In order to ensure the weighing speed and 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 automatic screw Feeding machine is composed of computer (PC), weighing instrument, PLC and system software. Using well-known high-performance and reliable industrial control machine, PLC, weighing instrumentation and other high-quality components, in terms of operation, the computer and the control cabinet to realize the two manual/automatic free switching operation and control, in the production state with the operation of the instructions, fault alarm function, automatic data backup and real-time display of a variety of production reports to browse and print the function of the system has a single weighing a single mixed, dual weighing a single mixed, double weighing a single mixed, double mixing a double mixing, triple mixing a double mixing, more than one weighing a single mixed, etc. Multi-mixing and so on. The standard version controls 16 bins, and can be designed and manufactured according to different requirements of users. The system has good expandability, flexibility, open intelligent network system.
Weighing screw Feeder by adding a small amount of material to the mainstream material modification, or a variety of materials in a certain proportion of preparation and mixing into a new substance, is the key process of powder material production, and more and more widely used. Such as power plant flue gas to add calcium hydroxide, activated carbon desulfurization, wheat flour plus trace elements nutritional enhancement, water treatment to add powder, extruder, mixer quantitatively add a variety of materials, premix preparation, flux flux dosage production and so on. To accurately add a variety of trace substances to the mainstream materials, you need to choose the right micro screw feeder to achieve the desired goal.
Screw feeder is mainly composed of mechanical part and control part. According to the measurement mode is divided into two categories, volumetric measurement and gravity measurement. Gravity automatic screw feeding machine is based on the volumetric screw feeding machine to increase the weighing module, weighing instrument and become.
The control section is divided into two types: volumetric metering control and gravimetric metering control.
(1) Volumetric metering control
By changing the rotational speed of the feeding screw, to adjust the feeding flow, commonly used: frequency converter + gear motor, stepping motor + stepping.
Drive + stepper weight indicator, electromagnetically regulated motor + electromagnetically regulated weight indicator to realize it.
(2) Gravity metering control
Through the change of material weight in the machine, to adjust the feeding flow. It is realized by adding weighing module and weighing instrument on the basis of volumetric metering.
The mechanical part is mainly composed of transmission, shaft seal, feeding screw, turning mechanism and hopper.
(1) The transmission is composed of asynchronous motors, inverter motors, stepping motors, electromagnetic speed-regulating motors, capacitor speed-regulating motors, etc., which can be selected according to the requirements.
(2) Shaft seal has skeleton oil seal, copper sleeve seal, mechanical seal and other forms, should be designed and selected according to the material properties. For very fine particle size of micropowder, such as shaft seal selection is not appropriate, it is easy to enter the reducer and make gear wear, or even failure. For pneumatic conveying screw feeder shaft sealing requirements are higher. Conveying pressure is too high, but also need to use back pressure to prevent air leakage.
(3)There are full-face type, spring type, paddle type and screw belt type, which have their own scope of use. Different traits of materials need to be based on experience or experiments to determine the appropriate type of screw.
(4) The turning mechanism has cross type, spiral type and so on.
