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Laboratory Cone Crusher

US$10,000

The 911MPE-TM-LCC21 Laboratory Cone Crusher grinds 19 mm feed to -10 mesh and grinding fineness can be precisely calibrated by easily rotating the adjusting ring. Custom cones are available in materials to suit specific applications. The Laboratory Cone Crusher is typically used in applications where there are space limitations or flat (plate-like) rocks are being crushed.canada manufacturer

It weighs 273 kilos and comes with a 3 phase 60 cycle 3 HP motor as standard. A 1 phase and / or 50 cycle motor is available which must be specified at time of ordering. It has rugged, fabricated cast steel construction with reinforced joints and internal welds and joints ground and polished. The funnel can be easily removed by simply rotating and lifting up.

  • Crusher, with cone and mantel of alloy-1, fully hardened to Rockwell 60, 208/220/440/575 volt, 3 phase, 60 cycles, 5 HP motor1-year-warranty
  • Crusher, with cone and mantel of alloy-2, fully hardened to Rockwell 60, 208/220/440/575 volt, 3 phase, 60 cycles, 5 HP motor
  • Crusher, with cone and mantel of mild steel, case hardened to 1/8″ depth Rockwell 60, 208/220/440/575 volt, 3 phase, 60 cycles, 5 HP motor

Laboratory Cone Crusher Specifications

  • Grinds 3/4″ feed to -10 mesh
  • Grinding finenesses can be precisely calibrated by easily rotating the adjusting ring
  • Custom cones are available materials to suit specific applications
  • Rugged fabricated / cast steel construction with reinforced joints and internal welds and joints ground and polished
  • One or two drawers are available (stainless steel also available)
  • Optional Dust extraction port
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Description

laboratory_cone_crusher

OPTIONAL LABORATORY CONE CRUSHER EQUIPMENT:

  • Electrical Pre-wiring box with On/Off switch and overload protection for motor
  • Funnel for safe continuous feeding or batch feeding
  • A Drawers (all the way through) or 2 (one on each side)
  • Stand
  • Pressure cleaning equipment

laboratory_cone_crusher_design

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laboratory cone crusher (1)

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Laboratory Cone Crusher

laboratory cone crusher

Cone Crusher Fundamentals

laboratory cone crusher working principal

As with the gyratory, crushing results from interaction between three essential parts. The important difference is that in this case the spindle (1) is not hung from its upper end but is supported in a universal bearing below the gyrating head or “cone” (2). Normals to the arc through the universal bearing carrying the breaking head intersect at O. This breaking head gyrates inside an inverted truncated cone (3), called the bowl, which flares outward and thus allows for the “swell” of the broken ore by providing an increasing space for it to enter after each “nip” has released crushed ore for a further drop.

Industrially, two types are made, the standard and the short-head. These differ chiefly in the shape of the crushing cavities. Standard crushers deliver a crushed product varying from ¼” up to 2½” usually in open circuit and can be fitted with fine, medium, coarse, or extra-coarse crushing cavities. Short-head cone crusher has a steeper head angle, a longer parallel section between cone and bowl, and a narrower feed opening. They deliver a crushed product ranging from 1/8″ up to ¾”, and usually work in closed circuit.

The clearance between cone and bowl helps the ore to spread as it works its way down. Choked crushing is avoided since the rock gravitates into an increasing cross-sectional area. The “throw” of the gyrating cone is greater than would be practicable in primary crushers, which must withstand heavier working stresses. Higher speeds are also used (from 435 RPM up to 700 RPM), and particles appear to flow through the machine, partly because of their freedom of movement and partly because, at each revolution, the gyrating head drops from under the recently nipped material. Unlike that for primary crushers, the set is the minimum discharge opening, since during its last two or three nips, the particle of ore must pass through a parallel-sided crushing zone. Tramp oversize can escape, when un-crushed oversize particles succeed in forcing the bowl up, or if clayey feed accumulates on the crushing faces. In the former event the bowl, normally held down to its job by nests of springs, yields sufficiently to allow the object to pass through.

The springs then return the bowl to its correct clearance. While this happens or when choked with clay, the Symons cone crusher is apt to let oversize escape. Such clay is sometimes dealt with by introducing water with the feed. Better practice is to remove it by washing. It is dangerous with any dry-crushing machine to risk the entry of abrasives into its bearings or bevel gears.

The springs then return the bowl to its correct clearance. While this happens or when choked with clay, the Symons cone crusher is apt to let oversize escape. Such clay is sometimes dealt with by introducing water with the feed. Better practice is to remove it by washing. It is dangerous with any dry-crushing machine to risk the entry of abrasives into its bearings or bevel gears.

The springs which hold down the bowl yield when the load is too severe. It is therefore usual to run the cone crusher in closed circuit with a screen, thus ensuring that “tramp oversize” is returned for further treatment. This recirculated material, which may include fragments of non-magnetic steel not removed by the guard magnet, may call for removal by special methods.

laboratory short head cone crusherstandard laboratory cone crusher

With some ores there is a tendency for extra tough particles to “spring” the crusher at a slight oversize to the set. This leads to accumulation in the closed circuit of such particles, and if neglected can build up sufficient pressure in the crushing throat to present a problem not met with in the types of crusher. In passing, it should be noted that in all closed circuits there is selective retention of one fraction of the ore stream which may call for special measures. A simple solution is to use a screen slightly over-sized to the set of the cone crusher, and thus increase the severity of the crushing action upon the most prominent (largest) particles.

Ratio of reduction is controlled by screwing the bowl up or down by means of its capstan and chain. It is usually held between 3:1 and 7:1, though higher ratios can be worked with some ores.

A 2′ standard cone crusher receiving —2¾” rock is rated to deliver 15 tons/hour —¼” in open circuit, or 60 tons/hour when reducing —4″ feed to 1½”. A 2-ft. short-head crusher receiving 1 3/8″ feed and delivering 1/8″ in closed circuit has a capacity of 6 tons/hour. When reducing —2″ feed to —½” product the capacity is 20 tons/hour. The coarser 7-ft. standard crusher has a capacity of 900 tons/hour when reducing —18″ rock to 1½”. Such general figures, taken from manufacturer’s literature, would require checking for performance on samples of the specific ore if it was proposed to work a crushing plant at full capacity.

In the Hydrocone crusher the cone is held up to the correct setting by a hydraulic jack instead of by springs. An automatic method of reset allows the cone to yield when an uncrushable object enters, and to return to the correct setting after this has passed through.

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