The extractor is the most widely used for extracting active ingredients from natural plants. It has been successfully applied in conventional solvent extraction, low-temperature soybean meal processing and ethanol extraction for soybean protein concentrate (SPC).
1. Thin material bed, uniform material distribution,adjustable and frequent spraying with even liquid spreading. These features boost solvent penetration. Effective extraction time≥45min; draining time≥15min; material bed height≤1.3m; residual oil in meal
< 0.5%.
2.Spray pipes can be cleaned online. Spray troughs adopt anti-clog structures with self-cleaning functions during production. This ensures continuous and safe operation and cuts labor workload.
3. Exclusive spray trough design increases spraying frequency for more even liquid distribution without material buildup. Spray volume can be flexibly adjusted. Optimized miscella hoppers control overflow from low-concentration to high-concentration miscella, guaranteeing low residual oil in finished meal.
4.Unique material rake structure levels raw material and further improves miscella penetration.
5.Negative pressure filtration system reduces solvent content in wet meal to below 23%, lowering steam consumption for subsequent desolventizing and improving finished meal quality.
6.Continuous and even material discharge enhances equipment safety and stabilizes downstream desolventizing processes.
7.All bearings of the extractor are externally mounted.
8.Split mechanical seals are adopted for sealing between shafts and the housing.
9.Dual hydraulic motor drive delivers flexible, synchronous transmission with simple control and stable operation. Equipped with explosion-proof variable frequency motors.
10.Specialized design for Soybean Protein Concentrate (SPC) projects. Grate plate backwashing system thoroughly cleans grate plates to enhance penetration. High scrapers divide materials into independent units with soaking zones inside each cell. This prevents cross-flow of miscella at different concentration stages and maintains stable concentration gradients across spraying sections. Optimized spraying units fit low-permeability protein materials; simpler structure, easy cleaning and uniform spraying.
1.Digital design is adopted for the drag chain extractor. 3D models visualize design concepts and precisely define the shape, dimension and assembly relation of all parts. This improves design accuracy and visualization. Virtual simulation and optimization identify potential design defects in advance.
2.The motor adopts radial piston motors with crankshaft swing cylinders. It features simple structure, reliable performance, long service life and low noise. The drive shaft bears radial loads and supports reversible rotation.
3.Dual drive shafts reduce chain tension and contact stress between chains and sprockets. This lessens wear on chain rollers and sprocket teeth.
All key components above are modeled in 3D, then assembled into a complete extractor assembly model. The final effect is shown in the figure below.
Finite Element Calculation & Analysis of Key Components
(1) The pusher plate is a major load-bearing component. It must have sufficient strength and rigidity for safe, stable operation while keeping lightweight to reduce grate plate abrasion, operation resistance and manufacturing costs. Therefore, we carry out optimization design with the mass of the pusher plate as the design objective, the stress and deformation of the pusher plate as design constraints, and the thicknesses of the pusher plate and stiffeners as design variables. After iterative calculation, the optimal scheme is finally obtained, as shown in the figure below.
(2) Extractor Outer Frame: The outer frame of the extractor serves more functions than merely maintaining the regular shape and structural stability of the equipment and bearing its weight under normal production conditions. It also needs to withstand the load generated during the hydrostatic leakage test of the equipment. The solvent used in the extraction process is explosive medium. Any leakage, seepage or overflow on the equipment will not only result in material loss, but also pose a serious threat to workshop safety. To eliminate solvent leakage completely, all equipment in the workshop must undergo hydrostatic leakage testing. Therefore, the load imposed on the outer frame during the hydrostatic test shall be taken into full consideration in the design phase of the extractor.
The calculation results are shown in the figure. The tension, compression, strength, stability and slenderness ratio of each component all meet the service requirements after calculation.
(03) Optimization design of torque arm: the design objective is mass minimization; design variables are the thickness and radius of the torque arm.The optimal solution is obtained after iterative calculation.
The above is a brief introduction to the drag chain extractor. We conduct customized design and engineering analysis for the extractor of every individual project to guarantee stable and successful operation of each unit.
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