Variation rules of speed and accelerated speed of points on the movable jaw have a great impact on the crushing performance of the compound pendulum jaw crusher, especially when the three kinematical characteristics, including displacement, speed, and accelerated speed of the movable jaw are combined together.
Under normal circumstances, particle materials crushing on the upper part of the movable jaw requires certain displacement to meet the needed amount of compression needed for material crushing. In addition, the relationship of speed to accelerated speed must be appropriate. When the movable jaw plate moves towards the fixed jaw plate for material crushing, it will accelerate its movement if the direction of the speed accords with that of the accelerated speed. Thus, the force exerted on the materials will increase rapidly, leading to the impacting of the movable jaw and materials. It is known to all that the materials with certain hardness will bounce off each other when colliding. Whereas, since the movable jaw is connected with the machine, only the materials will bounce off. Chances are that materials will bounce back and forth in the crushing cavity if cannot be crushed or worse, pop out from the feeding port. If operators are nearby, significant casualties and property losses may be caused. This is the so-called ‘material popping’ phenomenon.
In order to avoid the occurrence of this phenomenon, it is best to ensure the opposite directions of the speed and the accelerated speed when the materials come in contact with the points on the upper part of the movable jaw for crushing in the design or improvement of jaw crusher. Therefore, the points will move towards the materials in deceleration. The increase of the force exerted on the materials will not be overquick. Hence, the materials will be crushed by relatively slow squeezing rather than crashing. There is a time when direction of the speed and that of the accelerated speed are opposite in the course of the movable jaw movement towards the fixed one. If the materials crushing occurs during that period by contacting with the movable jaw, it can be very beneficial. The kinematical characteristics of the underpart of the movable jaw differ from those of the upper one because the underpart demands the same direction of the speed and the accelerated speed.
According to the foregoing analysis, the relationship between the speed and accelerated speed of the movable jaw has a significant impact on the kinematical characteristics. To achieve proper relationship between the speed and the accelerated speed over the course of movable jaw movement: firstly, the ability to draw and analyze the chart of the speed and accelerated speed of the movable jaw plate is requested, which is also the reason why we analyze the relationship herein; secondly, jaw crusher capable of parameters adjustment needs to be designed. Consequently, the proper relationship of the speed and the accelerated speed can be realized.
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