Over 10,000+ customers' choice, Focus on screening industry 40+ years
Salt dust generated during transfer has multi‑dimensional impacts:
Equipment corrosion. Salt is highly hygroscopic. When salt dust settles on equipment surfaces, it absorbs moisture from the air, forming salt deposits that accelerate electrochemical corrosion of metal equipment. Over time, equipment surfaces rust, structural strength degrades, and maintenance frequency and replacement costs increase. 316L stainless steel – with its added molybdenum content – offers superior resistance to pitting and crevice corrosion compared to 304 stainless steel, making it particularly suitable for conveying highly corrosive materials such as high‑salt and acidic seasonings.
Material loss. Every dust emission represents raw material spillage and waste. In large‑scale production, the cumulative salt dust loss during transfer is a cost that cannot be ignored – not only product loss but also increased cleaning labour input.
Workshop environmental pollution. Salt dust suspended in the workshop air settles on walls, floors, and equipment surfaces – affecting workshop cleanliness and increasing cleaning burdens. For food production workshops, salt dust accumulation can also become a breeding ground for microorganisms.
Employee health impact. Long‑term exposure to high‑concentration salt dust environments can irritate operators' respiratory systems. Salt dust also irritates skin and eyes. Improving dust control at the transfer stage is a basic health protection measure for frontline workers.
Safety hazards. Dust generated during salt conveying is a primary safety concern. Dust accumulation not only affects equipment operation but may also, under certain conditions, create safety risks.
Traditional salt transfer methods – whether manual handling, screw conveyors, or bucket elevators – struggle to fundamentally solve dust emission problems. Their common limitation is that material is exposed to air during transfer, or the equipment itself cannot be fully enclosed.
Gaofu's food‑grade salt vacuum conveyor takes a completely different technical path: using negative pressure as the driving force and piping as the channel, salt is "automatically transported" to the target location in an enclosed environment.
Working principle. The vacuum pump evacuates the system, creating a vacuum state at the suction nozzle inlet and throughout the system. Salt particles are drawn into the suction nozzle with outside air, forming an air‑material mixture that travels through the enclosed conveying pipe to the hopper. After air‑material separation in the hopper, the separated material enters the receiving equipment. Conveying and discharge are controlled by pneumatic three‑way valves that open and close automatically, managed by a central control unit.
The equipment is equipped with a compressed air pulse‑jet cleaning system that blows back through the filters during each discharge cycle, dislodging powder adhering to the filter surface to ensure continuous and stable conveying.
The key difference is: salt is no longer exposed to workshop air – it is transferred from one point to another entirely within enclosed piping. The entire conveying process takes place in a sealed system with no powder leakage. This fundamental difference gives vacuum conveying inherent advantages over traditional transfer methods when handling fine powders like salt.
Salt production workshops have special material requirements – the equipment must resist salt corrosion while meeting food hygiene standards.
304/316L food‑grade stainless steel. All parts that directly contact salt – including hoppers, conveying pipes, suction lances, and filters – are made of food‑grade 304 or 316L stainless steel. 316L stainless steel, with its added molybdenum content, offers excellent resistance to chloride ion corrosion, making it particularly suitable for conveying highly corrosive food materials such as high‑salt and acidic products. Internal and external surfaces are mirror‑polished to a surface roughness of Ra≤0.8μm, preventing material adhesion and residue.
Food‑grade seals. Seals are made of FDA‑compliant food‑grade materials, ensuring the airtightness of the entire conveying system and preventing dust leakage and external contamination.
Fully enclosed pipe conveying completely eliminates dust emission. The equipment uses a fully enclosed negative‑pressure conveying system – the entire transfer process is completed within enclosed piping, completely eliminating material "spillage, leakage, emission, and drip" during transfer. Fully enclosed pipe conveying is dust‑free and leak‑free, keeping the workshop clean. For dust‑prone materials like salt, this means dust has no opportunity to disperse at the transfer source.
"Zero" residue in piping reduces material loss. Enclosed pipe conveying means no spillage or waste during transfer. The internal surfaces of conveying pipes are mirror‑polished, leaving minimal material residue, with very little material loss during conveying.
Salt has three core characteristics: strong hygroscopicity, easy lumping, and high corrosiveness. Gaofu's food‑grade salt vacuum conveyor incorporates specific design optimisations to address these.
Anti‑bridging design. The hopper is equipped with an intelligent micro‑vibration anti‑bridging device that continuously breaks up slightly caked salt particles caused by moisture, preventing material bridging, wall adhesion, and blockage – ensuring continuous and uniform discharge. The fully enclosed negative‑pressure environment significantly isolates air and moisture, fundamentally reducing the probability of salt moisture absorption and lumping.
Corrosion‑resistant structure. The entire piping system, hoppers, and discharge components are constructed of thickened, corrosion‑resistant stainless steel – capable of withstanding long‑term salt spray corrosion, preventing equipment rusting that could generate metal particles contaminating food raw materials. 316L stainless steel, in particular, offers excellent resistance to acids, alkalis, and salt solutions.
Low‑velocity conveying. To suit salt's granular characteristics, low‑velocity dense‑phase negative‑pressure conveying technology is used, combined with large‑radius smooth piping – reducing airflow impact force and particle‑to‑wall friction, preventing salt particle breakage and fines generation.
Gaofu's food‑grade salt vacuum conveyor is used in the following salt production workshop applications:
Cross‑process transfer of finished salt. Enclosed conveying of refined salt from the drying stage to the packaging stage – no dust emission throughout, ensuring finished salt purity. Semi‑finished products from the dewatering system to the batching and packaging system are conveyed using fully enclosed pneumatic conveying – significantly reducing product quality risks associated with traditional belt conveying methods.
Cross‑area transfer of industrial salt. Enclosed conveying of industrial salt from storage areas to production areas – with no mechanical contact throughout, avoiding material loss caused by friction from traditional belt conveyors, screw conveyors, and other equipment. Conveying distance can be flexibly configured according to workshop layout, unrestricted by space constraints.
Precise feeding in seasoning production. Automatic conveying of salt to seasoning batching systems at set rates. Combined with intelligent control systems for precise feeding, avoiding material waste and ensuring batching accuracy.
Cross‑contamination prevention in multi‑product changeover production. Quick‑release structural design with no dead corners, easy to inspect and clean – particularly suitable for multi‑product changeover production, effectively preventing cross‑contamination.
Fully automatic linked control. The system is equipped with high‑precision level sensors that monitor material inventory in packaging machine hoppers in real time – achieving closed‑loop automatic operation with low‑level automatic suction and full‑level automatic shutdown with pressure holding, requiring no manual attendance throughout.
Food Industry Client Testimonials
Nestlé, CP Group, Haitian Flavour & Fragrance, Yihai Kerry, Yili, Mengniu,Shuanghui, Wahaha, Master Kong, Want Want, Anjoy Foods, Angel Yeast,Yangyuan Foods, Uni-President Enterprises, Qiaqia Food, Luhua Group,Alpenliebe, Golden Monkey, Orion, Xizhilang,Sanquan Foods, Synear Food, Oishi, Wong Lo Kat, Yanjing Beer, Seamild,Jinpai, Chubang, Hengshun Vinegar Industry, Longda Group, Beijing Daoxiangcun, Anhe Dairy,Weiwei Group, Xiangpiaopiao, Maiquer, Tianbing, Binqi Food, Ligao Okun
Fortune 500 Client Testimonials
CNPC、CSCEC、Sinochem Holdings、CRCC、China Minmetals Corporation、CNOOC、CR、Sinopharm、CHN Energy、COFCO Corporation、Huawei Technologies、PowerChina、CITIC Group、Wuchan Zhongda Group、NORINCO、Chalco、CNBM、 Shaanxi Coal and Chemical Industry Group、Ansteel Group、CETC、CSSC、CASC、CEC、Jinchuan Group、CASIC、Conch Cement、CNNC、SPH、Shanxi Coking Coal Group、 Zhongtai Chemical、GPHL、DEC、Sinosteel Corporation、MCC、China National Salt Industry Chemical、China Baowu Steel Group、China Animal Husbandry Industry Co., Ltd.、CECEP
About Gaofu
Xinxiang Gaofu Machinery Co., Ltd. was founded back in the 1980s. With over 40 years of development, it has been certified as a National-level Specialized, Refined, Unique & Innovative Little Giant Enterprise, National Green Factory, National High-tech Enterprise, and National Intellectual Property Advantage Enterprise, and serves as the President Unit of China Vibration Screening Industry Association.
The company is accredited with the Henan Provincial Industrial Design Center, Henan Provincial Engineering Technology Research Center for Intelligent On-line Screening System, and Xinxiang Municipal Engineering Technology Research Center for Fine Screening.
Gaofu has obtained more than 500 patents including invention patents, utility model patents and design patents, been awarded the Science and Technology Achievement Prize issued by the Ministry of Industry and Information Technology of China, and participated in drafting and formulating 4 national standards.
Gaofu's product portfolio covers multiple series and hundreds of specifications, including vibrating screening equipment, conveying equipment, coal crushing equipment, filtration equipment and automatic material handling systems.
Core products include vibrating screens, screening machines, vibratory sifters, rotary vibrating screens, ultrasonic vibrating screens, linear vibrating screens, airflow screens, gyratory screens, roller screens, dewatering screens, bar screens, vacuum feeding machines, dust-free feeding stations, bulk bag feeding stations, feeding systems, automatic powder feeding systems, automatic slag-discharging filters, leaf filters, clay filters, toothed roll crushers, coal crushers and other machinery.
These products are widely applied in food, pharmaceutical, chemical, metallurgy, construction materials, mining, thermal power, environmental protection and many other industries, winning recognition and trust from over 10,000 clients worldwide.
Gaofu products enjoy strong sales across Greater China, and are exported to more than 100 countries and regions such as Russia, Canada, the United States, New Zealand, Japan, Brazil and South Africa.
Upholding the corporate mission of Improving material quality & efficiency to fully satisfy customer demands, Gaofu maintains long-term partnerships with clients to achieve win-win development.
At present, Gaofu is an official qualified supplier for numerous Fortune Global 500 enterprises, including CNPC, Sinopec, Sinochem Holdings, China Resources Group, Sinopharm Group, COFCO, China National Building Material, China Aerospace Science and Technology Corporation, Jinchuan Group and more.
Gaofu Machinery ranks No.1 in global sales volume of vibrating screens.
In May 2024, Frost & Sullivan, a world-renowned international consulting firm, issued a Market Position Verification Certificate confirming that Gaofu achieved the world's largest shipment volume of vibrating screens in the global market in 2023.
