JPS6141524B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a reaping section on a traveling vehicle body that can be raised and lowered by a hydraulic actuator, and a sensor that detects the height of the reaping section above the ground.
A spool of a control valve for the hydraulic actuator and the sensor are linked to constitute a cutting height control mechanism that automatically maintains the height of the cutting section above the ground within a set range, and A manual operating tool is linked to the control valve via a flexibility mechanism that allows the control valve to be operated up and down, and the control valve can be freely operated up and down by operating beyond the range of flexibility provided by the flexibility mechanism. This invention relates to a cutting height control mechanism for a combine harvester.

In the above method, when there is a locally raised part in the field during the cutting height control state,
The structure is such that the reaping section can be forcibly raised by operating beyond the flexible range. Conventionally, when adjusting the cutting height by manual lifting and lowering operations without using a sensor, for example, when cutting in a direction perpendicular to the rows (so-called horizontal cutting) or in poor field conditions, Also, the reaping section was raised and lowered by an operation beyond the above-mentioned flexible range.

However, in raising and lowering the reaping section, which relies solely on manual operation, an additional operation must be made within the flexible range, and the operation stroke is large, making it difficult to perform the raising and lowering operations on the reaping section.

In view of the above-mentioned points, it is an object of the present invention to enable manual lifting and lowering of the reaping section to be performed satisfactorily with a small operation stroke.

Next, embodiments of the present invention will be described in detail based on illustrative drawings.

A reaping section 4 consisting of a pulling device 1, a reaping device 2, and a conveying device 3 is mounted on a traveling vehicle body equipped with a threshing device 6 for threshing grain culms conveyed by a feed chain 5 and a control section 7. A combine harvester is constructed by being provided so as to be able to freely swing up and down and be driven via a single-acting hydraulic cylinder 8 as an example of a hydraulic actuator.

A support bracket 1 is attached to the frame 9 of the reaping section 4.
As shown in FIGS. 2 and 3, the support bracket 10 is provided with mounting members 11, 11 and a wire receiving member 12, and the mounting member 1 is
Ground contact type sensors 13 are individually pivotally connected to the sensor 1 so as to be swingable.

To configure the control valve V for the hydraulic cylinder 8, as shown in FIG. 4, a spool 15 for ascending operation and a spool 16 for descending operation are provided in the valve body 14 so as to be slidable, respectively.
Compression spring 1 on both spools 15 and 16 respectively
7 and 17 are attached so that the cylinder 8 can be maintained in a vertically stopped state in a non-operating state.

An operation piece 18 for operating the spools 15 and 16 by contacting the spools 15 and 16 is connected to a support shaft 19, and the support shaft 19
is rotatably provided on the frame 20 to which the valve V is attached, and a linking bracket 21 is rotatably attached to the end of the support shaft 19, and the linking bracket 21 and the sensor 13 are connected via a release wire 22. The control valve V is operated as the sensor 13 swings up and down with respect to the mounting member 11, and the height of the reaping section 4 above the ground is automatically set within a setting range based on the height above the ground detected by the sensor 13. The cutting height control mechanism 23 is configured to maintain the cutting height within the range.

In the figure, 24, 24 are for the mounting members 11, 11,
This is a tension spring that urges the sensors 13, 13 to swing downward. In the figure, reference numeral 25 indicates that the sensor 13 swings upward with respect to the mounting member 11, and the release wire 22 This is a tension spring tensioned on the interlocking bracket 21 in order to rotate the operation piece 18 toward the upward operation side when it is loosened.

Linkage bracket 21 for the release wire 22
On the side, the receiving member 2 of the outer wire 22a
6 is pivotally connected to an operating tool 27 that is swingably mounted around the horizontal axis X, and the receiving member 26
Control valve V
The sensors 13, 13 are swung relative to the mounting member 11 without operating the frame 9, and the sensors 13, 13 are protruded downward to a greater extent than the frame 9, resulting in a high mowing condition, and a low mowing condition, in which the sensors 13, 13 protrude smaller than the frame 9. The switching mechanism 28 is configured so that the set cutting height can be changed between the two states, and the switching mechanism 28 can be changed to a retracted state in which the cutting height is swung upward to a greater extent and the cutting height is hardly protruded from the frame 9.

An angled bracket 29 is provided to be able to swing integrally with the outer wire receiving member 26, and
A release wire 32 is connected to the angle bracket 29 and a U-shaped bracket 31 which pivotably connects the middle of a spring mounting member 30 to which the ends of the tension springs 24, 24 are attached to the sensor 13. Sensor 1 is connected via the
The configuration is such that the downward biasing force applied to No. 3 is not changed.

In order to support the support shaft 19 on the frame 20,
A boss member 33 is fitted around the support shaft 29 so as to be relatively rotatable.
A lever portion 34 is connected to one end side of the boss member 33, and the lever portion 34 and a lift operation lever 35 as a manual operation tool are interlocked and connected via a ring 36. A plate body 37 is integrally and rotatably attached to the other end of the boss member 33, and as shown in FIG. 5, a ball engagement recess 38 is formed in the plate body 37.
A ball 39 that fits into the recess 38 is biased toward the insertion side by a compression spring 40, and the boss member 33 is rotated by the lever 35, and the biasing force of the spring 40 is used to perform the following operation. The fixing mechanism 43 is configured to be fixed to a third position for automatic elevation control.

A pair of notch grooves 4 having a predetermined width in the circumferential direction are provided at the end of the boss member 33 opposite to the lever portion 34 with a phase difference of 180 degrees in the circumferential direction.
1, 41, and the pin 42 attached to the support shaft 19 is engaged in the notched grooves 41, 41, and with the manual lifting operation lever 35 fixed, the notched grooves 41, 41 are inserted.
The operating piece 18 is configured to be operated within a range within which movement of the pin 42 is permitted.

Next, a description will be given of the operating state in which the manual elevating operation lever 35 is positioned at each of the first to fourth positions P ₁ , P ₂ , P ₃ , and P ₄ .

That is, as shown in FIG.
At position P ₁ , the pin 42 of the boss member 33
The support shaft 19 is forcibly rotated by contact with the sensor 13, and only the lifting operation spool 15 is operated.
The reaping section 4 is forcibly raised regardless of the displacement. In addition, as shown in FIG.
At position _P2 , with the reaping part 4 raised to the non-working area, the notch groove 4 in the boss member 33 is
1 - By contacting the pin 42 with the side wall, the sensor 1
3 prevents the support shaft 19 from rotating toward the side that operates the descending operation spool 16,
This is to maintain the raised state of the reaping section 4. or,
As shown in Fig. 6C, the manual lift operation lever 3
At a third position P 3 where the sensor 5 is swung from the second position P ₂ to the side opposite to the first position P ₁ , _the sensor 1
3, both spools 15 and 16 for lifting and lowering operations are selectively operated within the permissible displacement range of the pin 42 relative to the notched grooves 41 and 41, and the ground height of the cutting section 4 is automatically adjusted. The cutting height is controlled to maintain the cutting height within the set range. In addition _, as shown in FIG.
At position _P4 , even if the reaping section 4 is lowered from the raised state of the non-working area to the working area, and furthermore, the sensor 13 is in the state of raising the reaping section 4, regardless of the displacement of the sensor 13. First, the reaping section 4 is forcibly lowered.

A coiled spring 44 as an example of a biasing mechanism is interposed between the frame 20 and the lever portion 34, and is configured to swing the lifting operation lever 35 back to the second position _P2 and maintain that state. There is. When the fixing mechanism 43 is in the fixed state, it is fixed at the third position _P3 against the biasing force of the coiled spring 44 due to its static frictional force, but when returning from the fourth position _P4 , the fixing mechanism 43 is It is configured so that it can overcome the dynamic friction force and return to the second position without being fixed at the third position.

As shown in FIG. 4, in the middle of the flow path for communicating and connecting the pump port P and the cylinder side port C of the lifting operation spool 15, as shown in FIGS. 6 and 7, A tapered land 45 is formed to form a rippled flow path.

On the other hand, a valve element 4 opens and closes a flow path for communicating and connecting the cylinder side port C and the tank port T by contacting and pressing the lowering operation spool 16.
6, and small-diameter communication holes 47 are provided in the valve body 46 so that a curving flow path is formed within a predetermined movement range as shown in FIGS. 6 and 7.
... has been formed. As mentioned above, both spools 1
5 and 16, the first and fourth
In each manual lifting operation by human power at positions P ₁ and P ₄ , the reaping part 4 is raised and lowered at high speed, while in the automatic lifting control state at the third position P ₃ , the reaping part 4 is raised and lowered at high speed. 4 is raised and lowered at low speed, and in the automatic raising/lowering control state, the notched grooves 41, 41 are deviated to the rising side, and the sensor 13 detects a large rise. If the sensor 13 is displaced beyond a predetermined value, the reaping section 4 is driven upward at high speed only by the lifting operation, so that collision of the reaping section 4 with the ground can be reliably avoided.

A coupling pin 48 as an example of a coupling device is provided in the coupling bracket 21 in a slidable manner, and a hole 49 is provided in the lever portion 34 to fit and lock the pin 48 in the second position _P2. By fitting and locking the bracket 21 into the hole 49 of 48, the bracket 21 and the lever portion 34 are directly connected, and both spools 15, 16
It is configured such that it can be operated by a lift operation lever 35.

A compression spring 50 is interposed in the connecting pin 48 to urge the connecting pin 48 to move away from the lever portion 34 .
One end of a coiled spring 51 is connected to the head portion of the switch 8, and the other end of the coiled spring 51 and the angle-shaped bracket 29 are interlocked and connected via a release wire 52. Ingredients 27
As the cutting height is switched from the cutting height setting position to the retracted position, the connecting pin 48 is switched to the connected state against the biasing force of the compression spring 50, the sensor 13 is switched to the retracted state, and the connecting pin 48 is switched to the connected state. The configuration is such that the switching to and from the above are performed all at once. At this time, the lift operation lever 35 moves to the second position P ₂
Even if the pin 48 is not in the position, the tip of the pin 48 comes into contact with the lever portion 34 while being biased toward the connection side by the coiled spring 51, and as the operating lever 35 is operated to the second position _P2 , the pin 48 is automatically fitted into the hole 49.

An operating piece 1 for linking the sensor 13 and both spools 15 and 16 of the control valve V.
8. The support shaft 19, the linking bracket 21, and the release wire 22 are collectively referred to as a mechanical linking mechanism.

Lifting operation lever 3 for the above mechanical linkage mechanism
In the above embodiment, the lever 35 is directly connected to the
The lever portion 34, which is a member linked to the link bracket 21, is configured to be connected to the link bracket 21.
For example, the operation lever 35 can be directly connected to the bracket 2.
It may also be connected to 1.

In the above embodiment, the connecting pin 48 is automatically operated when the sensor 13 is switched to the retracted position,
Although the operating lever 35 is configured so that the linking lever portion 34 and the mechanical linking mechanism for the sensor 13 are connected, in the present invention, the linking pin 4
8 may be manually operated to switch between a connected state and a disconnected state.

The mechanical linkage mechanism and the manual lift operation lever 35
In order to link these within a certain range of flexibility,
The configuration is not limited to the notch grooves 41, 41 and the pin 42 as described above, but for example, the boss member 31 and the support shaft 19.
The frictional resistance in the direction of relative rotation is made different in a predetermined phase between the
Various manufacturing modifications are possible, such as setting it within a flexible range and configuring it so that it rotates integrally without relative rotation due to frictional resistance in a state beyond that range, and by doing so, the flexible mechanism 41 , 42.

In summary, the present invention provides the above-mentioned cutting height control mechanism for a combine harvester in which the manual operating tool 35
Alternatively, it is characterized in that a connecting tool 48 for interlockingly connecting the linking member 34 and the control valve V without intervening the accommodating mechanisms 41 and 42 is provided so as to be able to connect and release the connection.

In other words, in the automatic cutting height control state, the flexibility mechanism 4
By operating the manual tool 35 beyond the range of flexibility provided by 1 and 42, it is possible to artificially force the reaping part 4 upward in the case of localized protrusions, etc. Although the reaping section 4 can be raised and lowered when mowing, if the reaping section 4 is to be raised and lowered only by the manual operating tool 35, such as during horizontal mowing, the connecting tool 48 must be switched to the connected state. By placing the control valve V in a flexible state, the reaping section 4 can be raised and lowered with a small operation stroke, and reaping travel by raising and lowering the reaping section 4 can be carried out easily and efficiently only by manual operation. It became.

[Brief explanation of the drawing]

The drawings show an embodiment of the cutting height control mechanism for a combine harvester according to the present invention, FIG. 1 is a partially omitted side view of the combine, FIG. 2 is a side view of the main part showing the sensor, and FIG. 3 is a cutting height control mechanism. Perspective view showing the control mechanism, 4th
The figure is a sectional view of the main part of Fig. 3, Fig. 5 is a partially exploded sectional view taken along the - line in Fig. 3, Fig. 6 is an explanatory view showing the operating state of the valve, and Fig. 7 is an explanatory view showing the operating state of the valve. The figure is a hydraulic circuit diagram. 4...Reaping section, 8...Hydraulic actuator, 1
3...Sensor, 15, 16...Valve spool, 23...Mowing height control mechanism, 34...Linking member, 35...Manual operation tool, 41, 42...Accommodation mechanism, 48...Connection tool, V...control valve.

Claims (1)

[Claims] 1. The reaping section 4 is connected to the traveling vehicle body by a hydraulic actuator 8.
The reaping section 4 is provided with a sensor 13 for detecting its height above the ground, and the spools 15, 16 of the control valve V for the hydraulic actuator 8 are linked with the sensor 13 to A cutting height control mechanism 23 that automatically maintains the height of the cutting section 4 above the ground within a set range.
The manual operating tool 35 is linked to the control valve V via the flexibility mechanisms 41 and 42 that allow the mowing height control mechanism 23 to raise and lower the control valve V, and the flexibility mechanism 41,
The cutting height control mechanism for a combine harvester is configured such that the control valve V can be operated up or down by operating the control valve V beyond the flexible range of the manual operation tool 35 or the member 34 linked thereto, A cutting height control mechanism for a combine harvester, characterized in that a coupling device 48 for interlocking and coupling the control valve V without going through the accommodating mechanisms 41 and 42 is provided so that the coupling and coupling can be freely operated.