The Principle of crushing without rubbing.
The production capacity of Access PetrotecJaw Crushers is considerably higher than that of conventional crushers. The secret lies in the principle of crushing without rubbing.In the conventional type double toggle crusher, the stone is pushed upwards, as shown in Fig. 1 The stone rubs against the jaws, consequently the wear is fast, the capacity is low and power is wasted. The same is the case with conventional single toggle crusher, but with further disadvantage of high bearing pressures due to the stone being pushed up and down as shown in Fig. 2.
The design of Access Petrotec Jaw Crusher ensures crushing by pressure only, Fig. 3, below illustrates how the motion of the jaw plates is squarely against the rock. The hinge pin H is located well above and almost on the line AB passing through the centre of the crushing zone. Every portion of the swing jaw S follows the parts of arcs shown by arrows C and D, passing squarely through the crushing zone. The stone is gripped firmly and is crushed with minimum rubbing action. It means less wear, less power consumption and more production.
Manufactured from steel plates and heavily ribbed in welded steel construction, to withstand heavy crushing and impact loads.
Manganese steel jaw plates last longer than any other, due to crushing without rubbing. Different types of jaw plates are available to suit particular crushing applications.
Automatic continuous splash lubrication, by positive gear pump for the bearing pitman and toggle mechanism, enables the crusher to run safely at relatively higher speeds.
In case of accidental overloads, the safety device disengages the driven pulley instantaneously which then runs only as a loose pulley. The machine is thereby protected against damage.
Shaft and Bearings
The high strength eccentric shaft of special steel is carried in self-aligned spherical roller bearings of ample capacity, which ensures smooth running.
Always in compression. It is very light in weight and has maximum load bearing capacity due to its unique design.
The crusher operates with a single lightweight flywheel, which also transmits power to the main shaft through the safety device. The crusher can be easily started with a normal duty squirrel cage motor.
Double toggles for even the smallest size crusher give better distribution of load. Well-designed compression springs provide cushioning to the toggle mechanism, eliminate knocks and reduce the resultant wear.
Sturdy hinge pin of Carbon steel is located in correct relation to the crushing zone for crushing without rubbing.
A specially designed oil resistant flexible diaphragm seals the opening in the oil chamber and protects the toggle mechanism against dust.
The crusher requires minimum power as no power is wasted for the lifting of a heavy unbalanced jaw and other oscillating parts. Horsepower required is based on use of electric motors in normal condition. Petrol or diesel engine should be of approximately 15 to 25% higher capacity than electric motors with the rating adjustedfor losses due to altitude.
Capacity & Power Chart
Based on Bulk Density 100 lb/cu ftor 1600 kg/m3.
Blast Furnace Slag
Ores of Copper
Lead and Zinc
Ferro Alloys (Both Low Carbon & High Carbon Variety) such as Ferro Silicon
- 1. Capacity figures indicated in the chart are approximate and are based on bulk density of 100 lb/cu ft or 1600 kg/m3 with following assumptions.
Continuous regulated feed • Maximum lump size does not exceed 80% of the size of mouth opening • With standard jaw plates actual capacities will depend on the crushing characteristics of the material.
Capacities indicated are for medium hard materials. While crushing harder materials, capacity figures are likely to change, consult Sayaji in that case.
2. For achieving cubical product from the crusher, usage of serrated jaw plates is recommended. While using serrated jaw plates capacity figures will be reduced.
3. All models have independent oil tank, oil pump with motor, flow switch and all accessories for continuous lubrication.
4. Independent oil lubrication system as above can be provided for these models at extra cost.
5. The table indicates standard models only. Special sizes of Jaw Crusher can be offered against specific requirement on demand.
6. In specific cases double flywheel design is adopted.