JP3497097B2 - Boom device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boom device used for a boom sprayer or the like, and more particularly to a boom device having a boom receiver that supports the boom during storage.

[0002]

2. Description of the Related Art A self-propelled boom sprayer for spraying pesticides has a center boom horizontally arranged in the front part of a freely movable vehicle body and a base end supported on both left and right ends of the center boom. Some have side booms. In such a boom sprayer, when used, the center boom and the side boom are aligned in a straight line, and the chemical liquid is sprayed from nozzles arranged at appropriate intervals on the nozzle pipes arranged in parallel with the center boom and the side boom while traveling in the field. But
At the time of storage, the side boom is rotated with respect to the center boom to tilt the tip of the side boom upward, and the side boom can be stored in a space-saving state with the front-back direction of the vehicle body. If the side boom is rotatable in the up / down direction at this retracted position, it is necessary to maintain the position, and even if the side boom position is maintained due to the interposition of a telescopic cylinder between the center boom and the side boom, etc. Since it is necessary to reduce the load on the fulcrum of the boom base end and the support portion of the telescopic cylinder, the vehicle body is equipped with a boom receiver that receives the middle portion or the tip portion of the side boom from below.

When the boom sprayer travels on an uneven road surface, the side boom may bounce on the boom receiver due to vibration. At this time, there is a risk that the side boom may fall off the boom receiver, the side boom may collide with the boom receiver and be damaged, or the impact may damage the fulcrum of the side boom base end or the support part of the telescopic cylinder. A rubber plate is provided on the boom receiving part of the boom receiving device, and a locking means for fixing the side boom to the boom receiving device during storage is provided.

[0004]

It is possible to prevent damage to the side boom base end portion and the telescopic cylinder support portion only by preventing the side boom from being scratched by only providing the boom receiving member with the rubber plate. Instead, when the side boom is fixed to the boom receiver by the locking means, it is necessary to open / close the lock when switching between use and storage of the boom sprayer, resulting in poor workability.

It is an object of the present invention to provide a boom device that overcomes the above mentioned problems.

[0006]

A boom device (2) of the present invention is pivotally supported by a boom mounting member (40) attached to a machine body (50) at least vertically in a rotatable manner. The boom (36), the arm (18) rotatably supported by the airframe (50) in the vertical direction, and the arm (1).
8) a boom receiver (32) integrally formed with the boom (36) for receiving and supporting an intermediate portion or a tip portion of the boom (36) from below, and a spring (22) for urging the rotation of the arm (18) upward.
And a restricting means (64) for restricting the upward rotation of the arm (18).

The boom (3) by the boom mounting member (40)
The support 6) is a free end support that allows the boom (36) to rotate in the vertical direction, and a downward moment is generated at the pivot point of the base end of the boom (36) due to the weight of the boom (36). However, since the boom (36) is supported by the boom receiver (32) at the middle portion or the tip end, the boom (3) is
6) The rotation position in the vertical direction is maintained. Aircraft (50)
When vibration is applied to the boom (36), the boom (36) swings around the pivotal fulcrum of the boom (36) base end portion by the boom mounting member (40) as a fulcrum and tries to bounce on the boom receiver (32). The downward swing of the boom (36) also pushes the boom receiver (32) downward, causing the arm (18) to rotate downward relative to the machine body (50). Arm (1
Since 8) is biased upward by the spring (22), the downward swing of the boom (36) is buffered. Even when the boom (36) starts to swing upward, the boom receiver (32) keeps following the boom (36) by the bias of the spring (22). The restraining means (64) prevents the arm (18) from pivoting too much upward due to the bias of the spring (22) to a position where the boom receiver (32) cannot receive the boom (36). There is. Thus, the buffering action of the spring (22) damps the swing of the boom (36) and prevents the boom (36) from bouncing on the boom receiver (32) and being dropped or damaged by a collision.

The boom device (2) of the present invention further comprises
Holding means (76, 78, 80) for holding the rotating position of the boom (36) with respect to the boom mounting member (40).

For the boom mounting member (40), the boom (3
6) is also held in the vertical rotation by the holding means (76, 78, 80), but a downward moment is generated at the pivot point of the base end of the boom (36) due to the weight of the boom (36). By supporting the middle portion or the tip portion of the boom (36) by the boom receiver (32), the load on the holding means (76, 78, 80) and the pivotal fulcrum of the boom (36) proximal end is reduced. It Even when the boom (36) tries to bounce on the boom receiver (32) due to vibration applied to the airframe (50), the shock absorbing action of the spring (22) damps the swing of the boom (36) and the boom receiver (32) Ingredients (32)
Since the middle portion or the tip portion of the boom (36) is reliably supported by following the movement of the holding means (76, 78, 80).
Also, damage to the pivot of the boom (36) proximal end is prevented.

According to the boom device (2) of the present invention, the boom mounting member (40) is movable in the vertical direction with respect to the machine body (50) by the drive means (48).

The boom mounting member (40) is attached to the drive means (4).
Since it is movable in the vertical direction by 8), the boom (36) pivotally supported by the boom mounting member (40) is also movable in the vertical direction. Even when the boom (36) is moved up and down, the boom receiver (32) does not move to the arm (18).
The vertical movement of the boom causes the boom to move up and down.
6) does not need to be strictly aligned with the vertical position of the boom receiver (32). In addition, holding means (76, 78, 8
0), when the position of the boom (36) is fixed, it is difficult to mount the boom (36) on the boom receiver (32), but since the boom (36) can be moved vertically, it is easy to use the boom (36). (36) can be placed on and supported by the boom receiver (32).

The boom device (2) of the present invention further comprises
Adjusting means (26, 26) for adjusting the biasing force of the spring (22)
27, 28).

Various accessories such as a nozzle tube (42) and a nozzle (44) are attached to the boom (36), and the weight of the entire boom (36) varies depending on the attached accessories. The appropriate biasing force of the spring (22) changes depending on the weight of the boom (36), but the adjusting means (2
6, 27, 28), the biasing force of the spring (22) can be adjusted to an appropriate biasing force according to the weight of the boom (36).

According to the boom device (2) of the present invention, a friction member is further attached to the boom receiver (32).

Boom (36) due to vibration of the airframe (50)
When rocking, a slip occurs between the boom (36) and the boom receiver (32) that follows the boom (36), but due to the friction member attached to the boom receiver (32). Due to the action of the generated frictional force, the swing of the boom (36) can be further suppressed.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. Figure 1 shows the side boom 36
It is a side view which shows schematic structure of the self-propelled boom sprayer 2 in the state which stored. Self-propelled boom sprayer 2
Is a self-propelled vehicle body 50 having front wheels 52 and rear wheels 54.
The operator can operate the vehicle by getting on the driver's seat 56 of the vehicle body 50. The chemical liquid tank 58 is arranged in the rear portion of the vehicle body 50 so as to surround the driver's seat 56,
Contains chemicals inside. The pump 60 sucks the chemical liquid in the chemical liquid tank 58 and delivers the chemical liquid to the nozzle tube 42 via a liquid supply hose (not shown). A four-joint link device 46 is installed in the front portion of the vehicle body 50, and a front link of the four-joint link device 46 is movable up and down with respect to the vehicle body 50 by driving an electric cylinder 48. The center boom 40 is fixed to the front link of the four-bar link 46 while placing the longitudinal direction horizontally in the width direction of the vehicle body 50, and is vertically movable by driving the electric cylinder 48. The side boom 3 is attached to each of the left and right ends of the center boom 40.
6 is provided, and the side boom 36 is the center boom 40.
And a position of use placed in line with the vehicle body 50 in plan view
It can be switched to the storage position (the position in FIG. 1) in which the tip portion is inclined upward while facing the front-back direction. Further, the side boom 36 is bendable around the support shaft 57 as a fulcrum at an intermediate portion thereof, thereby improving space saving at the storage position. Nozzle pipes 42 are arranged in parallel in the center boom 40 and the side boom 36, respectively. The nozzles 44 are arranged in the nozzle pipe 42 at appropriate intervals, and spray the chemical liquid delivered to the nozzle pipe 42. The vehicle body 50 includes a boom receiving device 1 that receives the side boom 36 in the retracted position from below.
0 is set.

2 and 3 are a front view and a plan view showing the opening / closing mechanism of the side boom 36, showing a state in which the side boom 36 is inclined with respect to the center boom 40 by an angle β. The horizontally rotatable bracket 70 is arranged at the end of the center boom 40, and is rotatably supported in the horizontal direction by a vertical support shaft 72. The vertically rotatable bracket 76 and the side boom 36 are pivotally supported by a horizontally rotatable bracket 70 by a horizontal support shaft 74 so as to be vertically rotatable. The electric cylinder 80 has one end on the center boom 40 and the other end which is rotatable in the vertical direction.
Is rotatably connected in the horizontal direction and the vertical direction, and by expansion and contraction, the horizontal rotatable bracket 70 and the vertical rotatable bracket 76 are rotated in the horizontal direction and the vertical direction, respectively. The tension coil spring 78 is stretched between the upward protrusion of the horizontally rotatable bracket 70 and the side boom 36, and the side boom 36 is provided on the lower surface of the vertically rotatable bracket 76.
It is suspended at a position where the upper surface of the side boom 36 is in contact with the second boom. That is, the vertically rotatable bracket 76, the tension coil spring 78, and the electric cylinder 80 serve as holding means to hold the side boom 36 in the vertical and horizontal rotating positions.

The operation of folding the side boom 36 from the use position to the storage position will be described. When the electric cylinder 80 is contracted in the use position where the side boom 36 is aligned with the center boom 40, the vertically rotatable bracket 76 rotates upward, and the tension of the tension coil spring 78 causes the side boom 36 to rotate. Tilts with its tip facing upwards. The inclination angle of the side boom 36 increases as the electric cylinder 80 shrinks.
Even after 6 reaches a predetermined tilt angle β, the electric cylinder 8
When the reduction of 0 is continued, the horizontally rotatable bracket 70 is horizontally rotated together with the vertically rotatable bracket 76 and the side boom 36, and eventually the side boom 36 becomes the center view boom 40 in plan view. The storage position is an angle of 90 degrees and faces the front-rear direction of the vehicle 50. The predetermined inclination angle β is 25 to 30 degrees.

4 and 5 are a perspective view and a side view of the boom receiver 10. Frame 1 fixed to vehicle body 50
Further, a bracket 14 is fixed to 2. The arm 18 is pivotally supported on the bracket 14 by a pin 20 that is horizontally oriented in the width direction of the vehicle body 50 so as to be vertically rotatable. The arm 18 is bent in a direction projecting from the intermediate portion to the side of the vehicle body 50, and a tip portion belonging to this bent portion is equipped with two side plates 34 standing upright. The space is used as a boom receiver 32. A rubber plate, which is a friction member, is attached to the boom receiver 32. A stay 24 is fixed to the upper surface of the arm 18. The hook 26 has a threaded end of the screw 30 inserted into an insertion hole formed in the stay 24.
It is screwed into 0 and is tightened by nuts 27 and 28 located on both sides of the stay 24 and fixed to the stay 24. The tension coil spring 22 is stretched between the hook 16 and the hook 26 that are fixed to the frame 12, and biases the rotation of the arm 18 upward. The urging force of the arm 18 by the tension coil spring 22 is generated by the hook 2
The hook 26, the nut 27, and the nut 28 serve as adjusting means. The stay 62 is fixed to the frame 12 below the bracket 14. Bolt 64
It is screwed into a nut 65 welded to the stay 62 while the shaft portion is oriented in the vertical direction, and is fixed to the stay 62 by the nut 66 at a position where the head is placed below the base end of the arm 18. The tip of the shaft portion of the bolt 64 abuts on the arm 18 when the arm 18 rotates upward, and restricts the amount of upward rotation of the arm 18.
Prevent it from turning to a position where it cannot be received.

The intermediate part of the side boom 36 is placed on and supported by the nozzle receiver 32 at the time of storage, but when the side boom 36 is folded from the use position to the storage position, the part of the side boom 36 to be supported by the boom receiver 32 is previously attached to the side plate. The center boom 40 is lifted so as to be above the upper end of the center boom 34, the side boom 36 is folded, and it is confirmed that the supported portion of the side boom 36 is directly above the boom receiver 32. Is lowered to support the side boom 36 on the boom receiver 32. When the side boom 36 is supported by the boom receiver 32, the boom receiver 32 is pushed downward by the load of the side boom 36, and the arm 18 pivots slightly downward and the urging force of the tension coil spring 22 and the side force. Boom 3
The load of 6 is balanced.

When the self-propelled boom sprayer 2 travels on an uneven road surface and the vehicle body 50 vibrates, the side boom 36 starts to swing vertically with the horizontal support shaft 74 as a fulcrum. The side boom 36 can absorb the downward swing by the tension coil spring 78, but when swinging upward, an unreasonable load is applied to the vertically rotatable bracket 76,
The horizontal support shaft 74 and the connecting portions at both ends of the electric cylinder 80 may be damaged. When the side boom 36 swings downward, the boom receiver 32 is also pushed downward, and the arm 18 rotates downward, whereby the tension coil spring 22 expands to increase the urging force and buffer the swing of the side boom 36. . Even when the side boom 36 turns upward, the boom receiver 32 follows the side boom 36 due to the biasing force of the tension coil spring 22. Therefore, the generation of impact force due to the collision of the side boom 36 and the boom receiver 32 is prevented. Further, the rubber plate attached to the boom receiver 32 is used for swinging the side boom 36.
Side boom 36 and boom receiver 3 that occur when the robot follows
A frictional force acts on the slip of 2 to enhance the cushioning effect.

The nozzle 44 is replaced depending on the type of crop and the control purpose. Side boom 3 by replacing the nozzle 44
Although the weight of the entire 6 changes and the required biasing force of the tension coil spring 22 also changes, the nut 27 and the nut 28
By changing the attachment position of the hook 26 to the stay 24, the urging force can be changed to an appropriate value.

FIG. 6 shows the nozzle receiver 3 of the side boom 36.
2 is a cross-sectional view of the portion received by 2. The nozzle tube 42 is made of a lightweight and weak material such as an aluminum tube, and is provided on the side of the side boom 36 so as not to come into contact with the boom receiver 32 in the retracted position.
It is installed so that it is above the bottom of the.

FIG. 7 is a cross-sectional view of a portion of the side boom 36 of another embodiment which is received by the nozzle receiver 32. In the embodiment of FIG. 7, the nozzle tube 42 is attached below the bottom surface of the side boom 36, but the portion of the side boom 36 that is received by the boom receiver 32 is protected by inserting the nozzle tube 42. Tube 6
2 is provided, and the nozzle tube 42 is moved to the side boom 36 by the protection tube 62 being received by the boom receiver 32.
It will not be damaged by the weight of.

[Brief description of drawings]

FIG. 1 is a side view showing a schematic configuration of a self-propelled boom sprayer with a side boom stored.

FIG. 2 is a front view showing an opening / closing mechanism of a side boom.

FIG. 3 is a plan view showing an opening / closing mechanism of a side boom.

FIG. 4 is a perspective view of a boom receiving device.

[Fig. 5] Side view of the boom receiving device

FIG. 6 is a cross-sectional view of a portion of the side boom that is received by the nozzle receiver.

FIG. 7 is a cross-sectional view of a portion of a side boom according to another embodiment, which is received by a nozzle receiver.

[Explanation of symbols]

2 Self-propelled boom sprayer (boom device) 18 arms 22 Tension coil spring (spring) 26 Hooks (adjustment means) 27 Nut (adjusting means) 28 Nuts (adjusting means) 32 boom receiver 36 Side Boom (Boom) 40 Center boom (boom mounting member) 48 Electric cylinder (drive means) 50 body (airframe) 64 Volts (Regulatory means) 76 Vertically rotatable bracket (holding means) 78 Tension coil spring (holding means) 80 Electric cylinder (holding means)

Claims (5)

(57) [Claims] 1. A boom (36) having a base end pivotally supported at least vertically in a boom attachment member (40) attached to the machine body (50) and a vertical direction in the machine body (50). An arm (18) rotatably supported by the arm, and a boom receiver (32) which is integrally formed with the arm (18) and receives and supports an intermediate portion or a tip end portion of the boom (36) from below. It has a spring (22) for urging the rotation of the arm (18) upward, and a regulation means (64) for regulating the upward rotation amount of the arm (18). Boom device. 2. Holding means (7) for holding the rotational position of the boom (36) with respect to the boom mounting member (40).
The boom device according to claim 1, further comprising a boom device (6, 78, 80). 3. The boom device according to claim 1, wherein the boom attachment member (40) is movable in the vertical direction with respect to the machine body (50) by a driving means (48). 4. The boom device according to claim 1, further comprising adjusting means (26, 27, 28) for adjusting the urging force of the spring (22). 5. The boom device according to any one of claims 1 to 4, wherein a friction member is attached to the boom receiver (32).