Crop weighing apparatus for an agricultural machine
A weighing apparatus for bales as they are released from the bale chute of an agricultural baler has a weighting table supported on a first side of a support frame by a single load beam and supported on a second side by a support element. The weighing apparatus has a mechanism for measuring the inclination of the weighing table relative to the horizontal as well as a load beam and processor. The processor receives the signal from the load beam and based upon the sensed inclination provide an indication of a weight supported by the weighing table.
1. A weighing apparatus for weighing bales on a bale chute of a square baler, the weighing apparatus comprising:
a weighing table having a width, oriented generally normal to a direction of bale movement across the bale chute, supported on a first side of a support frame by a single load beam and supported on a second side by a support element having two or fewer degrees of freedom; and
a mechanism for measuring an inclination of said weighing table relative to the horizontal and circuitry configured to process an output signal of the single load beam based upon the sensed inclination, dimensions and center of gravity of the bale and the relation of the center of gravity to at least one side support to provide an indication of a weight supported by said weighing table.
2. The weighing apparatus of claim 1 , wherein the circuitry is further configured to compute a correction factor to be applied to the force sensed by the load beam based upon the measured inclination of the weighing table; the correction factor representative of a percentage of the weight of the bale applied to the load beam.
3. The weighing apparatus of claim 1 , wherein the circuitry is further configured to read a correction factor from a look-up table and the correction factor is applied to the force sensed in the load beam based on the measured inclination of the weighing table.
4. The weighing apparatus of claim 1 , wherein the circuitry is further configured to receive a correction signal obtained from a left-right indicator of the baler to compensate for errors in the through section of a bale;
the left-right indicator configured to compare the path of the baler with a swath path and indicates a direction of the middle of the swath with respect to the path of the baler; and
the circuitry configured to determine a bale weight correction factor as a function of the distance between the path of the baler and the center of the swath and apply the bale weight correction factor to the force sensed by the load beam.
5. The weighing apparatus of claim 1 , further comprising deflector plates arranged to move the center of gravity of the bale to a weighing position when leaving the baling chamber.
6. The weighing apparatus of claim 1 , wherein the supporting element is a ball joint.
7. The weighing apparatus of claim 1 , wherein the supporting element is a bearing.
8. The weighing apparatus of claim 1 , wherein the supporting element is a metal beam having the same dimensions and properties as the load beam.
9. The weighing apparatus of claim 1 , wherein the load beam is connected at one to the weighing table at the other end to the support frame and has a load sensor located in between the two ends.
10. The weighing apparatus of claim 9 , wherein the load beam comprises an elongated rectangular bar with connection holes at each end and the load sensor is located between the two connection holes, wherein the load beam is connected at one end by a bolt to the weighing table and at its other end through a bolt to the support frame.
11. The weighing apparatus of claim 1 , in combination with a square baler, wherein the weighing device is connected to the bale chute of the square baler.
12. A square baler comprising:
a bale chute having a weighing table, the weighing table having a width, oriented generally normal to a direction of bale movement of the chute, supported on a first side of a support frame by a single load beam and supported on a second side by a support element having two or fewer degrees of freedom; and
a mechanism for measuring an inclination of said weighing table relative to the horizontal and circuitry configured to process an output signal of the single load beam based upon the sensed inclination, dimensions and center of gravity of the bale and the relation of the center of gravity to at least one side support to provide an indication of a weight supported by said weighing table.
13. The baler of claim 9 , further comprising
a left-right indicator configured to compare a desired swath path with respect to a current path of the baler and indicate the location of the swath with respect to the path of the baler; and
the circuitry configured to determine a bale weight correction factor as a function of a difference between the path of the baler and the swath path, wherein the correction factor is applied to the indication of weight supported by the table.