A Abutment — In coal mining, 1 the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch of strata spanning the roadway; and 2 the weight of the rocks over a longwall face is transferred to the front abutment, that is, the solid coal ahead of the face and the back abutment, that is, the settled packs behind the face. Acid deposition or acid rain — Refers loosely to a mixture of wet and dry "deposition" deposited material from the atmosphere containing higher than "normal" amount of nitric and sulfuric acids.
Roll crushing surfaces operate at a fixed distance apart, as opposed to the continually changing distances in a jaw or cone crusher.
Product size is much more consistent. Both oversized pieces and fined are minimized. Wet, sticky materials are more easily handled. The rolls act as flywheels, contributing to smooth operation and efficient use of power. Roll crushers are low in profile and relatively easy to install.
They can be fed with a minimum of headroom, or even choke fed. Internal parts are readily accessible. Typical feed materials for Williams Roll Crushers include: Single Roll Crushers, sometimes called lump breakers, can also be used for breaking frozen or agglomerated materials.
Double Single or Double Roll Crushers? The choice depends upon the type of feed material, feed size, product size desired, and consistency of both feed and product.
Both single and double roll crushers operate most efficiently with dry, friable materials. However, single roll machines have been widely and successfully used for the reduction of moist clays.
They also have been long used as primary and secondary coal crushers, both at mine sites and power plants, where a minimum of fines is desired. Single Roll Crushers reduce via a combination of impact, shear, and compression. The rolls are always toothed in patterns suited to the feed material.
Single Roll Crushers generally handle larger feed sizes at higher reduction ratios in higher capacities and are particularly well suited to be used as lump breakers.
Double Roll Crushers reduce primarily through compression, although some shear is obtained with toothed rolls. Rolls for these crushers come in combinations of smooth, corrugated, and toothed designs.
Double Roll Crushers produce a finer product at lower reduction ratios and capacities. Jackshafts for control of roller speed are standard on double roll crushers, optional on larger Single Roll Crushers. Protective Spring Releases Heavy-duty compression springs permit movement of floating roll to pass tramp metal and other uncrushables, avoiding overload and damage.
Smaller Single Roll Crushers are equipped with a shear pin release. Allows shock loads to be taken in compression rather than tension. Choice of Drives Multiple V-belt drives recommended for maximum shock absorption.
Shaft-mounted speed reducers optional. Easy Accessibility Housings for single crushers split and open at centerline for access to all working parts. Double Roll Crushers models dismantle easily.
Low Peripheral Speed Combined with compression-type reduction, results in less maintenance when crushing abrasive materials.
Welded Steel Frame Heavy rolled plate and welded structural shapes for rigidity and resistance to shock.
Reversible, Replaceable Liners Protect internal surfaces and frame. Thick, abrasion-resistant alloy are reversible for added life and easily replaced. Custom-Engineered Replaceable Roll Faces Faces Tooth patterns and corrugations to fit feed material; abrasion-resistant alloy; easily replaceable.Laboratory Double Roll Crusher consists of roll wheel, roll bearing, pressing device, adjusting device and driving device etc.
Discharging size adjustment: between two roller equipped with cuneate or gasket adjusting device, top of the wedge device capped with adjustment bolts. Scent-free storage for your gear at home, at the lodge or on the way to the hunt.
Scent Crusher's Ozone Gear Bag protects clothes and gear for an extended period of time or for a quick touch up between hunts. Roller Crusher. Roller crusher is widely used for fine or superfine crushing in the industries of mining, construction materials, metallurgy, chemical industries and so on.
It can crush all kinds of materials under middle hardness, such as ore, rock, coke, coal, clinker, ceramic raw materials, slag, refractory materials, chemical materials and so on.
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