In order to ensure the weighing speed and Material discharge weighing accuracy, the automatic feeding system adopts real-time weighing, and all the feeding machines realize two levels of feeding speed, fast and slow. Weighing is done in a fast way, and when the weighing value is close to the set value, it is done in a slow way until the set value is reached and the feeding is stopped. This weighing system adopts a micro-range weighing device to provide a weighing device for small amount of bulk materials, which integrates feeding, weighing and discharging automatically. The weighing part of the device is separated from the other parts during weighing, and the weigher is emptied after each weighing, which not only improves the weighing accuracy, but also saves cost and improves the time efficiency.
020-34563445The Material discharge automatic feeding system for discharging materials is composed of a computer, weighing instrument, PLC and system software. It adopts well-known high-performance and reliable industrial control computers, PLCS, weighing instruments and other high-quality components. In terms of operation, the computer and control cabinet can freely switch between manual and automatic operation control in two locations. In the production state, it has the functions of operation indication, fault alarm, automatic data backup, real-time display of various production reports, browsing and printing. The system includes single-scale single-mix, double-scale single-mix, double-scale double-mix, triple-scale double-mix, multi-scale multi-mix, etc. The standard version controls 16 positions and can also be designed and produced according to different user requirements. The system features excellent scalability, flexibility and an open intelligent network system.
The weighing screw Feeder modifies the mainstream materials by adding a small amount of substances or mixes multiple materials in a certain proportion to form new substances. It is a key process in the production of powder materials and is being applied more and more widely. For instance, in power plant flue gas, calcium hydroxide and activated carbon are added for desulfurization; in wheat flour, trace elements are added for nutritional enhancement; in water treatment, medicinal powder is added; in extruders and mixers, various materials are quantitatively added; premixes are prepared; and in the production of flux and fluxes, etc. To accurately add various trace substances to the mainstream materials, it is necessary to select the appropriate trace screw feeder to achieve the expected goal.
The screw feeder is mainly composed of the mechanical part and the control part. According to the measurement method, it can be divided into two major categories: volumetric measurement and gravity measurement. The gravity-type automatic screw feeder is developed by adding Weighing modules and weighing instruments to the volumetric screw feeder.
The control section is divided into two types: volumetric metering control and gravity metering control.
Volumetric metering control
The feeding flow rate can be adjusted by changing the rotational speed of the feeding screw. Commonly used methods include: frequency converter + reduction motor, stepper motor + stepper.
It is achieved through a driver + stepping weighing display, and an electromagnetic speed-regulating motor + electromagnetic speed-regulating weighing display.
(2) Gravity-based metering control
The feeding flow rate is adjusted by the change in the weight of the materials inside the machine. It is achieved by adding weighing modules and weighing instruments on the basis of volumetric measurement.
The mechanical part mainly consists of transmission, shaft seal, feeding screw, flipping mechanism and hopper.
(1) The transmission is composed of asynchronous motors, variable frequency motors, stepper motors, electromagnetic speed-regulating motors, capacitor speed-regulating motors, etc., and can be selected according to requirements.
(2) Shaft seals come in various forms such as skeleton oil seals, copper sleeve seals, and mechanical seals. They should be designed and selected based on the properties of the materials. For very fine micro-powder, if the shaft seal is not properly selected, it is very easy for it to enter the reducer, causing gear wear and even failure. The shaft seal requirements for pneumatic conveying screw feeders are higher. For those with excessively high conveying pressure, back pressure should also be adopted to prevent air leakage.
(3) Feeding screws can be classified into face type, spring type, paddle type and helical ribbon type, each with its own application scope. The suitable screw type for materials with different properties should be determined based on experience or experiments.
(4) The material turning mechanisms include cross frame type, screw type, etc.
