JPH0534785Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a boom sprayer for spraying a chemical solution onto a field, and specifically relates to a support structure for a side boom that can be expanded and folded.

[Conventional technology]

A boom sprayer is used for spraying a chemical solution in a field, and includes a side boom that expands laterally when spraying a chemical solution. When storing the boom sprayer, the side boom is folded along the side of the boom sprayer body and the tip is tilted forward so that the storage space for the boom sprayer is as small as possible. .

In the boom sprayer disclosed in Japanese Utility Model Application No. 63-103769, the base end of the side boom is connected to the center boom via a ball joint in order to move the side boom between the expanded position and the retracted position. At the same time, both ends of the hydraulic cylinder are rotatably connected to the side boom and the center boom, allowing the hydraulic cylinder to expand and contract. Further, in order to smoothly move the side booms between the expanded position and the retracted position, a guide groove of a predetermined shape is formed in the ball joint that connects the side booms and the center boom.

Furthermore, in the boom sprayer disclosed in Japanese Utility Model Application Publication No. 61-40169, the side boom is expandably supported by a shaft whose axis extends in the left and right horizontal directions, and the shaft is rotatable around the axis of the boom sprayer. It is supported by the support of the main body, and a hydraulic cylinder is connected at both ends to the proximal end of the side boom and the end of the support through pin joints. The side boom is expanded and folded by expansion and contraction of the hydraulic cylinder, and the side boom is tilted in the folded position by rotation of the shaft relative to the support.

[The problem that the idea attempts to solve]

Utility Model Application No. 63-103769 and Utility Model Application No. 61-40169
The problems of the conventional boom sprayer disclosed in the above publication are listed below.

(a) Hydraulic cylinders, hydraulic piping, and hydraulic control devices are required, making the entire system complex, large, and heavy, increasing costs. In particular, Utsukai Showa 63-
The boom sprayer of Publication No. 103769 requires expensive ball joints, etc. at the joint between the side boom and center boom, the end of the hydraulic cylinder, etc., and requires processing to form a guide groove in the ball joint. It becomes troublesome.

(b) Since the amount of expansion and contraction of the hydraulic cylinder is fixed, it is difficult to change the inclination angle of the side boom to an appropriate value when the side boom is in its retracted position.

(c) The orientation of the outer part attached to the side boom cannot be adjusted in the extended position of the side boom.

(d) When storing the boom sprayer, it would be advantageous if the side boom could be removed from the boom sprayer body and stored, since the storage space would be reduced, but it is difficult to remove the side boom from the boom sprayer body.

The object of the invention of claim 1 is to provide a boom sprayer that moves a side boom between an expanded position and a retracted position, omitting complicated structures such as a hydraulic cylinder and a ball joint, and when retracting the boom sprayer main body. To provide a boom sprayer from which a side boom can be removed.

A further object of the invention is to smooth the relative rotation around the axis in the fitted connection.

It is an object of the present invention to provide a boom sprayer that can flexibly change the inclination angle of the side boom when the side boom is in its retracted position.

An object of the present invention is to provide a boom sprayer in which the direction of the nozzle attached to the side boom can be adjusted appropriately when the side boom is in the expanded position.

[Means to solve the problem]

This invention will be explained using reference numerals in the drawings that correspond to the embodiments.

In the boom sprayer 14 of the first aspect, the fitting portion 39 is detachable in the axial direction and allows relative rotation around the axis, and the fitting portion 39 has a fitting portion 39 that rotates around a straight line perpendicular to the axis of the fitting portion 39. A swinging coupling portion 53 that allows relative swinging is connected in series and interposed between the base end of the side boom 24 and the support body 30. The lock pin 42 is connected to the fitting joint 39.
The pin hole 34 is inserted into the pin hole 34 in a freely insertable and removable manner, and restrains the fitting portion 39 from coming off in the axial direction and from relative rotation around the axis.

In the boom sprayer 14 according to the second aspect of the present invention, an annular guide groove 32 extending in the circumferential direction is formed in the circumferential portion of the inner portion 30 of the fitting coupling portion 39 . Lock pin 4
2 is movably supported on the outer part 38 of the fitting joint 39, biased towards the annular guide groove 32 by a spring 48, and guided in the annular guide groove 32 at its tip.

In the boom sprayer 14 according to the third aspect, the fitting coupling part 39 allows relative rotation around an axis extending horizontally in the left-right direction, and the fitting coupling part 39 allows the support body 30 and the swing coupling part 5 to rotate relative to each other around an axis extending horizontally in the left-right direction.
3 are connected.

In the boom sprayer 14 according to the fourth aspect, a plurality of pin holes 34 are formed at appropriate intervals in the relative rotation direction of the fitting coupling portion 39.

[Effect]

In the invention of claim 1, when the lock pin 42 is pulled out from the fitting joint 39, the fitting joint 39
can be freely removed in the axial direction and relatively rotatable around the axis. Accordingly, when the side boom 24 is removed from the boom sprayer main body and stored, the fitting coupling portion 39 is pulled out in the axial direction and separated. In addition, when changing the side boom 24 to the expanded position or the retracted position, relative rotation is performed at the fitting joint 39, and
The swinging coupling portion 53 is caused to swing relative to a straight line perpendicular to the axis of the fitting coupling portion 39 .
As a result, when the side boom 24 is retracted, the tip part is tilted forward from the vertical position and is in an inclined position along the side of the main body of the boom sprayer 14, and when expanded, the side boom It will be in a horizontal position. The lock pin 42 is inserted into the pin hole 34 of the fitting joint 39 to restrict relative rotation in the fitting joint 39. Therefore, when the side boom 24 is expanded, the side boom 24 is prevented from rotating around its axis.

In the invention of claim 2, when relative rotation is performed in the fitting joint portion 39, the lock pin 42 is rotated by the spring 4.
8, the tip end is held in the annular guide groove 32 in the inner portion 30 of the boom sprayer body of the fitting coupling portion 39. In this way, the tip of the lock pin 42 is guided by the annular guide groove 32 of the inner portion 30, and relative rotation in the fitting joint 39 is performed.

In the third aspect of the present invention, relative rotation is performed in the fitting coupling portion 39 around an axis extending horizontally in the left-right direction. This allows the side boom 24
is changed in position around an axis extending horizontally in the left-right direction, and the side boom 24 changes its inclination angle in its retracted position.

In the fourth aspect of the present invention, a pin hole 34 is selected and a lock pin 42 is inserted into the selected pin hole 34. As a result, the fitting coupling portion 39 is restrained at a rotational position corresponding to the pin hole 34 into which the locking pin 42 is inserted, and the rotational position of the side boom 24 around the axis is adjusted in the expanded position.

〔Example〕

This invention will be described below with reference to embodiments shown in the drawings.

FIG. 8 is a schematic perspective view of the boom sprayer 14 mounted on the agricultural tractor 10. The agricultural tractor 10 is self-propelled by front, rear, left, and right tires 12, and the boom sprayer 14 is detachably attached to the rear of the agricultural tractor 10 via a well-known three-point link or the like. Boom sprayer 14
The device includes a chemical solution tank 16 for storing a chemical solution, a rectangular frame portion 18, and a boom support 20 fixed to the frame portion 18 so as to be adjustable in height. The center boom 22 extends horizontally and is attached to the boom support 2
Fixed to 0. 2 side booms 24
The center boom 22 can be expanded and retracted.
The nozzle pipe 26 has a base end rotatably connected to both ends of the nozzle pipe 26, and is suspended from the center boom 22 and the side booms 24, and extends along the lower surfaces thereof. The chemical liquid in the chemical liquid tank 16 is pumped to the nozzle pipe 26 by a pump (not shown), and is ejected from each nozzle 60 (FIG. 7) of the nozzle pipe 26.

Figures 1 and 2 show the side boom 24.
FIG. Since the support structures of the left and right side booms 24 are the same, only one support structure will be described. The center boom 22 extends horizontally from side to side, and has a cylindrical end portion 30.
have. The annular guide groove 32 has a cylindrical end portion 3
It is formed on the circumference of the cylindrical end 30 so as to go around in the circumferential direction of the cylindrical end 30 (see the perspective view of the cylindrical end 30 in FIG. 4). The pin hole 34 is formed in the annular guide groove 32 to penetrate the cylindrical end portion 30 and extends substantially vertically. Bracket 36 has a cylindrical portion 38 that fits into cylindrical end 30 .
8 indicates the cylindrical end 3 in the axial direction of the cylindrical end 30.
0, and the cylindrical end 30
It is rotatable relative to the cylindrical end 30 around the axis of the cylinder. The cylindrical end portion 30 and the cylindrical portion 38 constitute a fitting joint portion 39 .

FIG. 3 is a vertical cross-sectional view of the support structure for the center boom 22 in the annular guide groove 32. In FIGS.
The lock pin 42 is supported by the spring support member 40 and the insertion hole 44 of the cylindrical portion 38 so as to be guided in a direction perpendicular to the axial direction of the cylindrical end portion 30 . The C-ring 46 is fitted at an intermediate position in the axial direction of the lock pin 42, and the compression coil spring 48 is connected to the spring support member 40 and the C-ring 4.
6, the lock pin 42 is fitted in the radial direction of the cylindrical end 30 to urge the lock pin 42 toward the cylindrical end 30. When the lock pin 42 is inserted into the pin hole 34 of the cylindrical end 30, the bracket 36 is prevented from coming off from the cylindrical end 30 in the axial direction of the cylindrical end 30, and the cylindrical end Relative rotation between the cylindrical end 30 and the bracket 36 about the axis of the section 30 is restrained.

Again, in FIGS. 1 and 2, the coupling pin 5
0 extends in a direction perpendicular to the axis of the center boom 22, and the side boom 24 is arranged so that the side boom 24 can swing freely around the axis of the coupling pin 50.
4 to the outer end of bracket 36. The stopper 52 contacts the side surface of the base end of the side boom 24 and prevents the tip of the side boom 24 from swinging downward from the horizontal axis of the center boom 22 when the side boom 24 is expanded. . The coupling pin 50 constitutes a swinging coupling portion 53 between the side boom 24 and the bracket 36.

The lock pin 42 is inserted into the insertion hole 44 of the cylindrical end portion 30.
By swinging the side boom 24 around the axis of the coupling pin 50 in the inserted state, the side boom 24 is moved in a plane perpendicular to the axis of the coupling pin 50, which is a substantially vertical plane in this embodiment. oscillate within. When spraying the chemical liquid from the nozzle 60 (FIG. 7), the side boom 24 is placed in a position that extends horizontally to the side of the boom sprayer 14.

FIG. 5 is a view showing the state of the boom sprayer 14 mounted on the agricultural tractor 10 when the boom sprayer 14 is being moved by the agricultural tractor 10, as viewed from the rear of the boom sprayer 14.
The two rear boom receivers 54 are fixed at a predetermined height at the rear of the boom sprayer 14.
The side boom 24 is supported at an angle. The two side boom supports 56 are fixed to the left and right sides of the chemical tank 16, protruding outward. When the boom sprayer 14 is mounted on the agricultural tractor 10 and moved, the side boom 24 is swung in a vertical plane about the axis of the connecting pin 50 with the lock pin 42 remaining inserted in the pin hole 34 of the cylindrical end 30, and supported by the rear boom support 54. In this way, the left and right side booms 24 are supported by the rear boom support 54 in a crossed state as shown in FIG.

FIG. 6 is a side view of the boom sprayer 14 when the side boom 24 is in the retracted position. When retracting the side boom 24, the lock pin 42 is displaced outward against the compression coil spring 48.
Remove the lock pin 42 from the pin hole 34. This allows the bracket 36 to rotate relative to the cylindrical end 30 around the axis of the cylindrical end 30. After removing the lock pin 42 from the pin hole 34,
When the pull-out force of the lock pin 42 is released, the lock pin 42 is urged toward the cylindrical end portion 30 by the urging force of the compression coil spring 48, and the tip thereof is positioned within the annular guide groove 32. In this way, the cylindrical end 3
When the bracket 36 is rotated around the zero axis, the bracket 36 rotates while the tip of the lock pin 42 is guided by the annular guide groove 32. To place the side boom 24 in the retracted position as shown in FIG. , the side boom 24 is tilted in a vertical plane, the side boom 24 is brought down from the upright position forward, and the side boom 24 is received by the side boom receiver 56 . Thereby, the tip of the side boom 24 is lowered, and the height of the boom sprayer 14 when stored can be lowered. Since the bracket 36 is rotatable at any angle around the axis of the cylindrical end 30, the side boom receiver 56
By lowering the height, the height of the tip of the side boom 24 can be lowered by placing the side boom 24 in the retracted position at an inclined angle.

When the side boom 24 is removed from the center boom 22 and stored, the lock pin 42 is removed from the insertion hole 44 in the cylindrical portion 38 of the bracket 36. Thereby, the cylindrical portion 38 has a cylindrical end portion 30
The cylindrical portion 38 is pulled out from the cylindrical end 30 and the bracket 36 is separated from the cylindrical end 30. Thereby, the side boom 24 can be separated from the center boom 22 and stored separately from the boom sprayer main body.

Figures 7a and 7b show different rotational positions of the side boom 24 about its axis. The nozzle 60 is connected to the nozzle pipe 26 (eighth
(Figure) are installed at appropriate intervals in the longitudinal direction and eject a chemical solution. In the support structure shown in Figure 1, the pin holes 34 are 1
However, in the annular guide groove 32, pin holes 34 penetrating in the diametrical direction of the cylindrical end portion 30 are provided at appropriate intervals in the circumferential direction of the cylindrical end portion 30, and a lock pin 42 is inserted into any pin hole 34. By inserting it, the side boom 24 can be fixed at any rotational position around the horizontal axis in the left-right direction. As a result, the rotational position of the side boom 24 around the horizontal line in the left-right direction is adjusted as shown in FIGS.
The spray angle of the chemical liquid from the nozzle 60 can be adjusted appropriately by changing the direction of the nozzle 60.

In the embodiment shown in FIG. 1, the center boom 22 side and the bracket 36 side of the fitting joint portion 39 are the cylindrical end portion 30 and the cylindrical portion 38, respectively, but in reverse, the center boom 22 side and the bracket 36 side are The cylindrical portion 38 and the cylindrical end portion 30 may be formed on the 36 side, respectively.

In the embodiment shown in FIG. 1, the fitting joint 39 and the swing joint 53 are connected in series on the center boom 22 side and the side boom 24 side, respectively.
Conversely, the center boom 22 side and the side boom 24
The side is a swing joint portion 53 and a fitting joint portion 39.
That is, the bracket 36 is fitted to the side boom 24 side so as to be rotatable about the axis of the side boom 24, and is connected to the center boom 22 side so as to be swingable about an axis perpendicular to the axis of the side boom 24. In this case, it is difficult to adjust the tilt angle of the side boom 24 when it is in the retracted position, but it is possible to adjust the angle of the nozzle 60 when the side boom 24 is in the deployed position.

[Effect of idea]

In the invention of claim 1, the proximal end of the side boom and the support such as the center boom have a fitting connection part that is freely removable in the axial direction and allows relative rotation around the axis, and this fitting connection part. are coupled to each other via a series connection with an oscillating connection which allows relative oscillation about a straight line perpendicular to the axis of the . Therefore, due to the disconnection in the axial direction at the fitting joint,
The side boom can be separated from the boom sprayer body, and the side boom can be stored separately from the boom sprayer body.

Further, in the invention of claim 1, the relative rotation at the fitting joint and the relative rocking at the swing joint allow the side boom to move between the expanded position where it extends to the side of the boom sprayer and the side of the boom sprayer main body. It is possible to move between the storage position and the storage position, and this movement can be performed manually by the operator. Therefore, the hydraulic cylinder and its necessary equipment can be omitted together with the ball joint, etc., and the structure can be simplified and costs can be reduced.

In the second aspect of the invention, the relative rotation in the fitting joint is performed while the lock pin is guided by the annular guide groove, so that the relative rotation is made smooth.

In the third aspect of the present invention, the fitting joint portion is relatively rotated about an axis extending horizontally in the left-right direction, so that the tilt angle of the side boom can be arbitrarily adjusted in the retracted position. thus,
The tilting angle of the side boom can be changed depending on the storage location of the boom sprayer, and the boom sprayer can be appropriately stored.

In the invention of claim 4, the position of the side boom around the horizontal axis in the left and right direction can be adjusted by inserting the lock pin into the selected pin hole, and the spray angle of the nozzle attached to the side boom can be adjusted. Can be made appropriate.

[Brief explanation of the drawing]

The drawings relate to an embodiment of this invention, and FIGS. 1 and 2 are front and side views showing the side boom support structure, respectively, FIG. 3 is a vertical sectional view of the center boom support structure in the annular guide groove, and FIG. Figure 4 is a perspective view of the cylindrical end, Figure 5 is a view of the condition of the boom sprayer mounted on an agricultural tractor when it is being moved by the agricultural tractor, as seen from the rear of the boom sprayer, Figure 6 is a side view of the boom sprayer with the side boom in the retracted position; Figures 7a and b show different rotational positions of the side boom about the axis of the side boom; Figure 8 is a side view of the boom sprayer with the side boom in the retracted position; FIG. 2 is a schematic perspective view of the installed boom sprayer. 14... Boom sprayer, 24... Side boom, 30... Cylindrical end (support body, inner part),
32... Annular guide groove, 34... Pin hole, 38...
Cylindrical part (outer part), 39... Fitting joint part, 42
... Lock pin, 48 ... Compression coil spring (spring), 53 ... Swinging joint.

Claims (1)

[Claims for Utility Model Registration] (1) A fitting coupling part 39 that can be freely removed in the axial direction and allowing relative rotation around the axis, and a straight line perpendicular to the axis of the fitting coupling part 39. A rocking coupling part 53 that allows relative rocking of the surroundings is connected in series and is interposed between the base end of the side boom 24 and the support body 30, and the lock pin 42 is
A boom sprayer characterized in that the boom sprayer is inserted into and removably into the pin hole 34 of the fitting connection part 39, thereby restraining the fitting connection part 39 from coming off in the axial direction and from relative rotation around the axis. (2) An annular guide groove 32 extending in the circumferential direction is formed on the periphery of the inner portion 30 of the fitting joint part 39, and the lock pin 42 is connected to the fitting joint part 3.
2. The boom according to claim 1, wherein the boom is movably supported on an outer portion 38 of the boom 9, biased toward the annular guide groove 32 by a spring 48, and guided in the annular guide groove 32 at a distal end thereof. sprayer. (3) The fitting coupling part 39 allows relative rotation around an axis extending horizontally in the left-right direction, and connects the support body 30 and the swing coupling part 82. The boom sprayer according to item 1 or 2. (4) The boom sprayer according to any one of claims 1 to 3, wherein a plurality of the pin holes 34 are formed at appropriate intervals in the direction of relative rotation of the fitting joint portion 39.