32results about How to "High precision of automatic control" patented technology

The invention relates to the technical field of automatic control, in particular to an automatic coal gas station load control system. The control system comprises a high-pressure coal gas pressure control loop, a low-pressure coal gas pressure control loop and an amplitude limiter. After a low-pressure coal gas pressure set value and actual pressure data collected by a low-pressure coal gas pressure transmitter are subjected to comparison operation through a low-pressure coal gas pressure regulator, a signal is outputted to a blower frequency converter, a blower is controlled to regulate air volume to further control pressure of a low-pressure coal gas main, meanwhile the low-pressure coal gas pressure transmitter transmits measured low-pressure coal gas pressure information to the high-pressure coal gas pressure control loop through the amplitude limiter, pressure regulation of the high-pressure coal gas pressure control loop is subjected to amplitude limitation, the two control loops restrict each other during pressure regulation, safety in the whole control process is guaranteed, potential risk that the low-pressure coal gas pressure is ultrahigh and ultralow due to frequent change of coal gas demand of users is eliminated, and stable regulation of coal gas production is realized.

The invention relates to a steel wire heat treatment open-fire heating furnace with a column combined type preheater. The preheater is arranged in a smoke discharging flue and comprises a hot air tank and a cold air tank, which are communicated through a connecting vent pipe, and the hot air tank and the cold air tank are respectively partitioned into multiple chambers by partition boards. Each chamber of the hot air tank is respectively communicated with each chamber of the corresponding cold air tank through the connecting vent pipe, each chamber of the hot air tank is respectively providedwith a hot air pipe, and each hot air pipe is communicated to each section of the open-fire heating furnace. Each chamber of the cold air tank is respectively provided with a cold air pipe, each coldair pipe is communicated with a cold air header pipe, and a cold air valve is arranged on each cold air pipe. In the invention, the air quantity of each working section of the open-fire heating furnace is controlled by adjusting the air quantity entering each cold air pipe of the preheater, and the cold air valve works at normal temperature, is easy to realize automatic control and has high automatic control accuracy. The utilization rate of heat energy is high, the thermal stability of the furnace is good, and produced steel wires have good quality.

The invention relates to the technical field of self-adhesion aluminum-plastic composite foil, in particular to production equipment of self-adhesion aluminum-plastic composite foil. By means of the combination design of an adhesive coating unit, an extrusion melting unit and a tape-casting laminating unit, the problems that existing production equipment for self-adhesion aluminum-plastic composite foil is single in function, production of aluminum-plastic foil and self-adhesion films can not be controlled, consequently, the production cost is difficult to control, and produced self-adhesion aluminum-plastic composite foil is thick are solved.

The invention provides a steel plate production method, a device and a control system for steel plate on-line solution, and belongs to the technical field of metallurgy. According to the method, excess rolling heat after a steel plate is rolled is utilized to perform on-line solution treatment on the steel plate to obtain a specific steel plate microstructure and various properties in line with product requirements, so as to reduce carbon emission and lots of energy consumption during secondary heating of off-line heat treatment. The device for production and the control system are less in investment; and the cooling device is compact and high in cooling rate, can save energy, can cool steel plates with a wide thicknesses specification range in a controlled manner, is high in automatic control precision, makes a cooled steel plate good in shape, not only can be used in steel plate on-line solution treatment, but also can be applied to a process needing rapid cooling after rolling, even an off-line quenching process.

The invention provides a basic automatic rolled steel plate rapid cooling system for online solid solution treatment and belongs to the technical filed of metallurgy. The basic automatic rolled steel plate rapid cooling system comprises a basic automatic system body which is provided with a rapid cooling water treatment system and a hydraulic system and can be used for online solution treatment of steel of relevant types. According to the basic automatic rolled steel plate rapid cooling system, through the arrangement of the reasonable basic automatic system body provided with the water treatment system and the hydraulic system, full-automatic accurate control over the cooling process is achieved. According to the basic automatic rolled steel plate rapid cooling system for online solid solution treatment, the investment is small, a cooling device is compact and capable of saving energy, the cooling rate is high, the range of the thicknesses of steel plates which can be cooled in a controlled mode is wide, the automatic control precision is high, and the plate shape after cooling is good.

The invention discloses a direct current micro voltage / micro current detection device and a detection method thereof. The detection device comprises an oscillation circuit, a digital signal amplifying circuit, a subtractor and a numerical value scaling unit, wherein the oscillation circuit comprises a first voltage-controlled oscillator and a second voltage-controlled oscillator, the parameters of the first voltage-controlled oscillator and the second voltage-controlled oscillator are the same, the input of the first voltage-controlled oscillator is connected with the output end of a signal to be detected or is grounded, the input of the second voltage-controlled oscillator is grounded or is connected with the output end of the signal to be detected, the output of the first voltage-controlled oscillator and the output of the second voltage-controlled oscillator are respectively connected with the input of the digital signal amplifying circuit; the output of the digital signal amplifying circuit is connected with the input of the subtractor, and the output of the subtractor is connected with the input of the numerical value scaling unit. The method comprises the following steps: the detection device respectively converts an input signal into oscillation frequencies by the first voltage-controlled oscillator and the second voltage-controlled oscillator, and amplifying, subtracting and conversion are carried out, so as to judge whether a direct current micro voltage or direct current micro current is input or not.