Negative pressure batching machine chooses METTLER TOLEDO weighing module, weighing instrument is HBM, PLC is Siemens 300 series, and all analog signals are isolated by barrier. According to the formula set up in advance, the material is automatically discharged, and the actual discharging error is automatically corrected in the next discharging, after weighing, when unloading, according to the time set up for pre-mixing, to avoid the uneven effect of mixing in the mixing silo.
020-34563445Negative pressure batching machine is a kind of on-line measuring and dynamic metering system, which integrates the functions of conveying, measuring, batching and dosing, etc. It can improve the labor conditions, product quality and production efficiency. It mainly completes the crushing of raw materials, primary crushing by the crusher, partitioned and homogenized arrangement in the unloading yard, and then secondary crushing by the fine crusher into the silo. In this process, the crusher is strictly prohibited to start with load, and there should be an alarm signal when stopping; the unloading yard is divided into two unloading zones, and the unloading trucks should be freely switched in the two zones to make the fabric uniform.
The powder is weighed by the screw into the column mill for further grinding, and then separated by the powder selector for grade selection, and the qualified materials are conveyed to the raw powder bin through the corner screw conveyor, vertical bucket elevator, and top-of-bin screw conveyor. In this process, the spiral scale should be measured at a fixed value and required to calculate the cumulative output; the column mill also cannot be started with load, and the current needs to be detected; the material level signal is used to select the bin to be filled.
Weighing and Batching system adopts standard twisted-pair cable, field equipment status information and analog signals are transmitted to the controller in real time through the network of this layer; the second layer is the central monitoring layer, which realizes the communication between the controller and the operator station and the engineer station, the communication of the system adopts the TCP/IP protocol of Ethernet, and the transmission media is the coaxial cable, with the communication rate of 10MB/S, and the transmission distance can reach more than 1km, and the anti-jamming ability is strong. The transmission rate is 10MB/S. The transmission distance can be more than 1 kilometer, and the anti-interference ability is strong.
Each part of the production equipment needs to act in a certain order. Motor start and stop and valve opening and closing have a certain order and chain relationship. In order to ensure the normal operation of the process and the safety of the equipment, these relationships must be strictly followed. Weighing controllers provide this sequential start of the "automatic control" idea. In the central control room, the operator through the keyboard, can start and stop a group of equipment in sequence, without human intervention.
