156results about How to "Life-span-reducing effects" patented technology

The invention discloses a matching method of a power battery pack. The power battery pack is obtained by sequentially connecting cells in parallel and in series. The matching method of the cells connected in parallel comprises: acquiring the capacity of each cell; performing cycle charge and discharge according to a charge-discharge rate required by the purpose, and recording charge and discharge curves; calculating a voltage-dependent electric quantity change rate dQ / dV curve of the discharge curve, wherein the dQ / dV curve has two peaks; searching for voltage values corresponding to the peaks according to the dQ / dV curve, finding electric quantity values of the corresponding cells in the discharge curve according to the voltage values, and calculating a difference Dn between the electric quantity values; acquiring the self-discharge rate of each cell; acquiring an internal resistance value of each cell; grading Dn according to the values into a plurality of large groups, and classifying the cells into the corresponding large groups according to the tested Dn values, wherein the cells in each large group are classified into a plurality of medium groups based on the value of the self-discharge rate, and the cells in each medium group are classified into a plurality of small groups according to the internal resistance values of the cells; selecting a plurality of cells in the same group for matching.

The invention discloses an overspeed protection device of a turbine. The turbine comprises a stop electromagnetic valve, a stop electromagnetic valve power supply circuit and a speed measuring gear. The overspeed protection device of the turbine comprises two sets of same electronic overspeed protection devices and an OR gate, wherein the input end of the OR gate is connected with the output endsof the two electronic overspeed protection devices respectively, and the output end of the OR gate is connected with the stop electromagnetic valve power supply circuit, wherein each electronic overspeed protection device comprises three measuring channels and a two-in-three overspeed protector for receiving the output signals of the three measuring channels; each measuring channel comprises a speed measuring probe, rotation speed modules and a relay which are connected sequentially and mounted on the speed measuring gear; and the input end of any rotation speed module in the same electronic protection device is connected with the input ends of the other two rotation speed modules. In the invention, by adopting the electronic devices, the action is reliable, and the rotation speed of the machine set does not need to be increased to the action rotation speed in the testing process, thus the safe operation is guaranteed, the cost is saved, the turbine is protected, and the system is simpler.

The invention relates to the industrial evaporation field, and especially relates to a positive-displacement compressor MVR heat pump evaporation system with an adjustable pressure ratio working station. The system is composed of a feed pump, a preheating device, a hierarchical evaporator, a positive-displacement water steam compressor, a separator, a condensation water tank, and a discharge pump; and the condensed water in the hierarchical evaporator bottom can be used for the secondary preheating on the fresh material liquid. The technical scheme mentioned above has the following advantages: (1) the solution evaporation parameters can be stably controlled, the condensed water stored in the preheating device and the hierarchical evaporator bottom can be used to preheat the fresh solutions in different levels so as to raise the solution temperature to the evaporation temperature before the solution enters the evaporation liquid room of the hierarchical evaporator, and thus the system unbalance caused by the temperature fluctuation of feed material is avoided; (2) a high-temperature water spraying mode and a low-temperature water spraying mode are adopted on the positive-displacement water steam compressor, thus the residual heat of condensed water can be fully utilized, the water amount can be adjusted at the same time, the actual pressure ratio of a positive-displacement water steam compressor can be adjusted, and the goal of adjusting the pressure ratio working conditions is achieved.

The invention provides a ball grid array (BGA) balling single-point repair method. The BGA balling single-point repair method includes: step one, removing an oxide layer and pollutants on the surface of a ball leaking pad on the bottom surface of a BGA chip; step two, taking paste scaling powder, and spreading the paste scaling powder on the ball leaking pad; step three, placing a solder ball with the diameter matched with that of the pad on the pad coated with the paste scaling powder in the step two; step four, heating the position where the solder ball is placed by using a heat gun in a mode that output air of the heat gun is perpendicular to the bottom surface of the BGA chip; and step five, closing the heat gun after the solder ball is melted, and detecting whether repair is successful after the heat gun is closed.

The invention discloses rare earth microalloying bearing steel and a preparation method thereof and belongs to the technical field of bearing steel manufacturing. According to the technical aim, the performance of the bearing steel is improved. According to the rare earth microalloying bearing steel, converter, LF-RH refining and square billet continuous casting are carried out, electroslag remelting is carried out after scaling of a prepared continuous casting billet, then cover cooling and pit cooling are carried out, and then primary heating rolling cogging is carried out; after annealing or slow cooling is carried out, checking and cleaning are carried out, and a primary rolled steel billet is prepared and subjected to secondary heating rolling; and after stack cooling or slow coolingis carried out, a secondary rolled steel billet is prepared and subjected to spheroidizing annealing, straightening, polishing or scaling, flaw detection, cleaning and checking are carried out, and then the rare earth microalloying bearing steel is prepared. The content design ingredient of Nb ranges from 0.010% to 0.45%, and the rare earth microalloying bearing steel is suitable for being used for manufacturing various bearing rings and rolling elements and roller pins within a wide size range.

The invention discloses an electric vehicle charging control method. The method comprises the steps of receiving charging control command information, and determining the charging mode and the charging current control mode according to the charging control command information; obtaining charging stop SOC according to the charging mode, and determining charging current according to the charging current control mode; conducting charging control on a power supply unit and a power battery of an electric vehicle according to the charging stop SOC and the charging current. By the adoption of the method, the service life of the power battery can be prolonged. The invention further discloses an electric vehicle charging control system.

The invention relates to a thermoelectric separation power type light-emitting diode bulb with high integration and high lighting effect, comprising a case, a circuit board and light-emitting diodes, wherein the circuit board is arranged in the case, the light-emitting diode is arranged on the circuit board, the case is a non-metal hollow case, air holes are arranged on a lower side, the lower side of the circuit board is provided with radiation pillars which are fixed the light-emitting diodes in one-to-one correspondence, heat is radiated by virtue of the radiation pillars which are independently corresponding to the light-emitting diodes, independent heat radiation technical effect realized by a heat radiation pillar body with large heat radiation area to a corresponding light-emitting diode is effectively enhanced, heat produced when an LED (light-emitting diode) lamp gives out light is better transferred to the air and radiated, so as to solve problems of heat transfer and heat radiation in a using process, and service life of the LED lamp is guaranteed.

The invention discloses a preparation method of a crystalline silicon solar cell. In the passivation process technology of the back surface of a silicon wafer, because aluminum oxide has constant negative charge, the composition of the back surface can be lowered, and the same time, because silicon nitride in rich in hydrogen, passivation can be realized effectively, and in addition, the passivation overlapping layers of aluminum oxide and silicon nitride act as a back reflector, the absorption of long beam waves can be improved greatly, the passivation overlapping layers are positioned between a back surface electrode and the silicon wafer, the warping degree of the crystalline silicon solar cell can be lowered greatly, and the influence on the lifetime of a minority carrier in the silicon wafer can be lowered effectively; and when the back surface electrode is manufactured, because the passivation overlapping layers for the corrosion depth in the corrosion region is just removed, the problem that the back surface electrode and the silicon wafer have less possibility of forming favorable ohmic contact due to the back surface passivation of the silicon wafer can be solved effectively, at the same time, a dense network structure is formed by connecting all the adjacent electric conducting materials by utilizing a silver wire, and the network structure is especially favorable for the collection and conduction of back surface current carriers of the silicon wafer.

The invention discloses a fuel cell direct current-direct current converter and a control method thereof. The fuel cell direct current-direct current converter comprises a filter energy storage capacitor which is connected with the direct current input end, a first BUCK energy-releasing compound circuit, a second BUCK energy-releasing compound circuit, a first full-bridge circuit, a second full-bridge circuit and a BOOST circuit, wherein the first BUCK energy-releasing compound circuit and the second BUCK energy-releasing compound circuit are in parallel connection, the first full-bridge circuit is at the back stage of the first BUCK energy-releasing compound circuit, the second full-bridge circuit is at the back stage of the second BUCK energy-releasing compound circuit, and the BOOST circuit is in series connection with the first full-bridge circuit and the second full-bridge circuit. By means of the fuel cell direct current-direct current converter and the control method thereof, the BUCK circuits and the energy-releasing circuits are compounded, the output current ripple of a fuel cell can be reduced, and the problem that the output capacity is occupied when electric charges are accumulated inside the fuel cell can also be solved, so that the main topology has the advantages of having low loss, high efficiency and small ripple waves.

The invention discloses a reconfigurable microcomputer protection development platform based on an FPGA. The development platform is characterized by comprising an FPGA chip supporting a Microblaze soft core, an internal storage, an external storage, a parallel interface FRAM, a cache, an AD converter, a hardware frequency measurement circuit, a watchdog circuit, a level shifter, a real-time clock, an external communication interface, an internal communication interface and an Ethernet interface, wherein the external storage, the parallel interface FRAM, the cache, the AD converter, the hardware frequency measurement circuit, the watchdog circuit, the level shifter, the real-time clock, the external communication interface, the internal communication interface and the Ethernet interface are respectively connected with the FPGA chip through AXI buses; logical decoding and protection calculation are fused together, and work efficiency is improved greatly. Logic control is encapsulated to an independent IP core according to a functional unit, the IP core is provided with a simple command interface, accordingly, complex procedures are simplified, complicated operations on an external device can be completed through an application software program only via command words, and programming is simplified. The functional unit having high requirements for the speed and real-time performance is achieved through hardware description languages, the characteristics of parallel computation and access according to positions of the FPGA are fully utilized, and the requirement for protecting the speed and real-time performance of the platform is achieved.

The invention relates to an electronically-controlled common rail heavy oil injector which comprises an injector body, an electro-hydraulic control member and a nozzle member. In the electro-hydrauliccontrol member, a ring groove is formed in the middle of the outer side of a guide sleeve, a transverse through hole is formed in the middle of the groove to directly communicate with a middle hole of the guide sleeve, the two sides of the ring groove are provided with seal rings, and the interior of the oil injector is divided into three chambers. A control valve core guide section is provided with three ring grooves, and the second ring groove is in communication with the transverse through hole in the middle of the guide sleeve. An electromagnetic component is in contact with cooling oil,a cooling oil circuit is isolated from a fuel oil circuit by means of dynamic sealing, static sealing and drainage manners, and corroding and thermal damage of heavy oil to electronic components can be effectively prevented; and a sinking groove is formed in the middle of the top end of an orifice plate, a ball valve seat guide sleeve can be sleeved with the sinking groove of the orifice plate tobe in clearance fit with a ball valve seat, and a certain guiding ability for axial movement of the ball valve seat is achieved.

The invention discloses an anti-collision system and method of bulk cargo storage yard stand-alone equipment. The system comprises the stand-along equipment. The stand-alone equipment comprises a walking mechanism, a cantilever support, a cantilever, a GPS differential positioning substation, a taking machine, a positioning support, a gyro sensor, a walking information identification device and a control terminal, wherein the walking mechanism is arranged at the bottom of the stand-alone equipment, the cantilever support is arranged on the walking mechanism, one end of the cantilever is pivoted to the cantilever support, the GPS differential positioning substation is arranged between two stand-alone devices on the ground, the positioning support comprises a fixed part and a moving part, the fixed part is fixedly arranged in a taking machine pivotal axis through hole, the middle of the moving part is slidably connected with the fixed part, the gyro sensor is arranged at the other end of the moving part, the walking information identification device is arranged on the walking mechanism, and the control terminal is arranged on the ground. The anti-collision system is long in service life, does not need to be frequently maintained and can be widely popularized, manpower is greatly saved, and labor intensity is greatly reduced.

The invention provides a hydraulic system of an empty container stacking locomotive. The hydraulic system comprises circulating oil circuits. Hydraulic oil in an oil tank is led into an integrated multi-way valve by dual-gear pumps, and hydraulic oil in the integrated multi-way valve is respectively supplied into lifting cylinders, tilting cylinders and a steering cylinder by the aid of a pilot control handle, so that the respective circulating oil circuits can be formed; the oil tank is connected with a gear pump, an output end of the gear pump and an output end of the pilot control handle are connected with inlet ends of a quick lifting valve bank, and an outlet end of the quick lifting valve bank is connected with the lifting cylinders by a first backpressure check valve; the lifting cylinders are connected with an emergency descending valve by speed limit valves, and an electromagnetic valve of the emergency descending valve is connected with a manual switch by an electric wire; the tilting cylinders are connected with direct-acting overflow valves, and the integrated multi-way valve is connected with the tilting cylinders and the direct-acting overflow valves respectively, so that circulating oil circuits can be formed. The hydraulic system has the advantages that tilting, steering and lifting functions and the like can be integrated, so that pipeline arrangement can be reduced, the work safety of lifting appliances can be improved, and the gantry lifting speed can be increased.

The invention is applicable to the technical field of lithium ion batteries, and provides a charging method and device of a lithium ion battery and terminal equipment. The method comprises the following steps: obtaining a first relation between the remaining electric quantity and an open-circuit voltage of the lithium ion battery, a second relation between the remaining electric quantity and the ohmic internal resistance of the lithium ion battery, and a third relation between the remaining electric quantity and a polarization voltage of the lithium ion battery; and performing polynomial fitting on the first, second and the third relations according to the estimated temperature of the lithium ion battery, obtaining the estimated temperature of the lithium ion battery, and performing charging current optimization according to the estimated temperature to obtain a charging current sequence with the minimum battery temperature increment after optimization. According to the invention, thetemperature increment of the battery in the charging process is relatively low, the charging time is shortened, the influence of temperature rise on the service life of the battery in the charging process is reduced, and the charging efficiency is improved.

The invention discloses a multi-layer driving anti-slip control method suitable for an electric wheel driving vehicle. The method comprises the steps of 1, determining a first active driving anti-slipcontrol torque according to an optimized objective function, and conducting wheel torque distribution according to the first active driving anti-slip control torque; 2, comparing an actual slip ratioof driving wheels with a target slip ratio, when the actual slip ratio is not smaller than the target slip ratio, determining a second active driving anti-slip control torque of the wheels and a passive driving anti-slip control torque of the wheels, and when the actual slip ratio is smaller than the target slip ratio, repeating the first step; 3, obtaining a third active driving anti-slip control torque according to the second active driving anti-slip control torque and the passive driving anti-slip control torque, and conducting wheel torque distribution according to the third active driving anti-slip control torque.

The invention a liquid discharging apparatus which can reduce configuration constrains of a cooling component so as to enable the configuration freedom degree of the cooling component to be higher ina circuit substrate with a drive circuit. The liquid discharging apparatus includes a print head that has a driving element and discharges a liquid when a drive signal is applied and the driving element is driven, a drive signal generation circuit that generates the drive signal based on a drive signal generation control signal for controlling generation of the drive signal, and a drive circuit substrate on which the drive signal generation circuit is provided. The drive circuit substrate has an input connector that inputs the drive signal generation control signal into the drive circuit substrate and an output connector that outputs the drive signal from the drive circuit substrate. A distance between the input connector and the output connector is shorter than a distance between the drive signal generation circuit and the input connector. The distance between the input connector and the output connector is shorter than a distance between the drive signal generation circuit and the output connector.

The invention discloses a rapid radiating brake. The rapid radiating brake comprises a brake disc, a brake caliper clamped at the upper end of the brake disc and an air pump, a first connecting pipe is arranged at the output end of the air pump, mounting plates parallel to the brake disc are arranged on the two sides of the brake caliper, avoidance holes concentric with the brake disc are formed in the middle part of the mounting plates, first annular pipes concentric with the brake disc are arranged on the opposite surfaces of the two mounting plates, and the first annular pipes are of hollowstructures. A plurality of air taps with uniformly distributed circle centers are arranged on the opposite end surfaces of the two first annular pipes, the air taps communicate with the interiors ofthe first annular pipes, two first branched pipes further communicate with the first connecting pipe, and the two first branched pipes correspondingly communicate with the interiors of the two first annular pipes. According to the rapid radiating brake, heat on the surface of the brake disc is rapidly dissipated by blowing out a high-speed air flow, the temperature of the brake disc is reduced, and the influence of high temperature on the service life of products is reduced.

The invention discloses a compressor control method of a variable frequency air conditioner of a railway vehicle. During startup and shutdown control, the temperature difference is used as a judgmentcondition, and the total running time or the continuous running time is added as a judgment condition, so that the compressor can be started immediately, capacity output can be performed quickly, thetarget temperature in the passenger room can be reached quickly, and matching of startup and shutdown of the compressor and actual requirements in the passenger room is realized; when the operation frequency is controlled, the duration time is also increased as a judgment condition; the operation frequency of the compressor is continuously adjusted according to the change of the heat load in the passenger room; the output capacity of the air conditioner is optimal; the actual temperature in the passenger room is always stabilized within the range of + / -1 DEG C of the indoor target temperature,so that the phenomenon of passenger room temperature fluctuation caused by frequent opening and closing of the compressor can be reduced, the passenger room is more comfortable and energy-saving, meanwhile, the operation frequency of the compressor is matched with the actual requirement in the passenger room, and the influence on the service life of the compressor is reduced.

The invention relates to a compounding method of an epoxy resin solution with autocatalysis chemical copper plating activity and a chemical copper plating method, and belongs to the technical field of material surface treatment. The compounding method comprises the following steps: adding an activity ion source to an organic solvent under the circumstance of unceasingly stirring, adding a given number of curing catalysts, and sufficiently stirring the activity ion source, the organic solvent and the curing catalysts so as to form a uniform active agent solution; adding epoxy resins to a curing agent according to a certain proportion in a stirring manner so as to form an epoxy resin organic solution; unceasingly stirring the epoxy resin organic solution, and besides, slowly adding the active agent solution to the epoxy resin organic solution so as to form a uniform stable system, namely obtaining a chemical copper plating epoxy resin solution with autocatalysis activity; enabling a compounded resin solution to form a uniform coating on a basal board of a printed circuit board by a casting method or a silk screen printing method, and performing the procedures of solidification, microetch, reduction, chemical plating and the like so as to obtain a plating piece with a bright pink copper plating layer. Through performance test, the copper layer-resin binding force and the electrical conductivity of samples are excellent, and the compounding method and the chemical copper plating method are suitable for a chemical copper plating technology.

The invention belongs to the field of automatic forging, and particularly relates to a centering clamping jaw based on gear and rack driving. The centering clamping jaw based on gear and rack drivingcomprises an air cylinder, a guide rod, a bearing, a gear, a longitudinal rack, a transverse rack, clamping blocks and a positioning block, wherein the clamping blocks are connected to the transverserack; the transverse rack is arranged on the guide rod in a sleeving manner; the transverse rack and the longitudinal rack are arranged in cooperation with the gear; and the longitudinal rack is connected to the air cylinder. When the longitudinal rack moves upwards, the gear is driven to rotate, the transverse rack is driven to move by the gear, the two clamping blocks move away from each other in opposite directions, and at the moment, the clamping jaw is in the expansion state. When the longitudinal rack moves downwards, the gear is driven to rotate, the transverse rack is driven to move bythe gear, the two clamping blocks move toward each other in opposite directions, and at the moment, the clamping jaw is in the clamping state. The clamping jaw is used for converting the reciprocating motion of a power mechanism into the reciprocating motion of the clamping blocks through the gear and rack driving; the positioning block is used for ensuring that the center of a clamped workpieceis always in the same position; and the direct effect of the high temperature environment and a release agent on the air cylinder is avoided.

The invention discloses a method for prolonging the service life of a hot forging die. The die is sequentially subjected to the technologies of forging and pressing, annealing, quenching, tempering and laser cladding. According to the method, the die heat treatment technology and the laser cladding technology are combined, and a brand new die hot forging method is formed; by utilization of the heat treatment technology, forging inner stress is eliminated, grains are refined, and die hardness uniformity is promoted; and by utilization of the laser cladding technology, a cladding layer excellentin abrasion resisting performance is formed, influences of conventional abrasion on the service life of the die are weakened, the service life of the die is prolonged, and the enterprise operating cost is reduced.

The invention provides a large-scale electric vehicle grouped participating in power grid frequency modulation-based control method. The control method comprises the steps of acquiring power grid frequency fluctuation information, network-accessed electric vehicle information and electric vehicle parameter information by a power grid dispatching center; collecting initial time and controllable capacity information of an electric vehicle accessed to a power grid by an electric vehicle control center, and dividing electric vehicles into different subsets; dividing the electric vehicles into a one-way charging group and a frequency modulation group; dividing the electric vehicles into a frequency modulation charging group or a frequency modulation discharging group at the frequency modulationgroup, and limiting conversion frequency of the electric vehicle between a frequency modulation charging group and the frequency modulation discharging group by limiting charge-discharge conversion frequency of the electric vehicle; calculating controllable frequency modulation capacity and total controllable frequency modulation capacity of the electric vehicle of each subset; and dispatching and allocating a frequency modulation task to each electric vehicle according to a capacity proportion according to the forecasted total controllable frequency modulation capacity and a power required by regional power grid frequency modulation, and performing calculation to obtain expected charge / discharge power of the electric vehicle to achieve the purpose of frequency modulation.

The invention discloses a charging method of a lithium ion battery, and the method comprises N charging stages, wherein each charging stages is provided with a corresponding charging rate, a corresponding charging cut-off voltage and a corresponding minimum current. Each charging stage comprises the following steps: carrying out constant-current charging of the lithium ion battery by adopting a preset charging rate until the voltage reaches the charging cut-off voltage of the stage; carrying out the constant-voltage charging by using the charging cut-off voltage until the current reaches the minimum current of the stage; stopping the charging after the N charging stages are repeated. In the N-th charging stage, the charging cut-off voltage is equal to the charging upper limit voltage VB, the minimum current I is equal to 0.05*C0, wherein the C0 is the capacity of the battery cell. By optimizing the stepped charging mode, the charging time of the lithium battery is effectively shortened, and the charging efficiency is improved; in addition, the stepped charging mode provided by the invention reduces the influence on the service life of the battery, so that the service life of the battery is prolonged while the charging efficiency is improved.

The invention discloses a photovoltaic system, a control method of a turn-off device of the photovoltaic system and a switch control device. According to the scheme, after the switch control device ispowered on, the starting time of the turn-off device connected with the switch control device is generated, wherein the generated starting time is longer than the time for tracking the maximum powerpoint of the photovoltaic system; the starting time of the plurality of turn-off devices is different; it is judged whether a control signal is received or not; after the control signal is received and the starting time is passed, the turn-off device at the output end of the photovoltaic module connected with the turn-off device is turned on; and the possibility that the input voltage of the photovoltaic inverter changes suddenly all the time due to the fact that the output voltage of the photovoltaic module reaches an under-voltage protection point is reduced, the influence on the service life of components is reduced, and the stability of a photovoltaic system is improved.

The invention belongs to the technical field of air conditioners, particularly relates to a multi-split air conditioner and a controlling method thereof, and aims at solving the problems of the pipeline complicity of the multi-split air conditioner and potential safety hazards in an existing air conditioner system. The multi-split air conditioner comprises a first outdoor heat exchanging device (matched with a first outdoor unit expansion valve) and a second outdoor heat exchanging device (matched with a second outdoor unit expansion valve) which are parallelly arranged, a first cold medium circulating loop which is composed of a compressor, a four-way valve, the first outdoor heat exchanging device, the first outdoor unit expansion valve and any of indoor unit and a second cold medium circulating loop which is composed of a compressor, a four-way valve, the second indoor heat exchanging device, the second outdoor unit expansion valve and any indoor unit. The first cold medium circulating loop and the second cold medium circulating loop can be switched off / on by the first outdoor unit expansion valve and the second outdoor unit expansion valve. The multi-split air conditioner has the advantages that complicated pipeline designing is avoided, the cold medium leakage risk is greatly reduced, and the production cost is further reduced.

The invention discloses a highly integrated high light efficiency thermoelectric separation power type light emitting diode (LED). The LED comprises a paster type bracket, an LED chip and gold threads, wherein a concave cup is formed on the upper surface of the bracket, electric conducting channels which are independently communicated into two sides of the concave cup are arranged at left and right sides of the bracket, the bottom surface of the bracket is provided with a heat conducting channel of which the middle part is communicated to the middle part of the concave cup, the LED chip is stuck with the heat conducting channel through heat conducting insulation paste, two poles of the LED chip are respectively electrically connected with the electric conducting channel through the gold threads, and a fluorescent colloid which is formed by mixing silica gel and fluorescent powder is filled and sealed in the concave cup. Because of the design of thermoelectric separation, heat dissipated when the LED chip works can be independently conducted to a heat dissipating pillar in time, and the impacts of heat on the reliability of second spot welding and the service life of the chip are reduced. With the design of polycrystal serial and parallel integration and thermoelectric separation, the LED disclosed by the invention has the technical effects of high light efficiency, independent heat and electric channels, simple structure, good heat dissipation effect and the like.

The invention discloses a treatment method of oxygen reduction and stopping of a blast furnace in heavy-load and high oxygen enriched smelting. The method is a blast furnace operation method mainly applied to heavy-load (coke load ranging from 5.30 to 5.95), high oxygen-enriched (oxygen enriching rate ranging from 5.0% to 6.0%), high coal ratio (coal ratio ranging from 155 kg / t to 205 kg / t) smelting condition after high oxygen reduction (oxygen enriching rate is decreased by more than 50%). The method mainly comprises the following steps: controlling blast humidity, blast temperature and blastquantity of a blast furnace in case of high oxygen reduction during smelting under a high oxygen enriching condition; controlling coke load and smelting intensity; controlling the coal injecting quantity of the blast furnace; controlling the furnace temperature and the gas flow distribution in the furnace. With the adoption of the operation method, the influence of high oxygen reduction on blastfurnace smelting can be effectively reduced; the blast furnace output loss can be decreased, and the influence of the furnace condition fluctuation on the service life of a blast furnace body device can be reduced.

The invention provides a fuel cell air circuit. The fuel cell air circuit comprises a fuel cell stack, an air compressor arranged on the intake pipe of the fuel cell stack, and a pumping device whichis arranged on the exhaust pipe of the fuel cell stack. The pumping device is used for extracting gas in the fuel cell stack. According to the invention, the pumping device is arranged on the exhaustpipe of the fuel cell stack; when the air compressor has a surge phenomenon, unreacted gas in the fuel cell stack can be discharged in time by turning on the pumping device; gas flow resistance and pressure drop in the fuel cell stack are reduced; the surge of the air compressor is prevented; normal operation of a fuel cell engine is ensured; and the impact of surge on the service life of the aircompressor is reduced. The embodiment of the invention further discloses a pumping device control method and a controller.

The invention discloses a double-laser head dust detection method. Two laser heads are employed alternately to emit laser to one detection area, the laser scattered after being emitted to dust is captured through a photoelectric receiver, and the laser passing through the detection area is reflected to other directions except for the detection area through reflecting surfaces. The invention also discloses a double-laser head dust detection sensor, the sensor includes a box internally equipped with the corresponding laser heads and the photoelectric receiver, the number of the laser heads is two, and the number of the photoelectric receiver is one, the box is internally provided with a detection area, and the photoelectric receiver is located on one side of the detection area. The box is internally provided with a circuit board connected to the laser heads and the photoelectric receiver, and is also equipped with the reflecting surfaces. According to the double-laser head dust detection method and sensor provided by the invention, the two laser heads are used alternately, the service life of the laser head combination can reach 30 thousand to 40 thousand hours, and the lifetime is greatly improved.

The invention discloses a hub bearing flange plate multi-station precision forming technology and an implement device thereof. A blank is sequentially subjected to independent technologies including cutting blanking, upsetting, rod part forward extrusion, combined extrusion, forming and punching through a multi-station forming mold, and the optimizing forming of hub bearing flange plates is realized. According to the hub bearing flange plate multi-station precision forming technology and the implement device thereof, the blank plastic forming process is subjected to optimizing material allotment through the multi-station forming, and on the basis, upper mold and lower mold guide structural design, closed type forming technology design and a design technology combining nitrogen spring pressing with ejection are added, and the problems of low precision and many waste materials in the forming process are solved.