Automatic control system and method of knife feeding and retracting of dual-disc refiner

Abstract

The invention provides an automatic control system and method of knife feeding and retracting of a dual-disc refiner. The dual-disc refiner comprises a knife feeding speed reduction motor and a worm wheel and worm box. An output shaft of the knife feeding speed reduction motor is connected with a worm through a coupler. A coupler protecting cover is arranged on the periphery of the coupler. A counting marker is fixed to the coupler. A sensor corresponding to the counting marker in position is fixed to the coupler protecting cover. When the knife feeding speed reduction motor conducts rapid knife retracting, the sensor detects and records the rotating revolution N of the counting marker; when the knife feeding speed reduction motor conducts knife feeding, rapid feeding is conducted according to the revolution N stored in the last time of knife retracting, and the feeding revolution is (N-1); when knife feeding is conducted by (N-1) revolutions, rapid knife feeding is stopped and changedinto slow knife feeding; when main motor actual power collected by a power transmitter is equal to set power, knife feeding is stopped. The dual-disc refiner can conduct rapid knife feeding after being turned on, time is saved, energy consumption is reduced, the work efficiency of the device is improved, and the collision of abrasive discs of the dual-disc refiner can be prevented.

Description

Technical field [0001] The invention belongs to the technical field of equipment control of a double-disc refiner, and specifically relates to an automatic control system and method for the advance and retreat of a double-disc refiner. Background technique [0002] The double disc refiner is the most widely used refining equipment in the pulp line of the domestic paper industry. Because of the different final quality evaluations of various paper types, the disc refining degree is different. The size of the gap between the grinding discs directly affects the degree of beating of the disc grinding. To ensure that the disc grinding can produce suitable pulp under the appropriate grinding discs, a precise control system is required, as well as a reasonable control and detection structure. [0003] The working principle of the automatic control of the existing double-disc refiner is: set the power of the main motor of the double-disc refiner, measure the actual power of the main motor t...

AI Technical Summary

Problems solved by technology

[0004] The existing double-disc refiner starts to feed from the origin after starting up. When the feed starts from the origin, the frequency of the feed motor will gradually decrease with the increase of the power of the main motor, and there is a problem that the feed time is too long , resulting in an increase in power consumption and a waste of pulp, and there is a possibility of collision between the double-disc refiner, which affects the normal use of the double-disc refiner

[0005] Due to the change of the feed motor frequency, the torque of the feed motor is affected. When the slow feed is performed, the motor cannot drive the moving seat to move (grinding) under the condition of low frequency (below a certain frequency). If the slow feed distance is not suitable, In this working condition, it will inevitably affect the degree of beating

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