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Powerful mixer control method and system

A powerful mixer and control method technology, applied in the direction of control/adjustment system, mechanical oscillation control, non-electric variable control, etc., can solve the problems of shortening the service life of key equipment and affecting the normal use of powerful mixers, and avoid resonance phenomenon , the effect of protecting from damage

Active Publication Date: 2017-07-11
ZHONGYE-CHANGTIAN INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] If the working speed of the agitator of the intensive mixer is near the resonance point, it will seriously affect the normal use of the intensive mixer and shorten the service life of key equipment such as the bearing of the agitator of the intensive mixer.

Method used

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  • Powerful mixer control method and system

Examples

Experimental program
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Effect test

Embodiment 1

[0058] First introduce the working principle that the present invention is based on, see figure 2 , which is a graph showing the relationship between the mixing effect of the intensive mixer provided by the present invention and the rotational speed of the stirring paddle.

[0059] Among them, the abscissa R is the rotation speed of the stirring paddle, and the ordinate G is the mixing effect.

[0060] It can be understood that the stirring paddle is driven to rotate by the paddle motor. The rotational speed of the stirring paddle motor is controlled by the stirring paddle inverter. When the output frequency of the stirring paddle inverter is different, the corresponding rotating speed of the stirring paddle motor is different. When the output frequency of the stirring paddle inverter is higher, the corresponding speed of the stirring paddle motor is higher, that is, the speed of the stirring paddle is also higher.

[0061] From figure 2 It can be seen that the mixing effec...

Embodiment 2

[0089] see Figure 5 , which is a flow chart of Embodiment 2 of the control method provided by the present invention.

[0090] Detecting the amplitude of the intensive mixer within the working frequency range of the agitator frequency converter, specifically including S501 and S502;

[0091] S501: Control the operating frequency of the agitating paddle frequency converter to increase successively with predetermined frequency steps within the operating frequency range;

[0092] For example, f=N i , N i+1 =N i +N, where N i It is the output frequency of the frequency converter of the stirring paddle that needs to detect the amplitude of the intensive mixer. N is the predetermined frequency step size, N i The value range of is the working frequency range ((N min ,N max ) within the frequency.

[0093] It should be noted that the value of N can be set according to actual needs, for example, it can be set to 1, that is, the value of N is incremented with 1 Hz as the predet...

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Abstract

The embodiment of the invention discloses a powerful mixer control method and system. A powerful mixer comprises a stirring paddle motor and a stirring paddle frequency converter. The stirring paddle motor drives a stirring paddle to rotate under the control of the stirring paddle frequency converter. The method comprises the following steps: detecting the amplitude of the powerful mixer within the operating frequency range of the stirring paddle frequency converter; determining whether resonance occurs according to the amplitude of the powerful mixer; when it is determined that resonance occurs to the powerful mixer, obtaining the operating frequency of the stirring paddle frequency converter corresponding to the resonance as resonant frequency; and controlling the stirring paddle frequency converter in the powerful mixer to avoid the resonant frequency. The method detects the amplitude of the powerful mixer when the stirring paddle frequency converter operates in the whole operating frequency range, finds out the operating frequency of the stirring paddle frequency converter corresponding to the resonance of the powerful mixer as the operating frequency, and controls the stirring paddle frequency converter not to operate in the resonant frequency so as to avoid the resonance of the powerful mixer and to protect the powerful mixer against damage.

Description

technical field [0001] The invention relates to the technical field of intensive mixers, in particular to a method and system for controlling an intensive mixer. Background technique [0002] Intensive mixer is an important equipment in the pelletizing process of iron and steel enterprises. Its function is to mix the binder used as bentonite and iron concentrate evenly to prepare for the next process. In the pellet production process, the mixing effect has a great influence on the quality and cost of the pellets. Advanced mixing equipment is used. For pellet plants with good mixing effect, add about 0.5% of bentonite; for pellets with poor mixing effect plant, add about 2% bentonite. Taking a pellet plant with an annual output of 1.2 million tons as an example, if advanced mixing equipment is used and the mixing effect is good, it will cost 120*(2%-0.5%)=18,000 tons less a year. [0003] The most advanced mixing equipment for pellets is a vertical intensive mixer. A typica...

Claims

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Application Information

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IPC IPC(8): G05D19/02
CPCG05D19/02
Inventor 刘雁飞刘克俭
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD
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