JPH1042771A - Boom sprayer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a boom sprayer that is capable of preventing a spray tractor by locating spray booms in the front of the tractor, and a chemical tank, spray pump and hose reel in the rear of the tractor, and which is capable of preventing a plurality of spray nozzles divided into several sets from causing pressure variations even when any of the spray nozzle is closed in such configuration that respective spray nozzle sets are independently opened and closed. SOLUTION: This boom sprayer in such a configuration that a liquid chemical discharged from a spry pump P is branched at a branching manifold 15 to nozzles of a plurality of nozzle sets separated for respective booms comprises three-way cocks 31 provided between the branching manifold 15 and the spray nozzles to be able to turn ON and OFF the delivery of the liquid chemical to respective nozzle sets, and jet ports 41 to jet the liquid chemical inside the cocks in pressurized condition and return the liquid chemical to the chemical tank.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boom sprayer which is capable of spraying a wide range of a chemical solution in a single run when spraying a chemical solution on rice or vegetables.

[0002]

2. Description of the Related Art Conventionally, a technique relating to a boom sprayer mounted on a tractor has been known. However, in the conventional boom sprayer, a spraying boom is also mounted together with the chemical tank T and the spray pump P on the working machine mounting mechanism at the rear of the fuselage, and all the main devices constituting the boom sprayer are mounted at the rear of the tractor. Because it is mounted, the front of the aircraft becomes lighter, the balance is lost, and the spray boom is at the rear, so the operator has to turn many times to see the spray state behind. There was.

[0003]

According to the present invention, in order to solve such a problem of the prior art, the spraying boom B is disposed at the front of the fuselage so as to be easily controlled by an operator. The weight of the unit is increased so that the aircraft can be balanced without attaching a balance weight. Further, a mounting frame F on which the chemical solution tank T, the spray pump P, and the hose reel H on the rear side are mounted.
A mechanical stopper mechanism is provided to facilitate the attachment and detachment of the device, and to prevent the device from naturally descending when it is raised. Also, by attaching all the operating members for operating the front spraying boom B to the portion mounted on the rear mounting frame F, and detaching and attaching the boom sprayer unit, the operating unit can be simultaneously attached and detached. It is configured to be able to. Also, in the boom sprayer, when a part of the plurality of spray nozzles G is closed and the pressure of the other spray nozzles G changes, the chemical spray amount changes. The present invention solves this problem by providing a return injection port 41 in parallel with the three-way switching cock 31.

[0004]

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. In claim 1, the spray pump P
The chemical liquid discharged from the nozzle is branched at the branch table 15 and the chemical liquid is discharged to a set of spray nozzles G divided into a plurality of sets for each boom, and a three-way switching cock is provided between the branch table 15 and the spray nozzles G. 31 and the three-way switching cock 31
In this way, the discharge of the chemical solution to each group can be made ON-OFF, and when the three-way switching cock 31 is operated on the OFF side of the chemical solution, the chemical solution in the cock portion is sprayed in a pressure-applied state. A return nozzle 41 for returning to the tank T is provided.

According to a second aspect of the present invention, the chemical tank T according to the first aspect is configured to be liftable by a lift arm 11 of a tractor. And a front portion of the chemical solution tank T is formed with a concave portion Z so as to surround the periphery of the seat O of the tractor.

According to a third aspect of the present invention, the three-way switching cock 31 and the return injection port 41 of the first aspect are fixed to a part of the chemical liquid tank T located on the side of the seat O.

According to a fourth aspect of the present invention, in a configuration in which the spray boom B is supported on the front of the body of the tractor via the front hitch mechanism D so as to be able to move up and down, the boom raising / lowering cylinder L for moving the front hitch mechanism D up and down is electrically driven. The intermediate boom cylinder 21 that opens and closes the intermediate boom 2 is also an electric cylinder.

According to a fifth aspect of the present invention, there is provided a boom sprayer wherein the boom operating panel C for operating the boom lifting / lowering cylinder L and the intermediate boom cylinder 21 according to the fourth aspect is mounted on a chemical solution tank T at the rear.

[0009]

Next, an embodiment of the present invention will be described. FIG. 1 is a perspective view of the boom sprayer of the present invention in a state where the spray boom B is expanded to its maximum width, FIG. 2 is a perspective view of the boom sprayer in a state where the spray boom B is folded to the side of the fuselage, FIG. 2 is a right side view of the state shown in FIG. 2; FIG. 4 is a plan view of the boom sprayer;
FIG. 6 is a front view of the boom sprayer device, FIG. 6 is a rear view of the boom sprayer device, FIG. 7 is a perspective view of a front hitch mechanism for supporting the spray boom B so as to be able to move up and down, and FIG.
Is a side view of a portion of a mounting frame F which is disposed at a rear portion of the boom sprayer device and on which a chemical solution tank T, a spray pump P and a hole reel H are mounted. FIG. 9 also shows a mounting frame F, a spray pump P and a chemical solution tank T. FIG.

FIG. 10 is a rear view of a portion of a hall reel H, a spray pump P, and a mounting frame F, and FIG.
And FIG. 12 is a view showing the structure of a bent portion of the left middle boom 2L and FIG. 12 is a right middle boom 2R and a right end boom 3R.
FIG. 13 is a perspective view showing a state where the right intermediate boom 2R and the right end boom 3R are extended, FIG.
FIG. 15 is a side view showing a state in which a spray hose A for supplying a chemical solution from the rear switching valve mechanism V to the injection port of the front spray boom B is disposed below the step S. FIG. 15 is a side view showing the switching valve mechanism V and the main valve M. FIG.
6 is a perspective view of a boom operation panel C, FIG. 17 is a perspective view of a part of a boom suspension chain 4 and a spare seedling mounting table 5, and FIG. 18 is a part in which a chemical solution tank T and a mounting frame F are mounted on a tractor. FIG. 19 is a side view showing the mechanism, FIG. 19 is a drawing showing a circuit from discharge of a chemical solution in a chemical solution tank T by a spray pump P to spraying from a nozzle K, and FIG. A front view of a drawing in which the three-port spray nozzle G is attached and can be switched in conjunction with the linkage link 38,
FIG. 21 is a side view of FIG. 20, FIG. 22 is a side view of a configuration in which a weeding plate 39 is provided on the front surface of the boom lower stand 24, and FIG. 23 is a front view of FIG.

The overall configuration of FIGS. 1 to 6 will be described. This machine, which is a tractor, has front wheels 18 and 18 and rear wheels 14.
-It is a four-wheel tractor equipped with 14. A spray boom B is mounted via a front hitch mechanism D to a front bumper 19 at the front of the four-wheel tractor.
Further, spare seedling mounts 5 are arranged on the left and right sides of the bonnet N of the tractor, and the boom suspension chain 4 extends from the spare seedling mount 5 to suspend the spray boom B in a folded state. The spraying boom B supports the fixed boom 1 by a front hitch mechanism D, and moves up and down by a boom elevating cylinder L provided on the front hitch mechanism D.

A left middle boom 2L and a right middle boom 2R are foldably connected to the left and right of the fixed boom 1, and a left end boom 3L is foldably connected to a tip of the left middle boom 2L. Intermediate boom 2R
The right end boom 3R is foldably connected to the end of the boom. At the rear of the tractor, a mounting frame F is mounted on a directly mounted work machine mounting device, and a chemical tank T, a hose reel H, a spray pump P, and the like are mounted on the mounting frame F. Spray pump P on the mounting frame F
Is driven by connecting a PTO shaft projecting from the rear of the tractor to the spray pump P. A chemical tank T mounted on the mounting frame F is configured to be mounted and liftable by a lift arm 11 of a tractor.
The front of the chemical solution tank T is located above the fender Y in a state where the chemical solution tank T is raised and arranged at a fixed position. A boom operation panel C, a switching valve mechanism V, and a main valve M are fixed to the chemical liquid tank T above the fender Y. Further, the chemical solution tank T is formed in a concave portion Z in which the periphery of the seat O is hollowed out, and the chemical solution tank T is configured to surround the seat O. As a result, the capacity of the chemical liquid tank T is made as large as possible, so that the front-back balance is improved.

The width of the chemical solution tank T mounted on the mounting frame F is set to be equal to or equal to the width outside the rear wheels 14, and the width of the mounting frame F is set to be equal to the width of the rear wheels 14.
It is configured to fit within the width inside. Below the mounting frame F, caster support wheels 16, 16, 17, and 17 that can be folded in the front-rear direction are supported. The caster support wheels 16, 16, 17, 17 are supported at the lower ends of the caster support rods 6, 7, and one of the caster support rods 6, 7 pivots rearward and the other pivots forward. , And can be stored on the lower surface of the mounting frame F.

A hose reel H is mounted on the mounting frame F. On the hose reel H, a switching device and a draw-out hose for manually spraying the unsprayed portion, instead of spraying with the three-port spray nozzle G of the spray boom B, are wound up and arranged. 2 and 3
As shown in the figure, the left middle boom 2L and the right middle boom 2R
The right end boom 3R and the left end boom 3L are locked to prevent the descent by the boom suspension chain 4 suspended from the upper part of the spare seedling mounting table 5 in a state of being folded to the side of the tractor. I have.

FIG. 7 shows a front hitch mechanism D mounted on the front bumper 19 of the tractor. The front hitch mechanism D includes left and right parallel link mechanisms 20 and a boom elevating cylinder L at a position of a center top link. The boom raising / lowering cylinder L is configured by an electric cylinder, and is configured to extend and contract by rotating the motor forward and reverse by a tractor power supply. In the conventional device, the spray boom was arranged at the rear of the tractor, so that the spray boom could be moved up and down by the hydraulic device of the tractor. In the case of the present invention, the spray boom B was moved in front of the tractor. Because it was placed in the department
Since the hydraulic lifting device cannot be used, the boom lifting cylinder L and the intermediate boom cylinder 21 are configured as electric cylinders, and this operating device is disposed as a boom operation panel C on a side portion of a seat of the chemical liquid tank T. ing.

As shown in FIGS. 2 and 11, below the fixed boom 1, there are left and right boom bottom stands 24 for the fixed boom 1 to be placed on the ground. . Also, the left middle boom 2L and the right middle boom 2R, which are foldably supported on the left and right sides of the fixed boom 1, are also provided with boom lower surface stands 23 at the distal ends. And fixed boom 1 and left middle boom 2L
As shown in FIG. 11, an intermediate boom cylinder 21 is interposed in the bent portion, and the intermediate boom cylinder 21 expands and contracts by the power of the tractor to fold and open and close the left intermediate boom 2L and the right intermediate boom 2R. It is carried out.

An urging spring 22 is interposed between the cylinder bracket 25 on which the intermediate boom cylinder 21 is interposed and the intermediate boom base bracket 26, and the left intermediate boom 2L and the left When an obstacle is engaged with the tip boom 3L, the biasing spring 22 bends to allow the boom to escape and rotate. As shown in FIG. 12, a right end boom 3R is pivotally supported at the end of the right middle boom 2R so as to be freely foldable, and the right end boom 3R is configured to be manually opened and closed by an operator. And, between the right middle boom 2R and the right end boom 3R, a fulcrum-over spring 27 is provided.
Are interposed, and are spring-biased to stabilize the extended state and the folded state.

A spray boom B composed of the fixed boom 1, the left middle boom 2L, the right middle boom 2R, the right end boom 3R and the left end boom 3L is provided with six sets of three-port spray nozzles G. Therefore, since there are 5 unit booms, 30 spare seedling mounting tables 5 are additionally provided. The spray hose A from the spray pump P is branched in the direction of each of the five booms at the branch stand 15 and the three-way switching cock 31 fixed to the cock base Q.
・ 32 ・ 33 ・ 34 ・ 35 stop each separately
It is possible to switch the spray.

The three-port spray nozzle G integrally forms different types of spray nozzles 28, 29, and 30 which can be manually rotated. When the chemical pump is not discharged from the spray pump P, The rotation can be easily performed by grasping and rotating the three-port spray nozzle G by hand. Then, among the spray nozzles 28, 29, and 30, the spray nozzles 28, 29, and 30 on the side that matches the discharge port of the chemical solution and face downward.
Is sprayed.

In FIG. 14, below step S,
There is disclosed a configuration in which a spray hose A in which five chemical liquid discharge hoses are integrated is disposed. The spray hose A is connected to the switching valve mechanism V and the three-way switching cock 31.3 from the branch stand 15.
This is a hose for reaching each spraying boom B after passing through 2, 33, 34, and 35, and spraying forward from below step S through below the hood N so as not to hinder the operator from getting on and off. It is configured to reach the boom B. As shown in FIGS. 4 and 5, the fixed boom 1 is configured to have a width extending to the outside of the left and right front wheels 18 and the left intermediate boom 2L and the left end boom 3L folded right and left of the fixed boom 1 are provided. The left front boom 3L is folded upward, and the left middle boom 2L is folded downward, and is folded outside the front wheels 18 and the rear wheels 14. The spare seedling mounting table 5 is arranged on both sides of the bonnet N.

As shown in FIG. 15, a part of the chemical solution tank T is arranged so as to protrude above the fender on the right side of the tractor seat, and the switching valve mechanism V and the three-way switching cocks 31, 32, 33 are provided inside the tank. 34 and 35 are arranged. A main valve M is disposed behind the switching valve mechanism V. The switching valve mechanism V is disposed on the tractor outside the work implement lifting / lowering operation panel 36.
A boom operation panel C is disposed on the upper surface of the chemical liquid tank T on the side of the switching valve mechanism V. The boom operation panel C has a fixed boom elevating switch 38 for operating a boom elevating cylinder L, and a left and right middle switch. Left and right boom open / close switches 39/40 for operating the boom cylinders 21/21 are provided.

In FIG. 17, the boom suspension chain 4 extends from the upper end of the spare seedling mounting table 5 and
A configuration for suspending the L and the right middle boom 2R is disclosed. 8 and 9, the mounting frame F, the hose reel H, the caster support rods 6, 7 and the caster support wheels 16, 16, 17, 17 are shown. The configuration of the mounting frame F and the device for directly mounting a tractor on a work implement is shown in FIG. The mounting frame F is mounted on the recess 13a of the directly mounted hitch 13 on the tractor side.
Insert the locking pin 8a at the tip of the mounting link 8 on the side of
The locking pin 8a is provided by the locking pin 13b of the directly mounted hitch 13.
Is prevented. The lift link 12 protrudes forward from the upper part of the mounting frame F, and the tip of the lift link 12 is pivotally connected to the rear end of the lift arm 11 of the tractor. When the mounting frame F is pulled through the lift link 12 by lifting the lift arm 11, the caster support wheels 16, 16, 17, and 17 rotate to smoothly engage the locking pin 8 a of the mounting link 8, The hitch 13 can be fitted into the recess 13a.

When the locking pin 8a is fitted into the recess 13a, the locking pin 13b is inserted and fixed, and the lift arm 11 is further raised.
2 by the parallel link mechanism supported by the mounting frame F
Then, the chemical liquid tank T and the like start rising. With the caster support wheels 16, 16, 17, 17 floating, the caster support rods 6, 7 are rotated back and forth to fold the caster support wheels 16, 16, 17, 17 into the state of FIG. . When the mounting frame F is lifted by the lift arm 11 and is hydraulically locked, there is a possibility that the mounting frame F will gradually descend due to oil pressure leakage over a long period of time. Provided. The mechanical stopper rod 9 has a rear portion pivotally supported on the upper surface of the mounting link 8, and a front portion can be locked to a link bracket 10 of the tractor by a pin. By locking the mechanical stopper rod 9 to the link bracket 10, the mounting frame F is configured to be unable to descend below that. The mechanical stopper rod 9 constitutes a turn buckle mechanism, and can adjust the lowest position of the mounting frame F.

In FIG. 19, the path from the chemical tank T to the three-port spray nozzle G will be described. The chemical solution supplied from the chemical solution tank T is discharged by the spray pump P and supplied to the branch table 15 via the main valve M. A line filter 50 is provided between the chemical solution tank T and the spray pump P, and a line filter 51 is also arranged between the spray pump P and the spray hose A to form a two-stage filter. The branch table 15 branches at every five booms, and then passes through the three-way switching cocks 31, 32, 33, 34, and 35 of the switching valve mechanism V provided on the cock base Q.
In the three-way switching cocks 31, 32, 33, 34, and 35, the discharge state of the six three-port spray nozzles G can be opened and closed for every five booms.

The three-way switching cocks 31, 32, 33, 34
At 35, the chemical liquid on the closed side is sprayed and discharged into the cock base Q via the return injection ports 41, 42, 43, 44, 45 provided in the cock base Q, and the chemical liquid tank T The bypass is configured to return to Each of the return injection ports 41, 42, 43, 44, and 45 is configured to provide the same resistance as the resistance when it is discharged from the six three-port spray nozzles G. Even when any one of the mouth spray nozzles G is closed, the discharge pressure applied to the other three mouth spray nozzles G is configured to be constant.

On the mounting frame F, a jet pump R used for injecting a chemical from a chemical adjustment tank disposed on the ground is accommodated in the chemical tank T. The jet pump R includes a flexible hose,
It is constituted by a jet nozzle portion, and by discharging pressure oil from the spray pump P to the jet nozzle portion, a negative pressure portion is generated inside the jet nozzle,
The configuration is such that the chemical solution can be sucked from the adjustment tank on the ground and drawn up to the chemical solution tank T. Since the jet pump R is not normally used, it can be stored in the rear part of the mounting frame F. Further, since the jet pump R is configured to pump water using the discharge pressure of the spray pump P as it is, there is no need for an engine or a motor and only the jet nozzle and the flexible pipe are used.

In FIG. 20 and FIG.
The three-port spray nozzle G disposed below the
1 illustrates a configuration that can be switched at one time via the interlocking arm 37. Six sets of the three-port spray nozzles G are provided on the fixed boom 1 and six other sets are provided on the left intermediate boom 2L.
It is configured so that all can be switched by operating the lever once with a wire or a wire. In order to prevent the spray from the three-port spray nozzle G from being hung on the operator on the tractor, an explosion-preventing droop 48 is provided at the rear of the fixed boom 1 to prevent the mist of the chemical from flowing to the operator. I do not have it.

In FIG. 22, since the lower boom stands 24 are arranged on the lower surface of the fixed boom 1, the lower boom lower stands 24, 24 are sprayed between rice and vegetables while spraying. May come into contact with rice and vegetables. If contact is made, the spray boom B is damaged and the crop is damaged at the same time.
A weeding plate 39 is provided in front of 4.24 so as to avoid interference between the boom lower surface stands 24 and the crop.

[0029]

As described above, the present invention has the following advantages. As described in claim 1, in a configuration in which the chemical liquid discharged from the spray pump P is branched at the branch table 15 and the chemical liquid is discharged to a set of spray nozzles G divided into a plurality of sets for each boom, A three-way switching cock 31 is provided between the spray nozzles G, and the three-way switching cock 31 turns ON-OF the discharge of the chemical solution to each set.
F, and the three-way switching cock 31
Is operated, the chemical liquid in the cock portion is sprayed in a state where pressure is applied, and the return nozzle 41 is provided to return to the chemical liquid tank T. Therefore, a plurality of sets of spray nozzles G are arranged, and for each set, Three-way switching cock 31.3 that can stop spraying
In the case where 2, 33, 34, 35 are provided, by closing a part of the spray nozzle G, the pressure of the other part may increase and the spray amount may change. In the case of the three-way switching cock 31, 32, 33, 34, 35
The direction is changed, and the closed portion is returned to the injection holes 41 and 42.
At 43, 44, and 45, the pressure is applied and the liquid is returned to the chemical liquid tank T, so that even if a part of the spray nozzle G is discharged, the discharge pressure of the remaining spray nozzle G is not affected. As a result, uniform spraying became possible.

According to a second aspect of the present invention, the chemical solution tank T according to the first aspect is configured to be liftable by a lift arm 11 of a tractor. And the front of the chemical solution tank T is formed with a concave portion Z so as to surround the periphery of the seat O of the tractor, so that the chemical solution tank T mounted on the tractor is arranged as far forward as possible. And the capacity of the chemical tank T is 4 as long as the stability is maintained.
The capacity was as large as 00 kilograms.

Since the three-way switching cock 31 and the return nozzle 41 are fixed to a part of the chemical tank T located on the side of the seat O, the components constituting the boom spray device are as follows. Since it can be attached and detached together with the chemical liquid tank T, the parts related to the boom spray device do not remain on the tractor after the boom spray device is removed. Further, even if the switching valve mechanism V and the boom operation panel C are mounted on the chemical liquid tank T, they are located on the side surface of the seat O, so that the operability can be improved.

According to a fourth aspect of the present invention, in a configuration in which the spray boom B is supported at the front of the body of the tractor via the front hitch mechanism D so as to be able to move up and down, the boom elevating cylinder L for moving the front hitch mechanism D up and down is electrically driven. Since the intermediate boom cylinder 21 that opens and closes the intermediate boom 2 is also an electric cylinder, the installation of the spray boom B at the front of the tractor makes it impossible to move up and down using the tractor's hydraulic device. However, by using an electric cylinder using the power of the tractor as in the present invention, the lifting and lowering and folding of the spray boom B can be electrically operated while sitting on the seat O. is there.

According to a fifth aspect, the boom operating panel C for operating the boom lifting / lowering cylinder L and the intermediate boom cylinder 21 according to the fourth aspect is mounted on the chemical solution tank T at the rear, so that the spraying boom B is moved to the front of the tractor. Despite being unable to move up and down by the lift arm 11, the electric cylinder and the boom operation panel C were arranged. C can now be operated.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a spray boom B is widened to a maximum width in a boom sprayer of the present invention.

FIG. 2 is a perspective view of the boom sprayer device in a state where the spray boom B is folded to the side of the fuselage.

FIG. 3 is a right side view of the state of FIG. 2;

FIG. 4 is a plan view of the boom sprayer.

FIG. 5 is a front view of the boom sprayer.

FIG. 6 is a rear view of the boom sprayer.

FIG. 7 is a perspective view of a front hitch mechanism that supports the spray boom B so as to be able to move up and down.

FIG. 8 is a side view of a portion of a mounting frame F which is disposed at a rear portion of the boom sprayer and on which a chemical solution tank T, a spray pump P, and a hole reel H are mounted.

FIG. 9 is a perspective view of a mounting frame F, a spray pump P, and a chemical tank T in the same manner.

FIG. 10 is a rear view of a part of the hall reel H, the spray pump P, and the mounting frame F.

FIG. 11 is a view showing a structure of a bent portion of a fixed boom 1 and a left intermediate boom 2L.

FIG. 12 is a perspective view of a bending point of the right middle boom 2R and the right end boom 3R.

FIG. 13 is a perspective view of a state where a right intermediate boom 2R and a right end boom 3R are extended.

FIG. 14 is a side view showing a state in which a spray hose A for supplying a chemical solution from a switching valve mechanism V at a rear portion to a nozzle at a front spray boom B is disposed below step S;

FIG. 15 is a plan perspective view showing an arrangement of a switching valve mechanism V and a main valve M.

FIG. 16 is a perspective view of a boom operation panel C.

FIG. 17 is a perspective view of a boom suspension chain 4 and a spare seedling mounting table 5;

FIG. 18 is a side view showing a mechanism for mounting a chemical solution tank T and a mounting frame F on a tractor.

FIG. 19 is a diagram showing a circuit from discharge of a chemical solution in a chemical solution tank T by a spray pump P to spraying from a nozzle K;

FIG. 20 is an explosion-proof droop 48 behind a three-port spray nozzle G;
FIG. 4 is a front view of a drawing in which the three-port spray nozzle G is switchable in conjunction with an interlocking link 38.

FIG. 21 is a side view of FIG. 20;

FIG. 22 is a side view of a configuration in which a weeding plate 39 is provided on the front surface of the boom lower surface stands 24;

FIG. 23 is a front view of FIG. 22;

[Explanation of symbols]

 A Spray hose B Spray boom C Boom operation panel D Front hitch mechanism F Mounting frame G 3-port spray nozzle H Hose reel L Boom elevating cylinder M Main valve N Bonnet P Spray pump Q Cock stand R Jet pump S Step T Chemical tank

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[Procedure amendment]

[Submission date] August 22, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0026

[Correction method] Change

[Correction contents]

On the mounting frame F, a jet pump R used for injecting a chemical from a chemical adjustment tank disposed on the ground is accommodated in the chemical tank T. The jet pump R includes a flexible hose,
By discharging the discharge liquid from the spray pump P to the jet nozzle portion, a negative pressure portion is generated inside the jet nozzle, and the chemical solution from the adjustment tank on the ground is discharged. It is configured to be able to suck and suck up to the chemical solution tank T. Since the jet pump R is not normally used, it can be stored in the rear part of the mounting frame F. Further, since the jet pump R is configured to pump water using the liquid discharged from the spray pump P as it is, it does not need an engine or a motor, and is constituted only by a jet nozzle and a flexible pipe.

[Procedure amendment]

[Submission date] August 22, 1996

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Figure 2

[Correction method] Change

[Correction contents]

FIG. 2

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] Figure 3

[Correction method] Change

[Correction contents]

FIG. 3

[Procedure amendment 3]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masao Shimamoto 767 Umena, Mishima-shi, Shizuoka New Delta Industrial Co., Ltd.

Claims (5)

[Claims] 1. A structure in which a chemical solution discharged from a spray pump P is branched at a branch table 15 and a chemical solution is discharged to a set of spray nozzles G divided into a plurality of sets for each boom. A three-way switching cock 31 is provided between the nozzles G. The three-way switching cock 31 enables the discharge of the chemical solution to each set ON-OFF, and when the three-way switching cock 31 is operated on the OFF side of the chemical solution. A boom sprayer provided with a return injection port 41 for spraying the chemical in the cock portion under pressure and returning it to the chemical tank T. 2. The chemical solution tank T according to claim 1 is configured to be liftable by a lift arm 11 of a tractor, and a front portion of the chemical solution tank T is disposed on the fender Y in a state where the chemical solution tank T is lifted by the lift arm 11. A boom sprayer characterized in that a recess Z is formed at the front of the chemical solution tank T so as to surround the periphery of the seat O of the tractor. 3. A boom sprayer device wherein the three-way switching cock 31 and the return injection port 41 according to claim 1 are fixed to a part of a chemical solution tank T located on a side of the seat O. 4. A configuration in which a spray boom B is supported on a front part of a body of a tractor via a front hitch mechanism D so as to be able to ascend and descend, and a boom elevating cylinder L for elevating and lowering the front hitch mechanism D is an electric cylinder. A boom sprayer, wherein the intermediate boom cylinder 21 for opening and closing the boom 2 is also an electric cylinder. 5. A boom operating panel C for operating the boom lifting cylinder L and the intermediate boom cylinder 21 according to claim 4.
A boom sprayer device, which is mounted on a chemical solution tank T at the rear.