RU1790342C - Log grip for branch cutting plant - Google Patents

Abstract

Usage: in gripping mechanisms, mainly used in mobile plants for cutting branches from tree trunks. SUMMARY OF THE INVENTION: The gripper comprises a support element and a gripper arm pivoting around a horizontal axis, provided with a power drive as well as a V-shaped abutment for a tree trunk. New to capture is that. that on the shelves of the stop there are made strips with pointed edges located at an angle to each other with the formation of a conical groove between them. 3 ill.

Description

FIELD OF THE INVENTION This invention relates to grippers used primarily on forestry machines to hold a tree trunk when cutting branches from it.

A grip for a tree trunk is known in knot trimming installations, comprising a support member and a gripping arm pivoted around a horizontal axis and provided with a power actuator, as well as an abutment consisting of two vertical plates having an inclined support surface.

A disadvantage of the known capture is the unreliability of fixing the tree trunk when trimming branches from it and holding it in the longitudinal direction.

It is an object of the invention to provide reliable retention of a tree trunk in the longitudinal direction.

For this purpose, in the well-known grip for a tree trunk, comprising a supporting element and a gripping arm pivoted around a horizontal axis, provided with a power drive, as well as a V-shaped stop for the tree trunk, the punches with pointed edges are made on the support flanges of the V-shaped stop. and located at an angle to each other with the formation of a conical groove between them.

Comparative analysis with the prototype shows that the claimed grip is distinguished by the presence on the supporting flanges of the V-shaped abutment of planks with pointed edges and located at an angle to each other with the formation of a conical groove between them.

In FIG. 1 shows a grip for a tree trunk in a tree cutting plant, side view: FIG. 2 is a view A in FIG. 1: in FIG. 3 is a section BB in FIG. 2.

The gripper contains a carrier element 1. in this particular case, the guide beam of the delimbing unit and mounted on it by means of an arm 2 rotatable around the horizontal axis of the lever 4. equipped with a power drive made in the form of a hydraulic cylinder 5. A V-shaped stop is fixed to the bracket 2 of the carrier element with supporting shelves 6. On the indicated shelves of the stop there are made strips 7 with pointed edges a. and located at an angle a to each other about

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the formation of a conical groove between them. The angle a is selected between 45-90 °.

Capture works as follows.

The tree trunk 8 to be treated by any known method, for example, by the manipulator of a tree cutting plant, is brought forward by the butt into the gripping range, the lever 4 of which is in the open position. Then, the hydraulic cylinder 5, the gripping lever 4 presses the tree trunk against the supporting shelves 6 of the V-shaped stop. After clamping by the gripper of the butt of the tree trunk, branches are cut from it by dragging the delimbing head (delimbed knives) by any known method along the fixed tree trunk in the direction from its butt to the top (arrow B).

When the delimbing head is moved along the trunk, due to the resistance exerted by the delimbing knives being cut off by the delimbing knives, forces directed along its longitudinal axis act on the tree trunk. Poi cutting branches with

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the fine wood effort exerted by the hydraulic cylinder is sufficient to hold the barrel with a gripping arm. When processing wood with sufficiently large knots, due to the increased resistance force acting on the knot-like knives (delimbing head) moved along the tree trunk, the tree trunk begins to shift somewhat relative to the gripping lever and stop in the direction of movement of the delimbing head. In this case, the barrel, interacting with the pointed edges f of the strips 7, is pulled into a conical groove between them. The greater the resistance to movement of the delimbing knives, the greater the pulling force of the tree trunk into the cone-shaped groove between the support flanges.

Thus, the claimed technical solution allows, without increasing the power of the power gripping lever, to ensure reliable retention of the tree trunk in the longitudinal direction during the cutting of branches from it.

Claims (1)

SUMMARY OF THE INVENTION A grip for a tree trunk in a tree trimming unit comprising a support member and a gripping ring rotatable about a horizontal axis. equipped with a power drive, as well as a V-shaped emphasis for a tree trunk, characterized in that, in order to ensure reliable retention of the tree trunk in the longitudinal direction, planks are made on the supporting shelves of the V-shaped stop with pointed edges and located at an angle to each other with the formation of a conical groove between them. Editor T. Kurkova Compiled by V. Shuml ev Techred M. Morgenthal Fig.Z Proofreader V. Petrash