper is prone to failure, complex in structure and large in manufacturing difficulty. The active vibration reduction boring rod based on the electromagnetic damper comprises a rod body, the electromagnetic damper, a three-axis acceleration sensor and a control system, wherein a tool bit is arranged at the front end of the rod body, and the tool bit is used for clamping a blade; the electromagnetic damper is arranged inside the rod body. When the vibration reduction boring rod is used forboring, the three-axis acceleration sensor is used for measuring acceleration data of the rod body and sending the acceleration data to the control system, and the control system is used for adjustingthe damping coefficient of the electromagnetic damper until the acceleration data that the control system receives reaches the minimum. The active vibration reduction boring rod based on the electromagnetic damper is suitable for fine boring.

The invention discloses a pre-tightening force dynamic monitoring system for a pre-stressed anchor bar strengthening project. The system comprises a deformed steel bar, a retainer plate and nuts, wherein one end of the deformed steel bar is provided with an anchorage; the anchorage is combined with soil mass to anchor the deformed steel bar in the soil mass and stretch the deformed steel bar into a pre-stressed deformed steel bar anchor bar; the outer end of the pre-stressed deformed steel bar anchor bar is provided with an exposed section; the top end of the exposed section is provided with an acceleration transducer and a vibrator; the acceleration transducer is connected with a tensile force detector of the pre-stressed deformed steel bar anchor bar; and a signal acquisition device, a signal analyzing device, a calculating procedure chip, a rechargeable battery and a control main board are built in the detector; the technical scheme overcomes the defects of high use cost, inconvenient operation and maintenance, low testing accuracy, narrow application range, failure of the anchor bar and the like existing in a conventional detection method; and the pre-tightening force dynamic monitoring system is suitable for instantaneous detection and whole-process monitoring of the tensile force of the pres-stressed deformed steel bar anchor bar in the large-area projects of instable soil mass slope, retaining wall, deep foundation pit and the like strengthened by the pres-stressed deformed steel bar anchor bar.

The invention discloses an abnormal account detection method and device. The method comprises the steps of obtaining a to-be-analyzed sample data set; obtaining associated account information and equipment information from the sample data set; obtaining identification information of equipment from the equipment information, and establishing a complex network between the identification informationof the equipment and accounts associated with the identification information according to the equipment information; carrying out community mining on the complex network according to a preset community mining algorithm, thereby obtaining a plurality of community clusters, wherein each community cluster comprises a plurality of associated account nodes; and extracting target community clusters of which number of account nodes is greater than a preset threshold from all community clusters, and determining accounts contained in the target community clusters as abnormal accounts. The problem thatin the prior art, a conventional abnormal account identification method is liable to lose efficacy is solved, and the purpose of relatively comprehensively and deeply identifying the abnormal accountsare realized.

Provided is a nanometer material modified polyethylene agricultural film in the polyethylene technical field. which comprises following components in mass ratio: 91.5-99.3 parts of polyethylene resin,0.2-1.5 parts of inorganic nanocomposite, 0.1-1 part of antioxidant, 0.1-1 part of light stabilizing agent and 0.3-5 parts of processing auxiliary agent. The provided agricultural film has excellentphysical and mechanical performance and weatherability and can be produced into high quality agricultural warmhouse booth film.

The present invention relates to a solar heat-absorbing plate core coated with selective absorption composite film and its preparation method. The basic structure composition of solar heat-absorbing plate core is characterized by that the selective absorption coating-heat-absorbing film coated on the heat-absorbing surface of heat-absorbing metal plate by adopting magnetic control sputtering process is aluminum-nitrogen aluminum (Al-N/Al) composite coating or aluminum-stainless steel-copper (A-ss/Cu) composite coating; and on the heat-absorbing film an optical protective film is coated, said optical protective film has high light transmittance and high weatherability.

The invention discloses an adjustable type electromagnetic damping vibration absorption boring bar, and belongs to the field of mechanical machining. The problems that an existing vibration absorptionboring bar based on a damping device is prone to failing, or complex in structure and large in manufacturing difficulty are solved. The vibration absorption boring bar is characterized in that corresponding relation tables of process parameter combinations and optimal exciting current are preset in a master controller, each process parameter combination comprises rotating speed, the feeding amount, the back cutting depth amount, the workpiece material and boring cutter geometric parameters, the electromagnetic damping device is motivated by the optimal exciting current to enable the radial vibration of a bar body under the corresponding process parameter combination to be minimum, and the master controller searches the process parameter combination closest to the input actual process parameter combination and the corresponding optimal exciting current from the corresponding relation table before the vibration absorption boring bar is used for boring and machining, the master controller is further used for controlling an excitation current source to carry out excitation on an electromagnetic damping device when the vibration absorption boring bar is used for boring, and the electromagnetic damping device is motivated by the optimal exciting current to carry out vibration absorption on the bar body.

The invention discloses a numerically-controlled modular microcomputer power supply overvoltage-undervoltage protection circuit, which comprises a detection part and a transmission part, wherein the detection part comprises at least one detection module; each detection module comprises an undervoltage comparison circuit, an overvoltage comparison circuit and an alarming circuit, each of the undervoltage comparison circuit and the overvoltage comparison circuit is a hysteresis comparator, test voltages are input into the two comparison circuits simultaneously to be compared with a reference voltage, and output of each comparison circuit is connected with the alarm circuit; and a transmission circuit comprises a microcontroller and an LAN bus module, the output of each comparison circuit is connected with the microcontroller, and the microcontroller is connected with an upper computer through the LAN bus module. The numerically-controlled modular microcomputer power supply overvoltage-undervoltage protection circuit can protect a microcomputer power supply module against overvoltage and undervoltage simultaneously, and has the advantages of being small in size, high in precision, safe and reliable, convenient and universal, and more intelligent in transmission.

The invention discloses a power module, which comprises an IGBT module group, IGBT driving boards, a radiator of the IGBT module group, DC busbars connected with IGBT modules, AC copper bars connected with the IGBT modules in parallel, a capacitor group, positive and negative bus copper bars and an intermediate insulating layer, and is characterized in that the IGBT modules, the IGBT driving boards, the DC busbars and the AC copper bars are symmetrically arranged at two sides of the radiator, and the DC busbars, the positive and negative bus copper bars and the intermediate insulating layer are connected into an integral whole together through an output terminal of the capacitor group. The power module disclosed by the invention can reduce stray inductance of the IGBT modules and can reduce turn-off overvoltage of the IGBT modules; the IGBT modules can be arranged at two sides of the radiator, thereby being more compact in structure, and improving the power density; and the AC copper bars are identical in path, so that IGBT current sharing is more excellent, and the reliability is higher.

The invention provides an Archimedean-double-helix flow split type double-cluster hydraulic ejection and fracturing integrated tubular column. Two Archimedean-double-helix flow split nipples and inner cavities of two Archimedean-double-helix flow split hydraulic ejector bodies are specially machined to form an Archimedean-double-helix trapezoid structure, and the surface of a double-helix trapezoid groove is plated with a nickel-based alloy material so as to prevent erosion of the local part of the helix trapezoid groove by fluid due to changes of the rotation direction (rotation angle). The tubular column enables the rotational-flow sand-carried fluid to flow into each nozzle along the helix groove, accordingly, the balance among the particle sand concentration, the flow and the pressure between the Archimedean-double-helix flow split hydraulic ejector in the upstream and the Archimedean-double-helix flow split hydraulic ejector in the downstream of the double-cluster hydraulic ejection and fracturing tubular column is achieved, the objective of simultaneous ejection opening of strata and bushings by the two Archimedean-double-helix flow split hydraulic ejectors is reached, the problem such as the failure in pulling the double-cluster hydraulic ejection and fracturing tubular column by an arranged bottom seal is effectively solved, the practicality is high, the effect is apparent, and the tubular column is applicable to a bottom seal pulled multi-stage hydraulic ejection and fracturing process in horizontal wells.

The invention provides a heat superconductive panel fin radiator with fins on the surface thereof. The radiator herein includes: a radiator substrate; a plurality of heat superconductive heating panels which are parallelly disposed at intervals on the surface of the radiator substrate; each heat superconductive heating panel is provided with a heat superconductive pipeline which is formed therein, and the heat superconductive pipeline is a closed pipeline which is filled with a heat conductive working medium; a radiating fin structure which is disposed on at least one surface of each heat superconductive heating panel; the radiating fin structure includes at least one radiating fin which extends in wave form along the direction in parallel to the surface of the heat superconductive heating panel. According to the invention, the heat superconductive panel fin radiator herein has the characteristics of high fin efficiency, large heat exchange area per unit volume, strong radiating capability, small size, light weight, flexible and various appearance and structure, low cost and small radiator substrate. The heat superconductive panel fin radiator herein can deploy devices with large power, is suitable to lower temperature environment of alpine regions in winter, and addresses the anti-freezing problem of heat pipes and water-cooled radiators.

The invention discloses a sulfonated polyaniline modified sodium bentonite resistance-reducing agent, which is mainly formed by mixing sodium bentonite, carbon fiber, graphene, carbon black, zinc powder, nickel powder, aniline, ammonium persulfate, metanilic acid, ammonium chloride, calcium oxide, sodium polyphosphate, sodium benzoate, cement and a retarder. By preparation at normal temperatures and pressures, dust is not easy to generate, and the product is soluble in water, contains no toxic or harmful substances. Environmental influence is little, construction is simple and convenient, and cost is low. The prepared resistance-reducing agent has low electrical resistivity, good corrosion resistance, good stability and good water-retaining property, is suitable for acidic and alkaline soil, sand, mountainous areas, rocky areas and the like where electrical resistivity is high and water content is easy to change, especially for soil with high electrical resistivity and acidic areas.

The invention discloses an environment-friendly microemulsion capable of being dispersed into nano liquid drops in situ, and a preparation method and application thereof. The microemulsion comprises the following components in parts by weight: 18.5-45 parts of emulsifier, 5-10 parts of water, 0-3 parts of assistant and the balance of biodiesel, totaling 100 parts. The microemulsion has favorable high-temperature stability, solves the problem that the existing nano emulsion treating agent can easily fail in a severe environment, does not generate environmental pollution by using green degradable biodiesel as the raw material, and has favorable lubricating effect. Besides, the microemulsion can be dispersed into nano liquid drops in water in situ, and can perform favorable lubricating and plugging effects on micro/nano cracks in well drilling when being used as a treating agent of the water-base drilling fluid.

The invention discloses a foam type low-temperature flue gas denitration catalyst and a preparation method thereof. The flue gas denitration catalyst consists of the following components in percentage by weight: 60-80% of titanium dioxide, 1-5% of ammonium metavanadate, 1-5% of ammonium paratungstate, 0.1-1.0% of boric acid and 20-35% of aluminum oxide. The denitration catalyst is foamed and can be used for performing denitration reaction at a temperature of 120-400 DEG C. The foam type low-temperature flue gas denitration catalyst is simple in formula, simple in manufacturing process, capable of greatly lowering the construction cost and the energy consumption, great in surface area, high in catalytic activity, stable in chemical property, good in sulfur resistance and long in service life, can be used for successfully realizing effectively removing a nitric oxide component contained in the flue gas at a relatively low temperature to overcome the defect that the conventional high-temperature catalyst has to be used for further heating the tail gas or has to be adjacent to the position of the flue gas vent hole so as to remove a nitric oxide component. Moreover, a measured light-off temperature is lower than 140 DEG C.

The invention discloses a high-performance road multiphalte filling glue, which is prepared by doping an SBS modified asphalt filling glue with modified nano-silica, wherein the doping amount of the modified nano-silica is 5-10% of the total mass of the multiphalte filling glue. According to the present invention, nano-silica is modified with the amino functional silane coupling agent (KH550), andthe temperature adaptation range and the durability of the filling glue are improved by determining the mixing ratio of the nano-silica filling glue, such that the product is suitable for areas withlarge annual temperature difference; and the obtained high-performance road multiphalte filling glue solves the problems of poor durability and easy failure of the filling glue in areas with large temperature difference.

The invention provides a high-power thermally superconducting plate-fin combined radiator for rail transit, comprising: a thermally superconducting plate; a plurality of first bottom substrate spacers, the first bottom substrate spacers being positioned between partially adjacent thermal superconducting plates; a surface contacting with that thermal superconducting plate on both side of the spacerstrip of the first bottom substrate is provided with a first channel, and a plurality of through holes are arrange on the spacer strip of the first bottom substrate; a second bottom substrate spacerstrip positioned between adjacent bottom substrate spacer strip groups; at least one side of that space strip of the second bottom substrate is provided with a second channel on the surface contactingwith the thermal superconducting plate; the surface of the thermally superconducting plate contacting with the spacer strip of the first bottom substrate and the surface of the thermally superconducting plate contacting with the spacer strip of the second bottom substrate are provided with connecting through holes. A heat dissipation fin located on at least one surface of the thermally superconducting plate; The flange is located at the periphery of the thermal superconducting plate, the first bottom substrate spacer, the second bottom substrate spacer and the heat dissipation fin. The invention can effectively solve the problem that the temperature of the power device is not uniform.

The invention relates to the technical field of fireproof coatings, in particular to a hydrophobic efficient fireproof coating and a preparation method thereof. The preparation method of the fireproofcoating comprises the following steps: adding a film forming matter, a modifier and aerogel powder into dispersion equipment, carrying out uniform mixing under stirring, performing heating to 80-100DEG C in a stirring state, and keeping the temperature for 2-3 hours; transferring dispersed slurry into a grinding device, performing cooling to 5-10 DEG C, and performing grinding until the finenessof the slurry reaches 35-45 microns; adding pigments and fillers into the ground slurry, and carrying out grinding and dispersing uniformly; transferring the slurry into the dispersion equipment again, performing cooling to 5-10 DEG C, sequentially adding water, a flame retardant and an assistant, and carrying out dispersion; and stopping dispersing, and carrying out sieving and packaging. According to the invention, the film forming matter, the modifier and the aerogel powder are mixed, then heated and dispersed, and then cooled and ground, so the surface of the aerogel powder is coated andmoisture or other small molecular substances are prevented from entering holes of the aerogel powder; and thus, the problems that the aerogel powder is poor in dispersity and prone to losing efficacywhen applied in coatings are solved, the heat conductivity coefficient of the fireproof coating in an earlier stage of heating is obviously reduced, and fireproof time is prolonged.

The invention belongs to the technical field of electrical materials, and particularly relates to a preparation method of a medium-high temperature self-repairing insulating material. At present, mostof extrinsic self-repairing systems are double-component microcapsule systems, the systems are complex in structure, it is difficult to ensure that a repairing agent can make contact with a catalystand complete self-repairing before failure when a micro-discharge defect occurs, and common single-component system repairing liquid contains unsaturated double bonds and is prone to failure in advance at the medium-high temperature. The preparation method comprises the steps: firstly, synthesizing an imidazole-added epoxy resin matrix with anion catalytic capability, and introducing microcapsulescoated with stable repair liquid into the matrix to endow the insulating material with the capability of repairing micro-discharge defects. When electric branches caused by micro-discharge defects are developed into microcapsules, the microcapsules can be broken, electric branch channels are filled with the repairing liquid, and then the repairing liquid is cured under the catalysis of oxygen anion groups in the channel walls under the medium-high temperature condition, so that the defects of the electric branches are repaired, and meanwhile, the electrical performance is completely recovered.

The invention discloses a vacuum insulation plate which comprises a lower box body, a high temperature resistant O-type seal ring and an upper seal cover, wherein the lower box body is made of rigid PVC and the upper surface of the lower box body is provided with an opening; the upper seal cover is made of stainless steel; a vacuum seal cavity wrapped by the upper seal cover, the high temperature resistant O-type seal ring and the lower box body is formed. The structure and insulation theory of the vacuum insulation plate provided by the application are based on the vacuum structure and vacuum insulation theory of a stainless steel vacuum insulation cup. The vacuum insulation plate provided by the application also has a support framework function, a vacuum seal function, a fire-fighting function and a vacuum insulation function; the vacuum seal function and vacuum insulation function are realized by virtue of the lower box body and the upper seal cover together; Since the lower box body and the upper seal cover are rigid, and have less possibility of being pierced by sharp objects and hard objects during conveying, storage and construction processes, breakage and air admission of the vacuum seal cavity are avoided, and the problem that an existing vacuum insulation plate becomes invalid easily can be solved.

The invention relates to a method and device for precisely and controllably cutting graphene bands through a photo-catalytic oxidation function. The method is characterized by comprising the steps that firstly, graphene with a substrate is fixed to a two-dimensional micromotion platform driven by piezoelectric ceramic; secondly, Z-direction locating of a semiconductor probe is achieved through a magnetostriction mechanism with the help of a power controller; thirdly, an atomizer is used for atomizing auxiliary liquid, and the atomized auxiliary liquid is adsorbed to the surface of the semiconductor probe; and fourthly, an ultraviolet source emits ultraviolet light, the ultraviolet light irradiates the semiconductor probe through a light source transmission device after being focused through a collecting lens, and meanwhile through combination of ultraprecise motion of the two-dimensional micromotion platform in the direction X and the direction Y, the graphene bands with different two-dimensional patterns are cut. By means of the method and device, the problems of equipment corrosion, environment pollution, human body hurt and easy failing caused by using a traditional enhancement reagent and the problems of expensive equipment, complex operation conditions, control difficulty and the like caused by plasma and transition metal are solved.