FI116370B - Feed wheel friction surface - Google Patents

Description

! 116370

FEEDING WHEEL Friction

The invention relates to the structure of the feed wheel of a harvester harvester head and in particular to the shape of a wood-contacting surface, referred to herein as a friction surface. Such a feed wheel is for longitudinal feeding of wood through the felling head pruning apparatus and includes a center plate and a cylindrical jacket portion having frictional surface extending means for supplying the feed force and limiting the penetration of these feed power means into the wood.

Most harvester harvester heads are equipped with various feed rollers 10, which are designed to make the tree move through the pruning line. The introduction of wood and the pruning equipment resist the passage of wood. In order to achieve sufficient traction, the feed wheels need to be pressed against the tree trunk. On the other hand, it is not desired to leave significant damage to the wood frame, which could reduce the value of the wood in further processing, such as in the plywood industry.

15 Various flexible wheel solutions, such as rubber roller chain combinations, have been used to address the requirement for sufficient grip and harmless feeding. This has led to heavy feeder solutions that are expensive to purchase and maintain. The life span of these combinations has also remained quite limited.

Another solution, while maintaining sufficient grip, is the various fixed feed wheels with silicon wedges. The advantages of these wheels are light weight, low cost of ownership and low maintenance. The disadvantages are often too deep, the damage caused by the spike through the tree: \: bark. In some applications, the prongs are replaced by ribs, but this results in the bark and sometimes the surface tree coming loose: * ·. · You.

* · '···' 25 In general, the damage caused by spikes is minimized by using Mata pond spikes. However, in this case, there is an easy loss of grip, especially during a given year, when the shell is easily peelable (Nila time). The same problem comes with: the thick-like pine base.

Another way is to increase the number of peaks, but it is expensive and also a problem * ·. : 30 is that the spacing between the peaks fills easily. The clogging problem also applies to ribbed wheels:: * ·. It should be noted that in practice, a certain depth of damage below about 4 mm below the shell is still acceptable, since any known feeder wheels will not achieve much smaller damage.

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It is an object of the invention to provide a completely novel solution so that the above problems can be solved. In particular, it is an object of the invention to provide a feed wheel and a friction surface thereof which is inexpensive, lightweight, and has a grip grip, durable and low maintenance. It is also an object of the invention to provide a feed wheel and a friction surface that does not significantly damage the wood surface.

This object is achieved by the feed wheel and its friction surface, which is essentially characterized by what is stated in the characterizing part of claim 1.

Preferred embodiments of the invention are set forth in the dependent claims.

According to the invention, the feed force transmitting member is a spike and the penetration depth limiting member is a rib, such as a square bar. The invention is based on an advantageous combination of the means for transmitting the feed force and the means for limiting their penetration into the wood. In the feed wheel of the invention, the means for transmitting the feed force 15 extend through the bark of the wood to the wood material and thus prevent slipping even if the bark is easily peelable. The limiting members are also shaped to transmit the feed force to the surface of the wood. However, their most important function is to limit the feeding of the feeder impeller means to the wood. In such a solution, the feed surface must be grip, durable and low maintenance. In addition, the feed surface 20 does not significantly damage the wood surface. When using spikes and ribs'; · · 'Provides a simple and inexpensive structure.

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In a further preferred embodiment of the invention, the tines and ribs are fixedly arranged over a cylindrical casing member in a helical sequence. With a spiral spike, ·. : A square bar has at least two significant benefits. Therefore, the rotation becomes more smooth, because the cogwheels rotate more smoothly than the straight gears. . deep depression and peak trace in wood. Secondly, the grooves between the prong · square bar strips remain cleaner because each turn the groove · · * feeds the gripped bark or bark slightly forward and outward to the feed roll edge: *: 30 in.

In a preferred embodiment of the invention, the pattern formed by the friction surface is: '': substantially symmetrical with respect to the plane of the center plate. The pattern may be as in e.g. an arrow-shaped inclined gear. In this case, the same feed wheel is pivotable and 116370 3 can be used as the right and left feed wheels, provided that the symmetry plane in the center plate plane is placed in the center of the feed wheel.

One very important factor in minimizing damage is that because the feed force-transmitting edges are more abundant than the conventional tine roller, the compression pressures of the feed rollers 5 against the wood can be reduced by about 10-15% depending on the conditions. This is a major benefit not only in terms of damage, but also in terms of fuel consumption and grapple strain.

A preferred embodiment of the feed wheel according to the invention is to make it by casting, whereby a pattern like the one described above is produced in a casting process at once. The invention will now be explained in more detail with reference to the preferred embodiment of the invention

Fig. 1 shows a friction surface of a feed wheel according to the invention and its cross section X-X,

Figure 2 is a side elevational view of the feed wheel of Figure 1, and

Figure 3 is a front view of the feed wheel of Figure 1.

The figures show a preferred embodiment of the feed wheel of the invention and its friction surface. The feed wheel comprises a plate-like center plate 3 and therein; ': an associated cylindrical jacket portion 4 having friction surface 5 having means for primarily supplying feed force 1 and penetration of means for supplying power to these means for supplying force: * ·. · In this embodiment, means 1 are. \: The spikes and bodies 2 are ribs.

In a preferred embodiment of the invention, known peaks are used. This spike consists of pieces cut by a circular bar with a diagonal cut. The piece is cut · 25 · from the round bar at an angle of approximately 30 degrees from the perpendicular, so that the following cut • · ·: is made when the bar is rotated 180 degrees about its central axis.

, [·, The spike is placed flat on the surface of the feed roller rim and is generally oriented with the other planar surface in the feed direction and secured, for example, by welding. Thus, the spike is not · · "* a pointed cone, but preferably has a relatively wide, sharp-edged 1 · '': 30 female toothed tip.

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The rib, in turn, is a smaller square bar than the previous one, which is cut by straight cuts into pieces of suitable length. The rib is mounted angled over the rim portion of the feed 116370 4 rolls, preferably such that the sides of the square bar are the same on both sides of the bar relative to the diaper surface. The weld seams fill the gap between the lower sides and the sheath surface on both sides of the square bar.

The tines and the square bars are suitably arranged in a row so as to form a spi-5 ribbon advancing on the sheath surface of the feed roll. The edge can have two spikes in a row (side by side) and then a square rod and a spike or two spikes and so on. In the next row there is only one chopper on the edge then follow the square bar and again a spike or two spikes and so on. The spikes and square bars are fixed to the surface of the feed wheel, for example by welding, as described above. However, this representation of spikes and ribs is primarily intended to describe the formation of friction surface shape structure by two types of geometric elements. This geometric shape can be achieved by many other manufacturing methods, such as machining.

Fig. 1 shows Fig. 5, 15 formed on the cylindrical surface of the feed wheel consisting of spikes 1, in which case the planar surface is on the right side. The feed direction is the right direction of the arrow 11. The platform surface is more efficient to transport the wood in the feed direction than the cylindrical surface of the opposite side of the peak. The apex angle of the tip to the wood is approximately 60 degrees. Between the tines or the pair of tines there is a square bar portion 2 whose edge forms a blunt tip angle (about 20 to 90 °) against the wood. The rib is clearly below the peak tip height. Spikes and rails; The vats are welded by uniform welding so that a relatively smooth-bottomed groove is formed between the prong rib ribs.

* ♦ · ': The tines and ribs together form a ribbon chain or row at an angle • *:' * ί a relative to the center axis of the feed wheel. This angle can be 25 ... 45 degrees.

* * · * I ·. ···. Figure 2 is a side view of the main structure of the feed wheel.

The partially cut point shows the cylindrical surface 4 of the feed wheel and the center plate 3 where. . there may be relief holes. The cylindrical surface and the center plate are integral together. Input: The rotation axis 9 of the impeller and the input wood 10 are shown in the figure.

. Fig. 3 shows the center plate 3 of the feed wheel, its relief holes 6, the mounting holes

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30 7 and center hole 8 which centers the feed wheel. This feed wheel is mounted 1; a suitable rotary power unit such as a hydraulic motor (not shown). In its operation, the feed wheel rotates about its axis of rotation 9 by means of a power unit, preferably a hydraulic motor, to which it is secured by means of fastening holes 7 in the center plate 3, rotating the wood 10 in its direction of rotation.

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The position of the peak and the tip or edge of the square bar, as outlined above, is not necessarily symmetrical to the surface of the wood, but is preferably at a steeper angle to the feed side. However, the interchangeability of a wheel with a right and left wheel does not suffer. The tip of the peak or square edge is preferably sharp, but mo-net transforms are possible in the form of a peak and a square.

The invention is not limited to the preferred embodiment shown, but may vary within the scope of the inventive idea of the claims.

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Claims (5)

A friction surface of a feeder wheel used in the chopper ends of the loader harvesters, the feeder wheel being intended for longitudinal feeding of the tree (10) through the chopping end of the chopper end, and to which the feeder wheel includes a center plate (3) and a cylindrical sheath portion (4), on whose frictional surface (5) there are means (1) which mainly mediate feeding force, and such means (2), which limit the penetration of the feeding force (1) into the wood substance, characterized in that means (1), which mediates feeding force, is a tooth (1), and means limiting intrusion is a stitch, such as a square stitch (2). Feed wheel according to claim 1, characterized in that teeth (1) and rods (2) are arranged on cylindrical casing part (4) as a spiral-twisted chain. Feed wheel according to claim 1, characterized in that the chain is either alternately tooth-closed-tooth or pair-tooth-tooth-closed-tooth, and that the level of the surface of the tooth is suitably parallel to the axis of rotation of the cylindrical casing part of the roller. Feeder wheel according to the patent claims 1-3, characterized in that the figure forming the friction surface is substantially symmetrical with the level of the center plate. Feeder wheel according to any of claims 2-3, characterized in that it is one. casting. »'* • * · •> * • t •» * «· <I I'»