The pneumatic conveying system can be designed according to the properties (particle size, specific gravity, etc.) of the conveying materials provided by the customer, conveying distance, climbing height, site conditions, production capacity, conveying mode (intermittent or continuous), and select appropriate equipment. Its working principle is to use the kinetic energy of the air flow to make the granular materials in a suspended state, bolt or sand dune shape. With the air flow conveying along the pipeline, the device for conveying the granular materials by the air flow according to the pressure supply mode, There are three types: suction type, pressure type and mixed type.

依据颗粒在输送管道中的密集度，气力输送可以分为分为以下三种：

According to the density of particles in the conveying pipeline, pneumatic conveying can be divided into the following three types:

一、吸送式

1、 Suction type

抽风机开启后，整个气力输送系统呈一定的真空度，在压差作用下，空气流使物料进入吸嘴，并沿输料管送卸料处的分离器内，物料从空气中分离出来之后，再由分离器底卸出，气流经除尘器净化后再经消声器排入大气。吸送式的优点是供料简单，可以同时从多处吸取物料，但是输送距离较正压短，生产率不高。

After the exhaust fan is turned on, the whole pneumatic conveying system presents a certain degree of vacuum. Under the action of pressure difference, the air flow makes the materials enter the suction nozzle and send them to the separator at the unloading place along the conveying pipe. After the materials are separated from the air, they are discharged from the bottom of the separator. The air flow is purified by the dust collector and then discharged into the atmosphere through the muffler. The advantage of the suction type is that the feeding is simple, and materials can be sucked from multiple places at the same time, but the conveying distance is shorter than the positive pressure, and the productivity is not high.

二、压送式

2、 Pressure feed type

鼓风机将空气压入输送管内，物料从供料器送入，空气与物料的混合物沿着输料管被压送到卸料处，物料经过分离器后被卸出，空气经除尘器净化后排入大气。压送式的特点与吸送式相反，可以将物料同时输送到多处，输送距离长，生产率高，对沿途设备及管道密封要求高。

The air blower presses the air into the conveying pipe, and the materials are sent from the feeder. The mixture of air and materials is sent to the unloading place along the conveying pipe. The materials are discharged after passing through the separator, and the air is purified by the dust collector and discharged into the atmosphere. The characteristics of the pressure feeding type are opposite to those of the suction feeding type. It can transport materials to multiple places at the same time, with long conveying distance, high productivity and high requirements for equipment and pipeline sealing along the way.

三、混合式

3、 Hybrid

顾名思义，混合式是将上述两种形式进行组合。与机械式连续输送装置相比，混合式气力输送物料是在完全封闭的情况下输送，几乎不受气候与环境的影响，能够保证物料不受潮、不污损、不掺杂，能够现场工人的工作条件，改善厂区环境。

As the name suggests, hybrid is a combination of the above two forms. Compared with the mechanical continuous conveying device, the mixed pneumatic conveying material is transported under the condition of complete closure, which is hardly affected by the climate and environment. It can ensure that the material is not affected by moisture, dirt and doping, and can improve the working conditions of on-site workers and improve the plant environment.

混合式气力输送系统设备简单，结构紧凑、现场占地较小，布置灵活，设备费用较低，可同时进行某些工艺（如粉碎、烘干、分级等），易于企业集中控制，能够实现企业物料输送自动化提升运输实力。

The hybrid pneumatic conveying system has the advantages of simple equipment, compact structure, small site occupation, flexible layout and low equipment cost. It can carry out some processes (such as crushing, drying, grading, etc.) at the same time. It is easy for enterprises to control centrally, and can realize the automation of enterprise material conveying and improve the transportation strength.

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