JPH09187208A - Boom opening and closing apparatus of boom sprayer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive boom opening and closing apparatus with a simple constitution by providing an impact release mechanism adaptable to both of an operator which requires forward scattering and an operator which requires backward scattering. SOLUTION: This boom opening and closing apparatus is equipped with oscillating booms 9 each oscillatably attached to a machine body 2 by a detachable common pivot shaft 10 and each being independently oscillatable, an operating lever 17 and an actuator 11 provided between one end part 17a of the operating layer 17 and the machine body 2 and oscillating and driving the operating lever 17 and an energizing means 23 detachably provided between the operating lever 17 and the oscillating boom 9 and energized so as to oscillate to other end part 17b of the operating lever 17 around the pivot shaft 10 and two stoppers 26 and 27 allowing the oscillating boom 9 to oscillate by a prescribed angle α independently from the operating lever 17 and bringing into contact with the operating lever 17 and controlling independent oscillation beyond the prescribed angle α of the oscillating boom 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boom opening / closing device for a boom sprayer used for wide-spreading agricultural chemicals. Here, the opening and closing of the boom means that the boom is rotated about the boom pivot axis to expand the boom laterally in the traveling direction from the body of the boom sprayer, and the expansion is performed. By rotating the boom in the opposite direction about the boom pivot shaft, the boom is stored in the original state along the airframe.

[0002]

2. Description of the Related Art Boom sprayers have been conventionally known as a device for spraying a spraying agent such as a chemical solution in a wide range. As the boom sprayer, for example, a control device is provided at the rear of a machine equipped with a traveling device capable of traveling in the field, a chemical solution tank and a pump are mounted on the machine, and a boom device is provided at the front of the machine. I have something to prepare.

The boom device is provided with a long swing boom which is horizontally swingably provided on the left and right sides of the machine body. The left and right swing booms are laterally extended toward the traveling direction of the machine body during the spraying work, and stored in the front-rear direction along the machine body during the non-scattering work. The oscillating drive of the oscillating boom is performed by the operation of an electric linear actuator installed between the oscillating boom and the machine body.

A nozzle pipe is inserted through the swing boom, and the inside of the nozzle pipe is communicated with a plurality of downward nozzles provided at equal intervals along the swing boom. The chemical liquid in the chemical liquid tank is supplied to the nozzle pipe by the operation of the pump, and the chemical liquid is sprayed downward from the nozzles.

When performing the spraying work, the electric linear actuator is operated to extend the swing boom to the left and right. Then, the operator can perform a spraying work of agricultural chemicals or the like in a wide range while operating the control device and walking along with the progress of the machine body.

In such a boom sprayer, it is possible to prevent the boom device from being damaged due to the swing boom colliding with an obstacle such as a pile when the swing boom is spread and the spraying work is performed. Therefore, according to the resistance of the obstacle, the swing boom is swung to release the shock, and after the resistance of the obstacle disappears, the swing boom automatically returns to the original stretched state. Is provided.
This shock relief mechanism uses, for example, a tension coil spring, and is a publicly known one disclosed in Japanese Utility Model Publication No. 61-34069 and Japanese Utility Model Publication No. 5-22299.

By the way, in the boom sprayer as described above, when the worker performs the spraying work while standing behind the machine body and advancing the machine body, the worker sucks the spraying agent sprayed from the nozzle. Because of the danger, it is common to move the machine backwards and use it to spray after the passage of an operator. However, some workers may need to perform the spraying work while moving the machine body forward. The impact escape direction of the oscillating boom upon collision with an obstacle inevitably has to be the opposite direction when the vehicle body moves forward and when it moves backward.

Therefore, in order to be suitable for both an operator who needs forward spraying and an operator who needs backward spraying,
It is desirable to adopt an impact relief mechanism that can release the impact in both the front and back directions. However, because the electric linear actuator is used to open and close the swing boom, the shock relief mechanism in both front and rear directions is
Inevitably, the structure becomes complicated and the cost becomes high.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and the problem to be solved is to both the forward spreading worker and the backward spreading worker. It is an object of the present invention to provide a boom opening / closing device that has an adaptable shock relief mechanism and that has a simple structure and is inexpensive.

[0010]

In order to solve the above-mentioned problems, the inventors of the present invention pay attention to the point that a worker of forward spreading always carries out forward spreading, and a worker of backward spreading always carries out backward spreading. However, the boom opening and closing can be selectively established according to the operator's preference, by just changing the connection state of the same set of parts, the forward impact relief mechanism and the rear impact relief mechanism can be established. The device was created.

That is, the boom opening / closing device according to the present invention includes a swinging boom and an operating lever, which are swingably attached to the machine body by a common detachable pivot shaft and can swing independently of each other. An actuator provided between one end of an operation lever and the machine body to drive the operation lever to swing, and a swingable boom that is detachably provided between the operation lever and the swing boom. An urging means for urging the operation lever so as to oscillate toward the other end of the operation lever about the pivot shaft, and the oscillating boom is allowed to oscillate by a predetermined angle independently of the operation lever. In addition, it is provided with two stoppers that come into contact with the operation lever and restrict independent swinging of the swinging boom beyond the predetermined angle.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a boom sprayer equipped with a boom opening / closing device according to an embodiment of the present invention. The boom sprayer shown in the figure is equipped with a control device 3 at the rear of an airframe 2 equipped with a crawler type traveling device 1 that can travel freely in a field, and is equipped with a chemical liquid tank 4 and a pump 5 on the airframe 2, The boom device 7 can be freely adjusted in the vertical position on the front part of the 2 through the parallel linkage device 6.
It has.

The boom device 7 comprises a fixed boom 8 and two swing booms 9 on the left and right. The fixed boom 8
Is set to a length approximately equal to the left-right width of the machine body 2, and the vertical frame portion 6a at the front of the parallel linkage device 6 is
It is fixed horizontally in the left-right direction. On the other hand, the left and right swing booms 9 are pivotally fixed at their base ends to the left and right ends of the fixed boom 8 by detachable pivot shafts 10 extending in the vertical direction. As a result, the swing booms 9 can swing horizontally about the pivot shafts 10. The swinging motion of each swinging boom 9 is drive-controlled by the operation of an electric linear actuator 11 installed between each swinging boom 9 and the fixed boom 8.

The fixed boom 8 and each swinging boom 9
Nozzle pipes (not shown) are inserted therein, and the interiors of these nozzle pipes communicate with a plurality of downwardly facing nozzles 12 provided along the booms 8 and 9 at equal intervals. The chemical liquid in the chemical liquid tank 4 is supplied to each of the nozzle pipes by the operation of the pump 5, and the chemical liquid is sprayed downward from the nozzles 12.

When performing the spraying work, the actuator 11 is actuated to swing the swing boom 9 and spread it to the left and right. And the worker
By operating the control device 3 and walking along with the progress of the machine body 2, it is possible to widely spray pesticides and the like.

2 and 3 are plan views of a boom opening / closing device according to an embodiment of the present invention, showing a right side boom opening / closing device when performing a spraying work while moving the machine body 2 backward. FIG. 2 shows that the swing boom 9 is attached to the body 2
FIG. 3 shows a spraying work state in which the swinging boom 9 is stretched laterally with respect to the traveling direction of the swinging boom 9 that has been stretched.
Is folded and stored along the machine body 2 for movement and storage. The boom opening / closing device on the left side (not shown) is arranged symmetrically with the boom opening / closing device on the right side.

As described above, the base ends of the swinging boom 9 are attached to the left and right ends of the fixed boom 8 by the detachable pivot shafts 10. More specifically, the oscillating boom 9 has a U-shaped oscillating boom bracket 13 fixed to the base end side thereof and opening toward the end side of the fixed boom 8. The swing boom bracket 13 includes horizontal portions 14 which are vertically parallel to each other and which are located above and below an end portion of the fixed boom 8, and vertical portions which connect corresponding sides of the horizontal portions 14 to each other. 15, the base end of the boom body 16 of the swing boom 9 is fixed to the vertical portion 15.
The pivot shaft 10 vertically penetrates both the upper and lower horizontal portions 14 of the swing boom bracket 13 and the end portion of the fixed boom 8 housed in the horizontal portion 14. Therefore, the swing boom 9 is swingable in the horizontal direction around the pivot shaft 10.

The pivot stop shaft 10 pivotally supports, together with the swing boom 9, an operating lever 17 for swinging the swing boom 9. The operation lever 17 is an elongated rectangular plate body made of an appropriate steel plate material, and is arranged between the horizontal portion 14 of the swing boom bracket 13 and the end portion of the fixed boom 8, and its longitudinal direction. The pivot shaft 10 is inserted at a position closer to the one end 17a side than the central part.

The swing boom 9 and the operating lever 17 are independently swingable about the common pivot shaft 10. Further, when the pivotal stop shaft 10 is pulled out, the swing boom 9 and the operation lever 17 can be easily removed from the fixed boom 8.

The actuator 11 is provided between the one end 17a of the operating lever 17 and the fixed boom 8.
Is laid horizontally. Specifically, the actuator mounting bracket 18 that extends horizontally to the front of the machine body 2
Projecting from the fixed boom 8, the base end portion of the cylinder portion 19 of the actuator 11 is pivotally fixed to the electric cylinder mounting bracket 18 by a pin 20 extending in the vertical direction, and the one end of the operation lever 17 is provided. In part 17a,
The tip end of the telescopic rod 21 of the actuator 11 is pivotally fixed by a pin 22 extending in the vertical direction. Therefore,
The actuator 11 acts as an actuator that drives and controls the swing motion of the swing boom 9 via the operation lever 17.

A hydraulic actuator may be used in place of the electric actuator 11.

Between the operating lever 17 and the swinging boom 9, the swinging lever 9 is attached so as to swing toward the other end 17b of the operating lever 17 about the pivot shaft 10. An urging means for urging is detachably provided.
As the biasing means, in the illustrated example, the tension coil spring 2 is used.
3 is used.

That is, the tension coil spring 23 has one end 23a at the other end 17 of the operating lever 17.
b is detachably locked to the other end 23b.
Is removably locked to the swing boom 9 and is stretched between them in a predetermined tension state. The boom body 16 of the swing boom 9 has the other end portion 23 of the tension coil spring 23 at predetermined intervals along the length direction thereof.
The outer first and second inner spring hooks 24 and 25 for locking b are fixed.

A plurality of locking positions of the one end portion 23a of the tension coil spring 23 to the other end portion 17b of the operating lever 17 are set so as to correspond to the tension change of the tension coil spring 23. It is suitable.

On the other hand, the oscillating boom 9 is allowed to oscillate by a predetermined angle α in a horizontal plane independently of the operating lever 17, and the oscillating boom 9 contacts the operating lever 17. Two stoppers are provided that are in contact with each other and restrict the independent swing of the swing boom 9 beyond the predetermined angle α. In the illustrated example, the vertical edge portion 26 of the vertical portion 15 of the swing boom bracket 13 acts as one of the stoppers, and the vertical edge portion between the parallel upper and lower horizontal portions 14 of the swing boom bracket 13 is vertical. The stopper pin 27 fixed to the above acts as the other stopper.

The boom opening / closing device constructed as described above is used as follows.

First, in the case of most workers who spray medicines or the like while moving the machine body 2 backward, as shown in FIG. 1 to FIG.
7a is arranged so as to be located on the front side of the machine body 2 with respect to the pivot shaft 10, and is pivotally fixed to the end of the fixed boom 8 by the pivot shaft 10 together with the swing boom 9. The other end 17b of the operating lever 17 and the outer first spring hook 24 provided on the swing boom 9 are provided.
And the tension coil spring 23 is stretched over in a predetermined tension state. As a result, the swinging boom 9 has the other end portion 1 of the operation lever 17 with the pivot shaft 10 as the center.
The vertical edge portion 26 on the rear side of the vertical portion 15 of the swing boom bracket 13 is constantly urged so as to swing toward the 7b side, and further forward swing by contacting the front side edge of the operation lever 17. Is regulated.

In the above structure, when the telescopic rod 21 of the actuator 11 is retracted from the extended state, the operation lever 17 rotates counterclockwise as viewed in FIG. 2 or FIG. Then, the operation lever 1
The front edge of 7 pushes the vertical edge portion 26 on the rear side of the vertical portion 15 of the swing boom bracket 13 to swing the swing boom 9 in the extending direction.

When the swing boom 9 swings and extends to the side of the machine body 2 (in a straight line with the fixed boom 8), the retracting operation of the telescopic rod 21 of the actuator 11 is stopped. . And the aircraft 2
While moving backward, the wide-spreading work is performed by the left and right swing booms 9 and the fixed boom 8 which are spread laterally (see FIG. 2).

Here, it is assumed that the extended swing boom 9 collides with an obstacle. In this case, as shown by the phantom line in FIG. 2, the swing boom 9 swings forward by the predetermined angle α against the biasing force of the tension coil spring 23 and escapes. You can Therefore, the operator should set the stopper pin 27 to the operation lever 17
If the backward movement of the machine body 2 is stopped before it comes into contact with, it is possible to prevent the rocking boom 9 from being damaged.

Since the backward speed of the machine body 2 is set to a low speed according to the walking speed of the worker, the swing boom 9 collides with an obstacle and swings to a predetermined angle α, and It is not so difficult for the operator to stop the backward movement of the machine body 2 before the stopper pin 27 contacts the operation lever 17.

When the resistance is eliminated by avoiding the obstacle, the swinging boom 9 is automatically returned to the normal extended state by the action of the tension coil spring 23.

Next, when the spraying work is completed and the swing boom 9 is folded along the machine body 2, the actuator 11 is extended so as to extend the telescopic rod 21.
Is activated. Then, the operation lever 17 swings clockwise as viewed in FIG. 2 or FIG. 3, and the boom body 16 of the swing boom 9 and the tension coil spring 23 move integrally as a result of the connection, thereby swinging the swing body. The boom 9 swings and is folded (see FIG. 3).

On the other hand, in the case of an operator who sprays medicines and the like while advancing the machine body 2, as shown in FIGS. 4 and 5, the operation lever 17 is provided with one end portion 17a of which is the pivot shaft. It is arranged by being inverted by 180 degrees so as to be located on the rear side of the machine body 2 with respect to 10, and is pivotally fixed to the end of the fixed boom 8 by the pivot stop shaft 10 together with the swing boom 9. Then, the other end portion 1 of the operation lever 17
The tension coil spring 23 is stretched between the 7b and the inward second spring hook 25 provided on the swing boom 9 in a predetermined tension state. As a result, the swing boom 9
Is always urged to swing toward the other end 17b of the operating lever 17 about the pivot shaft 10, and the stopper pin 27 abuts on the front side edge of the operating lever 17 so that The above swing is restricted.

In the above structure, when the telescopic rod 21 of the actuator 11 is extended from the retracted state, the operating lever 17 rotates counterclockwise as viewed in FIG. 4 or 5. Then, the operation lever 1
7, the tension coil spring 23 and the boom main body 16 move integrally for connection, and the swing boom 9 swings in the extension direction.

When the oscillating boom 9 oscillates and is extended to the side of the machine body 2, the actuator 1
The extension operation of the telescopic rod 21 of No. 1 is stopped. Then, while advancing the machine body 2, a wide-spreading work is performed by the left and right swing booms 9 and the fixed boom 8 which are spread laterally.

Here, it is assumed that the extended swing boom 9 collides with an obstacle. In this case, the swinging boom 9 can swing backward by the predetermined angle α against the biasing force of the tension coil spring 23 and escape. Therefore, if the operator stops the forward movement of the machine body 2 before the vertical edge portion 26 of the vertical portion 15 of the swing boom bracket 13 comes into contact with the operation lever 17, the swing boom 9 will be damaged. Can be prevented. Since the forward speed of the machine body 2 is set to a low speed according to the walking speed of the worker, the swing boom 9 collides with an obstacle and swings to a predetermined angle α to swing the swing boom bracket 13. It is not so difficult for the operator to stop the forward movement of the machine body 2 before the vertical edge portion 26 on the rear side of the vertical portion 15 comes into contact with the operation lever 17.

According to the present embodiment constructed and operated as described above, it is only necessary to remove the pivotal shaft 10 and change the direction of the operation lever 17 to change the attachment state of the tension coil spring 23. It is possible to selectively establish the shock release mechanism for forward spreading and the shock release mechanism for backward spreading. Therefore, it is possible to obtain a boom opening / closing device having a simple structure and a low cost, which is provided with an impact relief mechanism that can be applied to both forward spreading workers and backward spreading workers.

[Brief description of the drawings]

FIG. 1 is an overall schematic perspective view showing an example of a boom sprayer provided with a boom opening / closing device according to an embodiment of the present invention.

FIG. 2 is a plan view showing a state where the boom opening / closing device according to the embodiment of the present invention is assembled to be suitable for backward spreading and the swing boom is extended.

FIG. 3 is a plan view showing a state where the boom opening / closing device according to the embodiment of the present invention is assembled to be suitable for backward spreading and the swing boom is folded.

FIG. 4 is a plan view showing a state in which the boom opening / closing device according to the embodiment of the present invention is assembled to be suitable for forward spreading and the swing boom is extended.

FIG. 5 is a plan view showing a state where the boom opening / closing device according to the embodiment of the present invention is assembled to be suitable for forward spreading and the swing boom is folded.

[Explanation of symbols]

 2 Airframe 9 Swing boom 10 Pivot shaft 11 Actuator 17 Operating lever 17a One end of operating lever 17b Other end of operating lever 23 Biasing means 26, 27 Stopper α Predetermined angle

Claims (1)

[Claims] 1. A swinging boom (9) and an operating lever (17) which are swingably mounted on a body (2) by a common detachable common pivot shaft (10) and can swing independently. And one end of the operating lever (17) (17
an actuator (11) which is provided between a) and the machine body (2) and swingably drives the operation lever (17);
The swing boom (9) is detachably provided between the operation lever (17) and the swing boom (9), and the swing boom (9) is attached to the other side of the operation lever (17) about the pivot stop (10). A biasing means (23) for biasing the end portion (17b) to swing and the swing boom (9) swings by a predetermined angle (α) independently of the operation lever (17). And two stoppers (26, 27) for allowing independent operation and for restricting independent swing of the swing boom (9) beyond the predetermined angle (α) by contacting the operation lever (17).
A boom opening / closing device for a boom sprayer, comprising: