JPH0118218Y2 - - Google Patents

Description

[Detailed description of the invention] In a boom sprayer with a long boom used for pest control work in fields, etc., a boom folding mechanism is used to fold the boom so that it does not become an obstacle when moving without spraying chemicals. A mechanism is provided.

This invention allows the boom to be folded diagonally upward in front of the boom body when not in use.
To provide a boom sprayer equipped with a boom folding mechanism that can easily temporarily lift the front end of the boom to prevent the boom from touching crops during spraying work.

The present invention will be explained in detail below based on a tractor-mounted embodiment shown in the drawings.

As shown in FIG. 1, the boom sprayer of this embodiment is attached to the rear of an agricultural tractor 1 using a three-point hitch, and spray nozzles 4 are attached to the rear end of the machine body 2 at predetermined intervals. A fixed boom 5 is disposed, and movable booms 3, 3, which are extended to the left and right sides of the machine body 2 during work, are connected to both left and right ends of the fixed boom 5 via hinge parts 6, 6.

Next, the structure of the right hinge portion 6 in FIG. 1 will be explained with reference to FIGS. 2 to 4.

A U-shaped member 12 that opens outward is fixed horizontally to the right end of the fixed boom 5, and a U-shaped member 11 that opens toward the fuselage 2 is attached to the right end of the fixed boom 5 to achieve a desired movable boom lifting angle ( for example
45°) and tilt outward corresponding to the U-shaped member 1.
2 and is fixed to the inner end of the movable boom 3 so as to engage with the movable boom 3 orthogonally. These U-shaped members 11,
A cross-shaped shaft housing 10 is fitted inside the side plate portion of 12, and the vertical support shaft 8 inserted therein rotatably connects the U-shaped member 11 on the movable boom 3 side, and the horizontal support shaft 9
The U-shaped member 12 on the fixed boom 5 side is rotatably connected. With this configuration, the hinge part 6 like a universal joint
At this point, the fixed boom 5 and the movable boom 3 are connected.

The vertical support shaft 8 is extended and protruded downward from the U-shaped member 11 to provide a protruding shaft portion 15.
As shown in the figure, when the movable boom 3 is extended laterally to a horizontal position, the drive arm 14 projects rearward from the boom 3, the spring arm 29 also projects forward, and the U-shaped member 12 on the fixed boom 5 side. An arm assembly 13 integrally provided with a guide arm 18 extending toward the inner center is inserted into the protruding shaft portion 15 and rotatably attached.

Vertical guide members 21 and 31 are made to protrude from both side plate portions inside the U-shaped member 12 on the side of the fixed boom 5, and vertical guide surfaces 30 and 33 facing each other are provided in series on the lower surface of the U-shaped member 12. Next, the tip side of the guide arm 18 is bent to provide a rising portion 19 parallel to the vertical support shaft 8, and a guide roller 20 that slides and rotates on the vertical guide surfaces 30, 33 is attached to the end thereof. .

Mounting position of the roller 20 and guide surfaces 30, 33
The effective length is such that when the movable boom 3 is rotated upward about the horizontal support shaft 9 to a desired boom lifting angle (45° in this embodiment), the apex of the roller 20 is U-shaped. It is set so as to face the lower edge of the member 12.

Furthermore, the horizontal guide members 23 and 34 are extended forward and backward from the lower edges of both side plates of the U-shaped member 12, and the vertical guide members 21 and 31 and the U-shaped member 1
A sliding surface of the roller 20 that is continuous with the lower surface of the roller 2 is formed.

Further, upper limit stoppers 22, 22 are provided at a position above the horizontal support shaft 9 of the shaft housing 10, and are brought into contact with the receiving surfaces 28, 32 of the vertical guide members 21, 31 to increase the lifting angle of the movable boom 3. can be regulated. Furthermore, a lower limit stopper 27 is provided on the guide arm 18 and comes into contact with the lower surface of the lateral guide member 23, thereby restricting the downward movement of the movable arm 3 when it is extended. On the other hand, an arm stopper 25 is provided on the spring arm 29 side on the lower surface of the U-shaped member 11 on the movable boom 3 side, and a coil spring 26 is stretched between the tip of the spring arm 29 and the movable arm 3. The stopper 25 is pressed against the spring arm 29, and the relative positional relationship between the arm assembly 13 and the movable arm 3 is always maintained unchanged. With this configuration, even if the movable boom 3 collides with an obstacle during work, the spring 26 absorbs the impact and the movable boom 3 rotates rearward about the vertical support shaft 8, thereby preventing an accident. You can.

Finally, the extensible rod 17 of the hydraulic cylinder 7, whose base is connected to the body 2 side, is connected to the tip of the drive arm 14 via the joint member 16 and the locking pin 15. Note that it is preferable that the hydraulic cylinder 7 is connected to the body 2 and the joint member 16 through a ball joint or the like, since complicated displacements during operation can be easily absorbed.

Furthermore, if an auxiliary roller 24 similar to the guide roller 20 is arranged on the front side of the U-shaped member 11 on the side of the movable boom 3, it is possible to reliably guide the rotation of the movable boom 3 in the front-back direction. suitable.

Next, the operation will be explained.

As shown in FIGS. 2 and 3, when the movable boom 3 is in the extended state, if the hydraulic device (not shown) is operated to extend the telescopic rod 17 of the hydraulic cylinder 7, the drive arm 14 is pushed. Arm assembly 13
tries to rotate counterclockwise around the vertical support shaft 8 in FIG. 3, but the guide roller 20
1 and 31, so the arm assembly 13
cannot rotate, and therefore forward movement of the movable arm 3 is prevented. Instead, upward rotation about the horizontal support shaft 9 is allowed, so as the telescopic rod 17 extends, the movable boom 3 is lifted. When the desired lifting angle (45 degrees in this embodiment) is approached and the guide roller 20 is exposed more than half downward from the lower ends of the vertical guide surfaces 30, 33, the roller 20 is released from being held by the vertical guide members 21, 31. Therefore, the arm assembly 13 is now allowed to rotate around the vertical support shaft 8. Therefore, when the rod 17 is further extended, the movable arm 3 is lifted upward and at the same time begins to move forward. When the guide roller 20 is completely separated from the lower end of the vertical guide members 21 and 31, the upper limit stopper 22 acts to move the movable boom. Since the upward movement of 3 is completely blocked, from now on only rotation about the vertical support shaft 8 is allowed, and the guide roller 20 slides on the lower surface of the horizontal guide member 23 to move the movable boom 3 downward. The movable boom 3, which has been lifted to a desired angle while preventing its movement, is folded forward. At this time, since the auxiliary roller 24 is also in contact with the lower surface of the lateral guide member 34, the forward movement of the movable boom 3 can be reliably guided (see FIG. 4).

Conversely, in order to extend the movable boom 3 at the start of work, etc., it is sufficient to retract the telescopic rod 17 and pull the drive arm 14. The lowering of movable boom 3 is roller 2
Since this is prevented by the contact between the movable boom 3 and the horizontal guide members 23 and 34, the movable boom 3 moves rearward about the vertical support shaft 8 while remaining lifted.
The guide roller 2 is moved almost to the side.
If more than half of 0 comes out from the lower edge line of the vertical guide surface 30,
The movable boom 3 loses its vertical support and moves to the horizontal support shaft 9.
The roller 20 begins to descend downwards around the vertical support shaft 8, and the roller 20 comes to be completely held between the vertical guide members 21 and 31, and henceforth, rotation around the vertical support shaft 8 is completely prevented. Thereafter, the movable boom 3 is rotated downward about the horizontal support shaft 9, and when the movable boom 3 reaches a horizontal position, the lower limit stopper 27 acts to hold the movable boom 3 in a completely extended state.

As described above, according to the present invention, since the hinge part of the movable boom is provided with dedicated vertical and horizontal support shafts and guide members, the boom folding operation can be performed smoothly and reliably, and it is possible to It is possible to provide a highly practical boom sprayer that can easily raise and lower the boom to prevent contact with the ground and to respond to changes in topography.

[Brief explanation of the drawing]

Fig. 1 is a rear view of the boom sprayer according to the embodiment of the present invention, Fig. 2 is an enlarged view of the hinge part in Fig. 1, Fig. 3 is a plan view as viewed from the arrow in Fig. 2, and Fig. 4 is also a view as seen from the arrow in Fig. 2. It is a bottom view. 2... Aircraft, 3... Movable boom, 6... Hinge, 8... Vertical support shaft, 9... Horizontal support shaft, 21, 31...
...Vertical guide member, 23, 34... Horizontal guide member.

Claims (1)

[Scope of utility model registration request] A hinge part 6 that connects the body 2 and the movable boom 3 is provided with a horizontal support shaft 9 that is the center of vertical swing of the movable boom 3 and a vertical support shaft 8 that is the center of the swing of the movable boom 3 in the longitudinal direction. , furthermore, vertical guide members 21 and 31 that guide the swinging of the movable boom 3 in the vertical direction.
and a lateral guide member 2 that guides the swinging in the front-back direction.
A boom sprayer characterized in that 3 and 34 are provided.