FR2634351A1 - AGRICULTURAL SPRAYER, WHOSE FLOW IS VARYING ACCORDING TO TRACTOR SPEED AND LIQUID LEVEL IN THE LIQUID RESERVOIR - Google Patents

Abstract

a) Agricultural sprayer whose output varies according to the speed of the tractor and the level of the liquid in the liquid tank. b) Sprayer characterized in that the passage valve 16 upstream of the agitation line 6 is capable of being adjusted or controlled as a function of the filling level of the tank 1 so that when the tank 1, the line of stirring 6 receive more fluid than when the tank 1 is emptied so that the stirring power supplied by the pipe 6 is reduced when the tank 1 is emptied.

Description

"Agricultural sprayer whose flow varies according to

  tractor speed and fluid level

in the liquid tank. "

  The present invention relates to spraying

  agricultural machine comprising a liquid reservoir, a pump, a metering valve, a return line and a stirring line opening into the reservoir, the stirring line comprising

  - upstream, an adjustable passage valve.

  Such an agricultural sprayer is known for example according to an advertising document of the company RAU bearing the imprint SP 15 dt. 40 VI VA / 5.84. In this known sprayer, we put in

  stirrer is cut or cut by inverting a

  net inverter of a pre-setting device which allows to completely cut the agitator device

  when there is very little liquid in the

  see to liquid so that very small amounts

  residuals remain in the tank. He is also

  possible, in the case of spray products that generate a lot of foam, to shake

reduced pressure.

  However, a disadvantage of such sprays

  It is known to have only all or a small portion of the stirring power (in the case of foam generating agents) or even to have no stirring power at all. for a complete stirring power and a very small amount of liquid, this liquid is too strongly agitated in the tank. In each case, the stirring power remains constant during dispensing until the complete shutdown

  agitator device so that the effect of stirring

  becomes too important when the reservoir is

empty.

  The object of the present invention is to create simple means making it possible to optimize the action of stirring devices in the case of

agricultural sprayers.

  For this purpose, the invention relates to an agricultural sprayer characterized in that the flow valve upstream of the stirring pipe can be adjusted or controlled according to the

  filling level of the tank so that

  that the tank, the agitating pipe receive more fluid than when the tank empties so that the stirring power provided by the pipe

  reduced when the tank empties.

  Thanks to these means, we arrive ex-

  very simple to reduce the stirring power to maintain this constant agitation so that

  the intensity of the agitation is constant during

  the duration of distribution, for any level of

liquid in the tank.

  In the simplest way, it is thus possible to adjust, control or adjust the valve of

  passage upstream of the stirring line, manually

  continuously, or stepwise, to continuously adapt the stirring power at the

liquid in the tank.

  It is preferentially provided to control, or adjust or adjust the passage valve by an automatic device that detects or calculates the actual filling level of the reservoir. The stirring intensity is thus automatically adjusted to the filling level of the tank so that the stirring intensity is automatically maintained at a constant level. It is also possible to associate a

  tank sensor to detect the level of

  pleating, sensor that controls or regulates the flow valve. The sensor may be a mechanical sensor,

  electrical or electronic or other. As an example

  If it is possible to measure the level using an ultrasonic sensor, the information is then transmitted to the device that controls the valve.

of passage.

  In addition, according to the invention, in another embodiment, there is provided on the sprayer an electronic dosing installation comprising a flow meter and an electronic calculator which measure the quantity actually distributed, which the calculator determines from the initial quantity. contained

  in the tank and the amount of liquid dispensed

  steam to obtain the amount that remains in the tank.

  see and depending on this quantity, adjust the flow valve back to reduce the stirring power accordingly. In this embodiment, the stirring power is adjusted to the level of

filling the tank.

  According to another embodiment, it is provided that, by adjusting the flow valve upstream of the stirring line, the dosing valve is adjusted at the same time in order to keep the quantity of liquid to be dispensed constant. This is how

  the simplest that the quantity to be distributed is

  constant holding so that the variation of the stirring power does not affect the quantity to be dispensed. In the case of an agricultural sprayer

  with a pressure line from the pump

  In the case of the dispensing nozzles via the dosing valve, it is provided according to the invention to have a bypass in the pressure line for the return line, the line comprising the passage valve as a two-way slide valve. channels and connected in parallel to the agitation pipe on the passage valve with a bypass line opening into the tank or

  in the suction line leading to the pump.

  This results in the important advantage that when the amount of liquid supplied to the stirring line changes, the dispensed quantity does not change so that it is not necessary to slave the tap to

dosage.

  In the case of an agricultural sprayer

  liquid tank, the pump with a dosing

  In this case, the return and stirring duct leading to the liquid reservoir is derived from a return line from the dosing valve and transferring

  the amount of surplus liquid supplied by the

  In order to return it to the liquid reservoir, it is provided according to the invention that the return pipe opens exclusively into the suction pipe.

  connecting the tank to the pump. The result is the

  important that the residual quantity decreases

  up to zero ie the pump can practically

empty the tank.

  It is furthermore provided according to the invention that the return duct opens upstream of the filter in

  the suction line when using the direction

  suction and passage. In this way, and in the simplest way and without having to provide additional reversing valves, the level of the liquid is restored by the pump drawing from a pump.

liquid tank.

  It is provided according to one embodiment

  preferential to have a gate valve in the con-

  pressure and that the agitating line

  ve of the passage valve. This results in the important advantage that, independently of the central switch of the dosing valve, it is possible to operate the

stirring medium.

  It is further provided according to the invention that the metering valve comprises a filter capable of being rinsed with an adjustable valve between the valve

  regulating the quantity dispensed on the dosing

  ge and distribution lines, and in that

  outlet of this valve associated with the filter has been

  the stirring line, this valve being adjusted or controlled according to the level of filling of the tank. This makes it possible to use in the simplest way the filter return flush stream

  for the stirring medium and the intensity of the stirring

  adapting to the filling level of the tank

  by the associated valve or the valve downstream.

  The present invention will be described in a manner

  re more detailed with the aid of the accompanying drawings in which: - Figure 1 shows schematically

  the connection of the different lines of a pulveri-

agricultural user.

  - Figure 2 shows schematically

  the connection of the different lines of a pulveri-

agricultural user.

  FIG. 3 schematically shows another mode of connection of the different pipes.

of an agricultural sprayer.

  - - Figure 4 shows another connection variant. - Figure 5 shows schematically

another variant.

  - Figure 6 shows another connection variant. The agricultural sprayer according to Figure 1 consists of a liquid reservoir 1, a pump 2, a pressure control valve 3, a metering valve 4, a return line 5, d 1 at the bottom of the liquid tank 1 the suction line 8 is connected with the filter 9 leading to the pump 2. From the pump 2, the pressure line 10

  leads to the pressure regulator banana 3 and to the

  metering binet 4. Pump 2 is driven in such a way

  known, not shown in detail, from the

  by force of a tractor. Pump 2 sucks the liquid

  to be sprayed via the suction line 8 and the filter 9 from the liquid tank 1; this liquid is repressed by the conduct of

  pressure 10 leading to the pressure regulating valve

  3. Depending on the spray pressure set by the adjusting screw 11, which is read on the pressure gauge 12, the spray liquid is supplied.

  in a determined quantity, in known manner, by the

  of the metering valve 4, provided for a

  triple width, to the lines 7 of the spray nozzles

  13, pipes connected to the tap 4. The excess amount of liquid transferred by the pump 2 and the pressure line 10 to the pressure control valve 3 is transferred via the return line 5 connected to the pressure control valve 3 back to the liquid tank. The return line 5 opens at point 14 in the liquid tank 1 at the inlet of the suction line joining the pump 2. The point 14 at which the return line 5 opens into the suction line 8 is in

  upstream of the filter 9 with respect to the suction direction

  tion and passage 15 so that the conduct of

  return 5 opens upstream of the filter 9 in the direction

  suction point 8 with respect to the suction direction and

of passage 15.

  The agitation pipe 6 is connected to the metering valve 4. The agitation pipe 6 is preceded by the adjustable flow valve 16. This

  valve 16, upstream of the pipe 6, can be controlled

  and set continuously or in several increments by the handle 17 so as to reduce the stirring power of the pipe 6 when the tank empties. To do exactly this adjustment of the passage valve 16, manually by the handle 17, the tractor comprises the display device 18 connected by the cable 19 to the sensor 20 detecting the level of

  filling. The respective filling level of the

  1 is indicated by the sensor 20 and the cable 19 to the display device 18 so that the level of the liquid is then displayed by the device 21. According to this display, the handle 17 regulates the passage valve 16. valve 16, upstream of the stirring pipe 6, is set or controlled by

  function of the level of the liquid contained in the

  see 1 and that so that when the reservoir 1 is filled, the agitation pipe 6 receives a

  greater amount of liquid than when

  1 is emptied so as to reduce the stirring power exerted by the pipe 6 as the

tank 1 is empty.

  Partial width shutoff valve

  22 which cuts off the various spray pipes

  6 is upstream of the different lines on the metering valve 4 so as to reduce the width of the

  spray. When cutting the different driving

  7, the vein of liquid supplied to the spray lines 7 is transmitted by the

  line 23 to the return line 5.

  The agricultural sprayer according to Figure 2 also comprises a reservoir 1, a pump 2, a pressure control valve 3, a metering valve 4, a return line 5, a stirring line 6 and spray lines 7 The suction line 8 with the filter 9 is connected to the bottom of the tank to reach the pump 2. The pressure line 10 from the pump 2 is connected to the pressure control valve 3 and the metering valve 4 The pump -2 is driven in a known manner, not shown in detail, from the PTO of a tractor. The pump 2 draws the liquid to be sprayed through the suction pipe 8 and the filter 9 from the tank 1 to discharge this liquid through the pressure line 10 to the pressure adjustment valve 3. Depending on the pressure spray rate adjusted by adjusting screw

  11, which is read on the pressure gauge 12, it is

  the desired quantity of liquid, in known manner, via the metering valve 4, provided for a triple width, by the pipes 7

  connected to the tap 4 and going to the spray nozzles

  The excess liquid quantity supplied by the pump 2 and the pressure line 10 to the pressure control valve 3 is returned via the return line 5 connected to the valve 3 to the liquid tank. The return line 5 opens at point 14 in the suction line connecting the

  2. At point 14, where the

  return 5 leads to the suction line.

  8, is located upstream of the filter 9 with respect to the direction of suction and passage 15 so that the

  return line 5 opens into the vacuum line

  ration 8 upstream of filter 9 if we refer to the

  Suction and flow direction 15.

  In addition, the agitation pipe 6 is connected to the metering valve 4. The passage valve 24 is upstream of the stirring pipe 6. The passage valve 24, upstream of the pipe 6, is adjustable

  (can be ordered) and can be adjusted continuously or

  several levels by a telecommunication

  Mande realized in the form of an electric motor 25 to reduce the stirring power of the pipe 6 when the tank empties. To accurately perform this adjustment of the passage valve 24 by the electric motor 25, the latter is connected to the control device 26 by the cable 27. The control device 26 and the cable 28 are connected

  the sensor 20 which detects the state of filling.

  The respective filling state of the tank 1 is indicated by the sensor 20 and the cable 28, the control device 26 and the latter can display the level of the liquid by the display means 29. Depending on the filling level of the liquid to spray in the tank 1, level provided by the sensor 20, then the control device 26 in the form of a device automatically detecting the actual level of filling of the tank 1 by the flow valve 24 by means of the electric motor 25 The passage valve 24 upstream of the stirring pipe 6 is adjusted or controlled as a function of the filling level of the tank 1 and so that when the reservoir 1 is filled, the pipe 6 receives more liquid than when the reservoir i empties so as to reduce the stirring power of the pipe 6 as the liquid reservoir 1 empties.

  The passage valve 24 is shaped like a van

  two-way drawer. In addition to driving

  6, the bypass line 30 connects to the passage valve 24, which

  leads into the return pipe 5 connected to the pump.

  pe. The bypass line 30 is connected to the con-

  suction line 8 through the return line 5.

  On the dosing valve 4 there is also the shut-off valve of the partial widths 24 upstream

  different spray lines; this robin

  net allows to cut the different lines of

  spraying 7 to reduce the spray width.

  tion. When cutting off different lines of

  spray-7, the vein of liquid supplied to the con-

  picks 7 is returned by line 23 to the

return pick 5.

  The agricultural sprayer according to FIG. 3 comprises a liquid reservoir 1, a pump 2, a pressure control valve 3, a metering valve 4, a return line 5, a stirring line

  31 as well as spray lines.

  suction pipe 8, provided with the filter 9, is connected to the bottom of the liquid tank 1, to lead to the pump 2. The pressure line 32 connects the pump 2 to the adjustable flow valve 33. The pump 2 is driven in a manner known per se, not shown in detail, from the PTO of a tractor. The pump 2 draws through the suction pipe 8 and the filter 9, the spray liquid contained in the tank 1 and delivers this liquid through the pressure line 32 to the flow valve 33 adjustable by the engine

  34. The pressure line 35 which is connected with

  corded to pressure control valve 3 is connected

  at the gate valve 33. In addition,

  The flow of liquid supplied to the stirring pipe 31 depends on the passage valve 33. Depending on the spray pressure set by the adjusting screw 11, the pressure which is read on the manometer 12, the desired flow rate, in known manner, is provided by the metering valve 4 provided for three partial widths, by the pipes 7 connected to the metering valve 4 up to the spray nozzles 13. The amount of

  liquid supplied by pump 2 in excess is return-

  the pressure lines 32 and 35 to the pressure control valve 3 and is again transferred to the return line 5 connected to the pressure control valve 3 to go to the tank containing the liquid. The return line 5 opens at point 14 in the suction line connecting the tank 1 to the pump 2. The point 14, to which the

  return line 5 opens into the vacuum line

  8, is located upstream of the filter 9 relative to the direction of suction and passage 15 so that the return line 5 opens into the suction pipe 8 upstream of the filter 9 in the direction of

aspiration and passage 15.

  The stirring pipe 31 is preceded

  as already indicated of the passage valve 33, regulating

  corn. This passage valve 33, upstream of the pipe

  The agitator 31 is adjustable (controllable) and can be continuously or multi-stage adjusted by the electric motor 34 for

  ability to reduce the driving power of the driving

  as the tank empties. To make

  to kill this setting of the passage valve 33, exactly by the electric motor 34, the latter is connected by the cable 37 to the control device 36. In addition, the control device 36 is connected by the cable 38 to the sensor 20 detecting the fill level. The corresponding filling level of the liquid tank 1 is transmitted by the sensor 20 and the cable 38 to the control device 36; the control device 36 and the electric motor

  then adjust the

  The passage valve 31, upstream of the stirring pipe 33, is then controlled or adjusted according to the filling level of the tank 1 and so that when the liquid reservoir 1 is filled, the stirring pipe 31 receives more liquid than when the reservoir 1 empties so as to reduce the stirring power of the pipe 31 as and when

as the tank 1 empties.

  The shut-off valve for partial widths

  the 22 is provided on the metering valve 4 upstream of the different spray lines so as to be able to cut these different lines 7 for

  reduce the spray width. By cutting off

  its spray lines 7, the vein of liquid supplied to the return line 5 is transferred to the return line 5.

conduits 7 through line 23.

  The agricultural sprayer according to Figure 4 consists of a liquid reservoir 1, a pump 2, a pressure control valve 39, a metering valve 40, a return line 5, d an agitating line 6 as well as spray pipes 41. The suction line is equipped with the filter 9 terminating in the pump 8 and connected to the bottom of the liquid tank 1. The pressure line 10 connects the pump

  2 to the pressure regulating valve 39 and the valve

  net dosing 40. The pump 2 is driven in a known manner, not shown in detail, by the power take-off of a tractor. The pump 2 draws the liquid to be sprayed through the suction pipe 8 and the filter 9 into the liquid tank i to discharge this liquid through the pressure line 10 which joins the pressure control valve 39. Depending on the pressure spray rate set by the adjusting screw 11 and the electric motor 42, which pressure is read on the pressure gauge 12, the desired amount of liquid is supplied, in a known manner, by the metering valve which is designed for five partial widths, by the line 41 connected to the valve 40 to the spray nozzles 13. The excess quantity of liquid supplied by the pump 2 is transferred via the pressure line 10 to the pressure control valve 39 via the return line 5 connected to the pressure regulating valve 39 to the feed tank. The return line 5 opens at point 43 in the suction line connecting the tank 1 to the pump 2. The point 43, where the

  return line 5 opens into the vacuum line

  8, is located upstream of the filter 9 in the direction of suction and passage 15 so that the return line 5 opens into the suction pipe 8 upstream of the filter 9 in the direction of suction and

of passage 15.

  The metering valve is connected to the agitation pipe 6. This pipe 6 comprises upstream an adjustable flow valve 24. This passage valve 24, upstream of the stirring line 6, is adjusted (controlled) or adjusted continuously or in several stages by the electric motor 25 to reduce the stirring power of the pipe 6 to measure that the tank empties. To make this adjustment of the passage valve 24 exactly and automatically by the electric motor, the tractor is equipped with the control and adjustment device 44 connected by the cable 45 to the sensor 20 which detects the noise.

  veal of the liquid in the reservoir 1. The state of replacement

  respective pleating of the level of the liquid 1 is indicated by the sensor 20 and the cable 45 to the control and adjustment device 44 and at this moment the level of

  liquid can be displayed by the display device

  ge 46. Depending on the level detected by the sensor 20 is correspondingly adjusted the flow valve 24 by the device 44, the cable 47 and the electric motor 25. The flow valve 24, upstream of the stirring pipe 6, can be adjusted or controlled according to the level of liquid in the tank 1

  so that when the tank is filled

  fold, the agitation pipe 6 receives more liquid than when the tank 1 is empty, so that the stirring power provided by the pipe 6 is

  reduce when the liquid tank 1 empties.

  In addition, the control and adjustment device 44 is connected by the cable 48 to the speed sensor 49. The speed sensor 49 is provided on a wheel on the ground, for example on the front wheel of the tractor carrying the sprayer. To guarantee the distribution of a constant quantity of spray agent for variable speeds,

  the pressure valve 39 is regulated by the electric motor

  42 depending on the variable speeds being connected by the cable 50 to the device 44. To avoid

  that the flow rate does not change when the power of agitation

  This change occurs, that is to say when the flow valve 24 upstream of the stirring pipe 6

  This setting of valve 24 is

  at the same time adjusted to a setting of the pressure valve 39 of the metering valve 40 to maintain constant the amount of liquid to be dispensed. This adjustment control is ensured by the control and adjustment device 44.

  Upstream of the different spray pipes

  compared to the metering valve 4, there is the cut-off valve of partial width 51 which cuts

  the different spray lines 41 to re-

  to obtain the spray width. By cutting the different spray pipes 41, we control the

  vein of liquid supplied to the lines 41 by the con-

  The shut-off valve 51 has remote controlled valves 52 which are actuated via the control device 44 and the cables 53. In addition, the cable 54 is connected to the flowmeter 55 to determine the speed. number of

  liquid actually dispensed by the device 44.

  The agricultural sprayer according to Figure 5 consists of a liquid tank 1, a pump 2, a pressure control valve 39, a metering valve 40, a return line 5,. an agitating line 56 as well as spray lines 41. The suction line 8, equipped with the filter 9, is connected to the bottom of the tank 1 containing the liquid; this line leads to the pump 2. The pressure line 10 from the pump 2 is connected to the pressure control valve 39 and the

  metering valve 40. Pump 2 is driven by

  known and not shown from the PTO of a tractor. Pump 2 sucks by the

  suction line 8 equipped with the filter 9, the liquid

  in the tank 1 and delivers this liquid through the pipe 10 to the pressure adjustment valve 39. According to the spray pressure

  regulated by the adjusting screw 11 and the electric motor

  42, pressure which is read on the manometer 12, the desired amount of liquid is provided, in known manner, through the filter 57 which rinses by a reverse circulation and the metering valve 40 provided for five partial widths; this quantity of liquid is supplied to the spray nozzles 13

  by the lines 41 connected to the metering valve 40.

  The amount of surplus liquid supplied by the pump

  2, the pressure line 10 connected to the pressure control valve 39 is transferred via the return line 5 connected to the pressure control valve

  39 to the tank. The return pipe 5 opens

  check point 43 in the suction line connecting tank i to pump 2. Item 43 is located in

  upstream of the filter 9 with respect to the suction direction

and passage 15.

  In addition, the agitation line 56 is connected to the outlet 58 of the filter 57 which is cleaned by a reverse circulation of liquid. Between the filter 57 and the agitation line 56 is the adjustable flow valve 58. This valve 59 upstream of the pipe 56 is controlled or adjusted continuously or step by step by the electric motor 25 to adjust the stirring power of the pipe 56 as the tank empties. For this setting

  valve 59 is performed accurately and automatically

  the engine 25, the tractor is equipped with the

  control and adjustment device 60 connected by the cable 45 to the sensor 20 detecting the level of the liquid in the reservoir 1. The respective level in the reservoir

  1 is indicated by the sensor 20 and the cable 45 to the disc

  positive 60 which allows to display the level of

  liquid by the display device 46.

  the caliber detected by the sensor 20, the valve of

  passage 59 through the device 60, the cable 47 and the

  25. The passage valve 59 upstream of

  the agitating line 6 can be adjusted or controlled

  if according to the filling level of the tank 1 and so that when the tank 1 is filled, the agitating pipe 6 transfers more liquid than when the tank i empties; this reduces the stirring power of the pipe 6 as and when

as the reservoir i empties.

  The control and adjustment device 60

  is connected by the cable 48 to the speed detector 49.

  This detector 49 co-operates with a wheel on the ground, for example one of the front wheels of the tractor carrying the sprayer. To guarantee a constant flow of sprayed products when the speed changes, the pressure valve 39 is connected by the engine

  42 which is connected by the cable 50 to the arrangement

  60 to be adjusted according to the speed

  In order to prevent the quantity dispensed from changing when the stirring power changes, that is to say when adjusting the flow valve 59 upstream of the stirring line 6, the setting of valve 59 to that of the pressure control valve 39 of the metering valve 40 to maintain

  constant the flow provided. This enslavement is

* by the control and adjustment device 60.

  The shut-off valve for partial widths

  the 51 is provided on the metering valve 4 upstream of the different spray lines; this valve 51 can cut the different pipes

  41 to reduce the spray width.

  tion. During the cutting of different pipes 41, the stream of fluid supplied to the pipes 41 is diverted by the pipe 23 into the return pipe 5. The valve 51 comprises various remote controlled valves 52 which are actuated by the control device via cables 53. In addition, the cable 54 connects the flow meter 55 to the device 60, which

  flowmeter determining the actual amount of liquid

  provided. The agricultural sprayer of FIG. 6 comprises a tank 1, a pump 2, a pressure control valve 39, a metering valve 40, a return line 5, a stirring line 6 and the spray lines 41. The suction pipe 8 provided with the filter 9 is connected to the bottom of the

  tank 1, this pipe leading to the pump 2.

  The pressure line 61 connects the pump 2 to the valve

  pressure adjusting device 39 and the dosing valve 40.

  The pump 2 is driven in a known manner and not

  represented from the power take-off of a trac-

  tor. The pump 2 draws the liquid to be sprayed via the suction pipe 8 equipped with the filter 9 into the tank 1 to discharge this

  liquid by the pressure line 61 to the van-

  Pressure adjusting device 39. Depending on the spray pressure set by the adjusting screw 11 and the electric motor 42, which pressure is displayed by the pressure gauge 12, the desired quantity of liquid is supplied by the metering valve 40 provided for five partial widths and through the lines 41 connected to the valve 40 to the spray nozzles 13. The amount of excess liquid supplied by the pump 2

  and the pressure line 10 to the control valve

  pressure setting 39 is returned by the return line 5 connected to the pressure control valve 39

  into the tank. The return pipe 5 de-

  mouth at point 43 in the suction line

  linking the tank 1 to the pump 2. The point 43, where the return pipe 5 opens into the suction pipe 8, is upstream of the filter 9 according to the

  sense of aspiration and passage 5 so that

  pick 5 opens into line 8 upstream of the filter

9 always in the direction 15.

  The return pipe 6 is connected to the

  net of dosage 40. The agitation line 6 is previously

  This passage valve 24, upstream of the pipe 6, is adjustable and can be adjusted continuously or in several stages by the electric motor 25 to reduce the stirring power of the pipe 6 as and as the tank empties. In order to effect exactly and automatically this adjustment of the valve 24 by the electric motor, the control and adjustment device 62 is provided on the tractor, which device is connected by the cable 63 to the flowmeter 64 which is mounted in the pipe 65 connected to the spray lines 41 for the dosing valve and detects the quantity of

  actually dispensed liquid: The electronic device

  62 receives the actual flow provided by the

  flow meter 64. Starting from the quantity of liquid initially contained in the reservoir and that dispensed (measured by the flowmeter 64), the electronic calculator constituting the device 62

  instantly calculate the amount of liquid that

  in the tank and the level of filling

  ge. According to the calculated level, the device 62, the cable 47 and the electric motor 25, regulate the flow valve 24. The flow valve 24, upstream of the stirring pipe 6, is thus adjusted or controlled according to the level of flow. liquid in the tank 1 and that so that when the tank 1 is filled, the pipe 6 receives more liquid than when the tank 1 empties; the stirring power provided by line 6 is thus adjusted to the level of

filling the tank 1.

  The control and adjustment device 62

  is connected by the cable 48 to the speed detector 49.

  This detector 49 cooperates with a wheel on the ground such as for example one of the front wheels of the tractor carrying the sprayer. In order to have a constant supply rate of spraying agent when the speed changes, the pressure valve 39 is adjusted by the electric motor 42 connected by the cable 50 to the

  device 62 as a function of the speed variation.

  To prevent the quantity distributed from changing

  that the stirring power changes, that is to say

  when the passage valve 24, upstream of the pipe

  6 is set, the setting of the flow valve 24 is controlled by adjusting the flow control valve 39 of the metering valve 40 to keep the amount of liquid dispensed constant. This

  enslavement is ensured by the control device

of and adjustment 62;

  Upstream of the different spray pipes

  at the metering valve 4 is the partial width cut-off valve 51 which

  allows to cut the different spray lines

  41 to reduce the spray width. By cutting the different spray lines 41, the vein of liquid supplied to the lines 41 is deflected by the line 23 back to the line 5. The valve 51 consists of remote controlled valves 52 that are actuated using the device order 62

via the cable 53.

Claims (4)

1) Agricultural sprayer comprising a liquid reservoir, a pump, a metering valve, a return line and a stirring line opening into the reservoir, the stirring line comprising upstream , an adjustable passage valve, sprayer characterized in that the passage valve (16, 24, 33, 59) upstream of the stirring line (6, 31, 56) can be adjusted or controlled according to the filling level of the reservoir (1) so that when the reservoir (1), the stirring pipe (6, 31, 56) receives more fluid than when the reservoir (1) empties so that the power of agitation provided by the pipe (6, 31, 56) is reduced when the reservoir (1) empties.   2-) Agricultural sprayer according to the   cation 1, characterized in that the passage valve (16), upstream of the stirring line (6), is controlled or manually adjusted, continuously, or following several levels.   3-) Agricultural sprayer according to the   cation 1, characterized in that the passage valve (24, 33, 59), upstream of the stirring line (6, 31, 56), is controlled or regulated by a device   (20, 26, 36, 60, 62) automatic, detecting or calculating   the actual filling level of the tank.   4 ') Agricultural sprayer according to the   cation 1 and / or claim 3, characterized in that a sensor (20) is associated with the reservoir (1) to detect the filling level, which sensor controls or adjusts the flow valve (16, 24, 33, 59). An agricultural sprayer according to claim 1 and / or claim 3, characterized by an electronic metering device (62) provided on the sprayer having a flow meter (64) and an electronic calculator (62) measuring the actual dispensed amount, and starting from the quantity initially contained in the reservoir (1) and the quantity of liquid dispensed, the computer (62) determines the quantity that remains in the reservoir (1), and depending on this quantity remaining in the reservoir (1). ), it adjusts the passage valve (24) to reduce the stirring power exerted by the driving (6).   6-) Sprayer according to at least one of   claims i to 5, characterized in that   the flow valve (24) upstream of the stirring line (6) is at the same time controlled by the metering valve (37, 40) to keep the quantity constant. of liquid to be dispensed.   7 ') Agricultural sprayer according to the   cation 1, comprising a pressure line from the pump and connected by the metering valve to the distribution nozzles, characterized by a nozzle for the stirring line (6) in the pressure line (10), the passage valve (24) being in the form of a two-way slide valve and in that parallel to the agitation pipe (6), the flow valve (24) is connected to a bypass pipe   (30) which opens into the tank or into the pipeline   suction end to the tank.   8 ') agricultural sprayer comprising a liquid reservoir, a pump, a metering valve, a return line and a stirring line opening into the liquid reservoir, in particular according to claim 1, a return line;   deriving from the dosing valve and the quantity exceeding   liquid transferred by the pump being returned to the liquid tank, sprayer   characterized in that the return duct (5)   only in the suction line (8)   connecting the tank (1) to the pump (2).   9 ') Agricultural sprayer according to the   cation 8 with a filter provided in the suction line, sprayer characterized in that the   return line (5) leads into the driving of   (8) upstream of the filter (9) relative to the   suction and passage direction (15).   10 *) Agricultural sprayer according to at least   any one of claims 1 to 9, a driving   pressure valve connecting the pump to the metering valve, a sprayer characterized by a passage valve (33) provided in the pressure line (32) and the   agitating pipe (31) is derived from the ge (33).   11-) Agricultural sprayer according to at least   any one of claims 1 to 9, characterized   in that the metering valve (40) comprises a rinsable filter (57) having an adjustable valve (59) provided between the valve (39) which regulates the quantity to be dispensed on the metering valve and the outlet (41), the agitation duct (56) being connected to the valve (59) associated with the outlet (58)   of this filter (57), and depending on the level of   pleating of the tank (1), we adjust or order this valve (59).