Method for detecting paper shredder blocking and rotation and paper shredder having blocking and rotation detector

Abstract

This invention relates to a method for testing block of a kneader, which sets a bar magnet along the shaft diameter direction, sets a Hall element at a suitable place separating from the bar magnet to be connected with the control circuit of the kneader, when the motor rotates, the Hall element is induced with the magnetic field to output variety level, when the motor is blocked, it outputs high or low levels and the control circuit of the kneader controls it according to the level output by the Hall element, in which, a related device is installed in the core shell to form a kneader unit with a blocking test device and separate the blocking test device and the control circuit relatively, which is benefit to strengthening the usage of the control circuit.

Description

【Technical field】 [0001] The invention relates to a paper shredder blocking detection method and a paper shredding mechanism with a blocking detection device. 【Background technique】 [0002] Motor stall detection usually adopts the current detection method, including current mutual inductance detection and indirect voltage detection. These two detection methods are to determine the detection circuit parameters according to the specific parameters of the motor. To correspond to a detection circuit, specific to the application of paper shredders, due to the wide variety of paper shredders, if this circuit is used for detection, the control circuit cannot be universal, which brings certain drawbacks to the design and cost. More importantly: On the one hand, the working current of the motor is also related to the tightness of the machine tool and the wear of the gear. Due to the inconsistency of the tool assembly, it is easy to detect the motor stall and stop when the amount of ...

AI Technical Summary

Problems solved by technology

[0002] Motor stall detection usually adopts the current detection method, including current mutual inductance detection and indirect voltage detection. These two detection methods are based on the specific parameters of the motor to determine the detection circuit parameters. To correspond to a detection circuit, specific to the application of paper shredders, because there are many types of paper shredders, if this circuit is used for detection, the control circuit cannot be used universally, which will bring certain disadvantages to the design and cost.

More importantly: on the one hand, the working current of the motor is also related to the tightness of the movement tool and the wear of the gear. Due to the inconsistency of the tool assembly, it is easy to mistakenly detect that the motor is blocked and stop when the amount of shredded paper does not reach the maximum. On the other hand, as we all know, temperature is also an important reason that affects the internal resistance of metals. As the temperature rises, the resistance of the copper wire of the motor coil increases, and the locked-rotor current of the motor will become smaller. When the motor is locked, the detection circuit will also falsely detect it as a normal state

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