Device and method for transporting agricultural products

Abstract: A device for transporting agricultural products, in particular potatoes, which device comprises a conveyor belt and means for depositing the agricultural products on the conveyor belt from the side of said conveyor belt. At least part of the upper surface of the conveyor belt slopes in transverse direction, at least near said means. The upper surface slopes downward from the edge toward the central portion of the conveyor belt, to a location beyond the centre of the conveyor belt.

Description: The invention relates to a device for transporting agricultural products, in particular potatoes, which device comprises a conveyor belt and means for depositing the agricultural products on the conveyor belt from the side of said conveyor belt, where by at least part of the upper surface of the conveyor belt slopes downward in the transverse direction of the conveyor belt from the side where said means for depositing the agricultural products onto the conveyor belt are located, toward the central portion of the conveyor belt, at least near said means. The invention relates in particular to the transportation of potatoes, but the term potatoes used herein is meant as an example of an agricultural product. Such device is disclosed in GB-A-890160. After potatoes have been mechanically harvested, it is usual to remove earth and the like material therefrom in a device specially intended for that purpose, after which the potatoes thus cleaned are deposited onto a conveyor belt for further transport. It is usual thereby to deposit the potatoes onto the conveyor belt from the side, so that they are subsequently carried away in lateral direction on the conveyor belt. When the potatoes are deposited onto the conveyor belt from the side and subsequently transported on said conveyor belt, the problem may arise that the potatoes are distributed asymmetrically over the conveyor belt, which leads to a reduced capacity of the conveyor belt. When the conveyor belt is driven at a higher velocity by way of compensation, this may cause damage to the potatoes, because they are subjected to a higher load, both upon being deposited onto the conveyor belt and upon leaving the conveyor belt. The object of the invention is to provide a device for transporting agricultural products, whereby said transport takes place in an optimal and efficient manner whilst minimizing the load which is exerted on the agricultural products and which may cause damage to said agricultural products. In order to accomplish that objective the invention is characterized in that said upper surface slopes downward from the edge to a location beyond the centre of the conveyor belt. In practice it has become apparent that this asymmetrical cross-section of the conveyor belt makes it possible to obtain a symmetrical distribution of the potatoes on the conveyor belt once the upper surface of the conveyor belt takes on a substantially flat shape again after having passed the place where the potatoes are deposited onto the conveyor belt. Such a symmetrical distribution makes it possible to utilize the capacity of the conveyor belt optimally. In a preferred embodiment said upper surface is substantially V-shaped in the transverse direction of the conveyor belt, whereby the upper surface comprises a wide sloping surface, on the side where said means are located, and a narrower sloping surface, on the other side of the conveyor belt. In a preferred embodiment the V-shaped upper surface includes a smaller angle with the horizontal on the side where said means are located than on the other side of the conveyor belt. The sloping upper surface preferably includes an angle of 5 - 15 degrees with the horizontal on the side where said means are located, in another preferred embodiment this angle ranges between 9 and 12 degrees. The sloping upper surface preferably includes an angle of 15 - 25 degrees with the horizontal on the side opposite the side where said means are located, in another preferred embodiment this angle ranges between 20 and 23 degrees. The invention furthermore relates to the method for transporting agricultural products, in particular potatoes, as defined in claim 7. The invention will be described hereafter with reference to the figures. The drawing is a diagrammatic cross-sectional view of a conveyor belt, onto which potatoes are being deposited from the side. The drawing shows a conveyor belt 1, which is passed over guide rollers 2, 3, 4. Potatoes 6 are guided from the side of conveyor belt 1 onto the upper surface 7 of conveyor belt 1 by means of a sloping guide 5. Conveyor belt 1 is shown in sectional view, and guide rollers 2, 3, 4 are shown in elevational view. Upper surface 7 of conveyor belt occupies a sloping position at the location of guide 5, because central axis 8 of guide roller 2 includes an angle with the horizontal. This angle is 11 degrees, for example. Upper surface 7 of conveyor belt 1 is inclined at an angle on the left-hand side of the drawing as well, because central axis 9 of guide roller 3 likewise includes an angle with the horizontal, for example an angle of 21 degrees. As is shown in the drawing, the upper surface 7 of conveyor belt 1 is thus gutter-shaped at the location of guide 5, whereby the deepest point of the gutter is located to the left of the centre of the conveyor belt. The drawing furthermore shows in sectional view the return portion of conveyor belt 1 on the underside of guide roller 4, which has a horizontal central axis 10. The guide rollers are all freely rotatable in frame 11 of the device. Since the upper surface 7 of conveyor belt 1 is inclined at an angle near guide 5, a good connection to guide 5 is obtained, whereby potatoes 6 undergo only a relatively minor change in direction upon landing onto the conveyor belt. The load being exerted on the potatoes, which may cause damage to the potatoes, is minimized thereby. It is furthermore apparent from the drawing that potatoes 6 not only tend to roll or slide towards the centre of conveyor belt 1, as indicated by arrows 12, but may readily land beyond said centre. If a larger amount of potatoes is deposited onto conveyor belt 1, the potatoes will be distributed over the conveyor belt in the manner indicated by broken line 13, which distribution will be approximately symmetrical with respect to the centre of the conveyor belt when the V-shape of said conveyor belt is changed into a flat shape. It will be apparent that the illustrated asymmetrical shape of the upper surface 7 of conveyor belt 1 in transverse direction provides a compensation for the asymmetric, that is, from one side, depositing of potatoes 6 onto conveyor belt 1. This increases the capacity of the conveyor belt, as a result of which the velocity of the conveyor belt can be reduced, thus reducing the risk of potatoes being damaged. The illustrated embodiment is merely an example of a device according to the invention. The invention may also be embodied in many other ways.

Claims: A device for transporting agricultural products, in particular potatoes, which device comprises a conveyor belt (1) and means (5) for depositing the agricultural products (6) on the conveyor belt (1) from the side of said conveyor belt (1), whereby at least part of the upper surface (7) of the conveyor belt (1) slopes downward in transverse direction from said side toward the central portion of the conveyor belt (1), at least near said means (5), characterized in that said upper surface (7) slopes downward from the edge to a location beyond the centre of the conveyor belt (1). A device according to any one of the preceding claims, characterized in that said upper surface (7) is substantially V-shaped in the transverse direction of the conveyor belt (1). A device according to claim 2, characterized in that said V-shaped upper surface (7) comprises a wide sloping surface, on the side where said means (5) are located, and a narrower sloping surface, on the other side of the conveyor belt (1). A device according to claim 2 or 3, characterized in that said V-shaped upper surface (7) includes a smaller angle with the horizontal on the side where said means (5) are located than on the other side of the conveyor belt (1). A device according to any one of the preceding claims, characterized in that said sloping upper surface (7) includes an angle of 5 - 15 degrees with the horizontal on the side where said means (5) are located. A device according to any one of the preceding claims, characterized in that said sloping upper surface (7) includes an angle of 15 - 25 degrees with the horizontal on the side opposite the side where said means (5) are located. A method for transporting agricultural products, in particular potatoes, wherein the agricultural products (6) are deposited from the side onto a part of the upper surface (7) of a conveyor belt (1) that slopes downward in transverse direction from said side toward the central portion of the conveyor belt, characterized in that the upper surface (7) slopes to a location beyond the centre of the conveyor belt (1).

Inventors: WONDERGEM JAN, WONDERGEM, JAN
Applicants: MIEDEMA BV
Application year: 1997
Main classification: B65G15
IPC codes: B65G15, B65G47, A01D33, B65G39