53results about How to "Deep stability" patented technology

A method for double sampling loop negative feedback comprising: obtaining a low-frequency feedback signal from the output of the amplifier; obtaining a high-frequency feedback signal from part of the amplifier of which high-frequency phase shift is low, wherein two-ways sampling signals have the same amplifying phase; combining the two-ways sampling signals together using a series capacitor-inductor double signal combining circuit to form one signal, the signal having low phase shift at both high and low-frequency and being used for negative loop feedback. The invention also provides a double negative feedback amplifier using the method.

The invention discloses a pressing type powder actuated tool, which comprises a firing mechanism and a launching mechanism. The firing mechanism comprises a firing seat and a firing column arranged in the firing seat; the launching mechanism comprises a gun barrel, a gun barrel fixing sleeve, a gun barrel pressure spring and a firing pin; the gun barrel is slidably arranged at one end of the gun barrel fixing sleeve in a sleeving way; the other end of the gun barrel fixing sleeve is fixedly arranged on the firing seat in a sleeving way; the firing pin comprises a firing head, a rod body and a seat body; the firing head and the seat body are connected into a whole through the rod body; the firing head is located in the gun barrel; the seat body is located at the firing end of the firing column; the gun barrel pressure spring is arranged on the rod body in a sleeving way and is located between the gun barrel and the seat body. The pressing type powder actuated tool provided by the invention utilizes the integral type firing pin to replace a firing pin with a split type structure in the prior art, and a firing pin sleeve pipe is removed, so that the problem that drug residues easily enter a gap between the firing pin and the firing pin sleeve is solved, the service life of the powder actuated tool is greatly prolonged, the manufacturing cost of the whole powder actuated tool is reduced, and the whole structure of the powder actuated tool is simplified.

The invention discloses a binding agent for a blast furnace stemming and the blast furnace stemming. The binding agent is prepared from, by mass, 40-70 parts of coal tar distillation kettle substrate, 30-60 parts of novolac resin and 2-5 parts of surfactant, wherein a preparation method of the coal tar distillation kettle substrate is comprises the steps that coal tar is added to a high-temperature ceramic reaction kettle, heating and stirring are performed at the temperature of 230 DEG C for 1.5-2.5 hours, and the coal tar distillation kettle substrate is obtained after reaction and degassing. A blast furnace stemming material needs additional 12-17.5 parts of binding agent. The blast furnace stemming made from the binding agent and the blast furnace stemming material is environmentally friendly, smokeless and outstanding in durability effect, really protect refractory bricks at the lower portion of a tap hole, and accordingly the service life of a blast furnace is prolonged. The blast furnace stemming made from the binding agent and the blast furnace stemming material is high in sintering speed, is resistant to erosion and scouring, is environmentally friendly and smokeless, can completely replace imported products and has the important significance on supporting of energy saving and environmental protection of the iron-making industry in our country, prolonging of the service life of blast furnaces and technical progress.

The invention relates to a large-scale ingot casting method for preparing Ti-6Al-4V titanium alloy, the invention adopts multiple-time vacuum self-consuming smelting method on the basis of routine technique, adopts a 'constant speed' finished product smelting method and adopts smelting speed control parameters to control the technological parameters in the finished product smelting process.The invention is characterized in that the smelting speed control parameter is 20-32Kg / min; the real smelting weight is on-line measured each second or according to a set time and an instant smelting speed is the ratio of the real smelting weight and the measurement time interval; if the smelting speed is higher than a desired value, the smelting current is then reduced; if the smelting speed is lower than the desired value, the smelting current is then increased. By using the control method, temperature field can be controlled effectively, distribution coefficient can be optimized, stabilization ofthe from and depth of the melting bath can be assured, which make the ingot casting sequence and solidification process stable and controllable, and homogeneity of components of large-scale ingot casting can also be assured.

The invention relates to a transplanting device and method for seedlings in dry land. In the device, a traveling mechanism is arranged below the chassis, and the driving device transmits power through the transmission mechanism; The arc-shaped plates that can be opened and closed, the upper ends of several arc-shaped plates are hinged to the lower end of the tube, and the hollow conical head is connected to the tube; the seedling basket is located above the tube, and the gap of the seedling basket is located directly above the opening of the tube, It is used to place the roots of the seedlings, and the power output end of the transmission mechanism drives the planer-insert joint head and the lever to reciprocate up and down; in the method, the driving device transmits the power to the transmission mechanism, and the transmission mechanism drives the hollow conical head to move downward to complete the planing. The pit moves, and drives the lever to move downward, the seedlings fall from the seedling basket into the planer-plugging joint head; the arc-shaped plate opens the seedlings and falls into the pit, and the arc-shaped plate closes and the soil in the arc-shaped plate is sent back to the pit ; The operation is repeated to continuously transplant the seedlings.

The invention provides a method for chemical doping of plumbum (Pb) on the surface of a cathode carbon material used for an ultrabattery. The method comprises two steps of carbon material surface modification and Pb doping. The carbon material surface modification includes that carbon material undergoes a vulcanization reaction and / or an oxidation reaction. The Pb doping includes that the carbon material is placed into a solution containing Pb <2+> to be treated, and a treating mode is at least one chosen from vacuum soaking, ultrasound oscillation and high-temperature backflow. The method is simple and convenient to operate, achieves deep, uniform and mass doping of Pb elements in a microcosmic area of the carbon material by means of strong affinity of S and O to Pb and C, restrains hydrogen evolution of the carbon material under an acid-stage system, improves the volume of the carbon material, and enables the level of the hydrogen evolution of the surface of the carbon material under the acid-stage system corresponds to be equal to that of the surface of Pb. The method is suitable for industrialization application.