Explore our core engineering machinery for heavy industry, flour milling, and raw material transport.
In contemporary material processing facilities, the integrity of the bulk-conveying conduit remains a pivotal determinant of operational efficacy. The Throat Pass System occupies a critical junction where gas-solid phase ratios must be meticulously calibrated. If pressure dynamics fluctuate, system blockages or thermal overload inside rotary airlocks can occur, leading to critical processing downtime.
Henan Jiujie Machine Co., Ltd. addresses this design challenge by engineering high-performance, CE-certified Throat Pass Systems. Built with precision laser-cut tolerances, robust mechanical seals, and automated pressure regulation, our units deliver optimized throughput while minimizing air leakage in high-pressure pneumatic systems.
A leading provider of integrated engineering solutions for the grain and food processing industries.
Henan Jiujie Machine Co., Ltd. is a professional supplier of complete equipment and engineering services for the food production and grain processing industries. Our business covers a wide range of applications, including wheat flour milling plants, feed processing factories, and rice processing plants. Our product portfolio includes conveying equipment, cleaning equipment, flour milling equipment, and other related machinery. Over the years, our products have been widely recognized by customers both in domestic and international markets.
Since its establishment, Henan Jiujie Machine Co., Ltd. has been dedicated to the research and development of grain processing technology and machinery. With extensive industry experience, we are able to provide integrated solutions across the entire grain and food processing industrial chain. Our solutions cover multiple stages, including raw material collection, storage, cleaning, grading, sieving, grinding, mixing, shaping, production, and packaging.
We leverage high-precision CNC manufacturing tooling alongside integrated engineering systems. By keeping design and fabrication in-house, we secure complete control over the dimensional fidelity and metallurgical purity of our Throat Pass Systems.
CNC Machined
Certified Safety
Eco-Clean Tech
Providing the baseline standards for high-capacity industrial plants operating in food-grade or heavy bulk-handling domains.
Global production lines demand zero dust emission profiles and cross-contamination proof paths. The transition between gravity-fed storage silos and positive-pressure pneumatic systems requires a sealed Throat Pass interface to maintain continuous flow rates.
Rotary feeders and screw systems often encounter abrasive dusts like quartz sand, fly ash, or hard wheat. Our Throat Pass systems utilize wear-resistant chromium-carbide overlays and custom-engineered geometries to double the component lifespan.
Deploying machinery into the European Union and allied regions necessitates verifiable compliance with CE directives (Machinery Directive 2006/42/EC). Henan Jiujie ensures all systems ship with complete verification paperwork and technical documentation.
Comprehensive design parameters matching industry-standard requirements.
| Specification Parameter | Standard Duty Config | Heavy Industrial Config | Sanitary Food Grade Config | |
|---|---|---|---|---|
| Nominal Passage Diameter (DN) | 150mm - 300mm | 350mm - 600mm | 100mm - 250mm | |
| Primary Material Composition | Carbon Steel Q235B / Q345B | Alloy Steel with wear-resistant liner | Stainless Steel SUS304 / SUS316L | - |
| Operating Pressure Differential | Up to 0.08 MPa | Up to 0.25 MPa (Dense Phase) | Up to 0.05 MPa | |
| CE Certification Codes | EN ISO 12100:2010 | EN ISO 12100, EN 60204-1 | EN ISO 12100, Food Contact EU 1935/2004 | |
| Application Suitability | Grain Milling, Corn Semolina | Cement, Fly Ash, Quartz Sand | Flour, Starch, Cocoa Powder, Coffee |
To maintain our position in the bulk processing industry, Henan Jiujie Machine Co., Ltd. is continuously developing our component designs. Our current R&D is focused on three main engineering goals:
Implementing real-time internal flow simulation software (CFD) to customize the internal taper of every throat pass system based on the material's specific angle of repose and moisture content.
Integrating ultrasonic wall-thickness sensors to monitor abrasive erosion rates dynamically, sending maintenance alerts before a casing breach occurs.
A dynamic mechanical seal system that automatically increases sealing pressure during system surges, protecting downstream milling machinery.
How we ensure tight tolerances and quality control across all grain processing systems.
Henan Jiujie Machine Co., Ltd. places strong emphasis on technological innovation and continuous improvement of manufacturing capability and product quality. We have introduced a series of advanced processing equipment, including CNC laser cutting machines, CNC bending machines, and CNC lathes.
In addition, we are equipped with CNC machining centers, CNC boring machines, surface grinding machines, planers, and other high-precision manufacturing equipment. We have also established an electrostatic spraying production line to further enhance product surface quality and durability.
Our manufacturing processes include steel plate laser cutting, CNC bending, CO₂ arc welding, argon arc welding, robotic welding, and electrostatic surface treatment. These advanced production technologies ensure consistent product quality and continuous innovation.
Our flour milling equipment has obtained the ISO9001 quality management system certification and CE certification. The environmental protection standards of our equipment comply with relevant EU requirements.
Our grain cleaning process is designed to operate without water usage, ensuring no wastewater discharge and supporting environmentally friendly production. Our products are characterized not only by stable performance but also by easy installation, convenient maintenance, and low operating costs. With advanced technology, reliable quality, and modern design, our equipment has earned high appreciation from clients worldwide.
Providing custom system configuration, documentation support, and installation engineering.
As a professional industrial solution provider, Henan Jiujie Machine Co., Ltd. delivers not only equipment but also comprehensive production solutions that enhance the overall value chain for our customers.
By utilizing AutoCAD-based engineering design systems and advanced machining centers, we are able to provide high-precision, durable products at competitive prices. We are committed to offering complete pre-sales consultation, technical support, and reliable after-sales service.
Customer satisfaction is always our top priority. We sincerely welcome partners and friends from all over the world to contact us and cooperate for mutual success.
Addressing the technical, operational, and procurement queries of global buyers and mill managers.
The Throat Pass System functions as the key structural transition zone that connects the feeding machinery (such as rotary airlock valves or gravity flow gates) to the main conveying pipelines. Its main purpose is to introduce dry powders or grain materials smoothly into the gas stream while minimizing pressure loss, backflow, and excessive material attrition.
CE Certification guarantees that the design conforms to essential European standards, particularly relating to machinery safety (EN ISO 12100) and electrical/pressure system integrity. For throat systems handling explosive organic dusts (like flour, starch, or grains), CE alignment ensures the housing can withstand defined pressure surges, helping prevent flame propagation through the plant.
Our processing lines utilize specialized mechanical aspiration, destoning separators, and dry winnowing screens instead of water washers. This helps eliminate wastewater pollution while maintaining highly sanitized grain surfaces, which reduces the potential for mold growth during silo storage.
Yes. By upgrading the contact materials from standard carbon steel to high-density wear-resistant alloys or chromium liners, the system is well-suited for abrasive mineral powders, cement, and industrial fly ash conveying applications.
High-efficiency cleaning, separation, and quality control systems for processing facilities.
Jiujie Machine
