And the final product sizes can be adjusted to meet various requirements of the customers. To crush marble, jaw crusher features high crushing ratio and large capacity. Besides, we adopt high quality material to make the movable& fixed jaw plate in order to extend the service life of the crusher. The capacity can reach to 800 tons per hour.Zenith provides three different types of jaw crusher, PE, PEW and HJ series jaw crusher.
Only about 25 days stocking and communicating with each other departments in our company, our sent the machine to Vietnam, and our excellent after-sales team install the machine for the customers . We also do freely training for them about how to use the machine and do maintenance for the machine correct in the regular time.Above is the information about one costumer, who came from Vietnam, and visited our company two years ago, and he bought one PEW250*1200 jaw crusher from our company under the suggestion by our professional engineer.
And it is widely used for secondary or fine crushing and its looks very similar to the short head crusher who features short spindle, small size final product, and high crushing efficiency.Before long, steep inclined compression cone crusher also appeared, started this crusher is called compression gyratory crusher. in fact, this crusher is improved on the base of gyratory crusher.
The brackets fill and 31 are shorter than the brackets 2-3 and 2?, and the roller 34 is located in horizontal position under the central part of the belt 36. The rollers 33 and 35 slope upward and outward and support the outer portions of the belt as in such manner as to form the belt into a continuous trough.
Infrastructure construction, driven by the Australian mining boom, is coming to an end. With the expected recovery in demand for quarry products from the resurgence in residential building activity being delayed by a stubbornly high Australian dollar, quarry owners, operators and contract crushing companies are being forced to deal with a lull in demand that is challenging their profitability.
•Tributary load is too conservative for longwall mining. Itassumes that all other stress components of the mining stress field have noeffect on the pillar performance.4. So, any irregularity (i. solidribs) will be relatively far away from the majority of the pillars, so its overallinfluence on the entire pillar structure can be neglected.e.Stresses in pillar by Tributary area MethodPillar StressγH (w p + we )2γHσp ==w 2p1− Rwhere H = depth of cover, γ = unit weight of overburden ; Can beexpressed in terms of extraction ratio R = total void/ total areaw2R =1−p(wp+ we )2Tributary area pillarSafety factorstressduring developmentActual pillarstressStrength of pillarShSF == pStress on pillarσpwpPILLAR LOADINGTributary area loading concept It has certain following limitations: •The attention of tributary load is being restricted to the normal pre-miningstress to apply to the vertical principle axis of the pillar support system. It overestimates thepillar loads, because tributary load assumes the load is uniformly distributedover the pillars, which is not the case.4. •Tributary estimates are valid only if the geometry of pillars is highly regularand it is repeat itself over a relative distance. Forexample, it cannot estimate the abutment load on a chin pillar. •Tributary is only applicable for support pillars under static load.
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