38results about How to "Increased scale accuracy" patented technology

Embodiments of the invention may provide for a load regulation tuner that reduces the load regulation effect. The load regulation tuner may include a load current controlled current source that is responsive to a load current from a power transistor of a linear regulator, where the load current controlled current source includes a sensing transistor that generates a fraction of the load current as a sensed partial load current. The load regulation tuner may also include a resistor in parallel with a load current controlled current source, and where the paralleled resistor and the load current controlled current source form at least a portion of a feedback block that adjusts an operation of the linear regulator to provide a substantially constant load voltage.

The invention provides a preparation technology of a copper and aluminum combined flat wire. Firstly, copper and aluminum combined blanks are formed through horizontal continuous casting direct combination, and the area proportion of a wrapping copper layer is 15-50%. The preparation technology includes the following steps that firstly, rolling is performed, wherein a hole shape rolling technology is adopted, and the machining rate reaches 75-85% after rolling ends; secondly, drawing is performed, wherein drawing speed is controlled within 3-40 m / min, the thickness reduction amount of each pass is controlled to be 0.1-1.5 mm, the width reduction amount of each pass is controlled to be 0.1-2 mm, and the cross area total reduction amount is controlled to be 40-99% after drawing; thirdly, annealing is performed. The copper and aluminum combined flat wire can be prepared just through the horizontal continuous casting composite forming technology of copper and aluminum combined rod blanks, rolling, drawing and annealing, and efficient, short-process, high-yield and low-cost production of the copper and aluminum combined flat wire is achieved. The thickness of the copper layer of the copper and aluminum combined flat wire produced through the method is adjustable, the interface bonding strength is high and is larger than or equal to 40 Mpa, and a ten-thousand-ton-level industrialized production line and large-scale production of the copper and aluminum combined flat wire can be achieved through the method.

The invention relates to a feeding system and method for further improving proportioning precision in continuous production and feeding of chemical slurry. The feeding system comprises a control system, a powder measuring and feeding device, a twin-screw mixer, a liquid conveying pump and a flow meter, wherein at least two powder measuring and feeding devices are provided; each powder measuring and feeding device is composed of a powder feeder and a weighing module; the powder feeder is communicated with the twin-screw mixer; the liquid conveying pump is communicated with a liquid inlet of thetwin-screw mixer through a liquid conveying pipe; the flow meter is mounted on the liquid conveying pipe; the control system is used for monitoring liquid feeding flow fed back by the flow meter in real time, monitoring the weight of power materials in the powder feeder fed back by the weighing module in real time and calculating a power feeding flow. The feeding system and method provided by theinvention can automatically calculate and adjust dosages of other materials according to a set feeding proportion by monitoring an actual dosage of the materials and using one of the materials as a reference, and achieves a purpose of further improving the proportioning precision of finished materials.

A D / A conversion circuit includes a first D / A converting section which is connected with an output node, a first serial capacitor which is disposed between the output node and a first node, a second D / A converting section which is connected with the first node, and a control circuit. The first D / A converting section includes a first capacitor array section and a first switch array section. The second D / A converting section includes a second capacitor array section and a second switch array section. The control circuit performs a switch control for dynamically changing allocation of the capacitors to the respective bits of input digital data for the first switch array section of the first D / A converting section.

The invention discloses an automobile energy-saving and efficiency-increasing system, comprising an ECU control circuit, a sensor, an expander ECU control circuit, an engine air-entering and a pressure-increasing compensating mechanism, an engine liquid atomization compensating mechanism, an automatic intrusive starter, a transient power compensating mechanism and an electric machinery, wherein, the engine air-entering and pressure-increasing compensating mechanism, the engine liquid atomization compensating mechanism, the automatic intrusive starter, the transient power compensating mechanism and the electric machinery are controlled by the expander ECU control circuit. The invention can improve transient required ratio precision between air and fuel oil, transient transporting proportioning precision and the power of original automobile engine; the invention has the advantages of fast start and acceleration; the engine liquid atomization compensating mechanism can be used for increasing the expansion pressure of a combustion chamber after combusting, thereby the kinetic energy of the engine can be correspondingly improved and large amount of fuel oil can be saved when the engine outputs equivalent power; and the invention not only improves engine power but also reduces oil consumption, which is excellently characterized in that the purification degree of exhaust emission is high and has the rate of economizing gasoline which is more than 10%. The power is improved by more than 5% and the environmental protection function is superior to the original state-IV Europe.

The invention belongs to the technical field of transformers and discloses a phase-shifting winding type voltage-regulating rectifier transformer and a voltage regulating method thereof. A transformer cabinet internally comprises a phase-A core limb, a phase-B core limb and a phase-C core limb which are wound by two groups of phase-A windings, phase-B windings and phase-C windings respectively. A long-side dotted terminal of a high-voltage-side base winding in each group of three-phase windings is serially connected with a short-side dotted terminal of an adjacent-phase phase-shifting winding, and a shunting tap of a high-voltage-side long-side terminal is serially connected with an opposite adjacent-phase short-side terminal via a tap switch, so that a closed phase-shifting loop is formed; shunting taps at the terminals of the windings are serially connected via tap switches to achieve switching voltage regulation; the low-voltage-side windings in star connection and in angular connection output multi-pulse electric energy definite in phase-shifting angle and regulatable in voltage to a rectifier. The phase-shifting winding type voltage-regulating rectifier transformer and the voltage regulating method thereof have the advantages that phase-shifting angles are definite, voltage regulating range and the number of winding tapping turns are matched well, and the voltage-regulating rectifier transformer is compact in structure and good in manufacturability, so that manufacturing cost and operating loss of the transformer are reduced.

The invention provides a higher mathematic teaching aid. The higher mathematic teaching aid comprises a mounting frame, a movable board, a driving assembly, a sliding sleeve, a light emitting board and a light emitting board control device, wherein the mounting frame comprises a writing board, pen clips, board erasing frames, support legs, air holes, a motor mounting lug, sliding sleeve mounting grooves and a movable board mounting frame. The higher mathematic teaching aid has the advantages of simple structure and convenience in use, is capable of presenting prepared electronic courseware and coordinate graphics to students via the light emitting board, reducing the trouble of drawing the coordinate graphics by a teacher on site and improving proportion precision of the coordinate graphics; the writing board can also be used independently; different using effects can be achieved by adjusting the distance between the light emitting board and the writing board, so that the teaching efficiency can be improved.

The invention discloses a casting process for casting a motorcycle engine cylinder block. The evaporative pattern casting process is adopted for casting the motorcycle engine cylinder block, so that the traditional sand shakeout and decoring procedures are omitted thoroughly, treatment cost is lowered, mold cost is lowered, high-precision castings are produced repeatedly one hundred percent, and the wall thickness error is controlled within + / - 0.5 mm. The casting process includes the following specific steps that a foam plastic gasifiable pattern is manufactured; the motorcycle engine cylinder block pattern is subjected to foam plastic gasification, and then the foam plastic gasifiable pattern is combined and dried; fireproof paint is brushed or sprayed on the surface of the foam plastic gasifiable pattern, and then the foam plastic gasifiable pattern is dried again; a special sand box for containing the motorcycle engine cylinder block is placed on a three-dimensional vibration compacting table and filled with bottom sand, and then vibration compacting and strike-off are carried out; the dried foam plastic gasifiable pattern is placed on the bottom sand, layer-by-layer sand filling is carried out according to process requirements, and strike-off is carried out on the opening of the box after automatic vibration compacting; and the opening of the sand box is covered with a plastic thin film, a sprue cup is placed, and an evaporative pattern is obtained and connected with a negative pressure system.

The invention discloses a measurement injecting type proportion mixing device comprising a proportioner, a foam concentrate supply mechanism and a fire fighting water pipeline, wherein the foam concentrate supply mechanism and the fire fighting water pipeline are communicated with the proportioner; the foam concentrate supply mechanism comprises a foam concentrate storage tank, a foam concentrate delivery pump, a foam concentrate delivery pipeline, an engineering single board computer PC and a transducer, wherein the fire fighting water pipeline and the foam concentrate delivery pipeline are respectively provided with a fire fighting water flow sensor and a foam concentrate flow sensor; two flow sensors are respectively connected with the electrical signal of the engineering single board computer PC; the engineering single board computer PC is connected with the electrical signal of the transducer; the transducer is connected with the electrical signal of the foam concentrate delivery pump so as to control the revolving speed of the foam concentrate delivery pump. The measurement injecting type proportion mixing device of the invention takes automatic instrument measurement as a main control unit, uses a microcomputer transducer for controlling according to the flow change of a water supply system, can keep fire fighting water and foam liquid in a stable proportion, has high precision degree of mixing ratio and is convenient to adjust the mixing ratio.

The invention discloses a batch raw material feeding and manufacturing device based on laundry condensate bead production, and relates to the technical field of novel laundry condensate bead processing. The batch raw material feeding and manufacturing device comprises a liquid leakage prevention guide-out funnel, a batch feeding control structure used for controlling timed and quantitative feeding of raw materials is fixed at the top end of the liquid leakage prevention guide-out funnel, the top end of the batch feeding control structure is fixedly connected with a material distribution storage tank structure used for storing different raw materials in a separated mode, and the material distribution storage tank structure comprises a storage tank main body, an auxiliary supporting column, a reserved stroke groove, a discharging through hole, a first separation placing plate and a second separation placing plate. According to the batch raw material feeding and manufacturing device, the batch feeding control structure and the material distribution storage tank structure are designed in a matched mode, so that the device can conveniently and automatically carry out timed and quantitative feeding of the raw materials in batches into the laundry condensate bead production device, the capacity of feeding the raw materials in batches is greatly improved, and therefore the batching proportion accuracy in the production process and the execution performance of the feeding process at different times are improved.

The invention relates to a hot stamping process for improving the scale accuracy of measuring teaching aids. Wherein: the surface of the substrate is provided with a groove, and the scale mark is located at the bottom of the groove. The steps of the hot stamping method are as follows: prepare a hot stamping relief with a scale; place the hot stamping paper on the hot stamping relief and the substrate Between; turn on the hot stamping machine to make the hot stamping heating element contact the hot stamping relief plate, and the substrate to be printed is deformed by heat during the hot stamping process and sags downward to form grooves; the hot stamping time is 3-60 seconds; the hot stamping temperature is 85-185°C ; The scale on the hot stamping relief plate is transferred to the bottom of the substrate groove along with the hot stamping paper to form a scale mark; the finished product is obtained. The advantage of the invention is that the scale accuracy of the measuring teaching aid can be improved by adopting a suitable hot stamping process. The scale accuracy of the measurement teaching aid can meet the requirements of QB / T1474.1-QB / T1474.7. The product obtained by the present invention is particularly suitable for professionals in various surveying and mapping, drawing and the like.

The invention discloses a method for preparing a copper indium gallium selenide film and a photovoltaic film battery based on a selenium plasma, comprising the following steps of: 1, ionizing work gas by an ion source to enable the work gas to be in a plasma state and providing the plasma in an evaporation source chamber; 2: evaporating a selenium material by using an electron gun to generate selenium stream in the evaporation source chamber; 3: enabling electron cloud generated by the work gas in the ionization process to mutually impact the selenium steam by connecting a crucible with positive bias to generate the selenium plasma; and 4. heating the plated substrate to the preset selenizing temperature and respectively evaporating copper, indium, gallium and selenide metal materials by using an evaporation source arranged in the evaporation source chamber in the selenium plasma atmosphere backpressure environment so as to deposit a copper indium gallium selenide photovoltaic film on the substrate. According to the method, the selenizing temperature of the copper indium gallium selenide film in the growing process is reduced, the ratio precision of various materials of the copper indium gallium selenide film is improved and the large-area preparation of the copper indium gallium selenide film is realized.

The invention discloses a powder output device capable of automatically controlling the discharge amount. The powder output device comprises a funnel-shaped powder cylinder and a feeding device communicating with the bottom of the powder cylinder. A mounting frame is mounted on the lower portion of the powder cylinder in a hoisting mode. One end of the feeding device is fixedly mounted on the mounting frame, and the other end of the feeding device is connected with a fixing frame and communicates with a mixing device. A tension sensor is mounted between the feeding device and the fixing frame. The mass of the feeding device is measured and controlled through the tension sensor, and the tension sensor can precisely control the powder conveying amount of the feeding device, improve the proportion precision of mixed powder and improve the quality of concrete production. The automation degree is high, the labor cost can be reduced, and resources are saved.

The invention discloses a correction method for aerial surveying and mapping images, which comprises the following steps: setting two reference points in a to-be-measured area, and measuring the horizontal distance between the two points; measuring idealistic distance between two final image points in a final image corresponding to a target scale according to the target scale and the obtained horizontal distance; carrying out aerial photography for to-be-measured area, butting the obtained images so as to obtain an integral original image of the to-be-measured area, and measuring the actual distance between two original image points; and calculating the ratio of the idealistic distance to the actual distance to scale the original image according to the ratio, so as to obtain the final image. Due to the adoption of the method provided by the invention, the image of the target scale can be obtained without conforming to the accurate aerial photography height, accordingly, the precision requirement for the aerial photography height is reduced, and the operation is simpler.