According to the vibration trajectory of the vibration mechanical vibration body, it can be divided into a vibration machine of a reciprocating motion trajectory, a vibration machine of a gyroscopic motion trajectory, and a vibration machine of a complex motion trajectory According to the vibration vibration mode, it can be divided into crank linkage vibration machinery, electromagnetic vibration machinery and inertial vibration machinery.
      The crank link vibration mechanism is excited by the crank link mechanism, one end of the crank is hinged to the prime mover, and the other end is hinged to the link. The connecting rod has two kinds of rigid connecting rods and elastic connecting rods. When the rigid connecting rod is used, the other end of the connecting rod is hinged with the vibrating body; when the elastic connecting rod is used, the other end of the connecting rod passes through the end of the transmission spring and the vibrating body connection. The prime mover drives the crank to rotate, thereby driving the vibrating body through the connecting rod to reciprocate. The inertial force of the vibrating body is transmitted to the foundation through the crank-link mechanism. In order to reduce the power transmitted to the foundation, it is usually necessary to add a-bias to balance the motion.
     The length of the crank determines the amplitude of the vibrating body, and the rotational speed of the crank determines the operating frequency of the vibrating body.
 This type of vibration machine has the following characteristics:
(1) Large working noise and short life
(2) The inertial force of the vibrating body cannot be automatically balanced
(3) The excitation mechanism has no added mass to the vibrating body. Mainly used in low frequency, large amplitude process.