What is the method of removing iron effect of electromagnetic iron remover?

An iron remover is a device that produces a strong magnetic attraction. Its purpose is to remove iron and other magnetic materials mixed in raw materials to ensure that crushers, ball mills and other mechanical equipment in the delivery system can work properly. The iron removal efficiency of iron remover in China is generally not high. In order to improve the efficiency of iron removal, some factories usually use 2 or 3 stage iron removal methods, but still can not meet the requirements of plant selection. The main reason is that the iron material at the bottom of the coal has a small electromagnetic force, and it is also subject to the pressure of coal, so the iron removal effect is not good.

In recent years, a method has been developed to improve the efficiency of iron removal, the implementation of a short-term incentive on the electromagnet, that is, the installation of sensors in front of the electromagnetic ferromagnetic shoe and below the conveyor belt, the purpose is to use the sensor to detect the magnetic substance far away from the magnetic shoe, the attraction effect is weak, and then pass the detected signal to the excitation rectifier through the sensor, so that the magnetic substance again passes under the pole shoe. A high power supply voltage is applied to the magnet ring for a short time, resulting in a strong magnetic flow, so that the electromagnetic suction increases sharply in a short period of time, thereby sucking out the magnetic material buried deep, and then the voltage returns to the normal power supply state. The purpose of the sensor mounted on the front of the boot is to avoid electromagnetic field interference. In general, the sensor does not send a signal when the iron is in the upper or middle of the coal seam. The signal can only be sent when the iron is buried at the bottom of the coal seam.

The inductor has the following links: The normal excitation trigger control link is mainly for the normal excitation control of the electromagnet, which needs to have the trigger pulse movement adjustment function, and control the main thyristor KP1 and KP2 in the same way to achieve the normal excitation current regulation. The strong excitation delay control link is to provide a delay from the detection of iron material signal, to the iron material just runs to the electromagnet pole shoe before the delay, and then start the strong excitation control signal, start the strong excitation trigger link, and perform strong excitation at a good time, and minimize the strong excitation time, do not miss the purpose of capturing strong excitation.

The strong excitation time control link is mainly to control the length of the reinforcement time, the strong excitation time is controlled in the front section of the running front pole shoe, and the back end of the running rear pole shoe can control the strong excitation time in a good range. Under the control of strong excitation delay and strong excitation time, the strong excitation trigger pulse is sent to the thyristor KP3 and KP4 of the main circuit for strong excitation. In addition, it is not necessary to carry on the shift control of the trigger pulse, and only need to control the trigger Angle to a small value, so that a larger strong current can be obtained.