Over 10,000+ customers' choice, Focus on screening industry 40+ years
In large‑scale spice production, the pre‑screening step typically faces the following three practical challenges:
1. High material throughput – screening speed cannot keep up with line rhythm. Large‑scale spice processing lines often run 24/7, handling several to several tens of tonnes per hour. Under such conditions, ordinary vibrating screens have long material residence times and slow discharge, making the screening step a capacity bottleneck. The structural design of traditional screens requires material to travel from the centre of the screen to the edge to be discharged, consuming a significant portion of screening time.
2. Fine powders easily blind the screen – production lines forced to stop frequently for cleaning. Spice powders such as chilli powder, Sichuan pepper powder and ginger powder, due to the natural moisture content of the raw materials, can absorb moisture from the air over time and become slightly sticky. When ordinary screening equipment operates, these fine powders tend to adhere to the screen surface, gradually forming a "powder film" that rapidly reduces screening efficiency and eventually forces the line to stop for cleaning. The problem of screen blinding is even more pronounced for finer spice powders.
3. Many types of foreign matter – manual sorting is inefficient and has a high miss rate. The types of foreign matter that can be mixed into spice raw materials are diverse: plastic bag fragments, woven bag threads, plant stem residues, stone particles, packaging tie strings, etc. Traditional manual visual sorting can only detect one type of foreign matter at a time, making it extremely inefficient when facing multiple impurities. Ordinary vibrating screens cannot automatically separate these foreign matters, so manual inspection is still required after screening. This extends the pre‑screening time, increases labour costs, and the risk of foreign matter slipping through due to human error remains.
The design logic of the direct discharge screen is simple – to make material pass through the screen surface by the shortest path.
Unlike ordinary vibrating screens, the inlet and outlet of a direct discharge screen are arranged on the same vertical axis. Material enters from the top, acceptable material passes through the screen and falls directly vertically to the bottom outlet without needing to move to the edge. Impurities move along the screen surface to a side reject port and are automatically discharged.
The result of this structural change is direct. The horizontal travel distance of material on the screen surface is minimised, residence time is greatly shortened, and discharge speed is significantly increased. With the same screen area, a direct discharge screen typically handles 40%-60% more material than a traditional vibrating screen, with hourly throughput ranging from several to several tens of tonnes, supporting continuous automated production lines.
The key feature that distinguishes the Gaofu spice double motor direct discharge vibrating screen from single‑motor units is the two vibration motors symmetrically mounted on both sides of the screen body, working together.
A single‑motor direct discharge screen mainly produces vertical vibration on the material and cannot automatically discharge. The dual‑motor version makes the material move in a spiral three‑dimensional motion on the screen surface, providing automatic discharge and automatic screening functions. When the two motors operate together, the excitation forces generated by the eccentric weights add up, creating a composite vibration field in three directions – horizontal, vertical and tilting. The excitation force is stronger and more uniform than that of a single‑motor unit.
This motion pattern has two direct benefits for spice powder impurity removal. First, as the material moves in a three‑dimensional rotating motion on the screen surface, powder and lumps are fully dispersed, and soft agglomerates are naturally broken apart. Second, screening time is greatly shortened – fine powder quickly passes through the screen, while coarse impurities are automatically discharged from the reject port.
When handling large material volumes, the advantage of the dual‑motor structure is particularly evident. The shortcomings of single‑motor equipment under heavy load – increased machine vibration and higher failure rates – are effectively solved in the dual‑motor direct discharge screen. Under high‑capacity continuous operation, the failure rate of the Gaofu dual‑motor direct discharge screen can be kept low, meeting the rigid requirements of large‑scale spice production lines for equipment reliability.
Spices are used directly in food processing, so screening equipment must meet clear hygiene standards for material and sealing.
The Gaofu dual‑motor direct discharge vibrating screen has been systematically configured for this dimension. In terms of material, all parts that contact the raw material are made of 304 food‑grade stainless steel. The surface is mirror‑polished, with no hygiene dead corners, preventing material residue and cross‑contamination. For applications requiring even higher cleanliness, 316L stainless steel is also available.
In terms of sealing, the whole machine has a fully enclosed structure with high‑quality seals. During operation, there is zero dust leakage – avoiding material waste and cross‑contamination while improving the workshop environment. The fully enclosed design also prevents external moisture and foreign matter from entering the screening system, further ensuring the purity of the spice powder.
For spice enterprises, this design helps them meet the high production environment requirements of food GMP standards and HACCP systems at the source, providing reliable compliance evidence during audits and factory inspections.
Spice production lines are highly sensitive to equipment maintenance efficiency. Long screen change times and frequent stoppages are common pain points of ordinary screening machines.
The Gaofu dual‑motor direct discharge vibrating screen uses a high‑strength L‑shaped hollow screen frame structure that is interchangeable with international standard frames. The screen is tensioned well for long service life, and screen changes can be completed within 5 minutes. When switching between different spice varieties or changing mesh sizes, operators can quickly change the screen without special tools, greatly reducing downtime for maintenance.
In addition, all internal and external parts of the equipment are designed with rounded corners for easy cleaning, with no dead corners, further reducing cleaning time between batches.
Considering the technical characteristics of the Gaofu dual‑motor direct discharge vibrating screen, it brings the following five benefits to spice pre‑screening operations:
1. High‑throughput impurity removal that matches line rhythm. The excitation force generated by the dual‑motor drive gives a high processing capacity per unit time. Combined with the vertical discharge structure of the direct discharge screen, discharge speed is high, matching the continuous rhythm of a spice production line.
2. Automatic reject discharge, replacing manual sorting. Threads, lumps, packaging debris and other foreign matter mixed into the raw material are intercepted by the screen and automatically move to the side reject port for discharge. The equipment is often referred to by customers as the "quality inspector" on the production line – it automatically separates foreign matter before raw material enters production, saving labour and avoiding customer complaints caused by foreign matter.
3. Fine impurity removal to improve product purity. Screen mesh sizes can be flexibly configured according to needs, effectively intercepting foreign matter and lumps larger than the mesh opening, controlling product purity.
4. Stable operation for worry‑free continuous production. The equipment can run 24/7 with controlled noise levels. The fully enclosed dust‑proof structure reduces dust escape and material loss, meeting the environmental and cleanliness requirements of modern spice processing workshops.
5. Easy maintenance to reduce total cost. The quick‑change screen structure limits screen change time to 5 minutes. The food‑grade stainless steel reduces cleaning time, and the durability of the dual‑motor design lowers the frequency of spare parts replacement.
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.
