6results about How to "The method is simple and reliable" patented technology

This invention relates to a method for refining and classifying coking coal based on petrographic and matrix strength, comprising: determining the petrographic composition of the coking coal; placing the prepared sample in a dry distillation reactor for dry distillation reaction; pulverizing; taking a sample with a weight of M0 and placing it in a type I rotary drum for a rotational experiment, then sieving and recording the weight of coke particles larger than 0.2 mm as M1; calculating the matrix strength I. cb = (M1 / M0)*100%; based on the vitrinite content V and matrix strength I in the coal and petrographic composition. cb This invention enables the detailed classification of coking coal. It can quickly distinguish between coking coal types with similar conventional coal quality indicators and further classify them, providing a reliable basis for coking coal quality evaluation and blending guidance. The method is simple, reliable, low-cost, and timely, making it suitable for coal and coking enterprises and possessing broad application value.

This invention relates to a method for calculating the input and output power of a permanent magnet wind turbine after demagnetization, and pertains to the field of permanent magnet wind turbine control technology. The method includes: obtaining the first and second average electromagnetic torques of the permanent magnet wind turbine under rated current, both before and after short-circuit demagnetization, and calculating torque loss; dividing the wind speed range of the generator's operation after short-circuit demagnetization into a first wind speed range and a second wind speed range based on the torque loss; calculating the input and output power of the generator in the first and second wind speed ranges based on the torque loss; concatenating the obtained input and output power to obtain the input and output power curves of the generator across the entire wind speed range after short-circuit demagnetization; and controlling the permanent magnet wind turbine based on the input and output power curves. This invention solves the problem of maximizing the output power of a permanent magnet wind turbine while ensuring reliability, thereby ensuring maximum power generation.

A bridgeless Cuk power factor correction topology circuit and its control strategy are disclosed. The circuit includes an AC voltage source, a filter energy storage module, a bridgeless rectifier module, a power frequency ripple coupling module, a buck filter module, and an equivalent load RL. This circuit uses transistors instead of traditional rectifier bridge diodes, reducing the number of components and solving the problem of high conduction losses in traditional diodes. It also offers advantages such as reduced power consumption and high reliability, improving the efficiency of the Cuk PFC converter. Furthermore, based on the bridgeless Cuk power factor correction topology circuit, this invention proposes a simple and easy-to-implement dead-time control strategy and a zero-crossing control strategy, ensuring the integrity of the inductor freewheeling path. Compared to traditional totem-pole bridgeless PFC converters, it has lower requirements for controller performance and better robustness.

The application relates to a kind of calculation methods of turbine admission end regulating linearity, the difference of the termination value and initial value of the comprehensive valve position instruction in nearly 5min is calculated, the linearity k basic value of the comprehensive valve position interval to which it belongs is obtained according to the comprehensive valve position instruction value at termination and initial k , how to use linearity to evaluate the overall operation characteristics of high regulating valve is given, and abnormality is found in time to guide operation personnel to handle. The method is simple and reliable, high accuracy, strong practicability, which can be used in online monitoring system of thermal power plant and other digital systems, continuously monitors linearity, reduces the monitoring pressure of operation personnel, and improves work efficiency.

This invention discloses a method for verifying the strength of a deck beam. The method involves: determining the working condition under which the beam experiences the target maximum bending moment based on the vehicle spacing 'a' and the span length 'l' of the deck beam, i.e., determining the number of wheel loads and the position of each wheel; calculating the target maximum bending moment by substituting the parameter 's' characterizing the wheel position into the corresponding formula; comparing the calculated target maximum bending moment with the beam's ultimate bending moment; if the calculated target maximum bending moment is less than the beam's ultimate bending moment, the beam strength meets the design requirements; if the calculated target maximum bending moment is greater than or equal to the beam's ultimate bending moment, the beam strength does not meet the design requirements. The beneficial effects of this invention are: it provides a method for verifying the strength of a deck beam, provides corresponding calculation formulas, and provides a method for determining wheel load working conditions.

The utility model discloses a kind of oil collecting plates, including oil collecting plate body, still including the two-axis reverse gear oil guide groove of installing in the bottom of oil collecting plate body one side and the two-axis gear oil guide groove of installing in the bottom of oil collecting plate body other side;The two-axis reverse gear oil guide groove is arranged by the edge of oil collecting plate body to center inclination, the two-axis gear oil guide groove is arranged by the edge of oil collecting plate body to center inclination.The oil collecting plate provided by the utility model, by setting two-axis reverse gear oil guide groove and two-axis gear oil guide groove collection two-axis reverse gear and two-axis gear oil splashing of oil liquid and the oil liquid collected is transported to bearing, so that roller bearing is fully lubricated, greatly reduce the failure rate of this bearing.The oil collecting plate provided by the utility model, integrally stamping molding, improve the strength and accuracy of component whole, shorten technological process, significantly improve the efficiency of manufacturing and processing, reduce manufacturing cost.