Patent Application
20140367230
The present invention relates to a rod belt for rod belt conveyors for agricultural machinery.
Conventional rod belts for rod belt conveyors for agricultural machinery have a design as disclosed in DE 195 20 927 A1. These types of rod belts have two or more tensile stress-resistant, elastic, continuous belts extending in parallel which are connected to one another by a plurality of parallel rods arranged transversely with respect to the running direction of the rod belt. For fixing the rods to the belts, the rods have flattened, perforated support areas with which they rest on the belts. The support areas are connected to the belts by rivets or similar fastening means which pass through the support area and the belts.
The support areas are produced by forging, by beating round bars flat at their ends. This is carried out at temperatures of 800° to 900° C., and thus requires a high level of energy input. In addition, the purchase of forging presses requires a large capital expenditure. After the forging, the end of the rod must also be quenched and tempered again in order to restore the original material properties of the round rod, in particular the high wear resistance. Furthermore, the forging of the rod ends is subject to large process-related tolerances, which adversely affects the belt precision.
A rod belt of the generic kind is described in DE 200 11 436 U1. In this rod belt, the rods at their ends are not directly connected to the belts, but instead are each connected via a fastening piece. The fastening pieces are produced by forging from a solid rod. The fastening pieces have a flattened, perforated support area which merges into a fastening area for the rod ends via a bend. The fastening area is formed by a cylindrical sleeve extending in the longitudinal direction of the rods, or by a corresponding blind hole. The rods are made of plastic, and are fixed in the sleeves by jamming. The fastening pieces lie with their support areas on the top side of the belts, and are fastened to the belts by rivets.
The object of the present invention is to provide a rod belt of the generic kind in which the fastening pieces have a very simple design and are therefore also manufacturable in an easy and cost-effective manner.
This object is achieved according to the invention with a rod belt which has the features of claim 1.
According to the invention, the fastening pieces are designed as simple bends. In the installed position, the fastening area of the bends is bent toward the bottom side of the belt. It is thus easily possible to connect the rods to the fastening areas in such a way that the longitudinal axes of the rods are situated in the plane of the neutral fiber of the belts, thus reducing the stress on the belts from torques and forces acting on the rods. In addition, the design of the fastening pieces as bends allows the fastening area in the installed position to be advantageously situated at a small lateral distance from the inner side of the belt. As a result, the usable width of the rods, which is situated in the plane of the neutral fibers of the belts, is greater than for rod ends or fastening pieces bent by forging. The rods are straight over their entire length, so that they may be automatically produced using simple machines.
In one advantageous embodiment of the invention, the fastening pieces are produced as stamped-bent parts or cast parts. These may be produced automatically with very high precision. When fastening pieces produced in this way are used, the belt precision is five to ten times higher than for forged rod ends or fastening pieces.
In another advantageous embodiment of the present invention, the fastening area of the fastening pieces is designed as a strip which extends in the direction of the length of the belt, and which has at least two fastening points for rod ends at a distance from a provided rod division. As a result of this approach, the rod division may be reduced, with the division of the fastening points of the fastening pieces on the belts remaining the same. This has advantages in particular for belts that are provided with cams for positive drive of the rod belts, since the division of the rods may be smaller than the division of the cams.
Further advantageous embodiments of the invention result from the other subclaims.
The invention is explained in greater detail below with reference to embodiments. The associated drawings show the following:
The rod belt 1 illustrated in the drawings is composed of two parallel revolving belts 2. Only one side of the rod belt 1 is illustrated in the drawings. The other side has a mirror-image design, so that the following statements also apply to this side.
The belts in the present embodiment are designed as cam belts, and may be made, for example, of rubber reinforced by fabric inserts 2.1.
Cams 3 which are spaced apart from one another in a division x are provided on the bottom side of the belts 2. These cams 3 are used for the positive drive of the rod belt 1. For this purpose, a drive means, not illustrated, of drive wheels engages with gaps 4 between the cams 3. These types of designs are known from the prior art, and therefore do not have to be explained in greater detail.
The spacing between the belts 2 is provided by rods 5 arranged transversely with respect to the conveying direction of the rod belt 1 and parallel to one another, and with their ends connected to the belts 2.
The fastening pieces 6 have the simple shape of a bend, and are produced as high-precision, wear-resistant, hardened stamped-bent parts. The fastening pieces have a support area 6.1 which has fastening holes 7 spaced apart at a distance from one another. This support area 6.1 merges, in a 90° convex curvature 6.2, into a strip 6.3 which extends transversely with respect to the support area 6.1 and situated perpendicular thereto. The strip 6.3 has three holes 8, which in their longitudinal extension are spaced apart from one another in a division y. The holes 8 are used for fastening the rods 5 to the fastening pieces 6. For this purpose, the rods 5 are provided at their ends with a central journal 9 (
After the rods 5 have been connected to the fastening pieces 6 as described above, the fastening pieces are placed with the bottom side of their support areas 6.1 on the belts 2 so that the holes 7 in the support area 6.1 are aligned with holes 13 provided in the belts 2. Rivets 15 are subsequently inserted through the holes 13 and 7 from below, with connection of a rivet plate 14 in between, and a riveted joint is produced between the fastening pieces 6 and the belts 2, as illustrated in
In the installed position of the fastening piece 6, the strip 6.3 thereof extends at a small lateral distance a (
Since the support areas 6.1 of the fastening pieces 6, viewed in the running direction of the belts 2, have only a narrow extension, further cams 18 may be provided on the top side of the belts 2, diametrically opposite from the cams 3. These cams 18 are used for protecting the support areas 6.1 of the fastening pieces 6 which are fastened to the belts.
The embodiments according to
While this invention has been described as having a preferred design, it is understood that it is capable of further modifications, and uses and/or adaptations of the invention and following in general the principle of the invention and including such departures from the present disclosure as come within the known or customary practice in the art to which the invention pertains, and as may be applied to the central features hereinbefore set forth, and fall within the scope of the invention.
