Over 10,000+ customers' choice, Focus on screening industry 40+ years
As an indispensable seasoning in daily diets, salt has long been produced on an industrial, large‑scale basis. In salt manufacturing enterprises, processing hundreds or even thousands of tons of raw salt per day has become the norm. However, high throughput not only brings higher efficiency but also poses serious challenges to the screening process.
Conventional vibrating screens, while offering considerable capacity, tend to damage the crystal structure of salt particles due to high‑speed vibration, resulting in increased fines and broken grains. Once the surface of a salt particle is damaged, it not only affects the appearance and taste of the product but also exacerbates moisture absorption and caking during transportation and storage. On the other hand, if screening speed is reduced to protect particle integrity, it becomes difficult to meet high‑throughput production demands.
So, is there a piece of equipment that can achieve both high‑capacity screening and gentle protection of salt particle integrity?
Gaofu Machinery's Salt Tumbler Screen is a practical solution designed precisely for this need. Using a low‑frequency, circular motion that mimics manual shaking, it achieves high‑throughput classification while effectively protecting salt particles – helping salt producers maintain product quality in large‑scale production.
The Importance of Particle Size Classification According to National Standards
According to GB/T 13025.1 "General Test Methods for Salt Industry – Determination of Particle Size", particle size is a key quality indicator for salt. Whether for table salt or industrial salt, there are clear testing methods and quality requirements. The uniformity of table salt particles directly affects dissolution rate and taste perception, while the particle size of industrial salt influences the stable operation of downstream production processes.
Three Technical Difficulties in Salt Screening
Difficulty 1 – Particle protection. Salt crystals are fragile. The high‑frequency impact of ordinary vibrating screens can break salt particles, generating excessive fines and affecting yield and appearance. Some brittle, granular crystalline materials are prone to breakage under high‑speed vibration, while the gentle, manual‑shaking‑like motion of a tumbler screen effectively avoids this problem.
Difficulty 2 – Classification accuracy. From coarse salt to fine salt, salt production often requires simultaneous separation into multiple particle size fractions. A conventional single‑deck screen can only produce two fractions – "passed" and "failed" – making it difficult to achieve fine classification.
Difficulty 3 – Screen blinding. During screening, salt can produce fines or absorb moisture, leading to screen blinding. This reduces screening efficiency and increases cleaning frequency.
The Gaofu Salt Tumbler Screen is designed to address these three difficulties, providing targeted solutions for particle protection, classification accuracy, and anti‑blinding performance.
Working Principle: Mimicking the Human Eye and Hands
The design of the Gaofu GFBD Series Salt Tumbler Screen draws inspiration from the oldest and most reliable screening action – the human eye watching and both hands shaking. Through an adjustable eccentricity exciter, it generates a non‑linear three‑dimensional motion that makes the material travel in a spiral‑involute path across the screen deck, achieving a "gentle yet powerful" screening effect.
Unlike the high‑frequency vibration of traditional rotary vibrating screens, the tumbler screen operates at a low rotational speed (120‑360 rpm, adjustable) with a large displacement planar gyratory motion. This design allows the material to roll and stratify gently on the screen surface, with an acceleration only a fraction of that of ordinary vibrating screens, effectively reducing impact on salt crystals.
Multi‑Deck Classification: One Machine, Multiple Fractions
The Gaofu GFBD Series Tumbler Screen uses a multi‑deck screen structure, with 1 to 5 decks available depending on requirements. Taking the most common three‑deck configuration for salt production as an example:
The first deck removes coarse particles larger than the desired upper limit
The second deck separates the target‑size finished salt
The third deck removes fines and ultra‑fine particles
One machine, one feed – simultaneously achieving multi‑fraction classification, greatly improving production efficiency while saving valuable floor space in the workshop.
Core Structure and Materials
The Gaofu GFBD Series Tumbler Screen uses 304 or 316L food‑grade stainless steel for all material‑contact parts, including the screen box, screen frames, inlet and outlet ports, eliminating any risk of product contamination. The screen frame design allows quick mesh changes, simple to operate and reducing downtime.
1. High Capacity to Meet Large‑Scale Production
In the salt industry, throughput is one of the key indicators of a machine's economic value.
The Gaofu Salt Tumbler Screen is designed with high capacity as a priority. In a real‑world example, for the ecological salt classification project of Hunan Xiangli Salt Chemical Co., Ltd., one tumbler screen achieved a primary screening capacity of 18 tonnes per hour, and a secondary screening capacity of 8 tonnes per hour. This level of throughput fully satisfies the continuous operation demands of large‑scale salt producers.
2. Preserves Salt Crystal Shape, Enhances Product Value
The intactness of salt particles directly affects the appearance quality and market value of finished table salt. The Gaofu Salt Tumbler Screen uses a low‑frequency gyratory motion that imposes far less impact on salt particles than conventional vibrating screens, effectively maintaining the original shape and surface smoothness of the salt crystals.
This advantage is especially significant for flake salt, granular salt and other products that demand good crystal morphology. The gentle screening process reduces broken grains and fines, improving yield while enhancing product added value.
3. High Classification Accuracy, Precisely Matching National Standards
The Gaofu GFBD Series Tumbler Screen achieves a screening accuracy of 90% to over 95%. By equipping different mesh sizes, it can precisely match the full range of particle size requirements for table salt, from coarse to fine.
In the industrial salt field, the tumbler screen also performs excellently, meeting the strict particle size standards required by downstream industries such as chemicals and water treatment.
4. Effective Anti‑Blinding, Reducing Downtime for Cleaning
Screen blinding is a common headache during salt screening. The Gaofu GFBD Series Salt Tumbler Screen is equipped with multiple anti‑blinding devices – a standard bouncing ball system that continuously taps the screen cloth during operation, effectively preventing salt adhesion and fine particle blockage. For high‑moisture or high‑tendency caking salt materials, an optional ultrasonic system can further enhance anti‑blinding performance.
5. Fully Enclosed Structure, Environmentally Friendly and Safe
The Gaofu Salt Tumbler Screen features a fully enclosed design. Screening takes place inside a sealed chamber, so no dust escapes. For salt producers, this not only means a cleaner workshop environment and better material recovery, but also compliance with increasingly strict environmental and safety regulations, reducing the health impact of dust on operators.
Efficiency Value – Ensuring Continuous Production Line Operation
The salt tumbler screen supports continuous operation, with impurities and off‑spec particles automatically discharged without frequent manual intervention. For large‑scale salt production lines that run 24/7, this means no production interruptions and no loss of capacity.
Quality Value – Quality Assurance Starting at Screening
Quality control of table salt should begin at the source of production. The Gaofu Salt Tumbler Screen ensures uniform salt particles and good appearance through accurate classification and gentle screening. Whether it is the oversize fraction, the target‑size finished salt, or the fines, each fraction falls into its designated collection system in strict accordance with the specified quality targets.
Cost Value – Lower Maintenance
The GFBD Series Tumbler Screen is designed with low energy consumption. Motor power ranges from 0.75 kW to 5.5 kW depending on the model, keeping operating costs manageable. At the same time, because the acceleration is much lower than that of conventional vibrating screens, screen mesh life is longer, wear on components is reduced, and maintenance frequency and repair costs are correspondingly lower.
Service Value – Over 40 Years of Professional Expertise
Since its founding in the 1980s, Gaofu Machinery has become a "National Specialized and Sophisticated 'Little Giant' Enterprise" and a "National Green Factory", with more than 500 granted patents. Its products are exported to over 100 countries and regions, serving more than 10,000 customers worldwide. In the salt industry, Gaofu has provided mature and reliable screening solutions to many domestic and international salt producers.
Refined salt classification – multi‑fraction separation of coarse, medium and fine salt, precisely matching national standard particle size requirements
Sea salt / lake salt processing – integrated coarse salt de‑dusting and fine classification
Industrial salt preparation – meeting particle size standards for chemical, water treatment, de‑icing and other applications
Seasoned salt production – medium to high‑end table salt products that require high particle uniformity
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.
