4results about How to "Reduce grinding" patented technology

The invention discloses a positive active material and a preparation method thereof, a positive pole piece and a battery, the positive active material comprises: a matrix, the matrix comprises a lithium iron phosphate material; the surface of the matrix is at least partially coated with the carbon coating layer; the change rate b of the cell parameter b value of the positive electrode active material in a 4.2 V charging state and a 2.5 V discharging state satisfies 0.2% lt; blt; 4%; wherein b = (b1-b2) / b1 * 100%, b1 is the b value of the positive electrode active material in a discharge state from 4.2 V to 2.5 V, and b2 is the b value of the positive electrode active material in a 4.2 V charge state. Therefore, the positive electrode active material has a stable crystal structure and relatively high compaction density, and the battery prepared from the positive electrode active material has relatively high energy density and excellent low-temperature performance.

This invention is a steel billet grinding process with a constant grinding wheel linear speed. First, the steel billet is automatically fed, positioned, and locked. A laser rangefinder detects the actual length of the steel billet and calibrates the grinding wheel to align with the billet's length center. Then, the grinding wheel is controlled to apply pressure and adhere to the steel billet, driving the billet to translate and complete the grinding of both sides. During the grinding stage at the billet's ends, the speed and pressure are automatically reduced to avoid over-grinding and sharpening at the ends. A trolley tilting mechanism rotates the billet 45° multiple times, cyclically grinding all sides and edges of the billet, using a repeated grinding method with decreasing feed depth to ensure grinding accuracy. Simultaneously, photoelectric switches on both sides of the grinding wheel monitor the wear on the outer circumference of the grinding wheel in real time, dynamically adjusting the grinding wheel motor speed to maintain a constant grinding linear speed, and simultaneously calibrating the distance between the grinding wheel and the billet to stabilize the grinding pressure. This invention effectively ensures uniform overall grinding quality of the steel billet and improves the grinding accuracy and stability of the billet's sides and edges.

This invention relates to the field of wheat milling technology and proposes a wheat milling device, comprising: a fixed box having a first feed inlet, a second feed inlet, and a discharge outlet on the lower part of its circumferential side; a milling assembly, with a first grinding roller and a second grinding roller located around a main roller, the first grinding roller positioned above the second grinding roller, the first feed inlet opposite to the feed position of the first grinding roller, and the second feed inlet opposite to the feed position of the second grinding roller, the material being discharged between the first grinding roller and the main roller and then entering the feed position between the second grinding roller and the main roller; a screen covering the outside of the fixed box, the material ground by the milling assembly entering the screen from the discharge outlet; a rotating ring rotatably disposed between the fixed box and the screen, the rotating ring having a scraper, one side of the scraper sliding against the inner side of the screen, the material on the scraper falling into the second feed inlet after the scraper rotates to the upper side. This technical solution solves the problem of low working efficiency in multi-stage milling in existing technologies.

The application provides an assembly process for reinforcing a target machine, relates to the technical field of composite material target machine body assembly, and comprises the following steps: the assembly process is used for assembling the reinforcing target machine through an assembly tool, the assembly tool comprises a lower fixing device, an upper fixing device, a mold closing device, a wing positioning device, a horizontal tail positioning device and a fuselage limiting device, and the assembly process comprises the following steps: pretreating the upper fuselage skin and the lower fuselage skin after demolding; positioning the lower fixing device and the fuselage limiting device through positioning pins, connecting them through bolts and reserving a 5mm clamping gap, and placing the pretreated lower fuselage skin into the lower fixing device. The application provides an assembly process for reinforcing a target machine, effectively reduces the total artificial consumption in the assembly process, has high overall strength and high use reliability, and does not need subsequent secondary grinding.