Compound Cone Crusher

The compound cone crusher, also commonly referred to as the modernized improved version of the compound cone crusher or the Symons type cone crusher, belongs to the main models in the cone crusher family with a very large market share and high engineering recognition for medium and fine crushing. The applicable materials mainly consist of rocks and minerals with medium and high hardness, such as granite, basalt, diorite, river pebbles (high-silica pebbles), quartzite, iron ore, and non-ferrous metal ores, etc.

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The fundamental mechanism of the compound cone crusher is still eccentric-driven oscillatory crushing:
Power transmission: The motor drives the transmission shaft through a belt/ coupling, and then the pulley gear pair drives the eccentric sleeve to rotate.
Oscillatory motion: The eccentric sleeve forces the axis of the crushing cone (the moving cone) to make periodic oscillatory swings around the centerline of the main shaft - thus the crushing wall (the ram plate / the moving cone liner) on the surface of the moving cone will periodically approach and then move away from the fixed cone (the ram wall / the fixed liner of the adjusting sleeve inner wall).
Layered crushing process: The material falls from the central feed opening into the annular crushing chamber, and is distributed onto the cavity surface under the action of gravity and the fabric plate; as the moving cone oscillates, the material is repeatedly compressed, bent, and sheared in the annular gap between the crushing wall and the ram wall, and interlayer crush (layered crushing) occurs between the particles, gradually becoming smaller until the particle size is smaller than the opening size of the discharge port at the bottom, and is discharged from the bottom discharge port.
Overload/over iron protection (this is the practical meaning of the word "compound"): When inedible objects (iron blocks, shovel fragment, etc.) enter the crushing chamber, the force on the moving cone increases sharply → the system pressure abnormally rises → the spring group is compressed, and the moving cone / support assembly briefly sinks to allow the foreign object to pass through; or in conjunction with the hydraulic energy storage/release oil circuit to achieve controlled retreat; after the foreign object is discharged, it is restored to the working position under the action of spring reset (and hydraulic reset). More importantly: modern compound types usually have hydraulic lifting / clearing chamber cylinders, when the chamber is blocked, it no longer requires people to use welding guns and sledgehammers to struggle, but uses hydraulic force to lift the upper frame / main shaft assembly to a certain stroke to quickly clear the stuck material - this is the engineering intuition of "compound = spring + hydraulic assistance".

 

Frame and support system: The main frame is mostly an integral cast steel/welded reinforced structure. Load-bearing points with reinforcing ribs ensure rigidity under long-term impact loads.
Transmission system: Transmission shaft + tapered roller bearings for support + heavy-duty bevel gear pair transmission (small gear drives the large gear), with an outer belt pulley cover and coupling guard cover.
Offset sleeve and upper assembly of the main shaft: The offset sleeve is lined with a copper sleeve / bearing structure of babbitt alloy type (for some models, rolling bearings are used at key support points to reduce friction loss), this is the heart of the rotary swing motion.
Crushing chamber assembly: Fixed cone (chisel wall / adjustment sleeve) + movable cone (crushing wall) + locking method of the liner (threaded adjustment sleeve or hydraulic locking cylinder). The geometric shape of the chamber (entry width, parallel zone length, side wall angle) determines whether it is a coarse crushing, medium crushing or fine crushing orientation.
Spring safety group: Spiral springs / push rod spring groups arranged circumferentially around the frame, providing mechanical final overload release.

Gravel Aggregate Line: When using hard materials such as granite, basalt, or river pebbles, the common combination is: jaw crusher (coarse crushing) → compound cone crusher (medium crushing) → closed circuit screening (grinding/sizing). The strength of this line lies in the particle shape and grading stability of the finished products.
Metal Ore Processing Plant: For the medium and fine crushing section of "more crushing and less grinding", the feed size of high-pressure rollers or ball mills is reduced to lower the grinding energy consumption.
Limestone and medium-hard minerals: It can also be used, but if it is low abrasion and the aim is to achieve a lower single-machine cost, sometimes the impact crusher/hammer crusher route is more economical; the value of the compound type is more reflected in those lines with hard materials, abrasive materials, finished products needing to be cubic and stable production.

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