Vibration exciter and vibrating screen

Abstract

The invention discloses a vibration exciter and a vibrating screen with the vibration exciter. The vibration exciter comprises a vibrating shaft (13), a fixed eccentric block (10) fixed to the vibrating shaft (13) and a movable eccentric block (1) rotatably arranged on the vibrating shaft (13). The vibration exciter comprises a screw transmission pair, a first piston (17) and a driving unit used for driving the first piston (17), the screw transmission pair is fixedly connected with the movable eccentric block (1), the driving unit is arranged to drive the first piston (17) in the starting process of the vibrating shaft (13), and therefore the movable eccentric block (1) is driven by the screw transmission pair to rotate relative to the vibrating shaft (13). The vibration exciter can achieve low-torque starting, is small in impact on a power grid and small in required power transformer capacity, a high-power driving motor is not needed, the motor power factor can be at a best position, and 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 13 and a fixed eccentric block 10, wherein the fixed eccentric block 10 is fixed on the vibrating shaft 13 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 ...

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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