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Which Material Characteristics Will Affect The Application of The Vacuum Feeder

The vacuum feeder is a device that uses air with a certain speed and pressure to drive granular materials to be transported in a vertical or horizontal direction in a closed pipeline. The conveying process of the material is completely controlled by the power state of the air. When the air speed is in the critical range, the material is in a suspended state. In other words, the gravity of the material is balanced with the power of the air; below the critical range, the material drops: above the critical range, the material is transported.

Since the application range of the vacuum feeder has a very close relationship with the physical properties of the conveyed materials, the following analyzes the influence of several main material characteristics on the application range of the vacuum conveyor.
(1) The particle size of the material. If the particle size of the material is too large, it is easy to block in the feeding device, so that the material cannot automatically enter the feeding pipe. Therefore, it is generally required that the particle size is not greater than 20mm, or the larger particle size of the specified material should not exceed 0.3 to 0.4 times the diameter of the conveying pipe.
(2)The bulk density of materials. The bulk density of materials largely affects the size of the pneumatic conveyor and the size of energy consumption. Because with the increase of the density of the material, the air velocity in the pipe must be increased, so that the power consumption increases and the pipe wall wears faster. Therefore, it is not appropriate to use pneumatic conveying for materials with high bulk density.
(3)The humidity of the material. The humidity of the material has a great relationship with the reliability of the pneumatic conveyor. Excessive humidity will not only destroy the loose nature of the material, but also adhere to the inner wall of the device components, resulting in uneven feeding, increased energy consumption, reduced conveying capacity, and even blockage of the entire system. Therefore, for various materials, the limit humidity at which the transportation is not damaged must be determined.
(4)The abrasiveness of the material. The so-called abrasiveness refers to the abrasiveness of moving materials to other objects. The size of the friction depends on the hardness, surface characteristics and shape size of the object particles, which affects the power consumption and service life of the pneumatic conveyor.
(5)The temperature of the material. The combustible dust of the conveyed material will produce a dust explosion at a certain concentration and temperature, causing serious accidents. Therefore, during pneumatic conveying, the temperature of the material must not exceed its ignition point (generally lower than 400℃, otherwise it should be conveyed by inert gas.

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