366results about How to "Small hysteresis" patented technology

The invention belongs to the ultraprecision machining field of the hard and brittle semiconductor crystalline materials and relates to a grinding force on-line measurement device used in the grinding process of the semiconductor wafer and a force-controlling grinding method. The invention discloses a semiconductor wafer grinding force on-line measurement device which is used as the feedback element of a grinding force adaptive control system. The grinding force measurement device adopts the piezoelectric measuring principle and contains a sensor part and a data processing unit, wherein the sensor part is used for the on-line measurement of the radial force Fr, the tangential force Ft and the axial force Fz; and the data processing unit is used to collect and analyze the grinding force data and perform feedback control to the feed speed and feed amount of the grinding wheel, thus the aim of on-line measurement can be achieved. The invention has the following advantages: the grinding force on-line measurement device has simple structure, and the modifications to the original equipment are less; the grinding force on-line measurement links are fewer, the response speed is fast, and the precision is high; and the grinding efficiency of the semiconductor wafer can be increased and the thickness of the damaged layer is reduced.

The invention discloses a precision cycloidal-pin wheel planetary transmission device which comprises a machine base, a power input shaft, an eccentric bushing provided with two off centers, a cycloidal wheel I, a cycloidal wheel II, a dowel pin for cycloidal wheels, a power output shaft, a wheel spider I, a wheel spider II and two sets of pin gears that are respectively arranged on the wheel spider I and the wheel spider II; one end of the dowel pin for cycloidal wheels is fixedly arranged on a flange of the power output shaft and the other end is inserted into an isotonic pin hole of the cycloidal wheel I and the cycloidal wheel II to form a pin type output mechanism; the direction of a tooth outline on which the cycloidal wheel I and a pin gear I are meshed and the direction of a tooth outline on which the cycloidal wheel II and a pin gear II are meshed are reverse. The precision cycloidal-pin wheel planetary transmission device of the invention can eliminate or reduce tooth clearance during the transmission process, thereby improving transmission efficiency, reducing vibration and noise and prolonging service life; the relative position of the two wheel spiders in a circumferential direction is adjustable, so that meshed gap and return difference can be controlled effectively and more options are available when shaping the tooth outline of the teeth of the cycloidal wheels.

A rotary joint structure for the underwater electric manipulator is composed of a static casing with end cover, a movable casing with end cover, a transition part between said static and movable casings, a central axle passing through said first three, and such units on said central axle as brake, torque motor module, harmonic speed reducer module, rotary encoder and fastening nuts.

The invention discloses a simulation and optimization system of a flue gas desulfurization process of a thermal power plant. The simulation and optimization system is composed of a server and a client. A limestone-gypsum wet fuel gas desulfurization model is firstly established to realize simulation of the desulfurization process; and a multi-objective normalized optimization method is used for optimizing and simulating artificially set work conditions so as to sieve an optimal operating condition under each work condition and package the optimal operating condition as an optimized operation database. The server monitors a real-time data document of a DCS (Distributed Control System) sent by an SIS (Supervisory Information System) database, finds matched records in the optimized operation database via a way of database retrieval and then sends the real-time data and relevant advices to the client for a user to check. The server and the client realize connection and user management through an LAN (Local Area Network). The simulation and optimization system, disclosed by the invention, has the advantages of providing an optimization control platform for the desulfurization system of the thermal power plant, providing optimized operation advices and early warnings for operators without directly operating the DCS system and thereby improving normal running rate, desulfurization efficiency and SO2 discharge concentration attainment rate of the desulfurization system.

The invention provides a multi-joint robot, which comprises a large arm, a small arm, a movement unit and a gripper, wherein the large arm and the small arm are horizontally arranged and are mutually hinged, the movement unit is arranged on the small arm and comprises a lifting mechanism, and the gripper is used for gripping parts, is arranged on the lifting mechanism and can make lifting movement along with the lifting mechanism. The multi-joint robot is small and exquisite and flexible in tail end, compact in structure and good in control performance.

The invention relates to the manufacture technical field of polysilicon ingot furnaces, and aims to provide a closed cooling system of a gas cooled polysilicon ingot furnace. The system comprises a heat exchange platform positioned on a supporting column and used for placing a crucible, wherein a cooling gas channel is arranged in the heat exchange platform; a gas inlet and a gas outlet at two ends of the cooling gas channel are respectively connected with a cooling gas inlet pipeline and a cooling gas outlet pipeline; and the heat exchange platform, the cooling gas inlet pipeline, the cooling gas outlet pipeline, a cooling gas power pump group and a cooler form a closed circulation loop of the cooling gas. Compared with the cooling method of radiation cooling and water cooling, the system related by the invention has strong gas cooling control capacity and high industrial controllability; the gas is fed into the heat exchange platform evenly, so that the whole temperature of the heatexchange platform is even, which is in favor of even nucleation of a silicon melt at the bottom of the crucible; and the reducing speed of the temperature at the bottom of the crucible can be precisely controlled during the crystal growth.

The invention discloses a high voltage resistant permanent magnet polarized two-way proportional electromagnet, belonging to an electromechanical switching mechanism, adopting a special design: using yoke iron and guide sleeve to compose a two-way basin-like pole piece structure, there is permanent magnet mounted in the guide sleeve, there are control coils installed on two sides of the permanent magnet, a polarized magnetic field generated by the permanent magnet is superposed with control magnetic fields generated by the control coils so as to obtain an output force on an armature proportional to input signal, two-way and continuous, thus achieving a good proportional control characteristic; it has low energy consumption, eliminates 'zero'dead zone, has good static and dynamic properties. Therefore, it can be widely applied to proportional valve and servo valve.

The invention relates to the technical field of capacitive pressure sensors, in particular to a flexible capacitive pressure sensor and a preparation method thereof. The sensor comprises a top electrode, a bottom electrode, composite material dielectric layers and a wire, wherein the top electrode and the bottom electrode are each composed of a substrate of which the surface is provided with a conductive polymer layer; the wire extending to the outsides of the conductive polymer layers is embedded in the conductive polymer layers; the composite material dielectric layers are arranged on the surfaces of the conductive polymer layers on the top electrode and the bottom electrode; the flexible capacitive pressure sensor is formed by combining the surfaces, provided with composite material dielectric layers, of the top electrode and the bottom electrode in a face-to-face mode. The prepared high-performance flexible capacitive pressure sensor is high in sensitivity, small in hysteresis andgood in repeatability, the preparation cost is low, the method is simple, large-scale production can be achieved, and the sensor can be widely applied to the fields of a human-computer interaction system, a detection sensor system, medical health detection equipment and the like.

The invention discloses a charging and blanking robot of a punch press, comprising four joints, a base, two arms and an end effector, wherein the first joint, the second joint and the fourth joint have the degree of freedom of rotation, and the third joint has the degree of freedom of up and down translation; one end of the first joint is connected with the base by an input end shell; the other end of the first joint is connected with one end of the first arm by a first joint output flange; the other end of the first arm is connected with a second joint output flange of the second joint; a third joint connecting plate is connected with the joint rack of the fourth joint; and a fourth joint output rotary table is provided with the end effector. A harmonic transmission mode is adopted by a first joint transmission device and a second joint transmission device of the robot. Aiming at the characteristic that a harmonic speed reducer only can bear torque but can not bear bending moment, a pair of tapered roller bearings is arranged on an output shaft and is used for bearing overturning bending moment. The transmission mode has compact structure, high transmission efficiency, small return difference and high transmission accuracy.

Disclosed is a carbon nanotube composite comprising a carbon nanotube. A conjugated polymer comprising repeating units containing a condensed heteroaryl unit having a nitrogen-containing double bond in the ring and a thiophene unit has been attached to at least a part of the surface of the carbon nanotube. The carbon nanotube composite can reduce the hysteresis of a field-effect transistor comprising a semiconductor layer containing a carbon nanotube.

The invention discloses a design and manufacture technology of a sensing unit of a sensor and one or more types of sensor chips consisting of the sensing unit, in particular to one or more types of sensor chips capable of detecting the magnetic field parallel and vertical to the surface of the chip and the acceleration of an object. The invention has the advantages that the process is simple and easy, the sensitivity is high, and batched production is easily realized; the sensing unit of the sensor comprises a wafer substrate, a seed layer, a soft magnetic material layer, a conducting layer and a N-layer structure; the conducting layer is wrapped by the soft magnetic material layer; the N-layer structure is formed by combination of the soft magnetic material layer and the conducting layer; and simultaneously a bent structure is formed by N long lines in the plane (the sensing unit is a single-strip-shaped structure when N is equal to 1). The sensing unit of the sensor realizes single-axis, double-axis and three-axis magnetic field detection by different packaging forms. Simultaneously, due to the combination of the sensing unit of the sensor and a cantilever structure with magnetic mass blocks, the single-axis, double-axis and three-axis acceleration detection can be realized.

The invention discloses a polyelectrolyte and graphene composite resistive moisture sensor and a manufacturing method thereof. The polyelectrolyte and graphene composite resistive moisture sensor uses a ceramic as a substrate on which a plurality of pairs of interdigital gold electrodes are arranged; a moisture sensitive film is coated on the ceramic substrate and the interdigital gold electrode surfaces, the moisture sensitive film is a polyelectrolyte poly (diallyldimethylammonium chloride) and graphene composite. The moisture sensor has the advantages of moderate impedance value, high sensitivity, good linearity, small dampness and can be detected at room temperature in a wide humidity range, in particular in a low humidity environment, can be widely applied to the accurate measurement and control of the environmental humidity in the fields of industrial and agricultural production, storage, atmospheric environment monitoring and the like, in particular the humidity in a low humidity environment.

A thin film transistor (TFT), AMOLED pixel flexible drive circuit and manufacturing method; the AMOLED pixel flexible drive circuit comprises a switching TFT and a driving TFT; both the switching TFT and the driving TFT comprise: a substrate (1), and a gate electrode (6), a source electrode (2), a drain electrode (3), an active conductive layer (4) and a dielectric layer (5) all formed on the substrate (1); the active conductive layer (4) is a carbon nano tube; and the drain electrode of the switching TFT is electrically connected to the gate electrode of the driving TFT. The carbon nano tube thin film transistor has a great mobility ratio and a high switch ratio, thus better satisfying the requirements on light emission of OLED pixels. In addition, the present invention realizes manufacturing of an AMOLED pixel drive circuit on a flexible substrate, has a simple process, easy operation, low costs and good repeatability, and is suitable for large-scale industrial production, thus establishing a foundation for large-area printing of a flexible display.

The invention discloses a heavy-duty truck anti-rollover warning system based on sensing load. Suspension displacement is received by a displacement sensor; an acceleration signal is received by a transverse acceleration sensor; the two signals are processed correspondingly; the processed signals, in combination with a mechanical model calculated, are subjected to substitution to calculate valuesof left front, left rear, right front and right rear support reactions; the values are introduced into a lateral load transfer ratio LTR model to calculate real-time lateral load transfer ratio. Changes in suspension spring load pressure can be measured in real time so as to obtain the up-to-date position of a center of mass; magnitudes of support reactions at four wheels are acquired in real time; the magnitudes are introduced to the LTR model to calculate lateral load transfer ratio that has good accuracy and timeliness, and measured value and operating state delaying is relieved; dynamic load is measured by the heavy-duty truck anti-rollover warning system based on sensing load and meets the characteristics of a heavy-duty truck, high center of mass and low stability in turning.

The invention discloses a rotational joint module of a modularized reconfigurable robot. On the basis of planetary reduction, one level of harmonic reduction is added on motor output, a reduction ratio is improved, an output torque is added, and the transmission precision of the module is improved. An upper end cover and a lower end cover serve as installation joints, the flange-type design with locating seam allowances and pin holes is adopted, and the module is accurately and conveniently connected and located. All electric wires are arranged in a cage-type support, the upper end cover and the lower end cover and are isolated and protected by an outer cover, thereby avoiding the problem that the electric wires are coiled when a robot moves. Mechanical limit and electric limit are arranged in the module. On the basis of adopting an incremental coded disc, a rotating potentiometer is added to measure the assistant position of module movement, absolute position information is recorded under the condition of accidental power failure, and the system can continuously work after being electrified. The rotational joint module has the advantages of reasonable and simple structure, high precision and inner routing, is convenient to install and position and is safe and reliable to use.

The invention discloses a LaFeSi based magnetic refrigeration composite material and a preparation method and application thereof. The LaFeSi based magnetic refrigeration composite material comprises functional body components such as LaFeSi based alloy particles and matrix components such as low-melting-point metal or alloy, and the LaFeSi based alloy particles are bonded and coated by the matrix components to form a bulk material; and the LaFeSi based alloy particles are of a NaZn13 type structure. According to the LaFeSi based magnetic refrigeration composite material and the preparation method and application thereof, composite hot pressing is conducted between the cheap and easily-obtained low-melting-point metal or alloy and the LaFeSi based alloy particles, the appropriate low-melting-point components are selected, the pressing pressure, the hot pressing temperature, the pressure maintaining time and the like are adjusted, and thus the high-thermal-conductivity LaFeSi based magnetic refrigeration composite material can be obtained; the magnetic entropy change of the LaFeSi based magnetic refrigeration composite material is less reduced compared with that before hot pressing, the magnetic hysteresis loss is low, and thermal hysteresis is avoided; and in addition, the process is simple and easy to operate, the process conditions are relatively mild, energy consumption is little, the cost is low, the repeatability is good, and the preparation method can be widely used in preparation of magnetic refrigeration materials.

The present invention relates to finger joint of robot, and is especially finger joint of skillful robot hand. The present invention has one motor fixed to the inner wall of the first finger knuckle casing, the first synchronous pulley fixed onto the output shaft of the motor, the second synchronous pulley fixed onto the first joint shaft, one harmonic reducer mounted onto the first joint shaft, one driving member mounted onto the harmonic reducer, one 1D finger tip torque sensor mounted onto the second joint shaft, one first joint wire wheel connected to the inner wall of the first finger knuckle casing, and one second joint wire wheel connected to the 1D finger tip torque sensor. The finger joint of skillful robot hand has the advantages of high integration level, high reliability, high position accuracy and less hysteresis.

The invention relates to La-doped lead zirconate stannate titanate anti-ferroelectric ceramics with high energy storage efficiency and a preparation method thereof. The constitutional chemical formula of the anti-ferroelectric ceramics is (Pb1-1.5xLax)(ZrySn0.9-yTi0.1)O3, wherein x is greater than or equal to 0.02 and smaller than or equal to 0.04, and y is greater than or equal to 0.1 and smaller than or equal to 0.5. According to the preparation method, the anti-ferroelectric ceramics are prepared with a tradional preparation method of electronic ceramics, have the energy storage characteristics of small electric hysteresis and high energy storage efficiency, and have very important significance in developing a high-pressure impulse power capacitor with high energy storage density and high energy storage efficiency.

The invention relates to a sensor, and particularly relates to thin-film magnetoresistive sensor, in particular to a sensor used for the equivalent detection of current, the position, the movement angle and the angular speed in a magnetic field. According to the technical scheme provided by the invention, the thin-film magnetoresistive sensor comprises a seed layer, a reference layer, a non-magnetic isolation layer and a free layer, wherein the reference layer is positioned on the seed layer and generates a first exchange coupling field; the non-magnetic isolation layer is positioned on the reference layer and isolates the reference layer and the free layer; and the free layer is positioned on the non-magnetic isolation layer, inducts the change of an external magnetic field and generates a second exchange coupling field, and the second exchange coupling field and the first exchange coupling field are mutually vertical. The invention has small hysteresis, high measurement accuracy and linearity, adjustable linear range, simple manufacturing process, high response frequency, low manufacturing cost and strong anti-jamming capability.

A sensor arrangement and a method for its use for detecting the proximity of a ferrous target, the sensor arrangement comprising a sensor body including a magnetic field source and a Hall effect device, wherein the magnetic field source is an electromagnetic solenoid. The invention has particularly utility, but is not so limited, to the field of fuel injection pumps in which it is necessary to determine the volume of fuel that is delivered to the cylinders of the engine without affecting the operation of the engine.

The invention relates to a wind cup type fiber Bragg grating wind speed and direction sensor, which belongs to the technical field of photoelectron measurement. Three wind cups are arranged in a way of forming included angles of 120 degrees together with one another; the central axis of a 1# wind cup is vertical to a true north direction; grooves are formed in the lateral edges of the three wind cups to the centers of the wind cups, and are connected with the free ends of three equal-strength cantilever beams respectively in the centers of the wind cups; the three equal-strength cantilever beams are fixedly arranged on the upper half part of a boss in a helical rising way; every two gratings are symmetrically stuck to the central axes of the front face and the back face of each equal-strength cantilever beam respectively after being coupled; six fiber Bragg gratings are coupled in a boss base through input and output fibers; and the input and output fibers are connected to a fiber grating signal demodulator. A fiber grating information material has the special physical properties of small size, electromagnetic interference resistance, long service life and the like, so that real-time online monitoring of the wind speed and wind direction of a wind load alarm control unit is realized, and high interference resistance and high accuracy are realized.

The invention discloses a polyimide humidity-sensitive material and a preparation method thereof, relates to a humidity-sensitive material and a preparation method thereof, and aims at solving the problems that an existing polyimide humidity-sensitive material is in humidity hysteresis and large in nonlinear output, and a polyimide humidity-sensitive material precursor polyamide acid is sensitive to water vapor, poor in hydrolysis resistance and easy to degrade. The material is prepared from dianhydride, diamine, an alcohol reagent, an N,N'-diisopropylcarbondiimide condensing agent and a strong polar nonprotic solvent. The method comprises the following steps: adding the dianhydride to the alcohol reagent, reacting, putting into an ice water bath, and respectively dissolving the diamine and the N,N'-diisopropylcarbondiimide condensing agent into the strong polar nonprotic solvent to obtain a mixture A and a mixture B; respectively adding the mixture A and the mixture B to a reaction system in the ice water bath; washing, filtering and drying the product, and dissolving into the strong polar nonprotic solvent; and finally solidifying. The method is mainly applied to preparation of the polyimide humidity-sensitive material.

The compound polymer resistor film humidity-sensitive element is produced on ceramic substrate and through vaporization coating 5-8 pairs of gold finger electrodes, soaking in humidity-sensitive liquid to form humidity-sensitive film, soaking in acetone solution of celluloid to form protective film, heat treatment, and electrical ageing at high temperature and high humidity environment. The said process can produce humidity-sensitive element with wide humidity measuring range, linear response, high sensitivity, fast response, high humidity environment tolerance, good repeatability, high long-tern stability and excellent humidity response characteristic, and can be used in precise measurement and control of environment humidity.

The invention discloses a double-axis positioning transmission mechanism, and mainly solves the problems that the existing double-axis positioning transmission mechanism is complicated in structure, low in transmission efficiency, poor in rigidity and short in service life. The double-axis positioning transmission mechanism is characterized by comprising a vertical rotating box and a horizontal rotating box which are arranged on a fixed frame, wherein motors on the vertical rotating box and the horizontal rotating box respectively drive a vertical transmission mechanism and a horizontal transmission mechanism through first transmission mechanisms; the vertical transmission mechanism and the horizontal transmission mechanism drive output pieces to respectively drive the corresponding rotating box to rotate; output surfaces which are connected with a load are arranged on the vertical rotating box and the horizontal rotating box. The double-axis positioning transmission mechanism is compact in structure, simple, practicable, large in the output shaft and rigidity, capable of realizing outputting at the two ends, light in the whole weight, suitable for industrialized large-batch production, high in transmission ratio and transmission efficiency, low in return difference, high in bearing capability and shock resistance, and long in service life.

The invention provides a novel proportion electromagnet and belongs to the technical field of electromagnets. The electromagnet solves the problem that the existing proportion electromagnet is unreasonable in design and cannot ensure concentricity of two bearings arranged at two ends of a push rod. The novel proportion electromagnet comprises a casing with a first inner cavity and a second inner cavity. A magnetic core pipe, a coil assembly and a first sealing ring are arranged in the first inner cavity, an output through hole and a containing cavity are formed in the magnetic core pipe, an armature assembly formed by an armature and a push rod is installed in the containing cavity, a first bearing is sleeved at one end of the push rod, a self-lubricating bearing coaxial with the push rod is sleeved at the other end, a bearing seat for installing the self-lubricating bearing is connected onto one end of the containing cavity close to the second inner cavity in a sealing mode, and the push rod sequentially penetrates the first bearing, the armature and the self-lubricating bearing and partially stretches into the second inner cavity. The proportion electromagnet has the advantages of being reasonable in design, reducing matched size between parts and being capable of ensuring the concentricity of the two bearings arranged at two ends of the push rod.

A space manipulator modular driving joint comprises a motor driving assembly, a mechanical transmission assembly, a sensing control assembly and a structure supporting assembly. The motor driving assembly comprises a brushless DC motor, and the mechanical transmission assembly comprises a harmonic reducer and a planetary reduction gear. The sensing control assembly comprises an absolute position encoder and a driving controller. The structure supporting assembly comprises an input flange, a motor support, a bearing inner pedestal, a bearing outer pedestal, an output flange, a harmonic wave output shaft, a bearing end cover, a mechanical limiting block, a controller support and a controller shell. The space manipulator modular driving joint has the beneficial effects that the problems that in an existing space manipulator technology, a driving joint is low in precision, and the size and the weight of the joint are large are solved; modular design is adopted, the interchangeability between joints is good, and the refinement degree and the load capacity of space manipulators are improved.

The invention relates to a repulsion-type electromagnetic displacement actuator, adopting a principle of opposite magnets repulsing mutually to make a repulsion-type electromagnetic actuator, making the same pole tips of the magnetic filed generated by fixed helix tube in the actuator after electrified and the magnetic filed of an armature are opposite so as to generate a repulsion force to push the armature to move, balancing compression return spring or other balance return devices, thus primely solving the problem of nonlinear resultant force displacement property, and strengthening its control accuracy and stability. The material of the moving armature is a soft-magnetic material, both realizing excellent property of proportional electromagnet and avoiding the problems of process complexity, reliability reduction and effective travel reduction of the proportional electromagnet, etc. And it remedies the disadvantage of unstability and control difficulty caused by a system composed of ordinary electromagnet and spring.

The invention discloses a polymer composite resistance-type humidity sensing element with a nanofiber structure and the preparation method thereof. The humidity sensing element adopts ceramics as a matrix, a plurality of pairs of interdigitated gold electrodes are arranged on the matrix, the surface of the ceramic matrix and the interdigitated gold electrodes are coated with poly (diallyldimethyl ammonium chloride) (PDDA) modifying film, and a poly-3-aminopropyl-triethoxysilane mono-brominated n-hexane quaternary ammonium salt, polyanion and polyoxyethylene composite nanofiber humidity sensing film with a cross-linked structure is settled on the modifying film. The humidity sensing film is in a good contact with an electrode substrate by means of the modifying film. The manufacturing method has the advantages of simple process and low cost. The prepared humidity sensing element has the characteristics of moderate impedance value in a wide humidity range, high sensitivity, good linearity, rapid response, good resilience, good stability, etc., and is widely applicable in precise measurement and control of ambient humidity in industrial and agricultural production process, storage, and atmospheric environment monitoring.

A strain sensor consisting of a non-conductive polymer mixed with conductive nanoparticles below the percolation threshold and preferably less than 10% v / v of the polymer. The polymer is polyimide, and the conductive nanoparticles are carbon black with an average particle diameter of 30-40 nm and an aggregate particle size of 100-200 nm. The sensor can detect tension, compression and torsional strain.

The invention relates to a pneumatic muscle and a realized driving mechanism thereof. The pneumatic muscle comprises a pneumatic muscle body, wherein the pneumatic muscle body is provided with an axial cavity which is used for charging / discharging compressed gas so as to provide a pulling force along the axial direction of the pneumatic muscle body; the pneumatic muscle body comprises an elastic hose with an axial activity and a woven mesh pipe which wraps the outer layer of the elastic hose and is used for restraining the axial deformation of the elastic hose; the woven mesh pipe comprises a plurality of lubricating pipes which are woven in a staggered mode; and restraining silks are respectively arranged in the lubricating pipes. According to the pneumatic muscle, the frictional force at the staggered positions is reduced when the pneumatic muscle body is deformed; the retardance caused by the body frictional force of the pneumatic muscle can be reduced; and therefore, the accuracy of pneumatic muscle mathematical models can be increased and the position control precision of the pneumatic muscle is increased.