Eccentric block provided with movable counterweight block, vibrator and vibration screen

Abstract

The invention discloses an eccentric block provided with a movable counterweight block. The eccentric block provided with the movable counterweight block comprises an eccentric block chassis, a movable counterweight block and a spring, wherein a similar involute rail for limiting the moving range of the movable counterweight block and supplying supporting force is arranged on the eccentric block chassis; the movable counterweight block is arranged in the similar involute rail and can reciprocate at a position close to the center of a main shaft and a position far away for the center of the main shaft along a route of a similar volute; a spring fixing seat is arranged on the eccentric block chassis; one end of the spring is connected to the movable counterweight block, and the other end ofthe spring is connected to the spring fixing seat. The eccentric block provided with the movable counterweight block is applicable to a vibrator and a vibration screen, and is small in rigidity and compression strength of the supplied spring; the structure is compact; the resonant vibration range of the vibrating screen is reduced while the vibrating screen moves through a resonance area during being started and stopped, and the dynamic load over the ground is reduced; surrounding components cannot be impacted due to wide vibration range, and a screening machine body is prevented from adverseinfluence.

Description

technical field [0001] The invention relates to the technical field of vibrating screens, in particular to eccentric blocks of vibrating screens. Background technique [0002] In the prior art, the vibrating screen is composed of a motor, a screen body, a vibrator, a support assembly, a main shaft, an eccentric block, and a vibrating motor combining the motor and the vibrator. The motor drives the main shaft of the vibrator to rotate. The main shaft is equipped with an eccentric block. The main shaft drives the eccentric block to rotate. The centrifugal force and inertial force of the eccentric mass of the eccentric block drive the sieve machine to vibrate violently, and the materials are screened according to the particle size. According to its eccentric weight and eccentric moment, the eccentric block generates centrifugal force when it rotates at high speed, which can drive the screen machine weighing tens of tons to vibrate. The amplitude of the screen machine is related...

AI Technical Summary

Problems solved by technology

In the prior art, there is a way to reduce the resonance amplitude of the screen machine by using a vibration-reducing chassis or a damper, but the cost of the vibration-damping chassis is high, and the damper also has a bad influence on the screen machine

201520726899.5 provides a swinging eccentric block to change the static moment at different speeds, but the spring stiffness and the strength of the suspension column of the swinging eccentric block are high, and when the rated speed fluctuates within a certain range, the change of the centrifugal force will cause the swinging eccentric block to break. Swing, it is easy to cause frequent rotation and wear of the suspension column, and the swing eccentric blocks collide with each other or with the limit column; 201820033226.5 provides a structure of a dynamic eccentric block

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