Abstract:
The invention concerns an arrangement for the withdrawal of samples from a flow of harvested crop flowing in a conveying channel in a harvesting machine. A guide element is proposed that includes a region that can be inserted into the conveying channel. Thereby, the harvested crop is forcibly deflected for the withdrawal of a sample.

Description:
FIELD OF THE INVENTION  
         [0001]    The invention concerns an arrangement for the withdrawal of samples from a flow of harvested crop flowing in a conveying channel in a harvesting machine.  
         BACKGROUND OF THE INVENTION  
         [0002]    In agriculture, there is an interest in obtaining information about quality parameters of harvested crop. Several parameters of the harvested crop can already be detected during the harvesting process, such as moisture, as is described, for example, by EP 0 908 086 A on the basis of a combine. For the determination of some other parameters of the harvested crop, such as the percentage of amylum, the withdrawal of samples for later analysis in a laboratory is useful. Here an automation is desirable.  
           [0003]    FR 2 801 380 A describes an automatic sample withdrawal arrangement for a combine. In the grain elevator, an opening is provided that can be repositioned and closed through which grain trickles to a conveyor that fills it into a hose. By clamping off sections of the hose, individual samples are generated, the location of whose origin can be detected by a satellite-supported position detection system. Information regarding the position and the number of the sample is stored in a data bank for later identification.  
           [0004]    According to the disclosures of EP 0 908 086 A and FR 2 801 380 A, one part of a flow of crop trickles through an opening and is then collected until a sufficient amount is available as a sample. Since the sample is taken out of the crop flow on the basis of its gravity, problems can occur when the crop contains a high degree of moisture. For example, the withdrawal of silage from the flow of the crop of a forage harvester can not successfully be accomplished using these solutions.  
         SUMMARY OF THE INVENTION  
         [0005]    The problem underlying the invention is seen in the need for an improved sample withdrawal arrangement.  
           [0006]    An object of the invention is to provide an arrangement for withdrawing a sample from a stream of harvested crop by selectively inserting a guide or deflector into the stream so as to cause a sample of the crop to move to a collection station.  
           [0007]    In this way a region of the guide element is inserted into the flow of the crop with the result that the harvested crop is forced to deflect. The resulting jam provides the assurance that harvested crop is actually withdrawn from the conveying channel. An appropriate selection of the size of the guide element can provide the assurance that a representative sample of the entire cross section of the flow of the harvested crop can be withdrawn.  
           [0008]    One solution is to attach the guide element so that it can pivot freely. Thereby, it can be moved between a sample withdrawal position and a non-operating position. In the non-operating position, it preferably closes an opening in a wall of the conveying channel, so that an undisturbed flow of the harvested crop is possible. In the sample withdrawal position, it frees the opening, and a region of the guide element extends into the flow of the harvested crop. The deflected flow of the harvested crop as a rule then flows through the opening. The pivot axis of the guide element extends appropriately at least approximately transverse to the direction of the flow of the crop. Embodiments are also conceivable with a (exclusively or additionally) movable guide element that can be slid into the conveying channel and slid out of it again.  
           [0009]    Fundamentally, it would be conceivable to attach the guide element to the wall of the conveying channel, pivoted at one end. However, the arrangement of the pivot axis approximately at the center of the guide element (relative to the direction of flow of the crop in the conveying channel) is particularly appropriate. Thereby, the guide element can be used from two sides. If one side is worn after prolonged use, the guide element can be turned, or both sides are used alternately and thereby wear-life is extended. Furthermore, there is the possibility of using a rotary drive with a single direction of rotation.  
           [0010]    There are various possibilities regarding the positioning of the region of the guide element that can be inserted into the conveying channel. In a first embodiment, this region is arranged at an angle of less than 90° to the direction of flow of the crop. With a guide element that can be pivoted, it is then arranged upstream of the pivot axis of the guide element. Thereby the crop maintains its direction of flow, at least approximately, even when the guide element is in the sample withdrawal position. It is, however, deflected through a certain angle. In another embodiment, the region of the guide element extending into the conveying channel in the sample withdrawal position is oriented transverse to the direction of flow of the harvested crop, or the angle between the guide element and the direction of flow is even greater than 90°. In the case of a guide element that can be pivoted, the aforementioned region is then located downstream of the pivot axis of the guide element. A jam of the harvested crop then develops that leads to the crop reaching out of the conveying channel for the withdrawal of the sample.  
           [0011]    In order to withdraw a greater number of samples on larger fields, an automation of the sample withdrawal process is a solution. For this purpose, a drive for the pivoting of the guide element about its pivot axis driven by outside force and an appropriate means for inserting the sample of the harvested crop withdrawn from the flow of the crop into a sample container are appropriate. An appropriate control arrangement controls the drive that brings about the insertion of the guide element into the conveying channel on the basis of a manual input or when pre-determined points in time and/or locality are passed, at which the guide element is pivoted. The harvested crop that, was withdrawn reaches a sample container by means of a conveyor or its own kinetic energy. The actual position of the guide element can be monitored by appropriate sensors. These provide assurance that the sample was actually taken and that the guide element is subsequently returned to its non-operating position.  
           [0012]    Preferably, information is stored, for example, in a data bank on the basis of which the particular sample container can later be identified. For example, a printing of the sample container with corresponding information is conceivable, such as, for example, a bar code or the storing of the information in a transponder connected to the container. It would also be conceivable to store a sample container number or information about the position at which the sample container is located in a data bank. Also, the origin of the location at which the sample was taken may be determined by a position detection system—preferably satellite supported—(or another magnitude on the basis of which the sample can later be identified, such as the time of its generation) can be stored in memory or imprinted on the sample container. Instead of storing the sample in a sample container and to analyze it later in a laboratory, an on-the-spot analysis by means of appropriate implements would also be possible.  
           [0013]    The invention is appropriate for any harvesting machine in which the harvested crop flows through a conveying channel, for example, balers, self-loading forage boxes, combines or forage harvesters. In the case of the latter, the guide arrangement is preferably arranged in the discharge duct. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0014]    The drawing shows two embodiments of the invention that shall be described in greater detail in the following.  
         [0015]    [0015]FIG. 1 shows a schematic left side view of a harvesting machine of the type with which the invention is useful.  
         [0016]    [0016]FIG. 2 shows the discharge duct of the harvesting machine incorporating a first embodiment of a guide element for the withdrawal of a sample from the duct.  
         [0017]    [0017]FIG. 3 shows the discharge duct of the harvesting machine incorporating a second embodiment of a guide element attached to it for the withdrawal of a sample. 
     
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT  
       [0018]    Referring now to FIG. 1, there is shown a harvesting machine  10 , in the form of a self-propelled forage harvester, supported on a frame  12  that is carried by front and rear wheels  14  and  16 . The harvesting machine  10  is controlled from an operator&#39;s cab  18  from which a crop take-up arrangement  20  can be controlled while being within view of the operator. Crop, for example, corn, grass, or the like, taken up from the ground by means of the crop take-up arrangement  20  is conducted to a chopper drum  22  that chops it into small pieces and delivers it to a conveyor arrangement  24 . The crop leaves the harvesting machine  10  to an accompanying trailer through a discharge duct  26  that is mounted for swinging about an upright pivot axis. A post-chopper reduction arrangement or kernel processor  28  is located between the chopper drum  22  and the conveyor arrangement  24  through which the crop to be conveyed is conducted tangentially to the conveyor arrangement  24 .  
         [0019]    [0019]FIG. 2 shows a vertical section along the discharge duct  26 . An opening  30  is provided in the upper wall of the discharge duct  26 . Within the opening  30 , a guide element  32  is located that takes the form of a flat sheet metal plate that is supported in bearings so as to pivot about a pivot axis  34  extending horizontally and transverse to the plane of the drawing. In plan view, the guide element  32  may be circular or rectangular in shape. Relative to the direction of the flow of the crop, that is indicated by the arrow  36 , the pivot axis extends through the center of the guide element  32 . A drive  38 , actuated by outside force, in the form of an electric or hydraulic motor using transmission elements, not shown, selectively causes a rotation of the guide element  32  about the pivot axis  34 . FIG. 2 shows the guide element  32  in its sample withdrawal position in which the harvested crop flowing through the discharge duct  26  impinges upon the region of the guide element  32  at an angle of approximately 45°, which region is located (relative to the flow of the crop) upstream of the pivot axis  34 . Crop which impinges on this region of the guide element  32  is deflected upward by the guide element  32 , so that it reaches a sample container  40 . The guide element  32  can be brought into a non-operating position, by the drive  38 , in which it extends parallel to the adjoining wall of the discharge duct  26  and closes the opening  30 . The sample container  40  may be, for example, a bottle, a paper bag or a box. The sample container  40  is extracted from a magazine by an arrangement, not shown, for example, a gripping arm, and is returned to the magazine after being filled with the sample of the harvested crop. An electronic control assigns a place for the sample container  40  in the magazine, for correspondence to that location at which the sample was taken, for later evaluation. The use of a hose as suggested in FR 2 801 380 A would also be conceivable for the retention of the sample.  
         [0020]    [0020]FIG. 3 shows a second embodiment of a guide element  32 . Elements corresponding to those of the first embodiment are given the same number call-outs. However, FIG. 3 shows a horizontal section along the discharge duct  26 . The discharge duct includes the two side walls shown in FIG. 1. In one of these, the opening  30  is provided for the guide element  32 , that can pivot about the pivot axis  34  extending vertically. In the sample withdrawal position shown, the region of the guide element  32 , extending into the interior of the discharge duct  26 , is arranged downstream of the pivot axis  34  relative to the flow of the harvested crop. The harvested crop impinges upon the guide element  32  at an angle of approximately 135°. Here, a back-draft develops that results in the harvested crop reaching the sample container  40 . In this embodiment, the drive  38  is also arranged to bring the guide element  32  into a non-operating position, in which it extends parallel to an adjoining wall of the discharge duct  26  and closes the opening  30 .  
         [0021]    The arrangement, according to the invention shown here, makes it possible to withdraw samples automatically from the discharge duct  26  of the harvesting machine  10  that takes the form of a forage harvester. These samples are fundamentally important for the development of calibrations of NIR measurement systems. Furthermore a GEO-referenced sample withdrawal of test strips is possible during the harvest. In addition, the owner is offered the possibility of checking the accuracy of a moisture content measuring system or a control system for quality parameters of the harvested crop and, if necessary, to calibrate these anew.  
         [0022]    Having described the preferred embodiment, it will become apparent that various modifications can be made without departing from the scope of the invention as defined in the accompanying claims.