The weighing positive pressure Feeder consists of a storage conveyor, weighing module, weighing instrument, PLC control system, vacuum system, and weighing feeder. The combination of negative pressure conveying and batching tank, through the linkage between the weighing module on the reaction tank and the negative pressure conveying equipment, adopts a PLC full process control system, effectively solves many problems in the powder conveying process, and has the advantages of low energy consumption, low cost, and low maintenance. The weighing feeder runs Siemens WINCC monitoring software through a computer and communicates with two communication ports of the programmable controller through their respective communication ports. It can operate independently and play a role in mutual backup, greatly improving the reliability of the system. Monitoring software can dynamically display the process flow of the entire production process, display the operation, fault, and alarm status of each equipment, display process parameters such as temperature and pressure, and can set parameters such as alarm values, timing parameters, and weighing instrument parameters. Mainly responsible for ingredient measurement and feeding process control, the PLC sets and adjusts parameters such as weighing frequency, weight distribution, ratio, and impact difference on the CRT according to the pre-set requirements of the explosion-proof scale. At the same time, the actual value of each ingredient and the actual value of the undervalue are displayed on the CRT, as well as the next target value calculated by the PLC, the number of times weighed, the number of times to be weighed, the ratio, etc. The system also requires equipment control requirements such as ingredient interlocking, downward interlocking, and upward interlocking.

The weighing and Feeding machine adopts a hopper scale, and the lower half of the hopper scale is supported in a gradually shrinking conical cylinder shape in a bracket. A turning valve is installed inward at the top of the hopper scale, and inlet and outlet ports that can be connected to the silo are respectively provided at the outer ends of the turning valve. A pneumatic vibrator is installed on one side of the conical cylinder of the silo with a fixed seat. A weighing module is installed at each support point between the silo and the bracket, and the weighing module is electrically connected to the controller. A discharge valve is installed on the lower port of the conical cylinder of the silo. There are 3-4 Weighing modules between the silo and the bracket. When the weighing and batching machine is feeding, the turning valve cuts off the outlet channel and opens the inlet channel. The gas and material mixture being conveyed enters the silo through the inlet, and the material sinks into the silo under the action of gravity. The gas is discharged through the outlet channel of the silo, and when the weighing module reaches the weighing set standard, the output terminal of the weighing module sends an electrical signal to the controller. The controller controls the turning valve to cut off the outlet channel or open the inlet channel, close the channel leading to the silo, and the gas and material mixture flows directly from the inlet to the outlet to the back, achieving the purpose of online weighing.

Characteristics of positive pressure dilute phase pneumatic conveying system:

1. Using gas dynamic pressure, the material advances at a high speed in the conveying pipeline (8m/s-25m/s), and the conveying pressure gradually decreases along the conveying pipeline;

2. Continuous conveying, conveying flow state, conveying pressure and speed, and material to gas ratio remain basically stable, with high operational reliability and easy maintenance;

3. Can achieve multi-point simultaneous feeding and multi-point discharging;

4. When applied to closed-loop systems, there is no need to add gas buffering equipment, making it easy to control;

5. Short conveying distance, especially suitable for short or medium distance pneumatic conveying.

Basic Parameters:

Air velocity: 15m/s-30m/s,

Material speed: 8m/s to 15m/s,

Conveying capacity: 1-100t/h,

Conveying distance: up to 1000m (multi-stage power source can be used),

Gas source type: Roots blower or Roots air compressor.