JPH058804Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a holding structure for a hydraulic lever in a mobile agricultural machine such as an agricultural tractor.

[Prior Art and Problems to be Solved by the Invention] Generally, in this type of mobile agricultural machine, for example, when this is an agricultural tractor, the lifting and lowering of the working part is controlled by the telescopic operation of a lift arm cylinder. By the way, it is sufficient for such mobile agricultural machinery to be provided with a switching valve (main valve) for operating the cylinder commensurate with the working machinery to which it is normally attached, and this is actually the case. For this reason, for example, even if an agricultural tractor is used as the traveling body of a riding-type seedling planting machine, the main valve of the tractor specification is not configured to perform valve control such as underlap control that is necessary for seedling planting work. Therefore, it is necessary to provide a corresponding sub-valve. At this time, attempts have been made to supply pressure oil to the sub-valves from the main valve, thereby simplifying the oil passage piping. However, if you do it like this,
In order to perform reliable switching control using the sub-valve, it is necessary to keep the first operating lever that switches the main valve set in the pressure oil supply position, but there is no known study in this area. .

[Means for Solving the Problems] In view of the above-mentioned circumstances, the present invention has been devised for the purpose of providing a holding structure for a hydraulic lever in a mobile agricultural machine that can eliminate these drawbacks. In a mobile agricultural machine in which a piping oil passage is configured to extend and contract a hydraulic cylinder by switching a main valve by operating a first operating lever provided in the traveling machine, to perform operation control that cannot be handled by switching the main valve. The sub-valve is connected to the main valve so that the pressure oil supply to the sub-valve is switched from the main valve by operating the first operating lever,
A mounting case that forms an oil path from the main valve to the hydraulic cylinder via the sub-valve and mounts the second operating lever to the traveling aircraft for switching and operating the sub-valve is placed near the first operating lever without covering it. The mounting case is further characterized in that a regulating member is provided in the mounting case to regulate the movement of the first operating lever, which is operated to switch the main valve to the pressure oil supply side, so as to maintain it in this position. be.

With this configuration, the present invention receives pressure oil supply to the sub-valve from the main valve side, and the first operating lever for switching the main valve is inadvertently moved from the pressure oil supply position. This is to prevent it from being stored away.

[Example] Next, an example of the present invention will be described based on the drawings. In the drawing, reference numeral 1 denotes a traveling body of a mobile agricultural machine, and the traveling body 1 is an agricultural tractor with replacement wheels for traveling in paddy fields. A planting work section 3 is provided so as to be movable up and down. This working part 3
The structure is the same as before, including the center float 4, the planting nails 5, the seedling stand 6, the side floats 7, and other component devices.
The top link 2a of the three-point linkage mechanism 2 has a horizontal shaft 2b provided at its front end attached to a top link bracket 1a provided on the traveling body 1, and a retaining pin 1b.
A link boss portion 8 is rotatably supported on this horizontal shaft 2b. Arms 8a and 8b protruding from link boss portion 8 have links 9 and 1, respectively.
0 is connected, but a link 9 connected toward the rear is further interlocked and connected to a sub-valve 11 provided on the working part 3 side with an appropriate connecting means such as a link mechanism interposed therebetween. On the other hand, the link 10 connected toward the front is interlocked and connected to a second operating lever 12, which will be described later. This sub valve 11
is further interlocked with the center float 4 side, and when the second operating lever 12 is set to the automatic lowering position, the sub-valve 11 is switched based on the detected rocking of the center float 4, and the working part 3 is activated. It is configured to automatically control the work posture so as to maintain a predetermined working posture.

Reference numeral 13 denotes a first operating lever for controlling the switching of the main valve 36 during tractor work, and the first operating lever 13 has been provided on the traveling body from the beginning. On the other hand, the second operating lever 12 is separately required when the seedling planting work unit 3 is attached, and this second operating lever 12 is attached to the mounting case 14 in the front-rear direction via the support shaft 12a. It is swingable and is mounted so as to be swingable in the left and right directions via a support shaft 12b. The sub-valve 11 is switched by swinging the second operating lever 12 along the lever guide 14a in the front-rear direction. In addition, the second operation lever 12
is constantly urged toward the stopper 14b side of the lever guide 14a by the ammunition 12c. Also 37
is a hydraulic pump, 38 is a lift arm cylinder, 3
9 is an oil tank.

Furthermore, a cam plate 1 is attached to the front and rear second operating levers 12.
5 and a swinging arm 16 are integrally provided, and swing according to the forward and backward operation.
The front end of the link 10 is pivotally supported on the swing arm 16, so that the sub-valve 11 can be switched when the second operating lever 12 is set at the corresponding guide position. on the other hand,
A cam roller 16a provided on a cam arm 16 interferes with the cam plate 15, and one end of an inner wire 17 is connected to the cam arm 16. In this case, the connection structure of the inner wire 17 to the cam arm 16 is as follows. That is, the wire holder 17a fixed to the front end of the inner wire 17 has a through hole 1.
7b is drilled through the pin 16b provided on the cam arm 16 side, and the distal end of the retaining bullet 16d is elastically inserted into the locking groove 16c provided on the penetrating side of the pin 16b. The fitting and locking prevents the wire holder 17a from coming off the pin 16b, thereby allowing the inner wire 17 to be connected in a one-touch manner. This inner wire 17 is drawn into a clutch case 20 equipped with a speed reducer provided in the middle of a transmission shaft 19 that connects a power take-off shaft 18 on the traveling machine body 1 side and an input shaft 3a on the working part 3 side. When the second operating lever 12 is set to the automatic lowering position, the clutch is engaged and power is transmitted to the working part 3 side.

On the other hand, in the mounting case 14, the base end of the marker operation lever 22 for raising and lowering the markers 21 provided on the left and right sides of the working part 3 is attached to a support shaft 22a.
It is pivotally supported so that it can swing freely in the left and right directions. The central part of the actuating plate 23 is integrally connected to the base end of the lever via a link 22b and a support shaft 23a, and the rear end is attached to both left and right ends of the actuating plate 23, as will be described later. The front end portions of the inner wires 24 interlockingly connected to the marker 21 side are connected to each other. In other words, the front end of the inner wire 24 is provided with a wire holder 24 having a long hole 24a.
b are connected to each other, and a pin 23b protruding from the left and right ends of the actuating plate 23 penetrates and locks this elongated hole 24a, and a retaining bullet is inserted into a locking groove 23c formed on the penetrating side of the pin. The wire holder 24b is prevented from coming off by elastically fitting and locking the tip end of the wire 23d, so that the inner wire 24 can be connected in a one-touch manner here as well.

On the other hand, the inner wires 24 and the outer receivers 26a and 26b of the inner wire 17 are constructed as follows. In other words, the support plate 26 is removably attached to the frame 25 provided at the rear of the mounting case 14 via wing bolts 25a.
Each inner wire 17, 24 is attached to this support plate 26.
Outer receivers 26a and 26b are provided.

Furthermore, the mounting case 14 is integrally assembled to the upper side of the fender 29 where the first operating lever 13 is provided in the driver's seat 28 of the aircraft body 1 using a frame 27 that protrudes toward the inside of the aircraft body. In this case, the mounting case 14 has a notch 14 to allow operation of the first operating lever 13.
is provided, so that it can be assembled near the side of the first operating lever 13 without covering it. Reference numeral 30 denotes a lever stopper which is attached to the outer surface of the notch 14c of the mounting case 14 toward the first operation lever 13 side. Operation lever 1
3 is set in the raised position, that is, the position where the main valve is in the pressurized oil supply state, the lever operation is regulated and held in this position, and the first operating lever 13 is allowed to be freely operated. It is now possible to change and fix the figure into non-restricted postures.

Further, the marker 21 is supported so as to be freely raised and lowered using a support shaft 21a as a fulcrum, and is always urged toward the lowering side by the ammunition 21b. On the other hand, one end of an inner wire 31 is connected to the marker 21, and the other end of the wire 31 is connected to the lift arm 1c.
and the lift rod 2d that connects the lower link 2c.
It is connected to a swing plate 32 which is swingably supported via a support shaft 32a. The outer receiver 31a of the inner wire 31 is provided at the lower end of the lift rod 2d. The swing plate 32 is formed with a long hole 32b and a lock pin 32c.
b, an actuating rod 33 provided on the lower link 2c via a boss 33c so as to be able to move up and down and swing back and forth.
A pin 33a protruding from the upper end is movably fitted, and a stopper 33b is formed at the lower end of the actuating rod 33. Furthermore, the support shaft 3
A cam plate 34 is swingably supported on a bracket 32b provided at 2a via a support shaft 34a.
The cam plate 34 includes the marker operating lever 22.
The other end of the inner wire 24 interlockingly connected to the side is connected thereto, and a locking portion 34b for locking the lock pin 32c is formed. Then, the marker 21 is attached to the locking portion 34b with the lock pin 32.
When c is locked, it is set to be maintained in an upright position against the ammunition. When the working unit 3 is lowered to the working position in this state, when the marker operating lever 22 is set to the corresponding side to lower the left or right marker 21, the corresponding inner wire 24 will be pulled. As a result, the cam plate 34 swings against the ammunition 34c, and the locking portion 34b is disengaged from the lock pin 32c.
As it collapses into the marker position due to the biasing force b,
The swing plate 32 also swings, and the stopper 33b is moved to the boss 3.
Lift the actuating rod 33 so that it is close to 3c,
In this state, the planting work will be formed.
Then, when the machine body reaches a ridge or the like and the second operating lever 12 is operated to the raised position to lift the working part 3 beyond the working area in order to interrupt the work, the lower link 2c
The correlation between the lift rod 2d and the lift rod 2d changes, and the distance between the boss 33c and the support shaft 32a becomes longer. As a result, the stopper 33b comes into contact with the boss 33c and is restricted from moving upward, and the actuating rod 33 is now moved. pulls the swinging plate 32 against the bullet 21b to swing it toward the marker upright side, and as a result, the marker 22 is automatically raised and retracted, and the marker operating lever is set to the neutral position. In this case, the locking pin 32c is locked into the locking portion 34b, and the marker 21 can be automatically raised and stored in conjunction with raising the working portion 3 in this manner.

Furthermore, one piece of the top link bracket 1a into which the front end horizontal shaft 2b of the top link 2a is fitted projects higher than the other side, and the actuating arm 35 is swingable here via a support shaft 35a. It is pivoted on. A roller 35c provided at the tip of one arm 35b of the operating arm 35 faces the upper surface of the top link 2a, and a roller 35c provided at the tip of the other arm 35e extends forward from the link boss portion 8. An actuating pin 35d facing the arm 8b is provided in a position adjustable manner. Furthermore, a bullet 35f is interposed between the arm 35e and the top link bracket 1a, and a roller 35c moves the operating arm 35 to the top link 2.
The actuating pin 35d is biased in the direction approaching the arm 8b and in the direction away from the arm 8b.
Note that 35g is a stopper that prevents the operating arm 35 from rotating more than necessary due to the biasing force of the ammunition 35f. When the working part 3 is lowered to the working position, the actuating arm 35 is moved to the stopper 35g.
The second operating lever 12 is located at a non-operating position where the link boss portion 8 is freely operated in response to the lever operation of the second operating lever 12. When the working part 3 is raised by setting the working part 3 to the raised position, the top link 2a swings upward about the horizontal shaft 2b as a fulcrum. Then, the top link 2a contacts the roller 35c from below, and the actuating arm 35
This causes the operating pin 35d to come into contact with the arm 8b and push the arm 8b downward, thereby setting it in the raised position. The second operation lever 12, which had been in the
OFF state).

In the embodiment of the present invention configured as described above, the lifting and lowering control of the working part 3 is performed using the second operating lever 12.
Pressure oil supply to this sub-valve 11 is performed by switching the sub-valve 11 based on the operation of the center float 4 and the detection operation of the center float 4.
The first operating lever 13 is set to the raised position, pressure oil supplied from the hydraulic pump 37 is sent to the sub-valve 11 via the main valve 36, and the above-mentioned switching of this sub-valve 11 is performed. .

In this way, in the present invention, the main valve 36
If this is insufficient, a sub-valve is provided and this sub-valve is switched and controlled using the second operating lever 12 to perform control suitable for the working section 3. In this case, the main valve 36 is switched to the first It is necessary to set the operating lever 13 to the raised position to enter the pressurized oil supply state. For this reason, in the present invention, it is necessary to keep the first operating lever 13 in the raised position, and for this purpose, with the first operating lever 13 set in the raised position, the lever stopper 30 provided on the mounting case 14 is used. It is sufficient to keep the first operating lever 13 in the regulating position, so that even if you accidentally try to operate the first operating lever 13 toward the neutral position, the first operating lever 13 will be moved from the raised position due to the regulating action of the lever stopper 30. Nothing happens. Therefore, reliable control can be achieved.

Moreover, in this case, when changing the working part to the seedling planting part 3 and making it a rotary tiller, the running wheels for paddy fields must of course be replaced with the original ones, but in this case, the second operation There is no need to remove the mounting case 14 provided with the lever 12 one by one. In other words, in this case, the first operating lever 13 is positioned in the raised position where pressurized oil is supplied by the member on the mounting case 14 side, but the first operating lever 13 is not covered by the mounting case 14 and can be removed from the outside. exposed to. When carrying out plowing work, if the lever stopper 30 is set to the non-restricted position, the restriction on the position of the first operation lever 13 is released and the lever can be operated freely.
Therefore, the attachment case 14 attached as an option can remain attached to the aircraft body from now on, and troublesome attachment/detachment work is not required.

[Function and Effect] In summary, since the present invention is constructed as described above, when a sub-valve with functions not provided in the main valve is provided and operated hydraulically,
Pressure oil is supplied to the sub-valve from the main valve by setting the first operation lever to the pressure oil supply position. Therefore, when a sub-valve is provided, the pressure oil is supplied to the sub-valve in the oil path from the hydraulic pump to the main valve. This not only eliminates the need to provide branch oil passages every time, but also greatly simplifies piping work when sub-valves are retrofitted. Moreover, the first operation lever set at the pressure oil supply position is held at the pressure oil supply position by a regulating member provided in the mounting case, which is necessary for assembling the second operation lever for switching the sub-valve. That will happen. Therefore, it is possible to prevent a problem in which the first operating lever is inadvertently displaced from the pressure oil supply position, and it is possible to perform reliable hydraulic control using the sub-valve.

Then, in the case where the second operating lever is attached as described above, if hydraulic control by the main valve is required again, the first operation can be performed by removing only the regulating member or changing the mounting orientation without removing the mounting case. It is only necessary to release the restriction on the lever, which has the advantage of eliminating the need for attaching and detaching the mounting case once attached.

[Brief explanation of the drawing]

The drawings show an example of the holding structure for the hydraulic lever in the mobile agricultural machine according to the present invention,
Figure 1 is an overall side view with a part cut away of the riding rice transplanter, Figure 2 is a plan view of the main parts of the lifting link mechanism, Figure 3 is a plan view of the main parts of the same, and Figure 4 is the working part of the same. Figure 5 is a side view of the main part of the marker operating mechanism, Figure 6 is a side view of the main part of the second operating lever, and Figure 7 is a partially cutaway view of the mounting case. 8 is a front view of the essential parts of the above, FIG. 9 is an explanatory diagram of the action of the second operation lever, FIG. 10 is a front view of the essential parts of the above, and Fig. 11 is an explanation of the action of the lever return mechanism. FIG. 12 is a plan view of the essential parts, FIG. 13 is a hydraulic circuit diagram, and FIG. 14 is an exploded perspective view of the top link connecting portion. In the figure, 1 is a traveling body, 3 is a working part, 11 is a sub-valve, 12 is a second operating lever, 13 is a first operating lever, 14 is a mounting case, 30 is a lever stopper, and 36 is a main valve.

Claims (1)

[Scope of utility model registration request] For performing operation control that cannot be handled by switching the main valve in a mobile agricultural machine in which a piping oil passage is configured to extend and contract a hydraulic cylinder by switching the main valve by operating a first operating lever provided on the traveling machine. The sub-valve is connected to the main valve so that pressure oil is supplied to the sub-valve by switching the pressure oil from the main valve by operating the first operating lever, and the sub-valve is connected to the hydraulic cylinder via the sub-valve. A mounting case that forms an oil passage and attaches a second operating lever to the traveling aircraft for switching and operating the sub-valve is placed near the first operating lever without covering it, and the main valve is mounted in the mounting case. A holding structure for a hydraulic lever in a mobile agricultural machine, characterized in that a regulating member is provided for regulating the movement of a first operating lever operated to switch to the pressure oil supply side so as to maintain the first operating lever in that position.