Coupling device for canister

Abstract

Coupling device (10) for canisters (12), in particular for canisters with an inner lid closure for a closed transfer system for plant protection products and / or liquid fertilizers, comprising a housing (32) with an inlet for coupling an outlet opening of a canister, with an outlet for connecting to a mixing device and / or a storage tank, with valve means for opening and closing a flow connection from the inlet to the outlet, and with a cleaning lance (24), wherein the cleaning lance (24) is retractable into the canister (12) when the canister (12) is coupled, wherein the cleaning lance (24) is rotatable about its longitudinal axis relative to the housing (32) and in a state that is at least partially retracted into the canister (12).

Description

[0001] The invention relates to a coupling device for canisters, in particular for canisters with an inner lid closure for a closed transfer system for crop protection agents and / or liquid fertilizers, with a housing with an inlet for coupling an outlet opening of a canister, with an outlet for connecting to a mixing device and / or a storage tank, with valve means for opening and closing a flow connection from inlet to outlet and with a cleaning lance, wherein the cleaning lance can be inserted into the canister when the canister is coupled.

[0002] International patent application WO 2018 / 115285 A1 discloses a coupling device for canisters with an inner lid closure for a closed transfer system for crop protection products and / or liquid fertilizers. The coupling device comprises a housing with an inlet for coupling to an outlet opening of a canister, with an outlet for connecting to a mixing device and / or a storage tank, with valve means for opening and closing a flow connection from the inlet to the outlet, and with a cleaning lance, wherein the cleaning lance can be inserted into the canister when the canister is coupled. The coupling device is designed for canisters with an inner lid closure, so-called Easyconnect inner lid closures. After placing the canister on the coupling device, the canister is first secured to the coupling device, and then the inner lid closure is opened by turning a lever.A lance is inserted into the canister, with the sliding movement of the lance being controlled by a second lever. Valves between the inlet and outlet of the coupling device are then manually opened until the desired amount of liquid has been drawn from the canister. Once the canister is completely emptied, the lance can be used as a cleaning lance to clean the interior of the canister and then also the exterior of the canister's inner lid. By turning the first lever back, the canister is released and can be removed from the coupling device.

[0003] Another coupling device for canisters for a closed transfer system for crop protection products and / or liquid fertilizers is known from the German laid-open specification DE 102016110009 A1 and from the international laid-open specification WO 2019 / 094883 A1.

[0004] The invention aims to improve a coupling device for canisters.

[0005] According to the invention, a coupling device for canisters with the features of claim 1, claim 6, or claim 15 is provided. Advantageous developments of the invention are specified in the subclaims.

[0006] A coupling device for canisters, in particular for canisters with an inner lid closure for a closed transfer system for crop protection agents and / or liquid fertilizers, has a housing with an inlet for coupling an outlet opening of a canister, with an outlet for connecting to a mixing device and / or a storage tank, with valve means for opening and closing a flow connection from the inlet to the outlet and with a cleaning lance, wherein the cleaning lance can be inserted into the canister in the coupled state of the canister, wherein the cleaning lance is rotatable about its longitudinal axis relative to the housing and in a state in which it is at least partially inserted into the canister.

[0007] By means of a cleaning lance that can be rotated within the canister, the cleaning effect can be significantly improved. In particular, the canister does not have to be rotated by hand relative to the housing, which carries the risk of the canister becoming loose. By rotating the cleaning lance, all points on the inner wall of the canister can be reached and the cleaning fluid can impinge on all points on the inner wall of the canister with sufficient impact to rinse away any residue of the fluid originally contained in the canister, for example pesticides and / or liquid fertilizer. Within the scope of the invention, the cleaning lance can also be automatically rotated around its longitudinal axis and pushed into the canister or pushed out of the canister a short distance. This ensures extremely thorough cleaning of the inner wall of the canister and, for example, different cleaning processes are possible for different canister shapes.

[0008] In a further development of the invention, a first actuator, in particular an electric motor coupled to a threaded spindle, is provided in order to move the cleaning lance relative to the housing and at least partially into the canister.

[0009] A first actuator, particularly an electric motor, can be used to control the sliding movement of the cleaning lance. This allows for insertion in multiple steps, with intermediate stops. The first actuator can, for example, interact with a threaded spindle to achieve a smooth insertion and extension movement of the cleaning lance relative to the canister. An electric motor can be coupled to the threaded spindle via a chain.

[0010] In a further development of the invention, a first actuator, in particular an electric motor, is provided to rotate the cleaning lance relative to the housing about a longitudinal axis of the cleaning lance.

[0011] In this way, one or more spray nozzles arranged on the cleaning lance can reach every point on the inner wall of the canister. A coupled displacement movement and rotational movement is possible within the scope of the invention in order to enable particularly thorough cleaning even of large, particularly tall, canisters. A rotation can occur, for example, through 180°. If two or more spray nozzles are arranged on the cleaning lance, which spray in opposite directions, for example, the inner circumference of a canister can be completely cleaned. The first actuator is therefore responsible for both an axial displacement of the cleaning lance relative to the housing and for a rotation of the cleaning lance relative to the housing about a longitudinal axis of the cleaning lance. The actuator is coupled to the threaded spindle by means of a chain.A rotation of the threaded spindle can then not only shift the cleaning lance relative to the housing, but also simultaneously rotate the cleaning lance relative to the housing. If necessary, the cleaning lance can be coupled to the threaded spindle in such a way that the cleaning lance either rotates only relative to the housing, is only shifted relative to the housing, or is simultaneously shifted and rotated relative to the housing.

[0012] In a further development of the invention, a guide track is provided in order to move and / or rotate the cleaning lance relative to the housing.

[0013] Using a slide track, for example, a sliding movement can be converted into a rotary movement or into a combined sliding and rotary movement. For example, the slide track has a straight section and a helical section so that when the cleaning lance is moved upwards, it first moves the cleaning lance upwards in a straight line and then rotates it in addition to a further upward movement. This allows the interior wall of a canister to be reliably cleaned.

[0014] In a further development of the invention, a threaded spindle and at least one sliding block connected to the threaded spindle are provided, which is received in the sliding track.

[0015] By simply turning the threaded spindle, for example with an electric motor, the cleaning lance can be moved upwards. Depending on the design of the guide track into which the sliding block engages, the displacement movement of the cleaning lance caused by the threaded spindle can be superimposed with a rotational movement. In a further development of the invention, a second actuator, in particular an electric motor, is provided to fix a canister attached to the coupling device and to actuate the valve means.

[0016] The second actuator is coupled to a coupling mechanism for securing and releasing the canister and to the valve means by means of a chain. The canister can thus be secured independently of the cleaning lance being moved into the canister. When the cleaning lance is moved into the canister, the canister's closure can also be opened at the same time. This makes it possible to initially secure the canister using the second actuator. In a second step, the canister can be opened, for example, by opening an inner lid closure of the canister by pushing the cleaning lance into the canister using the first actuator. The valve means can then be opened using the second actuator so that liquid can be withdrawn from the canister via the cleaning lance. The valve means are closed again using the second actuator to stop the liquid being withdrawn.The first actuator then retracts the cleaning lance from the canister, and the inner lid of the canister is simultaneously closed. Once the canister has been completely emptied, the interior of the canister can be rinsed using the cleaning lance before the canister is closed. The second actuator releases the canister attached to the coupling device after the rinsing process is complete.

[0017] The first actuator and / or the second actuator can be designed as a stepper motor.

[0018] In this way, the angular position and displacement position of the cleaning lance is known to a control unit, and suitable cleaning programs can be run automatically. When opening and closing the valves, a stepper motor can be used to distinguish between slow opening or closing and rapid opening or closing. For example, the valves are closed slightly shortly before the target quantity is reached in order to achieve the target quantity as precisely as possible. It is also possible, for example, to incrementally close the valves shortly before the target quantity is reached in order to slowly approach the target quantity of withdrawn liquid. If, on the other hand, rinsing liquid is drained, the valves can be quickly opened completely.

[0019] A protective housing, in particular with a cover, can be provided in which the housing, in particular also an outer housing, of the coupling device is arranged.

[0020] In this way, if the coupling device is mounted on an agricultural implement, such as a field sprayer, the coupling device can be protected from damage and contamination by closing the protective housing during operation. If a canister is to be coupled to the coupling device, the lid of the protective housing is opened, for example. After the required amount of liquid has been drawn from the canister, the canister is uncoupled again, the lid is closed, and the coupling device is protected from contamination during subsequent spraying, for example.

[0021] The object underlying the invention is also achieved by a coupling device for canisters, in particular for canisters with an inner lid closure for a closed transfer system for crop protection agents and / or liquid fertilizers, which coupling device comprises a housing with an inlet for coupling an outlet opening of a canister, an outlet for connecting to a mixing device and / or a storage tank, with valve means for opening and closing a flow connection from the inlet to the outlet and with a cleaning lance, wherein the cleaning lance can be inserted into the canister when the canister is coupled, and wherein a weighing device is provided for detecting a weight of the canister in the coupled state.

[0022] A weighing device can be used to continuously record the weight of the canister while it is coupled. This makes it possible to determine, if necessary after conversion or processing of the measured values, how much liquid has been withdrawn from the canister. This makes it possible to determine the actual amount of liquid withdrawn, and this actual amount can then be compared in the weighing device or an electronic control unit assigned to the weighing device with a target amount that was entered by an operator, for example, or that was read in automatically. The weighing device can be used to record the weight of the part of the coupling device to which the canister is coupled. If the weight of this part of the coupling device is known, the current weight of the canister can also be recorded.The weight of the empty canister can also be taken into account, allowing for extremely precise determination of the weight of the canister at different times of withdrawal and thus also extremely precise determination of the amount of liquid withdrawn.

[0023] In a further development of the invention, the weighing device has at least one retaining bolt provided with strain gauges.

[0024] The part of the coupling device to which the canister is coupled is connected to the at least one retaining bolt. The weight of the coupling device and the changing weight of the canister during liquid withdrawal lead to varying deformation of the retaining bolt. This deformation of the retaining bolt can be recorded using strain gauges, which ultimately allows the current weight of the canister to be determined at different times during liquid withdrawal.

[0025] In a further development of the invention, the housing is connected to an outer housing by means of at least one retaining bolt.

[0026] The outer housing stands, for example, on a foundation or is fixed to the frame of an agricultural implement, such as a field sprayer. The housing of the coupling device, to which the canister is coupled, is connected to the outer housing only by means of the at least one retaining bolt. This allows the weight of the housing, including any attached canister, to be measured by means of the at least one retaining bolt or the strain gauges on the retaining bolt. The weighing device can be arranged on the outer housing.

[0027] A fixing device may be provided to selectively fix the housing to the outer housing, wherein the fixing device is provided in addition to the at least one retaining bolt.

[0028] In this way, the at least one retaining bolt can be relieved of load, for example, during driving or when the coupling device is deactivated. This prevents the at least one retaining bolt from being subjected to excessive load, for example, due to vibrations during driving or improper handling. The locking device can be coupled to an actuator and, for example, have a locking bolt that is inserted from the outer housing into a suitable recess in the housing. The locking device can be engaged or disengaged automatically under the control of a control unit.

[0029] In a further development of the invention, a first stop and a second stop are provided on the outer housing, wherein a portion of the weighing device is arranged between the first stop and the second stop, wherein the portion is arranged at a distance from the first stop and at a distance from the second stop in order to limit a movement of the portion of the weighing device relative to the outer housing to a travel range between the first stop and the second stop.

[0030] This prevents excessive movement of the weighing device, for example, during driving. For example, if the coupling device is mounted on a field sprayer and the vehicle is transported along field paths, the resulting acceleration and impacts will inevitably deflect the weighing device relative to the outer housing. Excessive movement and the resulting potential damage to the weighing device can be prevented by the first and second stops.

[0031] In a further development of the invention, the weighing device is connected to the outer housing by means of elastic buffers.

[0032] In this way, vibrations during weighing can be eliminated, for example, or their influence on the measurement result can be minimized or eliminated. Vibrations can occur, for example, due to pump operation during weighing.

[0033] In a further development of the invention, the weighing device has three load cells, in particular three retaining bolts provided with strain gauges.

[0034] This allows the weight of the housing and the canister to be distributed across three retaining bolts, allowing for a highly reliable measurement.

[0035] An electronic control unit coupled to the weighing device can also be equipped with a position sensor or tilt sensor, such as a gyro-position sensor. This allows, for example, detection of whether the coupling device is aligned exactly vertically or at an angle to the ground. This information about the angular position can be taken into account when evaluating a measured value from the weighing device, allowing angle compensation to be performed. The amount of liquid withdrawn from a canister can thus be determined with high precision.

[0036] In a further development of the invention, the weighing device has three retaining bolts provided with strain gauges, and the three retaining bolts are arranged on an imaginary circular line and at an angle of 120° to each other.

[0037] In this way, an even distribution of the load on the individual retaining bolts can be achieved, which promotes precise measurement values ​​from the weighing device.

[0038] In a further development of the invention, an electronic control unit coupled to the weighing device is provided.

[0039] By means of an electronic control unit, the measured values ​​recorded by the load cells of the weighing device can be processed, for example converted into volume and / or control signals can be generated and output depending on the measured values.

[0040] In a further development of the invention, the control unit is coupled to the valve means in order to open or close the valve means between the inlet and outlet depending on measured values ​​of the weighing device.

[0041] In a further development of the invention, the control unit is designed, in particular by means of software running on the control unit, to close the valve means between the inlet and outlet when a target quantity for withdrawing liquid from the canister is reached and thereby to terminate the withdrawal process.

[0042] The weighing device can determine the actual amount of liquid withdrawn, possibly after conversion using the electronic control unit. After comparing the actual amount withdrawn with the target amount, the valves can be closed or opened to achieve the target amount as precisely as possible. The valves can be closed in several steps or incrementally shortly before the target amount is reached in order to achieve the target amount as precisely as possible.

[0043] In a further development of the invention, the control unit is designed, in particular by means of software running on the control unit, to add up partial quantities of liquid taken successively from several canisters.

[0044] For example, in preparation for a spraying process, a first canister can be completely emptied, and a partial amount can then be added from a second canister to achieve the target amount required for the spraying process. Since the control unit adds the withdrawn partial amounts together, error-prone calculations and calculations by the operator are eliminated.

[0045] In a further development of the invention, the control unit is designed, in particular by means of software running on the control unit, to calculate a volume of a withdrawn quantity of liquid by means of at least one measured value of the weighing device and a stored or read-in density of the withdrawn liquid.

[0046] The control unit has, for example, an input device for entering the density of a liquid contained in a canister. However, the control unit can also have a reading device for reading the density. Such a reading device can, for example, be designed as a code reading device for reading a letter code, a numeric code, a barcode, or a two-dimensional QR code. The code can, for example, be arranged on the canister itself.

[0047] In a further development of the invention, the control unit has means, in particular a reading device for a code, in particular by means of software running on the control unit, in order to automatically read properties of a liquid in a coupled canister, in particular density, into a memory of the storage unit.

[0048] The means are designed, for example, as a code reading device or as an RFID reading device. For example, the canister is provided with a label, and the code reading device can automatically read a code on the label when the canister is coupled, for example to read the density of the liquid in the canister. The read-in data can also contain a mixing ratio or the like. The canister can, for example, also be provided with an RFID chip, which is then read by a reader of the coupling device when the canister is coupled to the coupling device. The RFID chip usually contains only a unique identifier, in particular a number. This number is then assigned to data about a liquid contained in the canister in a database.

[0049] The object underlying the invention is also achieved by a coupling device for canisters, in particular for canisters with an inner lid closure for a closed transfer system for crop protection agents and / or liquid fertilizers, with a housing with an inlet for coupling an outlet opening of a canister, with an outlet for connecting a mixing device and / or a storage tank, with valve means for opening and closing a flow connection from the inlet to the outlet and with a cleaning lance, wherein the cleaning lance can be inserted at least partially into the canister in the coupled state of the canister, in which a control unit and at least one actuator are provided in order to automatically couple the canister, remove liquid from the canister, rinse an interior of the canister and / or an exterior of the closure of the canister, and / or uncouple the canister,in particular by means of software running on the control unit.

[0050] The canister is placed on the coupling device by hand, for example, and the target amount to be withdrawn is entered or read into a control unit. The coupling of the canister, the withdrawal of the specified target amount of liquid from the canister, the rinsing of the interior of the canister and / or the exterior of a canister closure, and the decoupling of the canister are then performed automatically by software running on the control unit. After the canister has been rinsed, the canister is automatically released so that it can be removed from the coupling device again.

[0051] Further features and advantages of the invention emerge from the claims and the following description of preferred embodiments of the invention in conjunction with the drawings. Individual features of the various illustrated and / or described embodiments of the invention can be combined with one another in any way without exceeding the scope of the invention. This also applies to the combination of individual features without other individual features with which they are presented in conjunction.

[0052] The drawings show: Fig. 1 a side view of a coupling device according to the invention according to a first embodiment, Fig. 2 a view of the sectional plane AA in Fig. 1,Fig. 3 the detail Z from Fig. 2 on an enlarged scale, Fig. 4 a view of a coupling device according to the invention according to a second embodiment obliquely from above, Fig. 5 a sectional view of the coupling device of the Fig. 4 , Fig. 6the sectional view of the Fig. 5 on a smaller scale, Fig. 7, detail A from Fig. 6 in enlarged scale, Fig. 8 detail B from Fig. 6 on an enlarged scale, Fig. 9 a partial sectional view of the coupling device of the Fig. 4 , Fig. 10detail C from Fig. 9 in enlarged scale, Fig. 11 the coupling device of the Fig. 4 with the protective housing removed from below and Fig. 12 the coupling device of the Fig. 11 from diagonally above.

[0053] Fig. 1 shows a side view of a coupling device 10 according to the invention, onto which a canister 12 (illustrated only schematically) is mounted and which is attached to a frame 14 (illustrated only schematically) of an agricultural implement, for example, a field sprayer. The coupling device 10 can also be used stationary and could then, for example, be attached to a building wall or a support frame in a hall.

[0054] The illustrated embodiment of the coupling device 10 operates with the so-called Easyconnect system. The canister 12 has a so-called Easyconnect screw cap, which has an inner lid closure. The inner lid of the coupling device can be opened without unscrewing the closure. The person skilled in the art can learn about the functionality of the Easyconnect system, for example, from the aforementioned publications WO 2018 / 115285 A1 and WO 2019 / 094883 A1.

[0055] The Easyconnect system is a closed transfer system (CTS) for liquid crop protection products. It consists of two components: a special closure, which is already installed on the 12-litre canisters containing crop protection products (the 12 canisters can be of different shapes and sizes), and a coupling device, the so-called coupler. Fig. 1 the closure is not shown, the canister 12 is only shown schematically.

[0056] Used together, the coupling device 10 and the closure can save time and effort when filling the crop protection device. Furthermore, potential operator exposure is significantly reduced and the risk of splashes, drops, and vapors during the filling process is minimized.

[0057] The pre-assembled EasyConnect screw cap on the canister 12 containing pesticide has an integrated inner lid, eliminating the need for a sealing film. To begin dispensing liquid, the coupling device 10 opens the inner lid, allowing liquid to be drawn from the canister 12. After dispensing is complete, if the canister 12 is not yet completely empty, the inner lid is closed, and then an outer side of the inner lid is rinsed using the coupling device 10. Once the canister 12 has been completely emptied, an inner wall of the canister 12 is rinsed using the coupling device 10, after which the inner lid is closed again, and an outer side of the inner lid is rinsed or cleaned. All of these processes are completely leak-proof. No adapter is required.

[0058] The coupling device 10 secures and supports the canister. Emptying of the canister 12 is quick and convenient, directly into the crop protection device, such as a field sprayer. The removal from the canister 12 occurs either completely or as a partial amount, which is recorded by a measuring device, specifically a weighing device. The removal of liquid occurs, for example, by gravity or by suction.

[0059] During removal, rinsing, and closing, the canister 12 is securely clamped or fixed to the coupling device 10. After complete emptying, the rinsing system integrated into the coupling device 10 cleans the inside of the canister 12. During partial removal, the outside of the inner lid of the screw cap is cleaned by the integrated rinsing system, so that the canister 12 can be safely stored after removal from the coupling device 10 and is ready for the next use.

[0060] Thanks to the closed system, the liquid pesticides can be poured directly into the spray tank of the crop protection device. The screw cap remains on the canister 12 and never needs to be screwed on or off by hand.

[0061] The coupling device 10 has an outer housing 20 that is attached to the frame 14 of the field sprayer. The outer housing 20 is attached to the frame 14 by means of a single-point suspension (not shown). This allows for a low-vibration fixation of the coupling device 10. In the side view of the Fig. 1 An electric valve 22 for canister cleaning is visible. When the canister 12 is completely emptied and a cleaning lance 24 is at least partially located within the canister, the electric valve 22 can be opened and rinsing water emerges from a spray head 26 of the cleaning lance 24. Above the spray head 26, an inner lid 28 of the canister closure of the canister 12 is visible. This inner lid 28 is lifted when the cleaning lance 24 is inserted into the interior of the canister 12. In the state of Fig. 1 the canister 12 is securely fixed to the coupling device 10.

[0062] After rinsing an inner wall of the canister 12, the cleaning lance 24 is withdrawn from the canister. The inner lid 28 of the canister closure is returned to its intended position so that the canister 12 is then securely and liquid-tightly closed again. An outer side of the inner lid 28, which is in Fig. 1 The canister, which is located at the bottom and is not visible, is then cleaned using the spray head 26 or additional rinsing nozzles. The valve 22 can then be closed, and the completely cleaned and emptied canister can be released and removed from the coupling device 10.

[0063] For example, if the canister 12 is filled with pesticide, it is placed in the Fig. 1 shown position and is fixed to the coupling device 10. The cleaning lance 24 is then moved into the Fig. 1 shown position into the interior of the canister 12, whereby the inner lid 28 is also lifted off the canister closure. The removal of liquid, for example pesticide, from the canister 12 then takes place via a channel in the cleaning lance 24. If, for example, only a partial amount is to be removed from the canister 12, a removal valve is closed, the cleaning lance 24 is retracted again and the inner lid 28 is returned to its original position in the canister closure. In this case, too, the then only partially emptied canister is sealed liquid-tight. After the cleaning lance 24 is retracted, an outer side of the inner lid 28 is cleaned either by means of the spray head 26 of the cleaning lance 24 or additional rinsing nozzles.Thereafter, the fixation of the canister 12 to the coupling device 10 can be released and the canister closed by means of the inner cover 28 can be lifted off again.

[0064] In the side view of the Fig. 1 Screw bolts 30 are visible, which serve to attach a display. For example, the weight of the canister 12 can be shown on the display; the associated weighing device will be explained later.

[0065] In Fig. 1 A housing 32 of the coupling device 10 can be seen, which is suspended in the outer housing 20 of the coupling device 10, as will be described below. The canister 12 is coupled to the housing 32.

[0066] Fig. 2 shows a view of the section plane AA in Fig. 1 . The cleaning lance 24 with the spray head 26 can be seen, with the inner cover 28 arranged on the upper end of the cleaning lance 24. The canister 12 is in Fig. 2 not shown for the sake of clarity. The cleaning lance 24 extends into the housing 32. The cleaning lance 24 extends into a hollow threaded spindle 34, which in turn can be rotated relative to the housing 32. Upon rotation of the threaded spindle 34 relative to the housing, the cleaning lance 24 is either moved out of the housing 32 into the Fig. 2 shown position or in Fig. 2 downwards, into the housing 32. A guide tube 36 extends a short distance into the cleaning lance 24. Via the guide tube 36, the canister 12, cf. Fig. 1 When liquid is removed, air is supplied for venting. Water for flushing is guided in an annular space between the threaded spindle 34 and a water pipe 35, or alternatively between the inner pipe 36 and the water pipe 35 if the inner pipe 36 is directed further upward.

[0067] The coupling device 10 has a first electric motor 38, which is coupled to the hollow threaded spindle 34 by means of a chain 40. The threaded spindle 34 can be rotated by means of the first electric motor 38, whereby, as explained, the cleaning lance 24 can be moved out of the housing 32 or into the housing 32. The cleaning lance 24 can also be rotated about its longitudinal axis simultaneously with the threaded spindle 34 by means of the first electric motor 38. Rotation of the cleaning lance 24 is effected by means of a guide track 39, into which a sliding block 41 connected to the threaded spindle 34 engages. During rinsing operation, the cleaning lance 24 rotates relative to the housing 32 and thus also relative to the canister 12 fixed to the housing 32. By means of the spray head 26, which then rotates relative to the canister 12, the inner wall of the canister 12 can be thoroughly cleaned.In particular, to clean the canister 12, it does not need to be manually rotated relative to the housing 32 and the spray head 26. This eliminates the risk of the closure of the canister 12, which is fixed to the coupling device 10, being accidentally unscrewed and the contents of the canister 12 escaping uncontrollably.

[0068] By means of the first electric motor 38, the cleaning lance 24 can be displaced into and out of the canister without rotating about its longitudinal axis, for example, to separate the inner lid 28 from the canister closure or to reinsert it into the canister closure. Within the scope of the invention, the cleaning lance 24 can also be rotated merely about its longitudinal axis, for example, during a rinsing operation, without simultaneously causing the cleaning lance 24 to be advanced into or out of the canister 12. Furthermore, the cleaning lance 24 can be simultaneously rotated about its longitudinal axis and displaced in the axial direction. The displacement and rotation of the cleaning lance can, for example, also be effected directly by electric motors, not necessarily by means of the threaded spindle 34 and the guide track 39.

[0069] A second electric motor 42 is arranged in the outer housing 20 and is coupled via a chain 44 to a clamping device in the housing 32. By means of the electric motor 42, after the canister 12 has been placed on the housing, it can be clamped at its closure and thereby fixed to the coupling device 10. By means of the second electric motor 42, Fig. 2 Valve means (not shown) are opened and closed to open or close a flow connection between an inlet of the coupling device 10 and an outlet of the coupling device 10. An inlet of the coupling device 10 is located in the illustrated embodiment at the upper end of the cleaning lance 24. Openings are arranged there, which provide a connection to the interior of the cleaning lance 24. An outlet of the coupling device 10 is in Fig. 2 not visible. The valve means can, in a manner not shown, enable or interrupt a flow connection between the openings on the spray head 26 of the cleaning lance 24 and the outlet, in particular to remove liquid from the canister. Within the scope of the invention, the valve means can also be actuated independently of the electric motor 42.

[0070] The coupling device 10 has a Fig. 2 only partially indicated weighing device 46 in the outer housing 20. The weighing device 46 has three retaining bolts 48 that connect the outer housing 20 to the housing 32. In Fig. 2 only one of the retaining bolts 48 can be seen.

[0071] Fig. 3 shows the enlarged detail Z from Fig. 2 The retaining bolt 48 is one of three similar retaining bolts 48 and is provided with strain gauges in an invisible manner. The retaining bolt 48 is screwed into the outer housing 20 and protrudes at its Fig. 3 right end 50 extends beyond an inner wall of the outer housing 20. The housing 32 is placed on this end 50. As a result of the weight of the housing 32, the retaining bolt 48 or the three retaining bolts 48 are deformed. The other retaining bolts 48, which are in Fig. 2 und Fig. 3 are not visible, are arranged at the same height as the retaining bolt 48, but surrounding the housing 32 at an angle of 120° to each other. The housing 32 thus rests on the three ends 50 of the retaining bolts 48. Deformation of the retaining bolts 48 can be detected by means of the strain gauges on the retaining bolts 48. The Fig. 2 und Fig. 3 The weighing unit 46, which is only indicated schematically, can determine a weight force of the housing 32 from the measuring signal generated by the strain gauges.

[0072] As already explained, the canister 12 is coupled to the housing 32. If the canister 12 is coupled to the coupling device 10 in a full state and the canister 12 is then at least partially emptied, the weighing device 46 can be used to determine a difference in the weight of the housing 32 with the canister 12 coupled thereto between the full state and the at least partially emptied state. Consequently, the weight of a quantity of liquid withdrawn from the canister 12 can be determined by means of the weighing device 46.

[0073] The weighing device 46 is coupled to a control unit 52, wherein the control unit 52 in Fig. 3 is only indicated schematically.

[0074] The control unit 52 and the weighing device 46, with the retaining bolts 48 forming part of the weighing device 46, are arranged under a protective cover 54 of the coupling device 10 and are thus protected from liquids and dust. The protective cover 54 is easily removable for maintenance work and provides good access to the components, allowing for simple maintenance and repair. The coupling device 10 can be easily attached to crop protection equipment via pre-prepared mounting points.

[0075] In the Fig. 1 bis 3 Not shown is a protective housing for the coupling device 10. The protective housing accommodates the complete coupling device 10 and has a cover that protects the top of the coupling device 10 from contamination. When a canister 12 is to be placed on the coupling device 10, a cover of the protective housing is opened, and the canister 12 can be coupled to the coupling device 10. When the canister 12 is emptied or partially emptied and cleaned, it is removed from the coupling device 10 again, and the cover of the protective housing can be closed. Especially in the case where the coupling device 10 is attached to a field sprayer 14, the coupling device 10 can be protected from contamination during spraying and driving operations.

[0076] In Fig. 3 A display 56 is indicated in sections, which is attached to the outer housing 20 by means of bolts 30. The display 56 is connected to the control unit 52. The display is designed, for example, as a display with membrane switches, thus being dust-proof, water-proof, and liquid-proof, and can be easily operated even while wearing protective gloves.

[0077] On the display 56, for example, a manual or automatic mode can be set, a partial quantity to be withdrawn from the canister 12 can be entered, and, for example, a density of the liquid in the canister 12 can also be entered. The display 56 shows the current status of the coupling device 10, for example, a "ready for operation" status, or it can also indicate whether liquid is currently being withdrawn from the canister 12 or whether a rinsing mode is already activated.

[0078] The control unit 52 can have a wireless interface and can connect, for example, to a mobile device, such as a smartphone. The coupling device 10 can then also be controlled or supplied with data via such a mobile device, for example, by transmitting properties of the liquid in the canister 12 to the control unit 52.

[0079] On the display 56 or on the mobile unit, a cleaning time or rinsing time and / or a number of cleaning cycles can then be set via the control unit 52, for example, and the weighing device 46 can be calibrated. Using the mobile unit, such as a smartphone, a code on the canister 12 can also be recorded, and the resulting data can be transmitted to the control unit 52. This data can then also include, for example, a density of the liquid in the canister 12.

[0080] Alternatively or additionally, the coupling device 10 is provided with a code reading device so that a code arranged on the canister 12 is automatically read or an RFID chip arranged on the canister 12 can be automatically read. Removal orders can also be transmitted on the display 56 or via the mobile unit. Documentation of a removal process and / or rinsing process can also be created and transmitted, for example, from the control unit 52 to the mobile unit to document the date, time, removal quantity, order number, and / or operator of a removal process.

[0081] The display can show pictograms and, for example, the contents of the canister as well as the amount removed can be indicated in liters or kilograms.

[0082] Using the control unit 52, partial quantities drawn from different canisters can be added together and, if necessary, transmitted or displayed on the display 56. For example, if a first canister 12 is attached and completely emptied, but the desired target quantity is not yet reached, a second canister can be attached, connected, and partially emptied. The partial quantities as well as the total amount of liquid drawn—in other words, an accumulated volume—can then be displayed on the display 52.

[0083] The weighing device 46 is designed for canister sizes of the canister 12 from 1 l to 20 l. The weighing accuracy of the weighing device 46 can be specified as ± 2.5% according to ISO 21191. If the coupling device 10 is switched off or placed in standby mode, a fixing device (not shown) can, as already explained, establish a rigid connection between the outer housing 20 and the housing 32, so that, for example, during driving or spraying, the retaining bolts 48 of the weighing device 46 are not subjected to any or only excessive loads.

[0084] The weighing device 46 has a tare function so that the withdrawal quantity can be specified. The weighing device 46 and / or the control unit 52 can also have a position sensor (not shown), for example, a gyro position sensor. If the coupling device 10 is not exactly vertical during the withdrawal of liquid from a canister 12, this deviation from the vertical can be detected by the position sensor and taken into account when evaluating the signals from the strain gauge strips on the retaining bolts 48. This allows for highly precise measurements and the aforementioned high weighing accuracy to be achieved.

[0085] A connecting hose to a mixing device or a storage tank, not shown in the figures, is decoupled from the weighing unit 46 or from the housing 20 by a flexible sleeve, so that a stiffness of the connecting hose does not influence the measurement result of the weighing unit 46.

[0086] The liquid in the canister 12 can be pumped out of the canister by gravity; in the illustrated embodiment, suction from the canister 12 is provided using a vacuum of up to -1 bar. The vacuum is generated in a device (not shown) of the field sprayer 14. Flushing is carried out with clear water at a pressure of 2 bar to 10 bar.

[0087] An automatic operating mode of the coupling device 10 can be selected using the control unit 52; alternatively, a manual mode can also be selected. In manual mode, for example, the canister and its closure, in particular the inner lid 28 of the canister, are completely emptied and subsequently cleaned. The individual stages of this manual mode can be initiated and / or stopped via the display 56, but can also run automatically until the cleaned canister 12 is released.

[0088] In the automatic operating mode, particularly a fully automatic mode, the required amount of liquid, such as a pesticide, can be preselected. If the target amount is only a partial amount of the liquid contained in the canister 12, only a partial amount corresponding to the target amount is withdrawn from the canister 12 under the control of the control unit 52, and then the outside of the inner lid and the screw cap are cleaned. The process then proceeds automatically until the cleaned canister is released.

[0089] If the target quantity exceeds the contents of canister 12, several canisters are completely emptied until a partial withdrawal of the last canister is required. The withdrawn partial quantities are automatically added together by the control unit 52. Here, too, the process continues automatically until the cleaned canister is released.

[0090] Automatic cleaning of the canisters is provided. The cleaning or rinsing process begins automatically after liquid is removed from the canister. If the canister is completely emptied, the interior of the canister 12 as well as the exterior of the inner lid and screw cap are cleaned. If a partial amount is removed, the exterior of the inner lid and screw cap are cleaned, and the canister is released after cleaning.

[0091] By means of the cleaning lance 24, which can rotate about its longitudinal axis relative to the housing 32 and is driven by the first electric motor 38, an efficient and rapid internal cleaning of the canister 12 can be achieved. In the illustrated embodiment, the spray head 26 rotates 180°, and an up-and-down movement of the spray head 26 relative to the housing 32 is possible. The angle of rotation of the cleaning lance 24 with the spray head 26 and a travel path or displacement path relative to the housing 32 can be freely programmed by the control unit 52. In this way, a cleaning program can be optimally adapted to different canister shapes and sizes. The electric motors 38, 42 can be designed as stepper motors.

[0092] The spray head 26 is optimized to reach and thoroughly clean problem areas in the canister, such as the canister neck, canister bottom, and canister ribs. The high impact of the spray jets emitted from the spray head 26 ensures thorough cleaning of the canister bottom, for example, to remove sediment. The duration of the rinsing process is selectable and can be adjusted to the level of residue in the canister.

[0093] With the coupling device according to the invention, the following completely automatic process steps can be carried out after the canister has been placed on the coupling device 10: First, the canister 12 is placed by hand on the coupling device 10 and then fixed to the coupling device 10 by rotating the second electric motor 42.

[0094] Subsequently, by rotating the first electric motor 38, the cleaning lance 24 is moved upwards, towards the canister 12, whereby the inner lid 28 of the canister closure is lifted and moved together with the cleaning lance 24 into the interior of the canister 12.

[0095] The canister 12 can then be completely emptied by the valve means of the second electric motor 42 opening a flow connection between the inlet of the coupling device 10 and the outlet of the coupling device 10. Following complete emptying of the canister 12, its interior is cleaned, and after the interior of the canister 12 has been cleaned, the screw cap and the outside of the inner lid 28 of the canister 12 are also cleaned.

[0096] If only a portion of the liquid in the canister 12 is removed, the outside of the inner lid and the screw cap of the canister are cleaned after the inner lid 28 of the canister 12 is closed.

[0097] After each cleaning, the canister is closed using the inner lid 28, and the second electric motor releases the canister 12 from the coupling device 10. The canister 12 can then be lifted off the coupling device 10.

[0098] The 12 V electric motors 38, 42, the weighing device 46, and the control unit 42 are supplied with power from 12 V to 24 V via a cable connection and plug connection. For example, a power supply for the field sprayer 14 is used.

[0099] The coupling device 10 has a separate water connection for rinsing water. A separate connecting hose leads to a mixing device or to a storage tank of the field sprayer 14.

[0100] With the coupling device according to the invention, the workflows for coupling, emptying, cleaning, and uncoupling a canister, especially a canister containing pesticide, can be carried out automatically. This largely prevents operating errors and the resulting hazards to the environment and the operator.

[0101] Fig. 4 shows a coupling device 110 according to a further embodiment of the invention from an oblique top view. The coupling device 110 is similar to the coupling device 10 of Fig. 1 bis 3 structured so that only the different features are described.

[0102] In Fig. 4 the display 56 can be seen, via which an operator can operate the coupling device 110 and, for example, trigger fully automatic processes.

[0103] The coupling device 110 is in Fig. 4 provided with the protective cover 54. Furthermore, a protective housing 55 can be seen in the area below the display 56. Water, for example from a water tank of a field sprayer, is supplied to the coupling device 110 via a hose 112 in order to Fig. 4 not shown canister 12, see Fig. 1 , to be able to rinse.

[0104] Via a connection 114, the canister 12, see Fig. 1 , withdrawn liquid, for example pesticides, is discharged from the coupling device 110.

[0105] Fig. 5 shows a sectional view of the coupling device 110 of the Fig. 4 . A threaded spindle 134 can be seen, within which a ventilation tube or inner tube 136 is guided to the spray head 126. When liquid is drawn from a canister 12, air is supplied to the interior of the canister 12 via the inner tube 136 in order to vent the canister 12. The hose 112 is not connected to the inner tube 136. Rather, the hose 112, through which water is supplied to rinse the canister, is connected to an annular space 135 between an inner side of the threaded spindle 134 and an outer side of the inner tube 136. Water is guided from the hose 112 to the spray head 126 via this annular space.

[0106] The inner tube 136 is open to the environment at its lower end.

[0107] In the sectional view of the Fig. 5 The electric motors for moving and rotating the cleaning lance 124 are not visible. However, the threaded spindle 134 is accommodated in a threaded nut 138, which in turn is provided with a sprocket wheel driven by one of the two electric motors 138 via a chain 140, see Fig. 11 . A rotation of the threaded nut 137 leads, starting from the state of the Fig. 5 to an upward movement of the threaded spindle 134. At its lower end, the threaded spindle is connected to an end piece, which engages in a guide track 139 by means of two sliding blocks 141. The guide track 139 is provided in a hollow cylinder. The sliding blocks 141 are designed as pivot bearings, in particular ball bearings. An electrical encoder 143 is provided on the end piece. By means of the encoder, a position of the end piece is transmitted to a Fig. 5 control unit (not shown). As soon as a signal is sent from the encoder 143 to the control unit that the end piece or the threaded spindle 134 has reached a predetermined end position or intermediate position, the electric motor 138, which is designed as a stepper motor, is stopped.

[0108] The electric motor 138 thus rotates the threaded nut 137 and thereby moves the threaded spindle 134 up or down. The displacement movement of the threaded spindle 134 is determined by the pitch of the external thread of the threaded spindle 134 as well as by the course of the slide track 139. Fig. 5 It can be seen that starting from a lower end of the slide track 139, in which Fig. 5 the sliding blocks 141 are arranged, the cleaning lance 124 is initially moved straight upwards when the electric motor rotates. This allows the cleaning lance 124 to be used, as can be seen from the Fig. 1 bis 3 described, an inner lid 28 of the canister 12 can be lifted off and the cleaning lance can be positioned in the interior of the canister, cf. Fig. 1 to remove liquid from the canister 12. If the canister 12 is only partially emptied during the removal of liquid, the electric motor 138 rotates the threaded nut 137 in the opposite direction, so that the threaded spindle 134 is moved downward again until the inner lid of the canister closure is closed again.

[0109] Once the canister is completely emptied, the nut 137 is rotated further by the electric motor 138, so that the sliding blocks 141 continue to move along the sliding track 139 and reach the helical section of the sliding track 139. With only a slight advance, the cleaning lance, and in particular the spray head 126 of the cleaning lance, rotates within the canister. At the same time, rinse water is supplied via the hose 112 so that the interior of the canister can be rinsed. After completion of the cleaning of the canister, the threaded nut 137 is rotated in the opposite direction by means of the electric motor 138, so that the threaded spindle 134 together with the cleaning lance 124 rotates back along the helical section of the slide track 139 and is then retracted downwards again by means of the following straight section of the slide track 139 until the slide blocks 141 and the cleaning lance 124 reach the Fig. 5 have reached the position shown, in which the inner lid of the canister closure is closed again.

[0110] Fig. 6 shows the sectional view of the Fig. 5 again on a reduced scale, with two details A, B each drawn by means of a circular line.

[0111] Detail A from Fig. 6 is enlarged in Fig. 7 Shown is the end piece to which the threaded spindle 134 is connected, as well as sections of the sliding blocks 141 designed as ball bearings, which engage in the sliding track 139, which is also only shown in sections.

[0112] It can be seen in Fig. 7 further, the annular space 135 between an inner side of the threaded spindle 134, the inner side of which is also provided with a lining 145, and the outer side of the inner tube 136. In this annular space 135, flushing water, which is supplied via the hose 112, is conveyed to the spray head 126. The inner tube 136 serves, as already explained, to vent the canister 12 when withdrawing liquid.

[0113] Fig. 8 shows detail B from Fig. 6 . The coupling device 110 has a Fig. 5 and Fig. 6 only partially recognizable weighing device, whereby this weighing device is in principle already based on the embodiment of the coupling device 10 of the Fig. 1 bis 3 The weighing device comprises a frame, a housing or a chassis with radially outwardly extending crane arms 150. These crane arms are in the region of their radially outer end, see Fig. 8 , mounted on rubber buffers 152. These rubber buffers 152 are provided for cushioning vibrations during the weighing process, for example, for cushioning vibrations that occur due to pump operation during the weighing process and thus during the removal of liquid from the canister 12.

[0114] The weighing device preferably has three crane arms 150, each spaced 120° apart and projecting radially outward.

[0115] Fig. 9 shows a partial sectional view of the coupling device 110 of the Fig. 5 . Only the upper section of the coupling device 110 is cut, with the cutting plane in Fig. 9 different than in Fig. 5 and 6 and in particular through the display 56, see also Fig. 4 . In Fig. 9 A circular line is drawn and labeled C. The detail C from Fig. 9 is in Fig. 10 shown enlarged.

[0116] Fig. 10 shows that the chassis, housing or frame of the weighing device is further provided with a section 155. The section 155 projects radially outwards and is received between a first stop 156 and a second stop 158 on the outer housing. The section 155 is spaced from the Fig. 10 lower stop 156 and also at a distance from the Fig. 10 upper second stop 158. The stops 156, 158 do not influence a slight movement of the frame of the weighing unit and thus of the section 155 during a weighing process. As already shown in the Fig. 1 bis 3 As explained, the weighing device is measured by slightly deforming or relieving the load on retaining bolts with strain gauge strips. Such movement of the weighing device frame does not affect the stops 156, 158, as they are arranged at a distance from section 155.

[0117] Only during operation of a field sprayer or in the event of significant vibrations of the coupling device 110 can severe deformations or temporary bending of the retaining bolts of the weighing device occur, causing the frame of the weighing device to move up and down more than is the case during weighing operation. In such a case, the sections 155 can then strike the first stop 156 or the second stop 158, thus preventing excessive bending of the retaining bolts with the strain gauge strips. This reliably prevents plastic deformation of the retaining bolts with the strain gauge strips. Such permanent or plastic deformation of the retaining bolts would influence the measurement result of the weighing device.

[0118] Fig. 11 shows the coupling device 110 of the Fig. 5 in the uncut state from diagonally above and with the protective cover 54 and the lower protective housing 55 removed.

[0119] It can be seen in Fig. 11 that the hose 112 for supplying flushing water does not end concentrically at the end piece at the lower end of the threaded spindle 134, but rather laterally thereto. The open end of the inner tube 136 can be seen centrally at the end piece. If the end piece is moved upwards together with the threaded spindle, the hose 112 can follow, since it is guided over its Fig. 11 The U-shape that can be seen has a sufficient length for this.

[0120] It can be seen in Fig. 11 further the hollow cylinder with the slide track 139 and one of the sliding blocks 141.

[0121] By means of the electric motor 138, as already shown in the Fig. 5 explained, a sliding movement and rotational movement of the cleaning lance 124 is effected and controlled.

[0122] Fig. 11 reveals a second electric motor 142, which is provided in the upper area of ​​the coupling device 110. The electric motor 142 drives a gear wheel via a chain, by means of which a canister 12, see Fig. 12 , can be coupled and uncoupled. After the canister 12 has been manually placed on the coupling device 110, as already described, the electric motor 142 is rotated and a suitable locking device is rotated by means of the chain and gear to securely and fluid-tightly lock the canister 12 to the coupling device 110.

[0123] The second electric motor 142 can also be used to control valves for withdrawing liquid from the canister. However, within the scope of the invention, the valves can also be controlled separately, for example, by means of a central control unit that also controls the electric motors 138, 142 and the weighing device. For example, electric valves, solenoid valves, or the like can be used.

[0124] Fig. 12 shows the coupling device 110 of the Fig. 11 in a view obliquely from above. The upper end of the spray head 126 of the cleaning lance 124 can be seen, see. Fig. 5 Also visible is the electrical encoder 143, which provides the control unit with a signal indicating the position of the cleaning lance 124 relative to the outer housing of the coupling device 110. Another encoder 160 can be seen in the upper area of ​​the coupling device 110. The encoder 160 signals the position of the locking device for the canister to a control unit, allowing the control unit to appropriately control the second electric motor 142.

[0125] Fig. 12 and Fig. 11 also reveal a part of the frame or housing of the weighing unit 146. The weighing unit 146 has already been explained, in particular with reference to the embodiment of the coupling device 10 of the Fig. 1 bis 3 .

[0126] To withdraw liquid, for example, pesticide, from a canister 12 using the coupling device 110, the user places the canister with the closure lid onto the coupling device 110. The initial weight is then measured using the weighing device 146. Via the display 56, see Fig. 4 The user enters the amount of liquid to be withdrawn. If necessary, the user enters the target amount of liquid in liters or milliliters. The control unit then calculates the weight in kilograms of the desired target amount based on the target amount and a density value that is also entered, or a density value that is automatically read in or known to the control unit.

[0127] The valves for withdrawing liquid from the canister 12 are then opened, while the weighing device 146 continues to record the weight of the canister 12 or the weight difference between the measured initial weight and the current weight. The desired target quantity can then be approached by opening and closing the withdrawal valve, possibly with the time intervals between opening and closing the valve decreasing as the target quantity is approached. After the desired target quantity is reached, the target quantity being achieved by the weighing device 146 recording the previously calculated weight of the target quantity as the weight difference between the initial weight and the current weight, the withdrawal valve is then closed.

[0128] The cleaning lance 124 is then inserted into the Fig. 12The canister 12 is retracted to the position shown, closing the inner lid of the canister closure. The outer side of the lid of the canister 12 can then be rinsed. After rinsing, the control unit releases the canister lock on the coupling device 110 by means of the second electric motor 142, and the user can remove the canister again.

[0129] The described processes run fully automatically after the canister has been placed and the desired target quantity has been entered.

[0130] Alternatively, after placing the canister in place, it is entered on the display 56 that the entire contents of the canister are to be removed and, consequently, no dosing should take place. Once the canister is empty, which is detected by the weighing device 146 because no weight difference results from successive weighing processes despite the removal valve being open, the interior of the canister is automatically cleaned by the spray head 126 and, as already described, the outside of the canister closure is also cleaned. After the canister has been cleaned, the canister lock is released again.

[0131] If an entered target quantity is so large that it exceeds the contents of a canister, a canister placed on the coupling device 110 is completely emptied, then cleaned, and rinsed in the area of ​​the outside of its container lid and then released again. The control unit retains the partial quantity removed from the canister and shows it, for example, on the display. The display can then prompt the user to attach another canister, from which only a partial quantity is then removed fully automatically. Once the target quantity is then reached, the last canister, from which only a partial quantity was removed, is closed in the manner described, rinsed in the area of ​​the outside of its lid and then released again.

[0132] With the coupling device 110 according to the invention, contamination of a user is largely avoided and incorrect dosages, in particular of plant protection products, are also avoided.

Claims

1. Coupling device for canisters, in particular for canisters with an inner lid closure for a closed transfer system for plant protection products and / or liquid fertilizers, comprising a housing with an inlet for coupling an outlet opening of a canister, with an outlet for connecting to a mixing device and / or a storage tank, with valve means for opening and closing a flow connection from the inlet to the outlet, and with a cleaning lance, wherein the cleaning lance can be inserted into the canister when the canister is coupled, characterized in that the cleaning lance is rotatable about its longitudinal axis relative to the housing and in a state in which it is at least partially inserted into the canister.

2. Coupling device according to claim 1, characterized in thata first actuator, in particular an electric motor coupled to a threaded spindle, is provided to displace the cleaning lance relative to the housing and / or to rotate the cleaning lance relative to the housing about a longitudinal axis of the cleaning lance.

3. Coupling device according to claim 1 or 2, characterized in that a slide track is provided to move and / or rotate the cleaning lance relative to the housing.

4. Coupling device according to claim 3, characterized in that a threaded spindle and at least one sliding block connected to the threaded spindle is provided, which is received in the sliding track.

5. Coupling device according to at least one of the preceding claims, characterized in that a second actuator, in particular an electric motor, is provided to fix a canister attached to the coupling device and to actuate the valve means.

6. Coupling device for canisters, in particular according to one of the preceding claims, in particular for canisters with an inner lid closure for a closed transfer system for crop protection agents and / or liquid fertilizers, with a housing with an inlet for coupling an outlet opening of a canister, with an outlet for connecting to a mixing device and / or a storage tank, with valve means for opening and closing a flow connection from the inlet to the outlet, and with a cleaning lance, wherein the cleaning lance can be inserted into the canister in the coupled state of the canister, characterized in that a weighing device is provided for detecting a weight of the canister in the coupled state.

7. Coupling device according to claim 6, characterized in that the weighing device has at least one retaining bolt provided with strain gauges.

8. Coupling device according to claim 7, characterized in thatthe housing is connected to the outer housing by means of at least one retaining bolt.

9. Coupling device according to one of claims 6 to 8, characterized in that a first stop and a second stop are provided on the outer housing, wherein a portion of the weighing device is arranged between the first stop and the second stop, wherein the portion is arranged at a distance from the first stop and at a distance from the second stop in order to limit movement of the support portion of the weighing device relative to the outer housing to a travel range between the first stop and the second stop.

10. Coupling device according to at least one of claims 6 to 9, characterized in that the weighing device is connected to the outer housing by means of elastic buffers.

11. Coupling device according to one of claims 6 to 10, characterized in thatthe weighing device has three load cells, in particular three retaining bolts provided with strain gauges, wherein in particular the weighing device has three retaining bolts provided with strain gauges and wherein the three retaining bolts are arranged on an imaginary circular line and at an angle of 120 degrees to one another.

12. Coupling device according to at least one of claims 6 to 11, characterized in that an electronic control unit coupled to the weighing device is provided, wherein in particular the control unit is coupled to the valve means in order to open or close the valve means between the inlet and outlet as a function of measured values ​​of the weighing device, wherein in particular the control unit is designed, in particular by means of software running on the control unit, to stop a withdrawal of liquid from the canister when a target amount for the withdrawal of liquid from the canister is reached.

13. Coupling device according to claim 12, characterized in that the control unit is designed, in particular by means of software running on the control unit, to add up partial quantities of liquid taken successively from several canisters.

14. Coupling device according to one of claims 12 to 13, characterized in thatthe control unit is designed, in particular by means of software running on the control unit, to calculate a volume of a withdrawn amount of liquid by means of at least one measured value of the weighing device and a stored or read-in density of the withdrawn liquid, wherein in particular the control unit is designed, in particular by means of software running on the control unit, and / or has means, in particular a reading device for a code, to automatically read properties of a liquid in a coupled canister, in particular density, into a memory of the control unit, in particular by means of a code reading device.

15. Coupling device for canisters, in particular according to one of the preceding claims, in particular for canisters with an inner lid closure for a closed transfer system for crop protection agents and / or liquid fertilizers, with a housing with an inlet for coupling an outlet opening of a canister, with an outlet for connecting to a mixing device and / or a storage tank, with valve means for opening and closing a flow connection from the inlet to the outlet, and with a cleaning lance, wherein the cleaning lance can be inserted at least partially into the canister in the coupled state of the canister, characterized in thata control unit and at least one actuator are provided to carry out the coupling of the canister, the removal of liquid from the canister, the rinsing of an interior of the canister and / or an exterior of a closure of the canister, and / or the uncoupling of the canister automatically, in particular by means of software running on the control unit.

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