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Loading Bellow

Bulk material loading bellows are critical components used in the controlled outloading of powdered and granular bulk solids across various industrial operations. These systems are designed to ensure safe, dust-free transfer of bulk solids into trucks, tankers, ships, and stockpiles, maintaining environmental safety and workplace cleanliness. Drawing on years of experience in bulk handling solutions, Polimak provides a comprehensive range of loading solutions tailored to meet the specific needs of each application, ensuring efficient and reliable material flow throughout the loading process.
There are several ways of integrating loading bellows into a bulk material handling system. Loading bellows are generally mounted under silos or hoppers or installed at the end of conveyors such as screw feeders, elevators, or pneumatic conveying systems. Bulk materials flowing from the upper side are efficiently transferred to the downstream vehicle, ship, or stockpile without any dust emission or product loss.

How Do Loading Bellows Work ?

• The main function of a loading bellow system is to transfer powdered or granular bulk materials vertically using gravity, ensuring efficient and controlled discharge.

• Dust generated during the loading process is contained within the enclosed column, maintaining a clean and safe environment.

• The flexible structure of the bellows adjusts to the varying distance between the discharge point and the loading area, such as trucks, tanks, or stockpiles.

• A mechanical winch system allows the bellows to extend or retract as needed, preserving a sealed flow path and enabling high-capacity loading.

 Depending on application requirements, the system can include abrasion-resistant cones, integrated dust collectors, and specialized bellow designs for enhanced performance. Abrasion-resistant cones help protect the inner surface of the bellows from wear caused by fast-flowing or abrasive materials, while integrated dust collectors capture airborne particles during loading to ensure a cleaner and safer working environment.

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Bulk Materials Handled by Loading Bellows

Starch
   
Minerals
  
Coffee Powder
Spices
  
Limestone
  
Copper Oxide
Cement
  
Salt
  
Sugar
  
Sand
  
Calcium Carbonate
Alumina
  

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Advantages & Key Benefits of Loading Bellows

• Dust-Free Loading: The system ensures that bulk materials are loaded without releasing dust into the environment, maintaining cleanliness throughout the process.

• Clean Working Environment: Loading bellows prevent dust pollution, helping to protect both plant personnel and the surrounding environment while supporting safety and regulatory compliance.

• Versatile Application: Loading bellows are compatible with a variety of bulk solids conveying and storage systems, making them adaptable to many industrial configurations.

• Multiple Loading Sources: They can be used to load materials from different equipment such as silos, hoppers, screw feeders, and conveyors, offering operational flexibility.

• Wide Range of Models: An extensive selection of bellows models and configurations is available to suit diverse material types, capacities, and application requirements.

• Automatic Retraction: Equipped with an auto-raise feature, the loading bellow retracts automatically once loading is complete, saving operator time and effort.

• No Spillage or Waste: The enclosed design ensures that materials are transferred cleanly without spillage, minimizing product loss and maintaining efficiency.

• High-Temperature Handling: We can produce models capable of handling materials with temperatures up to 300°C, extending their application in processes involving heated bulk solids..

• Food-Grade Options: Food-grade loading bellows are also available, made with materials and designs that meet strict hygiene and safety standards for the food industry.

• Simple Operation: The system is user-friendly, allowing operators to manage loading easily without complicated procedures or extensive training.

• Easy Maintenance: Designed for durability and accessibility, loading bellows require minimal maintenance, reducing downtime and operational costs.
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Bellow Types and Configurations Polimak offers a wide range of loading bellows configurations tailored to meet specific process requirements and the unique physical properties of bulk materials. Selecting the appropriate configuration is essential to ensure efficient material transfer, minimize product loss, and maintain a dust-free working environment. We design and manufacture not only single and […]

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Loading Bellow Accessories and Options Polimak’s dry bulk loading bellows come with an extensive range of optional accessories and components designed to meet diverse operational requirements. These options allow for customization and enhanced performance, ensuring that the loading system can be tailored to specific process needs and environmental conditions. Dust Collector Effective dust collection is […]

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Loading Bellow Bulk Solid Feeding Equipment Polimak provides integrated solutions where loading bellows are combined with various types of bulk solid feeding equipment to ensure efficient and controlled material flow. Depending on the specific process and material characteristics, equipment such as screw conveyors, rotary valves, pneumatic conveying systems, or airslide conveyors can be used. This […]

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Loading Bellow Models Closed Vehicle Loading Bellows • Application Areas:Closed vehicle loading bellows are used for loading tanker trucks, barges, and ships. Equipped with sealed containers, they ensure a safe and dust-free filling process.• Sealed Discharge Design:Polyurethane-coated discharge cones are used to tightly seal the vessel inlet, effectively eliminating dust escape during the loading process.• […]

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Explore how Polimak's custom-designed bulk material handling systems offer seamless storage, transport, and processing solutions. With over 40 years of industry experience, our focus on R&D and safety ensures that you meet your toughest challenges efficiently.
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Our Engineering, Your Success… DISCOVER OUR PRODUCTS OUR PRODUCTS Explore our wide range of versatile bulk material handling machinery. Explore our wide range of versatile bulk material handling machinery. View all Rotary Valve A rotary valve, also known as an airlock feeder or airlock valve, is a piece of bulk material handling equipment used to […]

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OVER 40 YEARS OF SERVICE About Us Polimak is a leading engineering and fabrication company, specializing in bulk solids handling technologies for over four decades. Our wide range of versatile bulk material handling machinery is appropriate for value-added logistics as well as handling powders, granules and pellets in the food, chemical, plastics, minerals, and agriculture […]

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SHAPE THE FUTURE Career We are an internationally and rapidly growing dry bulk solids handling equipment and systems supplier which reckons that one of the key elements to success is acquiring a passionate, talented and diverse workforce. At Polimak, we work hard to establish an environment for our employees that delivers thought-provoking objectives, thus fostering […]

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Products Explore Our Wide Range of Versatile Products At Polimak, we offer a diverse selection of cutting-edge bulk solids handling machinery. Our products are designed to meet the unique needs of various industries, including food, chemical, plastics, minerals, and agriculture processing. From efficient logistics solutions to heavy-duty industrial applications, our exceptional range of products ensures […]

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These valves are typically actuated by pneumatic actuators and are used to automatically open and close the product flow to discharge material to downstream equipment.
Installed below silos or hoppers, these valves are used for maintenance operations of equipment such as rotary valves, screw feeders, etc., that are positioned below the butterfly valve.
These valves are typically actuated by pneumatic actuators and are used to automatically open and close the product flow to discharge material to downstream equipment.
In this design, the butterfly valve is sandwiched between two flanges. Rubber sealing at both faces of the valve provides a tight seal between the flanges and the wafer butterfly valve.
One side of the valve has a bolted flange connection, while the other side features a built-in short pipe designed for fixing a flexible sleeve.
These valves have bolted flange connections on both sides, making them suitable for installation on silos, hoppers, screw feeders, and similar applications.
Bulk tanker trucks or open trucks can be filled with powdered materials delivered within FIBC bags. These systems generally consist of bulk bag discharging station, mechanical or pneumatic conveyor and loading bellow. Big bag discharge station transfers the bulk solid from big bag to conveying system. Conveying system transfers it to truck loading area. And loading bellow is used to fill tanker truck without any dust emission. Since truck loading operations are done within limited time, high capacity big bag discharge systems and bulk material conveying systems are used. For short distances, screw conveyors are preferred to transfer material from big bag discharge station to truck loading chute. For long conveying distances, pneumatic conveying systems provide better service. There may exist a storage hopper or silo above bulk truck loading bellow to compensate material flow between inlet and outlet. Bulk bag discharge and truck filling systems have automatic control system that monitors product level in truck and operates all equipment accordingly. Optional weighing system can be added to measure the amount of material that is filled to truck.
Big bag discharge systems can deliver dry bulk solids in powder and granular form to weighing and batching systems. The loading hopper of the weighing system should remain full during dosing and batching. Big bag discharge systems can monitor the product level in the loading hopper and maintain a constant level automatically. Depending on the dosing speed and conveying distance, mechanical conveying systems or pneumatic loading systems may be used. Dust collectors can be employed to prevent dust emissions during hopper loading, especially for materials with high dust content.
Dry bulk packaging systems are used to fill powdered or granular materials into bags, drums, jars, sacks, etc. Bulk materials delivered in big bags must be transferred to packaging machines without interruption. The loading hopper of the packaging system should remain full during the filling and packaging process. Big bag discharge systems can monitor the product level in the loading hopper and maintain a constant level automatically. Depending on the packaging speed, mechanical conveying systems or pneumatic loading systems can be selected. Dust collectors can be used to prevent dust emissions during hopper loading, especially for materials with high dust content.
Mixer automation systems are used to mix dry bulk solids according to specific recipes. Raw materials delivered in FIBC bags can be transferred to mixing units through a combination of conveying equipment and bulk bag discharge systems. Depending on the type of application, pneumatic conveying or mechanical feeding systems can be used to fill mixers. Big bag discharge stations can be manufactured with built-in dosing systems. The amount of raw material to be loaded into the mixer is automatically controlled with the help of a weighing and dosing system. Dust collectors can be used to prevent dust emissions during the mixer filling process.
Bulk material stored in big bags can be automatically filled into small bags. Big bag discharge systems come with optional built-in bag filling units. For low filling capacities, these units are installed below the big bag discharge hopper, providing a practical and cost-effective solution. Both big bag discharging and bag filling operations can be handled by a single, compact system. For higher bag filling needs, bag filling machines are installed near the bulk bag discharge stations. Pneumatic conveying systems or mechanical conveyors can be used to transfer bulk material from the FIBC bag discharge station to the bag or sack filling system.
Mechanical conveyors can be used for silo loading from big bag discharge stations. Screw feeders, bucket elevators, rotary valves, or chain conveyors are connected to big bag discharge stations to fill silos. The selection of conveying equipment directly depends on the conveying distance, height, transferred material, and capacity. Bucket elevators are preferred for high silos, while screw feeders are preferred for shorter silos and short distances. The big bag discharge system can be installed on top of the silo for faster filling. In this case, rotary valves or butterfly valves are better choices as they provide simple flow control. Dust collection systems may be required depending on the dust content of the bulk solid. During silo loading, air content in the silo escapes to the atmosphere and carries some dust along with it. Vacuum fans and jet filters in dust collectors prevent dust emissions into the environment. The collected dust is sent back to the silo, thus preventing product loss.
Pneumatic conveying systems installed after bulk bag discharge units transfer bulk material through conveying pipelines to fill silos. This configuration is useful in applications where high transfer rates and long conveying distances are needed. In production lines where raw materials are stored in warehouses far from storage silos, bulk bag discharge stations can be installed close to the warehouses, and pneumatic conveying systems are used to fill silos from long distances. This design reduces the need for forklifts and cranes for bulk material transfer on the production site and increases overall efficiency.

Pneumatic conveying systems used for silo loading utilize blower pumps or compressors. Motor power, pipeline diameter, and equipment selection depend on the type of bulk material, transfer distance, silo height, and transfer capacity. Level sensors, jet filters, and other equipment are installed on storage silos to ensure the proper operation of the silo filling system.
Pneumatic conveying systems installed after bag dump units transfer bulk material through pipelines to fill silos. This configuration is ideal for applications requiring high transfer rates and long conveying distances. In production lines where raw materials are stored in warehouses far from storage silos, bag dump stations can be installed close to warehouses, allowing pneumatic conveying systems to transport materials over long distances. This design reduces the excessive use of forklifts and cranes for bulk material transfer within the production site, improving overall efficiency.

Pneumatic transfer systems used for silo loading utilize blower pumps or compressors. Motor power, pipeline diameter, and equipment selection depend on factors such as the type of bulk material, transfer distance, silo height, and transfer capacity. Level sensors, jet filters, and other equipment are installed on storage silos to ensure the proper operation of the silo filling system.
Mechanical conveyors can be used for silo loading from bag dump stations. In this configuration, screw feeders, bucket elevators, rotary valves, or chain conveyors are connected to bag dump stations to fill silos. The selection of conveying equipment depends on factors such as conveying distance, height, material properties, and capacity. Bucket elevators are preferred for high silos, while screw feeders are ideal for shorter silos and short distances. Bag dump systems can be installed on top of the silo for faster filling. In such cases, rotary valves or butterfly valves are better choices as they provide simple flow control.

Dust collection systems may be required depending on the dust content of the bulk solid. During silo loading, air inside the silo escapes to the atmosphere, carrying dust particles with it. Dust collectors equipped with a vacuum fan and jet filter capture airborne dust. The collected dust is returned to the silo, preventing product loss and ensuring a cleaner environment.
The inlet skirt is an optional feature designed to extend the lifespan of the flexible connector sleeve. Its upper portion is attached to the outlet port of the upstream equipment and extends down into the bin activator’s inlet port. The primary function of the inlet skirt is to serve as a protective shield, safeguarding the flexible connector seal from wear and damage.
A vibratory motor is externally mounted to the bin activator. When powered, the motor generates vibrations that facilitate a steady flow of dry bulk materials within the system. Depending on the application requirements, one or two vibratory motors can be installed externally.
To accommodate a bin activator, the cone of a silo must be shorter than usual, resulting in a wider outlet. A flange supplied with the bin activator is separately welded to the silo’s outlet, slightly above the opening, at the production site. Once installed, the vibrating bin discharger is securely bolted to the flange, ensuring a stable and reliable connection.
Special spring suspension links and an engineered polymer seal work together to create a flexible connection between a vibrating bin discharger and the equipment positioned above it.

The proper design and installation of the polyurethane seal prevent it from slipping off and ensure a secure seal, eliminating the risk of dry bulk material leakage. Additionally, the seal offers high stress resistance and long-term durability, withstanding stresses caused by motor vibrations, pressure conditions, and other operational factors.

Externally installed spring suspensions provide full resilience to the vibrations of the cone head. They ensure that the generated vibrations affect only the cone itself rather than the upstream equipment structure.
An internally tapered, conical-shaped baffle plate is positioned at the center of the bin activator’s diameter. The baffle is rigidly attached to the equipment body using structural steel components. It facilitates bulk material flow from upstream equipment by directly inducing vibrations into the material.

A secondary deflector plate reduces the weight of the bulk material in the lower portion of the bin activator by acting as a wedge beneath the material, directing it around the areas adjacent to the cone’s surface.

Polimak baffle plates are available in various configurations, including convex and cone plates, and in different angles (15°, 30°, 45°, or even 60°) depending on the flow characteristics of the handled bulk material and the specific application requirements.