CS242248B1 - Tractor arm for approaching wood - Google Patents

Abstract

The tractor arm is designed for pulling wood from the stand and bringing it closer along the line to the intended location. It consists of a basic arm (2) and a slidingly inserted extendable arm (3), which has guide rollers (5) and a hanging grab (8) mounted on its free end. A tractor equipped with such an arm is capable of not only pulling wood from the stand by means of a winch with drums (7) located on the sides of the arm, but also a) using its own power to transport individual pieces of wood or a whole bundle of logs in a grab (8) to the removal location. The purpose of the invention is to simplify the process of transporting wood in the phase of pulling it out of the stand and bringing it closer along the line to the removal location, to reduce the physical effort of the operator, to reduce damage to the stand and to increase the efficiency of work in forestry.

Description

The invention solves a tractor arm designed for hauling and skidding timber by a tractor from pre-crops in forestry.

So far, the technical means used to serve this purpose, from which one of the stand timber is pulled out by a winch on the hump and the other is then pulled by the individual pieces or bundles to a picking point. Rope winches need to be pulled through pulleys mounted on trees to stand and their location must change from time to time. The combination of mechanisms, double clamping or transhipment and the necessary changes in pulley positioning and winch lead to significant financial losses in addition to increased operator effort and increased crop damage.

The essence of a tractor arm for approaching wood, especially. In the case of the forearms, a base arm is attached to the tractor frame, in which the sliding arm is slidably mounted on the free end with directional rollers guiding the ropes of the winch drums fixed on the sides of the base arm in the tractor frame or directly on the base of the arm and suspension grab. wherein the two arms are connected to each other by a linear double-acting hydraulic motor and as a whole swingable in a vertical plane running along the longitudinal axis of the tractor.

The tractor arm of the invention has the advantage that, in addition to the directional guidance of the rope from an adjustable height to the stand, it allows grabbing the rope of approached wood into the grab and its direct transport to the derived location. Thus, there is no need to use another mechanism for the removal of the winch pulled from the stand and the anchoring of the pulleys and the winch itself, which in connection with the reel adjustment is very time and physically demanding. The telescopic tractor boom allows you to overcome the critical off-road situation, whether by changing the center of gravity of the tractor by swinging the boom or sliding away from the load or off-road with the power of a straight-line double-acting hydraulic pull-out engine. limited by adherence. A variety of forestry adapters can be hung on the boom, and the arm as a whole can be mounted on any type of tractor suitable for the desired job.

In the accompanying drawing, there is shown a tractor frame according to the invention mounted in a tractor frame. Fig. 1 shows a side view of a tractor with the arm extended; for extracting wood from the stand. Fig. 2 shows a side view of the same tractor, the arm being retracted and tilted in a position for approaching the wood along the line to the derived location. The wood is gripped by the grab, and the end of the bundle is inserted in the upright. tractor shield. The base arm 2 is pivotably mounted in the tractor frame 1, in which the sliding arm 31 is slidable. The free end of the extension arm 3 has a hinge for the grab 8 and a place for fixing the directional rollers 5 rotatable in the direction of the rope 6 from the stand leading to one optionally two winch drums 7 mounted directly on the tractor arm or in the tractor frame. When the tractor enters the approaching position, it is stabilized by tilting the strut plate 9. After the tractor arm has been erected by the straight-line hydraulic motor 10, its extension to the desired height and the pulling of the rope 6 into the stand is ready to attract the wood. In doing so, it is possible to use cable or winch technology using the advantage of high-positioned directional rollers. The height of the tractor arm is regulated automatically so that the heeling moment due to the pulling in the ropes against. the stabilizing torque of the tractor did not exceed the folding bracing shield. By pulling the necessary amount of wood from the stand to the reach of the tractor arm and folding the arm, it is possible to grab the entire bundle of trunks by grabbing it and insert it into the buoyancy shield. The tractor is capable of pulling the load to the derived location after lifting the lift shield to the transport position while simultaneously releasing the tractor arm in the hydraulic circuit, by pulling the tractor arm to the approached load and blocking its swinging in the hydraulic circuit. one unit, capable of exerting an increased tractive effort even when driving in a straight line, even without driving both axles.

According to the invention, the tractor arm extends the use of the tractor to many handling and forestry operations.

Claims (1)

OBJECTS Tractor arm for approaching timber from pre-crops, characterized in that a base arm (2) is mounted on the tractor frame (2), in which a sliding arm (3j mounted on a free end with directional pulleys (5) leading by ropes (6) is slidable. ) winch drums (7) mounted on the sides of the base arm (2) in the tractor frame (1j or directly on the base arm (2) and suspension gripper (8), the two arms being connected to each other by a linear double acting hydraulic motor (4j and a pivoted in the vertical plane running along the longitudinal axis of the tractor 1 sheet of drawings 2 4 2.2 4 8 Fig. 2