CN101378654A

CN101378654A - Spray bar for spraying products and product -spraying agricultural appliance

Info

Publication number: CN101378654A
Application number: CNA200780004830XA
Authority: CN
Inventors: P·R·蒙塔涅尔; S·贝洛·德卡瓦尔奥
Original assignee: Kuhn SAS
Current assignee: Kuhn SAS
Priority date: 2006-02-08
Filing date: 2007-02-06
Publication date: 2009-03-04
Anticipated expiration: 2027-02-06
Also published as: WO2007090989A3; WO2007090989A2; FR2896949A1; BRPI0707595B1; BRPI0707595A2; FR2896949B1; EP1983824A2; CN101378654B

Abstract

The invention relates to a spray bar (1) for a product-spraying agricultural appliance (2) equipped with a suspension device (3) by which means the bar (1) is connected to the chassis (4) of the agricultural appliance (2), said suspension device (3) comprising: a connecting rod (6) which links the bar (1) to the chassis (4), said rod (6) being connected to the chassis (4) by means of a first articulated element (7) of an axle oriented in the direction of advancement, and to the bar (1) by means of a second articulated element (8) of an axle which is also oriented in the direction of advancement; springs (16A, 16B) which are used to act against the pivoting of the bar (1) about the second articulated element (8); and dampeners (18A, 18B) for damping the pivoting of the bar (1) about the second articulated element (8). Said bar (1) is characterised in that the suspension device (3) also comprises additional springs (21A, 21B) acting between the bar (1) and the chassis (4), and the centre of gravity (28) of the bar (1) is located essentially in the vicinity of the second articulated element (8), preferably slightly beneath the second articulated element (8).

Description

Be used for the spray boom that product and product spray farm machinery

Technical field

[01] the present invention relates to total technical field that product sprays, and be particularly related to the field of the treatment product spraying operation of plant quarantine type.

[02] the present invention relates to a kind of product sprinkling spray boom (boom) (hereinafter being called spray boom) that product sprays farm machinery (hereinafter being called farm machinery) that is used for, described sprinkling spray boom is furnished with a suspension arrangement, spray boom is connected on the mounting of farm machinery by this suspension arrangement, described suspension arrangement comprises described spray boom is connected to connecting rod on the described mounting, this connecting rod is connected on the described mounting by first articulated elements, and be connected on the spray boom by second articulated elements, the direction of the orientation of its axis forward travel of described first articulated elements between operational period, the axis of second articulated elements points to the direction of forward travel equally between operational period, described suspension arrangement comprises and is used to resist the spring that spray boom acts on around the pivot of second articulated elements and is used to slow down the damper of spray boom around the pivot of described second articulated elements.

Background technology

[03] the aforesaid suspension arrangement that sprays on the spray boom that is installed to is disclosed in document FR 2 813 212.In fact the document of prior art has described a suspension arrangement, and it comprises that the product that spray boom is connected to agricultural spray device type sprays the connecting rod on the mounting of farm machinery.This connecting rod is connected on the mounting by first articulated elements, the axis of described first articulated elements points to the direction of forward travel between operational period, and this connecting rod is connected on the spray boom by second articulated elements, and its axis of described second articulated elements is the same direction of pointing to forward travel between operational period.This known suspension arrangement also comprises to be resisted the spring that spray boom acts on around the pivot of second articulated elements and is slowing down the damper of spray boom around this motion of this second articulated elements.Described spring and damper extend between a spray boom and a cross bar, and this cross bar is being fixed on the connecting rod by first hydraulic cylinder between operational period.Second hydraulic cylinder also is set between mounting and connecting rod, and it can prevent that between operational period connecting rod from centering on the pivot of first articulated elements or preventing this pivoting action.

[04] utilize aforesaid suspension arrangement, the state of spray boom can not reach best on the ground of uneven or inclination.This is because in the structure with one degree of freedom (preventing to center on the pivot of first articulated elements by second hydraulic cylinder), when on very many pits and rugged ground, advancing, if when agriculture sprinkler or the gradient that the ground below the wheel of vehicle of sprinkler is installed do not meet ground line gradient, then operating personnel have to use personally first hydraulic cylinder to proofread and correct the orientation of spray boom, and first hydraulic cylinder is called as " crossfall hydraulic cylinder " for this reason.In structure with two kinds of degree of freedom (can center on first hinge), when operating agriculture sprinkler or the vehicle of this sprinkler is installed by a cross fall (cross-fall slope), spray boom can not be parallel to ground line gradient and locate itself under the effect of gravity.

Summary of the invention

[05] the objective of the invention is to improve this known suspension arrangement, and propose a kind ofly can improve spray boom performance and particularly can be suitably directed its suspension arrangement, and no matter farm machinery or be equipped with these farm machinery vehicle to run state of ground how.

[06] for this reason, a key character of the present invention is that described suspension arrangement is included in the additional springs that acts between the mounting of spray boom and farm machinery in addition, and the center of gravity of spray boom is located substantially near second articulated elements and preferably a shade below second articulated elements.

[07] described additional springs guarantees automatically to redirect described spray boom, and this and farm machinery or that the state of ground of vehicle to run of these farm machinery is installed is irrelevant are not considered service condition yet.Also promptly buffering is fallen by the pit on ground and the caused vibration of jolting.

Description of drawings

[08] accessory rights require and the explanation with reference to the nonrestrictive exemplary embodiment of accompanying drawing in, other features and advantages of the present invention more clearly embody, wherein:

[09] Fig. 1 has described total figure of the farm machinery that are equipped with spray boom, and this spray boom is furnished with by suspension arrangement of the present invention,

[10] Fig. 2 shown when farm machinery on smooth ground the up rearview of described suspension arrangement and spray boom when advancing,

[11] Fig. 3 has shown the rearview of described suspension arrangement and spray boom when advancing on farm machinery have the ground of cross fall.

Embodiment

[12] Fig. 1 illustrates an exemplary embodiment that is used for farm machinery 2 and is furnished with the spray boom 1 of suspension arrangement 3 according to of the present invention.The purpose of suspension arrangement 3 is that spray boom 1 is hanging on the mounting 4 as the farm machinery 2 of sprinkler, thereby allows directed rightly described spray boom 1 to be fit to the landform that farm machinery 2 are advanced especially.This spray boom 1 is especially for the treatment product of the fertilizer that will need to spray, plant prevention of epidemis type or need the product of other kinds to be sprayed onto as far as possible equably on ground S or the crops.For this reason, between operational period, farm machinery 2 move by the direction of the forward travel of arrow A indication.Only partly demonstrate spray boom 1 in the drawings.

[13] in the remainder of specification, the meaning of " front " and " back ", " in front " and " in the back " is that the direction A of relative forward travel stipulates, and the meaning on " the right " and " left side " is to define when observing farm machinery 2 from behind on the direction A in described forward travel.

[14] when farm machinery 2 were mobile in afield, spray boom 1 bore motion and stress.The special role of suspension arrangement 3 is the motions that absorb and weaken tractor, and preventing that they directly and fully are delivered on the spray boom 1, thereby this spray boom comes operation by best mode in can be afield.

[15] particularly as can seeing in Fig. 2, suspension arrangement 3 comprises spray boom 1 is connected on the connecting rod 6 of mounting 4 of farm machinery 2.Connecting rod 6 is connected on the mounting 4 by first articulated elements 7, and is the axis of this first articulated elements is roughly level between operational period and roughly point to the forward motion direction A.As for spray boom 1, it is coupled on the connecting rod 6 by second articulated elements 8, and the axis of this second articulated elements also is roughly level between operational period and direction A that also roughly point to forward travel.Therefore, are " swing " types by suspension arrangement 3 of the present invention.

[16] in a known mode, described spray boom 1 has central section 9, and also have

arm

1A, 1B in each side of central section, each is made of described arm one or

more centre portion

10A, 10B and an outmost section (not shown), in known way, described

section

10A, 10B interconnect by articulated elements respectively.Some

centre portion

10A, 10B only are shown in Fig. 1 and 2.Not shown in the drawings outmost section.For example in the situation of agriculture sprinkler, each

section

9,10A, 10B are used to carry the sprinkler part as spray nozzle, so that product is sprayed on ground S or the crops.Roughly locate symmetrically on the vertical centering control plane 11 of the relative spray boom 1 with outmost section of centre portion 10A, 10B.Therefore, the center of gravity 28 of spray boom 1 roughly is arranged in described vertical centering control plane 11.

[17] during the spraying operation of product, arm 1A, the 1B of spray boom 1 extends to the very wide plot of covering: therefore, between operational period, spray boom 1 is transverse to the direction A of forward travel and be roughly parallel to ground S and extend.

[18], fold described

arm

1A, 1B in the known manner so that reduce the volume of spray boom 1, and particularly meet the size of on public highway, travelling and being allowed in order to transport.The outmost section of each

arm

1A, 1B of spray boom 1 and

centre portion

10A, 10B are respectively by

corresponding actuator

13A, 13B and corresponding elastic system 14A, a 14B, around their interconnective articulated elements being come generally perpendicularly folding or roughly being deployed into horizontal level.For example,

actuator

13A, 13B are hydraulic cylinder.Each

actuator

13A, 13B extend between centre portion 10A, the 10B of central section 9 and corresponding adjacency.As for corresponding outmost section and additional in case of

necessity centre portion

10A, 10B, they fold and open by means of corresponding

elastic system

14A, 14B respectively.Each

elastic system

14A, 14B comprise a traction element 15A, the 15B that is connected on extension spring 16A, the 16B for this

reason.Spring

16A, 16B are connected on the connecting rod 6 at

corresponding tie point

17A, 17B place on one end thereof.Described

spring

16A, 16B are connected on respective arms 1A, the 1B of spray boom 1 on its another

end.Spring

16A, 16B are connected on corresponding traction element 15A, the 15B, and traction element itself acts on corresponding

additional centre portion

10A, 10B and the corresponding outmost section.The main effect of

spring

16A, 16B is to open and fold corresponding

additional centre portion

10A, 10B and corresponding outermost section.Preferred

traction element

15A, 15B are cable.

[19] exist to use cumulative big operation width and with the trend of the farm machinery 2 of the speed running that improves day by day.Described farm machinery move fast more, and the risk that some member of then described farm machinery 2 will deform under the heavily stressed effect that may therefore produce or break is just big more.The increase of the size of the raising of operating speed and spray boom 1 needs firm structure and suitable suspension arrangement 3.Therefore, the suspension arrangement 3 of spray boom 1 that is used for farm machinery 2 is in the good distribution of the product of guaranteeing to be sprayed and prevent that any damage that causes the loss of time and maintenance cost to increase from being crucial component parts.

[20] in order to keep spray boom 1 roughly parallel to the ground, suspension arrangement 3 uses

elastic system

14A, 14B, and particularly its

spring

16A, 16B, second effect of described spring is to resist spray boom 1 around the pivot of second articulated elements 8 and act on, and absorbs and disengage to make spray boom 1 produce the energy of oscillating movement.

[21] suspension arrangement 3 also is included in damper 18A, the 18B that extends between central section 9 and the connecting rod 6, and damper can be prevented the motion of spray boom 1 around second articulated elements 8.Damper 18A, 18B shortened vibration the duration, suppressed the amplitude of described vibration, they have disperseed energy.Damper 18A, 18B eliminate the oscillating movement that is imported by spring 16A, 16b.

[22] as previously mentioned, each

spring

16A, 16B attach on the connecting rod 6 by tie point 17A,

17B.Tie point

17A, 17B are preferably placed near second articulated elements 8 and roughly near the vertical midplane of connecting rod 6, yet do not overlap with described second articulated elements 8, thereby

spring

16A, 16B act on described second articulated elements 8 with certain lever arm.Advantageously,

spring

16A, 16B approximate horizontal ground and roughly extending perpendicularly with the direction A of forward travel.Advantageously,

spring

16A, 16B locate near the mode that second articulated elements 8 passes through by their corresponding positions.Described

spring

16A, 16B act on size about equally and the opposite power of direction on connecting rod 6.The position of

spring

16A, 16B is symmetrical about the vertical midplane 11 of spray boom 1.Their allow spray boom 1 relative second articulated elements 8 automatically to center again, act on around the pivot of described second articulated elements 8 because they are resisting spray boom 1.Described

spring

16A, 16B are relative stiffnesses, because they also must draw corresponding additional mid portion 10 and corresponding outermost part so that strengthen them between operational period.Therefore, advantageously, spray boom 1 reduces relatively around the degree of freedom of the pivoting action of second articulated elements 8, and

spring

16A, 16B allow motion by a small margin.

[23] as previously mentioned,

damper

18A, 18B be positioned at spray boom 1, more especially between its central section 9 and the connecting rod 6.For this reason, connecting rod 6 each side on plane therein comprises a

wing member

19A, 19B, and

corresponding damper

18A, 18B are attached to the end of described wing member.When farm machinery 2 were positioned on the ground of level, the described midplane of connecting rod 6 roughly overlapped with the midplane 11 of spray boom 1.Two

wing member

19A, 19B are symmetrical.Therefore, the midplane 11 of the relative spray boom 1 of

damper

18A, 18B is roughly installed symmetrically.In addition, these dampers are positioned at second articulated elements, 8 tops by upwards converging to, preferred even mode that be positioned at 1 P1 of a distance, first articulated elements, 7 top is installed.

Wing member

19A, 19B are inclined upwardly a little, so that their convergent point roughly is positioned at the described midplane of connecting rod 6.When described connecting rod 6 pivoted around first articulated elements 7, each wing member 19a, 19b were used for sliding on a part of 4A, the 4B of mounting 4 with a certain amount of frictional force.

[24] as for around the pivoting action of first articulated elements 7, they are connected the friction that bar 6 leans against on the mounting 4 and slow down.For this reason, the end that contacts with mounting 4 of each

wing member

19A, 19B is furnished with

friction shoe

20A, 20B, and described

wing member

19A, 19B are by counterpart 4A, the 4B of described friction shoe friction mount 4.Therefore, prevented device 19A-4A, 19B-4B to prevent around the pivot of first articulated elements 7.This prevents device 19A-4A, 19B-4B to act between connecting rod 6 and the mounting 4.

[25] according to a key character of the present invention, suspension arrangement 3 also comprises additional springs 21A, the 21B that acts between spray boom 1 and the mounting 4.

Additional springs

21A, 21B roughly extend symmetrically in each side of the midplane 11 of described spray boom 1.As can be observed in the drawings,

additional springs

21A, 21B extend in each side of described midplane 11.Described

additional springs

21A, 21B have two.

Spring

16A, 16B also roughly extend symmetrically in each side of vertical midplane 11.Each

spring

16A, 16B are connected to one of

respective arms

1A, 1B of spray boom 1.The center of gravity 28 of spray boom 1 roughly is positioned on the vertical midplane 11.In addition, this center of gravity roughly is positioned near second articulated elements 8 and preferably a shade below second articulated elements.

[26] owing to have described

additional springs

21A, 21B, thereby improved the swing characteristic of spray boom 1, therefore, this spray boom can be located itself in the sloping floor quickly, and from the oscillating movement of tractor, keep apart better, and the conditional independence of the situation of the ground S that this and farm machinery 2 are advanced and its use.Then, this makes spray boom 1 roughly always remain parallel to ground S, and irrelevant with the speed of landform situation and forward travel.Therefore, during spraying operation, operating personnel can pass through along the ground of the inclination of all directions, and do not need to adjust the posture of spray boom 1, even this plot is very dark pit.

[27] advantageously,

additional springs

21A, 21B locate lowlyer than first articulated elements 7, and the roughly extension symmetrically of relative first articulated elements 7, thereby utilize relative this first articulated elements 7 of certain lever arm to act on.Between operational period, when observing on the direction A in forward travel, it is vertical that

additional springs

21A, 21B are roughly.In described example, they are positioned between corresponding extension 22A, the 22B of spray boom 1 and mounting 4.In fact, advantageously, described

additional springs

21A, 21B are positioned at ground surface S and install in the mode on 1 P2 of the big distance of next section by converging to.Advantageously, described

additional springs

21A, 21B are extension spring.They also have big flexibility, and in other words, their feature is open and flat relatively.Their linear deformation is remarkable, because their rigidity is lower.

[28] also can consider: the user can change

additional springs

21A, 21B and act on power on the spray boom 1.Propose:, implement being connected between corresponding extension 22A, the 22B of each

additional springs

21A, 21B and mounting 4 by using the 25A of screw/nut system, the 25B that allows to adjust described active force for this reason.If necessary, this adjustment can change the performance of spray boom 1, but when described spray boom 1 is replaced by the spray boom of (for example when the substituting 12 meters spray boom with 15 meters spray boom) of different length, also must carry out this adjustment.Can adjust by

additional springs

21A, 21B and be applied to active force on the spray boom 1.

[29] advantageously, can also adjust the active force that applies by spring 16A, 16B.The attachment point 17A, the 17B that link on the connecting rod 6 by conversion each

spring

16A, 16B implement this adjustment.For this purpose, connecting rod has a plurality of possible tie points.A kind of possible alternative be

tie point

17A, 17B can be arranged on can on the described connecting rod 6 by the member of translational motion on.Therefore, the distance between tie point 17A, the 17B of each

spring

16A, 16B and second articulated elements 8 is adjustable.Described adjustment can make suspension arrangement 3 be adapted to ground; If ground is very rugged and rough and pit,

tie point

17A, 17B then just will be near second articulated elements 8 so.Advantageously, it is also conceivable that the position of the tie point of adjusting

damper

18A, 18B, so that described damper adapts to condition of work.Therefore, the wing member 19A of connecting

rod

6,19B also have a plurality of possible tie point that is used for described damper 18A, 18B.Therefore, can change the susceptibility of suspension arrangement 3 and the dynamic response of spray boom 1.

[30] in described exemplary embodiment, described farm machinery 2 are the mounted sprayer type of tractor.Therefore, the gross weight of described farm machinery 2 is carried by tractor.The mounting 4 of farm machinery 2 is made by being connected to 3 modes that articulate that belong to tractor.Farm machinery 2 also comprise the storage tank 23 that is used to hold treat liquid.Can see that according to Fig. 1 described storage tank 23 is by mounting 4 supportings.In known method, farm machinery 2 comprise that also pumping is contained in treat liquid in the described storage tank 23 it is assigned to the pumping parts (not shown) in the described spray nozzle under pressure.Therefore, described treat liquid is deposited as tiny droplet on the plant that will handle or ground S.Because this class nozzle is widely known by the people, therefore they is not shown in the drawings and can not described in addition yet it.

[31] also in known mode, mounting 4 can be made in the mode that moves on the short transverse of ground S by spray boom 1.In the exemplary embodiment, mounting 4 is formed into two

parts

26,27 in the known manner: carriage 26 and framework 27, spray boom 1 is connected on the described carriage 26 by suspension arrangement 3, and described framework is used to be connected to tractor.Carriage 26 can carry out translational motion under the effect of actuation component on framework 27, described actuation component also is known and it is not described: manpower winch, hydraulic cylinder etc.Therefore, can select spray height, especially, make its be fit to size of the plant of need processing to be fit to working condition.

[32] as shown in Figure 2, if farm machinery 2 are advanced on the little ground of smooth fluctuating, then mounting 4 is influenced by great oscillating movement can, and spray boom 1 is relatively stable and keep and be roughly parallel to ground S.

Elastic system

14A, 14B apply equal and opposite in direction and direction opposite effect power on connecting rod 6, therefore described connecting rod be roughly vertical.As for

additional springs

21A, 21B, they apply equal and opposite in direction and direction opposite effect power equally on spray boom 1.Therefore, spray boom 1 is kept overhead one section constant distance of S, thereby and from one section constant distance of pending plant.

[33] yet, usually during spraying operation, farm machinery 2 are subjected to many motions and vibration, described motion and vibration may with different, can disturb the forms of motion of the correct distribution of the product that is sprayed be passed on the spray boom 1: may change moving both vertically and from front to back horizontal movement of the height that is fixed to the flusher on the described spray boom 1.Moving both vertically bothers most, because they have changed the area that is sprayed at the product on the S of ground, and causes product to use deficiency sometimes and to make that sometimes product sprays excessive.

[34] suspension arrangement 3 of the present invention must filter or at least reasonably well weaken these harmful motions that are delivered on the bar 1.Farm machinery 2 afield on the walking with spray products during, its spray boom 1 almost always stands the comprehensive function in above-described two motions.When advancing with high speed, these motions are also increased the weight of.For this reason, suspension arrangement 3 also comprises the additional damper 24 that is installed between mounting 4 and the spray boom 1 except comprising two damper 18A, 18B.Should can weaken the motion that spray boom 1 roughly centers on first articulated elements 7 by additional damper 24.

[35] must be on uneven and/or rugged ground during operation when farm machinery 2, be the uneven portion (bump, hole, pit etc.) that the wheel 5 of tractor suffers from ground.(taking turns 5 when falling into depression or upwards crossing bump) described unexpected vertical mobile unexpected lateral movement that causes mounting 4 of one taking turns in 5 when described.Should vertically move the unexpected lateral movement that also causes first articulated elements 6.Yet, since to

different spring

16A, 16B, 21A, 21B with suspend to

different damper

18A, 18B, 19A-4A, 19B-4B, 24 swing, thereby the spray boom 1 that temporarily departs from its level position is understood than turning back to more quickly on its position parallel with ground S.

[36] Fig. 3 has described when farm machinery 2 spray boom 1 and suspension arrangement 3 during operation on the ground that tilts.Here, under the combined influence that

different spring

16A, 16B, 21A, 21B and

different damper

18A, 18B, 19A-4A, 19B-4B, 24 swing suspend, spray boom 1 automatically takies the position of surperficial almost parallel with ground S, if and this ground with cross fall has uneven portion (bump, depression, pit etc.) in addition, its property class is similar to aforesaid.

[37] suspension arrangement of just having described of the present invention 3 is suitable for operation on the level land, also be suitable for having operation on the ground of cross fall, and no matter how all like this configuration on the surface of ground S is.Especially, it is roughly parallel with ground S that spray boom 1 keeps, and the high vibration that mounting 3 may suffer between operational period is filtered and weakens well, and this has nothing to do with service condition.

[38] the invention still further relates to a kind of trailedly or advance the product of type to spray farm machinery automatically, it comprises by product of the present invention and sprays spray boom 1.When farm machinery 2 were installed on the tractor or advance type automatically, described tractor or described drill autofeeder were represented with 4.The rolling mounting that is pulled car traction and utilizes itself when farm machinery 2 is when ground S advances, and by 4 expressions are described rolling mountings.

[39] the present invention especially is applied on the agriculture sprinkler, and can also be used for fertilizer placement apparatus etc.

Be clear that quite that [40] the present invention is not limited to the embodiment shown in above-described and the accompanying drawing.Still can improve, particularly, perhaps be replaced, and can not break away from field by the defined protective device of accompanying Claim by equivalent technologies about the composition or the quantity of different elements.

Claims

1. one kind is used for the product sprinkling spray boom (1) that product sprays farm machinery (2), described sprinkling spray boom (1) is equipped with suspension arrangement (3), described spray boom is connected on the mounting (4) of described farm machinery (2) by this suspension arrangement, and described suspension arrangement (3) comprising:

Connecting rod (6), it is connected to described spray boom (1) on the described mounting (4), described connecting rod (6) is connected to described mounting (4) by first articulated elements (7) and goes up and be connected on the described spray boom (1) by second articulated elements (8), the axis of wherein said first articulated elements points to the direction (A) of forward travel between operational period, the axis of described second articulated elements also points to the direction (A) of described forward travel between operational period

Spring (16a, 16b), its be used to resist described spray boom (1) around the pivot of described second articulated elements (8) and act on and

Damper (18A, 18B), it is used to slow down the described pivot of described spray boom (1) around described second articulated elements (8),

It is characterized in that described suspension arrangement (3) also is included in the additional springs (21A, 21B) of effect between described spray boom (1) and the described mounting (4); And the center of gravity (28) of described spray boom (1) roughly is positioned near described second articulated elements (8) and preferably a shade below described second articulated elements (8).

2. spray boom as claimed in claim 1 is characterized in that, described additional springs (21A, 21B) described relatively first articulated elements (7) is roughly located symmetrically, and acts on described relatively first articulated elements of certain lever arm (7).

3. spray boom as claimed in claim 1 or 2 is characterized in that, the direction (A) in described forward travel between operational period goes up observation, and described additional springs (21A, 21B) is roughly vertical.

4. spray boom as claimed in claim 3 is characterized in that, described additional springs (21A, 21B) is mounted to and converges to a bit (P2) that is positioned at one section big distance under the ground (S).

5. spray boom according to any one of claims 1 to 4 is characterized in that, described additional springs (21A, 21B) has more flat characteristic (distortion on the significant length direction).

6. as each described spray boom in the claim 1 to 5, it is characterized in that the active force that is applied by described additional springs (21A, 21B) can be adjusted.

7. as each described spray boom in the claim 1 to 6, it is characterized in that having two described additional springs (21A, 21B).

8. as each described spray boom in the claim 1 to 7, it is characterized in that described spray boom (1) is prevented device (19A-4A, 19B-4B) to be prevented around the pivot of described first articulated elements (7).

9. spray boom as claimed in claim 8 is characterized in that, the described device (19A-4A, 19B-4B) of preventing acts between described connecting rod (6) and the described mounting (4).

10. spray boom as claimed in claim 9, it is characterized in that, described connecting rod (6) has two preferred roughly wing members (19A, 19B) of symmetry, when described connecting rod (6) when described first articulated elements (7) pivots, each wing member is used for going up slip with the part (4A, 4B) of a certain amount of friction in described mounting (4), and the described counterpart (4A, 4B) of these symmetrical wing members (19A, 19B) and described mounting (4) forms the described device (19A-4A, 19B-4B) of preventing.

11. spray boom as claimed in claim 10, it is characterized in that, during the pivot of described first articulated elements (7), each wing member of described connecting rod (6) (19A, 19B) goes up at the counterpart (4A, 4B) of described mounting (4) by corresponding friction shoe (20A, 20B) and slides at described connecting rod (6).

12. as each described spray boom in the claim 1 to 11, it is characterized in that, be used to resist the location, described spring (16A, 16B) approximate horizontal ground that described spray boom (1) acts on around the pivot of described second articulated elements (8).

13. as each described spray boom in the claim 1 to 12, it is characterized in that, be used to resist described spray boom (1) around the pivot of described second articulated elements (8) and near the tie point (17A, 17B) that the described spring (16A, 16B) that acts on is being positioned at described second articulated elements (8) locate, each all is connected on the described connecting rod (6), so that act on described second articulated elements (8) with certain lever arm.

14. spray boom as claimed in claim 13, it is characterized in that, described tie point (17A, 17B) of each spring (16A, 16B) and the distance between described second articulated elements (8) are to adjust, so that the active force that described spring (16A, 16B) described relatively second articulated elements (8) applies can be adjusted.

15., it is characterized in that each spring (16A, 16B) is connected on the respective arms (1A, 1B) of described spray boom (1) in its other end as each described spray boom in the claim 1 to 14.

16. spray boom as claimed in claim 15 is characterized in that, each spring (16A, 16B) is connected on the respective arms (1A, 1B) of described spray boom (1) by traction element (15A, 15B), and this traction element is preferably the cable type.

17., it is characterized in that described spring (16A, 16B) has the comparatively feature of rigidity as each described spray boom in the claim 1 to 16.

18., it is characterized in that described spring (16A, 16B) and/or described additional springs (21A, 21B) are extension springs as each described spray boom in the claim 1 to 17.

19. as each described spray boom in the claim 1 to 18, it is characterized in that, be used to prevent described spray boom (1) to extend between described spray boom (1) and the described connecting rod (6), be positioned at described second articulated elements (8) top, preferred even be positioned at a bit (P1) of a distance of described first articulated elements (7) top so that these dampers converge to around the damper (18A, 18B) of the motion of described second articulated elements (8).

20., it is characterized in that described connecting rod (6) has a plurality of possible tie point that is used for described damper (18A, 18B), can be suitable for working condition so that prevent as each described spray boom in the claim 1 to 19.

21., it is characterized in that additional damper (24) is installed between described spray boom (1) and the described mounting (4) as each described spray boom in the claim 1 to 20.

22. a product sprays farm machinery (2), it is characterized in that, it comprises that each product sprays spray boom (1) in the claim 1 to 21.

23. product as claimed in claim 22 sprays farm machinery (2), it is characterized in that, it is mounted on the agricultural tractor or by the type that agricultural tractor drew, or self-propelled type.