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.

依據(jù)顆粒在輸送管道中的密集度，氣力輸送可以分為分為以下三種：

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

抽風(fēng)機開啟后，整個氣力輸送系統(tǒng)呈一定的真空度，在壓差作用下，空氣流使物料進入吸嘴，并沿輸料管送卸料處的分離器內(nèi)，物料從空氣中分離出來之后，再由分離器底卸出，氣流經(jīng)除塵器凈化后再經(jīng)消聲器排入大氣。吸送式的優(yōu)點是供料簡單，可以同時從多處吸取物料，但是輸送距離較正壓短，生產(chǎn)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、壓送式

2、 Pressure feed type

鼓風(fēng)機將空氣壓入輸送管內(nèi)，物料從供料器送入，空氣與物料的混合物沿著輸料管被壓送到卸料處，物料經(jīng)過分離器后被卸出，空氣經(jīng)除塵器凈化后排入大氣。壓送式的特點與吸送式相反，可以將物料同時輸送到多處，輸送距離長，生產(chǎn)率高，對沿途設(shè)備及管道密封要求高。

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

顧名思義，混合式是將上述兩種形式進行組合。與機械式連續(xù)輸送裝置相比，混合式氣力輸送物料是在完全封閉的情況下輸送，幾乎不受氣候與環(huán)境的影響，能夠保證物料不受潮、不污損、不摻雜，能夠現(xiàn)場工人的工作條件，改善廠區(qū)環(huán)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.

混合式氣力輸送系統(tǒng)設(shè)備簡單，結(jié)構(gòu)緊湊、現(xiàn)場占地較小，布置靈活，設(shè)備費用較低，可同時進行某些工藝（如粉碎、烘干、分級等），易于企業(yè)集中控制，能夠?qū)崿F(xiàn)企業(yè)物料輸送自動化提升運輸實力。

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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