Vibration exciter and vibration sieve

Abstract

The invention discloses a vibration exciter and a vibration sieve of the vibration exciter. The vibration exciter comprises a vibration shaft (1) and an eccentric block (2). Under a non-working state of the vibration exciter, a barycenter center line (AA) of the eccentric block (2) is deviated from a center line (BB) of the vibration shaft (1). In addition, the eccentric block (2) is arranged to move in the direction vertical to the center line (BB) of the vibration shaft (1) opposite to the vibration shaft (1). The vibration exciter further comprises a buffering device used for buffering the eccentric block (2) to move opposite to the vibration shaft (1). When the vibration exciter is started, centrifugal force is used for making the eccentric block gradually move in the direction which enables the eccentric distance to be increased to a working position through buffering of the buffering device. Thus, in the starting process, pull-in torque of the vibration exciter gradually increases from low torque to the working torque, namely the vibration exciter is started with the low torque. When the vibration shaft is driven by a motor, impact on a power grid is little, and in addition, the power factor of the motor is set to be at the optimal position and the efficiency is improved.

Description

technical field [0001] The invention relates to a road construction machine, in particular to a vibrating screen exciter and a vibrating screen including the vibrating screen. Background technique [0002] The vibration exciter is an important part of the vibrating mechanical work. The mechanical exciter provides power for the vibrating mechanical work through the exciting force generated by the rotation of the eccentric block. [0003] figure 1 and figure 2 Shown is a commonly used vibrator in the prior art. It includes a vibrating shaft 1 and a fixed eccentric block S, wherein the fixed eccentric block S is fixed on the vibrating shaft 1 by bolts, and the vibrating shaft is driven by a motor (or hydraulic motor, etc.) to drive the fixed eccentric block to rotate to generate eccentric force. In the prior art, since the fixed eccentric block and the vibrating shaft are fixed, the starting torque is relatively large. When the vibrating shaft is driven by a motor, the impa...

AI Technical Summary

Problems solved by technology

In the prior art, since the fixed eccentric block and the vibrating shaft are fixed, the starting torque is relatively large. When the vibrating shaft is driven by a motor, the impact on the power grid is relatively large, and the capacity of the power transformer is required to be relatively high; at the same time, when the vibrating machine works stably The driving power is much smaller than the driving power at startup. In order to start the vibrating machine, a high-power driving motor must be selected, resulting in high motor cost and low power factor when the driving motor is running.

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