Pulverizer

Abstract

The present invention provides a pulverizer for pulverizing an object with a pulverizing blade, the pulverizer comprising: a drive motor for driving the forward and reverse rotation of the pulverizing blade; an inverter for controlling the rotational speed and rotational direction of the drive motor by changing frequency; and a control processor which is used for controlling the frequency converter. The control processor repeats the following overload relieving processing: in the process of enabling the driving motor to rotate forwards at the forward rotation frequency through the frequency converter, the control processor detects that the driving current value of the frequency converter is greater than a preset overload current value and continues for a preset time, and then the overload relieving processing is performed, the frequency converter stops the driving motor, after the driving motor stops for a preset time, the frequency converter enables the driving motor to rotate reversely for a certain time at a reverse rotation frequency and then stops the driving motor, and after the driving motor stops for a preset time, the frequency converter enables the driving motor to rotate forwards at a forward rotation frequency. By adopting the pulverizer, the pulverizing efficiency can be prevented from being influenced by repeated occurrence of a phenomenon that the object to be pulverized is clamped, and the service life of the driving motor can be prolonged.

Description

technical field [0001] The invention relates to a pulverizer, in particular to a pulverizer for pulverizing plastics. Background technique [0002] In the injection molding industry, a pulverizer for crushing scraps of injection molding products is often used, and the scraps of injection molding products after crushing are recycled as injection molding materials. The structure of this type of pulverizer, such as the structure of Patent Document 1, is equipped with two roller shafts, and the two roller shafts are provided with blades that are staggered and spaced apart from each other, so that the plastic is crushed and pulverized by the two roller shafts rotating in opposite directions. . [0003] However, because the shape and size of the leftovers of injection molding products are uneven, and sometimes the leftovers are criss-crossed, when using this type of pulverizer for crushing, the leftovers will be stuck between the blades, resulting in Shredder shutdown, etc. [...

AI Technical Summary

Problems solved by technology

[0007] 1. Although the locked crushing object can be released by reversing the roller shaft, and then continue to crush the crushing object by rotating the roller shaft forward again, the initial torque after the forward rotation again is still small, often It is not enough to cut or crush the hard or criss-crossed objects, and finally can only be cleaned up by the operator, which reduces the crushing efficiency

[0008] 2. During the repeated occurrence of the above stuck phenomenon, the load of the driving motor driving the crushing blade will be continuously overloaded, which will reduce the life of the driving motor or even burn out the driving motor

[0009] In addition, the existing pulverizer still has the problem of continuous idling when the pulverized object is occasionally cut off, resulting in energy waste

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