JPS581883B2 - Jidoukari Takachiyou Setsuzou Chitsuki Karitorishyuukakuki - Google Patents

Description

[Detailed Description of the Invention] The present invention includes a mechanism for detecting the height of the reaping section relative to the ground, and the detection result by this detection mechanism is configured to be input to a reaping section elevating device equipped with a hydraulic drive device. Regarding reaping and harvesting machines such as combines.

As this type of reaping/harvesting machine with an automatic cutting height adjustment device, a technique disclosed in, for example, Japanese Patent Publication No. 19667/1983 is known.

With this conventional structure, the reaping section moves up and down in a subtle way even when there are relatively small irregularities in the field. Since the machine is driven upward at one end and then driven downward, the amplitude of the reaping section becomes large, which inconveniently causes large vibrations to the machine body.

The present invention aims to eliminate the above-mentioned drawbacks with a simple configuration.

A characteristic feature of the reaping harvester with an automatic cutting height adjustment device according to the present invention is that a throttle valve is interposed in the input piping path from the configuration for detecting the height of the reaping section to the ground to the reaping section lifting device. , This configuration provides the following effects.

In other words, with a simple configuration in which a throttle valve is provided in the input piping path from the mechanism that detects the height of the reaping section to the ground to the reaping section lifting device, even when relatively small irregularities in the field are detected, the detection mechanism The vertical movement of is not transmitted to the hydraulic drive device that moves the reaping section up and down due to the resistance of the throttle valve installed in the oil passage. When the reaping part is not raised and lowered frequently due to continuous small unevenness that is common in the field, and therefore there is a continuous large depression after the small convexity that is common in the field. This has made it possible to prevent the reaping section from being driven upward and then downward, causing the reaping section to create a large amplitude and cause large vibrations to the machine body.

Embodiments of the present invention will be described in detail below with reference to illustrative drawings.

The figure shows a lifting device 1 with three lifting parts at the front of the fuselage.
, a reaping unit 5 consisting of a reaping device 2, a horizontal conveying device 3, a vertical conveying device 4, etc., raises the stem culm to be planted, reaps it,
A combine harvester configured to combine grains and then transport them to a threshing device 6 at the rear of the machine for threshing processing is illustrated.

The reaping section 5 is supported to the machine body via a continuous frame 7, and the connecting frame 7 is connected to a hydraulic cylinder 8.
By swinging around the fixed fulcrum P of the machine body through the telescopic operation (described later), the reaping section 5 is also configured to be able to rise and fall relative to the machine body about the fixed fulcrum P via the continuous frame 7.

In addition, the raising and lowering of the reaping section 5 is performed by controlling the reaping section lifting device 20 using an artificial operating tool 10 for lifting the reaping section, which is provided near the pilot's seat 9, which is disposed on one side of the aircraft body, on the side of the lifting device 1. It is configured to be raised and lowered through the

That is, as shown in FIG. 2 and FIG. 3 A and B, the operating tool 10 is externally fitted and pivotally attached to a pivot pin 11 protruding from the machine frame, and is configured to be able to swing back and forth. A shaft 12 is pivotally attached to the tip of the pivot pin 11.

A bracket 13 is fixed to the shaft 12, and arc-shaped contact terminals 14a and 14b as shown in FIG. A terminal 16 that can contact the terminals 14a, 14b is fixed, and as the operating tool 10 swings back and forth, the terminal 16 selectively contacts the contact terminals 14a, 14b, and within the range of operation movement. is configured to keep in contact with the contact terminal 14a or 14b.

That is, the detection mechanism 1 detects the operating direction and operating displacement amount of the operating tool 10 using the terminal 16 and the contact terminals 14a and 14b.
9, the operation direction of the operating tool 10 is detected by the contact of the terminal 16 with the contact terminal 14a or 14b as the operating tool 10 swings, and the operating direction of the operating tool 10 is detected by the contact between the contact terminal 14a and 1
4b to the contact terminal 14a or 14b
The operating displacement amount of the operating tool 10 is detected by the amount of movement along the .

Further, the contact terminals 14a and 14b of the detection mechanism 19 are . It is connected to an electromagnetic switching valve 15 as a forward/reverse switching mechanism for the hydraulic cylinder 8 for raising and lowering the reaping section.

Then, based on the operating method and operation displacement amount detection of the operating tool 10 by this detection mechanism 19, the switching valve 15 is operated to switch and extend or retract the hydraulic cylinder 8 interposed between the connecting frame 7 and the machine frame. Activate it. It is configured to move the reaping section 5 up and down.

Also. A connector 18 capable of pushing and pulling is interposed between the piston rod 17 of the hydraulic cylinder 8 and the bracket 13 of the shaft 12, so that the telescopic movement of the piston rod 17 and the rotational movement of the shaft 12 are linked. ing.

Due to this interlocking, the terminal 1 is operated by the operation tool 10.
The amount of movement with respect to the contact terminal 14a or 14b of 6 is
While the terminal 16, that is, the operating tool 10 is held at a fixed position, the contact terminal 14a or 14b is moved so that it is located at the intermediate point again, that is, so that the amount of relative displacement of the operating tool 10 with respect to the detection mechanism 19 becomes zero. Detection mechanism 1
9 is displaced in conjunction with the raising and lowering of the reaping part 5, and the switching valve 1
5 to the operating state position of the hydraulic cylinder 8.

Therefore, the detection mechanism 19, the switching valve 15, the hydraulic cylinder 8, etc. constitute a reaping section elevating device 20, and the reaping section is moved in proportion to the operating direction and amount of operation of the human operating tool 10 via this reaping section elevating device 20. 5 is configured to be driven up and down.

Further, a hydraulic cylinder 21 is fixed to the reaping section 5 at a fixed position in front of the lifting device 1.

The piston of this hydraulic cylinder 21 is directed downward (
The mowing section 5 is biased toward the ground (ground side) and is configured to be able to move up and down upon contact with the ground, and is configured as a mechanism that detects the relative height between the reaping section 5 and the ground by this up and down movement.

Further, the hydraulic cylinder 2 is provided at the base of the operating tool 10.
1 and a hydraulic cylinder 2 which is interlocked and connected via oil passages a and b.
3 are connected.

As the piston rod 22 of the hydraulic cylinder 21 moves up and down, the piston rod 2 of the hydraulic cylinder 23 moves up and down.
4 expands and contracts. The operating tool 10 is configured to swing.

That is, the detection result of the piston rod 22 as a mechanism for detecting the relative height of the reaping section 5 with respect to the ground is interlocked and connected to the reaping section elevating device 20 so as to be used as an input for operating the reaping section elevating device 20. It is composed of

Further, since the mounting position of the hydraulic cylinder 23 on the machine frame can be changed and adjusted via the long holes 27, the relative interlocking relationship between the piston rod 22 and the piston rod 24 can be changed and adjusted. .

Furthermore, a throttle valve 25 is interposed in the oil passage a connecting the hydraulic cylinders 21 and 23, and is configured to provide resistance to the relatively small vertical movement of the piston rod 22 against the piston rod 24. ing.

Further, the pin 26 connecting the piston rod 24 of the hydraulic cylinder 23 and the base of the operating tool 10 is configured to be detachable, and the connection between the operating tool 10 and the piston rod 24 can be switched between a connected state and a disconnected state. has been done.

According to the above configuration, when the relative height between the reaping part 5 and the ground, that is, the reaping height changes due to irregularities in the field while the machine is traveling for reaping, the piston rod 22 moves up and down.
With this vertical movement, the piston rod 24 expands and contracts, causing the operating tool 10 to swing.

Then, due to this swinging, the terminal 16 comes into contact with the contact terminal 14a or 14b, and the switching valve 15 is moved to the hydraulic cylinder 8.
is switched in the direction of extension or contraction,
The reaping section 5 is raised and lowered.

Then, in conjunction with the raising and lowering of the reaping section 5, the amount of displacement of the detection mechanism 19 with respect to the operating tool 10 is displaced to zero, and the detection mechanism 1
At step 9, the switching valve 15 is switched to the neutral position again, and the vertical movement of the reaping section 5 is automatically stopped.

Therefore. When the cutting height of the reaping section 5 changes, the piston rod 22 as a detection mechanism moves up and down, and this up and down movement activates the reaping section lifting device 20 to maintain the reaping section 5 at a constant cutting height.

In addition, due to relatively small irregularities in the field, the piston rod 2
Even if 2 moves up and down slightly, this up and down movement is difficult to be linked to the piston rod 24 due to the resistance of the throttle valve 25 provided in the oil passage a, and due to relatively small irregularities in the field, the reaping section 5
The cutting height is not changed, and the cutting unit 5 does not move up and down frequently due to continuous small irregularities that often occur in fields.

Furthermore, when the piston rod 24 of the hydraulic cylinder 23 and the operating tool 10 are disconnected by detaching the pin 26, the operating tool 10 is disconnected.
0, the reaping section 5 can be raised or lowered as desired by operating the lifting device 20.

Furthermore, by changing and adjusting the mounting position of the hydraulic cylinder 23,
Even if the intended cutting height position of the reaping section 5 is changed, the desired cutting height can be automatically adjusted.

[Brief explanation of the drawing]

The drawings show an embodiment of a reaping harvester with an automatic cutting height adjustment device according to the present invention, and FIG. 1 is a side view illustrating a combine harvester;
FIG. 2 is an explanatory diagram showing the transmission structure, FIG. 3A is a vertical sectional view of the main part, and FIG. 3B is a side view of the main part. 5... Reaping section, 20... Reaping section lifting device, 22... Detection mechanism, 25... Throttle valve.

Claims (1)

[Claims] 1. A reaping harvester configured to include a mechanism 22 for detecting the height of the reaping section 5 with respect to the ground, and to input the detection result by the detection mechanism 22 to a reaping section lifting device 20 equipped with a hydraulic drive device 8. A reaping harvester with an automatic reaping adjustment device, characterized in that a throttle valve 25 is interposed in the input piping path from the detection mechanism 22 to the reaping section lifting device 20.