The Pressure relief metering mixing system is directly driven by the motor to rotate the main shaft through the weighing module, belt wheel and reducer box, and the rotating blade with special shape installed on the main shaft rotates accordingly. Under the action of centrifugal force and weighing force, the material rises along the conical wall of the fixed mixing tank and is in a state of rotational motion, forming a swirling movement. For materials with different densities, it is easy to mix evenly in a short time, and the mixing efficiency is more than twice that of the general mixer.
020-34563445The pressure relief metering mixing system is the core part of the batching production, and it has very high requirements for the accuracy, reliability and confidentiality of batching. By using the mass batching method, various powders are mixed here by weighing equipment in accordance with the input ratio provided by the operator. The accuracy of batching directly affects the stability of sintered ore content, thus putting forward higher requirements for the control system. It is mainly composed of PLC, feeding device, weighing device and frequency converter. The operator inputs the chemical composition and proportion of various raw materials through the operator station. The flow signal is converted into a 4-20mA signal by the weighing equipment and the weighing display, and then input into the functional module for comparison with the set value. The obtained control word is transmitted to the frequency converter through the Profibus-DP bus, and the frequency converter controls the rotational speed of the feeding device motor based on this signal. Make the feeding amount of each feeding device fluctuate slightly around the set value, thereby achieving the automatic batching function.
To ensure the air permeability of the ingredients, increase output and quality, it is necessary to add an appropriate amount of liquid in the first and second mixing processes. The amount of liquid added in one mixing is related to the original moisture content of the raw materials. Add liquid for the second time to make the liquid content of the mixture reach the target value set for the second addition, so as to improve the permeability. The volume of the first liquid addition is controlled by a rough percentage of the liquid addition volume, and the volume of the second liquid addition is controlled by PID, with the target liquid content set. Based on the current liquid content measured, it is compared with the target liquid content, and feedback correction is carried out with the given deviation to achieve automatic control of the liquid content.
The control system mainly accomplishes the detection and control of parameters related to the ingredients, as well as the manual and automatic control of parameters such as the pressure, temperature, gas pressure, gas flow rate, and combustion-supporting air pressure of the reaction vessel. It is monitored through the data display screen and the historical trend screen, and has the function of alarm history record.
