32results about How to "Small control deviation" patented technology

A device and a method for controlling a position of a lateral edge of a continuous web of a recording medium in a printer or copier provides that sensors are provided. Signals of the sensors are supplied to a control device which includes an actuator. The actuator changes the position of the lateral edge of the web.

The invention discloses a superheated steam temperature two-stage coordination, prediction and control method of a thermal power generating unit. The method designs a two-stage coordination and control algorithm and utilizes a GPC-P (generalized predictive control-proportion) cascade control strategy to respectively achieve the control of first-stage and second-stage desuperheating water spraying and enable the two-stage desuperheating water control to approximately decouple under the situation that a second-stage desuperheating water valve has adjusting allowance, accordingly the adjusting process of the first-stage desuperheating water spraying cannot cause the temperature fluctuation of the outlet of a last-stage superheater; and when the second-stage desuperheating water valve reaches an upper limit or a lower limit, makes full use of the adjusting allowance of the first-stage desuperheating water spraying to assist the second-stage desuperheating water spraying to control superheated steam temperature, and further reduces the deviation between a dynamic state and a steady state of the superheated steam temperature control, thereby improving the control performance of a system.

The embodiment of the invention provides an equipment control system based on blockchain. A method comprises the steps: equentially determining equipment control strategies corresponding to the current equipment state information according to the node participation sequence of each participation node through a pre-established blockchain, determining first project type information of a control project type matched with the equipment state information in a relative equipment control strategy; furthermore, according to the equipment control association condition between the control item type nodes matched with the equipment state information; determining a strategy execution process control curve; further determining second project type information; after the second project type information is combined, determining a target equipment control strategy from the equipment control strategies to carry out equipment control, so the integral state expression of the equipment control state and the differential expression between different project types are effectively considered, and the control deviation in the actual equipment control process is reduced.

The invention discloses an electric deviation-correcting device. The device comprises a front conveying belt, a rear conveying belt, multiple compression rollers, a drum, a case, a visual sensor, a parallel light source, a high-speed counter, an industrial computer and a PLC; the multiple compression rollers, the drum and the case are relatively and fixedly arranged; the case drives the drum to rotate and can also drive the drum and the multiple compression rollers to reciprocate horizontally; the visual sensor can detect the deviation of the edge of a sizing material from a center line under the assistance of the parallel light source and transmits the deviation to the industrial computer in real time; the high-speed counter feeds the position of the rear conveying belt back to the industrial computer in real time; the industrial computer arranges feedback information into a group of data, stores the data accumulatively and meanwhile transmits the data to the PLC; the PLC controls horizontal motion of the case according to the feedback data, so that the center line of the sizing material and the radial center line of the drum coincide to the largest extent in the winding process. The deviation is corrected in the winding process, the distance between a deviation-correcting control point and a winding point is made close, and the possibility that a deviation-correcting system is disturbed is lowered.

The invention relates to a denitration reductant adding control method based on time difference matching and a control device of the control method. By setting in-situ real-time test points, measuring corresponding parameters and depending on actual characteristics of a catalytic deoxidizing reaction of a denitration device, the time difference of flue gas from a flue gas flow speed and flow rate test point to an ammonia spraying region when the flue gas amount and the concentration of pollutants are changed, and the time difference between ammonia / air for spraying into a grating are mainly calculated, so that synchronous non-time-difference mixing is achieved; meanwhile, the flow speed of front nitric oxide and the flow speed of flue gas are taken as feedforward parameters, the concentration of sprayed and mixed nitric oxide and ammonia is taken as the feedback variable, the weight ratio of the feedforward to the feedback is reasonably set and adjusted, the reductant and the nitric oxide after mixed in flue gas react based on set efficiency before entering the denitration device, the amount of ammonia / nitrogen is rapidly and timely adjusted and matched and flexibly controlled under the working conditions such as various change amplitudes and wild fluctuations, the problem of adverse effects caused by the denitration device, a unit and the like is solved, and a significant effect of promoting pollution reduction is achieved.

The invention discloses an S-shaped stainless steel cabinet suspension. The S-shaped stainless steel cabinet suspension is characterized by comprising a supporting frame, a semicircular cover clip and a PVC seat clip; the supporting frame comprises a supporting body and fixing sheets, the fixing sheets protruding out of the supporting body are connected to the reverse corners of the two ends of the supporting body, multiple evenly-arranged through holes are formed in the supporting body to form cover clip grooves, the semicircular cover clip is connected to the supporting body in the manner that the clip heads at the two ends of the semicircular cover clip are clamped in the corresponding cover clip grooves, multiple evenly-arranged through holes are formed in the supporting body to form seat clip grooves, and the PVC seat clip is connected to the supporting body in the manner that elastic clips at the bottom are fastened to the corresponding seat clip grooves. By the adoption of the S-shaped stainless steel cabinet suspension, the through holes of the cover clip grooves are formed in the cylindrical stainless steel supporting body, the clip heads are arranged at the two ends of the semicircular cover clip, a fixing pipeline of the semicircular cover clip is clamped to the corresponding through hole of the cover clip groove and can be installed and stabilized conveniently, the supporting frame is fixed to a wall face through lead screws, and therefore adjustment and supporting are convenient.