Vibratory Feeder Working Principle

A vibratory feeder is a device used to move product from one area of the production line to another or from one process to the next using vibration. Product movement is created by cleverly orientating the drives so that the vibration causes the product to hop along the feeder tray many times a second.

Vibrating feeders are used as they give an even flow of product which is required for many processes such as separating and packaging operations.

A vibratory feeder is a device used to move product from one area of the production line to another or from one process to the next using vibration. Product movement is created by cleverly orientating the drives so that the vibration causes the product to hop along the feeder tray many times a second.

Vibrating feeders are used as they give an even flow of product which is required for many processes such as separating and packaging operations.

Product moves along a solid tray, so maintenance and cleaning are much easier as there are no joins or mechanisms in which product may become trapped, meaning less downtime to production processes. This also means product is less likely to become damaged. There are two common means of achieving the vibrating principle of a feeder:

Electromagnetic:

Typical vibratory feeders use an electromagnetic drive to create a high frequency, low amplitude vibration.

The feeder is made up of a tray (or pan) suspended above a base using leaf springs. Attached to the tray is a magnet, and attached to the base is an electromagnetic coil. When the coil is activated the magnet and tray assembly is attracted to the coil, when the coil deactivates the magnet and tray are released allowing the magnet and tray to spring forward using the tension in the leaf springs. If the springs are angled correctly this will make any product in the tray hop forward. As the coil is re-activated the cycle repeats. The overall effect is the appearance of a smooth flow of product from one end of the tray to the other.

Electromagnetic Vibratory Feeder parts 

 

Vibrating feeder working principle1.  Pan – the pan is commonly referred to as the tray on linear feeders. It is the vehicle for products or materials to move from one area of the production line to another. Standard size pans are available or are custom designed based on the application. 

2. Heavy duty base – the base of the feeder contains the coil, core and armature assembly.

3. Composite leaf springs – leaf springs are attached to the base and pan, serving two purposes; they act as support for the feeder and control the vibration. Too much vibration will cause the feeder to be unstable and conveying can be compromised. The composite leaf spring structure bends and flexes to capture and control the vibration.

4. Controls – the air gap between the coil and springs needs to be carefully controlled. Too much of a gap will cause too movement, and not enough can cause the coil to make contact with the springs and cause damage.

5. Rubber feet – floor-based feeders either contain rubber feet and can be bolted to the ground so that the machine stays in place. The rubber feet dampen down the vibration to ensure the machine’s stability.

Out-of-Balance Motor:

Out-of-balance motors are commonly used in more heavy-duty feeder applications, as they can apply greater forces than electromagnetic drives.

Feeders with out-of-balance motors create movement in the product in a similar way to electromagnetic drives, but operate at lower frequencies, and greater amplitudes.

The weights are off-set and act as a counter balance to the mass of the feeder tray. As the motors rotate, the centrifugal forces move the tray backwards and forwards opposite to the direction of the motors (as the weights in the motors go backwards, the trough goes forwards) and proportionally to their relative masses (if the trough is 10 times the mass of the weights in the motors, it moves 1/10 the distance). The amplitude of vibration can be controlled by amending the position of the weights within each motor. To isolate the vibration of the feeder from the supporting structure, the tray is suspended on coil springs of specially design rubber suspension units.

 

View Gough’s range of vibratory feeders here