33results about How to "Proportional control" patented technology

Skateboard speed control is achieved by improved application of a mechanism to provide even force to the wheels by a simplified speed control system. The speed control system is durable, compact, simple, uses minimal components, is ergonomic, and has speed control pads that move in sync while simultaneously tolerating variations in wheel orientation and position while a rider is maneuvering the skateboard.

The invention relates to the technical field of welding, in particular to a preparation method for Sn based composite solder sheets. The preparation method comprises the following steps that S1, trepanned foam metal is subject to surface treatment; S2, filling of molten Sn based solder is carried out, specially, an infiltration manner is adopted for filling the foam metal with the molten Sn basedsolder, then foam metal sheets obtained after surface treatment are immersed into the molten Sn based solder, and the foam metal sheets are taken out after holes are filled with the solder; and S3, alternative stacking hot pressing treatment is carried out, specially, the foam metal sheets filled with the Sn based composite solder are alternatively stacked together, the stacked sheets are subjectto repeated hot pressing treatment, and finally the Sn based composite solder sheets are obtained. The preparation method has the beneficial effects that liquidity of the Sn based solder during brazing is guaranteed; the stacking layer number of foam Cu and foam Ni is changed, and the proportion of Cu to Ni in the composite solder sheets can be effectively controlled; and the strength and the hightemperature stability of a soldered joint are effectively improved.

The invention provides a carbon composite material, a preparation method thereof and an application thereof. The carbon composite material is composed of soft carbon and hard carbon. When the carbon composite material provided by the invention is used as a negative electrode current collector of a secondary battery, the advantages of the soft carbon and the hard carbon can be complemented, electrochemically active substances can be uniformly embedded, adsorbed or deposited in the carbon composite material, the destruction of the structures of the carbon material and the short circuit of the battery do not occur, and at the same time, the performance of a metal secondary battery can be improved. The carbon composite material not only provides space for metal deposition but also provides a space or passage for metal ion insertion, adsorption and extraction, and the storage capacity and cycle life of the secondary battery are improved. When the carbon composite material provided by the present invention is used as the negative electrode current collector of the secondary battery, the change of the original assembly process of the battery is not needed.

In the invention, polymer dielectric instead of liquid electrolyte is applied to lithium cell to produce cell in different shapes with performances of safety, lightweight and high energy density. In contrast, in prior art, there are disadvantages such as unstable liquid and bad mechanical properties in existed technique. Gel state inorganic-organic hybrid polymer dielectric is prepared through ultraviolet light radiation to trigger off polymerization. The polymer dielectric is amorphous in room temperature possessing features of high conductivity, stable thermal and mechanical properties. Advantages of ultraviolet light solidifying method are one-step molding, simple technique, high efficiency, no pollution. Performed polymer of inorganic-organic hybrid polymer is prepared by reconstructing end group after sol-gel reaction of alkoxyl silicon compound. In room temperature, ionic conductivity is reached to 8.4x10 to the power -3 Scm being close to conductivity of liquid electrolyte.

The invention provides a multi-coil electromagnetic heating system and method. The multi-coil electromagnetic heating system comprises a power source used for selectively providing ACs with different frequencies and at least two parallel working circuits, wherein the working circuits are respectively connected with the power source and comprise serially connected electromagnetic heating coils, capacitors and resistors; and the power source can output AC cowering the resonant frequency range of the working circuits. In the invention, no relay is required, the output power distribution ratio of the electromagnetic heating coils is changed by changing the frequency of the power source, the production cost is reduced, and the operation is simple and convenient.

The invention discloses light/heat double crosslinked hyperbranched polycarbosilane benzocyclobutene resin as shown in a formula (IV) and a preparation method thereof. The preparation method of the hyperbranched polycarbosilane benzocyclobutene resin comprises the following steps: generating a Grignard reagent from chloromethyltrichlorosilane under the action of magnesium; then performing a coupling reaction with Si-Cl to further form a hyperbranched Si-Cl bond-containing hyperbranched polycarbosilane polymer; adding 4-bromobenzocyclobutene to react; adding p-bromostyrene to react; then adding alkyl (alkenyl) halide to react; performing cooling; adding distilled water (deionized water) into the system for a quenching reaction; and performing solvent extraction, concentration, and purification steps such as distillation or column chromatography on silica gel to obtain the light/heat double crosslinked hyperbranched polycarbosilane benzocyclobutene resin. The light/heat double crosslinked hyperbranched polycarbosilane benzocyclobutene resin prepared by the method is excellent in thermal, electrical and photosensitive properties and is suitable for being used as a high performance dielectric film material or a packaging material in the field of microelectronics industry, space flight and aviation and national defense and the like. The formula (IV) is as shown in the specification.

The invention provides a gas mixer applicable to low-pressure gas. The gas mixer comprises a jet mixer and a fan, wherein a mix gas outlet of the jet mixer is connected with the inlet of the fan; the gas mixer further comprises a venturi jet pipe and a mixer shell; a nozzle of the venturi jet pipe is located in the mixer; the mixer shell is provided with an air inlet pipe which forms an angle of 90 degrees with the venturi jet pipe. The gas mixer provided by the invention takes negative-pressure and low-pressure gas of the inlet of the fan as driving forces; a venturi principle is used for sucking second gas to be mixed. The device is simple in structure, low in production cost and simple in control, and can effectively and uniformly mix two types of gas.

The invention discloses a supercharger test bench combustion chamber air inflow proportion adjusting device. The device comprises a control device; a gas detector arranged at the outlet of the combustion chamber; a stepping motor, in control connection with the control device and controlled by the control device; a crank-link mechanism, the power input end of the crank-link mechanism being connected with the output shaft of the stepping motor; a driving gear, connected with the power output end of the crank-link mechanism; a gear transmission mechanism, the power input end of the gear transmission mechanism being in driving connection with the driving gear; a plurality of driven gears, in driving connection with the power output end of the gear transmission mechanism; and air guide wheelblades, coaxially connected with the driven gears and are driven by the driven gears to deflect. The invention further discloses a supercharger test bench combustion chamber air inflow proportion adjusting method. According to the invention, the ratio of primary air to mixed air in the combustion chamber can be adjusted, so that the effect of fully combusting fuel is achieved.

The invention provides a self-cured metal anti-corrosion hybrid silica sol, and a preparation method and application thereof. The hybrid silica sol contains a compound represented as in a formula I, wherein x, y, n and m are all integers, and R<1>, R<2>, R<4> and R<5> are alkyl groups and can be same or different.

The invention relates to a method for analyzing short-term temperature fluctuation, which comprises the following steps of: collecting a multi-year day-by-day temperature sequence of a certain place,respectively calculating the temperature difference between the daily temperature and the first day in the time length by taking data in the length of a research time period to form a difference group, and forming a plurality of difference sequences on the basis of data of the multi-year corresponding difference group, sorting the difference value sequences according to the size, and calculating upper and lower thresholds; and judging the size relation between the corresponding difference value group every day and the upper and lower thresholds of the corresponding difference value sequence, so that whether air temperature fluctuation occurs in the length of the research time period can be judged. According to the method, the length of the research time period and the threshold proportionof fluctuation can be freely defined, the influence of seasonal change on temperature fluctuation is eliminated, the day-by-day temperature fluctuation amplitude and the fluctuation frequency in the time period can be obtained, and the fluctuation direction can be indicated by the positive and negative of the fluctuation amplitude index.

The invention provides titanium and alloy of the titanium with a bone promoting effect as well as a preparation method and application of the titanium and the alloy of the titanium. The surface-modified titanium and an alloy material thereof comprise the titanium or a titanium alloy material and a magnesium-iron layered double-metal hydroxide film formed on the surface of the titanium or the titanium alloy material. The surface-modified titanium and the alloy material thereof have good microenvironment alkalinity regulation performance, biocompatibility and bone induction capability.

The embodiment of the invention discloses a hydrogen-oxygen mixed gas generating device and method, and the generating device is used for generating hydrogen-oxygen mixed gas and comprises a first electrolytic cell and a second electrolytic cell; water is introduced into the first electrolytic cell for primary electrolysis to generate hydrogen with the content of a1 and oxygen with the content ofb1; and hydrogen generated by the first electrolytic cell and wet air are introduced into the second electrolytic cell for secondary electrolysis, hydrogen with the content of a2 and oxygen with the content of b2 are generated, wherein the content of oxygen in the wet air is b3, the hydrogen-oxygen mixed gas is composed of hydrogen and oxygen, the volume percentage of the hydrogen is A, the volumepercentage of the oxygen is B, a1+a2=A, b2+b3=B, and B=20%-21%. The hydrogen-oxygen mixed gas generated by the electrolysis device contains hydrogen and oxygen, the electrolysis device not only has the function of a hydrogen breathing machine, but also can generate oxygen with the same oxygen content as air, and can meet the requirement of a human body on oxygen.

The invention discloses a double-phase organic-inorganic hybrid silica, and a preparation method and applications thereof. The double-phase organic-inorganic hybrid silica comprises organic-inorganichybrid silica sol and amino silica sol, and the organic-inorganic hybrid silica sol contains a compound represented by formula I, wherein in the formula I, x, y and m are integers, and R1, R2 and R4 are alkyl groups, and R1, R2 and R4 can be the same or different groups.

The invention discloses an intelligent proportioning device for livestock breeding. The device comprises a box body and stand columns, wherein the stand columns are mounted at four corners of the bottom of the box body; a feed trough is mounted in an inner cavity in the bottom of the box body; multiple ejection blocks are mounted on the outer wall of each roller, a clamp ring is mounted on the outer wall of the bottom of each ejection block, nuts are mounted on the left side and the right side of the bottom of the clamp ring and connected with the inner wall of the roller, and bolts are mounted on the left side and the right side of the top of the clamp ring and penetrate through the clamp ring and the nuts. According to the intelligent proportioning device for livestock breeding, a motordrives the rollers to start to rotate, so that the ejection blocks circularly eject support plates, and feed ratio is more accurate; the bolts are twisted to be withdrawn from the nuts, then the ejection blocks can be taken down from the rollers, by the aid of the mode, the ejection frequency of second channel steel in each cycle is changed, therefore, outflow volume of the raw materials is changed, and the feed ratio is controlled.

The invention relates to the technical field of sulfuric acid production industrial equipment sealing structures, in particular to a sealing system for a sulfur dioxide fan. The technical problems in the prior art that due to the fact that a sulfur dioxide gas leaks from a negative pressure end of a centrifugal multi-stage impeller sulfur dioxide fan, the total content of sulfur dioxide entering conversion is low, and effective compensation of the gas amount cannot be achieved are solved, and a sealing device is connected to a suction end shell of the sulfur dioxide fan to serve as a seal of a suction end rotor. A backflow pipe set is connected with the sealing device and a fan multi-stage impeller chamber and receives the negative pressure formed by guiding of the fan multi-stage impeller chamber. A control unit is used for controlling the opportunity that the backflow pipe set is guided by the fan multi-stage impeller chamber to form the negative pressure. The system has the advantages that the leakage amount of sulfur dioxide can be effectively reduced, the effective compensation total gas amount can be formed, an external medium does not need to be introduced, the impact on a production system is small when the gas amount is compensated, control over the process gas proportion is facilitated, and energy conservation and environmental protection are achieved.