282results about How to "High response frequency" patented technology

A thin film field effect transistor is disclosed that includes a gate electrode, a gate insulator film the on gate electrode, and a first organic electronic material film containing a first organic electronic material on the gate insulator film. A source electrode and a drain electrode are spaced apart from each other on the first organic electronic material film. The first organic electronic material film includes a portion between the source electrode and the drain electrode that is in contact with the gate insulator film. This portion provides a current path. The current is controlled by the potential of the gate electrode. There is a second organic electronic material film that is in contact with the surface of first organic electronic material film opposite to the portion that provides the current path. The second organic electronic material film contains a second organic electronic material and an electron acceptor or an electron donor. The thin film field effect transistor facilitates accumulating electric charges in the channel on the gate insulator film and realizing a high response frequency.

PROBLEM TO BE SOLVED: To provide an LED driving device which can drive an LED by constant current, reduce heat generation of a circuit element group including LEDs by optimizing voltage to be supplied to the LED, and stably light a backlight unit during light controlling. ŽSOLUTION: In the LED driving device, a first negative feedback closed loop CL1 for controlling supply voltage is comprised of a DC / DC convertor 8, an output driving element 10, a voltage comparison circuit 12, and an output voltage control circuit 13, and a second negative feedback closed loop CL2 for controlling constant-current is comprised of an output driving element 10 and a constant-current control circuit 11. The frequency response characteristic of the first negative feedback closed loop CL1 for controlling supply voltage is set to 1 / 20 or less of that of the second negative feedback closed loop CL2 for controlling constant current, so that the first negative feedback closed loop CL1 for controlling supply voltage can be stably operated without spoiling the response of controlling the constant current. Ž

The invention relates to an embedded satellite laser ranging control system, and solves problems that the satellite laser ranging control technology implemented through a main control computer is complex in ranging method, is low response speed and causes the data loss. A telescope tracking controller reads a current observation moment, calculates the azimuth and height position at the current moment through orbit prediction interpolating of an observation station, and outputs the azimuth and height position to a servo system of a motor. A distance gate controller outputs an igniting signal of a laser according to a distance measuring frequency, locks a main wave signal, and calculates the moment when a distance gate signal corresponding to a main wave is generated. A gate control signal is outputted through the distance gate controller. A laser beam direction controller recognizes a light beam image, obtains a light peak position, calculates the deviation between the light peak point and the center of a receiving visual field, and corrects the direction deviation of a laser beam through a control algorithm. The system can meet the demands of higher-repetition-frequency laser ranging through employing an FPGA+DSP heterogeneous processor configuration, and facilitates the upgrading of the whole ranging system.

The invention discloses a thermocouple with micron scale or nanometer scale tip curvature radius and a manufacturing method thereof, and relates to a micron / nano thermocouple manufacturing method which can quickly respond to temperature variation in a tiny area and employs an electrochemical process for corrosion and a vacuum deposition technique to process the thermocouple with the tip curvature radius ranging from tens of microns to a plurality of nanometers. The thermocouple is composed of three parts, a metal needle point (11) with the micron scale or nanometer scale tip curvature radius is taken as a substrate, an insulating layer (12) is wrapped outside the substrate, the tip of the metal needle point (11) is exposed, and a layer of metal film (13) is arranged on the tip of the insulating layer (12) and the exposed metal needle point (11).

The invention discloses a plasma unmanned aerial vehicle. First plasma exciters are distributed on the leading edges of a left wing and a right wing of the aerial vehicle; second plasma exciters are distributed in the one fourth positions of chord lines; and third plasma exciters are distributed in the maximum thickness positions. Meanwhile, a miniaturized plasma power supply is designed and integrated into the aerial vehicle, and a switch and relevant discharge parameters of the plasma power supply can be controlled through a program or in a remote control manner. When the plasma exciters start to work, the adverse pressure gradient resistance of a boundary layer is enhanced by means of plasma jet generated by the exciters, a flow field of the upper wing surface of the aerial vehicle can be controlled, and the aerodynamic characteristics of the aerial vehicle are improved; starting of the plasma exciters in the different positions is appropriately adjusted, and aerodynamic moment can be produced, so that the flight attitude of the aerial vehicle can be controlled; and the plasma aerial vehicle has the characteristics that the aerodynamic characteristics are improved, control plane flight controlling is not required, the invisibility is good and the like.

The invention discloses a non-contact type overvoltage sensor based on the electro-optic effect. The non-contact type overvoltage sensor comprises a non-contact sensing unit and an electro-optic sensing unit, wherein the non-contact sensing unit comprises an induction metal plate and a low-voltage arm module, the induction metal plate is used for being arranged below an aerial power transmission line, the low-voltage arm module is arranged between the induction metal plate and the ground, the low-voltage arm module is composed of a capacitor C2 and a peripheral circuit of the capacitor C2, one end of the capacitor C2 of the low-voltage arm module is electrically connected with the induction metal plate, the other end of the capacitor C2 is grounded, and a voltage signal output end between the capacitor C2 and the induction metal plate is electrically connected with a signal input end of the electro-optic sensing unit. The non-contact type overvoltage sensor based on the electro-optic effect is simple in structure, small in size, high in stability, and convenient to install, popularize and apply, and facilitates remote control; mutual conversion between optical signals and electrical signals is achieved through the electro-optic effect, long-distance signal transmission is achieved through optical fibers, and compared with a traditional photoelectric sensor, the non-contact type overvoltage sensor based on the electro-optic effect has the advantages that the size is smaller, the response efficiency is higher, and the sensor is not influenced by an electromagnetic field.

The invention discloses a dual-axis anti-shake camera module. The dual-axis anti-shake camera module comprises a deflection structure combination, a camera module and a stable control combination; thedeflection structure combination comprises a casing, an upper elastic support body, a lower elastic support body, coils and permanent magnets; the camera module is embedded in the upper elastic support body and the lower elastic support body, and suspends in the casing; the coils are mounted on an outer wall of the camera module; the permanent magnets are disposed on the inner wall of the outer casing corresponding to the coils; and the bottom of the camera module is connected with the stable control combination. The invention also discloses a control method for a dual-axis anti-shake cameramodule, which uses an inertial sensor to sense the angular velocity of biaxial motion of an image sensor, obtains a driving output by running a feedback control algorithm, drives the coils to drive the image sensor to deflect, captures image data information, and performs data processing and output. The invention has the advantages of compact structure, small appearance, low cost, firmness and reliability, stable image performance, no image loss, and is suitable for motion photography.

The invention discloses a current measurement device, which is used for measuring current in a powered-on lead wire. The current measurement device comprises a plurality of measurement units; each of the measurement units comprises a first sensor and a second sensor, wherein the first sensor is arranged along a tangent direction parallel to a magnetic field around the powered-on lead wire and used for measuring a current value within a low measurement range, and the second sensor is arranged in a manner of forming an angle with the tangent direction of the magnetic field around the powered-onlead wire and used for measuring a current value within a high measurement range; and the first sensor and the second sensor are located in the same plane vertical to a straight line where the powered-on lead wire is placed and connected with a sensor special application specific integrated circuit (ASIC) chip. By using the advantages that a triple modular redundancy (TMR) sensor is high in sensitivity and a hall sensor is wide in linear measurement range or measuring a component of the magnetic field around the powered-on lead wire by using the inclined TMR sensor, the current measurement device is high in sensitivity and wide in linear measurement range, and has the advantages of high temperature characteristic and response frequency, low power consumption and small volume.

The invention discloses an NP-type CMOS avalanche photodiode with a deep N-trap. The NP-type CMOS avalanche photodiode comprises a P-type substrate, an N-trap layer and an avalanche area. The N-trap layer and the avalanche area are arranged on the P-type substrate, the avalanche area is arranged between the P-type substrate and the N-trap layer to form a PN junction, a light absorbing layer is further arranged between the P-type substrate and the avalanche area, the light absorbing layer is the deep N-trap arranged on the P-type substrate, and the dosage concentration of the deep N-trap is larger than that of the P-type substrate. By means of the NP-type CMOS avalanche photodiode, the rate, the frequency response and bandwidth of avalanche photodiode devices are improved.

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.

The invention provides a magnetostriction-based precise feeding driving device. The device comprises a magnetic-induced driving shaft body, and a loop magnetic field generating device which sleeves the magnetic-induced driving shaft body is rotated relative to the magnetic-induced driving shaft body; an excitation magnetic field for enabling a magnetic-induced displacement driving mechanism to drive and displace is arranged between the loop magnetic field generating device and the magnetic-induced driving shaft body; an elastic end cover part of the magnetic-induced driving shaft body is elastically deformed only in the displacement output direction. The invention also provides a processing machine tool equipped with the magnetostriction-based precise feeding driving device. According to the magnetostriction-based precise feeding driving device, the structure is simple; the mass is light; the magnetism between a permanent magnet and / or an electromagnet is utilized to generate processing acting force for rotating and reciprocating vibrating; the control precision is high; the response frequency is high; a conductive sliding ring is removed, so that the reliability of the device is improved; the magnetostriction-based precise feeding driving device is particularly suitable for hard and brittle materials and metals which are difficultly processed such as titanium.

The invention discloses a control software of a tractor wet clutch test stand, comprising a driving motor, a transducer, a speed changing box, an input inertia disk, a movable oil supply system, a clutch box body, an output inertia disk, a brake device, a counter torque device, a torque sensor, a coder, a temperature sensor, a pressure sensor, an industrial personal computer, a data acquisition module, a data acquisition card, a programmable logic controller, a digital meter, a potentiometer, a proportional amplifier and the like, wherein the transducer is connected with the driving motor which is connected with the input inertia disk, and the driving motor is connected with the clutch box body by the speed changing box, is connected to the output inertia disk by the output torque sensor and is connected to the counter torque device; the sensor is connected with the data acquisition module; and a connecting and separating valve and a loading and unloading valve are connected with the programmable logic controller which is connected with a computer by a 232 serial port. In addition, the invention also comprises control method steps of the control software. Verification proves that the invention has favorable effect, totally satisfies the technical requirement of the test stand and is safe and reliable.

The invention provides a servo-pump-controlled hydraulic rotary driving system and a control method. According to the system, a hydraulic motor is connected with two hydraulic pumps which are connected with a servo motor and controlled by a servo driver and the servo motor. A motion control unit is connected with the servo driver and two pressure sensors arranged on a hydraulic motor connecting pipeline. An angular displacement sensor on the hydraulic motor is connected to the motion control unit. The control method includes the steps that the servo motor rotates positively and negatively to drive the pumps to rotate positively and negatively, and then the hydraulic motor is driven to rotate positively and negatively. The motion control unit precisely and quickly controls the angular displacement, the speed and the torque of the hydraulic motor according to set requirements and feedback of pressure and angular displacement. According to the servo-pump-controlled hydraulic rotary driving system and the control method, the high response frequency and high precision control of the hydraulic motor can be achieved, and wide-range gear ratio adjustment can be conveniently achieved. The servo-pump-controlled hydraulic rotary driving system is simple in structure, low in cost and reliable in control.

The invention provides a power system temporary overvoltage monitoring system, which comprises a weak damping equipotential shielding-type capacitive voltage divider, a signal conditioning circuit, a data acquisition module and an industrial control computer, wherein the weak damping equipotential shielding-type capacitive voltage divider acquires voltage signals of the power system and outputs the signals to the signal conditioning circuit; the signal conditioning circuit conditions the voltage signals to signals suitable for the data acquisition module; the data acquisition module carries out multichannel synchronous A / D conversion on the voltage signals after being conditioned by the signal conditioning circuit, and the converted digital signals enter the industrial control computer via a communication interface; and the industrial control computer processes signals acquired by the data acquisition module for realizing online monitoring, offline analysis and remote access and control on the power system temporary overvoltage. A temporary overvoltage response can be built; and after equipment is subjected to lightning strike and other temporary overvoltage damages, the system records related data, the data serve as a damage judgment basis, and correct insulated matching is realized.

The invention discloses a fiber bragg grating vibration acceleration sensor for monitoring low-frequency earthquake waves. In the sensor, a slot a is formed on the side wall of the upper part of a hollow rod, an upper gasket is arranged on the lower end of the hollow rod and a lower gasket on the outer edge of which 3 to 8 slots are formed at equal intervals, the hollow rod below the slot a is provided with an upper braking block and a lower braking block positioned below the upper braking block; the hollow rod between the upper braking bock and the lower braking block is provided with a mass block moving along the hollow rod; the distance between the upper surface of the mass block and the bottom surface of the upper braking block is 4 millimeters, and the distance between the lower surface of the mass block and the upper surface of the lower braking block is 8 millimeters; the hollow rod below the mass block is provided with an elastic beam formed by connecting the upper ends of 3 to 8 elastic arms and a wafer and mounting the free ends of the 3 to 8 elastic arms on the lower gasket; a vibration sensing fiber grating is arranged on the outer face of any one of the elastic arms; and the input and output ends of the vibration sensing fiber grating are inserted into the hollow rod from the slot a and come out from the upper end of the hollow rod.

The invention discloses a closed-loop control-based micro-Newton order micro-thrust dynamic test table and test method. The micro-thrust dynamic test table comprises a swinging arm, a calibration coil, a calibration magnet, a calibration controller, a displacement sensor, a displacement sensor clamping piece, a PID closed-loop control module, a displacement meter controller, a damping mechanism, adriving force coil, a flexible shaft mechanism and a base, wherein the swinging arm is arranged on the base by the flexible shaft mechanism, the calibration coil is wound around an outer side of thecalibration magnet and is connected with the calibration controller, the driving force coil, the displacement meter controller and the calibration magnet are sequentially arranged on the swinging arm,the driving force coil, the displacement meter controller and the displacement sensor are connected with the PID closed-loop control module, the damping mechanism and one end, near to the driving force coil, of the swinging arm are arranged at intervals, and a to-be-measured thrust device installation station is arranged at the other end of the swinging arm. By the micro-thrust dynamic test table, the inherent frequency of the micro-thrust dynamic test table can be effectively improved, and the micro-thrust dynamic test of micro-Newton order is achieved.

The invention discloses a high-fidelity transistor audio power amplifier which mainly comprises a prime amplifier and a post amplifier. An input port of the prime amplifier is connected with an audio input signal input by an external audio input device, the output port of the post amplifier is connected with an external audio output device, and the output port of the prime amplifier is connected with the input port of the post amplifier through a resistor. The post amplifier mainly comprises a common-emitter common-base differential input stage circuit, a common-emitter common-base principal voltage amplification stage circuit, a UBE multiplying and temperature protection circuit, an improved three-level Darlington push-pull output stage circuit, an alternative circuit / direct current negative feedback circuit, an active servo circuit, a voltage-stabling and filter circuit, a constant flow source circuit, an image constant flow source, two RC resistor-capacitor filter circuits, four capacitor filter circuits, a horn protection circuit and a post power circuit, wherein the power circuit supplies electricity to the common-emitter common-base differential input stage circuit, the common-emitter common-base principal voltage amplification stage circuit, the UBE multiplying and temperature protection circuit, the improved three-level Darlington push-pull output stage circuit, the alternative circuit / direct current negative feedback circuit, the active servo circuit, the voltage-stabling and filter circuit, the constant flow source circuit, the image constant flow source, the two RC resistor-capacitor filter circuits, the four capacitor filter circuits and the horn protection circuit. The high-fidelity transistor audio power amplifier achieves the conditions that a circuit is direct-current and wide-band, and can effectively improve listening feelings.

The invention relates to an electromagnetic force actuator for active support of an astronomical telescope mirror face. One end of the force actuator is connected with a supported mirror face through a force sensor, and the other end of the force actuator is fixed in a mirror cell. The electromagnetic force actuator is characterized in that a force output end of the force actuator is arranged on an axle at the center of the force actuator; two permanent magnets with strong magnetism are arranged on the center axle of the force actuator; a coil with an iron core is fixed on a shell of the force actuator; and the output of the force actuator is connected with a control system, and the control system is connected with the coil with the iron core. The electromagnetic force actuator for the active support of the astronomical telescope mirror face has the advantages that structure is simple, mass is low, energy consumption is low, control accuracy of input force is high, response speed is high, stroke of the force actuator is large, force adjusting range is wide, environment requirements are low, and the force actuator can be used in South Pole and even in space special environment. Connection of the force actuator and the mirror face is facilitated.

The invention discloses a membrane servo valve driven by piezoelectric ceramics. The membrane servo valve comprises an upper valve body and a lower valve body, wherein a membrane is arranged between the upper valve body and the lower valve body; a cylindrical balancing oil cavity is formed between the upper valve body and the membrane; a ring-shaped throttling oil cavity is formed between the membrane and the lower valve body; the balancing oil cavity and the throttling oil cavity are communicated with each other; an ejector rod vertically penetrates through a space between the upper valve body and the balancing oil cavity; one end of the ejector rod is arranged with a set spacing distance to the membrane, or in contact with the membrane; one of the piezoelectric ceramics used for pushing the ejector rod to move is arranged at the other end of the ejector rod. The membrane servo valve has the benefits that through precise control of a throttling interval, the pressure and the flow can be precisely and actively controlled; the center of the membrane is set to be a central island shape, the central island shape is rigid, and a deformation zone around the central island shape is flexible, so as to improve the dynamic frequency of the membrane; meanwhile, the throttling interval control precision is improved, and the whole membrane servo valve is simple in structure, reliable in function and low in manufacturing cost.

The invention discloses a double heterojunction ultraviolet detector, wherein a positive polarization charge is formed on the upper surface of the GaN absorption layer and a negative polarization charge is formed on the lower surface; Under the action of the polarized charges, a two-dimensional hole gas 2DHG as a transport channel for photogenerated holes is formed between the interface of the AlNbuffer layer and the GaN absorption layer, A two-dimensional electron gas 2DEG is formed between the interface of the GaN absorption layer and the AlGaN barrier layer as a transport channel for photogenerated electrons, and the working mode of the detector is that light is incident from the upper surface of the Schottky contact layer. The invention adopts AlGaN / GaN / AlN double heterojunction to replace the traditional AlGaN / GaN single heterojunction, so that the photogenerated holes can be transported quickly through the 2DHG channel, thereby eliminating the signal tail phenomenon caused by the slow migration speed of the photogenerated holes in the single channel structure. The quantum efficiency and response frequency of the device is further improved by the efficient collection of 2DHG.Due to the existence of two-channel polarized charge, it is easier to form vertical electric field distribution in GaN absorption region.

A photoelectric detector array-based glass shape detection system comprises a heating furnace, a glass-loading table, a toughening cooling section, a glass-unloading table, a control system and a light source, the heating furnace is used for toughening glass, the glass-loading table, the toughening cooling section and the glass-unloading table are arranged on both sides of the heating furnace, the control system is used for controlling the operation process of the toughening furnace, a detector which is used for receiving light intensity distribution information is also arranged under a roller conveying mechanism, and comprises a case, the front end of the case is provided with a light attenuation window, a collimator is arranged behind the light attenuation window, photosensitive units which are used for receiving and converting light intensity information into an electric signal are arranged behind the collimator, the detector can transmit the received shape image signal of detected glass to the control system, and the shape image signal is displayed. In the photoelectric detector array-based glass shape detection system, the light attenuation window can prevent the affection of environmental light, the collimator can effectively block the passing environmental stray light, the transmitted light can be better received by the photosensitive units, consequently, the outline of the glass can be effectively detected, and the accuracy of glass shape identification is increased.

The invention discloses a graphene based surface plasmon polariton electric-absorption light modulator.The graphene based surface plasmon polariton electric-absorption light modulator comprises a substrate, a first micro-nano waveguide, a second micro-nano waveguide, a dielectric layer, first single-layer graphene, a first electrode and a second electrode, wherein the first micro-nano waveguide and the second micro-nano waveguide are stacked on the substrate, the dielectric layer and the first single-layer graphene are located between the first micro-nano waveguide and the second micro-nano waveguide, and the first electrode and the second electrode are respectively connected with the first micro-nano waveguide and the second micro-nano waveguide and are used for exerting modulation voltage.At least one of the first micro-nano waveguide and the second micro-nano waveguide is a metal waveguide.The first single-layer graphene is located between one metal waveguide and the dielectric layer.One of the electrodes is connected with the corresponding metal waveguide through the first single-layer graphene.The graphene based surface plasmon polariton electric-absorption light modulator adopts the structural design of vertical arrangement, integrates with the advantages of the graphene and SPP and enables the modulation height to be higher than the height of an existing electric-absorption light modulator and to reach 70% or above.In addition, the light modulator is smaller in structural capacitance, and the overall response speed of the light modulator is greatly improved.

The present invention discloses a cable fault detection testing system and a working method thereof. The system comprises a microprocessor, DDS signal generators 1 and 2 which generate two paths of rectangular wave signals with consistent frequency and amplitude, adjustable inductors 1 and 2 which are connected between the DDS 1 and 2 and a detected cable in series, adjustable standard capacitors which are connected between current transformers 1 and 2 and a same ground end in series, a peak detectors 1 and 2 which are respectively connected to the current transformers 1 and 2 in series, a multiplier which calculates the correlation of the output signals of the detectors 1 and 2, and an analog to digital converter which carries out analog to digital conversion on a multiplier output voltage signal and then sends the signal into the microprocessor. Compared with the prior art, based on the two paths of symmetrical rectangular wave signals, the effective detection of a cable fault can be realized, a test signal waveform quality requirement is low, the signal sampling rate is low, the system structure is simple, the realization is easy, and the cost is low.

The invention discloses a compensated single-trailing-arm hydraulic driving hanging system for an engineering vehicle. One end of a hanging arm (4) of the hanging system is connected with a wheel edge driving system (6), the other end of the hanging arm (4) is connected with a compensation slide block (2) of a lateral displacement compensation mechanism (11), the compensation slide block (2) and a compensation hydraulic cylinder (1) are mutually connected, the compensation hydraulic cylinder (1) is connected with a whole body hinge, the middle part of the hanging arm (4) is connected with a hanging hydraulic cylinder (5), and the hanging hydraulic cylinder (5) is connected with the vehicle body hinge. The compensation hydraulic cylinder (1) and the hanging hydraulic cylinder (5) are connected with a hydraulic control valve block (9) through a pipeline, and the hydraulic control valve block (9) is connected with a constant-pressure hydraulic oil source (8) through a pipeline. Two hydraulic cylinders are used for driving one hanging arm, a controller is used for controlling the two hydraulic cylinders in real time according to the ground condition or the artificially input parameters, and a hanging wheel shaft moves according to specified requirements. The compensated single-trailing-arm hydraulic driving hanging system has the advantages that the occupied space is small, the regulation quantity of the gap from an underpan to the ground is great, and the like.

The invention discloses a transparent electrode grid-control transverse PIN blue and purple photo-detector and a method for manufacturing the same. The photo-detector comprises a P (positive)-type substrate. N (negative) wells and a deep N well are isolated from one another to form a reversed P well in the P-type substrate, an N<+> zone and a P<+> zone are arranged in the reversed P well, a grid oxide layer, a transparent conducting thin film and a grid electrode G sequentially cover the surface, which is positioned between the N<+> zone and the P<+> zone, of the reversed P well, an anode A is arranged on the N<+> zone, and a cathode K is arranged on the P<+> zone. The method for manufacturing the transparent electrode grid-control transverse PIN blue and purple photo-detector includes isolating the N wells and the deep N well from one another to form the reversed P well on the P-type substrate; forming the N<+> zone and the P<+> zone on two sides of the reversed P well and respectively forming the anode A and the cathode K; sequentially manufacturing the grid oxide layer, the transparent conducting thin film and the grid electrode G on the upper surface of the reversed P well. The transparent electrode grid-control transverse PIN blue and purple photo-detector and the method have the advantages that the problem of conflict between the quantum efficiency and frequency response of existing photo-detectors can be effectively solved, and the transparent electrode grid-control transverse PIN blue and purple photo-detector is low in dark current, high in quantum efficiency, rapid in frequency response, big in input impedance and favorable for integration.

The invention discloses a pipe monitoring system and monitoring method based on microstructure optical fiber distributive sensing. The system comprises a distributive sound wave sensing subsystem, a prewarning identification subsystem, and microstructure optical fibers laid on pipes to be monitored; the distributive sound wave sensing subsystem is used for generating signal light, injecting the signal light into the microstructure optical fibers, and detecting reflecting signal light to obtain phase information and position information of the reflecting signal light through demodulation; the prewarning identification subsystem is used for judging the pipe health conditions according to the phase information and further identifying pipe abnormal modes or prewarning the pipe corrosion conditions; and the microstructure optical fibers are used for transmitting the signal light and generating the reflecting signal light with pipe sound wave or vibration information. The system can synchronously realize monitoring and prewarning, is high in monitoring sensitivity and positioning precision, and meanwhile, is high in response frequency to abnormal events.

The invention discloses a working roll bending device of a plate band rolling mill. The device is fixedly arranged on a rolling mill stand, and roll bending devices are arranged on two end parts of an upper working roll and a lower working roll so as to carry out supporting, balancing and roll bending control on the upper working roll and the lower working roll to improve the convexity of a loaded roll gap between the upper working roll and the lower working roll and control the plate shape. The roll bending device comprises a memorial archway, upper roll bending devices and lower roll bending devices, wherein the memorial archway is a framework body, and upright posts at the left side and the right side of the memorial archway are respectively inwards and convexly provided with a waist bump; the upper roll bending devices can be slidably arranged in the memorial archway, positioned above the waist bump and assembled at two ends of the upper working roll; and the lower roll bending devices can be slidably arranged in the memorial archway, positioned below the upper roll bending device and assembled at two ends of the lower working roll. The working roll bending device of the plate band rolling mill can meet the working requirement of a large large-openness plate band rolling mill and has the advantages of reliable rolling quality and long service life.

The invention discloses an electromagnetic drive adhesive dispensing valve comprising a flexible amplification arm. The electromagnetic drive adhesive dispensing valve comprising the flexible amplification arm comprises an adhesive cavity (16), a nozzle (18) and an ejecting needle (13), the adhesive cavity (16), the nozzle (18) and the ejecting needle (13) are installed at one end of a support (1), one end of the flexible amplification arm (3) is installed at the other end of the support (1), the other end of the flexible amplification arm (3) is in transmission connection with the ejecting needle (13), a supporting horizontal plate (9) is arranged on the support (1), a regulating screw (8) is arranged on the supporting horizontal plate (9), a compression spring (11) is arranged between the ejecting needle (13) and the regulating screw (8), an armature (12) is installed on the flexible amplification arm (3), and an electric magnet acting on the armature (12) is installed on the support (1). The electromagnetic drive adhesive dispensing valve comprising the flexible amplification arm is rapid in response, simple in structure, large in sprayable adhesive viscosity and adjustable in spraying speed and adhesive spraying amount.

The invention provides a piezoelectric six-dimensional accelerator sensor based on a 9-SPS parallel mechanism, and relates to an accelerator sensor. The piezoelectric six-dimensional accelerator sensor comprises a shell (1), a cubic mass block (2), nine pieces of piezoceramics (3) and eighteen flexible spherical hinges (4); wherein the mass block is positioned in the center of the shell, and the upper surface, the front surface and the side surface of the mass block which are opposite to the shell are respectively provided with three pieces of piezoceramics to form three groups of piezoceramics together; the nine pieces of piezocermamics are cylindrical, and are connected with the mass block and the inner wall of the shell through the flexible spherical hinges (4); under the initial condition, the three groups of piezoceramics have pairwise orthogonal relation; and two pieces of piezoceramics on the upper surface are parallelly arranged left and right, two pieces of piezoceramics on the front surface are arranged up and down, two pieces of piezocermamics on the side surface are arranged front and back, and each group of piezoceramics is arranged symmetrically with the center of the mass block. The piezoelectric six-dimensional accelerator sensor has the advantages of simple structure, small volume, light weight, small measurement error, high precision, high sensitivity, high isotropy, wide signal band and the like.

The invention belongs to the field of hydraulic valves, in particular to an internal feedback type incremental hydraulic throttling digital valve, which comprises a hydraulic valve (1), a fixed frame (2), a mechanical transmission mechanism (4), a stepping motor (5) and a displacement sensing mechanism (3), wherein the hydraulic valve (1) and the stepping motor (5) are arranged on the fixed frame (2); the stepping motor (5) is connected with a valve core (14) of the hydraulic valve (1) through the mechanical transmission mechanism (4); and the valve core (14) and the fixed frame (2) are connected by screw threads. The digital valve of the invention is simple in structure, low in cost, strong in pollution resistance, high in reliability and low in leakage rate, meets requirements on a medium environment in a hydraulic system and can be directly controlled by digital signals sent by a computer and a single-chip machine without A / D and D / A conversion.