Mechanical grape harvester with means for continuous monitoring of the weight of the grape harvest

Description

Domaine technique

[0001] The invention relates to a grape harvesting machine capable of harvesting grapes and storing them in a bin while assessing the quantity of grapes harvested. Technique antérieure

[0002] In the vineyard sector, grape harvesting has historically been carried out manually, but is increasingly being carried out mechanically, using a harvesting head mounted on or towed by a harvesting machine that travels through the rows of vines in a vineyard, the harvesting head mechanically separating the grape berries from the vine stocks using a mechanical shaking action and temporarily storing them in a storage bin until the bin is emptied by tipping at a collection point.

[0003] Harvesting machines of this type (see US 2019 / 335650 A1) can be self-propelled (the tractor vehicle carries a harvesting head and spans the row of vines) or towed (the harvesting head spanning the row of vines is towed by a tractor vehicle traveling between two rows of vines).

[0004] It should be noted that "mechanical harvesting" refers to the operation of harvesting grapes using a harvesting machine and "harvest" refers to the harvested grapes.

[0005] In this context, continuously monitoring the weight of the harvest stored in the bin has multiple advantages, such as the possibility for the harvester to know, in real time, the yield per hectare of their plots of land, to establish plot maps that can be used to guide, for example, locally the quantity of fertilizers and / or the volume and type of phytosanitary treatments to be applied or to adapt treatments during the year, or even to respect regulatory quotas of harvest per hectare or even to adjust the quantity of harvest to be delivered to the cellar so that it can be vinified as quickly as possible.

[0006] Thus, patent document FR 2 768 222 B1 describes a continuous on-board harvest weighing device using a first electronic scale evaluating the weight of a weighing platform over which a harvest drive system passes.

[0007] A second electronic balance placed near the first and supporting a known fixed mass is used as a witness so as to correct the dynamic disturbances affecting the two balances in a substantially equivalent manner.

[0008] However, this device requires a drive system capable of containing the grape juice, and it is not designed to avoid the capture of unwanted objects (pieces of vine stock or stakes etc.).

[0009] Patent document WO2018 / 122280 also discloses a harvesting machine and a method capable of continuously measuring the weight of the harvest stored in its bins.

[0010] This weight is assessed by measuring the hydraulic pressure in the machine's lifting cylinders and requires systematic calibration when emptying the skips by comparing the hydraulic pressures in the machine's lifting cylinders before and after emptying.

[0011] This system is unreliable because the oil pressure in the cylinders changes with its temperature, hence the need to carry out specific calibration procedures when emptying the skips.

[0012] The best precision obtained is therefore only achieved statically at the time of emptying, provided that the wheels are very stable at this time.

[0013] The lifting cylinders considered are also the cylinders connecting the chassis plate to the wheels of the machine, thus supporting the weight of the entire harvesting chassis, the harvest being harvested containing unwanted waste and the harvest accumulated in the bins.

[0014] The measurement accuracy is therefore far from satisfactory given the complexity of this process.

[0015] The device and method disclosed by this document are therefore not suitable for continuous and precise measurement of the weight of the harvest stored in the bins during mechanical harvesting. Exposé de l'invention

[0016] The invention aims to provide a means suitable for the precise and continuous control of the weight of the harvest stored in the bins of the harvesting head of a harvesting machine.

[0017] To this end, the invention relates more particularly to a harvesting machine intended to harvest a grape harvest, comprising a chassis mounted on at least one set of wheels which are each movable around a wheel set axis, said chassis being arranged so as to span a row of vines during a mechanical harvest, a shaking assembly for the row of vines mechanically connected to the chassis, capable of separating the grape harvest from the row of vines, a collection and conveying assembly for the grape harvest from the shaking assembly to one or more storage bins, the storage bins each being fixed to an associated bin chair pivotally mounted around a bin pivot shaft mechanically connected to the chassis to ensure emptying of the storage bins, and a device for measuring the weight of the grape harvest accumulated in the storage bins,grape harvesting machine in which each storage bin is connected to the associated bin chair by means of load sensors, the load sensors being elongated bending sensors each comprising two fixing ends, a first fixing end being fixed to the storage bin and a second fixing end being fixed to the associated bin chair so that the storage bin is suspended from the associated bin chair, the fixing ends of the load sensors are arranged above the shaking assembly when the machine is located on a horizontal level ground, each load sensor is powered by the harvest weight measuring device to deliver a sensor signal at any time during the mechanical harvest,and the measuring device is configured to process the signals from the load sensors and continuously or cyclically deliver a measuring signal representative of the weight of the harvest accumulated by the harvesting machine in the storage bins.

[0018] The harvesting machine described above is capable of continuously measuring the weight of the harvest stored in the storage bins during a mechanical harvest while ensuring mechanical maintenance, in particular during mechanical harvesting or emptying.

[0019] The mechanical maintenance of the storage bins is ensured by the load sensors, which fulfill the two functions of suspending each bin from a bin chair associated with it, that is to say avoiding any mechanical fixing of the bin with any element other than the load sensors, and detecting the forces that the storage bins exert on each of them, which allows by adding their sensor signals to deduce the weight of the storage bins and their contents, the grape harvest, which will be transported to the cellar after emptying the bin.

[0020] Each storage bin being mechanically fixed to the associated bin chair, the mechanical stability of the storage bins is ensured, particularly during mechanical harvesting or emptying.

[0021] Furthermore, because the load sensors are located above the shaking assembly, shaking operations cause much less disruption to the sensor signals representing the weight of the storage bins during mechanical harvesting than if they were located at the same horizontal level as the shaking assembly.

[0022] Thus, the characteristics of the harvesting machine effectively allow continuous control of the weight of the storage bins during mechanical harvesting, even on uneven terrain with slopes and inclines, common circumstances in vineyards.

[0023] The grape harvester can have the following characteristics for each storage bin: the attachment ends of the load sensors may be arranged above a center of gravity of the storage bin when the machine is located on a horizontal level ground; when the machine is located on a horizontal level ground, the center of gravity of the empty storage bin may be located more than 15% of a depth of the storage bin below the attachment ends;the machine may comprise at least three load sensors suspending the storage bin from the bin chair, which may be distributed so that two of these sensors are at least 60% of the width of the storage bin apart in a direction substantially parallel to the wheel train axis, and so that two of these sensors are at least 70% of a length of the storage bin apart in a direction substantially horizontal and perpendicular to the wheel train axis, the storage bin being considered in the harvesting position on horizontal, flat ground;the machine may comprise four load sensors suspending the storage bin, a first and a second of these sensors being able to be arranged at a front part of the storage bin and spaced from each other by at least 60% of the width of the storage bin in a direction substantially parallel to the axle of the wheel set, a third and a fourth of these load sensors being able to be arranged at a rear part of the storage bin and spaced from each other by at least 60% of the width of the storage bin, the first and third of the load sensors being able to be spaced from each other by at least 70% of the length of the storage bin in a direction substantially horizontal and perpendicular to the axle of the wheel set, the storage bin being considered in the harvesting position on horizontal flat ground;the storage bin may comprise bin rising edges, the first attachment ends of the load sensors being able to be attached within 20% of a width of the storage bin of one of said bin rising edges; at least one of the load sensors may be located between the storage bin and a driver's cab of the grape harvester and may have a longitudinal axis substantially parallel to the wheel train axis of the grape harvester; and a ratio of a sum of absolute values ​​of the measurement capabilities of the load sensors to an expected maximum total weight of the storage bin may be greater than 2. ; Brève description des dessins

[0024] The present invention will be better understood and other advantages will appear on reading the detailed description of an embodiment taken as a non-limiting example and illustrated by the appended drawings, in which: [ Fig 1A ]- there figure 1A illustrates a side view of a self-propelled harvesting machine according to the invention, in a mechanical harvesting position; [ Fig 1B ]- there figure 1B illustrates a top view of the grape harvester of the figure 1A ; [ Fig 1C ]- there figure 1C illustrates the grape harvesting machine of the figure 1A in a dumping position; [ Fig 2A ]- there figure 2A is a three-dimensional (3D) figure representing a storage bin and its bin chair; [ Fig 2B ]- there figure 2B is a side view of an empty storage bin showing the position of its center of gravity; [ Fig 3A ]- there figure 3A is a diagram showing a bending load sensor and its attachment between a storage bin and a bin chair; [ Fig 3B ]- there figure 3B is an excerpt from a 3D view of the grape harvester of the figure 1A upstream of a storage bin at the level of its attachment to the bin chair; [ Fig 3C ]- there figure 3C is an excerpt from a 3D view of the grape harvester of the figure 1A downstream of a storage bin at the level of its attachment to the bin chair; [ Fig 4 ]- there figure 4 represents the evolution over time of the weights measured by a set of 8 load sensors of a harvesting machine recorded during a mechanical harvest, as well as their sum. Fig 5 ]- there figure 5 represents a block diagram of load sensor signal processing. Description d'un mode particulier de réalisation de la machine selon l'invention

[0025] This embodiment is illustrated by the figures 1A à 5 .

[0026] THE figures 1A à 1C illustrate a 100 grape harvester, the figure 1A showing it in side view in a configuration suitable for mechanical harvesting, the figure 1B being a top view of the machine in this same configuration and the figure 1C being a side view showing the harvester in an emptying configuration.

[0027] The harvesting machine 100 comprises at least one set of wheels 110 supporting in particular a driver's cabin 112 and a shaking assembly 114, located in the harvesting machine 100 by dotted lines, mounted on a chassis 116.

[0028] The wheel set 100 comprises wheels 110a which are each movable about a wheel set axis 110b.

[0029] When the chassis 116 is mounted on or forms part of a tractor chassis supporting the driver's cab, the grape harvester is in a self-propelled version and the tractor chassis then has two sets of wheels for steering and moving the grape harvester.

[0030] The chassis 116 may also have only one set of wheels 110 and then constitute part of a towed grape harvester, which will be towed by an agricultural tractor also comprising a driver's cab and circulating between the rows of vines to move the grape harvester.

[0031] The frame 116 is designed to span a row of vines when the harvesting machine is carrying out a mechanical harvesting operation, an operation during which a harvest is harvested, essentially comprising grape berries detached from the row of vines which bears them, associated with grape juice when the berries are burst, by high-frequency mechanical shaking (of the order of 5 to 10 Hz) applied to the area of ​​the row of vines containing the grape berries by means of the shaking assembly 114.

[0032] The harvest detached from the row of vines is recovered by a collection and conveying assembly 118 fixed to the chassis 116, an assembly comprising for example at least one endless conveyor belt associated with cleats or buckets, and is conveyed to two storage bins 120 located symmetrically on one side and the other of the machine 100, as shown in figure 1B , close to the chassis 116 and behind the cockpit 112, into which it falls to be stored until the storage bins are emptied by tipping, an operation illustrated by the figure 1C with a 120 bucket visibly tilted into a vertical position, i.e. in the emptying position.

[0033] As opposed to the figure 1C , there figure 1A illustrates the harvesting machine in a mechanical harvesting configuration on horizontal ground, with a storage bin 120 in a horizontal position, i.e. in the mechanical harvesting position.

[0034] For the purpose of dumping, each storage bin 120 is mounted on a bin chair 122 with which it is associated, each bin chair being pivotally mounted about a bin pivot shaft 124 mechanically linked to the frame 116 to move the associated storage bin from the mechanical harvesting position to the dumping position.

[0035] In the remainder of this document, the description will generally focus on only one of the storage bins, it being understood that the characteristics of one of the bins and its coupling with the grape harvesting machine, by means of a bin chair for the mechanical aspect, also apply to the other bin.

[0036] There figure 2A shows a 3D view of a storage bin 120 associated with its bin chair 122 and bin pivot shaft 124.

[0037] The storage bin 120 has generally prismatic geometric shapes adapted to conform to the harvesting machine and defining a sealed container of a given volume of harvest with a bin inlet opening 121 of generally rectangular shape when viewed from above, located at the top of the storage bin and through which the harvest is poured.

[0038] The bucket entrance opening 121 has an elongated shape, longer (in the direction of movement of the machine) than it is wide and has a front part 121f corresponding to the front of the grape harvester, close to the driver's cabin, and a rear part 121r corresponding to the rear of the grape harvester, close to the emptying pivot 124 of the bucket chair 122.

[0039] The storage bin can be characterized by its width 120w, corresponding to its maximum extent in a direction substantially parallel to the axis 110b of the wheel train of the machine, and by its length 120l, corresponding to its maximum extent in a direction substantially horizontal and perpendicular to the wheel train axis, the storage bin being considered in the mechanical harvesting position on a horizontal plane ground, as illustrated in figures 2A And 2B , respectively.

[0040] The 120 storage bin has two 120f fixing brackets, visible in particular in the figures 2A , 2B And 3B , arranged in a width of the storage bin near the front part 121f of the bin entrance opening 121, and two rear fixing lugs 120r, visible in particular in the figures 2B And 3C, arranged in a width of the storage bin near the rear portion 121r of the bin entrance opening 121.

[0041] As shown in the figure 2B , the fixing lugs 120f define a front horizontal fixing plane 210 and the fixing lugs 120r define a rear horizontal fixing plane 200, the storage bin being considered in a mechanical harvesting position on a horizontal flat ground, position illustrated in figure 1A .

[0042] The two horizontal fixing planes 200 and 210 are arranged between a horizontal plane defined by the bucket entry opening 121 (and corresponding to the lowest vertical point of the opening 121 when the machine is located on horizontal flat ground, in mechanical harvesting configuration) and a horizontal plane comprising a center of gravity 150 of the storage bucket shown diagrammatically in the figure 2B for an empty storage bin.

[0043] The fixing brackets 120r and 120f, 4 in total, are used to rigidly suspend the storage bin 120 from a bin chair 122 by means of 4 load sensors 132, the storage bin being kept at a distance from the bin chair by means of the load sensors, and held rigidly on the harvesting machine, in particular during mechanical harvesting or emptying operations.

[0044] It is specified that the storage bin may be a simple container comprising walls defining a watertight part suitable for storing the harvest, but it may be made up of several parts, for example a watertight container associated with a chassis which is rigidly fixed to it.

[0045] In the latter case, all the parts constituting the storage bin are suspended from the bin chair by means of load sensors.

[0046] As shown in the figure 3A , each sensor extends along a longitudinal sensor axis 132ax and comprises two fixing ends, a first fixing end 132-1 being fixed to one of the fixing lugs 120f, 120r of the storage bin and a second fixing end 132-2 being fixed to the bin chair 122 so that the storage bin 120 is suspended from the bin chair 122, the sensors forming an assembly for suspending the storage bin from the bin chair.

[0047] "Suspended" means that the storage bin is held entirely in the air by the bin chair via the load sensors 132, without any elements other than the load sensors having a significant contribution to the mechanical holding of the storage bin.

[0048] For example, it is considered that the electrical connection cables 130c connecting the sensors to the measuring device 130 do not constitute elements having a significant mechanical contribution to the maintenance of the storage bin.

[0049] The same applies, where applicable, to electrical cables or hydraulic supply hoses for a sorting table.

[0050] The 122 dumpster chair is a rigid structure surrounding the storage dumpster on 3 sides, in particular opposite the 120f and 120r fixing brackets.

[0051] The fixings are made by means of bolt mounts 133 passing through the bodies of the sensors perpendicular to their respective longitudinal axes, the bolts 133 being visible for example at the figure 3B , such that, during mechanical harvesting, the horizontal axes of the sensors extend horizontally, the longitudinal axes 133ax of the bolts extending vertically, always in a mechanical harvesting configuration on horizontal flat ground.

[0052] The storage bin is thus rigidly fixed to the associated bin chair and can withstand mechanical stresses in mechanical harvesting or emptying configuration.

[0053] The above configuration has the advantage of good support for the storage bin combined with a configuration capable of precisely assessing the weight of the contents of this storage bin and any accessories.

[0054] Such an assembly ensures reliable measurement of the weight of the harvest, since only the entire weight carried by a storage bin rests on the load sensors.

[0055] With regard to the vertical positions of the load sensors, which also have a role of mechanical suspension of the storage bin to which they are fixed, the fixing ends of the load sensors, and therefore the fixing lugs 120r and 120f, are arranged above the center of gravity 150 of the storage bin when the machine is located on horizontal flat ground, the center of gravity of the empty storage bin being preferably located more than 15% of a depth 120d of the storage bin below the fixing ends.

[0056] The depth 120d of the storage bin is understood as the vertical distance separating the highest point of the bin entrance opening 121 from the lowest point of the storage bin, as indicated in the figure 2B , in a horizontal position configuration of the storage bin, that is to say with the storage bin in a harvesting position, the machine being on horizontal flat ground.

[0057] Such a configuration has the advantage of significantly improving the mechanical stability of the suspended storage bin, particularly on uneven and / or sloping terrain.

[0058] In order to limit the disturbances of the weighing by the shaking operation which generates mechanical vibrations not only at the level of the row of vines but also at the level of the harvesting machine, the fixing ends of the sensors are arranged in horizontal planes located above the shaking assembly materializing the zone where the mechanical harvest is located and therefore where the vibrations are maximum, the machine being considered during a mechanical harvest on horizontal ground.

[0059] Such an arrangement has the advantage of moving the sensors away from the area where the vibrations generated for the shaking operation are concentrated, so that the vibration level at the sensor locations remains acceptable for weight measurements.

[0060] Placing the sensors above the center of gravity of the storage bin also increases the attenuation of forces through the inertia of the masses acting at the center of gravity.

[0061] Under normal conditions, the presence of a quantity of grapes in the storage bin will only reinforce its stability, the density of the grapes being higher at the bottom of the tank due to the compaction of the grape berries and the presence of juice.

[0062] As regards the number and horizontal positions of the load sensors on the periphery of a storage bin, preference is given, in a general case, to the arrangement of at least 3 load sensors arranged at a distance from each other, in particular with at least a first sensor arranged at the front of the storage bin, at least a second sensor arranged at the rear of the storage bin and at least a third sensor arranged at a distance from the other sensors in a direction parallel to the axis of the wheel sets, so as to form a support polygon for the storage bin having as large a surface area as possible.

[0063] It is thus possible to have at least three load sensors suspending the storage bin from the bin chair, distributed in such a way that two of these sensors are at least 60%, preferably 70%, even more preferably 80%, apart from the width of the storage bin in a direction substantially parallel to the axle of the wheel set, and that two of these sensors are at least 70%, preferably 80%, even more preferably 90% apart from a length of the storage bin in a direction substantially horizontal and perpendicular to the axle of the wheel set, the storage bin being considered in the harvesting position on a horizontal plane.

[0064] Such a configuration has the advantages of good mechanical stability as well as a homogeneous distribution of the loads to be measured between the sensors, making it possible to minimize the effects of slope or tilt, both for the mechanical maintenance of the storage bin and for measuring the weight of the harvested grapes.

[0065] The arrangement of remote load sensors in a direction parallel to the axle of the wheel set 110b, and therefore in the width of the storage bin, advantageously makes it possible to take into account slopes, the harvesting machine being able to tilt to the left or to the right during mechanical harvesting.

[0066] Similarly, the arrangement of remote load sensors in a direction perpendicular to the wheel set axis 110b, and therefore along the length of the storage bin, advantageously makes it possible to take slopes into account.

[0067] In the present embodiment, each storage bin is suspended by 4 sensors distributed around the bin entrance opening: two in the front part 121f and two in the rear part 121r of the storage bin, arranged symmetrically on each side of the storage bin, close to each corner of the elongated quadrilateral that the bin entrance opening forms when seen from above, thus maximizing the surface area of ​​the storage bin support polygon.

[0068] More specifically, four load sensors suspend the storage bin, a first and a second of these load sensors being arranged at the front of the storage bin and spaced apart from each other by at least 60%, preferably 70%, even more preferably 80%, of the width of the storage bin in a direction substantially parallel to the axle of the wheel set, a third and a fourth of these load sensors being arranged at the rear of the storage bin and spaced apart from each other by at least 60%, preferably 70%, even more preferably 80%, of the width of the storage bin in the direction substantially parallel to the axle of the wheel set, the first and third of the load sensors being spaced apart from each other by at least 70%, preferably 80%, even more preferably 90% of a length of the storage bin in a direction substantially horizontal and perpendicular to the axle of the wheel set wheel,the storage bin being considered in the harvesting position on a horizontal level ground.,

[0069] The positioning of the sensors at a distance of two by two, in a direction of advance of the machine and in a direction perpendicular to the latter, makes it possible to limit errors in measuring the load of the storage bin despite angular positions of the measurement axis different from the axis of the weight of the storage bin depending on the angular positions of the grape harvester on slopes or on a slope and therefore improves the robustness of the measurement of the weight of the storage bin on slopes when the grape harvester goes up or down, and even in the presence of slopes.

[0070] The multiplication of load sensors arranged at a distance from each other around the opening 121 of the skip entrance promotes the reliability of the measurement of the weight of the storage skip and its contents, while also making the mechanical maintenance of the storage skip on the skip chair more reliable.

[0071] The applicant was thus able to measure, for example, using a harvesting machine according to the present mode of claim, errors of less than 1% for each 10% slope range (uphill or downhill) of the land on which the mechanical harvest is carried out, thus showing that the slope of the land does not significantly disrupt the evaluation of the quantity of grapes harvested during mechanical harvesting.

[0072] However, it remains possible to take into account a measurement of the harvesting machine's attitude to calculate the harvest weight even more precisely according to known methods, using a attitude measuring device.

[0073] It is also preferable to fix the first ends 132-1 of the load sensors 132 near rising edges 120a of the storage bin 120, preferably less than 30%, more preferably less than 20%, of the width 120w of the storage bin from one of the rising edges 120a of the storage bin.

[0074] These edges join the bottom of the storage bin to its inlet opening 121 in the manner illustrated by the figure 2A .

[0075] Such a configuration has the advantage of stiffening the attachment of the storage bin to the bin chair, which increases on the one hand the mechanical stability of the assembly and on the other hand the reliability of the machine by reducing mechanical fatigue.

[0076] In the upstream part 121f of the storage bin, the two load sensors are close to the control cabin 112 of the grape harvester 100.

[0077] As shown in the figure 3B , they are fixed between the fixing legs 120f of the storage bin 120 and the bin chair 122 by having their longitudinal axes 132ax positioned along the front side wall of the storage bin 120, and therefore substantially parallel to the wheel axis 110b.

[0078] This configuration has the advantage of limiting the size of the storage bin suspension assembly so that the latter can usefully occupy the space located at the rear of the driver's cabin and therefore increase the harvest storage volume of the harvesting machine without increasing its overall size.

[0079] Downstream of the storage bin, the space constraints are not the same, and as shown in the figure 3C the two load sensors are fixed between the rear fixing lugs 120r of the storage bin 120 and the bin chair 122 with their longitudinal axes perpendicular to the rear side wall of the storage bin and therefore substantially perpendicular to the wheel axle 110b of the grape harvesting machine 100.

[0080] In this document, the characteristics "perpendicular" and "parallel" may be understood respectively as departing from angles strictly equal to 90° and 0°, and respectively include angular ranges of orientations of 90±10° and 0±10°, which may be denoted by the expressions "substantially parallel" and "substantially perpendicular".

[0081] Similarly, the characteristics "vertical" and "horizontal" can be understood respectively as deviating from a strictly vertical direction and a strictly horizontal plane by ±10°, which can be denoted by the expressions "substantially vertical" and "substantially horizontal".

[0082] Other configurations, in number and positioning of sensors are of course possible, depending on the exact configuration of the harvesting machine considered, but the sensors must be used in sufficient number, so that the load capacity of the set of sensors supporting the storage bin is sufficient to support the combined weights of the storage bin, the harvest that it is likely to store and, where applicable, the sorting table equipping the storage bin.

[0083] Each of the two storage bins 120 of the grape harvester 100 can be optionally equipped with a sorting table 126 fixed to the storage bin 120 and located above the bin inlet opening 121.

[0084] Such a sorting table, visible in the figures 1A à 1C , allows the harvest from the mechanical harvest transported by the collection and conveying system to be sorted to reject unwanted waste (leaves, petioles, vine shoots, pieces of vines, etc.) and essentially keep only the harvest in the storage bin.

[0085] Once the bins are filled or a fixed harvest quota is reached, the harvesting machine is taken to a collection point where the storage bins are emptied.

[0086] This collection point is generally a trailer used to transport the harvest to the cellar for vinification.

[0087] The quality of the subsequent vinification, however, depends on the time elapsed between the mechanical harvesting of the berries and their vinification in the cellar.

[0088] This time must be as short as possible to preserve the quality of the harvest, the cellar must avoid receiving several trailers of harvests at the same time which can sometimes wait several hours before being vinified.

[0089] To limit these waiting times, the cellar can impose harvest quotas over time to ensure the quality of the vinification, thus requiring continuous monitoring of the weight of the harvest accumulated in the storage bins 120 during mechanical harvesting.

[0090] To this end, the harvesting machine 100 is equipped with a device 130 for continuously or cyclically measuring the weight of the harvest accumulated in the storage bins, this device being functionally connected to the load sensors 132 of each of the storage bins as represented by the dotted line of the figure 3A , for example by 130c electrical connection cables.

[0091] The measuring device 130 is a sealed electronic box, arranged at the height of the harvesting machine 100 near the various load sensors, configured to supply the 8 load sensors 132 of the two storage bins of the harvesting machine, process the signals 401 to 408 generated respectively by the eight load sensors 132 designated by C1 to C8 on the block diagram of the figure 5 , and continuously or cyclically deliver a measurement signal representative in real time of the weight of the harvest harvested by the harvesting machine, weight indicated in kilograms on the ordinate of the graph of the figure 4 , the x-axis representing time in seconds.

[0092] This measurement signal is calculated by the measuring device based on a sum 400 of the signals 401 to 408 from the 8 load sensors C1 to C8 and indicating the weight of the harvest stored in the two storage bins 120 of the harvesting machine 100 of this embodiment.

[0093] It is of course possible to calculate the weight of the harvest stored in each of the storage bins separately by separately adding the signals from the sensors attached to each storage bin and thus arriving at two measurement signals, each representing in real time the weight of the harvest stored in one of the two storage bins.

[0094] The graph of the figure 4 shows that sensors C1 to C8 measure, in this example, weights close to each other, which causes the corresponding curves to be superimposed, the variations in measurements due for example to the movements of the harvesting machine on uneven ground not preventing reliable monitoring of the quantity of harvested grapes in real time with a quasi-linear variation in the overall weight of the grapes with the duration of the harvest, pauses in the harvest, and therefore in the evolution of the curves, occurring for example during a half-turn to move from one row of vines to the next as in 412.

[0095] Area 410 illustrates the information from the load sensors when the storage bins are tilted for emptying and then shows the inconsistencies of the signals in this phase, the sensors not being adapted to the measurement when the storage bin is pivoting.

[0096] However, important data on the value of the harvest content can be transmitted reliably and accurately during mechanical harvesting and before the storage bin is rotated.

[0097] Communication of the accumulated harvest weight can also be interrupted as soon as emptying is activated.

[0098] There figure 5 illustrates the measuring device 130, with an analog part 500A for analog signal processing, comprising the connection of the analog signals from the eight load sensors C1 to C8 to an amplifier 504 and an RC filter 506 via a multiplexer 502.

[0099] A digital part 500B of the measuring device comprises an analog-digital decoder 508 receiving the filtered signals coming from the RC filter, a microprocessor 510 controlling the multiplexer 502 and processing the digital signals generated by the decoder 508, and a bidirectional serial data bus 512 of the CAN (Control Area Network) type transmitting the processed digital signals to a human-machine interface 514 such as a computer terminal having computing capabilities and equipped with a touch screen, located in the cockpit.

[0100] Thus, the measuring device can communicate values ​​representative of the weight of the harvest accumulated in the bins at a given time to the control cabin, values ​​obtained by filtering and calculations on the raw data from the sensors.

[0101] Alternatively, these representative values ​​can be sent directly to the cellar, allowing collection operations to be anticipated, or the cellar can define a harvest weight target which will then define an alert signal sent to the machine during the harvest or communicated to the harvesting machine driver as soon as this harvest weight is close to being reached in the storage bins.

[0102] This is a differential measurement, taking into account only the variation of the sensor signals over time, so as to only take into account the weight of the stored harvest, ignoring the weight of the empty storage bin (in the case of a storage bin equipped with a sorting table, the weight of the sorting table can also be ignored).

[0103] The load signals generated by each of the sensors are added together by the microprocessor to obtain the overall weight of the harvest stored in the two storage bins.

[0104] The embodiment described above illustrates the situation of a grape harvester comprising two storage bins, but the invention of course extends to grape harvesters comprising a different number of storage bins, such as one, three or four for example, and it is understood that the sum of the sensor signals concerns all the sensors of the storage bins considered, a single bin where appropriate in the case of a grape harvester comprising only one.

[0105] It is also possible to associate the measurement data with an instantaneous position of the harvesting machine obtained by a satellite positioning system 516 connected to the interface 514, so as to establish a yield map of the vine during harvesting.

[0106] A 518 attitude measuring device connected to the 514 interface may also be used to make an attitude correction in the weight calculation to take into account slopes and cants.

[0107] We can also use a data communication device (GSM or other) communicating data bilaterally with the cellar for example.

[0108] The measuring device is here equipped with a conventional RC filter in the analog part of the circuit, but the filtration method is not limited to this example, the main thing being to limit dynamic disturbances due to the advance of the harvesting machine on uneven ground or to vibrations generated by the shaking assembly.

[0109] The load sensors are, in the present embodiment, bending load sensors, each set of load sensors being arranged so as to fulfill the two functions of (1) suspending a storage bin 120 from the corresponding bin chair 122 and (2) measuring the weight of this storage bin and its contents, and, where appropriate, the accessories with which it may be equipped such as for example a sorting table.

[0110] It is also possible to calibrate the sensors before each mechanical harvest by measuring the empty weight and then only provide the change in the weight of the harvest during the mechanical harvest.

[0111] As for the type of sensors, one can, for example, use flexural sensors of the SB14 type, produced by the manufacturer Flintec.

[0112] These sensors each measure a load in a single direction, that given by the longitudinal axis 133ax of the bolts 133 fixing the sensor, the direction is vertical in this embodiment.

[0113] In full configuration and with a sorting table, the total weight of a storage bin is around 2200 kg maximum.

[0114] In the present embodiment, four SB14 type 5000lb bending load sensors each having a measuring capacity varying between -2268 kg and +2268 kg are used to suspend each storage bin from the bin chair, leading to a measuring overcapacity factor greater than 4, this factor being evaluated by the ratio of the sum of the absolute values ​​of the capacities of the 4 load sensors to the maximum expected total weight, i.e. (2268x4) / 2200.

[0115] The total weight expected for a storage bin corresponds to the added weight of the element(s) forming the storage bin, the maximum weight of grapes being considered as equivalent to the weight of a volume of water equal to the internal volume of the storage bin, and, where applicable, of a sorting table fixed to the storage bin.

[0116] The measuring capacity of a sensor corresponds to the maximum load that it is capable of supporting and measuring according to the data from the sensor supplier.

[0117] The sensors, ensuring the mechanical connection between the storage bin and the bin chair, must in fact support the storage bin whatever the configuration, during the mechanical harvesting phase where they withstand all the vibrations and shocks caused by the shaking or the advancement of the machine on sometimes chaotic and uneven ground, but also during the emptying phase.

[0118] A first reason for the overcapacity of sensors is that this overcapacity is indicative not only of the limits in terms of measurement of the sensors, but also of their limits in terms of mechanical resistance.

[0119] Such overcapacity ensures the mechanical reliability of the suspension, taking into account the irregularity of the harvesting grounds and the vibrations and shocks caused by the various operations of the storage bin.

[0120] A second reason for the measurement overcapacity, by a factor greater than 4 in this embodiment (the set of 4 sensors is capable of measuring more than 4 times the maximum expected weight of the storage bin in use), is justified by the vibrations of the shaking system leading to disturbance of the measurement signals recorded by the load sensors.

[0121] A high overcapacity factor thus makes the load sensors less sensitive to vibrations and shocks, damping load peaks and allowing them to be corrected more easily by subsequent signal filtering.

[0122] Thus, the ratio of the sum of the absolute values ​​of the capacities of the load sensors to the maximum total expected weight of the storage bin is preferably greater than 2, more preferably greater than 3, even more preferably greater than 4.

[0123] It goes without saying that the present invention cannot be limited to the embodiment set out above, which may be subject to modifications without departing from the scope of the claims.

Claims

1. Harvesting machine (100) intended for harvesting grapes, including: - a chassis (116) mounted on at least one train (110) of wheels (110a) which are each movable about a wheel-train axle (110b), said chassis being arranged so as to straddle a row of vines during a mechanical harvest, - a vine-row shaker assembly (114) in mechanical connection with the chassis, capable of separating the grape harvest from the vine row, - an assembly (118) for collecting the harvest from the shaking assembly and conveying it to one or more storage bins (120), the storage bins each being attached to an associated bin seat (122) mounted pivotally around a bin pivot shaft (124) mechanically connected to the chassis to ensure emptying of the storage bins, and - a measuring device (130) for harvest weight accumulated in the storage bins, the harvesting machine being characterised in that: - each storage bin is connected to the associated bin seat via load sensors (132), the load sensors being elongate flexion sensors each including two attachment ends (132-1, 132-2), a first attachment end (132-1) being attached to the storage bin and a second attachment end (132-2) being attached to the associated bin seat (122) so that the storage bin (120) is suspended from the associated bin seat (122), - the fastening ends (132-1, 132-2) of the load sensors are disposed above the shaking assembly (114) when the machine is located on a horizontal flat floor, - each load sensor (132) is supplied by the harvest weight measuring device (130) to deliver a sensor signal (401 to 408) at any time during the mechanical harvest, and - the measuring device is configured to process the signals (401 to 408) of the load sensors and to continuously or cyclically deliver a measuring signal (400) representing a harvest weight accumulated by the harvesting machine in the storage bins.

2. Harvesting machine according to claim 1, wherein, for each storage bin, the attachment ends of the load sensors are disposed above a centre of gravity (150) of the storage bin when the machine is located on a horizontal flat floor.

3. Harvesting machine according to claim 1 or 2, wherein, for each storage bin, when the machine is located on a horizontal flat floor, the centre of gravity of the storage bin when empty is located at more than 15% of a depth (120d) of the storage bin under the fastening ends (132-1, 132-2).

4. Harvesting machine according to any one of claims 1 to 3, which comprises, for each storage bin, at least three load sensors (132) suspending the storage bin (120) from the bin seat (122), distributed so that two of these sensors are distant by at least 60% of the width (120w) of the storage bin in a direction substantially parallel to the wheel-train axle (110b), and so that two of these sensors are distant by at least 70% of a length (1201) of the storage bin in a substantially horizontal direction and perpendicular to the wheel-train axle, the storage bin being considered in the mechanical harvesting position on a horizontal level ground.

5. Harvesting machine according to claim 4, which comprises, for each storage bin, four load sensors (132) suspending the storage bin (120), a first and a second of these sensors being disposed at a front portion (121f) of the storage bin, and spaced apart from one another by at least 60% of the width (120w) of the storage bin in a direction substantially parallel to the wheel-train axle (110b), a third and a fourth of these load sensors being disposed at a rear portion (121r) of the storage bin and distant from one another by at least 60% of the width of the storage bin, the first and third of the load sensors being distant from one another by at least 70% of the length (1201) of the storage bin in a direction substantially horizontal and perpendicular to the wheel train axis, the storage bin being considered in the harvesting position on a horizontal level ground.

6. Harvesting machine according to any one of claims 1 to 5, wherein, for each storage bin, the storage bin includes rising edges (120a) of the bin, the first ends (132-1) for fastening the load sensors being fastened at less than 20% of a width (120w) of the storage bin from one of said bin rising edges.

7. Harvesting machine according to any one of claims 1 to 6, wherein, for each storage bin, at least one of the load sensors is located between the storage bin (120) and a control cab (112) of the harvesting machine and has a longitudinal axis (132ax) substantially parallel to the wheel-train axle (110b) of the harvesting machine.

8. Harvesting machine according to any one of claims 1 to 7, wherein, for each storage bin, a ratio of a sum of absolute values of the capacities of the load sensors to an expected maximum total weight of the storage bin is greater than 2.