Screw conveyors are bulk material transportation systems composed of a rotating, spiral screw inside tubular casing or a trough. As the screw rotates, dry or semi-dry bulk material is pushed forward through the conveyor from one area to another.
Screw conveyor systems, also called auger conveyors, helix conveyors, worm conveyors and flexible screw conveyors, handle all kinds of different substances, including powder, sludge, dust, flakes, granules and other loose products like seeds, food waste, wood chips, cereal, grain, boiler ash, fuels, feed and cement. In addition to transporting materials down a linear plane, industrial screw conveyors also aide in the mixing, agitation or breakdown of some substances due to their rotating motion with the screw's paddles. While most are made out of metals like aluminum and steel, some plastic screw conveyors are used in high heat, sanitary and high impact applications. The screw and bulk materials that are being conveyed are held in a trough or wholly incased. Tubular screw conveyors completely cover the screw, ensuring that no material will be lost in transit. Whether they are stationary and permanent or portable screw conveyors, these bulk handling systems are positioned at a number of orientations. Standard conveyors are horizontal, while some vertical screw conveyors lift material straight up and down. Inclined screw conveyors are positioned at an angle and are considered flexible conveyors if they can alter or bend in some way.
While industrial screw conveyors are used mostly in bulk handling applications, they are popular in agriculture as components of farm machinery like threshers or balers. They also transport animal feed, grains and seeds to different locations. The food processing industry also uses industrial screw conveyors to transport dry ingredients like salt, flour, nuts and any other raw material used to produce food products. These conveyors are always made from food grade stainless steel, which exhibits a smooth surface and is non-contaminating. They are also popular within the construction industry when mixing dry and wet materials to form cement or plaster. In some situations, screw conveyors will even outperform more standard types of conveyor systems. Because the screw will cut through materials during operation, sticky substances like gels, materials that do not breakdown easily or those materials not intended to be broken down are not ideal for screw conveyor systems to process. Rather, they are used mostly to transport dry to semi-dry bulk materials, both free-flowing and non-free-flowing.
Screw conveyors have three different orientations: horizontal, vertical and inclined. Horizontal screw conveyors transport the material in a linear direction and require only a trough. Vertical conveyors carry material straight up and down and require a tubular casing to hold all the material inside. They are needed when material must be transported from a receptacle low to the ground to one that is very tall. Compared to bucket elevators, vertical screw conveyors are lower maintenance and provide continuous conveying. Finally, many applications require the use of inclined conveyors, which are set at an angle. They require ample space and an increased amount of power to lift the material, but their slant economically transports bulk material between facility floors. Some are portable and mounted on stands, carts or vehicles and may be moved around a facility. Flexible screw conveyors are able to adjust their angle and may bend in different directions, creating a wider range of uses within a single facility. Most conveyors, however, are manufactured out of steel and are therefore unable to move.
These conveyors transport loose, dry materials to and from vats, hoppers, silos, rail cars, barrels, trucks and pits. They can be powered by an electric motor, although some harness the energy from nearby machinery like a trailer's power take-off shaft. Standard industrial screw conveyors are usually constructed with metal. However, some that are used in the food industry are made out of thermoplastic resin that has been injection molded and can withstand high impact and temperature without contaminating the products they carry. The selection of screw conveyors depends upon the industrial application, material and material consistency as well as additional operations required of the screw conveyors system. Screw conveyors fabricated by screw conveyor manufacturers are found in numerous industrial applications in the agricultural, food and beverage processing, plastic, pharmaceutical, chemical, mining, oil and gas and construction industries. Because of their gentle handling and blending, screw conveyors can be used to transport a wide variety of materials in many different industries. Some examples of these products include carbon black, caffeine powder, gypsum, ferric sulfate, cocoa beans, flour, garlic powder, Epsom salts, vitamins, fiberglass, whey, lead oxide and many other materials.
Screw Conveyors - VAC-U-MAX
Screw Conveyors - VAC-U-MAX
Screw Conveyors - Conveyor Engineering & Mfg. Co.
Screw Conveyors - VAC-U-MAX
Screw Conveyors - VAC-U-MAX
Screw Conveyors - Conveyor Engineering & Mfg. Co.
Screw conveyor systems are a mechanism that are responsible for rotating or moving fluids and a variety of granulated materials to the next process in a large mechanism. They have a rotating screw blade, of which the speed can be controlled. These systems are generally used in a tube; however, they can be installed elsewhere, such as exhaust drain. These systems are used for moving materials like food waste, process fluid, wastewater, wood chips, animal feeds, boiler ash, meat, etc. They are used in the agriculture, mining, food processing, construction, and manufacturing sectors.
Typically, modern conveyors are installed horizontally in tubes and pipes. However, sometimes, they can be seen having a slight inclination. There are vertical screw conveyors as well; they are involved in some special industrial processes, requiring a straight up or down movement of materials. For that reason, they are also referred to as screw elevators.
How Screw Conveyors Work?
The ancient mathematician and scientist Archimedes devised the first screw conveyor; it was known as Archimedes' screw. He theorized the screw principle. According to his theory, a revolving screw or auger that is correctly fitted into a cylinder or tube can move water in the desired direction. Every rotation apart from forwarding the water or granules to the next process, also allows the new material to enter the tube. Almost all screw conveyors of modern generation work on the same principle.
Types of Screw Conveyor
Based on the mechanism and placement in a tubing or cylinder, screw conveyors are available in six types -
Vertical Screw Conveyor: Typically, these are used for handling bulky materials in manufacturing and agriculture industries. They are considered the best for the facilities that do not have sufficient space to install horizontal conveyors. Additionally, they can efficiently handle heavy and large size loads.
Horizontal Screw Conveyor: Quite similar to vertical conveyors, horizontal screw conveyors offer assistance to chemical plants in managing their fluids and gases. In addition, these mechanisms are also used in heating, cooling, mixing, dewatering, drying, aeration, and compaction processes. With horizontal conveyors, a number of manufacturing businesses break and compact uneven materials.
Screw Feeder Conveyors: Screw feeders are a sub-type of horizontal screw conveyor. They are designed to perform at their full capacity, while a common horizontal conveyor does forty to fifty percent. These advancements are used for efficient and constant conveying of materials from one process to another. Due to this very specification, they are used feeder for controlled in feeding of materials in many industrial processes.
Flexible Screw Conveyor: Flexible screw conveyors have a flexible or bendable casing. This casing is close-fitted in the cylinder.
Sand Screw Conveyor: Sand screw conveyor is an ideal mechanism dewater sand or granules. Besides, this device can also be used for removing fine particles from the material.
Grain Screw Conveyor: Grain screw conveyors are a tool for the agriculture industry. It is often called agricultural screw elevator and is used for lifting and loading the material into a truck.
To define in simple terms, a screw conveyor is a system that has a screw for the transfer of materials. Also known as a helix conveyor, spiral conveyor, and auger conveyor, the screw conveyor has a screw made of spring steel or stainless steel. Sometimes, this flexible screw is fitted into a plastic tube. Sometimes, the tube can be made of steel or another material.
The key purpose industries use screw conveyors for is to reduce maintenance and production costs. To meet that goal, it is essential to make sure that the screw conveyor system is working perfectly and is giving its best performance. The below subsections discuss certain ways that will help you get the best output from screw conveyor systems -
In addition to these, you can also add access and inspection ports near the outlet. These access points will allow you to ensure reliable performance of your conveyor.
Screw conveyor is a device that has a rotating helical screw blade that moves liquid or granular materials in an industrial or mechanical process. The blade is called a flighting or flight that is fitted with a screw inside a tube. Typically, screw conveyors are used for handling bulky materials, fluids, and granules. They are usually positioned horizontally, however, vertical screw conveyors and inclined screw conveyors are also available at some conveyor manufacturers.
Screw conveyors offer a reliable and cost-effective way to move bulk materials. These versatile machines can convey a variety of materials - from dry to liquid and from small solid to semi solid.
Use of Screw Conveyors
The key job of a screw conveyor is to move liquid or semi-solid materials, such as food waste, process chemicals, wastewater, grains, granules, solid waste, and many other materials used across industries. The industries that use this device in their process are -
Screw conveyors can be used for conveying a variety of materials. For different purposes, there are different types of conveyor systems. Manufacturing businesses that work on small level often use portable screw conveyors.
What Type of Materials?
Fluid, granules, and bulky materials are conveyed by these specific industrial applications. These materials sometimes are needed to be sent from one process to another - for example, from the production area to the storage or from the storage to the packaging section.
The materials that are handled by these devices can be categorized in following order -
The type, capacity, and design of a screw conveyor are decided considering the above-mentioned characteristics of a material. The design of the device is largely dependent on the type of material and the application, for which it is being used.
The Working Principles
Screw conveyors are a device designed to process a certain volume of material per minute. With every rotation of the screw, the device forwards or conveys a certain amount of material to the next stage or process.
The rotation and speed of the movement can be controlled by the user. A specifically designed machine, screw feeders are sometimes used to feed the material into the process machine. Screw feeders are a similar device that conveys the material for the production. These machines can carry the desired amount of material to the next process at a programmable, controlled speed.
The material is conveyed in a precise flow rate that is measured in cubic feet per hour. In some bulk, industrial process machines, the capacity is measured in pounds per hour or tons per hour.
It is important for the business to have an adequate screw conveyor for smooth, flawless operation. For that, you will need to have all the information about your purpose and application requirements. You should convey your exact requirements to your supplier, so that they can provide you with the best machine.
Flexible and portable screw conveyors are a type of screw conveyors used by businesses across industries. They are basically a conveyor system that helps a manufacturing plant to move materials from one stage to the next. Conveyor systems are available in various designs and types - and, screw conveyor is one of them. In the same line, flexible screw conveyors are a kind of screw conveyor that are gaining popularity due to many of their advanced features and design-related advantages.
If you are looking for a flexible or portable screw conveyor, it can be a daunting process - as they are available in a variety of specifications, such as size, flexibility, capacity, flow rate, and material suitability.
Portable screw conveyors are typically designed for moving granules of a range of materials. They are also used for moving powered materials. The reason why these devices are labelled as flexible or portable is their design. The radius of the device allows you to set custom requirements between 45 degrees and 90 degrees angles.
The following descriptions underline some of the most convincing explanations why the adoption of these devices is rising -
Cost - Low cost of portable screw conveyors is probably the biggest reason behind the high adoption rate of these versatilities. In comparison to other types of conveyor systems, they are the least expensive choice. Mainly the cost of the machine depends on the type of tube; the length of the conveyor mechanism; the size of the motor; capacity; and other custom features. Owing to their small size and intelligent design, portable conveyors can suit numerous applications and low budget.
Material Support - As said earlier, these convenient machines are a product of intelligent product designing. They are designed to support and move thousands of materials efficiently. Using these devices, you can convey powders to mixtures and pallets to granules.
No Degradation - Material degradation is not exactly an issue with the present-day flexible conveyors. Material degradation is less expected in these advances. However, it is only true when you use the suggested material for the process. That is the reasons why you should get the machine that is suitable for your application and process.
Speed - The flow rate or speed of the device largely depends on its capacity and the amount and type of material being used. Portable SCs can be designed to support an adequate speed that is necessary for the process.
Design Features -The material of the tube can be chosen according to the material that has to be conveyed in the industrial procedure. It helps smooth the flow rate as well as ascertain the safety of the material. For example, Food Grade rubber (UHMWPE) is used for food processing and anti-static UHMWPE for moving explosive materials.
Customization - Portable screw conveyors can be designed and manufactured to the specifications of the client business. You can ask the manufacturer to add flexible discharge hose, wash down section, mobile base unit, right angle gear reducer, integral bag dump hoppers, and a few features in the control panel.
All these advantageous features have contributed to the mounted acceptance of portable screw conveyors.
The driving force of a screw conveyor, consisting of a spiral flight fused
to a metal pipe that rotates within the conveyor trough.
- The point of exit for conveyed materials.
- Conveyor screw containing two flights.
- The metal spiral ridges or threads on a screw.
- A product's direction of travel on a conveyor.
- The structure that supports the various components of the conveyor.
- Screw conveyor mechanism that aids in the correct alignment of the conveyor screws.
- Screw conveyor flight that consists of a continuous metal strip configured in a spiral shape.
- A measure of the time rate of doing work.
- The point of entry for conveyed materials.
- A barrier placed between a conveyor screw and a screw conveyor component, such as a trough, to reduce friction between the screw and trough.
- Conveyor screw in which the pitch is greater than the diameter of the screw.
- The machine on the conveyor that converts electrical energy into mechanical energy.
- Conveyor screw containing more than one ribbon flight along the length of the screw.
- Conveyor screw containing blades attached at different angles, depending on the industrial application, used for mixing, blending or similar applications.
- Distance between conveyor screw flights.
- Conveyor screws that contain sectional flighting and are used to prevent sticky conveyor materials from accumulating inside screw conveyor pipes.
- A screw conveyor flight consisting of individual bends or sections, fused together into spiral form. Sectional flighting is created by inserting a ring in a hydraulic press. It is a durable yet sometimes expensive type of flighting that is useful in tough applications, such as those in the construction and mining industries.
- The portion of the screw that provides support onto the flight to which it is fused.
- Conveyor screw in which the diameter is greater than the pitch. Short pitches are used on inclined screw conveyors with slopes measuring 20° or greater.
- The total amount of material being conveyed at any particular moment in time.
- A duct inside of which the screw is inserted and through which the materials are conveyed.
- Conveyor screws in which the pitch increases along the length of the screw.