33results about How to "Eliminate instability" patented technology

The invention provides a multi-hole stopper rod for continuous casting. The multi-hole stopper rod for continuous casting comprises a stopper rod body and a stopper rod head which is connected to the bottom of the stopper rod body, an argon passage is arranged in the stopper rod body, the argon passage extends to the internal part of the stopper rod head, gas guide holes are horizontally formed in the stopper rod head, the gas guide holes are perpendicular to the axis of the argon passage, and the gas guide holes are formed above the contact surface between a gate and the stopper rod head and are communicated with the argon passage. Compared with the prior art, the multi-hole stopper rod for continuous casting has the advantages that the impurity products at the contact part between the gate and the stopper rod head can be very well cleaned, the flow rate of molten steel can be more accurately controlled, the bias flowing of the molten steel in the gate and the unstable state of vortexes are reduced, and the overall efficiency of continuous casting and the quality of the molten steel are improved.

The invention discloses an electric power steering system and a control method. The electric power steering system comprises a collector, a processor, a fuzzy PID controller and a motor, wherein the collector is used for collecting manual torque applied to a steering wheel and the current speed of the vehicle; the processor is connected with the collector for receiving the manual torque and the speed, acquiring expected target steering torque applying to the steering mechanism after the motor is power-on according to the manual torque, the speed and the preset steering control strategy, and further acquiring target current needed when the motor outputs the target steering torque; the fuzzy PID controller is connected with the output end of the processor for receiving the target current and the present current of the motor, adopting fuzzy PID control algorithm to adjust the output current of the fuzzy PID controller according to the target current and the present current of the motor until the present current is the same as the target current; and the motor is used for controlling the steering mechanism according to the output current of the fuzzy PID controller. Accuracy and stability of the electric power steering system are enhanced.

The invention discloses waterproof crack-resistant foam concrete and a manufacture method thereof. The waterproof crack-resistant foam concrete is formed by mixing and stirring of raw materials including, by weight, 220-350 parts of cement, 90-180 parts of microspheres, 1-6 parts of elastic particles, 0.30-0.45 parts of palm filaments, 60-160 parts of water, 2-9 parts of waterproof admixtures and foam. The waterproof crack-resistant foam concrete and the manufacture method thereof have the advantages that the raw materials such as industrial by-products, tailings powder or waste rubber powder and the palm filaments are adopted, and the multi-scale toughening principle on compounding of the elastic particles and fibers is followed, so that strength and crack resistance of the foam concrete are improved, and waste resource utilization is benefited; the adopted waterproof admixtures are highly compatible with other materials, and accordingly, water resistance and durability of the foam concrete are improved effectively; by the prepared foam which is fine, uniform and high in stability, anti-permeability and thermal performance of the foam concrete are improved; the foam concrete is applicable to heat insulation of building walls and roofs and roadbed refilling materials for highways in regions with soft soil and high water level.

The invention discloses a method and a device for measuring turbidity, related to the turbidity detection technology. The method comprises the steps of irradiating an environment to be detected by using a beam of parallel light, and detecting 90-degree scattered light power in a plurality of positions in the light path of the parallel light, thus obtaining the turbidity value of the environment to be detected by performing mathematic processing on the detected value. The measuring device of the method is packaged in the form of a probe and comprises a housing, a parallel light emitting system, a photoelectric receiving system and a signal processing circuit. The light path structure is capable of satisfying 90-degree scattering detection under any condition and the volume of the device can be reduced. The method and the device provided in the invention eliminate the influence of the unstability of a light source on the measurement, reduce the interference of temperature errors and window pollution to the turbidity measurement, extend the cycle of manual cleaning and maintenance and improve the measurement accuracy. The measuring device is small in volume, low in power consumption, high in sensitivity and good in anti-jamming capability; and the device follows ISO7027 standards, and is convenient for mounting and adjustment and applicable to turbidity measurement and intelligent monitoring of various environments.

The invention discloses a distributed optical fiber sensing system, which comprises a narrow linewidth laser, a modulator, an optical isolator, an erbium-doped optical fiber amplifier, a circulator, an optical fiber grating, a sensing optical fiber, an optical detector, a microwave amplifier, a high pass filter, a power distributor, a first filter module, a first microwave detection module, a first low-frequency amplifier, a second filter module, a second microwave detection module, a second low-frequency amplifier, a data acquisition card and a computer. Distributed optical fiber vibration or sound signal measurement is realized, dynamic large-phase signal measurement is effectively realized, a phase cancellation and fading problem can be eliminated, a high-speed data acquisition device with a GS / s sampling rate is not needed, the cost is reduced, the response time is not influenced, the strength and the frequency shift changes of Brillouin scattering light can be measured respectively on the premise of eliminating instability of a laser source and line loss, and temperature changes and the strain are further obtained.

The invention relates to a lumbar spondylolysis restoration internal fixation system, comprising a pedicle screw implanted into pedicle and a vertebral plate hook hooking the lower edge of a vertebral plate; the pedicle screw is connected with the vertebral plate hook by a cylindrical connecting rod; the head part of the pedicle screw is provided with a U-type groove; the connecting rod can be arranged in the U-type groove in a sliding manner; the top part of the U-type groove is provided with internal threads; the U-type groove is connected with a plug screw which is used for fixing the connecting rod; the vertebral plate hook is fixedly connected to the connecting rod by a locking plate; the vertebral plate hook is positioned at the end, which is far from the pedicle screw, of the connecting rod; the locking plate is an expanded part at the tail end of the connecting rod; the vertebral plate hook, the locking plate and the connecting rod are integrated to form a repository; and the locking plate is fixed on the vertebral plate by locking screws and is provided with locking holes matched with the locking screws. The invention has the advantages of elimination of tender moving of the vertebral plate after operation, high positioning precision of screws, simple and convenient operation, reservation of lumbar motion segment and high fusion rate of fracture end after operation.

The invention discloses an optical fiber Bragg grating refractive index sensor which comprises a broadband light source (1), an optical fiber coupler (2), a transmission optical fiber (3), an optical fiber sensing head (4) and a spectrograph (5), wherein the broadband light source (1) is connected to an input end of the optical fiber coupler (2), one output end of the optical fiber coupler (2) is connected with the optical fiber sensing head (4) through the transmission optical fiber (3), and the other output end of the optical fiber coupler (2) is connected with the spectrograph (5); light reflected by the optical fiber sensing head (4) is transmitted to the spectrograph (5) through the optical fiber coupler (2), and the spectrograph (5) is communicated with a computer (6); and the optical fiber sensing head (4) is a common optical fiber Bragg grating with a tail fiber. The sensor can be used for measuring refractive indexes and simultaneously measuring the refractive indexes and temperature, and has the advantages of real-time online and remoter detection capability, large measurement range, high sensitivity, strong stability and convenient operation.

The invention discloses a water gauge. The water meter comprises a gauge outfit, a flux tube and an ultrasonic transducer. A transduction hole is formed in the flux tube, and the ultrasonic transducer is installed in the transduction hole. The gauge outfit is installed on the flux tube. The ultrasonic transducer is connected with the gauge outfit. A flow-splitting reflector is installed inside the flux tube and arranged corresponding to the ultrasonic transducer. The flow-splitting reflector comprises a splitter plate, and one end of the splitter plate is connected with an acoustic beam reflecting plate in an inclined mode. The ultrasonic transducer corresponds to the acoustic beam reflecting plate, and an acoustic beam emitted by the ultrasonic transducer is reflected on the acoustic beam reflecting plate. By the adoption of the water gauge, water flow in the flux tube can be split and neatened, the unstable state of the water flow is eliminated, differences in flow rates at all points of the same section are reduced, and therefore the accuracy of flow measurement is improved.

The invention discloses a laser switching-off system with high damage resistance. The system comprises a deflection control system, a mirror and an absorber located on the optical path of the mirror, wherein the deflection control system controls the mirror to move in or out of a laser optical path in a rotary mode, the absorber is of a hollow cylinder structure, one end of the absorber is closed, the other end of the absorber is a laser inlet end, a protruding cone is arranged at the bottom end of the interior of the closed end, a light beam divergence element is fixed to the laser inlet end to enable inlet laser to be diverged in advance, a cooler is formed by the surface of the light beam divergence element, the inner side wall of the hollow cylinder body and the surface of the cone, and cooling water is injected into the cooler to cool the light beam divergence element, the inner side wall of the hollow cylinder body and the surface of the cone.

The present invention relates to a process and an apparatus for controlling the continuous and stable discharge of non-condensable gas in a benzene recovery system. According to the process, benzene steam produced from the top of a benzene removing tower enters a condensation cooler to be cooled by a low-grade cold source and a high-grade cold source in a segment manner so as to obtain a benzene-water mixture; the benzene-water mixture enters a gas-liquid mass transfer and heat transfer device in a self-flow manner and flows toward a benzene-water separator on the lower portion, the gas phase in the condensation cooler enters the benzene-water separator and flows toward the gas-liquid mass transfer and heat transfer device on the upper portion, and the pressure in the system is controlled at -80-45 kPa; and in the gas-liquid mass transfer and heat transfer device, the gas phase and the liquid phase are subjected to countercurrent contact, the high-boiling point organic component in the gas phase is condensed, the condensed component enters the benzene-water separator, the non-condensable gas is cooled, and the cooled gas is continuously and stably discharged from the top portion. With the process and the apparatus of the present invention, the non-condensable gas in the benzene recovery system can be continuously and stably discharged, such that the crude (light) benzene quality and the yield can be ensured while the instability factor of the benzene removing tower operation can be eliminated, and the safety of the benzene recovery system can be improved; and the process is simple, the equipment layout is compact and rational, and the installation and the maintenance are convenient.

When rotating with fixed end-side axis parts (43, 53) set as rotational axis fulcrums, rotating end-side axis parts (45, 55) of a forward link (41) and a rear link (51) move in an up-down direction. The range of rotation of the forward link (41) is arranged in a manner such that the rotating end-side axis part (45) of the forward link (41) is always above a rotation center joining line (L). The range of rotation of the rear link (51) is arranged in a manner such that the rotating end-side axis part (55) of the rear link (51) is in a range that straddles the rotation center joining line (L). As a result, the rotating end-side axis part (45) of the forward link (41) is lowered, and only the rotating end-side axis part (55) of the rear link (51) is raised, until the point where a rotating end joining line (M) switches from a below-side position to an above-side position relative to the fixed end-side axis part (53) of the rear link (51). Hence, it is possible to effectively lift a seat cushion upward when a passenger gets in or out of a vehicle, in a manner such that the position of the hips of the passenger are higher relative to the position of the knees of the passenger.

The invention discloses a novel floor heating laying structure, a temperature control system and a temperature control method and relates to the technical field of indoor heating. The novel floor heating laying structure comprises a radiation pipeline and at least one branched pipe, wherein the radiation pipeline is communicated with a user main pipeline, enters a heating area, bypasses along the heating boundary by a circle and is educed; the radiation pipeline comprises an incoming water distributing pipe for hot water to inflow and a return water collecting pipe for the hot water to outflow; the at least one branched pipe comprises a water inlet end and a water outlet end; each water inlet end is communicated with the incoming water distributing pipe; each water outlet end is communicated with the return water collecting pipe. Compared with a single pipeline bent laying structure in the prior art, the novel floor heating laying structure in the scheme has the advantages that a plurality of branched pipes are connected between the incoming water distributing pipe and the return water collecting pipe in parallel, so that a plurality of branched waterways communicated with the incoming water distributing pipe and the return water collecting pipe are added. When certain section is blocked by water scales or cannot smoothly flow, a plurality of branched waterways still can normally work, so that the flow rate and the heat-transfer capability of the hot water are ensured and the energy utilization rate and the heating effect are improved.

The invention discloses an anti-falling device modified from a middle support. The anti-falling device is structurally formed by connecting a shared rear wheel brake handle, an additionally-arranged pull wire, a newly-added pull wire fixing frame and the modified middle support in a matched mode. The outer side of the rear wheel brake handle is connected with a traction arm and the other section of drum head positioning plate, the lower portion of a bottom beam of an electric vehicle is connected with the fixing frame, the pull wire is connected between the other section of drum head positioning plate and the fixing frame, and the pull wire and the shared rear wheel brake handle form a linkage mechanism after the pull wire is connected with the middle support through a triangular rope. When a rear wheel brakes abruptly, the traction arm is driven by the shared rear wheel brake handle to pull the middle support to rotate downwards through the pull wire and the triangular rope to form inclination, two trundles arranged below the middle support are grounded synchronously due to the fact that the middle support inclines downwards, and the two grounded trundles play a role in supportingbalance during emergency braking of the vehicle body.

The invention discloses an acrylonitrile-butadiene-styrene composition for realizing spray coating flowing mark avoidance and a preparation method thereof. The composition is prepared from 82 to 97.25parts of acrylonitrile-butadiene-styrene resin, 0.5 to 2 parts of light stabilizing agents, 0.1 to 2 parts of heat stabilizing agents, 2 to 10 parts of chemical treatment agents, 0.1 to 2 parts of processing auxiliary agents and 0.05 to 2 parts of metal powder pigments. A novel idea technical route solution is creatively provided in a material aspect. A workpiece produced by the acrylonitrile-butadiene-styrene composition with the spray coating avoiding metal effect through injection molding processing has the advantages that flowing mark flaw defects of the workpieces on the appearance can be completely eliminated; the product appearance quality is greatly improved; the injection molding unqualified product rate is reduced; the considerable benefits are provided for production.

The invention provides a method for determining urine arsenic by an electrochemical hydrogenation generation-atomic fluorescence spectrum combining technology. The method specifically comprises the following steps: (1) pretreating a sample; (2) preparing a standard curve; (3) judging precision and accuracy; and (4) calculating an arsenic content in urine. Compared with an existing method, the method has the advantages that use of sodium borohydride is reduced, meanwhile, a CdSO4 solution is added into a catholyte, and reduction efficiency of As is effectively improved. The method is small in reagent use amount, environmentally friendly and high in hydrogenation reduction efficiency, reagent losses can be reduced, economic benefits can be improved, and the method can be simultaneously suitable for detecting arsenic in large-batch urine and detecting low, proper and high arsenic concentrations in urine samples.

The invention discloses an anti-cavitation centrifugal pump and a manufacturing method thereof. The device comprises a pump housing, an impeller and an induction wheel; the impeller is arranged in thepump housing; the pump housing is provided with a water inlet sleeve; and the induction wheel is arranged in the water inlet sleeve. The device further comprises a support ring; the support ring is provided with a guide member; the water inlet sleeve is provided with a groove; the support ring is arranged in the groove; the water inlet sleeve is in threaded connection to a clamping ring; a retainer ring is arranged on the support ring; and the retainer ring is clamped by the clamping ring. The manufacturing method manufactures the centrifugal pump by adopting eight steps of (a) machining preparation, (b) machining of the guide member, (c) machining of the pump housing, (d) assembly of a pump body, (e) machining of the water inlet sleeve, (f) mounting of the guide member, (g) total assembly and (h) testing. As the water inlet sleeve is provided with the guide member, the flow field of the water inlet sleeve can be uniform, the reflux region is reduced, the instable state induced by rotary cavitation is effectively reduced, the stable operation of the pump body is guaranteed, the manufacturing steps are optimized, the steps are simple, the manufacturing efficiency is high, and the implementation is easy.

The invention discloses a synchronous control method and system for the rotating speeds of coaxial dual motors. The method is used for controlling left and right wheel end motors for respectively driving two coaxial wheels. The left and right wheel end motors respectively and synchronously execute the following steps: acquiring the current respective states of the wheel end motors according to the actual rotating speeds of the motors and the expected rotating speeds of the motors; updating target motor rotating speeds of the wheel end motors according to the current state of the wheel end motors and a required rotating speed slope value; and judging whether the target motor rotating speed exceeds a motor rotating speed limit value or not, and if so, responding to the motor rotating speed limit value, otherwise, performing torque arbitration output.

The invention discloses a diffuse reflection type double-light-path air vibration detection system, which performs differential detection on two points close to each other in a double-light-beam modeby utilizing a basic principle that pushing deformation is formed on the surface of a flexible object and time difference (phase difference) exists at different positions in an air vibration process of a detection area. The approximate time derivative of the vibration is obtained, the detection of the differential property of the vibration displacement is realized, the original signal is recoveredby using an integral mode, and the waveform of the original air vibration is effectively reduced; a series of interference factors such as instability of a light source and interference in the lightpropagation process are eliminated in a double-beam mode, and efficient and stable detection of air vibration is achieved.

A pedal type anti-falling device of a two-wheeled electric vehicle is structurally formed by connecting a right pedal, a pedal shaft head, a shaft head positioning plate, a large sector gear, a smallsector gear, trundles, a damper and a middle support in a matched mode. The shaft head positioning plate is connected with the lower portion of a bottom beam of the electric vehicle, one end of the pedal shaft head is connected with the shaft head positioning plate, and the right pedal is installed in an formed through groove. The manufactured large sector gear and the manufactured small sector gear are connected with a lug plate of the middle support and the pedal shaft head respectively, the large sector gear can rotate upwards by treading the right pedal downwards, and therefore the meshedsmall sector gear is driven to rotate reversely to drive two trundles below the middle support to make contact with the ground; the phenomenon of transverse slipping and tumbling of a rear wheel during emergency braking is fundamentally eliminated; and in addition, the vehicle can be supported by the middle support in a more labor-saving and easy-to-use manner.

The invention provides a thin billet plate fast-to-replace submerged nozzle, which comprises a nozzle body and a water outlet formed in the bottom of the nozzle body, wherein the nozzle body comprises a linear section arranged at the upper end and a horn section connected with the linear section, the upper end of the barrel diameter of the horn section is greater than the lower end of the barrel diameter of the horn section, in addition, the smooth transition is realized from the top to the bottom, and the water outlet is in a flat shape. Compared with the prior art, the thin billet plate fast-to-replace submerged nozzle has the advantages that the thin billet plate fast-to-replace submerged nozzle is applicable to the thin plate billet continuous casting of narrow crystallizers so that steel flow has better stability inside the nozzle and at the outlet part of the nozzle, molten steel can reasonably flow in the crystallizer, and the unstable state of the liquid level of the molten steel is reduced, so the quality of a steel billet is improved, better shock-resistant performance is realized, the service life of the submerged nozzle is prolonged, and the risk of casting interruption is reduced.

The invention discloses an acrylonitrile-butadiene-styrene composition for solving spray-free flow marks and a preparation method thereof. The composition includes acrylonitrile-butadiene-styrene resin: 82-97.25 parts, light stabilizer : 0.5-2 parts, heat stabilizer: 0.1-2 parts, chemical treatment agent: 2-10 parts, processing aid: 0.1-2 parts, metal powder pigment: 0.05-2 parts. This invention creatively provides a solution of a new idea and technical route in terms of materials. The spray-free metal effect acrylonitrile-butadiene-styrene composition of the invention is used for parts produced by injection molding, which completely eliminates the The flow mark defects on the appearance of the parts greatly improve the appearance quality of the product, reduce the rate of defective injection molding products, and bring considerable benefits to production.

The invention discloses a multipath signal transmission method and system for magnetic resonance imaging. According to the method, one data line and one clock line are adopted to transmit gain of all receiving channels, so that the sending and receiving of digital gain are achieved. The system provided by the invention comprises a spectrometer control unit and a controllable gain pre-amplifier, which are connected mutually through one data line and one clock line, wherein the spectrometer control unit comprises a gain data merging and parallel-serial conversion circuit and a bus driving circuit, which are connected mutually; the controllable gain pre-amplifier comprises a shaping circuit and a gain data serial-parallel conversion and separation circuit, which are connected mutually. The multipath signal transmission method and system have the advantages as follows: the quantity of spectrometer cables and the volume of a spectrometer are reduced greatly, the difficulty of mounting the spectrometer is reduced, the reliability and capacity of resisting disturbance of gain transmission are greatly improved, the unstable state in the process of changing gain is eliminated, the application ranges of the multipath signal transmission method and system provided by the invention are wide, and relatively strong practical value and practical significance are achieved.

The invention discloses a gas control method for a circular seam of a bottom spray gun of a bottom oxygen blowing and bottom powder spraying converter. Flow control or pressure control is adopted in the method. Flow control is adopted when the pressure of the circular seam ranges from 0.7 MPa to 1.7 MPa, and pressure control is adopted when the pressure of the circular seam is smaller than 0.7 MPa or larger than 1.7 MPa; the total circular seam flow of the natural gas of the bottom spray gun is 12-42 Nm < 3 > / min, and the set circular seam flow of a single branch pipe is 2-7 Nm < 3 > / min; according to the flow control process, (1.1) the pressure of the circular seam is increased along with the increase of the mushroom head, and when the pressure of the circular seam of any branch pipe reaches 1.1 KMa to 1.3 KMa, the flow of the circular seam of the branch pipe is reduced by 0.4 Nm < 3 > / min to 0.8 Nm < 3 > / min; (1.2) when the pressure of the circular seam of any branch pipe is larger than 1.3 KMa, the flow of the circular seam of the branch pipe is reduced by 0.8 Nm < 3 > / min to 1.2 Nm < 3 > / min; and (1.3) the pressure of the circular seam of the branch pipe in the step (1.1) or (1.2) is not reduced to 1.3 or below, and the flow of the circular seam of the branch pipe is maintained at the flow of the circular seam. According to the method, the service life of the bottom spray gun is prolonged, production accidents are avoided, and smooth production is guaranteed.

The invention provides a light energy-saving pan which comprises a pan body, wherein the pan body comprises a flat bottom and a pan body, wherein circumferentially distributed convex strips are fixedly connected to an outer periphery of a bottom surface of the flat bottom; the quantity of the convex strips is greater than or equal to 3; the convex strips extend along an edge of the flat bottom; alongitudinal section of each convex strip is circular arc-shaped; a circular bar is arranged on an outer facade of the pan body close to the flat bottom; the circular bar surrounds the pan body; a plane where the annular bar is located is parallel to the flat bottom; a connection line between a center of a circle of the annular bar and the center of the circle of the flat bottom is perpendicular to the flat bottom; the circular bar at least comprises a concave bar and a convex bar; a groove is formed in the bottom surface of the flat bottom; the groove comprises a first groove, a second groove, a third groove, a fourth groove and a fifth groove which are sequentially arranged from the center of the flat bottom to positions close to the outer periphery of the flat bottom. The light energy-saving pan provided by the invention has advantages of reasonable structural design, light weight, energy saving and high safety.

A process and machine configured to predict and preempt an undesired load and / or bending moment on a part of a vehicle resulting from an exogenous or a control input. The machine may include a predictor with an algorithm for converting parameters from a state sensed upwind from the part into an estimated normal load on the part and a prediction, for a future time, of a normal load scaled for a weight of the aerospace vehicle. The machine may: produce, using a state upwind from the part on the aerospace vehicle and / or a maneuver input, a predicted state, load and bending moment on the part at a time in the future; derive a command preempting the part from experiencing the predicted load and bending moment; and actuate the command just prior to the part experiencing the predicted state, thereby alleviating the part from experiencing the predicted load and bending moment.

The invention discloses a cavitation-resistant centrifugal pump and a manufacturing method thereof. The device includes a pump casing, an impeller and an inducer, the impeller is arranged in the pump casing, the pump casing is provided with a water inlet jacket, and the inducer is arranged in the water inlet jacket , also includes a support ring, the support ring is provided with deflectors, the water inlet sleeve is provided with a groove, the support ring is set in the groove, the water inlet sleeve is threadedly connected with a clamping ring, the support ring is provided with a clamp ring, and the clamping ring Snap the collar tightly. The manufacturing method adopts a. processing preparation; b. deflector processing; c. pump casing processing; d. assembly of pump body; e. processing of water inlet sleeve; f. deflector installation; g. overall assembly; h. Eight steps to test the manufacture of centrifugal pumps. The invention can make the flow field of the water inlet jacket uniform, reduce the backflow area, effectively reduce the unstable state induced by the rotating cavitation, ensure the stable operation of the pump body, and optimize the manufacturing steps with simple steps by setting the deflector on the water inlet jacket , high manufacturing efficiency and easy implementation.

The invention is applicable to the field of graph data processing, provides a deep attention embedded graph clustering method with a smooth structure, and provides a novel graph clustering method which can effectively eliminate instability of a reconstructed graph structure by simultaneously applying an attention mechanism and a smooth constraint on a graph self-encoding network. The invention further provides a self-optimization clustering module, and the problem of performance degradation caused by target distribution updating is effectively solved.