Weighing Pneumatic conveyors can be controlled in various ways, including automatic operation, manual operation and central control operation. Take automatic operation as an example. When the control system issues a conveying signal, the exhaust valve and feed valve of the pneumatic conveying device open, and loading begins. When the set weight is reached, the exhaust valve and feed valve automatically close. After a delay of 5 to 8 seconds, the fluidization valve and the conveying valve open, and the conveying process begins. When the conveying pressure inside the pump is lower than the set pressure, the control system sends a signal, the exhaust valve and the fluidization valve close, and the conveying is completed.

The Hopper weighing feeding machine is composed of a Roots blower, a gate valve, a rotary feeding device, a Venturi jet device, conveying pipelines, pipeline branch valves, a hopper scale, a dust removal device on the top of the silo, an electrical control system and related auxiliary Settings. The weighing module is used for measurement and installed on the hopper machine to weigh the discharging device and the hopper machine. The difference between the total amount of material in the hopper machine and the weight of the material in the reduced weighing tank is calculated. Based on the weight loss per unit time, the actual feeding rate is compared with the set feeding rate, thereby controlling the discharging device to ensure that the actual feeding rate always accurately conforms to the set value.

The Spiral weighing feeding machine compares the actual feeding amount with the preset standard amount at any time. The deviation amount is randomly adjusted by the industrial control computer to the rotational speed of the precision screw conveyor, making the total amount approach zero, and at the same time calculates and displays the corresponding cumulative amount. While the pre-feeding bin is feeding materials to the hopper scale through the feeding valve, the control system automatically switches to the volumetric feeding mode and feeding state (in the design, the volumetric feeding time is shortened as much as possible to improve the feeding accuracy). When the hopper scale has completed feeding, the pneumatic feeding valve automatically closes to stop feeding, and the system automatically enters the metering feeding state again. This cycle repeats.

The Conveying weighing feeding machine mainly consists of a hopper scale and a batching and weighing screw. According to the pre-set feeding amount, the batching and weighing instrument and PLC start the batching and weighing screw to add powder or granules to their respective hopper scales at a certain feeding speed. After the weighing is completed, the materials are distributed on the aggregate screw and then put into the mixer for mixing.

The weighing reduction machine measures the change in weight obtained per unit time by using the weighing module. The change in weight is based on the actual feeding rate of the screw conveyor. The weighing hopper and the screw mechanism are regarded as the entire scale body. The weight signal of the scale body is continuously sampled by the weighing instrument or the upper computer, and the change rate of weight per unit time is calculated as the instantaneous flow rate. Then, through various software and hardware filtering techniques, the "actual flow" that can be used as the control object is obtained.

The weighing reduction machine controls the speed of the discharge screw conveyor based on the rate of weight reduction of the material in the weighing hopper to achieve the purpose of quantitative feeding. When the material in the weighing hopper reaches the lower limit of weighing, the discharge screw conveyor fixes the discharge volume according to the current speed and simultaneously controls the material in the silo to quickly drop into the weighing hopper. When the material is loaded to the upper limit of the scale, the loading stops. Rapid loading can shorten the feeding time, improve the accuracy of weighing and control precision. Through the fixed-value control of material quantities at each stage, automatic batching control and the collection and transmission of a series of signals are achieved during the production process, thus realizing precise control of feeding.

The weighing screw conveyor is designed based on the principle of gravity weighing and is an automatic metering device integrating mechanics and electronics. The material sent out by the concealed flow system is conveyed to the feeding port of the screw conveyor scale body by the feeder. When the material is conveyed at a constant speed through the screw conveyor scale body, the speed signal of the screw shaft is transmitted to the weighing instrument by the speed detector installed at the shaft end (or the speed signal is obtained from the motor reducer). At the same time, the gravity of the material acts on the weighing bridge frame. The gravity signal generated by the ear shaft support point on the bridge frame and the weighing module is also input into the secondary instrument. The weighing instrument amplifies the signal, and the cumulative weight and flow rate obtained through A/D conversion operation are displayed on the weighing instrument panel. The material after measurement is sent to the next level of equipment from the discharge port of the scale body.

The structure of the Jacket weighing and mixing equipment consists of a high level bin, a valve, a vibrating motor, a weighing module and a reactor, as well as a set of position detection devices. During the charging waiting phase, the mobile drum is parked on the electronic scale and at the position of the reactor charging port waiting for control commands. According to the charging parameters entered by the operator, the silo valve opens to discharge the material. The amount of feed is continuously collected through the electronic scale, and the valve is closed when it reaches the dosing set value of one advance, which can be calculated by the time of the valve or obtained by experience. When the added material reaches the specified weight, the valve is automatically closed.

The pre-set dosing plan of the Condensation weighing and mixing equipment automatically weighs various materials, automatically controls each link of dosing, and completes the dosing process. According to the amount of feeding, the speed of the motor is controlled. When the feeding value is close to the set value, the low-speed feeding mode is adopted. Due to the retention of materials in the air between the feeding port and the feeding tray, the motor stops rotating when the control lead is reached. When the actual batching process reaches the control lead amount, due to the difference in material density, the quality of the air material retained after the motor stops rotating is different, and the lead amount of the motor stop is set according to the actual operating condition.