BALING DEVICE

Description

FIELD OF THE INVENTION

[0001] The present invention relates to a baling apparatus and in particular to a monitoring and / or a control system for a baling apparatus.BACKGROUND

[0002] Round balers are well known in the art. Such balers pick up a harvested crop from a swath or windrow and feed the harvested crop into a baling chamber where it is formed into a cylindrical bale.

[0003] The harvested crop is drawn into the baler by a driven pickup apparatus and directed to a baling chamber. The baling chamber includes driven means such as rollers in order to form a bale within the baling chamber. These drive means are conveniently driven from the Power Take Off (PTO) of a tractor towing the baler. It is known, for example from EP 3 062 600 to provide a split drive from the PTO to each of the feeding side (pickup) and forming side (baling chamber) drive means. The load on each of these drives will be dependent upon the flow rate of harvested crop being processed by each of the feeding side and forming side drives. The flow rate of harvested crop can be increased by increasing the speed of the tractor towing the baler over the swath or windrow and decreased by decreasing the speed of the tractor. The flow rate is also affected by the density of the harvested crop in the swath or windrow such that an operator may wish to increase the speed of the tractor when approaching a swath or windrow of low density in order to maintain an even flow rate of harvested crop to the baling chamber or decrease the speed of the tractor in order to avoid overloading when processing a swath or windrow of high density.

[0004] Round balers are usually fitted with an overload device that limits the maximum power that can be processed by the baler drive means. It is usually up to the experience of an operator to understand if the operator is very close to the maximum or if the operator could go quicker or should reduce speed.

[0005] It is an advantage of the present invention that these problems are addressed, in particular by allowing an operator to make better decisions regarding a potentially imminent overload situation.

[0006] A method of controlling a tractor / baler combination is known from EP 1 153 538 A2 (Ford New Holland) which assesses the flow rate of harvested crop in the baler, compares the assessed flow rate with a recommended flow rate and if the assessed flow rate differs from the predetermined flow rate by more than a predetermined amount, changes the speed of advancement of the tractor / round baler combination, and so changes the flow rate of the harvested crop in the round baler.

[0007] A method of controlling a tractor / round baler combination is also known from DE 10 2007 031187 A1 (CLAAS) which the torque of the baling chamber is monitored via a torque sensor.SUMMARY OF THE INVENTION

[0008] According to a first aspect of the present invention, a method of controlling a tractor / round baler combination in accordance with claim 1 is suggested.

[0009] Preferably the flowrate of harvested crop material is determined by the feeding side torque sensor measuring a torque of a drive shaft driving a pick up unit of the round baler.

[0010] Preferably the step of changing the speed of advancement of the tractor / round baler combination comprises the control unit sending a signal to a user terminal to signal to an operator that the speed of advancement of the tractor / round baler combination should be changed. Alternatively, the step of changing the speed of advancement of the tractor / round baler combination comprises the control unit sending a signal to an engine management system of the tractor that the speed of advancement of the tractor should be changed.

[0011] Further preferred embodiments are defined by the appended claims.

[0012] According to another aspect of the present invention a tractor / round baler combination in accordance with claim 6 is suggested.BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The invention will now be described, by way of example only, with reference to the accompanying drawings, in which: Figure 1 shows a schematic side view of a round baler for use with the present invention; Figure 2 shows a schematic view of a drive arrangement for use with the present invention; Figure 3 shows a schematic arrangement of a tractor and a baler; Figure 4 shows a schematic view of electronic aspects of the present invention; Figure 5 shows a flow diagram illustrating the stages of operation of a baler in accordance with a first mode of operation of the present invention; and Figure 6 shows a flow diagram illustration the stages of an alternative mode of operation of the present invention. DETAILED DESCRIPTION OF SPECIFIC EMBODIMENTS OF THE INVENTION

[0014] The invention will now be described in the following detailed description with reference to the drawings, wherein preferred embodiments are described in detail to enable practice of the invention. Although the invention is described with reference to these specific preferred embodiments, it will be understood that the invention is not limited to these preferred embodiments. But to the contrary, the invention includes numerous alternatives, modifications and equivalents as will become apparent from consideration of the following detailed description.

[0015] Referring first to Figure 1 a baler 2 which creates round bales from a harvested crop is shown. In operation, the baler 2 is towed by an agricultural vehicle, such as a tractor 4, to which the baler is connected (Figure 3).

[0016] A pick up unit 6 picks up harvested crop material from a ground surface while the baler is towed over the ground. The harvested crop material is arranged in a swathe or windrow on the ground in order to be picked up by the baler 2.

[0017] A conveying rotor 8 is provided to transfer the harvested crop material from the pickup unit 6 to a baling chamber within the baler 2. A cutting assembly 10 may also be provided adjacent the conveying rotor 8.

[0018] The baler 2 comprises a front housing 12 and a tailgate or discharge gate 14. The tailgate 14 is pivotally mounted to the front housing 12 about a pivot axis 16.

[0019] In the illustrated embodiment, the baling chamber is a variable diameter chamber. The baling chamber is defined by a number of parallel pressing belts 18 arranged around a number of rollers including driven rollers 20 and idler rollers 22. The baling chamber also includes three further pressing rollers 24,26,28. The first and second pressing rollers define an inlet 30 through which the harvested crop material is introduced into the baling chamber. A wrapping material inlet 32 is defined between the third pressing roller 28 and an adjacent idler roller 22.

[0020] As harvested crop material is introduced into the baling chamber, rotation of the harvested crop material in the direction of arrow A causes a bale B to be formed within the baling chamber.

[0021] The baler 2 also includes a wrapping apparatus 34. In the illustrated embodiment the wrapping apparatus 34 is mounted on the front housing 12 of the baler 2. The wrapping apparatus 34 includes a reservoir in which a reel 36 of wrapping material 38 may be stored. The wrapping material may comprise any suitable material. Suitable wrapping materials include netwrap or film. A leading edge of the wrapping material is drawn from the reel 36 by a pair of dispensing rollers 40, 42 before being introduced into the baling chamber by way of the wrapping material inlet 32.

[0022] When a bale of suitable size has been formed, the wrapping apparatus 34 is actuated and several layers of the wrapping material 38 are placed around the rotating bale B. The wrapping material 38 is then severed by a suitable mechanism (not shown). The tailgate 14 is then displaced by any suitable mechanism in order to allow the wrapped bale to be ejected from the bale forming chamber.

[0023] Figure 2 shows schematically an example drive arrangement of the baler. The PTO shaft 78 of the tractor drives an input shaft 50 of the baler 2. An overload clutch 52 is arranged in the input shaft 50 of the baler 2. In the event of an overload situation, the overload clutch 52 interrupts the input shaft 50 and disconnects the powertrain leading from the tractor motor to the rotating parts of the baler 2. It will be appreciated that such an overload situation is undesirable. It is an advantage of the present invention that operation of the overload clutch 52 is sought to be avoided.

[0024] The input shaft 50 ends in a transmission assembly 54. In the illustrated embodiment, the transmission assembly 54 drives a feeding side output shaft 58 and a forming side output shaft 60. Both shafts start in the transmission assembly. In the illustrated embodiment, the transmission assembly includes a bevel gear 56. The transmission ratio between the input shaft 50 and the feeding side output shaft 58 may differ from the transmission ratio of the input shaft 50 and the forming side output shaft 60 by adapting the bevel gear 56.

[0025] In the illustrated embodiment, the feeding side output shaft 58 drives the pickup unit 6 and the conveying rotor 8, while the forming side output shaft 60 drives the pressing rollers 24,26,28, the driven guiding roller 20 and the driven pulling roller 40.

[0026] A feeding side torque sensor 62 and a forming side torque sensor 64 are arranged within the transmission assembly 54 and provide signals to a control unit 70. The control unit 70 also provides signals to control operation of the baler and operation of the tractor 4. Conveniently the signals are provided by way of a suitable data communication network 72 such as one compliant with the ISOBUS standard (a network in conformance to the ISO 11783).

[0027] An operator may send signals to the control unit 70 by use of a user terminal 76. The user terminal is conveniently located within the operator's cab of the tractor 4. The user terminal 76 may include a keypad and / or a touch screen for communication by the operator with the control unit 70. The control unit 70 may also send signals to the user terminal 76 to provide information to the operator regarding operation of the tractor 4 and the baler 2. The user terminal 76 may include a display screen and, optionally speakers, for communication by the control unit 70 with the operator.

[0028] The control unit 70 may conveniently comprise a single processor located on the tractor 4 or its functions may be split between a first processor located on the tractor 4 and one or more additional processors located on the baler 2, the additional processor(s) being in electronic communication with the first processor.

[0029] The control unit 70 is also able to access a suitable memory 74. The memory 74 may take any suitable form and is in electronic communication with the control unit 70. The memory 74 is adapted to store, in any suitable manner such as a database or look up table, values for the maximum recommended or optimal torque for the feeding output shaft 58 and the maximum recommended or optimal torque for the forming output shaft 60.

[0030] The optimal torque values can be set according to a bale cycle status of the baler 2 since the expected torque value on the forming output shaft 60 will be greater the larger the forming bale in the baling chamber.

[0031] In a first method of the present invention, signals from each of the feeding side torque sensor 62 and a forming side torque sensor 64 are sent to the control unit 70 (steps 100,102 Figure 5).

[0032] The control unit 70 then interrogates the memory unit 74 to determine the maximum recommended or optimal torque for the feeding output shaft 58 and the maximum recommended or optimal torque for the forming output shaft 60 (steps 104,106).

[0033] The control unit 70 then determines whether both of the feeding output shaft torque and the forming output shaft torque are below a predetermined tolerance value of their respective optimal torque values, whether one of the feeding output shaft torque and the forming output shaft torque are within a predetermined tolerance value of their respective optimal torque values or whether one of the of the feeding output shaft torque and the forming output shaft torque are above their respective optimal torque values (step 108).

[0034] If both of the feeding output shaft torque and the forming output shaft torque are below a predetermined tolerance value of their respective optimal torque values, the control unit 70 will send a signal to the user terminal 76 to communicate to the operator that the speed of the tractor 4 may be safely increased (step 110).

[0035] If one of the feeding output shaft torque and the forming output shaft torque are within a predetermined tolerance value of their respective optimal torque values, the control unit 70 will send a signal to the user terminal 76 to communicate to the operator that the speed of the tractor 4 may be maintained (step 112).

[0036] If one of the feeding output shaft torque and the forming output shaft torque exceeds their respective optimal torque values, the control unit 70 will send a signal to the user terminal 76 to communicate to the operator that the speed of the tractor 4 should be decreased as soon as possible in order to avoid an overload situation (step 114).

[0037] In a second method of the present invention, as in the first method, signals from each of the feeding side torque sensor 62 and a forming side torque sensor 64 are sent to the control unit 70 (steps 200,202 Figure 6).

[0038] The control unit 70 again then interrogates the memory unit 74 to determine the optimal torque for the feeding output shaft 58 and the optimal torque for the forming output shaft 60 (steps 204,206).

[0039] The control unit 70 then, again as in the first method, determines whether both of the feeding output shaft torque and the forming output shaft torque are below a predetermined tolerance value of their respective optimal torque values, whether one of the feeding output shaft torque and the forming output shaft torque are within a predetermined tolerance value of their respective optimal torque values or whether one of the of the feeding output shaft torque and the forming output shaft torque are above their respective optimal torque values (step 208).

[0040] If both of the feeding output shaft torque and the forming output shaft torque are below a predetermined tolerance value of their respective optimal torque values, the control unit 70 will send a signal to the engine management system 80 of the tractor 4 to increase the speed of the tractor 4 and a signal to the user terminal 76 to communicate to the operator that the speed of the tractor 4 has been increased and, optionally a signal to the user terminal 76 to communicate to the operator the feeding output shaft torque and the forming output shaft torque detected and / or how far below the predetermined tolerance value of their respective optimal torque values the feeding output shaft torque and the forming output shaft torque detected are (step 210).

[0041] If one of the feeding output shaft torque and the forming output shaft torque are within a predetermined tolerance value of their respective optimal torque values, the control unit 70 will send a signal to the engine management system 80 of the tractor 4 to maintain the speed of the tractor 4 and a signals to the user terminal 76 to communicate to the operator that one of the feeding output shaft torque and the forming output shaft torque are within a predetermined tolerance value of their respective optimal torque values and that the speed of the tractor 4 has not been changed, and optionally a signal to the user terminal 76 to communicate to the operator the feeding output shaft torque and the forming output shaft torque detected and / or that one of the feeding output shaft torque and the forming output shaft torque are within a predetermined tolerance value of their respective optimal torque values, for example by sounding a warning signal or causing at least a portion of the display of the user terminal 76 to change colour (step 212).

[0042] If one of the feeding output shaft torque and the forming output shaft torque exceeds their respective optimal torque values, the control unit 70 will send a signal to the engine management system 80 of the tractor 4 to decrease the speed of the tractor 4 and send a signal to the user terminal 76 to communicate to the operator that the speed of the tractor 4 has been decreased in order to avoid an overload situation (step 214).

[0043] From reading the present disclosure, other modifications will be apparent to persons skilled in the art. Such modifications may involve other features which are already known in the field of balers and component parts therefore and which may be used instead of or in addition to features already described herein.

Claims

1. A method of controlling a tractor (4) / round baler (2) combination comprises the steps of: (i) advancing a tractor(4) / round baler(2) combination through a swath or windrow of a harvested crop material with a tractor PTO operating at a constant speed to power a drive of a baling chamber of the round baler (2) and the round baler (2) operating to pick up harvested crop material; (ii) during step (i) assessing with a control unit (70) receiving signals from a feeding side torque sensor (62) and a forming side torque sensor (64) in order to assess the flowrate of the harvested crop material in the round baler and the torque of the baling chamber drive (iii) comparing the assessed flowrate with an optimal flowrate stored in a memory unit (74) of the control unit (70) and the torque of the baler chamber drive with an optimal baler chamber drive torque stored in the memory unit (74) of the control unit (70); and (iv) if the assessed flowrate differs from the optimal flowrate by more than a predetermined amount or the assessed torque of the baler chamber drive differs from the optimal torque by more than a predetermined amount, the control unit (70) sending a signal to change the speed of advancement of the tractor (4) / round baler (2) combination, and hence changing the flowrate of biological matter in the round baler (2) and the torque of the baler chamber drive.

2. A method of controlling a tractor (4) / round baler (2) combination according to claim 1, characterised in that the flowrate of harvested crop material is determined by the feeding side torque sensor (62) measuring a torque of a drive shaft (58) driving a pick up unit (6) of the round baler (4).

3. A method of controlling a tractor / round baler combination according to claim 1 or claim 2, characterised in that the step of changing the speed of advancement of the tractor (4) / round baler (2) combination comprises the control unit (70) sending a signal to a user terminal (76) to signal to an operator that the speed of advancement of the tractor (4) / round baler (2) combination should be changed.

4. A method of controlling a tractor / round baler combination according to claim 1 or claim 2, characterised in that the step of changing the speed of advancement of the tractor / round baler combination comprises the control unit (70) sending a signal to an engine management system (80) of the tractor (4) that the speed of advancement of the tractor (4) should be changed.

5. A method according to any one of claim 1 to claim 4, controlled by a processor operatively connected to receive and process signals from the feeding side torque sensor (62) indicative of the flowrate of harvested crop material in the baler, from the forming side torque sensor (64) indicative of the torque of the baling chamber drive and the tractor (2) / round baler (4) speed.

6. A tractor / round baler combination including a processor operatively connected to a feeding side torque sensor (62) to detect the flowrate of harvested crop material in the baler, to a forming side torque sensor (64) to detect the torque of the baling chamber drive and the tractor (4) / round baler (2) speed and programmed to carry out the method according to any of claim 1 to claim 5 in accordance with the output of these sensors.