Closing device and extraction device for phytosanitary product

Abstract

The present invention relates to a closing device (3) intended to close a container (2) of phytosanitary product, the closing device (3) comprising a bottom wall (30) having at least three through openings, and a peripheral wall (31) projecting from the bottom wall (30), a first opening (33) being configured to be connected to a phytosanitary product outlet (5) allowing said phytosanitary product to be evacuated from said container (2), a second opening (34) being configured to open in a sealed manner into an inflatable membrane (36) and to be connected to an inlet of a pneumatic circuit (4), so as to allow an overpressure to be generated in the container (2) by the expansion of the inflatable membrane (36) by means of the pneumatic circuit (4), a third opening (35) being configured to be connected to an inlet of a hydraulic rinsing circuit (6). Abstract figure: Figure 1

Description

Title of the invention: Closing device and device for extracting phytosanitary products Technical field

[0001] The present invention relates to the field of agricultural spraying.

[0002] In particular, the present invention relates to a closing device intended to cooperate with a container of phytosanitary product for an agricultural sprayer.

[0003] The invention also relates to a device for extracting a phytosanitary product comprising such a closing device.

[0004] The invention also relates to an agricultural machine comprising such an extraction device. STATE OF THE ART

[0005] Methods for spraying liquid under pressure, in particular agricultural plant protection products, and apparatuses intended for such spraying are known. In particular, in such apparatuses, a constant pressure of water or air is applied to an expandable membrane which swells and tends to fit the internal contour of a container in which the liquid to be sprayed is contained so as to cause the ejection thereof. The liquid to be sprayed is directed, by the swelling of the membrane, towards a conduit for discharging the liquid to be sprayed. More specifically, according to the state of the art, for correct discharge of the liquid to be sprayed, the injection of air so that the membrane swells is carried out on one side of the container and the discharge of the liquid to be sprayed is carried out on the opposite side of said container.In fact, when the membrane inflates on one side of the container, it will push the liquid from the opposite side of the container towards the evacuation pipe and therefore allow it to be evacuated through said pipe.

[0006] However, such devices with this type of spraying require a particular container containing the liquid to be sprayed, an arrangement of a water or air inlet and an outlet for the liquid to be sprayed on two opposite sides. Thus, the container is specific to the device and the latter is bulky.

[0007] The present invention therefore aims to solve the aforementioned problems by proposing a closing device intended to cooperate with a container of phytosanitary product and configured to facilitate and allow the evacuation of a phytosanitary product. Said device being adaptable to different standard containers, it is convenient and economical, but also allows a certain ergonomics of the agricultural spraying system for which the closing device is intended. PRESENTATION OF THE INVENTION

[0008] More specifically, the invention relates to a closing device intended to cooperate with a hydraulic rinsing circuit, with a pneumatic circuit for an agricultural spraying system, with a phytosanitary product outlet and with a phytosanitary product container, the closing device comprising at least one bottom wall and at least one peripheral wall. The closing device is intended to close the container.The peripheral wall projecting from the bottom wall, the bottom wall has at least three through openings, namely a first opening, a second opening and a third opening, the first opening being configured to be connected to the phytosanitary product outlet allowing said phytosanitary product to be evacuated from said container, the second opening being on the one hand configured to open in a sealed manner into an inflatable membrane and on the other hand configured to be connected to an inlet of the pneumatic circuit, so as to allow overpressure to be generated in the container by the expansion of the inflatable membrane by means of the pneumatic circuit, said third opening being configured to be connected to an inlet of said hydraulic rinsing circuit.

[0009] The closure device according to the invention may be single-use or reusable. It allows, through its first opening, the evacuation of the phytosanitary product contained in the container to which it is fixed. Through its second opening, the closure device allows the inflatable membrane to be inflated and deflated so as to facilitate the evacuation of the phytosanitary product from the container. Through its third opening, the closure device also allows the container and the inflatable membrane to be rinsed. The closure device is adaptable to any type of container, standard or not, and has the advantage of being compact, economical and ergonomic.

[0010] Advantageously, the closing device according to the invention further comprises an inflatable membrane, said inflatable membrane being connected to the second opening of the bottom wall, said inflatable membrane being configured to expand and / or contract by means of the pneumatic circuit, the inflatable membrane being arranged on the same side of the bottom wall as the peripheral wall.

[0011] The inflatable membrane, by its expansion, allows an overpressure to be generated in the can. In particular, the inflatable membrane is connected to the second opening of the bottom wall and is configured to expand and / or contract by means of the pneumatic circuit. It is configured to expand and retract in the can, once the closure device is placed on the can. The expansion of the inflatable membrane and the overpressure generated in the can allow the phytosanitary product to be sprayed contained in the can to be conveyed to the first opening of the closure device connected to a phytosanitary product outlet during use of the closure device.

[0012] Advantageously again, the inflatable membrane can be a flexible membrane ex- tensile.

[0013] The flexible extensible membrane is configured so that, when it expands under the action of the pneumatic circuit, it fits the internal wall of the container and allows all the phytosanitary product contained in the container to be pushed out of said container. In particular, it makes it easier to evacuate all the phytosanitary product from the container, even the liquid trapped in an irregularity in the wall of the container.

[0014] The invention also relates to a device for extracting a phytosanitary product from a container comprising at least one closure device as briefly described above, at least one pneumatic circuit and at least one phytosanitary product outlet, said closure device comprising at least one inflatable membrane, at least one bottom wall and at least one peripheral wall projecting from the bottom wall, said bottom wall having at least two openings, a first opening and a second opening, the first opening being connected to a phytosanitary product outlet allowing said phytosanitary product to be evacuated from said container, the second opening being on the one hand connected to the inflatable membrane and on the other hand connected to a pneumatic circuit inlet, said inflatable membrane being configured to expand and / or contract by means of the pneumatic circuit,the inflatable membrane being arranged on the same side of the bottom wall as the peripheral wall.

[0015] The closing device is intended to close a container. The pneumatic circuit, connected to the closing device by its second opening, allows the expansion of the inflatable membrane which itself allows the routing of the phytosanitary product towards the phytosanitary product outlet so that it can be sprayed by a spray bar.

[0016] According to one embodiment, the pneumatic circuit comprises at least one conduit, a distributor, a pressure regulator and a compressed air inlet, the conduit connecting the closing device to the distributor, itself connected by said conduit to the pressure regulator connected to the compressed air inlet, said pneumatic circuit being configured to allow the expansion of the inflatable membrane.

[0017] The compressed air inlet conveys compressed air to the pressure regulator which allows the air pressure to be maintained and controlled. In particular, the regulator allows the compressed air to be conveyed at the desired pressure to the closure distributor. The injection of air into the inflatable membrane allows the expansion of said membrane, which generates an overpressure in the can. The expansion of the inflatable membrane and the overpressure generated in the can allow the liquid to be sprayed to be conveyed to the first opening of the closure device connected to a plant protection product outlet.

[0018] Advantageously, the pneumatic circuit further comprises a generator of vacuum, said conduit connecting the vacuum generator to the distributor, said vacuum generator being configured to suck the air contained in the inflatable membrane, causing it to contract.

[0019] Once the container is emptied of the phytosanitary product, the vacuum generator allows the air contained in the inflatable membrane to be sucked out, which causes it to contract in the container.

[0020] Advantageously, the pneumatic circuit further comprises a conduit, an air rinsing distributor and a pressure regulator, said conduit connecting the compressed air inlet to the pressure regulator, itself connected by said conduit to the air rinsing distributor, itself connected to the phytosanitary product outlet, said pneumatic circuit being configured to allow the air rinsing of the phytosanitary product outlet.

[0021] The compressed air inlet conveys compressed air to the pressure regulator which allows the air pressure to be maintained and controlled, then to the air rinsing distributor before conveying it into the duct from the plant protection product outlet to the spray bar. Injecting air into the ducts up to the spray bar makes it possible to rinse with air the ducts through which the sprayed plant protection product has been conveyed. In particular, the pneumatic circuit here makes it possible to evacuate the particles of plant protection product remaining in the ducts.

[0022] Advantageously, the extraction device according to the invention further comprises a hydraulic rinsing circuit and in which the bottom wall of said closing device has a third through opening connected to an inlet of said hydraulic rinsing circuit, configured to allow rinsing of the container and the inflatable membrane.

[0023] The hydraulic rinsing circuit allows the delivery of a rinsing liquid such as clear water to the third opening of the closure device, then into the container. Said hydraulic circuit is configured to rinse the container with the rinsing liquid, once the phytosanitary product has been evacuated. In particular, the hydraulic rinsing circuit allows the evacuation of the particles of phytosanitary product remaining in the container. Thus, the hydraulic circuit prevents the stagnation of the phytosanitary product in the container but also on the inflatable membrane.

[0024] The invention also relates to a liquid spraying system comprising an extraction device as briefly described above and further comprising a container configured to contain a phytosanitary product and to which said closure device is fixed, the container being on the one hand connected, by the first opening of the closure device, to a conduit of the treatment liquid outlet configured to convey the phytosanitary product from the container to at least one spray nozzle, the canister being further connected by the third opening of the closure device to an inlet conduit of the hydraulic rinsing circuit configured to convey rinsing liquid into the canister so that said rinsing liquid rinses said canister, and said canister being connected by the second opening of the closure device to an inlet conduit of the pneumatic circuit and to the inflatable membrane, said pneumatic circuit inlet conduit being configured to convey fluid into the inflatable membrane so that it expands in the enclosure of the canister, the expansion of said inflatable membrane being configured to pressurize the phytosanitary product in the canister so as to create a flow of said phytosanitary product towards the phytosanitary product outlet.

[0025] According to one embodiment, the spraying system comprises a pressurized enclosure, the canister and the extraction device being arranged inside the pressurized enclosure.

[0026] The invention also relates to an agricultural machine comprising a liquid spraying system as briefly described above. PRESENTATION OF FIGURES

[0027] The invention will be better understood on reading the following description, given solely by way of example, and referring to the appended drawings given by way of non-limiting examples, in which identical references are given to similar objects and in which:

[0028] [Fig.l] is a schematic representation of a device for extracting a phytosanitary product according to the invention, placed on a container, said extraction device comprising a closing device connected to a pneumatic circuit, to a phytosanitary product outlet and to a hydraulic rinsing circuit, said closing device comprising an inflatable membrane partially inflated in the container;

[0029] [Fig.2] is a view similar to [Fig.l], but the inflatable membrane of the closure device is here more inflated and fits the internal wall of the container;

[0030] [Fig.3] is a diagram of the pneumatic circuit shown in [Fig.l], allowing the inflatable membrane of the closure device to be expanded and / or contracted;

[0031] [Fig.4] shows an embodiment similar to that of [Fig.3], except that the canister and the extraction device are arranged in a pressurized enclosure;

[0032] [Fig.5] is identical to [Fig.l], except that the canister and the extraction device are arranged in a pressurized enclosure.

[0033] It should be noted that the figures set out the invention in detail to enable the invention to be implemented; although not limiting, said figures serve in particular to better define the invention where appropriate. DETAILED DESCRIPTION OF THE INVENTION

[0034] The invention relates to a spraying system comprising a can 2 and a device 1 for extracting a phytosanitary product. In particular, the can 2 is intended to contain phytosanitary product and the extraction device 1 is configured to allow and facilitate the extraction of the phytosanitary product outside the can 2 so as to be sprayed by the spraying system mounted on an agricultural machine such as an agricultural sprayer.

[0035] As shown in Figures 1 and 2, the phytosanitary product extraction device 1 comprises at least one closing device 3, at least one pneumatic circuit 4 and at least one phytosanitary product outlet 5.

[0036] The extraction device 1 may further comprise the container 2 and a hydraulic rinsing circuit 6 configured to allow the container 2 to be rinsed.

[0037] The term "can" means any container of active product, in other words of the phytosanitary product, in particular potentially any type of reservoir originally containing the phytosanitary product. The term "can" also covers a container into which the phytosanitary product would be transferred, in particular from a reservoir.

[0038] The container 2 is configured to contain the phytosanitary product. The container 2 is a standardized container or one not known in the state of the art, having various shapes and volumes. In particular, it may contain phytosanitary liquid allowing the treatment of the plants on which it is sprayed.

[0039] The closing device 3 is intended to close the container 2.

[0040] In particular, the closing device 3 comprises at least one bottom wall 30 and at least one peripheral wall 31.

[0041] The closing device 3 may for example take the form of a cap.

[0042] The peripheral wall 31 projects from the bottom wall 30. In particular, the peripheral wall 31 may extend around the periphery of the bottom wall 30. Said peripheral wall 31 and said bottom wall 30 delimit a fixing housing 32.

[0043] In particular, the peripheral wall 31 is configured to cooperate with the container 2, so as to close the latter.

[0044] According to a particular embodiment of the invention, the peripheral wall 31 has a thread configured to adapt to a screw thread of the container 2, and thus allow the container 2 to be closed.

[0045] According to another embodiment, the peripheral wall 31 may comprise a clip system configured to cooperate with a complementary clip system present on the container 2, allowing the container 2 to be closed.

[0046] It goes without saying that the invention is not limited to these two methods of closing the container 2, but applies to any type of closing method allowing the container 2 to be closed by the closing device 3.

[0047] The bottom wall 30 has at least three through openings, namely a first opening 33, a second opening 34 and a third opening 35.

[0048] The first opening 33 is configured to be connected to the phytosanitary product outlet 5, allowing the phytosanitary product contained in the container 2 to be evacuated from said container 2.

[0049] The second opening 34 is on the one hand configured to open in a sealed manner into an inflatable membrane 36 and on the other hand to be connected to an inlet of the pneumatic circuit 4, so as to allow an overpressure to be generated in the container 2 by the expansion of the inflatable membrane 36 by means of the pneumatic circuit 4, and so as to allow the inflatable membrane 36 to be deflated if necessary.

[0050] Advantageously, the extraction device 1 may further comprise a closing member (not shown) between the closing device 3 and the pneumatic circuit 4. Said closing member is then configured to prevent the flow of the phytosanitary product contained in the container 2, in particular by gravity when the container 2 is placed in the extraction device 1 or when the closing device 3 is placed on the container 2 for example. The closing member may for example be a tap, a standard coupler, etc.

[0051] The third opening 35 is configured to be connected to an inlet of the hydraulic rinsing circuit 6.

[0052] The closing device 3 may further comprise the inflatable membrane 36.

[0053] The inflatable membrane 36 is connected to the second opening 34 of the bottom wall 30. The inflatable membrane 36 is configured to expand and / or contract by means of the pneumatic circuit 4.

[0054] The inflatable membrane 36 is arranged on the same side of the bottom wall 30 as the peripheral wall 31. In other words, the inflatable membrane 36 is connected to the second opening 34, in the fixing housing 32.

[0055] According to a particular embodiment of the invention, the inflatable membrane 36 is an extensible flexible membrane.

[0056] In particular, the extensible flexible membrane is configured so that, when it expands under the action of the pneumatic circuit, it fits the internal wall of the container 2, as shown in [Fig.2].

[0057] It should be noted that the inflatable membrane 36 can fit all of the walls of the container 2. In other words, the walls of the container 2 delimiting its opening closed by the closing device 3 can also be covered by the flexible membrane 36.

[0058] According to another embodiment of the invention, the inflatable membrane 36 may have a predetermined shape corresponding to the shape of the container 2, in particular the shape of the internal volume of the container 2. Under the action of the pneumatic circuit 4, the inflatable membrane 36 expands until it reaches its predetermined shape.

[0059] In the extraction device 1 shown in Figures 1 and 2, the device of closure 3 closes the container 2. In particular, the closure device 3 replaces the cap of the container 2. For this, the closure device 3 is fixed to the container 2, so as to close its opening delimited by its wall.

[0060] In particular, the fixing housing 32 is configured to house a portion of the wall of the container 2, making it possible to close the opening of said container 2. The bottom wall 30 of the closure device 3 is sized to correspond to the opening of the container 2 and the peripheral wall is configured to cooperate with the portion of the wall of the container 2. For example, the peripheral wall 31 may be, on its internal surface intended to be in contact with the container 2, threaded. The external wall portion of the container 2, intended to be in contact with the peripheral wall 31 of the closure device 3, may be threaded. The threading of the peripheral wall 31 corresponds to the threading of the wall portion of the container 2, so that the closure device 3 is fixed to the container 2.

[0061] The pneumatic circuit 4 is configured to allow the expansion of the inflatable membrane 36.

[0062] In particular, in an initial position corresponding to the position in which the container 2 is completely filled with phytosanitary product, the inflatable membrane 36 is completely retracted and arranged inside the container 2. When it is desired to spray the phytosanitary product by the agricultural machine, the liquid must be evacuated from the container 2. For this, the pneumatic circuit 4 conveys air into the inflatable membrane 36, so as to allow its expansion and generate an overpressure in the container 2. The expansion of the inflatable membrane 36 and the overpressure generated in the container 2 allow the liquid to be sprayed to be conveyed to the first opening 33 of the closure device 3 connected to the phytosanitary product outlet 5.

[0063] Advantageously, the pneumatic circuit 4 may comprise a control device (not shown) configured to control the quantity of air to be injected into the inflatable membrane 36.

[0064] The outlet of the phytosanitary product 5 may comprise a conduit 50, a valve 51 and a pump 52.

[0065] In particular, the conduit 50 is configured to convey the phytosanitary product from the closure device 3 to the spray boom of the agricultural machine. In addition, the conduit 50 connects the first opening 33 of the closure device 3 to the valve 51, the valve 51 to the pump 52 and the pump 52 to the spray boom.

[0066] Once switched on, the pump 52 enables the circulation of the phytosanitary product from the container 2 to be activated towards the inlet of the pump 52.

[0067] The valve 51 may for example be a simple non-return valve.

[0068] The valve 51 allows the passage of the phytosanitary product in the direction of evacuation of the phytosanitary product from the container 2, that is to say from the closing device 3 towards the spray bar. On the contrary, the valve 51 prevents the circulation of the phytosanitary product in the opposite direction, that is to say towards the can 2.

[0069] Thus, once the pump 52 is switched on, the phytosanitary product is conveyed from the container 2, towards the valve 51 then towards the inlet of the pump 52 to then be conveyed towards the spray bar.

[0070] Advantageously, the extraction device 1 may also here further comprise a closing member (not shown) between the closing device 3 and the valve 51. Said closing member is configured to prevent the flow of the phytosanitary product contained in the container 2, in particular by gravity when the container 2 is placed in the extraction device 1 or when the closing device 3 is placed on the container 2 for example. The closing member may for example be a tap, a standard coupler, etc.

[0071] The pneumatic circuit 4 shown in [Fig. 3], may comprise a conduit 40 connecting the closing device 3 to a distributor 41, itself connected by the conduit 40 to a pressure regulator 42 connected to a compressed air inlet 43.

[0072] In particular, the pipe 40 connects the second opening 34 of the closing device 3 to the compressed air inlet 43.

[0073] The compressed air inlet 43 conveys compressed air to the pressure regulator 42 which allows the air pressure to be maintained and controlled. The injection of compressed air into the inflatable membrane 36 allows the expansion of said membrane 36, which generates an overpressure in the can 2. The expansion of the inflatable membrane 36 and the overpressure generated in the can 2 allow the liquid to be sprayed to be conveyed to the first opening 33 of the closure device 3 connected to a phytosanitary product outlet.

[0074] In addition, the pneumatic circuit 4 may further comprise a conduit 44 connecting the compressed air inlet 43 to a pressure regulator 45, itself connected by the conduit 44 to an air rinsing distributor 46. The air rinsing distributor 46 is also connected by another conduit to a valve 47 connected to the outlet of the phytosanitary product 5.

[0075] The compressed air inlet 43 conveys compressed air to the pressure regulator 45 which allows the air pressure to be maintained and controlled, then to the air rinsing distributor 46 which allows it to be conveyed into the conduit from the plant protection product outlet 5, to the spray bar. The injection of air into the conduits up to the spray bar makes it possible to rinse with air the conduits through which the sprayed plant protection product has been conveyed. In particular, the pneumatic circuit 4 here makes it possible to evacuate the particles of plant protection product remaining in the conduits.

[0076] In addition, the pneumatic circuit 4 may further comprise a conduit 48 connecting the compressed air supply 43 to a distributor 49, itself connected by the conduit 48 to a vacuum generator 7. Furthermore, the distributor 41 is connected to the vacuum generator 7. The vacuum generator 7 is responsible for accelerating the air present in the conduit 48 in order to create a depression in this conduit 48, so as to suck the air present in the inflatable membrane 36 and thus deflate it. The pressure inside the inflatable membrane 36 may then possibly be lower than atmospheric pressure. Said vacuum generator 7 operates thanks to the venturi effect.

[0077] The distributor 49 makes it possible to activate the vacuum generator 7 when it is desired to deflate the inflatable membrane 36.

[0078] Once the container 2 has been emptied of the phytosanitary product, the vacuum generator 7 would then allow the air contained in the inflatable membrane 36, which has been decompressed by the distributor 41, to be sucked out, which would cause it to contract in the container 2.

[0079] The vacuum generator 7 may, for example, be a venturi.

[0080] In parallel with the vacuum generator 7, in particular the venturi, there may be provided, still with regard to [Fig. 3], a valve 471 allowing the inflatable membrane 36 to be decompressed without passing through the vacuum generator 7. The inflatable membrane 36 is then not drawn to a vacuum, the pressure inside the inflatable membrane 36 cannot therefore be lower than atmospheric pressure. In this embodiment, according to a first mode of operation, the distributor 49 allows the compressed air to pass and the inflatable membrane 36 is decompressed, by means of the vacuum generator 7, through the distributor 41, which is described previously. According to a second mode of operation, the distributor 49 does not allow the compressed air to pass, the distributor 41 then being in a position configured to allow the air contained in the inflatable membrane 36 to pass, which has no other choice but to exit through the valve 471.

[0081] The hydraulic rinsing circuit 6 is connected by a conduit 60 to a valve 61, itself connected to the flap 62, itself connected to the third opening 35 of the closing device 3.

[0082] The hydraulic rinsing circuit 6 allows the routing of rinsing liquid such as clear water through the conduit 60, then through the valve 61 and the flap 62 to the third opening 35 of the closing device 3, then into the container 2.

[0083] The valve 62 may for example be a simple non-return valve.

[0084] The valve 62 allows the passage of clear water towards the inside of the container 2, that is to say in the direction of the closing device 3. On the contrary, the valve 62 prevents the circulation of clear water in the opposite direction, that is to say in the direction of the hydraulic circuit 6.

[0085] In this embodiment also, the extraction device 1 can advantageously further comprise a closing member (not shown) between the closing device 3 and the valve 62. Said closing member is configured to prevent the flow of the phytosanitary product contained in the container 2, in particular by gravity when placing the container 2 in the extraction device 1 or when placing the closing device 3 on the container 2 for example. The closing member may for example be a tap, a standard coupler, etc.

[0086] The hydraulic rinsing circuit 6 is configured to rinse with clear water, for example, the container 2 once the phytosanitary product has been evacuated. In particular, the hydraulic rinsing circuit 6 makes it possible to evacuate the particles of phytosanitary product remaining in the container 2, as well as on the inflatable membrane 36.

[0087] Thus, the hydraulic circuit 6 prevents stagnation of the phytosanitary product in the container 2.

[0088] When the can 2 is completely filled with plant protection product, in its initial position, the inflatable membrane 36 is completely retracted and extends inside the can 2. When it is desired to spray plant protection product, the plant protection product is evacuated from the can 2. The pneumatic circuit 4, by its compressed air inlet 43, conveys compressed air to the pressure regulator 42 before conveying it into the inflatable membrane 36. The injection of compressed air into the inflatable membrane 36 allows the expansion of said membrane 36, which generates an overpressure in the can 2. The expansion of the inflatable membrane 36 and the overpressure generated in the can 2 allow the conveyance of the liquid to be sprayed towards the first opening 33 of the closure device 3 connected to a plant protection product outlet. The inflatable membrane 36 expands so as to evacuate the quantity of phytosanitary product necessary for spraying.The inflatable membrane 36 makes it possible to push the phytosanitary product out of the container 2. In particular, the inflatable membrane 36 is configured to fit the internal wall of the expanding container 2 and to push the phytosanitary product, even if it is stuck in a portion of the enclosure of the container 2.

[0089] Once the phytosanitary product has been completely evacuated from the container 2, the vacuum generator 7 of the pneumatic circuit 4 can suck in the air contained in the inflatable membrane 36, which would first pass through the distributor 41 which would allow the air to be conveyed to the vacuum generator 7, which would cause it to contract in the container 2.

[0090] Then, the hydraulic rinsing circuit 6 conveys rinsing liquid such as clear water into the container 2, through the conduit 60, then through the valve 61 and the flap 62 to the third opening 35 of the closing device 3. The clear water thus conveyed into the container 2 makes it possible to evacuate the particles of phytosanitary product remaining in the container 2 and on the inflatable membrane 36.

[0091] The clear water containing the particles of phytosanitary product then forms water gray water. This gray water is evacuated through pipe 50. The gray water is then routed, for example, to the spray boom of the agricultural machine or to a tank for storing it before spraying.

[0092] Finally, the compressed air inlet 43 of the pneumatic circuit 4 conveys compressed air to the pressure regulator 45 and then to the air rinsing distributor 46 before conveying it into the conduit of the phytosanitary product outlet 5, to the spray bar. The injection of air into the conduits up to the spray bar makes it possible to rinse with air the conduits through which the sprayed phytosanitary product and / or the gray water have been conveyed. In particular, the pneumatic circuit 4 here makes it possible to evacuate the particles of phytosanitary product remaining in the conduits.

[0093] The closing device 3 can be single-use or reusable.

[0094] In the case where the closing device 3 is reusable, it can be removed from the empty container 2 and rinsed then mounted on another filled container 2 containing the same phytosanitary product or any other liquid.

[0095] [Fig.4] and [Fig.5] schematically represent a particular embodiment, in which the can and the cap are arranged in a pressurized enclosure. [Fig.4] is identical to [Fig.3], except in that it shows the pressurized enclosure 70. [Fig.5] is identical to [Fig.1], except in that it shows the pressurized enclosure 70.

[0096] According to the embodiment shown in [Fig.4] and [Fig.5], it is thus possible to place the entire extraction device 1, as well as the can 2, in a closed pressurized enclosure 70. The pressurized enclosure 70 is configured to withstand significant pressures, in particular of the order of or greater than 6 bars, for example of the order of 10 bars. It is then possible to pressurize this pressurized enclosure 70 at the same time as the fluid contained inside the can 2, thanks to the air regulator 42. This makes it possible to maintain the same pressure inside the pressurized enclosure 70 and inside the inflatable membrane 36 and consequently inside the can 2. Consequently, there is then no pressure difference between the inside and the outside of the can 2.It is therefore possible to apply greater pressure to the container 2, regardless of its intrinsic physical characteristics of resistance to pressure, due to this balance between the pressure inside the container 2 and the pressure maintained in the pressurized enclosure 70 and therefore applied to the outside of the container 2.

[0097] The difference between the pressure of the phytosanitary product and the atmospheric pressure is, in this embodiment, potentially high. For example, a pressure of the order of ten bars can be maintained in the pressurized enclosure 70. This can also make it possible to supply the spray boom with phytosanitary product. sanitary without using a pump 52 to inject the phytosanitary product.

[0098] It will also be noted that the invention is not limited to the embodiments described above. It will indeed appear to those skilled in the art that various modifications can be made to the embodiment described above, in light of the teaching which has just been disclosed to them.

[0099] In particular, according to a variant, the vacuum generator 7 is omitted and the inflatable membrane 36 is not deflated by means of said vacuum generator 7 but in contact with the clear water conveyed into the container 2 for its rinsing.

[0100] In the detailed presentation of the invention which is made above, the terms used must not be interpreted as limiting the invention to the embodiment set out in the present description, but must be interpreted to include all equivalents whose prediction is within the reach of a person skilled in the art by applying his general knowledge to the implementation of the teaching which has just been disclosed to him.

Claims

Claims

1. Closing device (3) intended to cooperate with a hydraulic rinsing circuit (6), with a pneumatic circuit (4) for an agricultural spraying system, with a phytosanitary product outlet (5) and with a container (2) of phytosanitary product, the closing device (3) comprising: • at least one bottom wall (30); and • at least one peripheral wall (31);the closing device (3) being intended to close the container (2), the peripheral wall (31) projecting from the bottom wall (30), said bottom wall (30) having at least three through openings, namely a first opening (33), a second opening (34) and a third opening (35), the first opening (33) being configured to be connected to the phytosanitary product outlet (5) allowing said phytosanitary product to be evacuated from said container (2), the second opening (34) being on the one hand configured to open in a sealed manner into an inflatable membrane (36) and on the other hand configured to be connected to an inlet of the pneumatic circuit (4), so as to allow an overpressure to be generated in the container (2) by the expansion of the inflatable membrane (36) by means of the pneumatic circuit (4), said third opening (35) being configured to be connected to an inlet of said hydraulic rinsing circuit (6).;

2. Closing device (3) according to the preceding claim, further comprising an inflatable membrane (36), said inflatable membrane (36) being connected to the second opening (34) of the bottom wall (30), said inflatable membrane (36) being configured to expand and / or contract by means of the pneumatic circuit (4), the inflatable membrane (36) being arranged on the same side of the bottom wall (30) as the peripheral wall (31).

3. Closure device (3) according to the preceding claim, in which the inflatable membrane (36) is an extensible flexible membrane.

4. Device (1) for extracting phytosanitary product from a container (2) of phytosanitary product, comprising: • at least one closing device (3) according to any one of claims 1 to 3; • at least one pneumatic circuit (4); and • at least one phytosanitary product outlet (5); said closure device (3) comprising at least one inflatable membrane (36), at least one bottom wall (30) and at least one peripheral wall (31) projecting from the bottom wall (30), said bottom wall (30) having at least two through openings, a first opening (33) and a second opening (34), the first opening (33) being connected to a phytosanitary product outlet (5) allowing said phytosanitary product to be evacuated from said container (2), the second opening (34) being on the one hand connected to the inflatable membrane (36) and on the other hand connected to a pneumatic circuit inlet (4), said inflatable membrane (36) being configured to expand and / or contract by means of the pneumatic circuit (4), the inflatable membrane (36) being arranged on the same side of the bottom wall (30) as the peripheral wall (31).

5. Extraction device (1) according to the preceding claim, in which the pneumatic circuit (4) comprises at least one conduit (40), a distributor (41), a pressure regulator (42) and a compressed air inlet (43), the conduit (40) connecting the closing device (3) to the distributor (41), itself connected by said conduit (40) to the pressure regulator (42) connected to the compressed air inlet (43), said pneumatic circuit (4) being configured to allow the expansion of the inflatable membrane (36).

6. Extraction device (1) according to the preceding claim, wherein the pneumatic circuit (4) further comprises a vacuum generator (7), said conduit (40) connecting the vacuum generator (7) to the distributor (41), said vacuum generator (7) being configured to suck the air contained in the inflatable membrane (36), causing it to contract.

7. Extraction device (1) according to one of claims 5 to 6, wherein the pneumatic circuit (4) further comprises a conduit (44), an air rinsing distributor (46) and a pressure regulator (45), said conduit (44) connecting the compressed air inlet (43) to the pressure regulator (45), itself connected by said conduit (44) to the air rinsing distributor (46), itself connected to the phytosanitary product outlet (5), said pneumatic circuit (4) being configured to allow the air rinsing of the phytosanitary product outlet (5).

8. Extraction device (1) according to any one of claims 4 to 7, further comprising a hydraulic rinsing circuit (6) and in which the bottom wall (30) of the closing device (3) has a third opening (35) connected to an inlet of said hydraulic rinsing circuit (6), configured to allow rinsing of the container (2) and the inflatable membrane (6).

9. Liquid spraying system comprising an extraction device according to any one of claims 4 to 8 and further comprising a container (2) configured to contain a phytosanitary product and on which said closure device (3) is fixed, the container (2) being on the one hand connected, by the first opening (33) of the closure device (3), to a conduit (50) of the treatment liquid outlet (5) configured to convey the phytosanitary product from the container (2) to at least one spray nozzle, the container (2) being on the other hand connected by the third opening (35) of the closure device (3) to an inlet conduit of the hydraulic rinsing circuit (6) configured to convey rinsing liquid into the container (2) so that said rinsing liquid rinses said container (2),and said container being connected by the second opening (34) of the closure device (3) to an inlet conduit of the pneumatic circuit (4) and to the inflatable membrane (36), said pneumatic circuit inlet conduit (4) being configured to convey fluid into the inflatable membrane (36) so that it expands in the enclosure of the container (2), the expansion of said inflatable membrane (36) being configured to pressurize the phytosanitary product of the container (2) so as to create a flow of said phytosanitary product towards the phytosanitary product outlet (5).,

10. A liquid spraying system according to claim 9, comprising a pressurized enclosure (70), the canister (2) and the extraction device (1) being arranged inside the pressurized enclosure.

11. Agricultural machinery comprising a liquid spraying system according to claim 9 or 10.

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