614results about How to "Reduce glitches" patented technology

The invention discloses a machining method of a thin-wall honeycomb core material curve machining molded surface, and aims to provide a honeycomb machining method with high milling efficiency and capable of prolonging the life of a special honeycomb combined milling tool. The machining method is realized through the following technical scheme: when a double sided tape fixing state at the earlier stage of honeycomb machining is good, the special honeycomb combined milling tool with a conical disc return milling tool is changed for cutting; the rotating direction of the special honeycomb combined milling tool is changed; the conical disc return milling tool for feeding by a wedged angle of 30-45 degrees through high-speed rotation is used for cutting roughing; according to an anticlockwise tool rotating mode in the tool rotating direction, the downward pressure is applied to a honeycomb thin-edge area (1) through anticlockwise rotation; the part, easy to be pulled and damaged, of the thinnest honeycomb edge of the honeycomb bottom cutting profile is firstly machined; and after the honeycomb thin-edge area (1) of a NOMEX honeycomb part blank is machined, the sequential gradient machining is performed in (2-6) thickness direction of the thick-edge area cutting profile layer by layer, and the other parts are machined.

The invention discloses a sand-line iron mould casting process for grey cast iron flywheel housings of diesel engines. In the invention, upper and lower sand-line iron mould processes are used, so that produced grey cast iron flywheel housing blanks have favorable geometric size precision which can be up to CT8 grade, favorable surface roughness which can be up to 12.5 microns and favorable mechanical properties, the blank processing has small allowance which can be controlled in 3mm, small flashing distortion which can be controlled in 0.5mm and small cleaning workload, so that the labor environment is improved, the environmental protection is improved, the yield is high and can be up to 95%, and the national policies of energy conservation, environmental protection and sustainable development are met.

A latch architecture for driving unit current cell of a current-steering digital-to-analog converter (DAC) which reduces the drain-source voltage variation of the output current-source transistors and reduces the coupling of unwanted injection of input digital signals as well as clock signals is presented herein. Moreover, this latch helps to achieve lower glitch during code transition with improved dynamic performance. The latch effectively uses the intrinsic RC delay of most transistors within the latch architecture in order to achieve optimal crossing points of complementary control signals. Unwanted input injection or cross-talk is reduced by introducing transistors (904, 906, 932 and 934) that are off during code transitions without compromising the DAC update speed. Conflicts between currently held and new inputs are avoided in an effort to reduce the harmonic distortion. Furthermore, the distortion as a result of the clock signal fed through each transistor in the first and second subcircuit portions cancel each other.

The invention discloses a graphene grinding and stripping device which comprises an upper grinding disc, a lower grinding disc, a driving mechanism for driving the upper grinding disc to rotate, and a material collection mechanism for collecting a product after grinding, wherein the upper grinding disc and the lower grinding disc are matched with each other; a horizontal contact surface is formed between the upper grinding disc and the lower grinding disc, the upper grinding disc is provided with an upper feed inlet, the lower grinding disc is provided with a lower feed inlet, the upper feed inlet and the lower feed inlet are both connected with the contact surface between the upper grinding disc and the lower grinding disc, and the lower end of the lower feed inlet is in sealed connection with one water inlet tube; moreover, the upper end face of the lower grinding disc is provided with a groove, and an annular region formed by rotary surrounding of the lower end of the upper feed inlet is surrounded in the groove. The graphene grinding and stripping device can realize large-size successful stripping of graphene. The invention also relates to a graphene production system containing the graphene grinding and stripping device and a graphene production method.

A hybrid tuning circuit is used consisting of a digital finite state machine and an analog tuning circuit to effectively keep the RC product of the continuous time integrator constant across process, temperature, supply, and sampling rate variations. Since the implementation is continuous, the tracking is more accurate than traditional techniques. Using a carefully chosen clocking scheme, the technique gets rid of inter-symbol interference in the feedback DAC. The technique does not use a reference frequency, thereby eliminating the need for a user to identify a reference frequency.

The invention relates to a method for testing an RCS (radar cross section) of a low-scattering conformal antenna based on two-dimensional microwave imaging, which is characterized by comprising the following steps: carrying out an RCS test on a metal envelope and a low-scattering conformal antenna in an installed state so as to obtain a two-dimensional microwave image; carrying out two-dimensional Fourier transform on the obtained new two-dimensional microwave image so as to obtain the data of a target spectral domain; carrying out an RCS test on a metal ball (the RCS of the metal ball is known) so as to obtain a two-dimensional microwave image, then carrying out two-dimensional Fourier transform on the obtained two-dimensional microwave image so as to obtain the data G0 (f, theta) of a scattered field of the metal ball, wherein the data of the scattered field varies with frequency and angle; and finally, obtaining the RCS of the conformal antenna, wherein the RCS of the conformal antenna meets the following formula: RCS= G1 (f, theta) (of the conformal antenna) - G0 (f, theta) (of the metal ball) + RCS (of the metal ball). The method provided by the invention is a method for testing an RCS (radar cross section) of a low-scattering conformal antenna in an installed state based on the two-dimensional microwave imaging technology, and after practicing, the obtained effect is good, therefore, the method provided by the invention has great engineering popularization value.

The invention belongs to the technical field of nano fiber twisted structure or micro-nano rope preparation, and particularly relates to a device for preparing a nano fiber twisted structure by using a centrifugal electrostatic spinning technology. A metal rod is placed in the vertical direction at the central line of an annular aluminum foil collector, a metal rod bracket passes through the center of the annular aluminum foil collector and is used for supporting and stabilizing the metal rod, and the bottom end of the metal rod is butted against and linked with the output shaft of a motor; and the upper part of the metal rod is provided with a circular insulated turntable vertical to the axis of the metal rod, two spinning solution containers are placed on the upper lateral surface of the insulated turntable and symmetrical to the central line of the metal rod, and the spinning solution containers are provided with communicated needle openings aligned with a spinning nozzle of the annular aluminum foil collector. The spun fiber number is accurate and controllable, the twisted structure is good, the lapping sequence is high, the voltage is low, burrs are not caused, and the deviceis convenient for measuring the mechanical property of single fibers.

The invention relates to a diamond coated cutter, which comprises a drill tip, an edge part and a handle part, and is characterized in that: (1) a substrate material is a hard alloy with less than 6 mass percent of Co; (2) the drill tip and the edge part of the cutter are coated with a diamond coating; (3) the head part of the cutter has a drilling and milling integrated structure, the apex angleof the drill tip is double apex angles of 135 degrees and 90 degrees or a disc angle of 5 to 10 degrees, and the thickness of the coated diamond coating is 10 to 30mu m. The coated cutter is manufactured by the following steps of: (1) selecting an appropriate hard alloy substrate material; (2) forming the cutter; (3) pretreating a cutter coating; and (4) preparing the diamond coating on the drilltop and the edge part of the cutter through hot filament chemical vapor deposition (CVD). The phenomena of burrs and obvious surface layer peeling when the coated cutter processes a fiber composite material are avoided.

The invention relates to the field of image processing and food monitoring, and particularly discloses a method and a device for improving the automatic focusing accuracy and speed of a camera. The method for improving the automatic focusing accuracy and speed of the camera is characterized by sequentially comprising the steps of video image collection, image format conversion, focusing template setting, night vision low-illumination scene definition evaluation value calculation, daytime scene definition evaluation value calculation, peak searching and motor-driven lens focus finding. The threshold value of the change of the definition evaluation value in the hill climbing algorithm is adaptively adjusted according to the brightness contrast, the gradient contrast and the ISO value, the change trend of the current evaluation value can be effectively judged, the peak value can be found more quickly, and the automatic focusing speed and accuracy of night vision and low-illumination scenes are improved.

We describe a switch mode power supply (SMPS) current regulation system comprising: a current sense signal input sensing a primary current of the SMPS; a voltage sense input to receive a voltage sense signal from a primary or auxiliary winding; a switch drive signal input to receive a drive signal; a timing signal generator coupled to said voltage sense input and to said drive signal input to generate a timing signal T0 indicating a duration of a period for which current is flowing through said primary winding and a timing signal T1 indicating a duration of a period for which current is flowing through said secondary winding; and a regulator to provide an output current regulation signal responsive to an average of the current sense signal multiplied by a ratio of T1 to T0, and wherein T0 and/or T1 are generated responsive to the voltage or current sense signal.

The present invention relates to a square pipe punching machine. It includes machine frame, several tool seats which are respectively oppositely-placed on two sides of said machine frame, positioning mechanism for defining punching position of workpiece and holding mechanism. On every tool seat a mobile punching needle is set, and the positioning mechanism includes a piercing rod which can be passed through the workpiece interior, in the middle portion of said piercing rod several positioning holes are cut, said several positioning holes are correspondent to the punching needles. Besides, said invention also provides the working principle of said square pipe punching machine and its concrete operation method.

The invention discloses anodic phosphorous copper balls and a preparation method thereof. The method comprises the following steps of: (1) after yellow phosphorus or red phosphorus and oxygen-free copper are melted by adopting a medium-frequency induction furnace, stirring the melt uniformly through a magnetic stirring tank to obtain phosphorous copper solution; (2) producing a phosphorous copper bar with a diameter of 20 to 50 millimeters by using the phosphorous copper solution prepared in the step (1) and an up-draw process, and continuously stamping the phosphorous copper bar to obtain copper balls of different sizes in different dies; and (3) performing polishing, burr removal, cleaning and drying treatment on the copper balls obtained in the step (2) in turn to obtain the anodic phosphorous copper balls. The anodic phosphorous copper balls have the advantages of compact crystal, thin and small crystal grain, high phosphorous copper film generating speed, exquisite and firm phosphorous copper film texture and dropping resistance, and can reduce the cleaning frequency of an anode, effectively improve the utilization rate of the anode and remarkably improve the copper plating effect.

The invention relates to a spinning technology of a two-spinning-roller semicontinuous high-speed spinning machine, and belongs to the technical field of semicontinuous spinning machines. The spinning technology comprises the steps of glue supplying, thread-line forming, spinning and winding, wherein the spinning is carried out through a spinning device. The spinning device comprises two spinning rollers which are transversely arranged relative to an operating surface of a spun surface, thread lines surround the spinning rollers, and drafting, solidifying and deacidification in the spinning steps are achieved when the spinning rollers rotate. The spinning technology solves the problems that thread lines of a semicontinuous spinning machine in the prior art are insufficient in reaction, the spinning process cannot be accelerated, and production efficiency and the product quality cannot be taken into consideration. The arrangement direction of the spinning rollers is changed so that the thread lines can walk for a longer distance while the spinning process of the spinning machine is accelerated and the structures of other components of original equipment are not changed, the thread lines can be reacted with acid bath more fully, and both production efficiency and product quality are taken into consideration.

The invention discloses a safe lithium ion battery, which comprises an anode system, a cathode system, a membrane spaced between an anode and a cathode, and an electrolyte system, wherein the anode system comprises an anode current collector and a membrane attached to the anode current collector and containing an anode active substance; the cathode system comprises a cathode current collector and a membrane attached to the cathode current collector and containing a cathode active substance; an organic conductive film is used as the current collector in one or both of the anode system and the cathode system; and a polymer matrix with positive temperature coefficient (PTC) thermistor property is adopted in the organic conductive film. The organic conductive film has the PTC thermistor property. The lithium ion battery can avoid the safety problems of battery combustion and even explosion and the like caused by over charge and battery temperature rise due to external short circuit.

The invention discloses a preparation method of high-toughness polyphenyl thioether alloy. The preparation method comprises the following steps: adding an antioxidant, an ethylene-methyl acrylate-glycidyl methacrylate special ternary random copolymer toughening material and carbon black in a linear polyphenylene sulfide (PPS) resin subjected to oxidative thermal crosslinking, and then fully and evenly mixing in a high-speed mixer so as to obtain a PPS resin premix, wherein the weight percentage of PPS to glass fiber to special toughening material to carbon black to antioxidant is (59.8-65.2):(25-35):(3-8):(1-2):(0.2-0.8); and carrying out mixing, extrusion molding, cooling and chopping to obtain finished alloy. The alloy obtained by using the preparation method has the advantages of high thermal denaturation stability, high tensile strength and low metal corrosion rate, and can be widely applied to the fields of electronic appliances, machinery, chemical industry, petroleum, military industry and aerospace, especially used as an enclosure material or packaging material for all types of batteries.

The invention discloses a negative pressure reverse cooling-adopted high-quality processing method for a fiber reinforced composite, belongs to the technical field of cutting processing, and relates to a processing method for high-quality drilling and hole making of the fiber reinforced composite. The method is characterized in that different cooling technologies are implemented when different positions of the fiber reinforced composite formed through laying and curing a plurality of layers of prepregs are drilled. The method comprises the steps that firstly, a negative pressure cover is attached to the surface of the composite during the fiber reinforced composite hole making process; negative pressure is generated in the negative pressure cover and a drilling hole cavity through utilizing an air pump; drilling dust and cuttings are quickly collected; positive pressure is generated around a drill internal cooling hole through utilizing a cutter air pump, as as to help cooling the cuttings; and when the last layers of the material are drilled, the drill internal cooling hole performs negative pressure suction instead of positive pressure ventilation, relatively high negative pressure is generated for the material at the outlet part, support is provided for the drilling process, and a drill cutting edge is enabled to cut fibers. According to the method, defects such as burrs and delamination are effectively reduced, and the fiber reinforced composite is drilled and processed at high quality.

A QFN package is provided with a lead frame formed by processing a copper alloy sheet containing 0.01 to 0.50% by mass Fe, 0.01 to 0.20% by mass P, and Cu and inevitable impurities as other components, having a micro Vickers hardness of 150 or above, a uniform elongation of 5% or below and a local elongation of 10% or below, or a copper alloy sheet containing 0.05 to 2% by mass Ni, 0.001 to 0.3% by mass P, 0.005 to 5% by mass Zn, and Cu and inevitable impurities as other components, having a micro Vickers hardness of 150 or above, a uniform elongation of 5% or below and a local elongation of 10% or below. Lead burrs formed during the dicing of the QFN package are short, and a dicing blade used for dicing the QFN package is abraded at a low wear-out rate.

The invention discloses a yarn guiding device for textile product production. The device comprises a fixing bottom plate, a guiding assembly, a burr removing assembly and an adjusting assembly, the burr removing assembly comprises a guiding tube, a heating sleeve tube and a supporting frame, the heating sleeve tube is sleeved with the guiding wire, a heating wire is arranged in the heating tube, the adjusting assembly comprises a fixing plate, an adjusting plate and a pressurizing screw rod, the fixing plate is located on the limiting frame, a tensioning roller is arranged below the bottom ofthe adjusting plate, and the pressurizing screw rod is sleeved with the limiting plate. According to the yarn guiding device, yarns can be welled guided to prevent the yarns from breaking in the conveying process, the adjustment of the angle of the yarns can be conducted according to the conveying angle of the yarns, the using range of the guiding device is expanded, burrs, impurities and the likeon the yarns are removed through the burr removing mechanism to improve the quality of the yarns, and tensioning force in the yarn conveying process can be conducted by the adjusting assembly according to the conveying demands of the yarns to help the conveying of the yarns.

The invention discloses a non-cutting variable cross-section steel plate spring, which is an arc-shaped plate spring and consists of a plurality of variable cross-section steel plate spring strips overlapped mutually. The radian of each steel plate spring strip takes a steel plate center as a symmetric point and the arcs of both ends are completely same. A straight section is arranged in the middle part of each steel plate spring strip, the exterior at the end of the steel plate spring strip presents a convex arc and both sides thereof present a concave arc. The invention further discloses a manufacturing technology and a manufacturing device of the steel plate spring. The steel plate spring and the technology thereof, on the basis of keeping the property of an original variable cross-section steel plate, can effectively reduce the generation of early fatigue sources at ends among steel plate spring strips due to corner cut burr, increase the anti-fatigue life of the plate spring, improve the utilization rate of materials, reduce mold consumption during the plate manufacturing process, reduce the labor quantity of operators and effectively reduce the production cost of the plate spring.

The invention relates to a ceramic proppant and a preparation method thereof. The ceramic proppant comprises bauxite and trimanganese tetroxide and is characterized by comprising a water-based organic binder; and the mass ratio of the bauxite, the trimanganese tetroxide and the water-based organic binder is as follows: 93-99 mass proportion of bauxite; 1-7 mass proportion of trimanganese tetroxide, 8-15 mass proportion of water-based organic binder and total mass of bauxite and trimanganese tetroxide based on 100 mass proportion. The ceramic proppant has the advantages of lower rate of sintering temperature and low broken rate.

The invention discloses a slicing machine for producing a slice laminated pole piece. According to the slicing machine for producing the slice laminated pole piece, the synchronization technology is adopted for a punching assembly and a cutter assembly, both punching and cutting are achieved through the slicing machine when a blank is operates, both the efficiency and the precision of the machine are improved, the efficiency of the slicing machine is about three times that of the prior art, the mechanical structure of the slicing machine is greatly simplified, operation is convenient, and the failure rate is low; due to the fact that a hardware mold is used for punching, burrs and dust generated during pole piece forming are effectively reduced, the pole piece is driven to move forwards by driving two synchronous belts to rotate through two motors, transmission errors which are caused when the synchronous belts are driven through one motor are reduced, and pole piece conveying precision is improved.