5results about How to "Increase inhomogeneity" patented technology

The utility model relates to PLC control system technical field, and disclose a kind of anti-interference equipment based on PLC control system, including anti-interference box, the inside fixed connection of anti-interference box limit block, the bottom of anti-interference box is equipped with air cooling equipment, air cooling equipment adjusts the temperature inside anti-interference box, the inside of limit block is connected with mounting frame, the inside of mounting frame is movably sleeved with transverse plate.This anti-interference equipment based on PLC control system, through rotating pipe sleeve is connected in the inside of gas transmission pipe, ventilation pipe drives gas transmission to the inside of rotating pipe, while rotating pipe rotates at uniform speed, when the hole opened in the inside of gas transmission pipe and rotating pipe coincides, it can drive gas to blow to the inside of anti-interference box and carry out heat dissipation treatment, and rotating pipe can drive gas intermittent transmission when rotating, improve the flow and unevenness of gas in the inside of anti-interference box, improve heat dissipation effect.

This invention provides a high-performance polyacrylonitrile fiber and its preparation method. The high-performance polyacrylonitrile fiber includes a steam drawing step. In the steam drawing step, the tension of the fiber bundle after steam drawing and the steam drawing pressure satisfy the following relationship: -10x + 4651 ≤ y ≤ -16x + 6976; where x is the steam drawing pressure, x is 150–380 kPa; and y is the tension of the fiber bundle, in cN. The preparation method includes: wet spinning extrusion of polyacrylonitrile dope, coagulation molding, hot water drawing, washing, oiling, drying and densification, steam drawing, steam heat setting, and winding to obtain the high-performance polyacrylonitrile fiber. This invention solves the problems of high fiber strength CV value after steam drawing and high fuzziness during heat setting in the prior art.

The invention discloses a forging test-based method for forging bearing steel for a wind power main shaft bearing, which comprises the following steps of: under different forging process parameters, carrying out forging tests on a plurality of bearing steel forgings and detecting and evaluating after the forging tests to obtain optimized forging process parameters; according to different bearing application occasions and working conditions, weight coefficients alpha, beta and gamma of three detection items A, B and C for forging performance evaluation are set, and a forging performance evaluation formula M = (alpha * A + beta * B + gamma * C) / (A + B + C) is established; wherein M is a forging performance comprehensive evaluation value based on weight consideration, and the test forging heating temperature and the test post-forging heat treatment temperature corresponding to the detection sample with the maximum M value serve as forging process parameters during forging of the bearing steel for the wind power main shaft bearing. The forging performance of the bearing steel for the wind power main shaft bearing is improved, the cost of a forging test is reduced, and the period of the forging test is shortened.

The invention belongs to the technical field of piezoelectric materials, and particularly relates to a lead-based ferroelectric crystal material with a high piezoelectric figure of merit and a preparation method and application of the lead-based ferroelectric crystal material, the chemical formula of the material is xPb (Ho1 / 2Nb1 / 2) O3-(1-x-y) Pb (Mg1 / 3Nb2 / 3) O3-yPbTiO3, x and y represent mole fractions, x is larger than or equal to 0.002 and smaller than or equal to 0.02, y is larger than or equal to 0.28 and smaller than or equal to 0.30, and the piezoelectric figure of merit d33 * g33 of the lead-based ferroelectric crystal material is larger than 160 pm < 2 > / N. Compared with a reported lead-based perovskite ferroelectric material, the lead-based ferroelectric crystal material disclosed by the invention has a higher piezoelectric figure of merit and has potential advantages in the aspects of manufacturing sensors and piezoelectric energy collectors.

The utility model relates to a magnetic ore dry separator which comprises a driving wheel, a magnetic roller, a dry separation belt, a feeding hopper and a driving device, the feeding hopper is arranged above the dry separator, the magnetic ore dry separator is characterized in that the driving wheel is arranged below the magnetic roller, and the diameter of the driving wheel is smaller than that of the magnetic roller; the magnetic roller is composed of an outer roller body and an inner magnetic system assembly, and the inner magnetic system assembly and the outer roller body are connected in a relatively rotating and sleeving mode. The internal magnetic system assembly is composed of a center transmission shaft and a 360-degree circumferential magnetic system fixedly connected with the center transmission shaft, and the 360-degree circumferential magnetic system is composed of strong magnetic rare earth permanent magnets and weak magnetic ferrites which are arranged in a crossed mode. The magnetic separator has the advantages that the diameter of the driving wheel is smaller than that of the magnetic roller, so that more effective magnetic separation area on the surface of the magnetic roller can be utilized, the magnetic overturning times of magnetic mineral particles adsorbed on the magnetic roller are increased, and the separation efficiency is improved.