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Motion and kinetic analysis of Jaw Crusher

The motion mechanism consisting of eccentric shafts, moving jaws and ribs is the main working device of the Jaw Crusher. It is not only special in structure but also complicated in force. When the Jaw Crusher is operated under load, each moving part has a certain acceleration, which will generate a large inertia force, and the size and direction will change periodically. The inertial force of the moving part will cause additional dynamic load in the motion pair of the mechanism, which is the main cause of the vibration of the frame and the early wear of the parts. Therefore, the calculation and analysis of the load characteristics of the moving mechanism of the pe Jaw Crusher, and understanding the stress conditions and laws of each component are of great significance for improving and improving the working performance and service life of the crusher.

Taking the pe Jaw Crusher widely used at present as the research object, based on the simplification of its motion mechanism, the force analysis of the motion mechanism is carried out, and the kinetic energy model of the mechanism and the mathematical model of the kinetic energy characteristics of the mechanism are established. The force magnitude and variation law of each component in the motion of the mechanism provide the basis for the structural design and kinetic parameters optimization of the pe Jaw Crusher.

1, motion analysis

The working principle of the pe Jaw Crusher is that the eccentric shaft is rotated by the motor, and the moving cymbal suspended on the eccentric shaft periodically swings up and down with the rotation of the eccentric shaft. After the material enters the crushing cavity formed by the moving jaw and the fixed jaw, the angle between the rib plate and the moving jaw increases when the moving jaw is ascended, thereby pushing the moving jaw to close to the fixed jaw, and the cross-sectional width of the crushing chamber is reduced. The material in the crushing chamber is crushed or chopped to achieve the purpose of crushing; when the moving down, the angle between the rib and the moving raft is reduced, the moving raft is away from the fixed raft, and the broken material is from the lower end of the crushing chamber. discharge.

According to the principle of mechanism, the movement mechanism of the pe Jaw Crusher can be simplified into a flat four-bar mechanism. The eccentric shaft eccentricity, the center distance from the center of the movable bearing to the dynamic rib pad, the length of the rib, the distance from the center of the fixed bearing of the eccentric shaft to the fixed support point of the rib, respectively correspond to the crank, connecting rod and rocking of the four-bar mechanism Rod and rack.

2. Analysis of the kinetic energy of the organization

(1) Analysis of institutional stress

The force analysis of the moving mechanism of the Jaw Crusher under load conditions is a problem of the force of the known particle point motion law. The D’Alembert principle provides a general method for studying non-free-mass kinetics. From the kinetic theory to the “statics” problem, statics is used to solve the problem of kinetic energy. Using the D’Alembert principle, the inertial force and the moment of inertia are applied to the member as a virtual external force, and the Dalangb balance force system is established. The motion mechanism is balanced under the action of the external force and the inertial force system.

It is noted that there is no component gravity and material friction in the force analysis. This is because the crusher motion mechanism is a high-speed motion mechanism. Gravity, friction and the like are small compared with the inertial force and are generally neglected. In addition, the mass and moment of inertia of the rib relative to the main shaft and the moving jaw are also small, and the inertial force and the moment of inertia may be disregarded compared with other members.

(2) Calculation of the crushing force

The crushing force is the external load of the Jaw Crusher, and is the resultant force acting on the moving load on the movable jaw of the crushing cavity of the Jaw Crusher, which varies with the rotation angle of the main shaft. Studies have shown that when the material type is determined, the compression ratio of the material when compressed is the main factor determining the crushing force, and the crushing force per unit area is generally linear with the compression ratio.

It is envisaged that the crushing chamber is divided into a plurality of thin layers in the height direction, and the total crushing force is equal to the sum of the crushing forces of all the thin layers. The compression ratio of the material refers to the rate of change of the volume before and after the material is compressed, which is equal to the ratio of the volume being compressed to the original volume. Since the width of the crushing chamber is fixed, the change in volume before and after compression of each thin layer can be approximately equal to the change in its length.

(3) Calculation of inertial force

The inertial force is a reaction force that is resistant to the outside world due to the inertia of the object. The inertial force generated by the moving mechanism of the pe Jaw Crusher is mainly the inertial force and the moment of inertia of the main shaft and the moving jaw.

When the pe Jaw Crusher is working, the spindle is usually regarded as a constant-speed rotary motion under the action of the balance torque. Therefore, the angular velocity is constant, the angular acceleration is 0, and the centroid has only normal acceleration.

3. Analysis leads to conclusions

By optimizing the design, the influence of the additional dynamic load on the mechanical properties and life caused by the inertial force of the moving member is minimized, which is an important part of the design research of the crusher. Taking pe Jaw Crusher as the research object, based on the kinematics analysis of its moving mechanism, the dynamic static force analysis of the mechanism is based on the D’Alembert principle, and the pe Jaw Crusher moving mechanism under load conditions is established. The kinetic energy mathematical model solves the load characteristics of the pe Jaw Crusher under load conditions.

The results show that under the load condition of the pe Jaw Crusher, the force applied to the base mainly depends on the crushing force, and most of the load acts on the end support of the rib. The oscillating force and the oscillating torque generated on the base are cyclically changed with the spindle rotation angle. This result has important theoretical reference value for the structural design and kinetic parameters optimization of the pe Jaw Crusher.

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