Device and method for measuring the properties of hay using near infrared spectroscopy on a large square baler

Abstract

A DEVICE AND METHOD COMPRISING A LARGE SQUARE BALER WITH A PRE-COMPRSSION CHAMBER THAT ACCUMULATES HAY AND MOVES IT INTO THE COMPRESSION CHAMBER, ONE OR MORE NEAR INFRARED SPECROCOPY (NIRS) SENSORS MOUNTED NEAR THE TOP OF THE PRE-COMPRESSION CHAMBER, A MEANS TO READ INPUTS FROM THE SENSORS ONLY WHEN THE STUFFER FORKS ARE MOVING HAYFROM THE PRE-COMPRESSION CHAMBER INTO THE MAIN CHAMBER AND A PROCESSOR TO AVERAGE MULTIPLE READINGS FROM THE NIRS SENSORS FROM THAT INTEVAL.

Claims

1. A hay baler of the type having a pre-compression chamber with stuffer forks that are activated when a set density of hay in the pre-compression chamber is reached, with a NIRS sensor located near the top of the pre-compression chamber with a means to activate readings from the NIRS sensor by a processor for the period of time when the hay in the pre-compression chamber is moving past the NIRS sensors.

2. A hay baler as in claim 1 where the processor has in memory values expected for the reflective readings from the NIRS sensor for the net energy of the hay, averages a predetermined set of readings originating I from the NIRS sensor, compares that to the expected readings in memory and assigns a net energy value to the flake of hay being measured.

3. A hay baler as in claim 1 where the processor has in memory values expected for the reflective readings from the NIRS sensor for the in vitro dry mater digestibility of the hay, averages a predetermined set of readings originating from the NIRS sensor, compares that to the expected readings in memory and assigns an in vitro dry matter digestibility to the flake of hay being measured.

4. A hay baler as in claim 1 where the processor has in memory values expected for the reflective readings from the NIRS sensor for the neutral detergent fiber of the hay, averages a predetermined set of readings from the NIRS sensor, compares that to the expected readings in memory and assigns a neutral detergent fiber value of hay being measured.

5. A hay baler as in claim 1 where the processor has in memory values expected for the reflective readings from the NIRS sensor for the acid detergent fiber of the hay, averages a predetermined set of readings originating from the NIRS sensor, compares that to the expected readings in memory and assigns an acid detergent fiber value to the flake of hay being measured.

6. A hay baler as in claim 1 where the processor has in memory values expected for the reflective readings from the NIRS sensor for the protein of the hay, averages a predetermined set of readings originating from the NIRS sensor, compares that to the expected readings in memory and assigns a protein value to the flake of hay being measured.

7. A hay baler as in claim 1 where the processor has in memory values expected for the reflective readings from the NIRS sensor for the moisture of the hay, averages a predetermined set of readings originating from the NIRS sensor, compares that to the expected readings in memory and assigns a moisture value to the flake of hay being measured.

8. A hay baler as in claim 1 where there are between 2 and 10 individual NIRS sensors located near the top of the pre-compression chamber and the processor averages the readings from the the sensors present.

Description

BRIEF DESCRIPTION OF SEVERAL VIEWS OF THE DRAWINGS

[0014] FIG. 1 is a typical near infrared spectroscopy sensor, connected to the main processor with further connections to alternative display, bale tagger and telemetry communication.

[0015] FIG. 2 shows the components of a typical large square baler with a hay pick-up, a pre-compression chamber and the main chamber.

[0016] FIG. 3 is a pre-compression chamber with the density sensing door located at the bottom of the pre-compression chamber alternatively used on large square balers.

[0017] FIG. 4 is a side view of the pre-compression chamber with NIRS sensors mounted alternatively on the front, back and side.

[0018] FIG. 5 is a pre-compression chamber with an example of multiple NIRS sensor.

DETAILED DESCRIPTION

[0019] Near infra-red spectroscopy is read from a sensor by emitting a light thru a lens 1, FIG. 1, and reading the reflection of that light back thru the same lens 1 that is mounted on a sensor enclosure 2. The sensor enclosure also houses a power supply delivering DC power to the light and recording the reflective values taken from the light. The level of reflection is then sent as a message to a processor which alternatively could be housed separately or within the sensor enclosure 2. The processor has a software file with the expected values of reflection compared to a level of quality constituents including: net energy, in vitro dry matter digestibility, acid detergent fiber, neutral detergent fiber, protein and moisture. After the comparison is completed, the processor 3 averages multiple readings communicating the value to a display 4. Alternatively, the processor can communicate the values to a bale tagger 5 or a telemetry module 6 which will communicate the values to a remote receiver.

[0020] Referring to FIG. 2 a large square baler picks up hay with a pick-up head 7 and the pick-up teeth 8 move the hay to a pre-compression chamber 9 where the packer fingers 10 continue to move the hay into the pre-compression chamber. A door, 11 is in the closed position at the top of the pre-compression chamber holding the hay in place in the pre-compression chamber 9 as the packer fingers 10 continue to fill the pre-compression chamber up with hay. The door 11 is held in place by a tension device 12 until a desired density of hay is reached and then the tension device allows the door to open and for hay to pass into the chamber 13. Each time the door opens, passing hay into the chamber a flake 14 is formed as the hay is compacted by the plunger 15.

[0021] Referring to FIG. 3, alternatively the door 11 held in place by a tension device 12 can be located at the bottom of the pre-compression chamber 9. In this configuration the hay being brought into the pre-compression chamber is held in place by retention fingers 16 until hay in the pre-compression chamber reaches a desired density and the door is pressed down signaling to the retention fingers 16 to open and release the hay into the bale chamber to form a flake 14.

[0022] In both configurations (door at the top of the pre-compression chamber, FIG. 2 or at the bottom of the pre-compression chamber, FIG. 3, when the door opens it sends a signal to the stuffer forks 22 to engage and move the hay up into the bale chamber 13. The stuffer forks clear the hay out of the pre-compression chamber in steady movement over a 30 millisecond to 2 second interval when they are activated. This state of movement of the hay provides the opportunity to sense the NIRS on multiple samples with similar density as the hay moves past the NIRS sensors.

[0023] Referring to FIG. 4, the NIRS sensors can be located on the front of the pre-compression chamber 17, on the side of the pre-compression chamber 18, or on the back of the pre=compression chamber 19. In any of the 3 alternative positions listed here, the NIRS sensors are placed as close to the top of the pre-compression chamber as possible, to take reading from as much of the hay as possible as it passes uniformly by the sensors. The NIR sensors in any position described herein are triggered to start reading when the stuffer forks 22 start to move signaled by sensor 20. The processor 3 controls the frequency of reading for the NIRS sensors 17, 18 and/or 19 from 5 times per second up to 1000 times per second. The processor signals the NIRS sensors to stop reading when a sensor 21 indicates that the stuffer forks have reached their maximum upward travel or alternatively, when a distinct change in reflective readings from the NIRS sensor is observed due to the state of all the hay being moved out of the pre-compression chamber. By controlling the reading based on movement of the stuffer forks 22, a string of readings from the NIRS sensors will always be on a state of hay with similar density and therefore have a similar reflective surface.

[0024] A large square bale will have between 20 and 50 individual flakes 14 and with the NIRS sensors being controlled by the movement of the stuffer forks, each flake will have multiple readings from the NIRS sensor, of between 5 and 1000 per cycle of the stuffer forks or per flake, that can be averaged by the processor for storing or communicated the feed constituent quality values desired to be measured. In most cases, one NIRS sensor placed in the alternative locations at the top of the pre-compression chamber provides for a representative sample of the hay. The processor can be programmed to average all the flakes and derive a bale average for the feed quality being measured. Referring to FIG. 5 two or more NIRS sensors, as an example 23, 24, 25 and 26 can be mounted in either the front or the back of the pre-compression chamber, providing for a more complete test of the bale when the processor combines reading from the multiple sensors and averages all of the values together.