Apron feeders is one of the feeding equipment in material crushing system, divided into heavy duty, medium duty and light duty, and now the common one is heavy duty.
Heavy apron feeders is suitable for short distance conveying materials with large capacity and particle size, also can be used as a buffer bin to feed the primary crusher, can continuously and evenly feed the next process, can withstand large bin pressure, it is characterized by large feeding capacity, low speed and high torque.
Generally, the chain selection of heavy apron feeders is relatively easy, but for large heavy type (length more than 20m) However, the chain selection of large heavy apron feeders (length more than 20m) has a great influence on the working performance and equipment cost of the whole machine.
It is necessary to make a detailed calculation of the chain tension, adjust and reduce the chain tension through analysis and calculation, and choose a suitable chain.
For this reason In this artical, we analyze the composition of chain pulling force and calculate the effect of different feed thickness on chain pulling force by taking a large heavy plate feeder in a mobile crushing plant as an example. The effect of different feed thickness on chain pull force is calculated.
Reducing the chain tension is crucial to the design cost of the whole machine and the design, selection and matching of parts. It is directly related to the selection of chain, motor, reducer, hydraulic system and other external parts.It also has a direct impact on the design strength and rigidity of the whole machine. The most direct and effective way to reduce the chain tension is to control the chain tension.

The most direct and effective way to reduce the chain tension is to control the feed thickness of the heavy apron feeders, and the following example shows the relationship between the thickness of the material layer and the circumferential force of the drive wheel.
Design a 2 400X28000 heavy apron feeders, known: production capacity Q = 4500t / h, material
density = 2.1t/ m, installation inclination 6 = 25 00 (74.7 + 485) -1765 kg/ mqRO = 600 kg/ mqR = 100 kg /
ma0=0.5in mouth=0.8 mt=0.317 inR=0.514 m
From the above calculation, when the thickness of the material layer is reduced from 1.8 in to 1.6 m, i.e., when the thickness of the material layer is reduced by 11%, .
The chain speed increases 14%, the circumferential driving force decreases 15%, the chain tension decreases 13.5%, and the power decreases 5%. When the material layer thickness decreases from 18 m to 1.4 m, i.e. layer thickness decreases by 22%, chain speed increases by 28%, circumferential driving force decreases by 30%, and chain pull decreases by 5%.
The chain speed is increased by 28%, the circumferential driving force is decreased by 30%, the chain tension is decreased by 26%, and the power is decreased by 10%. It can be seen that, under the premise of constant capacity, as the thickness of heavy feeder feed thickness decreases, the chain speed increases, the power of motor decreases not much, but the driving circumferential force and chain pull force on the chain decrease more.
The drive circumferential force and chain pull force on the chain are decreased greatly. Therefore, in the design, controlling and selecting the proper feed thickness has a great influence on the chain selection and life.
Therefore, controlling and selecting the right feed thickness has a great influence on the chain selection and life.

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