Over 10,000+ customers' choice, Focus on screening industry 40+ years
1. Broken pellet separation to ensure pellet uniformity. During pelleting, crushing and conveying, fish feed inevitably generates a certain proportion of broken and irregular pellets. Broken pellets mixed into the finished product directly affect the appearance and feeding performance of the feed. The rotary vibrating sieve effectively separates broken pellets from whole pellets through precise screen mesh configuration, ensuring uniform finished pellets.
2. Fines removal to control fines content. Fines are one of the most strictly controlled indicators in fish feed screening. Excessive fines content not only reduces feed utilisation efficiency but also disperses rapidly in water during feeding, causing water pollution and feed wastage. The rotary vibrating sieve thoroughly removes fines from the finished product through multi‑deck screen design, keeping fines content within standard limits.
3. Caking removal to ensure smooth feeding. Fish feed is prone to caking due to moisture or compression during storage and transport. If caked material enters the feeding system, it may block the feed inlet and pipelines, causing feeding interruptions. The rotary vibrating sieve intercepts lumps on the screen surface and discharges them automatically, ensuring the smooth operation of subsequent feeding processes.
The Gaofu S49 series fish feed rotary vibrating sieve uses a vertical vibration motor as the excitation source. Eccentric weights installed at the upper and lower ends of the motor shaft convert the rotational motion into a horizontal, vertical and tilting three‑dimensional compound vibration – known as "three‑dimensional vibration". This compound vibration is transmitted to the screen deck, causing the material to move on the screen surface in an expanding spiral‑involute trajectory, spreading from the centre outwards.
This three‑dimensional motion offers three advantages for fish feed screening:
First, thorough material loosening. Fish feed pellets continuously tumble and shift under three‑dimensional vibration, avoiding accumulation and blockage on the screen surface. Broken pellets, fines and whole pellets naturally stratify during motion – whole pellets move toward the periphery, while broken pellets and fines tend toward the centre for passage through the mesh.
Second, extended screening path and high accuracy. The material travels along an involute trajectory on the screen surface, with a path length far greater than that of linear screening, so every pellet has more opportunities to contact the screen. Screening accuracy can reach up to 600 mesh (0.02 mm) and filtration precision down to 5 microns.
Third, adjustable motion trajectory. By adjusting the phase angle of the upper and lower eccentric weights, the motion trajectory and residence time of the material on the screen surface can be changed. For different fish feed varieties and forms, the parameters can be flexibly adjusted to achieve the optimal screening effect.
1. Multi‑deck classification – one feed, multiple fractions. Fish feed products require a wide range of particle sizes, from powder to pellets. The Gaofu S49 series rotary vibrating sieve supports 1 to 5 screen decks, allowing a single feed to complete multiple steps simultaneously. In a typical three‑deck configuration: the top deck removes lumps and large impurities, the middle deck collects the target‑size finished feed, and the bottom deck separates fines and fine broken particles. One machine replaces multiple single‑deck screens in series, reducing equipment investment and process transfer time.
2. Quick screen change – adapting to alternating multi‑variety production. There are many varieties of aquatic feed – fry feed, adult fish feed, shrimp feed, crab feed – and different varieties require different mesh sizes. The Gaofu S49 series rotary vibrating sieve uses a mother‑child screen frame structure, allowing screen changes in just 3 to 5 minutes. The mother screen provides structural support, while the fine screen (working screen) performs the screening. When the fine screen wears out or a different mesh size is needed, only the fine screen needs to be replaced; the mother screen can be used for a long time. This design is particularly suitable for multi‑variety, small‑batch alternating screening scenarios.
3. Anti‑blinding design for high‑oil materials. Fish feed contains high levels of animal protein and oils, which tend to adhere to the screen surface during screening, causing pasting and blinding. The Gaofu fish feed rotary vibrating sieve is equipped with a bouncing ball cleaning system – food‑grade silicone balls are placed under the screen deck, continuously tapping the screen during operation to dislodge adhering material and keep the mesh clear. For ultra‑fine powders or more sticky materials, an optional ultrasonic cleaning system can be added, using high‑frequency vibration to effectively break the adhesion between the material and the screen.
4. Fully enclosed food‑grade structure – ensuring feed hygiene safety. Fish feed is directly related to the food safety of aquaculture products, so production equipment must meet strict hygiene standards. All material‑contact parts of the Gaofu fish feed rotary vibrating sieve are made of 304 food‑grade stainless steel, with finely polished surfaces, no hygiene dead corners, and easy to clean. The equipment has a fully enclosed sealed structure, with screening taking place inside a sealed chamber – no dust escape, no material leakage – reducing material loss and improving the workshop environment.
5. Continuous automatic discharge – supporting large‑scale production. After traditional screening equipment runs for a period, impurities accumulate on the screen surface and require stoppage for cleaning. With the Gaofu fish feed rotary vibrating sieve, caked material, impurities and oversize particles automatically move along the screen surface to the reject port and are discharged. The equipment can run 24 hours continuously, with a single unit handling several to several tens of tonnes per hour, effectively supporting the continuous operation of large‑scale aquatic feed production lines.
The Gaofu S49 series fish feed rotary vibrating sieve is suitable for multiple stages of aquatic feed processing:
Extruded pellet feed classification. Extruded feed is one of the most widely used feed forms in aquaculture. The rotary vibrating sieve classifies extruded pellets by size while removing broken pellets and fines, ensuring uniform finished pellets and compliant fines content.
Crumbled pellet feed screening. Crumbled feed is an intermediate form between powder and pellets, commonly used for fry and juvenile fish culture. The rotary vibrating sieve simultaneously separates fines and oversized particles from the crumbled feed to obtain the target‑size finished crumbled product.
Ultra‑fine feed screening for shrimp and crab feeds. Shrimp and crab feeds typically require higher fineness, with some products needing screening to 150 mesh or finer. The rotary vibrating sieve meets the precision requirements of ultra‑fine feeds through high‑mesh screen configurations.
Raw material pre‑cleaning. Feed raw materials such as fish meal, soybean meal and corn meal must be screened to remove stones, dirt, twine, lumps and other impurities before entering the pelleting process. The rotary vibrating sieve performs preliminary cleaning at the raw material receiving stage, providing clean raw materials for subsequent processes.
About Gaofu
Xinxiang Gaofu Machinery Co., Ltd. was originally founded in the 1980s. After more than 40 years of development, the company has become a "National Specialized and Sophisticated 'Little Giant' Enterprise", a "National Green Factory", a "National High-tech Enterprise", a "National Intellectual Property Advantage Enterprise", and the "President Unit of the Vibration Association". It also hosts the "Henan Provincial Industrial Design Center", the "Henan Provincial Engineering Technology Research Center for Intelligent Online Screening Systems", and the "Xinxiang Municipal Engineering Technology Research Center for Fine Screening". The company has been granted more than 500 invention, utility model and design patents, has received the "Science and Technology Achievement Award" issued by the Ministry of Industry and Information Technology, and has participated in drafting four "National Standards".
Gaofu's product portfolio covers several series and hundreds of varieties, including vibrating screening equipment, conveying equipment, coal crushing equipment, filtration equipment, and automated material handling systems. Its main products include vibrating screens, screening machines, vibrating sifters, rotary vibrating screens, ultrasonic vibrating screens, linear screens, air flow screens, gyratory screens, roller screens, dewatering screens, bar screens, vacuum feeders, dust-free feeding stations, ton bag feeding stations, feeding systems, automatic powder feeding systems, automatic slag discharge filters, leaf filters, clay filters, toothed roll crushers, coal crushers, and other equipment. These are widely used in many industries such as food, pharmaceuticals, chemicals, metallurgy, building materials, mining, thermal power, and environmental protection, earning the trust and praise of over 10,000 customers worldwide.
Gaofu products are not only popular in Greater China but are also exported to more than 100 countries and regions, including Russia, Canada, the United States, New Zealand, Japan, Brazil, South Africa, etc. The company adheres to its mission: "Enhance material quality and efficiency, meet customer needs", walking side by side with customers for harmonious and win-win cooperation. Today, Gaofu has become an approved supplier to many Fortune 500 companies, including CNPC, Sinopec, Sinochem Group, China Resources Group, Sinopharm Group, COFCO Group, China National Building Material Group, China Aerospace, and Jinchuan Group.
Gaofu Machinery – Global No.1 in Vibrating Screen Sales. In May 2024, Frost & Sullivan, an international authoritative advisory firm, based on its research on the global vibrating screen market and calculated according to global vibrating screen sales volume in 2023, issued a market position confirmation certificate to Gaofu Machinery.
