JPH0140444Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a combine harvester equipped with a grain culm handling depth adjustment device, more specifically, a grain culm handling depth adjustment device, and this adjustment device is connected to a detection signal from a long and short culm detection sensor. The present invention relates to a combine harvester configured to be controlled by

This type of combine harvester is used not only for harvesting and threshing rice, but also for harvesting and threshing wheat, but in the case of rice, there is generally little variation in length, and the lengths are generally uniform. On the other hand, in the case of wheat, there is a large variation in length even in the same field, and the length is uneven overall.

However, when harvesting and threshing rice is carried out using the combine harvester, since there is little variation in the length of the rice, the handling depth adjustment device can be stably controlled by the sensor; When working, the wheat has large variations in length and is irregular, so detection signals are frequently output from the sensor, and the handling depth adjustment device must be frequently controlled to ensure stable threshing. There were problems such as not being able to carry out the work, and shortening the lifespan of the handling depth adjustment device and sensor.

The present invention was devised in view of the above-mentioned problems.When harvesting and threshing rice, the width of the dead zone of the sensor is made small to accurately control the handling depth, and in the case of wheat, the dead zone of the sensor is is increased to stably control the adjustment device,
Furthermore, the dead zone width can be adjusted using the same sensor without using any special equipment.

That is, in order to detect the grain culm length in a combine harvester, the grain culm is clamped approximately horizontally by the clamping and conveying device in the threshing section, and the grain culm is detected by a sensor immediately before being fed to the threshing section. Focusing on the fact that in the case of rice, the tips are soft and droop downwards, in the case of wheat, the tips are hard and are maintained in an approximately straight line from the clamping position to the tip of the tip. The width of the dead zone when detecting grain culms by both sensors is configured such that the width of the dead zone is narrower on the lower end side (near the grain culm) and wider on the upper end side of the root (side away from the grain culm). The width is small and the dead zone is made large when wheat is detected.

Hereinafter, the present invention will be explained with reference to embodiments of the drawings.

In the figure, 1 is the body of a combine harvester, which is equipped with a traveling device 2 at the bottom, a threshing section 4 with a grain culm holding and conveying device 3 at the top, and a reaping section 5 at the front. A vertical conveyance device 6 is interposed between the reaping section 5 and the threshing section 4, and the reaping section 5
The harvested grain culm is lifted by the vertical conveyance device 6,
The grain culms are delivered to the clamping and conveying device 3, and the grain culms are clamped in a substantially horizontal manner by the conveying device 3, and conveyed into the interior of the threshing section 4 through the entrance portion 7 to be threshed.

The vertical conveyance device 6 is supported so as to be able to swing vertically with respect to the machine body 1, and the conveyance device 6 is swung by a piston device (not shown) controlled by a solenoid valve to remove grain culms. The so-called conveyance device 6
Together, they constitute a handling depth adjustment device, and hereinafter the vertical conveyance device 6 will be referred to as the handling depth adjustment device.

The handling depth adjusting device 6 is adjusted by controlling each solenoid SoL ₁ and SoL ₂ in the solenoid valve, and each solenoid SoL ₁ and SoL ₂ is connected to the entrance part 7 of the threshing section 4 in the back. The sensors 8,
9 and 10 have detection probes 11 and 12 extending downward,
It is equipped with 13.

That is, a key switch is connected from the power source E side to the connection circuit between the one solenoid SoL ₁ and the power source E.
SW, automatic switch SW ₁ , conveyance detection sensor 10
Normally open contact SW _L -a, normally open contact SW M -a of short culm detection sensor 9, normally open contact SW _M -a of long culm detection sensor 8
SW _H -a, an on-delay circuit 14, and a normally closed contact LS1-b of a limiter that regulates the adjustment limit position of the depth adjustment device ₆ are interposed, respectively, and this solenoid SoL ₁ controls the depth adjustment device 6. I am trying to adjust it to the right side.

Further, in the connection circuit, a branch circuit leading to the other solenoid SoL ₂ is formed between the normally open contact SW _L -a of the conveyance detection sensor 10 and the normally open contact SW _M -a of the short culm detection sensor 9. , to this branch circuit, from the power source E side, the normally closed contact SW _M -b of the short culm detection sensor 9, the on-delay circuit 15, and the normally closed contact LS ₂ -b of the limiter that controls the adjustment limit position of the adjustment device 6 are connected. Interpose this solenoid
SoL ₂ is intended to adjust the adjustment device 6 to the deep handling side.

Therefore, in the combine harvester as described above, the present invention uses the long culm and short culm detection sensors 8 and 9 to determine the distance between the edges toward the grain culm holding side by the grain culm holding and conveying device 3. In other words, the dimension between the effective operating positions of the respective tentacles 11, 12, where the tentacles 11, 12 are substantially actuated by contact with the grain culm, is
It is constructed so that the lower end side of the tip is sandwiched and the upper end side of the base is wider.

Specifically, as shown in FIG. 3, the short culm detection probe 12 is bent so that its central lower half approaches the long culm detection probe 11 side via the stepped portion 12a, and the short culm detection probe 12 is The distance _l1 between the upper part 12b of the probe 12 and the long culm detection probe 11 is widened, and the short culm detection probe 1 is widened.
The distance l ₂ between the lower part 12c of 2 and the long culm detection probe 11 is narrowed.

In order to change the vertical spacing between the probes 11 and 12, as shown in FIG. The opposing surface may be vertical, and the surface opposite to the opposing surface on the conveying device 3 side may be inclined toward the long culm detection probe 11 as it goes downward.

Further, as shown in FIG. 5, the short culm detection probe 12 may be tilted so that the lower end thereof is directed toward the long culm detection probe 11, and furthermore, the short culm detection probe 12 may have a stepped portion as shown in the above embodiment. 12a may have a gentle inclination angle as shown in FIG.

Although the long and short culm detection sensors 8 and 9 are shown separately in the drawings, these sensors 8 and 9 can also be formed integrally.

Furthermore, the long and short culm detection jancers 8 and 9 are not limited to the contact type as in the above-mentioned embodiments, but may be non-contact type sensors such as photoelectric type sensors.

The present invention is constructed as described above, and when detecting the long and short lengths of rice during harvesting and threshing, since the tip of the rice is soft and hangs downward, the long and short culm detection touch is used as shown in Figure 3. Even if the width of the dead zone between the lower portions of the sensors 11 and 12 is small, it is detected.
When the tip of the ear tip is located within the distance l ₂ between the contactors 11 and 12, that is, within the dead zone width, the solenoids SoL ₁ and SoL ₂ in FIG. 2 do not operate, and the handling depth adjustment device 6 also operates. It was operated at the normal handling depth without being damaged, and the tip of the tip was short culm detection probe 1.
When separated from SoL 2, the solenoid SoL ₂
is operated, the adjustment device 6 is adjusted to the deep handling side, and the tip of the tip is adjusted to the long and short detection probes 11, 1.
2, the other solenoid SoL ₁ is operated and the adjusting device 6 is adjusted to the shallow handling side.

In addition, during harvesting and threshing of wheat, since the tip of the grain is hard, the lengths are detected between the upper parts of both the tentacles 11 and 12. In other words, the distance _l1 between the tentacles 11 and 12 is large, and even a large dead zone width is detected. This is detected, and the handling depth adjustment device 6 is adjusted in the same manner as in the case described above. Therefore, even in the case of wheat with a large length bar, the handling depth by the adjustment device 6 is adjusted. Adjustments are made stably.

As explained above, in the present invention, the width of the dead zone when detecting grain culms by the long culm detection sensor that controls the handling depth adjustment device is configured to be narrow at the lower tip side and wide at the upper end side of the root. In the case of rice plants that are soft and do not sag when detecting grain culm length, it can be detected sensitively even in a small dead zone, and in the case of wheat that has hard ears, it can be detected even in a large dead zone, so that the length of the grain culm can be easily detected. When detecting wheat with large variations, it is possible to stably adjust the handling depth adjustment device without having to adjust it frequently, and the adjustment of the dead zone width requires special equipment. Moreover, there is no need for a separate switching operation to adjust the dead zone width, and the adjustment can be done automatically depending on the type of grain culm to be harvested and threshed by the combine harvester.

[Brief explanation of drawings]

Figure 1 is a slope view of the combine harvester according to the present invention.
FIG. 2 is a control circuit diagram of the handling depth adjusting device, FIG. 3 is a front view of the sensor portion, and FIGS. 4 to 6 are front views showing other embodiments. 6... Handling depth adjustment device (vertical conveyance device), 8, 9
...Sensor, l ₁ , l ₂ ...Detection contact interval (dead band width).

Claims (1)

[Scope of utility model registration request] A combine harvester comprising a grain culm handling depth adjustment device and configured to control the grain culm handling depth adjustment device by detecting the grain culm using a long culm detection sensor and a short culm detection sensor. A combine harvester equipped with a grain culm handling depth adjustment device, characterized in that the width of the dead zone at the time of detection is narrower near the grain culm and wider on the side away from the grain culm.