CUT PICK CUT LINE DISTRIBUTION AND THE FINDINGS OF A STUDY OF LOAD SPECTRUM

According to studying Angle cutting conditions of shearer drum cutting teeth distribution on the influence law of load spectrum,which provides reference for the design of the cutter tooth,in which equivalent test tooth holder to roll the same spiral blades cut line cut tooth load the real-time online monitoring,synchronous export analysis after storage.Experimental results show that the system is reliable,stable performance,can real-time dynamic testing of cutter tooth cutting force changes,through different cut line cut tooth time-cutting force change curves available:cutting force curve variation rule has the similarity,oblique cutting coal and rock,drum cutting tooth load whole curve peaks and troughs alternating form,cutting teeth with different cutting depth change of cutting force changing process;Same cutting resistance of greater than its feeding resistance,but its fluctuations are similar,have many irregular fluctuations;Single pick on the cutting resistance and traction resistance of instantaneous value obey the symmetry good Gamma distribution,the distribution parameters with pick in the cutting line spacing end plate distance relationship is a Fourier series,for the research on the rules of cutter tooth load spectrum provides a new method

ANALYSIS ON THE INFLUENCE OF THE LOAD THE END PLATE OF THE DRUM SHEAER

For the study of coal winning machine end plate load characteristic of cutting pick,with MG500 type coal winning machine roller as the research object,USES the nonlinear dynamics simulation software ls-dyna screw drum of shearer and the finite element model of coal and rock was cut,the model was used to study the working condition of oblique bottom plate and mechanical characteristics of cutting pick load characteristics changing with the installation parameters. Research shows that:the oblique cut into the cutting process,the end plate cutting pick cutting resistance and cutting resistance moment with end plate cutter tooth circumferential tangential decreases with the increasing of the installation Angle,with the side plate cutter pick intercept increases; The eigenvalues of the drum cutting resistance moment with the increase of the circumferential tangential installation Angle of the decreasing trend with the slow,along with the increase of intercept its increasing trend also increases;For the roller with good cutting performance,end plate cutter tooth appropriate chooses the larger circumferential tangential installation Angle and low intercept

STUDY ON VIBRATION CHARACTERISTICS OF THE POLYGON EFFECT OF SCRAPER CONVEYOR

Scraper conveyor chain and chain gear transmission as the research object,analysis of the scraper conveyor load and no-load conditions chain dynamics,and numerical simulation of the scraper conveyor special point chain speed and tension are simulated. The results showed that: the most important parameter of the chain is the number of sprocket teeth,and the running stability of the scraper conveyor is proportional to the number of sprocket teeth,13 tooth sprocket stability is far stronger than 9 tooth sprocket scraper conveyor; polygon effect there side impact load on the chain tension fluctuation significantly higher than the no-load side; the reaction sensitivity of polygon effect is inversely proportional to the length of the chain length of the scraper conveyor and sprocket selection provides a theoretical basis,and to Study on dynamic characteristics of research methods and provides a theoretical basis

MACHANICAL ANALYSIS AND SIMULATION STUDY ON THE MIDDLE GROOVE CONNECTION SYSTEM OF SCRAPER CONVEYOR

In this paper,the central groove scraper conveyor connecting system as the research object,the mechanics model of middle groove connection system different postures,and were to push the slide and Lycra two kinds of stress conditions in central groove connection system were analyzed. ANSYS software simulation analysis of its static strength and fatigue life,results showed that the central groove connection system weakest place in the passage of the ear and dumbbells fossa,fossa stress concentration dumbbell caused by this result and the actual work damage convex tip matches and proposed to increase the size of the dumbbell nest rounded to reduce stress concentration and reduce stress peaks to resolve this issue. The study was designed scraper conveyor system connecting central groove provides a reference and theoretical basis

Identification of a highly conserved neutralizing epitope within the RBD region of diverse SARS-CoV-2 variants

Abstract The constant emergence of SARS-CoV-2 variants continues to impair the efficacy of existing neutralizing antibodies, especially XBB.1.5 and EG.5, which showed exceptional immune evasion properties. Here, we identify a highly conserved neutralizing epitope targeted by a broad-spectrum neutralizing antibody BA7535, which demonstrates high neutralization potency against not only previous variants, such as Alpha, Beta, Gamma, Delta and Omicron BA.1-BA.5, but also more recently emerged Omicron subvariants, including BF.7, CH.1.1, XBB.1, XBB.1.5, XBB.1.9.1, EG.5. Structural analysis of the Omicron Spike trimer with BA7535-Fab using cryo-EM indicates that BA7535 recognizes a highly conserved cryptic receptor-binding domain (RBD) epitope, avoiding most of the mutational hot spots in RBD. Furthermore, structural simulation based on the interaction of BA7535-Fab/RBD complexes dissects the broadly neutralizing effect of BA7535 against latest variants. Therapeutic and prophylactic treatment with BA7535 alone or in combination with BA7208 protected female mice from the circulating Omicron BA.5 and XBB.1 variant infection, suggesting the highly conserved neutralizing epitope serves as a potential target for developing highly potent therapeutic antibodies and vaccines