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Dynamic analysis of hammer crusher



2020-11-06 12:57:54 1092

When the hammer crusher is working, the motor drives the rotor to rotate at high speed, and the material enters the crusher cavity evenly. The high-speed rotating hammer head impacts and tears the material to cause the material to be broken. It can be seen that the actuator of the hammer crusher It is a hammer head, and the hammer head and the hammer body are rigidly connected by threads. In order to carry out the dynamic analysis of the hammer crusher, the hammer head and the hammer shaft bearing key are studied as a whole (this whole is called the hammer shaft). br/>

The establishment of dynamic model

The dynamic model of hammer crusher. The hammer shaft is composed of bearing shaft key hammer body and hammer head. From a dynamic point of view, it can be simplified to a single-disk double-hinge support system with one degree of freedom. The system has only one degree of freedom to rotate around a horizontal axis. With the angle of rotation as a parameter, its geometric position can be determined. The loads acting on the hammer shaft of the hammer crusher mainly include friction load, inertial load, damping load and working load load.

Hammer crusher structure diagram

Analysis of impact load characteristics

There is a great impact force in the process of the hammer shaft crushing materials, and the impact force acts on the hammer head of the hammer shaft to generate a load moment. The impact force is In the form of rectangular pulse, the load torque is also in the form of rectangular pulse. Assuming that the rotation speed of the hammer shaft of the hammer crusher is n, the frequency of the impact force or the load torque is fk2n60 or the period T60 (2n). Because the impact time is extremely short, The action time of impact force or load moment is also very short, which can be considered as a pure pulse form of load.

Working principle of hammer crusher

Establish dynamic equations

The hammer shaft can be simplified to a single-degree-of-freedom double-hinged disk. Since the damping in the system is negligible compared with the load moment, the time domain analysis method is adopted. The power torque of the power part composed of the motor and the reducer is not calculated. When the hammer crusher is analyzed in the system, the power torque only needs to be superimposed on the response of the system.

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