268 results about "Off phenomenon" patented technology

The invention discloses a silicon-carbon composite material, a preparation method thereof and a lithium ion battery prepared by adopting the material. The preparation method of the silicon-carbon composite material comprises the following steps: (1) mixing a composite material (silica-coated nano-silicon) manufactured by silicon monoxide, a porous carbon-based material and excessive hydrofluoric acid solution to obtain another composite material in which nano-silicon particles are compounded in pores of the porous carbon-based material; and (2) heating a composite material in which nano-silicon particles are compounded in pores of a high polymer-coated porous carbon-based material under an inert atmosphere to obtain the silicon-carbon composite material coated by porous carbon spheres. The process raw materials are accessible and simple to prepare. The silicon-carbon composite material has electrochemical reversible embedded lithium removal performance, greatly relieves efflorescence and falling-off phenomena of active particles in the charge-discharge process and has the high lithium storage capacity characteristic of silicon materials and the high cycling stability of carbon materials, and a battery prepared by the silicon-carbon composite material has better cyclicity.

The invention discloses a locking system and a quick-replacement support assembly with a locking system. The locking system is applied to a battery pack. The locking system comprises a first-level locking mechanism, the first-level locking mechanism is provided with a locking linkage part and a locking base, the locking base is provided with an opening and a cavity extending from the opening, andthe opening is used for a lock shaft of the battery pack to enter the cavity. The locking linkage part moves relative to the locking base to open or close the opening and lock or unlock the battery pack. The locking system further comprises a second-level locking mechanism, and the second-level locking mechanism is arranged on a mobile path of the locking linkage part and used for limiting motionof the locking linkage part relative to the locking base so as to lock the battery pack. The quick-replacement support assembly comprises a quick-replacement support and the locking system, and the locking base and the second-level locking mechanism are connected to the two opposite sides of the same edge of the quick-replacement support respectively. The second-level locking mechanism can limit motion of the locking linkage part relative to the locking base, the reliability of the first-level locking mechanism can be improved accordingly, and the fall-off phenomenon of the battery pack is reduced or avoided.

The invention provides an automatic control detection device and detection method for cigarette combustion coal fall-off performance. The device is characterized by comprising a suction unit, a cigarette clamping unit, a cigarette lighting unit, a cigarette flip unit, a fall-off detection unit and an electric circuit and gas circuit control unit for controlling the operation of the above five units. The suction unit and the cigarette clamping unit are connected by a solenoid valve group, a filter assembly and a corresponding pipe. The cigarette lighting unit is located in front of the cigarette clamping unit; the cigarette flip unit is located on one side of the cigarette clamping unit; and the fall-off detection unit determines the fall-off phenomenon of the cigarette combustion coal via an infrared temperature detection mechanism or a micro differential pressure sensing mechanism. The invention researches and compares the mechanical behaviors of mechanical and human flip of cigarette ash, designs the detection device to ensure that the mechanical behavior of cigarette flip by machinery apparatus is the same as that of human cigarette flip, and provides unified, objective and accurate detection method for the detection of cigarette fall-off tendency.

The invention provides a control method for using color LED light source as backlight source of the LCD, which comprises adopting color LED as the backlight source, time-sharing lightening LED by field sequential system principle, synthesizing color iamge by human-eye visual persistence effect; inserting full-black frame in time-sharing lightening time sequence for reducing round-off phenomenon when displaying dynamic image; mixing lightening backlight source LED of positive sequence and negative sequence for reducing degree of color breakup phenomenon; in addition, the invention provides a method for controlling the dynamic area for further improving contrast. Adopting the control method of the invention can further improve working performance and structure size of the LCD, prolong the service life and increase the color expressive force of the LCD.

Lasers and laser systems generate different wavelengths by nonlinear sum or difference frequency conversion. A wedge-faceted nonlinear crystal compensates for the spatial walk-off phenomenon associated with critical phase matching of a nonlinear crystal in the production of harmonic laser output at peak power.

The invention provides power supply power management method and device as well as modularizing equipment. The method comprises the following steps of: setting corresponding power-off strategies of business modules when all power supply modules and the combination of various power supply modules can not supply power according to the available power of all the power supply modules, the needed power of all the business modules and the priority of all the business modules; detecting power supply states of all the power supply modules in real time; and if detecting that one power supply module can not normally supply power, controlling the corresponding business module to carry out the power-off operation according to the power-off strategy. The invention realizes the rapid powering-off of the business modules on the basis of not adding additional power supply into the modularizing equipment or temporarily carrying out polling judgment operation of power on all the business modules when the output power of a power supply is insufficient, rapidly solves the problem of output power shortage of the power supply and prevents the generation of the whole machine power-off phenomenon caused by overlong overloading time of a bus power supply.

A highly zirconia-based refractory suitable for an electric melting furnace, which has a high electrical resistivity and does not exhibit a chipping off phenomenon and which is scarcely susceptible to extraction of components even when in contact with molten low alkali glass and, hence, is less susceptible to cracking during operation. The highly zirconia-based refractory that includes, as chemical components by mass %, from 85 to 95% of ZrO2 in terms of inner percentage, from 3.0 to 10% of SiO2 in terms of inner percentage, from 0.85 to 3.0% of Al2O3 in terms of inner percentage, substantially no Na2O, from 0.01 to 0.5% of K2O in terms of outer percentage, from 1.5 to 3.0% of SrO in terms of inner percentage, and from 0.1 to 2.0% of Nb2O5 and / or Ta2O5 as a value obtained by [(Nb2O5 content)+(Ta2O5 content / 1.66)], in terms of inner percentage.

The present invention provides preparation and application methods of a carbon fiber mat surface antioxidation coating; after chemical modification of matrix resin by use of an inorganic acid salt, the matrix resin is used as a precursor for blending with inorganic powder, and then coats the surface of a carbon fiber mat thermal insulation material by a brush, and then a high temperature coating with antioxidation and thermal erosion resistance is prepared by curing, carbonization, high temperature and other processes. The raw materials are easy to get, the optional range is wide, the preparation process is simple, the cost is low, the prepared coating structure reduces the specific surface area of the carbon fiber mat thermal insulation material, and further suppresses the aerobic oxidation phenomenon of the carbon fiber mat thermal insulation material at a low temperature, in the environment of high temperature and inert atmosphere, the material surface has a certain of thermal erosion resistance, the service life and long-acting thermal insulation ability of a carbon fiber mat can be prolonged, in addition, the slag-off phenomenon of the coated carbon fiber mat in the use process is suppressed, and the application scope of the carbon fiber mate is broaden.

The invention discloses an abnormal power-off protection method of a VRV air-conditioning system indoor unit. The abnormal power-off protection method of the VRV air-conditioning system indoor unit comprises the following steps that (1) whether a zero cross signal exists or not at present is judged, and if not, the duration time without a zero cross signal is judged; (2) whether the duration time without a zero cross signal exceeds a preset threshold value t1 or not is judged, if yes, the current operation mode of an air conditioner is judged, and an electronic expansion valve is controlled to a corresponding position according to the operation mode; and in the step (1) if an indoor unit single-chip microcomputer does not detect a zero cross signal, a power supply circuit of the indoor unit single-chip microcomputer is automatically switched to an energy storage circuit to supply power. According to the abnormal power-off protection method of the VRV air-conditioning system indoor unit, the indoor unit single-chip microcomputer judges an abnormal power-off phenomenon of the indoor unit by detecting the zero cross signal, the opening degree of the electronic expansion valve is adjusted and controlled according to the current operation mode of the air conditioner, refrigerant backflow is prevented, and an insufficient evaporation phenomenon is prevented. The arrangement of the energy storage circuit is the premise for guaranteeing that the indoor unit single-chip microcomputer can work when power is off.

The invention discloses an application of a carboxymethyl chitosan self-crosslinking polymer in a silicon negative electrode of a lithium ion battery. The carboxymethyl chitosan self-crosslinking polymer is obtained by adding carboxymethyl chitosan to cross-liking agent 1-(3-(dimethylamino propyl)-3-ethyl-carbodiimide hydrochloride in a self-crosslinking manner; the polymer has a three-dimensional structure, and is taken as a binder to be applied to preparation of the silicon negative electrode of the lithium ion battery; the self-crosslinking polymer shows high mechanical performance and adhesive property; chemical bonds with self-repairing capability are formed between the self-crosslinking polymer and the silicon particles; the silicon negative electrode with large volume change in the charging-discharging process can be effectively accommodated; the powder-fall-off phenomenon with structural damage caused by severe volume changes of the silicon particles in the circulating process of the silicon negative electrode is solved; and a new approach for improving the cycle performance of the silicon negative electrode of the lithium ion battery is provided.

The invention discloses a repairing method for a bearing bush. The method comprises the following steps: (1) detecting a damaged part of the bearing bush; (2) washing the bearing bush, and removing anoxidation film and oil stain on the surface of the bearing bush; (3) using a coaxial carrier gas powder sending technology, sending Babbitt metal powder to the damaged part and performing laser cladding, and forming a first cladding layer; (4) performing laser remelting on the first cladding layer area; (5) performing the laser cladding on the remelted first cladding layer, and forming a second cladding layer; and (6) checking and mechanically processing. The method is capable of, through performing the laser remelting on the first cladding layer area formed by the laser cladding, performingsecondary laser cladding, and forming the second cladding layer simultaneously and metallurgically bonded with the first cladding layer and an original Babbitt metal layer. In a using process, even ifthe first cladding layer is separated from a matrix, an overall falling-off phenomenon does not occur, the normal use of the bearing bush can be still ensured, service life is prolonged, a repairingagent layer does not need to be sprayed, and cost is saved.

The invention relates to an automated monitoring system of resistance spot welding process of a sedan body, which is realized by a hardware system and a software system and is characterized in that a hardware terminal acquiring display device comprises two parts, namely a spot welder monitor host and an actual parameter display extension set after welding operation, wherein the spot welder monitor host is provided with a Hall sensor for acquiring electrical parameters, executes acquiring treatment of the electrical parameters in the welding process and uploads the treated data results to a network personal computer for secondary treatment. The invention has the advantages as follows: the production progress is not stopped, and the quality of each welding point is endowed with traceability; the quality state of wielding points can be fed back in time and be informed to operators by voices in time, and the welding sealing-off phenomenon can be avoided by tracing and controlling current compensation in the welding process; the operators are informed timely to repair electrodes so as to realize management of electrode end surface and reduction of welding quality defects; and the system provides service for production management visualization.

The invention relates to a low-emission gasoline grass pruning machine with a carburetor realizing throat gap atomization. According to the invention, gaps and shaking vibrating reeds are added to a throat; a stack-cutting grass pruning steel wire rope replaces a nylon wire for facilitating long-term efficient cutting; a cutting knife disc with inner saw teeth is beneficial to preventing of a cutter back-off phenomenon; 3-8 gaps of a multi-branch nozzle squeeze towards multiple directions in a dispersing way, and by virtue of vibration formed by reciprocating shaking of the multiple vibrating reeds among the multiple gaps distributed on the periphery of an outlet pipe, rapid mixing atomization between liquid and airflow from an air filter can be accelerated, so that poly-oil mixture dispersion is facilitated; and a long grass pressing wheel 74 performs grass pressing for preserving soil moisture and is also applied to knurling on the ground. The cutting knife disc with the inner saw teeth changes the cutter back-off state mainly depending on the inner saw teeth. With a low-emission gasoline engine combining the carburetor with the multiple-branch nozzle with throat gap atomization, double accessory vents and scavenging duct wedge turbulence back flow of a tank block, and double accessory skirts of a piston, the quality and use convenience of the low-emission gasoline grass pruning machine are improved.

The embodiment of the invention discloses a method for preventing an adapter or a mobile power supply from being powered off in a charging process. The method comprises the following steps: obtaining a charging voltage, and carrying out constant-current charging when the charging voltage is smaller than or equal to a first voltage threshold; periodically detecting the charging voltage in the constant-current charging process; and lifting the constant-current charging current to a first preset value when detecting that the charging voltage is greater than or equal to a second voltage threshold. The embodiment of the invention further correspondingly discloses a device for preventing the adapter or the mobile power supply from being powered off in the charging process. According to the method and the device for preventing the adapter or the mobile power supply from being powered off in the charging process, an overload phenomenon of a terminal along with rise of a battery voltage of a mobile phone in the charging process can be prevented; a charging power-off phenomenon caused by an overload is reduced; and the user experience is improved.

The invention discloses blue light absorbent and belongs to the technical field of corneal contact lenses. The blue light absorbent is prepared from a compound in the following general formula (please see the general formula in the specification). The invention further discloses a blue-light prevention corneal contact lens containing the blue light absorbent and a manufacturing method of the blue-light prevention corneal contact lens. The novel blue light absorbent is adopted, and the defects that existing blue light absorbent is poor in intermiscibility, prone to running off, poor in biocompatibility and the like are overcome; due to the fact that unsaturated double bonds are contained in the novel blue light absorbent and the blue light absorbent can participate in polymerization of the lens, the running-off phenomenon occurring in the later-stage treatment and using processes of the blue light absorbent is effectively avoided, and the damage to the eyes due to release of the blue light absorbent in the wearing process is effectively prevented. By means of the preparing method of the corneal contact lens, the indexes such as the light transmittance, the oxygen permeation coefficient, the focal power definition and liposuction performance of the prepared lens are better than those achieved through an existing method, and good practicability is achieved.

The invention discloses a method for preparing an ordered porous aluminum oxide film-transparent conductive glass composite substrate in the technical field of conducting materials. The method comprises the following steps of: respectively depositing a titanium layer, a tungsten layer and an aluminum layer on the transparent conductive glass by using a magnetron sputtering method; performing annealing heat treatment and anodic oxidation treatment on the aluminum layer obtained by sputtering to obtain a porous anodic aluminum oxide film; and finally, reaming the porous anodic aluminum oxide film and removing an oxidized barrier layer to prepare an ordered porous aluminum oxide film. The method relieves the stress of the aluminum layer subjected to sputtering, and enhances the binding force between the aluminum layer, the tungsten layer and the titanium layer and the transparent conductive glass substrate. Therefore, the bubbling and falling-off phenomena during aluminum anodic oxidation are avoided; a highly ordered porous aluminum oxide film is prepared on the transparent conductive glass; and the pore diameter is accurately controllable in a range from 40 to 80 nm.

The invention provides a method for producing printed adhesive padding cloth. The method is characterized by comprising the following steps of: a, refining; b, arranging for the first time; c, printing, namely, printing decorative patterns on base fabric by a transfer printing mode; d, arranging for the second time; and e, adhering. The method has the characteristics of integrating the characteristics of the fabric with those of the padding cloth into a whole, making the transfer printed patterns have vivid effect, exquisite decorative patterns, clear level and strong stereoscopic impression, and endowing the fabric stronger perceptual effect and three-dimensional handfeel. The printed adhesive padding cloth with various decorative patterns is adhered on part of the surface of clothes of coating fabric, similar to down jackets, so that the style of the whole clothes is changed and pursue of young people for fashion personalization can be met. The printed adhesive padding cloth is organically adhered with the fabric by heating, force stressed on every inch of the padding cloth is uniform, and the padding cloth has high water wash resistance and rubbing resistance, so in the water wash process, the fall-off phenomenon can be avoided and the original characteristic of the clothes can be remained.

To provide a two-cycle combustion. engine having a two-staged piston, which is simple in structure and inexpensive and in which an undesirable blow-off phenomenon of the air-fuel mixture can be avoided effectively, the two-cycle combustion engine includes a cylinder block <bold>1 < / highlight>having a two-staged cylinder bore defined therein and having a reduced diameter bore portion <bold>1< / highlight><italic>a < / highlight>and a large diameter bore portion <bold>1< / highlight><italic>b, < / highlight>and a two-staged piston <bold>10 < / highlight>having a reduced diameter piston portion <bold>10< / highlight><italic>a < / highlight>and a large diameter piston portion <bold>10< / highlight><italic>b < / highlight>and drivingly accommodated within the two-staged cylinder bore. An annular auxiliary chamber <bold>11 < / highlight>is defined between the two-staged cylinder bore and the reduced diameter piston portion <bold>10< / highlight><italic>a < / highlight>of the two-staged piston. The two-cycle combustion engine also includes an air-fuel mixture passage <bold>21 < / highlight>for introducing the air-fuel mixture into a crank chamber, an air passage <bold>24 < / highlight>for introducing an air into the auxiliary chamber <bold>11, < / highlight>a scavenge passage <bold>30 < / highlight>for supplying the air-fuel mixture within the crank chamber <bold>29 < / highlight>into a combustion chamber, and injection passages <bold>70 < / highlight>and <bold>70< / highlight>A for injecting the air within the auxiliary chamber <bold>11 < / highlight>into the combustion chamber <bold>2. < / highlight>

The invention relates to the technical field of solar cell sorting devices and discloses a solar cell sorter comprising a control system, a detector and a conveying device. The number of rows of probes and the number of probes in each row can be increased, decreased and adjusted as needed so as to adapt to cell pieces of different grating numbers. A novel feeder is disclosed. The material box locating and jacking process is more stable and reliable, and trays can be put in from two directions. According to the conveying device, the whole module can be disassembled and assembled independently,assembly time is shortened, maintenance is convenient, maintenance cost and maintenance difficulty are lowered effectively, the module can be matched with different functional modules for use easily,the whole matched precision of the conveying part is higher through integrated design, and shaking and deflection phenomena often appearing in the belt conveying process are prevented effectively. A novel sorting device is disclosed. The space utilization rate is high, and manufacturing cost is low. According to a material storage box structure, the breaking problem caused by concentrated stress during sorting falling of the cell pieces can be prevented, the sliding-off phenomenon is prevented, and manual material fetching is convenient.

The invention relates to electronic product manufacturing technology equipment, and particularly provides automatic conducting strip sticking, welding and bending equipment and a machining technology thereof. The equipment comprises a workbench, and the workbench is provided with a rotary plate, a feeding device and a discharging device. The automatic sticking, welding and bending equipment is characterized in that the rotary plate is provided with a gripping device and sequentially provided with a strip feeding device, a welding device, a first bending device and a second bending device along the edge. By adopting the equipment, automatic conducting strip sticking, welding and bending can be achieved, and integrated production of welding and bending can be achieved by arranging the welding device, the first bending device and the second bending device on the workbench; meanwhile, through cooperation of the first bending device and the second bending device, a conducting strip can be stressed uniformly in the bending process, and the fall-off phenomenon cannot occur.

The invention discloses a pretreatment method of a copper insert of a storage battery terminal. The pretreatment method comprises a treatment of dipping in a soldering flux and a liquid metal presoaking treatment, wherein the treatment of dipping in the soldering flux is performed by dipping the part to be cast of the copper insert in the soldering flux; and the liquid metal presoaking treatment is performed by soaking the copper insert dipped with the soldering flux in molten metal liquid of tin or terne metal. The pretreatment method of the copper insert of the storage battery terminal, disclosed by the invention, is simple to operate, and the copper insert is firmly bonded with a lead alloy; and a good fusion connection interface without gaps is arranged between the copper insert and the lead alloy in the storage battery terminal. According to the pretreatment method of the copper insert of the storage battery terminal, disclosed by the invention, the contact capability and the bonding strength between the copper insert and the lead alloy are improved, and the copper insert is less prone to flaking off; and the effective sectional area of current circulation is ensured, and the scrappage of a storage battery caused by the flaking-off phenomenon of the copper insert is simultaneously reduced.

The invention discloses preparation and an application method for iridium complex phosphorescent materials. A series of dithio compounds such as N,N-disubstituted dithio carbamates, or O,O-disubstituted dithio phosphates and alkoxy-substituted dithio formats are subjected to dissociation of dichloro bridged complex of iridium, and iridium complexes shown as a formula (I), a formula (II) or a formula (III) are generated. The iridium complexes can be used for detecting mercuric ions and acetonitrile; and through influence of Hg2+ on physical, electrochemical and sensing properties of the iridium complexes, the iridium complex phosphorescent materials identify the Hg2+ in high selectivity, high sensitivity and quick response, the turn off phenomenon occurs, and a phosphorescent sensor for detecting the Hg2+ can be manufactured. By changing a solvent for detecting, a turn on phenomenon occurs and a novel sensor for detecting acetonitrile can be manufactured.

A two-cycle combustion engine having a two-staged piston, is simple in structure and inexpensive and addresses a undesirable blow-off phenomenon of the air-fuel mixture. The two-cycle combustion engine includes a cylinder block having a two-staged cylinder bore with a reduced diameter bore portion and a large diameter bore portion, and a two-staged piston having a reduced diameter piston portion and a large diameter piston portion. An annular auxiliary chamber is defined between the two-staged cylinder bore and the reduced diameter piston portion. The two-cycle combustion engine also includes an air-fuel mixture passage for introducing the air-fuel mixture into a crank member, an air passage for introducing air into the auxiliary chamber, a scavenge passage for supplying the air-fuel mixture within the crank chamber into a combustion chamber, and injection passages and for injecting the air within the auxiliary chamber into the combustion chamber to counter a press-out issue.

The invention discloses an IGBT device fault detection method and a corresponding detection circuit. The fault detection method comprises the steps of: S1, arranging comparators corresponding with the number of bonding leads, presetting a comparison value among a plurality of comparators, and setting a programmable device electrically connecting with the plurality of comparators; S2, after an IGBT device is open, measuring the grid voltage value of the IGBT device, and inputting the grid voltage value into the plurality of comparators to compare with the comparison value among the plurality of comparators, the comparators correspondingly feeding back a first signal and a second signal; and S3, outputting a feedback result of the plurality of comparators by the programmable device to generate an output signal. According to the IGBT device fault detection method, without dismounting the IGBT device, whether the bonding leads exist falling off phenomena and the number of leads fallen off can be determined in advance, thereby avoiding falling off of other leads caused by falling off of one lead, and finally avoiding faults of the IGBT device or even system paralysis.

The invention relates to an automatic material-loading device of a terminal crimping machine. The automatic material-loading device comprises a pedestal, a rotating plate, a drive mechanism and a material guiding element. The rotating plate is arranged at the pedestal in a rotating mode; a plurality of laying-off holes are uniformly formed at the circumference surface of the rotating plate; a blanking hole communicated with the laying-off holes is formed in the pedestal. The material guiding element is provided with a material guiding slot communicated with the blanking hole. A material blocking plate is arranged at one side, facing the rotating direction of the rotating plate, of each laying-off hole inside the rotating plate and is used for preventing materials from falling off from the laying-off hole loaded with the materials to the inside the rotating plate during the rotating process, thereby improving the automatic feeding efficiency. A cover plate covers the rotating plate and a feeding inlet is formed in the cover plate; and a feeding hopper is arranged at the feeding inlet. With the rotating plate and the feeding hopper, the material storage capability of the automatic material-loading device can be substantially improved; and the number of times for material loading can be reduced. The provided automatic material-loading device has advantages of simple structure, convenient processing and manufacturing, low cost, and stable material laying off; and a material clamping phenomenon or wrong laying-off phenomenon can be reduced.

The invention relates to a method for solving the peeling-off phenomenon of oxidized scale during welding of a pickling plate for a compressor. Chemical components of a plate blank are optimized and controlled by a steelmaking process, and the chemical components of the plate blank are as follows based on percentage by mass: 0.045 to 0.075 percent of C, less than or equal to 0.08 percent of Si, 0.15 to 0.30 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.010 percent of S, 0.015 to 0.050 percent of Als, less than or equal to 0.020 percent of Nb, less than or equal to 0.020 percent of V, less than or equal to 0.020 percent of Ti and the balance of Fe; and the microstructure of the pickling plate is controlled by a hot rolling process, and the hot rolling process particularly comprises the steps of heating the plate blank, performing rough rolling, performing finish rolling, reeling and performing hot reeling to obtain a finished product, wherein the finished rolling process requires the final rolling temperature to be 890 to 910 DEG C, reeling is conducted when cooling is conducted to 680 to 700 DEG C at the cooling speed of 18 to 25 DEG C / s after finish rolling, and a laminar cooling mode adopts back segment cooling. By the method, good matching of the components, structure and forming property of the pickling plate finished product can be realized, flexible control on the oxidized scale structure in a heat affected zone is realized and the peeling-off phenomenon is avoided.

The invention discloses manufacturing technology and equipment for a steel lining polyurethane composite tube. The manufacturing technology for the steel lining polyurethane composite tube comprises the steps of removing rust from the inner wall of the steel tube; smearing an adhesive; preparing a polyurethane sizing material; then injecting into the steel tube; carrying out centrifugal casting; vulcanizing at a constant temperature; and finally obtaining the steel lining polyurethane composite tube. The equipment for realizing the production technology comprises the steel tube, shield caps, a base, brackets, a heat preservation device and a centrifugation device. By the centrifugal casting, the lining and the steel tube are combined tightly; the fall-off phenomenon of the lining during a using process of the steel lining polyurethane composite tube can be significantly reduced; the lining thickness is adjusted by controlling the amount of added raw materials in the casting process; the centrifugal casting prevents the problem of non-uniformity of the lining thickness and increases casting quality; and the centrifugation device can adjust the rotation speed of processing tubes and can meet production technology requirements of different centrifugal degrees.

The invention relates to a preparation method for a negative plate, and provides a copper-silicon negative electrode and a preparation method therefor. A negative electrode active material contains silicon; and the negative electrode active material is welded on a current collector through metal. According to the copper-silicon negative electrode, the electrode active material is welded on the surface of the current collector through metal, so that the negative plate is endowed with excellent metal conductivity; the negative plate is directly welded through the metal and a silicon-copper composite material, so that the action force among the materials is high without causing a peel-off phenomenon of the active substance; the negative plate is prepared from the metal and the silicon-copper composite material, so that the prepared negative plate can be well compressed, the thickness of a pole piece is thinned, and the volume energy density of the battery is improved consequently.

The invention discloses a micro limit general switch based on double elastic components. The switch comprises a casing, the casing is internally provided with a normally-open connector, a normally-closed connector and a common connector, one end of each connector extends out of the casing, the casing is internally provided with a moving contact and a guiding assembly which limits the movement track of the moving contact, the moving contact is in linked connection with an elastic assembly and a triggering assembly successively, and the elastic assembly and the triggering assembly drive the moving contact to move; the elastic assembly comprises a main spring, an auxiliary spring which generates an auxiliary downward pressure and a movable block which is penetrated by the main spring and abuts against the guiding assembly in a swinging manner; and the movable block includes an arched contact surface which makes contact with an inclined plane of the guiding assembly. According to the invention, the elastic assembly services as a driving mechanism of the switch, generates an elastic force, and realizes switching of the switch; and in the switching process, the vertical pressure generated between the arched contact surface and the inclined plane of the guiding assembly acts on the moving contact, and a flickering or power-off phenomenon due to equilibrium and micro movement generated when the moving contact is jumped from a normally-closed state to a normally-open state or from the normally-open state to the normally-closed state is avoided.