A felling head for excavators is an attachment that is meant to be mounted either to the chassis or a boom on the base carrier. Felling heads have three primary categories and these are felling heads, bunching heads, and processing heads.
Table of Contents
Felling Head
Felling heads are grapples with bar saw perpendicularly attached to the grapple. These have the ability to cut trees and control the fall’s direction. Grapple saws are grapples with bar saw with a grapple attached parallel to it. These are often used at landing to carry out some trimming of materials.
Felling head for excavators for timber manipulation, …
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Bunching Heads
Used on feller bunchers, bunching heads have the capacity of holding several stems simultaneously while cutting. These are available in a variety of configurations and styles according to their cutting method. There are basically three cutting method styles that bunching heads use and these are shear, bar saw, and disc saw.
Video: Uniforest Felling head RK260
The head is the one holding the stems through the accumulator arms and grabbing or gathering arms. The gathering arms like standard grapples reaching out to grab the stems that are being cut. The accumulator arms, on the other hand, are hinged, allowing them to extricate themselves from the back of the stems that are already inside the accumulator to allow the newly cut stem to be added to the bunch within the accumulator.
Disc saws are large steel discs with cutting teeth connected at the edge. Disc saws are also referred to as hotsaws due to the constantly spinning saw blade. This saw is being spun at extremely high speeds of more than 1,000 rpms.
Bar saws are mainly large chainsaw bars mounted on the felling head for excavators while shears work on the same principle as the anvil-type pruning shears that gardeners use.
Processing Head
A processing head has the ability to fell trees and perform some kind of processing on the stem. Processing heads that are most common can delimb and buck stem into logs or what is sometimes called “cut to length” system.
Majority of processing heads are meant to fell and process a single stem one a time. The current focus on smaller diameter and biomass material paved way to the development of the process that can handle several steps. There is also a recently developed kind of head with the ability to not only fell the tree but also to convert the stems to chips.
Feed rollers, delimbing knives, and bar saw are the primary components of processing heads. The stem is held by the delimmbing knives while it is cut and processed. The tree is fell by the bar saw, bucking the stem to length. The stem is moved through the head for bucking and delimbing by the feed rollers. The delimbing knives feature sharp edges meant to shear limbs from bole as the stem gets fed by the feed rollers through the head.
Now that you know the primary categories of felling head for excavators, you will be able to choose the one that best suits your task at hand.
