Screw conveyors are a type of machine that helps to transport solids, slurry, and liquids. They can be used for a variety of applications from transporting material in mining operations to moving products at manufacturing plants.
Let's dive into the details on how screw conveyors work, the different types available, and things you need to know before purchasing one. It is important that you understand this information so that your purchase will meet your needs without any added stress or problems.
What is a screw conveyor?
A screw conveyor is a machine that moves and transports items along cylindrical troughs. The shape of the indents in these troughs causes the material to be pushed forward as it rotates on its axis, so they can transport heavy objects without causing damage or blocking up behind them.
This method can be used for various purposes, such as transporting and processing different types of materials or providing support to other machines like the crusher in most mills.
How do screw conveyors work?
A screw conveyor works using small blades called "screw flights" which rotate on both ends at an angle parallel with its axis while being pushed along by the rotation action from two perpendicular shafts (usually electric motors).
When this motion occurs, it forces particles against each other because they are moving sideways as well as up and down relative to their position within these many little spaces created between them when passing through either one blade's slot next door or any space left behind after another has passed through.
What types of materials can screw conveyors handle?
If you're looking for a conveyor that can handle different widths, lengths, and weight capacity then the screw type may be what's best for your business. This is because they are capable of handling all kinds of material by using coils on chains or belts as opposed to metal rollers which only work well with specific materials such as aluminum plates.
What are the different types of screw conveyors?
Did you know? Screw conveyors don't just move heavy objects like coal and flour - they can also be used to transport fine powders or granules of material.
They are a type of gravity-powered device that continuously rotates around its axis, typically using helical blades in the screw threading for carrying substances up from one level to another.
Here's a list of some of the types of most commonly used screw conveyors:
Horizontal screw conveyor
A horizontal screw conveyor is the most distributed version of a screw conveyor because of its simple and easy-to-use design. These conveyors can transport materials at 15-45% through loading, which means that up to 45% more material may be transported than what could have been on other types of designs in the past due to how much easier it was made for operators.
A higher load will result from transporting lighter free-flowing bulk while a lower load would come from heavier viscous sluggish material inclined screw conveyor
Inclined screw conveyor
An inclined screw conveyor is basically the same as an auger but used at an incline between 0° and 45° from horizontal. However, they perform differently, as each degree of incline reduces the efficiency of the conveyor and the amount of material that flows through it.
As more torque is required to pull material through the conveyor, it must be more closely designed for the conveyed product as more torque is required to pull material through it. This means that the angle of incline should be as low as possible to maximize efficiency and reduce the need for additional power.
Shaftless screw conveyor
A shaftless screw conveyor is an improvement to the typical design, as it allows the material to flow "through" the auger rather than only around. This design provides a huge difference in practice for these types of systems: they are inherently non-clogging and can transport materials not typically handled by screw conveyors such as high-moisture or non-flowing products.
The shaftless screw conveyor is an advancement that improves the efficiency and range of products it can transport.
Vertical screw conveyor
A vertical screw conveyor is capable of transporting large volumes and it takes up a small footprint. This type of conveyor works best with bulk products that are dry or semi-fluid because they can handle rough terrain like an incline.
The method of feeding vertical conveyors depends heavily on the product being transported; for example, light material cannot be fed using a gravity hopper alone. For this reason, engineers have designed auger blades that act like fans and keep such materials in place.
Screw conveyor capacity
When transporting substances from one location to the other, a conveyor belt is most often used.
One of the considerations for selecting an appropriate type and size of screw conveyors involves calculating how many cubic feet per hour are needed in order to be conveyed; this can be done by finding out what desired volume needs to go through each square foot on average every minute or second depending on if it's being calculated over seconds or minutes respectively then multiplying that number by 60 (seconds) / 3600(minutes).
Using these calculations with various inputs such as recommended trough loading percentage for your particular application, screws diameter along with their pitch will allow you to find exact capacities given maximums which vary based upon factors like material transported.
Screw design & drive
There are many types of screw designs, each with its own advantages. For example, the paddled screws help to mix materials more thoroughly while short pitch screws can be used for incline conveyor systems in order to maintain efficiency.
Determine what type of design you need by considering your desired function and then choose an available option including screw design- it matters how much horsepower is needed on a drive motor when choosing this option
Selecting the right drive for the desired screw shape will help guarantee it works as intended.
Load type, trough load, and trough design
What material will be passing through the conveyor?
When choosing the best conveyor type for your materials, it's important to consider what these materials are. If you have light or dry material such as sand and gravel that is hazardous, then a high dust protection trough would be ideal.
Similarly, if your product has inherent non-flowing properties like pellets or disks - a low shaftless screw design will work best because of its lower capacity requirements.
When considering which trough shape aligns with desired flow rate for these types of products the diameter and length can vary greatly; but in general flatter, designs require more power than taller ones do since their drag force impairs performance as height increases (this varies depending on the machine).
Behavior, control, and environment
Finally, consider any external factors and unique behavior of the screw conveyor in your application.
- How much distance must be covered?
- Will the distance be increasing/decreasing in elevation, and will the material need to be separated from operators/the atmosphere?
- Will the conveyor operate at a set speed, or will a variable speed drive be used to change the speed?
- Will the conveyor be part of a larger control system, and will sensors need to be embedded to ensure accuracy?
Answering these four questions will allow you to narrow down which products would be a good fit for whatever it is that needs moving around.
Are you looking for a screw conveyor?
If you're looking for a screw conveyor, we have the perfect options for you!
Rotating Solutions is full-service manufacture and supplier of bulk handling conveyor systems and parts. We offer many features and benefits to assure the highest level of safety and quality.
With our state-of-the-art fabrication facility and highly experienced design team, RSI can customize conveyor systems specifically for your application.
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