When the crusher is working, there will also be a phenomenon in which the material block is turned up and down. Because, this is the particle size of the broken material can not be very uniform. When the block material is wedged between two small blocks. At this time, the angle of the material of the material is twice the friction angle between the materials, so the angle of the jaw crusher is between I8 and 22, for the medium-sized jaw crusher, 18 to 20, for small and medium-sized Take 20 to 22.
When the jaw of the jaw crusher leaves the fixed position, the broken material is discharged from the crushing chamber under the action of gravity. Obviously, as the number of reciprocating swings of the moving jaw increases, the productivity will increase accordingly. However, when the rotational speed exceeds a certain value, the swinging frequency of the moving jaw is too high, so that the broken material can not be completely discharged and the crushing chamber is easily blocked. Therefore, the jaw crusher has a critical transfer value. The theoretical critical speed value of the jaw crusher can be understood and calculated by the following assumptions. When the swing is oscillating, the effective action angle remains unchanged, that is, the movable 离开 moves away from the original position in parallel. After moving away from the fixed body, the broken material has a trapezoidal prism and is free to fall by gravity.
In fact, the broken material will encounter various resistances when it falls from the crushing chamber, which is not considered in the above formula and in the derivation process. Therefore, the time required to break the height of the material is actually longer. Therefore, when the speed of the jaw crusher is selected, the time for leaving the moving shaft is often extended, or the calculation speed is appropriately lowered. The reduction width is usually 5-10%, the productivity of the jaw crusher and the physical and mechanical properties of the crushed material (such as the compressive strength of the ore, the specific gravity, the feed size, etc., the structural properties of the crusher, the use conditions), etc. A variety of factors are relevant.
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