FI97785B - Claw harvester feed drum - Google Patents

Description

97785

WITH GRAPH HARVESTER FEED ROLLER

The invention relates to a grapple harvester feed roller 5a as defined in the preamble of claim 1.

In a grapple harvester, the feed rollers are used to move and hold the tree trunk in place during handling. That is, the tree trunk to be treated with the feed rollers is given a firm grip and the frame is moved in the grapple harvester 10 as required for pruning and cutting by rotating the feed rollers between which the frame is compressed and moves as the rollers rotate.

The feed rollers currently in use are usually rubber rollers in which a chain 15 is tightened on the outer surface of the roll, which acts as a gripping member for the tree trunk. This structure has three major drawbacks. Rubber does not withstand the stresses on it, so it breaks and crumbles relatively quickly. On average, the rollers need to be renewed twice a year. Another problem is the need to service the chains that act as the gripping members. They need to be tightened regularly to keep them on top of the roller in stressful use. Third, the chains have poor grip, i.e. they tend to peel on the surface of the trunk when feeding the wood forward.

: * · [: 25 The durability problems described above have been addressed · * · * · with steel rollers, ie the roller is formed entirely of a cylindrical roll of rigid steel with suitable sharp-edged gripping members on the surface. *** I The roller works efficiently and is very durable, • ;; j 30 but problems are caused by the rigidity and inflexibility of the roller. The roller transmits all stresses, vibrations and torsions generated during the handling of the frame, as a damping tower ♦ φφ * · * to the roller supports, bearings, power units and other parts of the harvester. In this way, the steel coils have caused great damage to the grapple harvesters, which has not been compensated for by the significant increase in the service life of the coils.

• · · • · · »* • · • · • · · • · 2 97785

Attempts have been made to eliminate the problems caused by the inelasticity of the feed roller by forming the outer sheath of the feed roller from a number of rings having a strength several times smaller than their diameter in the axial direction and by installing a resilient element under the outer sheath. Such a feed roller is described in Finnish patent publication FI-55106. However, the manufacture of a roll is complex and cumbersome because it consists of several separate parts. In addition, the resilient element 10 under the rings is subjected to high mechanical stress in the same way as in the chain solution described above, when the individual rings move radially relative to each other.

The object of the invention is to provide a novel-15 grapple harvester feed roller which does not have the above-mentioned drawbacks. In particular, the object of the invention is to provide a more durable feed roller, which at the same time effectively dampens the stresses caused by handling the frame, which is also maintenance-free and inexpensive to manufacture.

For aspects of the invention, reference is made to the claims.

The feed roller of the grapple harvester according to the invention comprises a shaft connected to a power unit, which is usually a hydraulic motor, and a sheath around and supported by the shaft: * · *: for obtaining gripping members from the wood to be treated. Various spikes ** [1 ^ pins, sharp-tipped pins, sharp-edged ribs, '"I 30 flat-edged pins, guides, or other surface irregularities that adequately adhere, i.e., provide a sufficient grip on the tree trunk, can be used as gripping members. In accordance with the invention, the feed roller comprises a rubber jacket acting as a flexible and shock-absorbing layer around the shaft.

• · ·

A cylindrical "** rigid metal sheath is arranged on the outer surface of the rubber sheath, which covers substantially the entire size under the rubber sheath, protecting the rubber sheath from the above-mentioned mechanical stress, and on the outer surface of which the gripping members are Preferably, the rubber sheath is mounted between the shaft and the metal sheath by a vulcanizing plant, whereby the rubber sheath is firmly attached to the above-mentioned parts.

Thus, the rubber sheath inside the feed roller according to the invention effectively dampens the stresses on the other structures via the roller shaft, which significantly reduces the damage to the other structures 10. The uniform steel sheath on the outer surface of the rubber, on the other hand, effectively protects the rubber and prevents its wear. In addition, the steel sheath forms a sturdy fastening base for the gripping members, which can, for example, be welded to the surface of the steel sheath. In this way, the gripping members 15 remain firmly in place without tightening and other maintenance work.

Preferably, in order to improve the stability of the rubber sheath, a plurality of attached members are attached to the surface of the shaft, such as flattened flat irons or ribs in the direction of rotation of the shaft. Similarly, similar fastening members can be attached to the inner surface of the metal sheath. Flat irons or ribs hold the damping rubber sheath in place, even if the rubber sheath attachment comes off the surfaces of the shaft or metal sheath.

The invention will now be described in detail with reference to the accompanying drawings, in which Figure 1 shows a feed roller for a grapple harvester according to the invention, *** Fig. 2 shows a second feed roller according to the invention * ·· * ··: 30 without rubber sheath and • · ·: Figure 3 shows the arrangement of the gripping members on the surface of the metal sheath.

*: 1 The feed roller in Fig. 1 has a shaft 1 to be connected to the power unit. 1 is mounted around the shaft. 35 relatively thick annular rubber sheath 3. The cylindrical outer surface of the rubber sheath is coated with a metal sheath 4. In addition, a • · · • »• · · • · · · · · 4 gripping members 2 over substantially the entire area of the metal jacket. from the body of a good infection.

Figure 2 shows the internal structure of the feed roller. Preferably, flat irons or ribs 7 transverse to the direction of rotation of the feed roller are attached to both the outer surface 5 of the shaft 1 and the inner surface 6 of the metal sheath 4. These ribs support the vulcanized rubber mass in this annular space so that the strainer remains securely in place. Correspondingly, annular support rings 8 are attached to both edges of the inner surface of the metal sheath to support the rubber mass and ensure its stability in place. Similarly, the support rings prevent the metal sheath 2 from moving on the rubber sheath 3 20 in the axial direction 1.

The fastening means described above ensure that the relatively rigid flue mass cannot become detached between the shaft 1 and the metal sheath 4, even if its adhesion from the surfaces of these parts is reduced or completely eliminated in prolonged use.

• »

In the embodiment of Fig. 2, the gripping members 2 attached to the outer surface of the metal sheath 4 have pin-like, pointed tips which are attached to the metal **** sheath substantially over its entire area and to the circumferential • · · * 11! 30 in the direction and in the transverse direction.

Figure 3 shows a preferred way of placing the gripping members 2 in the metal sheath 4. Here, the gripping members 2 are rectangular with a straight edge and are substantially shorter than the width of the feed roller. 35 ribs. The ribs are arranged in the direction of the axis 1 evenly evenly in rows and in the circumferential direction of the feed roller in successive rows in the direction of the circumference of the feed roller.

• · · • · • · · * ·· • ♦ 97785 s

Thanks to the arrangement, the points of adhesion of the ribs from the tree trunk are farther apart in the longitudinal direction of the wood, so that the surface fibers of the wood may not be completely chopped when broken.

5 The feed rollers shown in the drawings bite efficiently on the surface of the trunk of the wood to be treated thanks to the sharp and sturdy gripping members and their sturdy metal base 4. However, the stresses and vibrations caused by handling the body do not affect the shaft 1 at full power 10, because there is no rigid attachment between the metal sheath 4 and the shaft 1, but they support each other via a flexible and resilient rubber sheath 3 effectively acting as a damper between the shaft 1 and the metal sheath 4.

The invention has been described in detail above with the aid of the accompanying drawings, the applications of the invention being possible within the scope of the inventive idea limited by the claims.

* · · »· · · ·» · · · · · · · · ··· ···· ··· ···· 9 999 9 • 9 99 • 9 · f * · ·· · ♦ · ♦ • · * ··· 9 9 9 • 99 9 99 9 9 9 • 9 • 99 9 9 · · • · · • • 9 9 9 • 99 • 99 9 »

Claims (9)

1. The feed drum of a claw harvester, to which is associated a shaft (1) in association with a power device, a rubber sheath (3) acting around the shaft (1) as an elastic and shock absorbing layer, and a rubber sheath gripping member (2). for obtaining a gripping contact with the wood to be treated, characterized in that the cylindrical outer surface of the rubber sheath is covered by a uniform and rigid metallic sheath (4), to which the outer surface of the gripping means (2) is attached. Feed drum according to claim 1, characterized in that the metal sheath (4) is perforated. Feed drum according to claim 1, characterized in that the gripping means (2) belong to sharp tips. Feed drum according to any of the preceding claims 1 - 3, characterized in that the gripping means (2) consist of individual spikes. Feeding drum according to any one of the preceding claims 1 - 3, characterized in that the gripping means (2) are formed in the direction of the shaft (1). moldings or combs. • · · · * 6. Feed drum according to claim 5, characterized in that the strips or chambers extend along the entire width of the feed roll *: *. • ··· • · 97785 tein (3) is vulcanized between the shaft (1) and the metal sheath (4). Feeding drum according to any of claims 1-8, characterized in that transverse fastening means (7) are fixed on the outer surface (5) of the shaft 5 (1) and the inner surface (6) of the metal sheath (4) relative to the direction of rotation of the feed roller; and that a support body (8) is attached to the inner edges of the metal sheath of the metal sheath. 10 • · • * «'· · ·% ♦ ··· • ··· ···» ··· ··· ··· t:: · · · • · · ··· ·· »• · · * · · M ··% • · · • ♦ · ·· * t: • ® · φ ·· · »· · · · · · · ·