FI61389C - VAETSKEFOERDELNINGSVENTIL FOER EN SPRUTA FOER BEKAEMPNINGSMEDEL - Google Patents

Description

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The present invention relates to a liquid distribution valve for a pesticide sprayer, the distribution valve comprising a body having an inlet to be connected to the pesticide tank and a connection to the sprayer boom. The return point 10, which are connected to each other by flow channels, and a closure mounted on the body, optionally connecting the entry point to the supply points or return point, and an ejector mounted in the duct in the duct between the entry point and the return point. the duct terminates to develop a vacuum in said duct.

For the application of pesticides in agriculture and forestry, it is previously known to use pesticide sprayers mounted behind a tractor or other vehicle, which are provided with two spray booms which can be pivoted by means of pressure actuators between the raised transport position and the sprayer folded down on both sides of the tractor. The spreading nozzles in the sprayer booms are connected to the pesticide tank via pipelines via 25 pumps. A liquid distribution valve is installed in the piping, with which the connection of the nozzles to the tank can be opened and closed, respectively, when spraying is started and, respectively, stopped.

For this purpose, the liquid distribution valve is provided with an inlet connected to the Tor-30 sealant tank, which is connected by a channel to the supply points connected to the spray boom piping to supply the pesticide by means of a pump to the spray booms. The liquid distribution valve is further provided with an ejector connected by various channels to said inlet on the one hand and to said inlets on the other hand so that when the flow of pesticide supplied by the pump is controlled by connected to the pesticide container, a vacuum is created at said supply points by the action of the ejector, so that the pesticide remaining in the syringe booms is sucked back into the pesticide container via said return connection.

The disadvantage of currently used sprayers is that when the spraying is stopped, the sprayer booms are not always turned to a vertical position, so that the pesticide, which must remain in the sprayer boom even after closing the shut-off valves, despite the ejector effect described above, can run into the terrain. causes a hazard. This danger cannot be avoided by currently known liquid distribution valves.

The object of the present invention is to provide a liquid distribution valve which, when used in a sprayer, eliminates this drawback and which allows the automatic discharge of the pesticide remaining in the sprayer booms despite the ejector effect reliably back to the pesticide tank after spraying. This object is achieved by a liquid distribution valve according to the invention, which is characterized by a connection on the outlet side of the ejector for discharging a vacuum for operating the actuators of the spray booms after the spraying has ended.

The invention is based on the idea that the vacuum generated by the ejector effect provided by the liquid distribution valve is utilized to provide not only said backflow but also a starting pulse for the spray boom actuators.

In this case, the pesticide, which, despite the ejector effect of the liquid distribution valve, still remains in the spray booms, flows back into the tank, and the few drops that remain in the nozzles 35 drip onto the vehicle's tramline. In this way, the disadvantage described above is eliminated, as well as the fact that the sprayer would have to stop the vehicle, come out of the cab and manually place the sprayer booms in the transport position, exposing the worker himself to the pesticide.

The vacuum pulse 5 obtained from the liquid distribution valve according to the invention can be applied to the operating valve of the spray boom actuators to set it in the spray boom up position or to another control or operating unit or booster using the actuators.

The invention will be explained in more detail below with reference to the accompanying drawing, in which Figure 1 schematically shows a preferred embodiment of a liquid distribution valve according to the invention connected to a pesticide sprayer operating circuit, the valve in the spray position, and Figure 2 shows the liquid distribution valve in the empty position.

The drawing shows a liquid distribution valve 1 with an inlet 2 connected to a pesticide tank 3 mounted on a tractor or other vehicle. The inlet 20 is connected by a channel 4 to two supply points 5, each connected to its own sprayer boom 6, which is also mounted on the tractor. which can be pivoted in the transverse vertical plane of the tractor between the raised transport position I and the lowered spraying position II 25 by means of hydraulic actuators 7. The valve also has a liquid return point 8 connected to the pesticide tank 3. The return point is connected to 10. The return point is also connected by a channel 11 to the supply points 30 5, this channel ending on the outlet side of the ejector.

The valve is provided with a shut-off 12, by turning which optionally a flow connection is established from the inlet point 2 to the supply points 5, as shown in Fig. 1, or from the inlet point 2 to the return point 8, at the same time opening the connection 35 from the supply points to the return point. By means of the switch indicated by reference numeral 13, it is possible to connect the input channel 4 optionally either to both input points 5 or only to one of the two input points or to completely close the connection of the input channel to the input points.

According to the invention, an outlet point 14 is formed at the ejector, which terminates on the outlet side of the ejector within the vacuum range generated by it. The outlet point is connected to the control member 16 of the drive valve 15 controlling the operation of the actuators of the spray booms, as will be explained in more detail below.

The pesticide supply pump is denoted by reference numeral 10 and the actuator hydraulic pump is denoted by reference numeral 18. Reference numeral 19 denotes a safety valve which discharges the liquid back into the tank if the closure 12 is in such a position that it does not allow liquid to enter in any direction.

15 The fluid distribution valve works as follows:

When spraying the pesticide is started, the sprayer booms are lowered to the lowered spraying position II by means of the actuators 7 using the operating valve 15 either manually or by remote control. The connection 20 is then opened from the inlet point 2 of the liquid distribution valve to the supply points 5 by setting the closure 12 either manually or by remote control to the position shown in Fig. 1. The pesticide pump now pumps the pesticide from the tank to the spray nozzles of the sprayer booms.

When the spraying is stopped or interrupted, the shutter 12 is set to the position shown in Fig. 2, whereby the connection from the inlet point 2 to the supply points 5 is closed and the connection of the inlet point to the reset point 8 is opened. The pesticide pumped through the ejector 10 creates a vacuum in the channel 11, as a result of which the pesticide in the spray booms and their piping is sucked back into the tank through the channel 11 and the return point 8. At the same time, a vacuum is also generated in the outlet 14, which provides an impulse in the control element 16 of the actuator valve 15 of the actuators 7 such that the actuator valve 15 is set to a position where the hydraulic actuators turn the sprayer booms up to the transport position. In this case, the pesticide remaining in the sprayer booms and piping flows back into the tank 3.

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When the spraying is started again, the connection of the channels 11 and 9 to the inlet point 2 is closed by a shutter 12, whereby the vacuum ceases at the outlet point 8 and the actuator drive valve is ready for a further lowering of the sprayer booms.

It is noted that with the liquid distribution valve according to the invention, the sprayer booms are automatically raised to a transport position, where any pesticide left in them is caused to drain back into the tank. This avoids the pesticide entering unwanted areas.

Claims (2)

61 ^ 89 Claims o Ό 7 A liquid dispensing valve for a pesticide sprayer, the dispensing valve (1) comprising a body having an inlet point (2) to be connected to the pesticide container (3) and supply points (5) to be connected to the piping of the sprayer booms (6) and a return point to be connected to the pesticide container (8) connected to each other by flow channels (4, 9, 11) and a frame-mounted closure 10 (12) optionally connecting the inlet to the inlet or return point, and to the duct between the inlet and return point (9). ), an ejector (10) mounted on the discharge side of which a channel (11) leading from the supply points terminates in said channel for generating a vacuum, characterized by a connection (14) on the discharge side of the ejector 15 (10) for evacuating the actuators (7) of the sprayer booms (6). the end. A liquid distribution valve for a pesticide sprayer according to claim 1, the sprayer comprising two sprayer booms (6) pivotally mounted on a base in a vertical plane, pressure medium actuators (7) for turning the sprayer booms between a raised position (I) and a lowered position (II) and a pesticide tank (3) for supplying pesticide to the booms via the distribution valve (1), characterized in that the vacuum outlet connection (14) is connected to the control element (16) of the operating valve (15) of the actuators (7) of the booms (6) so that the operating valve actuates the actuators turn the sprayer booms to the vertical position when the ejector effect of the distributor valve starts.