JPH0541803Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a boom support device for a boom sprayer, and more specifically, the invention relates to a boom support device for a boom sprayer. This invention relates to a boom support device whose relative position with respect to the boom is regulated.

[Conventional technology]

In a boom sprayer, in order to be able to adjust the spraying width to an appropriate value depending on the situation, a movable boom is supported by a support boom so as to be movable in the longitudinal direction, thereby making the boom device telescopic. (Example: Japanese Patent Publication No. 58-41904, Japanese Patent Publication No. 58-41905, and Publication Utility Model Publication No. 63-44132).

4 and 5 are structural diagrams of conventional boom devices, respectively. In FIGS. 4 and 5, components corresponding to those in FIGS. 1 to 3 regarding the embodiment of this invention are indicated by the same reference numerals, detailed explanations are omitted, and the main points will be described.

In FIG. 4, the supporting boom 12 and the moving boom 1
4 extends horizontally in the left-right direction of a boom sprayer (not shown), and the movable boom 14 is supported so as to be movable relative to the support boom 12 in the longitudinal direction. The plurality of nozzles 28 are arranged with equal pitches L1 in the longitudinal direction of the support boom 12 and the movable boom 14, with their nozzles facing downward, and the chemical liquid is fed under pressure from a spray pump (not shown). Each nozzle 28 attached to the mobile boom 14 is equipped with an opening/closing valve (not shown), and the opening/closing operation part 30 is swingable around the upper end, and the lower end is connected to the longitudinal direction of the mobile boom 14. direction to switch the opening and closing of the on-off valve. The contact body 32 is provided to protrude from the tip of the support boom 12 and comes into contact with the lower end of the opening/closing operation section 30 to displace the opening/closing operation section 30 when the movable boom 14 is moved in and out of the support boom 12. It's getting old. Therefore, while the chemical solution is being sprayed, all the nozzles 28 attached to the support boom 12 are in a spraying state, but among the nozzles 28 attached to the movable boom 14, the proximal end is closer to the abutting body 32. The nozzles 28 on the sides stop spraying, and only the nozzles 28 on the tip side from the contact body 32 are spraying the chemical solution. Both Lx and L2 are distances in the longitudinal direction of the support boom 12, and Lx
is the distance between the most distal nozzle 28 of the support boom 12 and the abutting body 32, and L2 is the distance between the proximal nozzle 28 of the movable boom 14 and the support boom 1.
The distances from the most advanced nozzle 28 at No. 2 are shown respectively.

In the boom device shown in FIG. 5, the opening/closing operation section 30 is
It is provided in each nozzle 28 on the support boom 12 side and is swingable around the lower end. The contact body 32 is provided protrudingly from the lower surface of the proximal end of the movable boom 14, and opens and closes the on-off valve of the nozzle 28 on the support boom 12 side by contacting the upper end of the opening/closing operation part 30 on the support boom 12 side. do. Therefore, during the spraying of the chemical solution, the nozzle 2 attached to the movable boom 14
All of the nozzles 8 are in the spraying state, but among the nozzles 28 attached to the support boom 12, the nozzles 28 on the distal side of the abutting body 32 stop spraying, and the nozzles 28 on the proximal side of the abutting body 32 stop spraying. Only the nozzle 28 is spraying the chemical solution. Both Lx and L2 are distances in the longitudinal direction of the support boom 12, and Lx is the distance between the proximal nozzle 28 of the movable boom 14 and the contact body 32.
The distance L2 indicates the distance between the most proximal nozzle 28 on the moving boom 14 and the most distal spraying nozzle 28 on the support boom 12, respectively.

In the conventional boom devices shown in FIGS. 4 and 5, the side where the opening/closing operation section 30 is provided is the movable boom 1.
Although the nozzles 28 on the 4 side and the support boom 12 side are different, the support boom 12 and the movable boom 14
The relative position with respect to this is arbitrary, and no special positioning has been made regarding the relative position.

[The problem that the idea aims to solve]

Therefore, as shown in FIGS. 4 and 5, when Lx is approximately 0, L2 may be an extremely smaller value than L1, and in such a case,
In the L2 range, the amount of chemical liquid sprayed increases compared to the others,
Crops may be sprayed with more than the prescribed amount of chemical solution, causing chemical damage. On the other hand, if Lx is approximately L1,
L2 may increase to approximately 2·L1, and in this case, the spray density of the chemical solution in the range of L2 decreases.

Note that the manual operation section of the drive device is located near the driver's seat of the tractor with the boom sprayer attached to the rear, so it is difficult for the operator to see the distance between the nozzles 28, making it difficult for the worker to operate the drive device manually. Therefore, it is difficult to take L2=L1.

The object of the invention of claims 1 and 2 is to prevent excessive or insufficient amount of chemical solution from occurring at the ends of the longitudinal overlap portion of the support boom and the movable boom in a boom device for a boom sprayer whose length is freely adjustable. It is to be.

The purpose of the invention of claim hole 3 is to provide an advantageous embodiment of the release means in the invention of claim 2.

[Means to solve the problem]

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

Boom device 10 of a boom sprayer according to claim 1
Here, the movable boom 14 is supported movably in the longitudinal direction by the support boom 12 so that the amount of protrusion from the support boom 12 can be changed by driving the drive device 60. Further, a plurality of nozzles 28 are arranged on the support boom 12 and the movable boom 14 at equal pitches L1, and the nozzles 28 at the longitudinally overlapping parts of the support boom 12 and the movable boom 14 are arranged on the support boom 12 and the movable boom 14.
and the nozzle 28 belonging to one of the mobile booms 14 is stopped from spraying. The boom device 10 of such a boom sprayer is driven at a position where the distance L2 between the most proximal spraying nozzle 28 on the movable boom 14 and the most advanced spraying nozzle 28 on the support boom 12 is the pitch L1. A release means 34 is provided for stopping the drive of the device 60.

Boom device 10 of a boom sprayer according to claim 2
has the following components (a) to (h).

(a) A movable boom 14 supported on the support boom 12 so as to be freely movable in the longitudinal direction so that the amount of projection from the support boom 12 can be changed. (b) A drive unit 60 for moving the movable boom 14 relative to the support boom 12. (c) A plurality of nozzles 28 attached to the support boom 12 and the movable boom 14 at equal pitches L1. (d) An opening/closing operation unit 30 provided on each nozzle 28 arranged on one side of the support boom 12 and the movable boom 14 for switching on and off spraying of chemical solution from the nozzles 28 by displacement. (e) An abutment body 32 fixed to the other side of the support boom 12 and the movable boom 14, which abuts against the opening/closing operation unit 30 as the support boom 12 and the movable boom 14 move relative to each other, thereby displacing the opening/closing operation unit 30. (f) An extension/retraction instruction means 35 operated by an operator when driving the drive unit 60. (g) Drive holding means 42, 4 for holding the drive of the drive unit 60 even after the operation of the extension/retraction instruction means 35 is released.
8 (h) Spraying nozzle 28 at the most distal end of support boom 12
and the spray nozzle 28 at the base end of the moving boom 14.
A release means 34 for releasing the drive holding means 42, 48 and stopping the drive device 60 when the distance L2 between the drive holding means 42, 48 and the drive device 60 becomes equal to the pitch L1.
In the present embodiment, the release means 34 is a limit switch 34 which is operated by contact with the nozzle 28.

[Effect]

In the invention of claim 1, the movable boom 14 is moved relative to the support boom 12 by driving the drive device 60. The nozzle 28 belonging to one of the support boom 12 and the movable boom 14 is connected to the support boom 1
Although spraying is stopped at the nozzles 28 at the longitudinally overlapping portion of the mobile boom 14 and the movable boom 14, spraying is carried out outside of this longitudinally overlapping portion. The release means 34 connects the spraying nozzles 2 at the proximal and most distal ends of the movable boom 14 and the support boom 12, respectively.
8 is detected, and when this distance L2 becomes equal to the pitch L1 of the nozzles 28 of the support boom 12 and the movable boom 14, the operation of the drive device 60 is stopped, and the movement of the movable boom 14 with respect to the support boom 12 is stopped. .

In the second aspect of the present invention, the drive device 60 is brought into the driving state by the operation of the extension/contraction instruction means 35, and the drive holding means 42, 48 maintain the drive device 60 in the drive state even after the operation of the extension/contraction instruction means 35 is released. Thus, the moving boom 14 moves relative to the support boom 12. Support boom 12 and moving boom 1
The opening/closing operation part 30 of the nozzle 28 arranged on one side of the nozzle 4 contacts the abutting body 32 when passing the abutting body 32 fixed to the other of the support boom 12 and the movable boom 14. , are displaced to open and close the chemical passage to the nozzle 28. Thereby, the nozzle 28 belonging to one of the support boom 12 and the movable boom 14 is connected to the support boom 12 and the movable boom 1.
Spraying is stopped on the inside of the longitudinal overlap portion of No. 4, but spraying is carried out on the outside of this longitudinal overlap portion. When the distance L2 of the most proximal and most distal spraying nozzles 28 on the movable boom 14 and the support boom 12, respectively, becomes approximately equal to the pitch L1 of the nozzles 28 on the support boom 12 and the movable boom 14, the release means 34 is detected, and the drive holding means 42, 48 are released. As a result, the operation of the drive device 60 is stopped and the movement of the moving boom 14 relative to the support boom 12 is stopped.

In the invention of claim 3, the distance L2 between the most proximal and most distal spraying nozzles 28 in the movable boom 14 and the support boom 12, respectively, becomes a distance approximately equal to the pitch L1 of the nozzles 28 of the support boom 12 and the movable boom 14. , limit switch 34
is operated by contact with the nozzle 28 to release the drive holding means 42, 48.

〔Example〕

This invention will be explained below with reference to the embodiments shown in FIGS. 1 to 3.

FIG. 1 is an overall view of a boom device 10 in a boom sprayer. The boom device 10 has a support boom 12 on the proximal side and a movable boom 14 on the distal side, and extends horizontally in the left-right direction of the boom sprayer. A pair of base-side guide rollers 16 are attached above and below the base end of the movable boom 14, and roll on the lower surface of the upper wall and the upper surface of the lower wall of the support boom 12, respectively. Further, a pair of tip-side guide rollers 18 are attached above and below the tip of the support boom 12, and roll on the upper and lower surfaces of the movable boom 14, respectively. Due to the rolling of the base guide roller 16 and the tip guide roller 18, the movable boom 14 is supported by the support boom 12 so as to be movable in the longitudinal direction. The drum 20 is disposed on the base end side of the support boom 12,
It can be rotated in both directions by a hydraulic motor 60, which will be described later. The pulley 22 is rotatably supported at the tip of the support boom 12. The wire 24 is hung over the drum 20 and the pulley 22, and is secured to the proximal end of the moving boom 14 by nuts 26 at both ends. The rotation of the drum 20 causes the wire 24 to rotate around the drum 20 and the pulley 22.
The proximal end of the movable boom 14, which serves as the fixing point for the boom device 4, is displaced in the longitudinal direction of the support boom 12, thereby changing the amount of protrusion of the movable boom 14 from the support boom 12, and increasing the length of the boom device 10. Be changed. The plurality of nozzles 28 are arranged with equal pitches L1 in the longitudinal direction of the support boom 12 and the movable boom 14, with their nozzles facing downward, and the chemical liquid is fed under pressure from a spray pump (not shown). The nozzle 28 attached to the movable boom 14 has a built-in on-off valve (not shown), and the on-off operation section 30 swings around the upper end to open and close the on-off valve. The chevron-shaped contact body 32 is fixed to the lower wall of the tip of the support boom 12 and is adapted to come into contact with the opening/closing operation section 30 when the movable boom 14 moves. The limit switch 34 as a release means is
It is attached to the support boom 12 adjacent to the base end side of the contact body 32 in the extending direction of the support boom 12 . The position of the abutting body 32 in the longitudinal direction of the support boom 12 is the same as the most distal nozzle 28 of the support boom 12 .

FIG. 2 is an electrical circuit diagram of the movement amount control section of the mobile boom 14. The telescopic instruction switch 35 is arranged at a position that can be operated from the driver's seat, is turned on only when operated, and automatically returns to off when the operating force is released. Connecting. The relay 42 has a coil 44
and a contact 46 that is turned on when the coil 44 is energized, and the coil 44 and the contact 46 are connected in parallel to the switching coil 36 and the expansion/contraction instruction switch 35, respectively. The relay 48 is connected to the coil 5
0 and a contact 52 that turns on when the coil 50 is energized.
The coil 50 and the contact 52 are connected in parallel to the switching coil 38 and the expansion/contraction instruction switch 35, respectively. limit switch 34
are connected in series to the coils 44 and 50 of the relays 42 and 48. The expansion/contraction instruction switch 35 switches the battery 40 to the switching coil 36 or 38.
When connected to , the switching coil 36 or 38 becomes energized, and the coil 44 or the coil 50 becomes energized.
The contact 46 or the contact 52 is turned on by the energization, and the switching coil 36 or 38 remains energized even after the telescopic instruction switch 35 is released. Then, when the limit switch 34 is turned off, the energization to the coil 44 or 50 is forcibly cut off, so the contact 46 or 52 is turned off, and the energization of the switching coil 36 or 38 is stopped.

FIG. 3 is a hydraulic circuit diagram of the movement amount control section of the mobile boom 14. Hydraulic pump 54 generates oil pressure;
The relief valve 56 prevents the pressure on the discharge side of the hydraulic pump 54 from exceeding a predetermined value. Solenoid switching valve 58
is switched by energizing the switching coils 36 and 38, and in the neutral position, the supply of hydraulic pressure to both ports of the hydraulic motor 60 is stopped, and when the switching coil 36 or 38 is energized, the hydraulic pressure from the hydraulic pump 54 is stopped. direction or the other direction to both ports of the hydraulic motor 60. The hydraulic motor 60 is connected to the drum 20 mentioned above. Therefore, when the switching coil 36 is energized, the hydraulic motor 60 rotates in the normal direction and the movable boom 14 protrudes from the support boom 12, and when the switching coil 38 is energized, the hydraulic motor 60 rotates in the reverse direction. , the moving boom 14 is retracted into the support boom 12.

The operation of the embodiment will be explained. Boom device 1
Since the effects when expanding and reducing 0 are the same, only the case where 0 is expanded will be explained.

During the spraying of a chemical solution, all the nozzles 28 attached to the support boom 12 are spraying, but the nozzles 28 attached to the movable boom 14
8, the nozzle 28 located on the tip side from the contact body 32
Only the nozzle 28 is spraying, and the nozzle 28 on the proximal side of the contact body 32 has stopped spraying.

The worker is in the driver's seat and presses the telescopic instruction switch 3.
5 and turn on the battery 40 to switch coil 3.
Connect to 6. As a result, the switching coil 36
and the coil 44 of the relay 42 becomes energized,
The contact 46 is turned on, and current is supplied from the battery 40 to the switching coil 36 and the coil 44 via the contact 46. Thereby, even after the operator releases the telescopic instruction switch 35 and the telescopic instruction switch 35 is turned off, the energization of the switching coil 36 is maintained. The electromagnetic switching valve 58 sends hydraulic pressure in a predetermined direction to the hydraulic motor 60 by energizing the switching coil 36, the hydraulic motor 60 rotates in the normal direction, the drum 20 rotates, and the movable boom 14 transfers to the supporting boom 12.
It sticks out from. When the movable boom 14 starts protruding, the most proximal spraying nozzle 28 of the movable boom 14 is located adjacent to the abutting body 32 and closer to the tip of the movable boom 14 than the abutting body 32 . The amount of protrusion of the movable boom 14 from the support boom 12 gradually increases, and the next nozzle 2 on the movable boom 14
8 comes to the limit switch 34, the nozzle 28
comes into contact with the limit switch 34, turning the limit switch 34 off. This causes relay 4
The current to the second coil 44 is cut off, the switching coil 36 is de-energized, the electromagnetic switching valve 58 is placed in the neutral position, and the rotation of the hydraulic pump 54 is stopped. The limit switch 34 is turned off when it comes into contact with the nozzle 28, and the nozzle 28 of the movable boom 14 that operates the limit switch 34 stops just before it gets over the abutting body 32. Thus, the distance L2 between the most proximal and most distal spraying nozzles 28 on the mobile boom 14 and the support boom 12, respectively, is approximately equal to the pitch of the nozzles 28 on the support boom 12 and the mobile boom 14, L1, with respect to the longitudinal direction of the boom device 10. become.

In the illustrated embodiment, a limit switch 3 is operated against the nozzle 28 to define the relative position of the mobile boom 14 with respect to the support boom 12.
4 is used, but drum 20 and hydraulic pump 5 are used.
It is also possible to control the drive stop of the hydraulic pump 54 by detecting the amount of rotation of the hydraulic pump 54, etc.

Further, in the illustrated embodiment, an opening/closing operation unit 30 is provided in the nozzle 28 on the movable boom 14 side, and the spray from the nozzle 28 on the movable boom 14 side is transferred to the boom device 10.
Although the spraying from the nozzle 28 on the support boom 12 side may be controlled depending on the length of the boom device 10, as shown in FIG. . In that case, open/close operation section 3
0 is provided on the nozzle 28 on the support boom 12 side, and the contact body 32 is fixedly installed on the movable boom 14. Further, although the limit switch 34 is attached to the one of the support boom 12 and the movable boom 14 to which the abutting body 32 is attached, it can also be attached to the one to which the abutting body 32 is not attached.

[Effect of idea]

In the invention of claim 1, the stop position of the movable boom with respect to the support boom is such that the distance between the most proximal spraying nozzle on the movable boom and the most advanced spraying nozzle on the support boom is equal to the pitch of the nozzles of the support boom and the movable boom. is defined by the release means so that the spacing of the nozzles during spraying is equal over the entire length of the boom device;
It is possible to prevent the spray amount of the chemical liquid near the ends of the longitudinal overlapping portions of the support boom and the moving boom from becoming too large or too small compared to other parts.

In the invention of claim 2, after the operator releases the telescopic instruction means, the drive holding means continues to operate the drive device, and the most proximal spraying nozzle on the movable boom and the most advanced spraying nozzle on the support boom When the distance from the nozzles becomes equal to the pitch of the nozzles of the support boom and the moving boom, the release means detects this and stops the operation of the drive device, so that the spacing between the nozzles during spraying is maintained over the entire length of the boom device. Therefore, it is possible to prevent the amount of the chemical liquid being sprayed near the ends of the longitudinal overlapping portions of the support boom and the moving boom from becoming too large or too small compared to the other areas.

In the invention of claim 3, the limit switch is attached to the support boom or the movable boom, and the distance between the most proximal spray nozzle on the movable boom and the most distal spray nozzle on the support boom is reduced by contact with the nozzle. Since the pitch of the nozzles of the support boom and the moving boom is detected, the detection structure is simple and an inexpensive release means can be used.

[Brief explanation of the drawing]

Figures 1 to 3 relate to an embodiment of this invention, with Figure 1 being an overall view of the boom device in a boom sprayer, Figure 2 being an electrical circuit diagram of the movement amount control section of the mobile boom, and Figure 3 being the mobile boom. 4 and 5 are structural diagrams of a conventional boom device, respectively. 10...Boom device, 12...Support boom, 1
4...Moving boom, 28...Nozzle, 30...Opening/closing operation unit, 32...Abutting body, 34...Limit switch (release means), 35...Extension/contraction instruction switch (extension/contraction instruction means), 42, 48... ...Relay (drive holding means), 60...Hydraulic motor (drive device).

Claims (1)

[Claims for Utility Model Registration] (1) The movable boom 14 is supported movably in the longitudinal direction by the support boom 12 so that the amount of protrusion from the support boom 12 can be changed by driving the drive device 60; A plurality of nozzles 28 are arranged on the support boom 12 and the movable boom 14 at equal pitches L1, and the nozzles 28 are arranged at the longitudinal overlap portion of the support boom 12 and the movable boom 14.
Then, the support boom 12 and the movable boom 1
In the boom device 10 of a boom sprayer in which the nozzles 28 belonging to one of the four groups stop spraying, the distance between the proximalmost spraying nozzle 28 on the movable boom 14 and the most advanced spraying nozzle 28 on the support boom 12. A boom support device for a boom sprayer, characterized in that a release means 34 is provided for stopping the drive of the drive device 60 at a position where L2 becomes the pitch L1. (2) A movable boom 14 that is movably supported by the support boom 12 in the longitudinal direction so that the amount of protrusion from the support boom 12 changes, and a drive that moves the movable boom 14 relative to the support boom 12. a device 60, a plurality of nozzles 28 mounted on the support boom 12 and the movable boom 14 at equal pitch L1, and a plurality of nozzles 28 arranged on one of the support boom 12 and the movable boom 14; The nozzle 2
an opening/closing operation unit 30 that switches execution and stopping of spraying of the chemical solution from 8 through displacement; A contact body 32 that comes into contact with the opening/closing operation section 30 and displacing the opening/closing operation section 30.
, an extension/contraction instructing means 35 operated by the operator when driving the drive device 60 , and an extension/contraction instruction means 35 which is operated by the operator when driving the drive device 60 , and the drive device 60 even after the operation of the extension/contraction instruction device 35 is released.
drive holding means 42, 48 for holding the drive of;
The most advanced atomizing nozzle 2 of the support boom 12
and a release means 34 that releases the drive holding means 42, 48 and stops the drive device 60 when the distance L2 between the spraying nozzle 28 at the proximal end of the movable boom 14 reaches the pitch L1. A boom support device for a boom sprayer, characterized in that: (3) The boom support device for a boom sprayer according to claim 1, wherein the release means 34 is a limit switch 34 operated by contact with the nozzle 28.