Over 10,000+ customers' choice, Focus on screening industry 40+ years
The working principle of the Gaofu rice vacuum conveying equipment can be summarised in one sentence: using air pressure difference to make rice automatically complete cross‑workshop transfer in an enclosed pipeline.
When the vacuum pump starts, it continuously removes air from the conveying pipeline and the vacuum hopper, creating a negative pressure state inside the system that is lower than the outside atmospheric pressure. Rice grains, together with outside air, are drawn into the suction nozzle, forming an air‑material mixture that travels through the enclosed conveying pipe to the vacuum hopper. Inside the hopper, the rice is separated from the air by a filter – air passes through the filter element and is exhausted, while the rice is intercepted on the outside of the filter and settles to the bottom of the hopper under gravity. When the material accumulates to a preset level, the discharge valve opens automatically and the rice falls into the receiving equipment.
The entire conveying process is automatically controlled by a PLC, with suction and discharge cycles completed automatically. Each time the material is discharged, a compressed air pulse reverse‑cleaning device automatically blows the powder adhering to the filter surface, restoring the filter element's permeability.
The fully enclosed pipeline is the core carrier of this system. From entering the suction nozzle to reaching the receiving equipment, the rice travels entirely inside an enclosed stainless steel pipeline, without contact with outside air, without contact with operators, and without exposure to the workshop environment.
Cross‑workshop transfer in rice mills has rigid requirements for conveying distance. From the paddy cleaning workshop to the milling workshop, and from the milling workshop to the packing workshop, the horizontal distance often reaches several tens of metres, and when combined with cross‑floor vertical lifts, the total conveying distance is even greater.
The Gaofu vacuum conveying equipment covers a conveying capacity range of 200 to 6,000 kg/hour with a power range of 1.5 to 18.5 kW. For long‑distance conveying, the equipment supports horizontal conveying of 10 to 50 metres and vertical conveying of 3 to 15 metres.
Different models suit different conveying distances and capacity requirements. Taking the GFZK‑600 series as an example, the 7.5 kW dual‑motor configuration can achieve 2,000 to 4,000 kg/hour within a conveying distance of 10 metres. The 11 kW dual‑motor configuration can maintain a conveying capacity of 2,000 to 6,000 kg/hour at a conveying distance of 20 metres.
Relationship between conveying distance and capacity. It should be noted that conveying capacity decreases to a certain extent as conveying distance increases. In actual engineering design, the Gaofu technical team will carry out precise selection calculations and system configurations based on the specific conveying distance, vertical height, pipeline routing and material characteristics of the rice mill, ensuring that the equipment maintains stable and efficient conveying performance under cross‑workshop long‑distance transfer conditions.
For ultra‑long distances or complex routing requirements, Gaofu can also provide staged pressurisation or multi‑point relay conveying solutions, splitting the long‑distance transfer into multiple shorter sections to ensure that the conveying efficiency of each section is at its optimum.
As a granular material, rice differs significantly from powder materials in conveying characteristics. Based on general vacuum conveying technology, the Gaofu rice vacuum conveying equipment incorporates several specialised design features to address the specific properties of rice.
Low‑breakage conveying design. During conveying, the collision between rice grains and the pipe wall is the main cause of broken rice. The Gaofu vacuum conveying equipment uses a negative pressure suction method, where the material is suspended in the pipeline rather than being mechanically forced forward. The collision intensity between grains and the pipe wall is far lower than in mechanical conveying methods such as screw conveyors and bucket elevators. The appropriate conveying airflow velocity design further reduces the frequency of collision between grains, effectively controlling the broken rice rate during conveying.
Food‑grade stainless steel. Rice comes into direct contact with food, so the conveying equipment material must meet clear hygiene requirements. All parts of the Gaofu vacuum conveying equipment that contact material – pipelines, hoppers, suction nozzles, discharge valves, etc. – are made of food‑grade stainless steel, with finely polished surfaces, no hygiene dead corners, and easy to clean. The equipment complies with the hygiene standards of the food processing industry and is suitable for large‑scale continuous production in rice mills.
Fully enclosed dust‑proof structure. Rice bran and fine dust generated during rice conveying are locked inside the enclosed pipeline and do not escape into the workshop environment. The equipment has no gaps or dead corners where material can accumulate, and surfaces are easy to inspect visually. The fully enclosed design also effectively blocks external moisture and foreign matter, preventing the rice from absorbing moisture or becoming contaminated during conveying.
Flexible pipeline routing. The conveying pipeline can be flexibly arranged according to the workshop layout of the rice mill, including horizontal, vertical, inclined and curved runs. Pipelines can be routed along walls, ceilings or floors, without being constrained by workshop space, making the production line layout more compact and flexible. For both new rice mills and retrofits of existing workshops, low‑cost equipment deployment can be achieved.
The Gaofu rice vacuum conveying equipment is equipped with a PLC intelligent control system for fully automatic continuous operation. The system supports level interlock control – when the material level of the downstream equipment falls below the set value, feeding starts automatically; when it rises above the set value, feeding stops automatically. The operator simply presets the parameters on the control panel, and the system automatically completes the cycle of "suction – separation – discharge – reverse cleaning" without manual intervention.
Each production line requires only 1‑2 attendants. Compared with traditional manual handling, automated conveying greatly reduces labour costs and intensity. At the same time, automated conveying eliminates the quality fluctuations caused by manual operations – correct transfer sequence, no material confusion, no foreign matter contamination – upgrading cross‑workshop transfer from "manual control" to "machine control."
The system can also be connected to the rice mill's MES system for real‑time upload and digital management of raw material usage data. From raw material input to finished product packing, the transfer data of each batch of rice can be traced, providing accurate data support for production management.
About Gaofu Machinery
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, and automated material handling systems. Its main products include one-stop solutions such as automatic feeding systems, powder feeding systems, pneumatic conveying systems, weighing and batching systems, minor ingredient batching systems, water supply systems, oil supply systems, fluid conveying systems, central kitchen powder feeding systems, powder conveying systems, and top-loading feeding systems. The food system production lines mainly include:
Bakery production lines: bread production line, cake production line, shortbread production line, croissant production line, toast production line, pizza production line, biscuit production line, hamburger production line;
Dough product production lines: steamed bun production line, stuffed bun production line, twisted roll production line, sesame paste baked bun production line, steamed dumpling production line, dumpling production line, youtiao (fried dough stick) production line, stuffed pancake production line.
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. They 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. 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.
