Grain suction press is a machine that can realize fast and flexible conveying of bulk grains. The conveying distance can be 3-30m, and the processing capacity can reach 7-12t per hour. It combines two pneumatic conveying modes and is capable of handling a variety of material handling tasks. Ensure the continuity of material flow. With its pipeline conveying characteristics, the grain suction press keeps the grain relatively closed during the transfer process, reducing the contact between the material and the outside world. It is an indispensable practical tool in the current grain transfer link.
Grain suction press can suck grains from a variety of complex environments. Whether it is scattered grains, grains spread on the ground, or hard-to-reach corners such as trucks, train carriages, and the bottom of the cabin, the suction nozzle can penetrate into them for suction. This flexibility greatly facilitates grain loading and unloading and transfer in different scenarios. In addition, it can adapt to a variety of grain types, including wheat, corn, rice, soybeans, etc. Combining the two modes of suction (negative pressure) and pressure (positive pressure), the grain suction press has a strong conveying capacity. It can not only transport grains horizontally for hundreds of meters, but also lift them to a height of tens of meters, meeting the needs of transporting grains to tall silos, the top of grain storages or long-distance barges. This reduces the dependence on other mechanical equipment (such as conveyor belts and elevators) and simplifies the transportation process.
The working principle of the grain suction press combines the two pneumatic conveying methods of negative pressure suction and positive pressure conveying. The grain is first sucked into the system by negative pressure, and then the grain is delivered to the designated location over a long distance by positive pressure. This combination gives the suction press a flexible suction capacity and a strong conveying capacity, showing significant advantages in the process of grain loading, unloading, transshipment and storage.
Suction and conveying stage (negative pressure conveying): In this stage, the suction press uses a fan to generate negative pressure (vacuum). Its core components include a vacuum pump/fan, which generates a low-pressure area, i.e. negative pressure; a suction nozzle, usually an adjustable nozzle or a nozzle with auxiliary airflow, is inserted into the grain pile. A suction pipe connects the suction nozzle and the separator (or cyclone separator). Separator/cyclone separator, when the air flow containing grains enters, due to the reduction of air flow speed and the effect of centrifugal force, the grains settle in the separator and are separated from the air. The air is sucked into the fan through the filter.
Workflow: When the fan is working, negative pressure is formed in the suction pipe. Under the action of negative pressure, the air around the suction nozzle and the grains are sucked into the pipe together to form a gas-solid mixed flow. Driven by the air flow, the grains are transported to the separator along the pipe. In the separator, the grains are separated from the air, and the grains fall into the buffer bin below or directly into the inlet of the pressure conveying stage, while the clean air is discharged by the fan. This stage is characterized by flexibility and strong adaptability to materials, and can absorb grains from various locations such as loose piles and the bottom of the carriage.
Pressure conveying stage (positive pressure conveying): When the grains are separated from the air in the separator and enter the next link, the suction compressor switches to the positive pressure conveying mode, or the separated grains are sent to the positive pressure conveying pipeline through a rotary feeder (air lock). At this time, the fan generates positive pressure (high pressure). Rotary feeder/air lock, which is the key component connecting the negative pressure area (below the separator) and the positive pressure area (pressure delivery pipeline). It can quantitatively and continuously feed grain into the positive pressure pipeline while preventing the positive pressure gas from flowing back into the negative pressure system. The pressure delivery pipeline connects the rotary feeder and the discharge point. The discharge point is usually a bin, silo, truck or ship cabin, where the grain is discharged by gravity or further air flow diffusion.
One of the core uses of grain suction presses is to quickly and easily load and unload grain. Whether it is sucking bulk grain from a temporary stacking point in the field into a transport vehicle (such as a truck, train car), or unloading grain from a transport vehicle into a silo, warehouse, barge or ship cabin, it can easily complete it. Its flexible suction nozzle can reach deep into the corners of various containers to ensure the transfer of materials.
In the process of grain storage and processing, the transfer and emptying of grain are common needs. Grain suction presses can transfer grain from one silo to another, or transport it between different warehouses. This helps to achieve classified storage, inventory adjustment, or ventilation and dust removal when necessary to ensure the quality of grain during storage.
After grain is harvested or stored, some grain is often scattered on the ground or piled in irregular areas. Grain suction presses can be used as a cleaning tool to suck up these scattered grains and re-pile them to designated locations to reduce material waste. For example, scattered grains on the warehouse floor, dock yard or beside the train track can be effectively collected by suction presses.
Although the suction press itself does not have a drying function, it can be used to transport grain to the corresponding equipment entrance before the grain enters the drying equipment or is ventilated. Through pneumatic conveying, the grain is in contact with the air in the pipeline, which also has a certain auxiliary effect on the heat dissipation of the grain and the preliminary removal of surface moisture, creating favorable conditions for subsequent drying or ventilation processes.
Grain suction presses have shown many inherent advantages in practical applications. The equipment can adapt to a variety of operating environments, whether it is a temporary stacking point beside a farmland or a loading and unloading area at a warehouse or dock, it can be flexibly deployed and put into operation. Its characteristic of material transmission through pipelines allows the grain to move smoothly during the transfer process, while limiting the contact of the material with the external environment. In addition, the grain suction press has a long conveying distance and high adaptability, and can deliver grain to storage facilities at different levels.
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