A method for automatic control of the liquid level of a small flotation machine

Abstract

The invention discloses a liquid level automatic control system and method for a small-sized flotation machine. The liquid level automatic control system for the liquid level automatic control system comprises a PLC (Programmable Logic Controller) module and a touch screen connected with the PLC module, the input end of the PLC module is connected with a liquid level meter for detecting a pulp liquid level in a floatation cell of the flotation machine in real time, the output end of the PLC module is connected with a motor forward and reverse rotation control circuit for controlling the motor forward and reverse rotation which drives an ore-drawing gate valve to act, and a motor is connected with the motor forward and reverse rotation control circuit. The liquid level automatic control method for the small-sized flotation machine comprises step 1, setting parameters; step 2, detecting and transmitting liquid level signals in real time, and step 3, analyzing and processing the liquid level signals and controlling the motor through the PLC module. The liquid level automatic control system and method for the small-sized flotation machine greatly improves the stability of the liquid level of the small-sized flotation machine, prolongs the service life of the motor, a relay and the gate valve, improves the reliability and the stability of the working of the small-sized flotation machine, reduces use costs and guarantees the smooth progress of normal production.

Description

technical field [0001] The invention belongs to the technical field of liquid level control of a flotation machine, and in particular relates to an automatic liquid level control method of a small flotation machine. Background technique [0002] Domestic and foreign flotation machine liquid level automatic control systems are mostly used in large-scale flotation machines, most of which adopt PID control or fuzzy control, which can achieve a good control effect. However, due to the small flotation machine (capacity of 16m 3 The flotation machine below) has a relatively small volume, and the designed foam layer is thin. The liquid level of the flotation machine is greatly affected by the fluctuation of the ore pulp, and it is difficult to realize the automatic control of the flotation liquid level. It consumes manpower and material resources, and the adjustment is slow, which affects the flotation effect. [0003] In order to solve the problems of manual control, someone int...

AI Technical Summary

Problems solved by technology

However, due to the small flotation machine (capacity of 16m 3 The flotation machine below) has a relatively small volume, and the designed foam layer is thin. The liquid level of the flotation machine is greatly affected by the fluctuation of the ore pulp, and it is difficult to realize the automatic control of the flotation liquid level. It consumes manpower and material resources, and the adjustment is slow, which affects the flotation effect

[0003] In order to solve the problems of manual control, someone introduced the PID control method suitable for large flotation machines into small flotation machines. The specific control process is as follows: in order to maintain the stability of the liquid level in the tank, the system uses The position feedback is compared with the set liquid level value to obtain the opening of the ore discharge ram, and the PLC module judges and adjusts the opening of the ore discharge ram through the position sensor to change the discharge of tailings to balance the liquid level of the flotation machine; after production The application found that the PID control method cannot keep the liquid level of the small flotation machine in a relatively stable state, the liquid level fluctuates greatly, and the process is unstable; moreover, the failure rate of the position sensor is high, which is a vulnerable part, which affects the stability of the entire system and reliability, requiring frequent maintenance and repairs

After analysis, it is found that the reason for the unstable control is that the volume of the small flotation cell is relatively small, the fluctuation range of the liquid level is large, the PID control method is real-time, and it will frequently send execution signals to the ram, and the ram moves continuously. The adjustment of the liquid level of the selected machine has a delay, which makes the system unable to stabilize the liquid level, but makes the liquid level fluctuate more

At the same time, the frequent action of each actuator (motor, relay, gate) will greatly reduce the service life of each actuator, and directly affect the reliability of the entire system

When the control system sends out an execution signal for a short period of time (such as 0.1 second), it may cause the system to have too much instantaneous current, burn the electronic components, cause system failure, and affect normal production.

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