8results about How to "Reduce control precision requirements" patented technology

The invention discloses an efficient and low-cost production method of thin-specification and high-grade non-oriented silicon steel. The production method comprises the steps that the initial rolling temperature of hot rolling and finish rolling is larger than or equal to 950 DEG C, the finish rolling temperature is (830-880) + / -15 DEG C, and the coiling temperature is (600-650) + / -15 DEG C; acid continuous rolling, wherein a multi-rack acid continuous rolling unit is adopted for acid pickling and multi-pass cold rolling; normalizing a rolled hard board, wherein the normalizing temperature is (850-1000) + / -10 DEG C, and the tension in a normalizing furnace is 8-10N / mm < 2 >; performing single-stand finish cold rolling: performing finish cold rolling by adopting a single-stand rolling mill; and annealing, wherein the annealing temperature is 850-1050 DEG C, and a finished product with the thickness of (0.15-0.50) + / -0.003 mm is obtained. A specific process combination of normalizing after obtaining a rolled hard plate through acid continuous rolling and then carrying out single-rack finish cold rolling is adopted, so that the existing hot-rolled plate normalizing technology is replaced, and the unification of high efficiency, low cost and high quality is achieved.

This invention relates to a tail fin structure with independent pitch and roll movements, comprising a pitch mechanism, a roll mechanism, and a connecting mechanism. The pitch mechanism includes a pitch servo and a pitch linkage, while the roll mechanism includes a roll servo and a transmission gear. The connecting mechanism includes a universal joint and a universal joint limiter. The pitch servo drives the tail fin to pitch movement via the pitch linkage. The roll servo drives the universal joint to rotate via the transmission gear, with the tail end of the universal joint connected to the tail fin to complete the roll movement. The rotation center of the pitch mechanism coincides with the center of the universal joint, and the left and right swing degrees of freedom of the universal joint are limited by the universal joint limiter, achieving independent control of pitch and roll movements. This invention allows for completely independent roll and pitch movements, significantly reducing the control precision requirements of the motor. The invention has a simple structure and reasonable design. The single-plane tail fin structure of this invention has strong wind resistance during flight and also has advantages such as low inertial load on the motor and high drive efficiency.

The invention discloses an elevator secondary leveling operation control method which comprises the following steps: S1, when an elevator is in a deceleration operation state, monitoring a speed instruction output by an elevator control system; s2, when the speed instruction is zero, the height difference between a car floor and a floor sill is obtained; s3, when the height difference is larger than a trigger threshold value, a door lock loop is short-circuited; s4, calculating a secondary leveling operation speed instruction according to the height difference; and S5, secondary leveling operation is executed. According to the method, the requirement for the control performance in the deceleration process is low, and the leveling precision is high.

The embodiment of the invention provides a through hole forming method of a package substrate, relates to the field of semiconductor processes, and mainly solves the problems of low etching speed, low hole forming efficiency or poor hole forming process in the existing through hole process of the package substrate. The method comprises the following steps: defining a through hole position on a packaging substrate; forming a first electrode at the position of the through hole in the first surface and forming a second electrode at the position of the through hole in the second surface by adopting a mask; pre-discharging the first electrode and the second electrode to form an electric breakdown area at the position of the through hole; removing the first electrode and the second electrode; reusing the mask, forming a first mask layer on the first surface, exposing the positions of the through holes by the first mask layer, and forming a second mask layer on the second surface, exposing the positions of the through holes by the second mask layer; and through the first mask layer and the second mask layer, etching to remove the electric breakdown region at the position of the through hole so as to form the through hole. Porous batch discharge is supported, and the discharge machining efficiency is greatly improved.

The directional drilling and reaming device of the trenchless drilling machine comprises a reamer body, a cutter shaft is installed in the middle of the reamer body, the front end and the rear end of the cutter shaft are fixed to the peripheral face of the reamer body, a spiral blade is fixedly arranged on the peripheral face of the cutter shaft, and a cutter relieving groove is formed in the peripheral face of the middle of the reamer body. A reinforcing rib plate is arranged on the peripheral surface of the cutter shaft, a soil crushing inclined surface facing the front end of the reamer body is arranged on the outer side surface of the reinforcing rib plate, and a plurality of crushing teeth are fixedly arranged on the soil crushing inclined surface; the fixed type composite cone structure composed of the cutter shaft and the crushing teeth is adopted, due to the fact that the fixed type composite cone structure cannot move autonomously, fine control requirements are not needed, the fixed type composite cone can correctly cut into a bottom layer and keep stable in the drilling period along with a drill bit, and compared with an existing movable cone, the requirement for control precision of operators is lower.

The invention discloses a floating type inflation and deflation connector and a restraining tray inflation and deflation device, the inflation and deflation connector comprises a base, the base comprises a first end and a second end, the first end is provided with a butt joint used for being connected with an air nozzle, and an air channel communicated with the butt joint is arranged in the base; the base is further provided with a first ventilation opening communicating with the air channel. And the fixing seat is connected with the second end of the base through a floating connector so that the base can float in the multi-axis direction relative to the fixing seat, and the fixing seat is used for installing and fixing the base. Based on the inflation and deflation connector, when the butt joint on the base is in butt joint with the air tap, the base floats under the action of butt joint force so as to adapt to the position error and contact pressure between the air tap and the butt joint. Based on the inflation and deflation connector, the air tap and the butt joint are in flexible butt joint, and therefore the requirement for the control precision of the butt joint and the air tap is effectively lowered on the premise that accurate butt joint between the butt joint and the air tap is guaranteed.

The utility model discloses a temporary storage plate, a temporary storage frame, a goods shelf and a warehousing system.The temporary storage plate comprises a plate body, a first guide structure extending in the width direction of the plate body and a second guide structure extending in the length direction of the plate body are formed on the plate body, and the first guide structure is located at the end, in the length direction of the plate body, of the plate body; a first guide inclined plane is formed on the first guide structure, and a second guide inclined plane is formed on the second guide structure; a supporting face is formed on the plate body and located on one side of the second guiding structure, and obtuse angles are formed between the first guiding inclined face and the supporting face and between the second guiding inclined face and the supporting face. According to the temporary storage device, the first guide inclined plane and the second guide inclined plane which are arranged on the temporary storage plate can be used for guiding the material box to be accurately placed in the temporary storage position, and the requirement for control precision of carrying equipment is lowered.

An ophthalmic measuring system with an optical path compensation deflection mechanism comprises an OCT light source, a reference arm, a sample arm module, an optical fiber coupler, a detector and the optical path compensation deflection mechanism. The sample arm module comprises a light path switching scanning device which can reflect detection light to a posterior segment or anterior segment light path. The optical path compensation deflection mechanism comprises a rotating mechanism and an optical path compensation deflection assembly. According to the mechanism, the optical path can be dynamically adjusted, the A-Scan optical path or phase change is kept constant, the Doppler frequency shift effect is simulated, and hardware cost does not need to be increased. The system can avoid using a carrier frequency adding technology in a preview stage, so that sampling requirements are reduced, and the cost is reduced. During measurement, shallow detection depth is adopted, the to-be-measured eye is quickly aligned, and the accuracy is improved. Fast switching of scanning modes allows for accurate measurement of ocular axial length, anterior chamber depth, and lens thickness. The invention provides an ophthalmology OCT imaging solution which is high in cost benefit, easy and convenient to operate and accurate in measurement, and the clinical diagnosis requirement is met.