49results about How to "Solution volume" patented technology

The invention relates to the technical field of lithium batteries, in particular to a composite binder aqueous solution, a silicon-based negative pole piece and a preparation method and application of the silicon-based negative pole piece. The preparation method of the composite binder aqueous solution comprises the following steps: dissolving a water-based polymer binder and a micromolecular physical crosslinking agent in water, adding pyrrole, stirring, adding an initiator, and mixing to obtain the composite binder aqueous solution. A small molecule physical cross-linking agent is introduced into the water-based polymer binder, and a large number of hydrogen bond binding sites are increased, so that the mechanical property of the binder is remarkably enhanced, and the machinability of the pole piece is further improved. Meanwhile, polypyrrole can be generated in the binder through in-situ polymerization, and the polypyrrole can be tightly coated on the surfaces of the silicon particles through strong interaction between the binder and the silicon particles to form a stable conductive network, so that the charge transfer capability of the electrode is remarkably improved. In addition, the composite binder is also beneficial to formation of a solid electrolyte layer rich in Li-N and participates in formation of a solid electrolyte interface layer, so that the lithium ion transmission capability of the composite binder is further improved.

The invention relates to a direct-current circuit breaker based on a thyristor and an on-off method of the direct-current circuit breaker, and belongs to the technical field of direct-current middle-high voltage power system fault protection. The direct-current circuit breaker comprises a main switch branch, a current transfer branch, a voltage-limiting energy consumption branch and a pulse commutation loop, the direct-current circuit breaker is connected with a power system in series, and the main switch branch is connected with the current transfer branch. Two nodes connected in series are respectively marked as Q1 and Q2, the main switch branch and the voltage-limiting energy consumption branch are connected in parallel through the Q1 and Q2, one ends of secondary sides of two high-frequency transformers in the pulse commutation loop are respectively connected to the Q1 and Q2, and the other ends of the secondary sides of the two high-frequency transformers in the pulse commutation loop are respectively connected to two ends of the current transfer branch. The problem that in the prior art, a large number of pulse charging and discharging loops are configured for meeting the fault large-current breaking requirement, and consequently the size and cost are increased is effectively solved.

The invention relates to the technical field of energy storage nano materials, and provides a ZIF-67-derived CoSe2-atNC hollow nano cubic box material and a preparation method thereof.The preparation method comprises the steps that a solution A is prepared from cobalt nitrate hexahydrate, cetyltrimethylammonium bromide and deionized water, a solution B is prepared from 2-methylimidazole and deionized water, and the ZIF-67-derived CoSe2-atNC hollow nano cubic box material is obtained; adding the solution A into the solution B, stirring to prepare a ZIF-67 precursor solution, and carrying out aging reaction to prepare a ZIF-67 nanocube material; preparing a solution C by adopting a ZIF-67 nanocube material and absolute ethyl alcohol, preparing a solution D by adopting tannic acid, deionized water and absolute ethyl alcohol, and adding the solution C into the solution D for etching reaction to prepare a TA-Co hollow nano cubic box material; carrying out first heat treatment on the TA-Co hollow nano cubic box material, mixing and grinding a product of the first heat treatment and selenium powder, and then carrying out second heat treatment to prepare the ZIF-67 derived CoSe2 (at) NC hollow nano cubic box material. The preparation method can be used for preparing the sodium battery negative electrode material with high specific capacity and high cycling stability.

The invention belongs to the technical field of continuum robots, and discloses a variable-rigidity and driving combined continuum robot and an optimization design method thereof.The variable-rigidity and driving combined continuum robot comprises a second section, a middle transition section, a first section, a first section rope and a second section rope, and the second section and the first section are connected through the middle transition section; each of the second section and the first section comprises a plurality of wire guiding discs and a plurality of check rings, every two adjacent wire guiding discs are connected through the corresponding check ring to form a cylindrical pair joint, and the four first section ropes and the four second section ropes are evenly distributed relative to the center line of the continuum robot; the four first section ropes are used for driving two mutually perpendicular degrees of freedom of the first section, the four second section ropes are used for driving two mutually perpendicular degrees of freedom of the second section, and the second section and the first section move independently. The continuum robot does not need to be assembled, is flexible in movement, controllable in rigidity and small in friction force, and improves the interaction and sensing ability with the environment during operation.

The invention relates to the technical field of welding, in particular to a pressure vessel vertical girth welding device which comprises a base, a fixed rotating rod is fixedly connected to the top of the base, a supporting framework is rotatably connected to the surface of the fixed rotating rod, and a limiting sliding rod is fixedly connected to the top of the supporting framework. One end of the limiting sliding rod is fixedly connected with a motor set, and a front fixing frame, a rear fixing frame and a rotating base are movably inserted into the limiting sliding rod in a penetrating mode. According to the vertical girth welding device for the pressure vessel, the hydraulic push rod of the base can turn over the fixing device by an angle, so that the problems that the pressure vessel is large in size and heavy are solved, the pressure vessel can be conveniently placed, fixed, taken and carried when being horizontally placed, and the pressure vessel is lifted to a corresponding angle when being welded; the problem of circumferential welds of the pressure vessel is solved.

The utility model provides a bidirectional scattering distribution measuring system, which comprises a test base and a data transceiving control unit, the test base comprises a light source module, a detection module, a sample table, a first rotating mechanism enabling the sample table and the light source module to rotate relatively, and a second rotating mechanism enabling the sample table and the detection module to rotate relatively; a light beam emitted by the light source module enters a to-be-detected sample at a certain angle, and the detection module receives scattered light acted by the sample from another angle; the detection module comprises two or more detection units and a first switching mechanism used for switching the detection units. Compared with the prior art, different detection units are switched into an optical path through the first switching mechanism in an electric switching or mechanical switching mode, the multi-band spectral measurement requirement is met, and the multi-band spectral measurement device has the advantages of being high in automation degree, convenient to operate, high in measurement accuracy, wide in application range and the like.

The invention relates to the technical field of mining machinery, and discloses a light underground drill rig which comprises a vehicle body, a supporting arm and a drill arm which are sequentially connected, the drill arm is detachably connected with the supporting arm through a butt joint unit, and the drill arm is any one of a deep hole drill arm and an anchor rod drill arm; the control unit is connected with the supporting arm and the drilling arm, the control unit comprises a deep hole drilling machine module and an anchor rod drilling machine module, and the deep hole drilling machine module and the anchor rod drilling machine module are used for controlling the deep hole drilling arm and the anchor rod drilling arm to act correspondingly; the safety protection unit is arranged on the butt joint unit and used for monitoring the installation state of the drill arm and the supporting arm and giving an alarm. A modularized machine body structure is adopted, the drill arm can be replaced according to operation requirements, integrated design of a deep hole drilling machine and an anchor rod drilling machine is achieved, and the problems that the operation cost is high when two drilling machines are arranged at the same time, and the size and the mass of an underground drill machine are too large are solved; in the using process, the installation state of the drill arm and the supporting arm is monitored, and potential safety hazards are found and treated in time.

The invention belongs to the technical field of electrochemistry, and particularly relates to an artificial solid electrolyte interface film based on MXene quantum dots and a preparation method and application thereof.The preparation method includes the steps that an MAX phase is etched with concentrated hydrochloric acid to obtain MXene nanosheets, then the MXene quantum dots are obtained through freeze drying assisted by a hydrothermal method or an ultrasonic treatment method, and after the MXene quantum dots are mixed with a binder and a solvent, the MXene quantum dots are prepared into the artificial solid electrolyte interface film based on the MXene quantum dots. And coating and evaporating the solvent to obtain the artificial solid electrolyte interfacial film based on the MXene quantum dots. The reason that the MXene quantum dots are adopted as the artificial solid electrolyte interfacial film is that the surfaces of the MXene quantum dots contain a large number of lithium-loving groups, and the MXene quantum dots can be used as seed sites to induce a uniform lithium deposition process, so that the growth of lithium dendrites is effectively inhibited, and the coulombic efficiency of the lithium metal battery is improved.

The invention relates to a polymer-coated silicon-carbon negative electrode material, a preparation method thereof and a lithium ion battery. The polymer-coated silicon-carbon negative electrode material sequentially comprises a silicon-carbon base material, a carbon coating layer and a polymer coating layer from inside to outside, wherein the polymer coating layer comprises the following materials in percentage by mass: 50-98% of a high-adhesion material, 1-20% of a conductive material and 1-30% of an auxiliary material. The high-adhesion material comprises the following materials in percentage by mass: 60-95% of an acrylic monomer, 1-30% of a monomer A and 1-30% of a monomer B. The monomer A is prepared from at least one of vinyl acetate, acrylonitrile, styrene, 2-acrylamide-2-phenyl ethanesulfonic acid, hydroxyethyl methylacrylate, sodium lignosulphonate, acrylamide and N-vinyl pyrrolidone; the preparation method effectively solves the problems of volume expansion and short cycle life of a traditional silicon-carbon negative electrode material in application, and has relatively high practical value and potential market application prospect.

The invention discloses a centrifugal booster fan with high flow and high pressure ratio. The centrifugal booster fan is mainly composed of a protective net assembly, an air inlet pipe, an impeller, an end cover, a volute, a permanent magnet synchronous motor, an air outlet pipe and a valve assembly. The centrifugal booster fan adopts a pneumatic structure of an impeller and a volute, and is matched with an axial air inlet and radial air exhaust form. The impeller adopts oblique flow type wing-shaped blades, a casing line changes along with the blade tip molded line of the impeller from the air inlet side to the inlet end of the volute, the volute is of a variable cross-section gradually-expanding structure, the air outlet pipe is of a variable cross-section gradually-shrinking structure, and the valve assembly is located in the air outlet pipe. The permanent magnet synchronous motor drives the impeller to rotate to suck air, the air enters the gradually-expanding volute through the air inlet pipe to increase the volume flow, and finally the air is pressurized and exhausted through the valve and the gradually-shrinking air outlet pipe. The centrifugal booster fan has the advantages of being large in flow, high in pressure ratio and low in rotating speed, and the technical problems that an existing fan product is large in size and high in energy consumption are solved.

This utility model provides a compression and packaging device for a cushion, including a frame, a compression component, a sealing component, a clamping component, and a conveying component. The clamping component, sealing component, and conveying component are sequentially arranged within the frame along the cushion's movement direction. The clamping component clamps the plastic packaging of the cushion. The discharge end of the conveying component is connected to a cushion collection device, and the conveying component transports the compressed and packaged cushion. The compression component is located within the frame and above the conveying component, and is used to compress the cushion. This cushion compression and packaging device of this utility model incorporates a compression component that compresses the packaged cushion, making the interior of the cushion more compact. This solves the problem of bulky cushions being inconvenient to store and transport, facilitating stacking and subsequent storage and transportation.

The present invention relates to a special-purpose vehicle, and in particular to a vehicle-mounted portal detection operating system and an operating method. A vehicle-mounted portal detection operating system comprises a chassis vehicle and a carriage, wherein the operating system comprises a portal detection mechanical arm, a hydraulic system, a control system and a communication system, wherein the control system is used to control the automatic leveling legs to stably support the ground, and to operate the portal detection mechanical arm to unfold in sequence, and the portal detection mechanical arm is provided with a detection instrument. Compared with the prior art, a folding arm telescopic mechanism is adopted, which is well integrated and convenient for the mechanism to unfold; an intelligent control system is adopted to realize one-key leveling of the vehicle and automatic operation of the mechanism, shorten the operation preparation time, and improve the safety performance of the vehicle; one-key operation intelligent control is adopted to realize rapid detection of different vehicle models, and solve the problem of applicability of the detection mechanism.

The present invention discloses a metal lithium negative electrode and a preparation method and application thereof. The metal lithium negative electrode comprises metal lithium and a multi-element alloy phase distributed in the metal lithium, wherein the multi-element alloy phase comprises a skeleton phase and a functional phase, wherein the skeleton phase comprises a skeleton alloy formed by elements boron, silicon, or tin and lithium, and the functional phase comprises a functional alloy formed by lithium and at least one of the elements indium, tin, silver, magnesium, selenium or bismuth. The skeleton phase is used to stabilize the structure of the negative electrode and alleviate the volume expansion of the metal lithium. The functional phase reduces the surface potential energy of the negative electrode, regulates the uniform deposition of the metal lithium, and slows down the generation and growth of lithium dendrites.

The utility model discloses a lifting column with internal wiring, and belongs to the field of lifting equipment. The lifting column comprises a first section pipe, a second section pipe, a driving mechanism, a control unit, a wire and a drag chain, the second section pipe is sleeved with the first section pipe, the driving mechanism, the control unit, the wire and the drag chain are arranged in the first section pipe and the second section pipe, the driving mechanism and the drag chain are connected to the first section pipe and the second section pipe, and the driving mechanism is used for driving the second section pipe to ascend and descend. The drag chain is used for containing a wire, the control unit is installed on the first section pipe and / or the second section pipe, and the wire is connected with the driving mechanism and the control unit. According to the utility model, a plurality of leads in the lifting column can be accommodated through one drag chain, so that the service lives of the drag chain and the leads are greatly prolonged, the size and the weight of the lifting column are reduced, and the problems of large size and large weight due to the large number of spring wires used by the lifting column in the prior art are solved.

An integrated control box relates to the technical field of low-voltage apparatuses. The integrated control box comprises a box body, a circuit board arranged in the box body and a switch assembly electrically connected with the circuit board. The circuit board is provided with a network cable interface and an external line interface, and the circuit board comprises a routing module and a gateway module. According to the integrated control box, the integration level of devices and the function integration level of the integrated control box can be improved, so that the size miniaturization of the integrated control box is realized, and the circuit can be simplified.

The present invention discloses a functional reconfigurable filter based on a multi-mode resonant cavity, comprising: an input resonant cavity, a first output resonant cavity, a second output resonant cavity, an input feed network, a filter matching network, and an output feed network; the input resonant cavity is located at the center of the filter; the first output resonant cavity is located at the adjacent left side of the input resonant cavity; the second output resonant cavity is located at the adjacent right side of the input resonant cavity; the input feed network is located at the bottom of the input resonant cavity; the filter matching network is located at the top of the input resonant cavity; the output feed network is connected to the first output resonant cavity and the second output resonant cavity. The present invention can switch between the functions of a two-way single-pole double-throw filter switch and a duplexer function by changing the conduction and cutoff of each diode control circuit, and can achieve a low loss of about 0.45dB in different functional states, and has a high isolation characteristic of more than 30dB in the passband.

The invention discloses a method for detecting military tanks in remote sensing images based on MSG-YOLOv7, which belongs to the technical field of combining deep learning target detection with remote sensing military. The method comprises the following specific steps: obtaining a remote sensing military tank data set disclosed by Google Earth, dividing the data into a training set, a validation set and a test set in a ratio of 6:2:2; in a YOLOv7 network, using a lightweight MobileNetv3 to replace the original Backbone to reduce the size of the model; designing an SD-MP module that is more suitable for remote sensing targets, and reducing the feature loss of tank targets during downsampling; the invention replaces the traditional Backbone with MobileNetv3, and designs an SD-MP module and a GD-ELAN module, thereby achieving lightweight model, reducing the amount of calculation, and improving the representation ability of the model, solving the problem of excessive volume and calculation in military tank detection in remote sensing images, and providing a feasible solution for lightweight and efficient remote sensing tank target detection.

The invention provides a light splitting device and a preparation method thereof, and relates to the technical field of optical elements. The light splitting device comprises an optical filter used for filtering incident light into light with at least one specific wavelength; the optical grating is arranged on one side of the optical filter and is used for filtering incident light into light in a specific polarization direction; wherein the grating comprises a plurality of grid bars distributed in a linear array and a first metal layer located among the plurality of grid bars, and each grid bar comprises a dielectric layer and a second metal layer covering the surface, away from the optical filter, of the dielectric layer. According to the invention, the optical filter and the grating are integrated to realize simultaneous light splitting of spectrum and polarization. Meanwhile, the multi-layer structure of the grating can further improve the polarization beam splitting effect. In addition, a spectrum light splitting device and a polarization light splitting device are integrated, so that the problems of large size and poor stability of a light splitting device in the prior art are solved.

This invention discloses a deployable device for a large secondary mirror of a space optical remote sensing camera, comprising: several flipping mechanisms and several unfolding mechanisms; wherein the flipping mechanisms are stacked sequentially, and adjacent flipping mechanisms are connected by unfolding mechanisms; each flipping mechanism includes an upper flipping plate and a lower flipping plate; the lower end face of the unfolding mechanism is connected to the upper flipping plate of the flipping mechanism below it, and the upper end face is connected to the lower flipping plate of the flipping mechanism above it; when the flipping mechanism is unfolded, the upper and lower flipping plates are arranged vertically; when retracted, the upper and lower flipping plates are arranged parallel to each other; the unfolding direction of the unfolding mechanism can rotate 90 degrees. This invention can realize the large aperture, long focal length, lightweight, and two-dimensional planar unfolding of a space optical remote sensing camera to meet the spatial resolution requirements of remote sensing satellites in the field of space remote sensing.

The present invention discloses a fiber net support at the output side of a needle loom, comprising a needle loom body, a fiber net support mechanism is arranged at the output side of the needle loom body, a connecting rail is arranged at the lower end of the fiber net support mechanism, and the connecting rail is fixedly mounted on the outer surface of one side of the needle loom body. The tensioning adjustment of the fiber net at the output end is realized by a tensioning unit, the production quality of the fiber net is improved, and the loose fiber net is effectively prevented. At the same time, a detachable tensioning roller is adopted to facilitate the maintenance of the support, and a sleeve ring plate is used as a connecting piece between an eccentric shaft and a tensioning roller, which not only compensates and limits the two ends of the tensioning roller, but also realizes dust prevention at the connection interface between the two, and blocks the driving motor on one side to a certain extent, so as to avoid the situation that fiber debris is entangled and makes it difficult to clean and maintain later. Through the design of the support movable unit, the fiber net support mechanism is locked in a fixed state as a whole, and the position is convenient to move in a non-fixed state.

The application discloses a neural network-based electromagnetic field simulation grid self-adaptive generation method. The application performs grid partitioning on a semiconductor device simulation model, obtains original partitioning data, and constructs node features; a non-directed graph is constructed, the graph nodes of which adopt the node features of the grid points, and the connecting edges adopt the Euclidean distances between the grid points and adjacent grid points; the non-directed graph is input into a double-branch neural network, and a predicted node position is output; each node of the original partitioning data is corrected by using the predicted node position obtained by the double-branch neural network, and new partitioning data is formed to perform electromagnetic field simulation. The method can not only efficiently adjust the node density by fusing physical field information, but also strictly maintain the geometric boundary and topological structure characteristics of the device.

The pure electric 80-ton shovel-type support transport vehicle of the present invention belongs to the technical field of design and manufacturing of auxiliary transportation equipment for coal mines; it comprises a shovel, a front frame, a middle frame, a rear frame, a battery lifting frame and a battery rack, the shovel is arranged in front of the front frame, the front frame is connected to the middle frame through a hinged part, the middle frame is connected to the rear frame through a slewing bearing, the rear frame is connected to the battery rack through a battery lifting frame, batteries are installed on the battery rack, the slewing bearing is a double-row slewing bearing, the battery rack is also connected to the rear frame through a battery tilting mechanism, under the action of the battery tilting mechanism, the tail of the battery rack is tilted up or laid flat to adapt to different ground slopes; the present invention adopts a dual-motor single-bridge input time-sharing drive mode to solve the shortcomings of large power and large volume of a single motor, separates motors of the same power to reduce the volume, and can be applied to vehicles with thin coal seams, and the time-sharing drive can improve the efficiency of the whole vehicle and extend the cruising range of the battery shovel truck.

The invention provides a carbon / silicon / graphite composite negative electrode material, a preparation method and application, and relates to the technical field of negative electrode materials. Comprising the following steps that S1, a silicon source forms a nanometer silicon layer on the surface of a graphite layer through a chemical vapor deposition method, a silicon / graphite composite material is obtained, and the graphite layer is formed after worm graphite is subjected to high-temperature heat treatment modification; s2, dipping the silicon / graphite composite material in a solution of a carbon-rich precursor; s3, in an inert gas environment, performing hot press molding on the impregnated silicon / graphite composite material to prepare a sheet; s4, performing high-temperature carbonization treatment on the sheet in a nitrogen environment and a normal-pressure state; and S5, preparing the carbonized sheets into micron particles. The material has the advantages of good conductivity, good discharge capacity, good cycle stability, capability of improving the charge-discharge speed of the sodium ion battery and the like, and has wide application potential and application prospect.

A multifunctional body builder comprises a machine frame, a balance weight unit and a training unit. The balance weight unit comprises a balance weight part, and the balance weight part is installed on a guide rail vertically arranged on the rear side of the rack in a sliding mode. The front side of the rack is a portal frame, the training unit is connected with the counterweight unit through a steel cable, the training unit comprises two groups of first training mechanisms, two groups of second training mechanisms, two groups of third training mechanisms and two groups of fourth training mechanisms, and the first training mechanisms, the second training mechanisms, the third training mechanisms and the fourth training mechanisms are sequentially arranged from top to bottom and are bilaterally symmetrically arranged. According to the embodiment of the utility model, a portal frame type structure is adopted, and a plurality of training structures are arranged on the portal frame from top to bottom, so that the internal space of the single portal frame is fully utilized, the size of the body builder in the front-back direction is reduced, and the space occupation of the body builder is reduced; and the motion trails of the other training structures are fixed, so that the training actions of the user are fixed, and the user is easier to train.

The present invention provides a tile-type multi-channel T / R component, including N channels, each channel including 1 A module and 1 / 2 B module, the transmitting branch of the A module includes a power amplifier chip, an attenuator and a driving amplifier chip, and the receiving branch includes a single-pole three-throw switch, a limiter and a low-noise amplifier chip; the B module is a dual-channel chip with phase shifting and attenuation functions, and the power divider divides one signal into two paths, each of which includes a phase shifter, an attenuator and a single-pole double-throw switch chip; the C chip is a bidirectional amplifier chip with an amplification function. The present invention adopts multi-chip integration technology and microwave signal vertical transition technology to solve the difficulty of component layout caused by miniaturization, high density and multi-channel problems of tile-type T / R components, solves the contradiction between the number of channels and volume, realizes multi-channels in a small volume, meets the use requirements of a certain type of phased array radar, and provides a new idea for component miniaturization design.

The utility model provides a vehicle-mounted water tank heat preservation structure. The vehicle-mounted water tank heat preservation structure comprises a heat preservation water tank, the heat preservation water tank comprises a stainless steel water tank, rubber and plastic heat preservation cotton and oxford cloth, the stainless steel water tank is wrapped with the rubber and plastic heat preservation cotton, and the rubber and plastic heat preservation cotton is wrapped with the oxford cloth; a heating pipe is arranged in the heat preservation water tank, and a heating pipe water injection opening is formed in one side of the heat preservation water tank and communicated with the heating pipe. A water tank water filling port and a water outlet are formed in the bottom of the heat preservation water tank, a temperature sensor is arranged on the top of the heat preservation water tank, and a liquid level meter is arranged at the position, close to the top, of one side of the heat preservation water tank. The vehicle-mounted water tank heat preservation structure has the advantages of being light in overall weight, small in occupied space, rainproof, moistureproof and low in water tank heating cost.

The square heavy-load radial-resisting multi-section telescopic electric cylinder comprises a transmission assembly, a servo motor is arranged on the transmission assembly, a first bearing assembly is further arranged on the transmission assembly, a first cylinder barrel is arranged on the first bearing assembly, a second cylinder barrel is embedded in the first cylinder barrel, and the second cylinder barrel slides in the first cylinder barrel in a telescopic mode. A third cylinder barrel is embedded in the second cylinder barrel and slides in the second cylinder barrel in a telescopic mode, a first lead screw is arranged in the third cylinder barrel, the first lead screw is sleeved with a second lead screw, a connecting block is arranged at the upper end of the first lead screw, and the first lead screw drives the second lead screw to synchronously rotate forwards and backwards through the connecting block. The second cylinder barrel can completely retract into the first cylinder barrel, the third cylinder barrel can completely retract into the second cylinder barrel, the size of the electric cylinder is minimized, the stroke of the electric cylinder is maximized, the problems that a traditional electric cylinder is large in size and short in longest stroke are solved, and the service life of the electric cylinder is prolonged. The problems that an electric cylinder of an existing structure bears small radial force and is small in torque and poor in precision are solved.

The invention discloses a front-end debugging method and device based on reverse proxy and a storage medium, and the method comprises the following steps: reversely proxy a preset lightweight server to a preset proxy port of a preset local server to form a proxy server; sending an HTTP request to the preset proxy port through a front end to be debugged, and respectively obtaining a static file and a CGI file from the preset local server and the proxy server through the HTTP request; wherein the HTTP request comprises a static file request message and a CGI file request message; and sending the static file and the CGI file to the front end to be debugged, so that the front end to be debugged completes front end debugging according to the static file and the CGI file. According to the invention, the debugging efficiency of the front-end webpage can be improved.

This invention provides a large-image-area, long-working-distance objective lens system for micro-projection, comprising: a first projection lens, a first lens group (1), a first aperture stop (3), a second lens group (2), a first beam splitter (4), a first protective glass (5), and a first imaging surface (6) arranged sequentially; light emitted from the first projection lens passes through the first lens group (1), the second lens group (2), the first beam splitter (4), the first protective glass (5), and the first imaging surface (6), and forms an image on the first imaging surface (6). This invention, by setting up the lens group and specifying the material and number of lenses, solves the problems of low image quality, imbalance between lens size and mass, and excessive cost caused by projection over long distances.

The invention discloses a frequency divider system and a frequency division control method. The frequency divider system comprises: a radio frequency signal inlet connector for receiving an optical frequency comb signal; the frequency divider unit is connected with the radio frequency signal inlet connector, and the frequency divider unit comprises a plurality of frequency division stages; the VHF frequency band signal output connector is connected with the frequency divider unit and is used for outputting a VHF frequency band signal; the MCU controller is connected with the frequency divider unit and is used for controlling the frequency dividing ratio of a plurality of frequency dividing stages through GPIO (General Purpose Input / Output); and the low-frequency connector is connected with the MCU controller and is used for providing a power supply and a frequency division control signal for the system. The problems that an existing frequency divider is high in noise coefficient, low in processable highest frequency, low in dynamic range, difficult to adapt to complex and changeable application environments, low in processable input signal frequency, narrow in output frequency range, high in power consumption and high in cost and generally needs high-precision clock equipment can be solved.