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Frequency-variable control device for paper crusher and automatic speed-changing method

An automatic variable speed, paper shredder technology, applied in the direction of AC motor control, control system, electrical components, etc., can solve the problems of slow shredding speed, motor stop working, waste of electric energy, etc., to achieve improved utilization efficiency and great compatibility Effect

Inactive Publication Date: 2010-08-11
GUANGZHOU COMET
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The working principle of the paper shredder is relatively simple, but it brings corresponding problems: when shredding paper, regardless of the amount of paper at the paper inlet, the motor speed runs at a nearly constant high power for a long time, but actually shreds different paper quantities. The required power consumption is not the same. When the amount of paper to be shredded is greater than the load of the motor, the speed of shredding will slow down until the motor stops working; and when the amount of paper to be shredded is too small, the power consumption of the motor will be in vain. waste
[0004] In addition, for paper shredders in daily use, different types of machines generally have different powers, which means that they have different speeds. In practical applications, the motor cannot be fully utilized every time the paper is shredded. Therefore, this kind of paper shredder wastes electric energy to a large extent.

Method used

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  • Frequency-variable control device for paper crusher and automatic speed-changing method
  • Frequency-variable control device for paper crusher and automatic speed-changing method
  • Frequency-variable control device for paper crusher and automatic speed-changing method

Examples

Experimental program
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Effect test

no. 1 example

[0042] Adapt to the first embodiment of Fig. 1, its method is as follows:

[0043] Step 1: Start the paper feed detection unit 1 to detect the paper feed port, and send a start signal to the control unit 2 when it finds that there is paper feed, and the control unit 2 controls the motor with the lowest or highest initial The speed starts the motor to work, and the initial speed can be preset at the factory;

[0044]Step 2: Detect the speed of the motor through the speed feedback unit 6, and the control and frequency conversion unit (2 and 3) judge whether the speed of the motor is equal to or lower than a preset minimum value, which indicates whether the motor is normal The critical state of paper shredding, such as the speed is 0. If so, further reduce the operating frequency of the motor through control and variable frequency power supply under the premise that the operating frequency is higher than or equal to a certain preset minimum value such as 50 Hz, and the power dri...

no. 2 example

[0046] Adapt to the second embodiment of Fig. 2, its method is as follows:

[0047] Step 1: Start the paper feed detection unit 1 to detect the paper feed port, and send a start signal to the control unit 2 when paper feed is found, and the control unit 2 controls the motor to work in the no-load state through the frequency conversion unit 3 and the power drive unit 5;

[0048] Step 2: Detect the current of the motor through the current feedback unit 6', and identify whether the current is equal to or higher than a certain preset maximum value. Similarly, the maximum value represents the critical state of whether the motor can shred paper normally, If so, as shown in the method of the above-mentioned first embodiment, then further reduce the operating frequency of the motor on the premise that the operating frequency is higher than or equal to the preset minimum value, and repeat this step; otherwise, continue to shred paper normally;

[0049] Step 3: When the operating freque...

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Abstract

The present invention discloses a variable frequency speed-controlling device for cone breaker. It includes the following several portions: paper-feeding detection unit, it is used for detecting paper-feeding state and generating electric signal; control and frequency conversion unit, it is used for controlling operation of cone breaker, identifying state of the described electric signal and outputting forewards rotation or backwards rotation control signal, and making frequency conversion based on rotating speed / current of motor and outputting comprehensive control signal after the frequencyis converted; power drive unit, it is used for amplifying said comprehensive control signal, outputting said amplified comprehensive control signal to motor and controlling its rotating speed; and speed / current feedback unit, it is used for detecting rotating speed and current of motor and feeding them back into the described control and frequency conversion unit.

Description

【Technical field】 [0001] The invention relates to a frequency conversion speed control device of a paper shredder and an automatic speed change method thereof. 【Background technique】 [0002] The paper shredding mechanism used in the paper shredder usually includes a motor, a transmission gear, a cutter roller group and a corresponding control circuit. The motor is connected to an external power supply and connected to the cutter roller group through a transmission gear. broken. When in use, start the power supply first, so that the shredder mechanism enters the standby state. When the user feeds paper through the paper inlet of the shredder, the paper feed detection circuit built in the control circuit detects that there is paper feed, and sends a signal to the switch circuit. Turn on the motor, and the motor starts to shred paper. [0003] The working principle of the paper shredder is relatively simple, but it brings corresponding problems: when shredding paper, regardl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B02C25/00H02P27/06H02P27/04
Inventor 钟奋强
Owner GUANGZHOU COMET