阅读说明：本技术 用于农业喷射系统的回收板 (Recovery plate for agricultural spray system ) 是由 拉斐尔·蒙沙南 X·卢杰罗 J·科斯特斯 于 2021-05-27 设计创作，主要内容包括：本发明涉及一种回收板(10),其包括：-包括进气口的空气管道(13)；-回收盘(15),其包括回收开口,该回收开口至少部分地被过滤器格栅(19)占据,过滤器格栅被设计成将植物废料保留在过滤器格栅的上表面(20)上；-至少一个吹出口(21),其与该空气管道或另外的空气管道连通,并且设计成产生扫掠过滤器格栅的上表面的空气射流,以便吹扫保留在过滤器格栅的上表面上的植物废料。(The invention relates to a recovery plate (10) comprising: -an air duct (13) comprising an air inlet; -a recovery tray (15) comprising recovery openings at least partially occupied by a filter grid (19) designed to retain the plant waste on an upper surface (20) of the filter grid; -at least one blow-out opening (21) communicating with the air duct or with another air duct and designed to generate an air jet that is swept over the upper surface of the filter grid in order to sweep the plant waste material remaining on the upper surface of the filter grid.)

1. A recovery plate (10) for an agricultural spray system (200), the recovery plate (10) extending upwardly between a bottom (11) and a top (12) generally along a vertical direction (Z) and comprising:

-an air duct (13) comprising an air inlet (17), through which air duct (13) air is supplied through the air inlet (17),

-a recovery tray (15) forming the bottom (11) of the recovery plate (10) and comprising recovery openings (18), through which recovery tray (15) the excess sprayed treatment liquid on the plants to be treated is recovered, said recovery openings (18) extending around the entire vertical axis and being directed upwards, said recovery openings (18) being further occupied at least partially by a filter grid (19), said filter grid (19) being designed to allow the excess sprayed treatment liquid to circulate to the recovery tray (15) and to retain the plant waste on the upper surface (20) of said filter grid (19) vertically opposite to the recovery tray (15),

the recovery plate (10) is characterized in that it further comprises at least one blow-out opening (21) communicating with the air duct (13) or another air duct and designed to generate an air jet that sweeps the upper surface (20) of the filter grid (19) in order to purge the plant waste retained on the upper surface (20) of the filter grid (19).

2. A recovery plate (10) according to claim 1, wherein the upper surface (20) of the filter grille (19) is located below the blow-out opening (21) and is flush with the blow-out opening (21).

3. The recovery plate (10) according to claim 1 or claim 2, wherein the recovery opening (18) is delimited by an edge (22) comprising a first edge portion (23) and a second edge portion (24) parallel to each other, extending generally along a horizontal longitudinal direction (X), the first edge portion (23) being arranged facing the blow-out opening (21), the second edge portion (24) being free, wherein the filter grid (19) occupies the recovery opening (18) from the first edge portion (23) to the second edge portion (24) along a horizontal transverse direction (Y) perpendicular to the longitudinal direction (X), and wherein the blow-out opening (21) is designed to generate a generally transversely oriented air jet that sweeps across the upper surface (20) of the filter grid (19), so as to purge the plant waste retained by the upper surface (20) of the filter grid (19) from the first edge portion (23) of the recovery opening (18) to the free second edge portion (24) and thereby discharge the plant waste.

4. A recovery plate (10) according to claim 3, wherein the filter grate (19) comprises a first edge (25) and a second edge (26), said first edge (25) and said second edge (26) extending generally longitudinally parallel to each other and being transversely connected to each other by the upper surface (20), the first edge (25) of the filter grate (19) being arranged facing the first edge portion (23), the second edge (26) of the filter grate (19) being arranged facing the second edge portion (24), and wherein the blow-out openings (21) are distributed along the first edge (25) of the filter grate (19).

5. A recovery plate (10) according to claim 3 or claim 4, wherein the or each blow-out opening (21) extends about a generally transversely oriented blow-out axis (27).

6. A recovery plate (10) according to any of claims 1 to 5, comprising at least one spraying assembly (14) designed to spray a treatment liquid onto plants to be treated, the or each spraying assembly (14) comprising an air diffuser (16), said air diffuser (16) communicating with said air duct (13) and being designed to generate an air flow that carries or blows said treatment liquid onto said plants to be treated.

7. A recovery panel (10) according to claim 6, wherein the air duct (13) is formed at least partially inside a structural part (28) of the recovery panel (10), wherein the air duct (13) comprises a first air duct (38) and a second air duct (39), the first air duct (38) communicating on the one hand with the air inlet (17) and on the other hand with the air diffuser (16), the second air duct (39) communicating on the one hand with the air inlet (17) parallel to the first air duct (38) and on the other hand with the blow-out opening (21), the recovery panel (10) further comprising a shutter (47), the shutter (47) being movable with respect to the structural part (28) and arranged inside the air duct (13), the shutter (47) being further designed to selectively occupy a spraying position and a plant waste blowing-out position, in the spraying position, the shutter (47) releases the first air duct (38) and closes the second air duct (39) upstream of the blowing outlet (21), and in the plant waste blowing position, the shutter (47) closes the first air duct (38) and releases the second air duct (39) upstream of the spraying assembly (14).

8. A recovery plate (10) according to claim 7, wherein said shutter (47) comprises a flap (48), said flap (48) being pivotably mounted to said structural component (28) inside said air duct (13) about a pivot axis (49) between said spraying position and said plant blowing position.

9. A recovery plate (10) according to claim 7 or claim 8, comprising an actuator (50), said actuator (50) being designed to drive said shutter (47) movably with respect to said structural component (28) between said spraying position and said plant waste blowing position.

10. An agricultural spray system (200) for an agricultural machine (100), comprising at least one recovery plate (10) according to any one of claims 1 to 9.

11. An agricultural machine (100) comprising the agricultural spray system (200) of claim 10.

12. The agricultural machine (100) of claim 11, wherein the agricultural spray system (200) comprises at least one recovery plate (10) according to claim 9, the agricultural machine (100) comprising a control unit (102), the control unit (102) being designed to: commanding the actuator (50) to move the shutter (47) from the spraying position to the plant waste material blowing-out position and/or from the plant waste material blowing-out position to the spraying position.

13. The agricultural machine (100) of claim 12, wherein the control unit (102) is designed to: -commanding the actuator (50) to move the shutter (47) from the ejection position to the plant waste blowing position and/or from the plant waste blowing position to the ejection position when the control unit (102) receives a command sent by an operator through a user interface (103) connected to the control unit (102).

14. The agricultural machine (100) of claim 12 or 13, wherein the control unit (102) is designed to:

-detecting an operational anomaly of the shutter (47) and/or the actuator (50) of the or one of the recovery panels (10) by first detection means (104) mounted to the or each recovery panel (10), when the shutter (47) of the recovery panel (10) occupies neither the ejection position nor the plant waste blowing position, or when the shutter (47) of the recovery panel (10) occupies one of the ejection position and the plant waste blowing position, while the control unit (102) has commanded the actuator (50) of the recovery panel (10) to move the shutter (47) from one of the ejection position and the plant waste blowing position to the other of the ejection position and the plant waste blowing position, and

-sending an alarm to an operator through a user interface (103) connected to said control unit (102) when an operational anomaly of said shutter (47) and/or said actuator (50) of said recovery plate (10) is thus detected.

15. Agricultural machine (100) according to any one of claims 11 to 14, comprising a control unit (102) and a second plant waste detection device (105), the second plant waste detection device (105) being mounted to the recovery plate or to at least one of the recovery plates, the or each second plant waste detection device (105) being designed to send a detection signal to the control unit (102) when the second plant waste detection device (105) detects that plant waste remaining on the upper surface (20) of the filter grid (19) of the recovery plate (10) on which it is mounted (105) is at a height greater than or equal to a threshold height with respect to the upper surface (20) of the filter grid (19), the control unit (102) being designed to, -sending an alarm to an operator through a user interface (103) connected to the control unit (102) when the control unit (102) receives a detection signal from the second plant waste detection device (105).

Technical Field

The present invention relates to a recovery plate for an agricultural spraying system, in particular for a grape or tree growing spraying system, an agricultural spraying system comprising at least one such recovery plate and an agricultural machine comprising such an agricultural spraying system.

Background

There are some agricultural spraying systems for agricultural machines, in particular for viticulture or tree culture machines, which comprise two recovery plates arranged face to face.

These recovery plates comprise a plurality of spraying assemblies by means of which a treatment liquid, such as a plant protection product or a liquid manure, is sprayed onto the plants to be treated, which are arranged between two recovery plates facing each other. For this purpose, air diffusers are provided to generate an air flow which carries or blows the treatment liquid towards the plants to be treated.

Each of these recovery plates further comprises a recovery tray forming the bottom of the recovery plate and comprising upwardly directed recovery openings through which excess sprayed treatment liquid on the plants to be treated is recovered, in particular by the recovery plate facing it. In this way, the treatment liquid recovered by the recovery tray can be sucked up, for example, by a pump connected to the recovery tray via a suction circuit and sprayed again onto the plants to be treated.

However, when the treatment liquid is sprayed onto the plants to be treated, plant waste (e.g., leaf residue, caps, or twigs) may be torn off from the plants to be treated and accumulated in the recovery tray.

This accumulation of plant waste is problematic because it limits the volume of treatment liquid that can be recovered in the recovery tray, which may lead to overflow of the recovery tray. This may also hinder the suction of the recovered treatment liquid for re-spraying, which may also lead to overflow of the recovery tray.

In order to avoid these problems, it is known, for example, to provide a filter grid occupying the recovery openings on the recovery tray so as to recover plant waste on an upper surface opposite the recovery tray while the treatment liquid flows through the filter grid to the recovery tray, and to provide means for extracting such plant waste from the upper surface of the filter grid. These devices prevent the accumulation of plant waste on the filter grate, which would prevent the flow of treatment liquid to the recovery tray, but also cause the flow of particle-laden treatment liquid from the plant waste to the recovery tray, thus blocking the suction circuit to the pump.

However, these devices often require intervention by an operator, in particular by the farmer driving the agricultural machine, which means that the farmer must go out of the cab of the agricultural machine and be exposed to the recovered treatment liquid. The cab of the implement may then become contaminated with the treatment fluid. This situation is unacceptable to the health of the farmer.

Disclosure of Invention

To solve this problem, the invention provides a recovery plate comprising a recovery tray itself comprising a recovery opening occupied by a filter grid, and at least one blow-out opening designed to generate, in a position opposite to the recovery tray, an air jet that is swept over the upper surface of the filter grid to purge the plant waste retained by said upper surface of the filter grid.

More precisely, one object of the invention is a recovery plate for an agricultural spraying system, which generally extends upwards in a vertical direction between a bottom and a top and comprises:

an air duct comprising an air inlet through which air is supplied to the air duct,

a recovery tray forming a bottom of said recovery tray and comprising recovery openings through which excess sprayed treatment liquid on the plants to be treated is collected, said recovery openings extending around the entire vertical axis and being directed upwards, said recovery openings being further at least partially occupied by a filter grid designed to allow the excess sprayed treatment liquid to circulate into said recovery tray and to retain the plant waste on an upper surface of the filter grid vertically opposite the recovery tray,

-at least one blow-out opening communicating with the air duct or another air duct and designed to generate an air jet that sweeps the upper surface of the filter grid in order to purge the plant waste material retained on the upper surface of the filter grid.

According to alternative methods that may be used together or separately:

-the upper surface of the filter grille is located below the blow-out opening and is flush with the blow-out opening;

the recovery opening is delimited by an edge comprising a first edge portion and a second edge portion parallel to each other, extending generally in a horizontal longitudinal direction, the first edge portion being arranged facing the blow-out opening, the second edge portion being free,

-the filter grate occupies a recovery opening from the first edge portion to the second edge portion along a horizontal transverse direction perpendicular to the longitudinal direction,

-the blow-out opening is designed to generate a generally transversely directed air jet that sweeps the upper surface of the filter grid in order to sweep plant waste material retained by the upper surface of the filter grid from a first edge portion to a free second edge portion of the recovery opening and thereby discharge the plant waste material;

-the filter grid comprises a first edge and a second edge extending generally longitudinally parallel to each other and connected to each other transversely by the upper surface, the first edge of the filter grid being arranged facing the first edge portion and the second edge of the filter grid being arranged facing the second edge portion;

-the blow-out openings are distributed along a first edge of the filter grille;

-the or each blow-out opening extends about a generally transversely-oriented blow-out axis;

the recovery plate comprises at least one spraying assembly designed to spray a treatment liquid onto the plants to be treated,

-the or each spraying assembly comprises an air diffuser communicating with the air duct and designed to generate an air flow that carries or blows the treatment liquid onto the plants to be treated;

-the air duct is at least partially formed inside the structural part of the recovery panel,

the air duct comprises a first air duct communicating with the air inlet on the one hand and with the air diffuser on the other hand, and a second air duct communicating with the air inlet on the one hand parallel to the first air duct and with the air outlet on the other hand,

-the recovery plate further comprises a shutter movable with respect to the structural part and arranged inside the air duct, the shutter being further designed to selectively occupy a spraying position, in which it releases the first air duct and closes the second air duct upstream of the blowing outlet, and a plant waste blowing position, in which it closes the first air duct upstream of the spraying assembly and releases the second air duct;

-the shutter comprises a shutter which is pivotably mounted to the structural component inside the air duct about a pivot axis between the spraying position and the plant blowout position;

-the recovery plate comprises an actuator designed to drive a shutter movable with respect to said structural part between said spraying position and said plant waste blowing position.

Another object of the invention is an agricultural spraying system for agricultural machines comprising at least one recovery plate as described above.

A further object of the invention is an agricultural machine comprising an agricultural spraying system as described previously.

According to alternative methods that may be used together or separately:

-the agricultural machine comprises a control unit designed to control an actuator to move said shutter from said spraying position to said plant waste material blowing position and/or from said plant waste material blowing position to said spraying position;

-the control unit is designed to command the actuator to move the shutter from the ejection position to the plant waste material blowing position and/or from the plant waste material blowing position to the ejection position, when the control unit receives a command sent by an operator through a user interface connected to the control unit;

the control unit is designed to:

when the shutter of the recovery plate occupies neither the spraying position nor the plant-waste blowing position, or when the shutter of the recovery plate occupies one of the spraying position and the plant-waste blowing position, while the control unit has commanded the actuator of the recovery plate to move the shutter from one of the spraying position and the plant-waste blowing position to the other of the spraying position and the plant-waste blowing position, an operational anomaly of the shutter and/or the actuator of the or one of the recovery plates is detected by means of a first detection device mounted to the or each recovery plate; and is

o sending an alarm to an operator through a user interface connected to said control unit when an operational anomaly of the shutter and/or actuator of said recovery plate is thus detected;

-the agricultural machine comprises a control unit and a second plant waste detection device mounted to the recovery plate or to one of the recovery plates, the or each plant waste detection device being designed to send a detection signal to the control unit when the second plant waste detection device detects that plant waste remaining on the upper surface of the filter grid of the recovery plate to which the second plant waste detection device is mounted is at a height greater than or equal to a threshold height relative to the upper surface of the filter grid, the control unit being designed to send an alarm to an operator through a user interface connected to the control unit when the control unit receives the detection signal from the second plant waste detection device.

Drawings

Other aspects, objects, advantages and features of the present invention will become more apparent upon reading of the following detailed description of preferred embodiments, given by way of non-limiting example and with reference to the accompanying drawings.

Figure 1 is a perspective view of a recovery plate for an agricultural spraying system according to one embodiment of the present invention.

Figure 2 is a detailed view of the ejection face of the recovery plate shown in figure 1.

Figure 3 is a vertical and longitudinal section of the recovery plate shown in figure 1, with the shutter of the recovery plate occupying the injection position;

figure 4 is a vertical and longitudinal section of the recovery plate shown in figure 1, with the shutter of the recovery plate occupying the plant waste blowing position;

figure 5 is a detail of figure 3;

figure 6 is a schematic top view of an agricultural machine comprising a spraying system provided with a recovery plate as shown in figures 1 to 5.

Detailed Description

Fig. 1 to 5 show a recovery plate 10 for an agricultural spray system, in particular a viticulture or treetoculture spray system, according to one embodiment of the invention.

In the remainder of the present description, a global reference coordinate system is adopted, but not limited thereto, comprising a longitudinal direction X oriented from back to front in the advancement direction of the recovery plate 10, a transverse direction Y oriented from right to left, and a vertical direction Z oriented from bottom to top. The longitudinal X and transverse Y directions are horizontal and substantially parallel to the ground.

The recovery plate 10 extends generally upwardly in the vertical direction Z between a bottom 11 and a top 12 (fig. 1).

The recovery plate 10 further comprises an air duct 13 and a recovery tray 15 (fig. 1, 3, 4 and 5). The recovery plate 10 may also include at least one spray assembly 14.

The air duct 13 comprises an air inlet 17 through which air, in particular compressed air (fig. 1, 3 to 4), is supplied to the air duct 13. The air inlet 17 forms, for example, the top 12 of the recovery plate 10. The air inlet 17 may further extend around the entire vertical axis.

The or each spraying assembly 14 is designed to spray a treatment liquid onto the plants to be treated (fig. 1 and 2).

By "liquid" is meant that the product sprayed by the spray assembly includes a liquid phase. For example in the form of a solution or suspension. For example, it is a plant protection product or a liquid fertilizer.

The or each jetting assembly 14 may further comprise an air diffuser 16 in communication with the air duct 13 so as to be supplied with air through the air duct 13 (fig. 2). The air diffuser 16 thus forms a first air outlet from the air duct 13. The or each air diffuser 16 is also designed to generate an air flow that carries or blows the treatment liquid onto the plants to be treated.

The recovery tray 15 forms the bottom 11 of the recovery plate 10. The recovery tray 15 comprises a recovery opening 18 (fig. 1), through which recovery tray 15 the excess sprayed treatment liquid on the plants to be treated is recovered by the recovery tray 15, in particular by a further recovery plate 10, which further recovery plate 10 is arranged facing the recovery plate 10 in the transverse direction Y, as will be explained in more detail in the following description. To this end, the recovery opening 18 extends around the entire vertical axis and is oriented upwards.

The recovery opening 18 is further at least partially occupied by a filter grid 19, which filter grid 19 is designed to allow the circulation of surplus sprayed treatment liquid onto the recovery tray 15 and to retain plant waste, such as leaf residues, caps and even twigs, on an upper surface 20 of the filter grid 19, the upper surface 20 of the filter grid 19 being vertically opposite to the recovery tray 15 (fig. 2). The filter grid 19 thus makes it possible to separate the excess sprayed treatment liquid from the plant waste that has been torn off from the plant to be treated when sprayed. Thus, the treatment liquid is recovered in the recovery tray 15, while the plant waste is retained by the filter grid 19 and rests on the upper surface 20 of the filter grid 19.

The recovery plate 10 also comprises at least one blow-out port 21 communicating with the air duct 13 so as to be supplied with air through the air duct 13 (fig. 1 and 2). In this way, the air duct 13 supplies air from the air inlet 17 to the air outlet 21. The blow-out opening 21 may thus form an air outlet from the air duct 13 or a second air outlet from the air duct 13, wherein the air duct 13 also supplies air to the air diffuser 16.

The or each blow-out opening 21 is designed to generate an air jet that is swept across the upper surface 20 of the filter grid 19 to sweep plant waste material retained on the upper surface 20 of the filter grid 19.

In this way, the blow-out opening or openings 21 allow the plant waste to be collected in the same position on the upper surface 20 of the filter grate 19, so that frequent interventions by the operator, in particular by the farmer, are not required, either by discharging the plant waste from the upper surface 20 of the filter grate 19 or by directly discharging the plant waste from the upper surface 20 of the filter grate 19, so that intervention by the farmer is not required. This limits the farmer's access to the treatment liquid, which is more acceptable for his/her health.

As an alternative (not shown), the one or more blow-out openings 21 communicate with a further air duct, which is supplied with air, in particular compressed air, for example by means of a blower. The air duct 13 and the further air duct are supplied with air separately from each other. In other words, the air duct 13 and the further air duct are supplied with air from different sources, in particular from different blowers.

The upper surface 20 of the filter grille 19 is located, for example, below one or more blow-out openings 21 and is flush with the one or more blow-out openings 21, so that the air jet produced by the blow-out openings 21 sweeps the upper surface 20. By "flush", it is understood that the distance between the upper surface 20 of the filter grill 19 and the one or more blow-out openings 21 is small or zero, e.g., between 0 and 20mm, inclusive. However, it will be appreciated that the distance between the upper surface 20 of the filter grille 19 and the one or more blow-out openings 21 is more generally dependent on the profile of the air jet produced by the one or more blow-out openings 21. A more conical air jet profile will allow a greater distance between the upper surface 20 and the blow-out opening 21 to ensure sweeping of the upper surface 20. Conversely, a more cylindrical air jet profile will allow for a smaller distance between the upper surface 20 and one or more blow-out ports 21 to ensure sweeping of the upper surface 20.

The upper surface 20 of the filter grille 19 is, for example, flat, so that the air jet produced by the blow-out opening 21 sweeps the upper surface 20 (fig. 2). The blow-out axis 27 about which the or each blow-out opening 21 extends may be substantially coplanar with the upper surface 20 of the filter grille 19. Alternatively (not shown), the blow-out axis 27 of the blow-out port 21 is inclined downward toward the upper surface 20 of the filter grill 19.

The recovery opening 18 is delimited, for example, by an edge 22, which edge 22 comprises a first edge portion 23 and a second edge portion 24 (fig. 1) extending longitudinally, generally parallel to each other. The first edge portion 23 is arranged to face the blow-out port 21, while the second edge portion 24 is free. The filter grate 19 also occupies the recovery opening 18 laterally from the first edge portion 23 to the second edge portion 24.

To this end, the filter grille 19 comprises a first edge 25 and a second edge 26 (fig. 2), for example extending generally in a longitudinal direction, parallel to each other and connected to each other transversely by the upper surface 20. A first edge 25 of the filter grate 19 is arranged facing the first edge portion 23 and a second edge 26 of the filter grate 19 is arranged facing the second edge portion 24. The first edge 25 of the filter grate 19 may be vertically aligned with the first edge portion 23. The upper surface 20 of the filter grate 19 may optionally extend below a first edge portion 23, the first edge portion 23 being laterally interposed between a first edge 25 and a second edge 26 of the filter grate 19. The first edge 25 or the upper surface 20 of the filter grate 19 for example conforms to the shape of the first edge portion 23. The second edge 26 of the filter grate 19 conforms to or at least partially covers the second edge portion 24.

The blow-out opening 21 may further be designed to generate an overall transversely directed air jet sweeping the upper surface 20 of the filter grid 19 so as to blow out plant waste retained by the upper surface 20 of the filter grid 19 from the first edge portion 23 of the recovery opening 18 towards the free second edge portion 24, in particular towards the second edge 26 of the filter grid 19, thereby discharging plant waste from the filter grid 19 and the recovery plate 10.

To this end, the blow-out openings 21 may be distributed in a regular or irregular manner along the first edge 25 of the filter grille 19 (fig. 2). The blow-out openings 21 are distributed, for example, along the entire length of the first edge 25 of the filter grate 19, so that the air jet generated by the blow-out openings 21 sweeps the upper surface 20 of the filter grate 19 uniformly over the whole. "length" refers to the dimension of the first edge 25 of the filter grille 19 in the longitudinal direction X. The blow-out axis 27 about which the or each blow-out port 21 extends may lie in the entire vertical plane intersecting the longitudinal direction X. The or each blow-off axis 27 is for example comprised in the entire vertical and lateral plane. The or each blow-off axis 27 can also be oriented generally transversely or inclined downwardly towards the upper surface 20 of the filter grate 19. The entire vertical planes including the blow-out axis 27 may be parallel to each other, or alternatively intersect each other. Each vertical plane including the blowout axis 27 may further be at an angle equal to or different from an angle formed between one, a plurality of or the other vertical planes and the longitudinal direction X. For example, the vertical plane in which the blow-off axis 27 is included may be arranged in sectors, each sector radiating from a whole vertical straight line.

The upper surface 20 of the filter grate 19 is inclined downwards, for example with respect to the horizontal, from a first edge 25 towards a second edge 26 of the filter grate 19, to promote the discharge of the plant waste material, which is driven under its own weight in the direction towards the second edge 26 (fig. 2). The upper surface 20 of the filter grate 19 is inclined, for example, at an angle of 5 deg. or less with respect to the horizontal. Alternatively (not shown), the upper surface 20 of the filter grate 19 is substantially horizontal.

The or each blow-out opening 21 forms, for example, a slot extending generally in the longitudinal direction X. The length of each slot forming one of the blow-out ports 21 may be equal to the length of at least one other slot and/or different from the length of at least one other slot. The "length" refers to a dimension of the slot forming the blow-out port 21 along the longitudinal direction X.

The slot forming the blow-out opening 21 is defined, for example, by a first edge portion 23 of the recovery opening 18, said first edge portion 23 having, for example, one or more notches for this purpose, which may be in the form of a saw-tooth, and is defined by a first edge 25 of the filter grate 19 or by the upper surface 20 of the filter grate 19. As an alternative (not shown), the slot or slots forming the blow-out port or ports 21 are defined by grooves, for example machined in the structural part 28 of the recovery plate.

As an alternative (not shown), the or each blow-out opening 21 has a cross-section, for example taken perpendicular to a blow-out axis 27 about which the blow-out opening 21 extends, which cross-section has a circular shape (fig. 2). Other shapes, such as rectangular, may of course be provided.

The filter grid 19 may be in the form of a perforated wall (fig. 2) or a lattice.

The filter grate 19 can also be mounted pivotably about a pivot axis 29 on a structural part 28 of the recovery plate 10 between a closed position, in which this filter grate 19 at least partially occupies the recovery openings 18, and a release position, in which the filter grate 19 releases the recovery openings 18 so as to have free access to the recovery tray 15, in particular for cleaning the recovery tray 15 (fig. 2). Of course, in the above description, the filter grille 19 is described as being in the closed position. The pivot axis 29 is, for example, generally longitudinally oriented. The filter grille 19 can also be pivotably mounted by its second edge 26 to a structural part 28.

As an alternative (not shown), the filter grate 19 is reversibly mounted to the structural part 28 of the recovery plate 10. The filter grate 19 is therefore removable, allowing free access to the recovery tray 15, in particular for cleaning the recovery tray.

The recovery plate 10 may further comprise a recovery wall 30, the recovery wall 30 extending generally transversely from the second edge portion 24 of the recovery opening 18 in a direction opposite to the first edge portion 23 of the recovery opening 18 (fig. 1 and 2). The recovery wall 30 also has an upper surface 31, which upper surface 31 is arranged as an extension of the upper surface 20 of the filter grid 19 or the second edge portion 23 of the recovery opening 18 and the upper surface 20 of the filter grid 19 and is inclined upwards from the second edge portion 24 from the horizontal direction to promote the flow of the treatment liquid recovered from the recovery wall 30 to the filter grid 19. The upper surface 31 of the recovery wall 30 is, for example, flat. The upper surface 31 of the recovery wall 30 may be inclined to the horizontal at an angle of less than or equal to 20 °, in particular less than or equal to 15 °.

The air duct 13 is at least partially formed inside the structural part 28 of the recovery plate 10.

The air duct 13 can be supplied with air by means of a tangential centrifugal fan, which is in turn mounted to the structural part 28 of the recovery plate 10, in particular so as to blow air in the transverse direction Y towards the blow-out opening 21.

Where appropriate, further air ducts may be formed at least partially inside the structural part 28 of the recovery plate 10. When further air ducts are formed inside the structural part 28 of the recovery plate 10, they can then be supplied with air by means of a tangential centrifugal fan, which is itself mounted on the structural part 28 of the recovery plate 10, in particular for blowing air in the transverse direction Y towards the blow-out opening 21. Additional air ducts may also be assembled to the structural components 28 of the recovery plate 10.

The structural part 28 is formed, for example, by several parts which are mounted integrally with one another and together define the air duct 13. Alternatively, the structural component 28 of the recovery plate 10 is formed by a box, integral or single-piece, inside which the air duct 13 is formed.

One or more blow-out ports 21 may be formed directly in the structural member 28 of the recovery plate 10.

One or more openings 32 may be provided in the structural component 28 of the recovery plate 10, said openings 32 communicating with the air duct 13 to accommodate the jetting assembly 14, in particular the air diffuser 16, and then assembling the jetting assembly 14 to the structural component 28 (fig. 3 and 4).

The recovery discs 15 may be assembled to the structural members 28 of the recovery plate 10. The recovery tray 15 can be further removed from the structural part 28 of the recovery plate 10 to facilitate cleaning thereof. Alternatively, the recovery tray 15 is formed in a single piece with the structural part 28, with one of the parts of said structural part 28 or with the box.

The recovery plate 10 may have two faces 33, 34 opposite each other in the transverse direction Y, each of these faces 33, 34 defining a transverse side of the recovery plate 10 (fig. 1). One of these faces 33, 34, called the ejection face, is arranged in particular facing the ejection face of the other recovery plate 10. In the following description, the lateral side of the recovery plate 10 defined by the ejection face 33 will be referred to as "ejection side".

The spray assembly 14, the recovery opening 18, the filter grate 19 and the blow-out opening 21 are arranged, for example, on the same lateral side of the recovery plate 10, in particular on the spray side.

The recovery plate 10 can also comprise fins 35, in particular on the spraying side, which are generally vertical and parallel to each other and are distributed uniformly or non-uniformly along the longitudinal direction X, so as to catch the excess drops of sprayed treatment liquid and direct them towards the recovery tray 15 (fig. 1).

The fins 35 are, for example, mounted to the structural members 28 of the recovery plates 10.

The fins 35 define between them, for example, openings 36 to open into the internal volume 37 of the recovery plate 10, which openings 36 are separated from the air ducts 13 (fig. 3). These openings 36 allow the passage of air carrying the excess droplets of ejected treatment liquid after these droplets have been separated from the air carrying the droplets that is in contact with the fins 35. For example, the internal volume 37 is delimited by the fins 35 along the transverse direction Y, in particular on the ejection side, and by the side walls (not shown) of the recovery plates 10, in particular on the side opposite to the ejection side. The inner volume 37 may also be delimited in the longitudinal direction X and the vertical direction Z by the air duct 13, thereby enclosing the inner volume 37.

The air duct 13 comprises, for example, a first air duct 38 communicating on the one hand with the air inlet 17 and on the other hand with the air diffuser 16, in particular through the opening 32 of the structural component 28 (fig. 3 and 4). Thus, the first air duct 38 supplies air from the air inlet 17 to the air diffuser 16. Thus, air is circulated from the air intake 17 to the injection assembly 14 from upstream to downstream along the first air duct 38. A first air duct 38 is formed in the structural part 28 of the recovery plate 10.

The air duct 13 also comprises a second air duct 39 communicating on the one hand with the air inlet 17, parallel to the first air duct 38, and on the other hand with the air outlet 21 (fig. 3 and 4). In this way, the second air duct 39 supplies air from the air inlet 17 to the air outlet 21. Therefore, the air circulates from the air inlet 17 to the air outlet 21 from upstream to downstream along the second air duct 39. The second air duct 39 may be formed in the structural part 28 of the recovery plate 10. As an alternative (not shown), the second air duct 39 is formed partly in the structural component 28, in particular at the common portion 40, and partly by a flexible duct assembled to the rigid structural component 28. Then, one or more blow-out ports 21 may be formed at the outlet of the flexible duct.

First and second air ducts 38, 39 include a common portion 40 that extends, for example, from air inlet 17 to a bifurcation 41 where first and second air ducts 38, 39 diverge from one another toward jetting assembly 14 and one or more blow-off ports 21. The first air duct 38 and the second air duct 39 may be generally divided in the longitudinal direction at the bifurcation 41 so as to be offset from each other in the longitudinal direction downstream of the bifurcation 41.

The first air duct 38 includes, for example, downstream of the branch 41, a first portion 42 extending integrally from the branch 41 generally longitudinally, in particular forwardly, and a second portion 43 extending as an extension of the first portion 42 and extending integrally vertically downward from the first portion 42. The plurality of jetting assemblies 14 may be uniformly or non-uniformly distributed vertically throughout along the second portion 43 of the first air duct 38.

The second air duct 39 comprises, for example downstream of the bifurcation 41, a first portion 44 extending generally longitudinally, in particular integrally rearwardly, from the bifurcation 41, a second portion 45 extending as an extension of the first portion 44 and extending generally vertically downwardly, and a third portion 46 extending as an extension of the second portion 45 and extending generally longitudinally forwardly, in particular from the second portion 45. Thus, the first and third portions 44, 46 are separated from each other in the vertical direction by the second portion 45. The blow-out openings 21 may also be uniformly or non-uniformly distributed longitudinally along the entirety of the third portion 46 of the second air duct 39.

The first 42 and second 43 portions of the first air duct 38 and the first 44, second 45 and third 46 portions of the second air duct 39 together define, for example, a frame longitudinally and vertically delimiting the internal volume 37 of the recovery plate 10.

The recovery plate 10 may further comprise a shutter 47 (fig. 3 to 5) movable with respect to the structural part 28 of the recovery plate 10 and arranged inside the air duct 13.

The shutter 47 is also designed to selectively occupy a spraying position, in which the shutter 47 releases the first air duct 38 and closes the second air duct 39 upstream of the blow-out opening 21, and a plant waste blowing-out position, in which the shutter 47 closes the first air duct 38 upstream of the spraying assembly 14 and releases the second air duct 39.

Thus, in the injection position, the shutter 47 allows air to flow from the air intake opening 17 to the injection assembly 14 via the first air duct 38, and prevents air from flowing from the air intake opening 17 to the air outlet 21 via the second air duct 39. In contrast, in the plant waste blowout position, the shutter 47 allows air to circulate from the air inlet 17 to the air outlet 21 via the second air duct 39, and prevents air from flowing from the air inlet 17 to the jetting assembly 14 via the first air duct 38.

Therefore, the air duct 13 cannot supply air to the air diffuser 16 and the blow-out port 21 at the same time. This avoids the air jets created by the blow-off ports 21 sweeping over the upper surface 20 of the filter grate 19 from preventing excess sprayed treatment liquid from passing through the filter grate 19 and thus reaching the recovery tray 15.

The shutter 47 comprises, for example, a shutter 48, which shutter 48 is pivotably mounted to the structural part 28 of the recovery plate 10 about a pivot axis 49 within the air duct 13 between a spraying position and a plant blowing position (fig. 3 to 5). The pivot axis 49 may be generally transversely oriented.

The flap 48 may further be pivotally mounted within the air duct 13 at the bifurcation 41.

Alternatively (not shown), the shutter 47 comprises a spool slidably mounted along a sliding axis with respect to the structural member 28 of the recovery plate 28. The spool also comprises a groove extending around the sliding axis and designed to selectively communicate the air inlet 17 with the first air duct 38 when the shutter 37 occupies the injection position and to selectively communicate the air inlet 17 with the second air duct 39 when the shutter 37 occupies the plant waste blowing position.

Thus, the valve 47 functions as a spool valve to selectively supply air to the first and second air ducts 37, 38.

The recovery plate 10 further comprises, for example, an actuator 50, which actuator 50 is designed to movably drive the shutter 47, in particular to pivotably drive the flap 48, between the spraying position and the plant waste blowing position, relative to the structural part 28 of the recovery plate 10. (FIG. 5).

The actuator 50 comprises, for example, a jack 51, the jack 51 in turn comprising a cylinder 52, in which cylinder 52 a rod 53 is designed to slide between a retracted position and an extended position in which one end of the rod 53 is further away from the cylinder than in the retracted position. One of the ends of the cylinder 52 and the rod 53 is mounted on the structural member 28 of the recovery plate 10, and the other of the ends of the cylinder 52 and the rod 53 is mounted on the shutter 47, particularly on the baffle 48.

When the jack 51 occupies one of the retracted position and the extended position, the shutter 47 occupies the ejection position. When the jack occupies the other of the retracted position and the extended position, the shutter 47 occupies the plant waste blowout position.

Alternatively (not shown), the actuator 50 comprises an electric motor coupled to a gear motor, itself coupled to a pinion carried by the pivot axis 49 of the shutter 48, or to a worm or even a rack carried by or formed on the valve spool.

As an alternative (not shown), the actuator 50 comprises a magnet electromagnetic actuator designed to movably drive the shutter 47, when supplied with electric power by the power supply, from one of the spraying position and the plant-waste blowing position to the other of the spraying position and the plant-waste blowing position, and in particular to movably pivot the shutter 48 from one of the spraying position and the plant-waste blowing position to the other of the spraying position and the plant-waste blowing position, with respect to the structural component 28 of the recovery plate 10. The elastic return member may be further designed to move the shutter 47 back to move from the other of the jetting position and the plant-waste blowing position to one of the jetting position and the plant-waste blowing position. Therefore, when the magnet electromagnetic actuator is not supplied with electric power, the shutter 47 is moved to one of the ejection position and the plant waste blowout position. To this end, elastic return members may be mounted in particular between the baffles 47 and the structural components 28 of the recovery plates 10. The resilient return member is formed, for example, by a spring.

An actuator 50, in particular a jack 51, may be mounted in the second air duct 39, so as to limit the overall dimensions of the recovery plate 10, and also to protect the actuator 50. If applicable, when the jack 51 occupies the extended position, the shutter 47 occupies the plant waste blowing position, and when the jack 51 occupies the retracted position, the shutter 47 occupies the ejection position.

The actuator 50 is, for example, electrically driven, and the jack 51 is, in particular, electrically driven. Alternatively, the actuator 50 is driven pneumatically or hydraulically, in particular the jack 51 is pneumatic or hydraulic.

The or each air diffuser 16 comprises, for example, a body 54, by means of which body 54 the air diffuser 16 is mounted to the structural part 28 of the recovery plate 10, in particular via the openings 32 of said structural part 28 (fig. 2). The or each air diffuser 16 is also in communication with the air duct 13 via air diffuser openings 55 provided in the main body 54.

The or each spray assembly 14 further comprises, for example, a nozzle 56, which nozzle 56 is mounted to the main body 54 of the air diffuser 16 and is supplied with pressurised process fluid by a supply circuit (not shown) (fig. 2). The nozzle 56 is juxtaposed with the air diffusion opening 55. The nozzles 56 are also designed to spray pressurized treatment liquid, which is carried along by the air flow generated by the air diffuser 16 to be sprayed onto the plants to be treated.

Alternatively (not shown), the or each jetting assembly 14 comprises a sprinkler mounted to the body 54 of the air diffuser 16 so as to be arranged across the air diffusing opening 55. The sprinkler further includes: an inlet through which the sprayer is fed with the treatment liquid from the feed circuit, a treatment liquid outlet, and one or two fins designed to disperse the treatment liquid coming out of the outlet in the air flow generated by the air diffuser 16.

The recovery tray 15 comprises, for example, a bottom (not shown) which closes the recovery tray 15 downwards and from which the recovery opening 18 is generally opposite along the vertical direction Z, and at least one side wall (not shown) extends upwards from the bottom towards the recovery opening 18. The one or more side walls and the bottom and the filter grate 19 together define an interior volume of the recovery tray 15. Thus, the upper surface 20 and the blow-out port 21 of the filter grille 19 are located outside the recovery tray 15, while the lower surface of the filter grille 19 opposite the upper surface 20 defines the internal volume of the recovery tray 15.

One or more discharge openings (not shown) may further be provided on the bottom wall and/or the side walls of the recovery tray 15 for sucking the treatment liquid collected in the recovery tray 15 and/or emptying the recovery tray 15.

Fig. 6 shows an agricultural machine 100, for example a tractor, comprising an agricultural spraying system 200, which agricultural spraying system 200 is provided with at least one recovery plate 10 as described above.

The agricultural spraying system 200 is in particular in contact with the ground by means of a wheel 101, in particular the wheel 101 of the agricultural machine 100, by means of which wheel 101 the agricultural spraying system 200 advances in the longitudinal direction X in the field of plants V to be treated.

The agricultural spray system 200 is carried by the agricultural machine 100. Alternatively, the agricultural spray system 200 is towed by, for example, the agricultural machine 100. Still alternatively, the agricultural spray system 200 is self-propelled, thereby forming the agricultural machine 100.

Agricultural spray system 200 includes, for example, a generally transversely oriented spray bar 201 with at least one recovery plate 10 suspended from spray bar 201. The recovery plates 10 are arranged, for example, in pairs, with the plants V to be treated being interposed transversely between each of said pairs. The ejection faces 33 of each pair of recovery plates 10 are arranged in particular opposite one another.

The agricultural spray system 200 may further comprise a pneumatic circuit (not shown) connected to the air inlet 17 and comprising a blower for supplying air, in particular pressurized air, to the air duct 13. The blower supplying the air duct 13 may also be mounted directly at the air inlet 17 of the air duct 13, so that no pneumatic circuit is required to supply the air duct 13.

Alternatively (not shown), the agricultural spray system 200 includes two separate pneumatic circuits, one connected to the air inlet 17 and the air conduit 13, and the other connected to another air conduit. Each pneumatic circuit comprises a blower for supplying air to the air duct 13 and to the further air duct. The blower supplying the further air duct may also be mounted directly in the further air duct, so that no pneumatic circuit is required for supplying the further air duct. The blower supplying the air duct 13 may itself be mounted directly at the air inlet 17 of the air duct 13, so that no air circuit is required to supply the air duct 13.

The agricultural spray system 200 may further include: a tank 202 for containing a treatment liquid; and a treatment liquid supply circuit (not shown) connected on the one hand to the tank 202 and on the other hand to the supply circuit of the recovery plate 10 and comprising a pump to supply the treatment liquid to the spray assembly 14.

The agricultural machine 100 may also comprise an electronic control unit 102, the electronic control unit 102 being designed to drive the actuator 50, in particular the jack 51. The control unit 102 may drive the actuator 50 directly, particularly when the actuator 50 is electrically driven, or indirectly via a pneumatic or hydraulic circuit or power source, which is then driven by the control unit 102 and drives the implement 50.

The agricultural machine 100 may further comprise a user interface 103, which user interface 103 is connected to the control unit 102 and by means of which the farmer communicates with the control unit 102, the control unit 102 being designed to control the actuator 50 to move the shutter 47 from the spraying position to the plant waste material blowing position and vice versa, in particular to pivot the flap 48 from the spraying position to the plant waste material blowing position and vice versa, when the control unit 102 receives a command sent by the farmer via the user interface 103.

The control unit 102 may also be designed to control the stopping of the spraying, in particular the supply of treatment liquid and air to the spraying assembly 14, and, if applicable, the movement of the spray bar 201 and/or the recovery plate 10 relative to the chassis of the agricultural machine 100 to the folded position, and to command the actuator 50 to move the shutter 47 from the spraying position to the plant waste blowing position, in particular to pivot the flap 48 from the spraying position to the plant waste blowing position, when the control unit 102 receives a command sent by the farmer via the user interface 103. Therefore, when the farmer stops spraying, particularly when the row tail of the plant V makes a U-turn to replace the row of the plant V to be treated, the shutter 47 is automatically moved to the plant waste blowing position. In other words, by a single command, the farmer controls to stop the spraying and move the shutter 47 to the plant waste blowing position.

Likewise, the control unit 102 may be designed to control the resumption of the spraying, in particular the supply of treatment liquid and air to the spraying assembly 14, and, if applicable, the movement of the spray bar 201 and/or the recovery plate 10 to the extended position with respect to the chassis of the agricultural machine 100, and the command of the actuator 50 to move the shutter 47 from the plant waste blowing position to the spraying position, in particular to pivot the flap 48 from the plant waste blowing position to the spraying position, when the control unit 102 receives a command sent by the farmer via the user interface 103. Therefore, when the farmer restarts spraying, especially after making a U-turn to replace the row of plants V to be treated, the shutter 47 is automatically moved to the spraying position. In other words, with a single command, the farmer controls to resume spraying and move the shutter plate 47 to the spraying position.

Of course, the farmer may also control the movement of the shutter 47 via the user interface 103 and the control unit 102, irrespective of whether the spraying is stopped or started. This is the case, for example, when it is necessary to eject a row of plants V to be treated, i.e. before the next U-turn to replace the row of plants V to be treated, it is necessary to discharge the plant waste remaining on the filter grid 19.

For example, the control unit 102 is also designed to control the actuator 50 to move the shutter 47 from the plant-waste blowing position to the spraying position when a predetermined purge time period has elapsed since a farmer sent a command to the control unit 102 via the user interface 103 to cause the actuator 50 to move the shutter 47 from the spraying position to the plant-waste blowing position or to cause the shutter 47 to occupy the plant-waste blowing position. Thus, the control unit 102 performs timeout. To this end, the agricultural machine 100 comprises, for example, a timer, for example a clock, connected to the control unit 102.

The control unit 102 may also be designed to:

when the shutter 47 of the recovery plate 10 occupies neither the spraying position nor the plant waste blowing position, the first air duct 38 and the second air duct 39 of the recovery plate 10 are both supplied with air, or the shutter 47 of the recovery plate 10 occupies one of the spraying position and the plant waste blowing position, and the control unit 102 has commanded the actuator 50 to move the shutter 47 from one of the jetting position and the plant-waste blowing position to the other of the jetting position and the plant-waste blowing position, an operational abnormality of the shutter 47 and/or the actuator 50 of the or one recovery panel 10 is detected by the first detecting means 104 mounted on the or each recovery panel 10, and-when thus an operational anomaly of the shutter 47 and/or the actuator 50 of said recovery panel 10 is detected, an alarm is sent to the farmer via the user interface 103.

The or each first detection means 104 is for example designed to detect the position of the shutter 47 of the recovery plate 10 on which it is mounted and to send this position to the control unit 102, the control unit 102 being designed to command the actuator 50 to move the shutter 47 from one of the spraying position and the plant waste blowing position to the other one of the spraying position and the plant waste blowing position, the control unit 102 having sent an alarm to the farmer via the user interface 103, when the position of the shutter 47 detected by the first detection means 104 is neither the spraying position nor the plant waste blowing position, or the first detection means 104 detects that the shutter 47 occupies one of the spraying position and the plant waste blowing position.

The or each first detection means 104 is designed, for example, to send a detection signal to the control unit 102 when the shutter 47 of the recovery plate 10 on which it is mounted occupies the ejection position or the plant waste blowing position. Therefore, when the first detection device 104 does not send the detection signal, since the shutter 47 is neither in the ejection position nor in the plant waste blowing-out position, both the first air duct 38 and the second air duct 39 are supplied with air. Then, the control unit 102 is designed such that when said first detecting means 104 or one of said first detecting means 104 does not send a detection signal or sends a detection signal opposite to the command to the operator 50, the shutter 47 occupies one of the spraying position and the plant waste blowing position, while the control unit 102 has commanded the actuator 50 to move the shutter 47 from one of the spraying position and the plant waste blowing position to the other of the spraying position and the plant waste blowing position, sending an alarm to the farmer via the user interface 103.

The or each first detection means 104 comprises, for example, a pair of induction sensors, one of which is arranged to send a detection signal to the control unit 102 when the shutter 47 of the recovery plate 10 on which the first detection means 104 is mounted occupies the spraying position, and the other of which is arranged to send a detection signal to the control unit 102 when the shutter 47 occupies the plant-waste blowing-out position. To this end, the shutter 47 of the or each recovery plate 10 has at least one metal surface or portion arranged to face one of the inductive sensors when the shutter 47 occupies the spraying position and to face the other of the inductive sensors when the shutter 47 occupies the plant waste blowoff position.

Alternatively, the or each first detection means 104 comprises a pair of switches, the shutter 47 of the recovery plate 10 on which the first detection means 104 are mounted being designed to close one of the switches, in particular by means of a push button, when the shutter 47 occupies the spraying position, and to close the other switch, in particular by means of another push button, when the shutter 47 occupies the plant waste blowing position. Each switch is also designed to send a detection signal to the control unit 102 when closed.

Still alternatively (not shown), the first detection means 104 comprise a potentiometer integral with the shutter 48 of the shutter 47 mounted thereon. The potentiometer is also designed to send a signal value to the control unit 102 when the shutter 47 occupies the ejection position, which signal value is equal to the first signal value, and to send a second signal value different from the first signal value when the shutter 47 occupies the plant-waste blowing position. Then, the control unit 102 is designed to: the signal value received from the potentiometer is compared with the first signal value and the second signal value, and when the received signal value differs from the first signal value and the second signal value or when there is a discrepancy between the received signal value and the command to the actuator 50, the shutter 47 occupies one of the ejection position and the plant-waste blowing position, while the control unit 102 has commanded the actuator 50 to move the shutter 47 from one of the ejection position and the plant-waste blowing position to the other of the ejection position and the plant-waste blowing position, sending an alarm to the farmer through the user interface 103.

As a still alternative (not shown), the or each first detection device 104 comprises a pair of pressure sensors, one of which is arranged in the first air duct 38 of the recovery plate 10 on which it is mounted, the other pressure sensor being arranged in the second air duct 39 of said recovery plate 10. The pressure sensors are also designed to measure the pressure in the first air duct 38 and the second air duct 39, respectively, and to send these measured pressures to the control unit 102. The control unit 102 is then designed to compare each of these measured pressures with a predetermined threshold pressure and, when both pressures exceed the threshold pressure, both the first air duct 38 and the second air duct 39 are supplied with air or there is a discrepancy between the fact that one of the two measured pressures is greater than the threshold pressure and the command of the actuator 50, the pressure measured in one of the first air duct 38 and the second air duct 39 being greater than the threshold pressure, while the control unit 102 has commanded the actuator 50 to move the shutter 47 so as to supply band air to the other of the first and second air ducts 38, 39, sending an alarm to the farmer through the user interface 103.

As an alternative (not shown), a visual indicator is carried by the shutter 47 of the or each recovery plate 10 outside the air duct 13. The visual indicator is for example movably integrated with the shutter 48 of the shutter 47 and protrudes from the air duct 13. The visual indicator makes the farmer aware of the position of the shutter 47 in order to determine possible anomalies of the shutter 47 and/or of the actuator 50, in particular when the visual indicator indicates that the shutter 47 occupies an intermediate position between the spraying position and the plant waste blowing position, or that the visual indicator indicates that the shutter 47 occupies one of the spraying position and the plant waste blowing position, while the farmer sends a command to the control unit 102 through the user interface 103 to command the actuator 50 to move the shutter 47 from one of the spraying position and the plant waste blowing position to the other of the spraying position and the plant waste blowing position.

The agricultural machine 100 further comprises, for example, a second plant waste detection device 105, the second plant waste detection device 105 being mounted to the recovery plate 10 or at least one recovery plate 10. The second plant waste detection apparatus 105 is designed to: when the second plant waste detection apparatus 105 detects that the height of the plant waste remaining on the upper surface 20 of the filter grill 19 of the recovery plate 10 mounted with the second plant waste detection apparatus 105 measured with respect to the upper surface 20 of the filter grill 19 is greater than or equal to a predetermined threshold height, a detection signal is sent to the control unit 102. "height" refers to the dimension in the vertical direction Z.

The control unit 102 is further designed to send an alarm to the farmer via the user interface 103 when the control unit 102 receives a detection signal from the second plant waste detection device 105. The control unit 102 is, for example, designed to send an alarm to the farmer via the user interface 103 when the control unit 102 receives a detection signal from the second plant waste detection device 105 within a predetermined period of time. To this end, the agricultural machine 100 comprises, for example, a timer, such as a clock, connected to the control unit 102. The farmer can then send a command to the control unit 102 via the user interface 103 to command the actuator 50 to move the shutter 47 from the spraying position to the plant waste blowing position, in particular to pivot the flap 48 from the spraying position to the plant waste blowing position. The or each second plant waste detection device 105 may be an infrared detector mounted on the recovery plate 10 above the filter grid 19.

The above-described recovery plate 10, agricultural spray system 200 and agricultural machine 100 are particularly advantageous in that they enable the generation of air jets that purge the plant waste recovered from the filter grate 19, so as to discharge it with little or no manual intervention by the farmer at the filter grate 19.