JPH0126653B2 - - Google Patents

Description

Detailed Description of the Invention The present invention provides a combine harvester that adjusts the handling depth based on two culm length detection results detected before and after the handling depth adjustment device, in order to make the handling depth adjustment accurate. Relating to a handling depth control device. More specifically, a grain culm detection mechanism for a grain culm that is pulled up, and a handling depth that adjusts the tip position of the grain culm supplied to the threshing device based on the culm length detection result of the culm length detection mechanism to obtain an appropriate handling depth. a grain tip passing position detection mechanism of a horizontally fallen grain culm, the grain tip of which is received and supported, is provided behind the handling depth adjusting device and near the entrance of the threshing device; The present invention relates to a handling depth control device for a combine harvester, including a correction means for outputting a correction signal of the culm length detection result based on detection of the tip of the head coming off the proper passing position.

Conventionally, as a handling depth control device for this type of combine harvester, the detection result of the culm length detection mechanism of the raised grain culm is corrected based on the detection result of the ear tip passing position detection mechanism, and the corrected detection result is By activating the handling depth adjustment device based on the
There are devices known that are configured to solve the problem of changes due to wetness, fluctuations in the amount of particles, etc., and to adjust the handling depth with virtually no detection errors (for example, (Refer to Publication No. 160621).

The conventional technology has the following problems. In the conventional configuration, if there is no grain culm at the position of the ear passing position detection mechanism, such as when the reaping and harvesting work is interrupted after finishing one process, it is understood that the grain culm is short. Therefore, there is a problem in that the driver has to stop the operation of the tip passing position detecting mechanism each time an erroneous correction is made. Furthermore, when reaping and harvesting work is restarted, the handling depth adjustment based on the uncorrected culm length detection result is performed for a certain period of time due to the above-mentioned stop operation, which causes a delay in proper handling depth adjustment. It was hot.

SUMMARY OF THE INVENTION The present invention aims to provide a combine harvester handling depth control device that solves the above problems of the prior art.

In order to achieve the above object, the handling depth control device for a combine harvester of the present invention detects the presence or absence of a grain culm at the position of the ear passing position detection mechanism, and when the grain culm is absent, This is characterized by the provision of malfunction prevention means that maintains the output of the correction signal.

Therefore, according to the present invention, the following effects can be obtained. In other words, even when one step of work is finished and the next step of reaping and harvesting is restarted, it is possible to accurately predict the culm length immediately after reaping by using the correction amount just before the grain culm disappears, and it is possible to accurately predict the culm length immediately after reaping starts. Grain culms immediately after handling can be handled automatically and the depth can be adjusted appropriately. The amount of drooping tips of grain culms in one field does not change significantly throughout the field, so grain culms in the entire field can be handled appropriately and harvested efficiently by adjusting the handling depth, resulting in higher yields than in the past. You can increase the amount.

Embodiments of the present invention will be described in detail below based on the drawings.

Figure 1 shows the side view of the front part of the combine, which is equipped with a crawler traveling device 1 and a device 3 for threshing while holding and conveying grain culms with a feed chain 2 installed on one side. At the front of the machine, there are a device 4 for raising the grain culms planted in the field into an upright position, a reaping device 5 for cutting the base of the raised grain culms, an auxiliary conveyance device 6 for transporting the harvested grain culms to the rear, and A reaping processing section is connected and equipped with a rear conveyance device 7, etc., which conveys grain culms in an upright position to be delivered rearward and upward, changes them to a collapsed position at the end of conveyance, and supplies them to the threshing device 3. has been done. As the process progresses, the target grain culms are raised and harvested, and the harvested grain culms are successively threshed.

Next, regarding the handling depth control device, see Figures 1 to 4.
This will be explained based on the diagram.

The rear conveying device 7, which is installed in the grain conveying path that pulls up the target grain culm, reaps it, and supplies it to the threshing device 3 in a fallen posture, changes its posture by vertically swinging around the horizontal axis X at its terminal end. Accordingly, the handling depth adjustment device is configured to change the supporting position of the grain culm delivered from the auxiliary conveyance device 6 in its longitudinal direction, and change the position of supplying the grain culm to the feed chain 2 in the grain culm longitudinal direction. has been done.

a potentiometer 8 that detects the swinging position of the rear conveyance device 7 around the horizontal axis X as its attitude, and outputs a higher voltage as the swinging position increases;
A culm length detection mechanism 9 is also provided for detecting the position of the grain culm tip in an upright position at a location on the upper side of the conveyance direction than the conveyance device 7. This detection mechanism 9 has three sensors 9a, 9b, and 9c arranged in parallel at appropriate intervals in the vertical direction on the back of the lifting device 4, which are swung back and forth by contact with the grain culm, and these sensors 9a... A state where all of the sensors 9c are not swung backwards, a state where only the lower sensor 9c is swung backwards, a state where the lower and intermediate sensors 9c, 9
b is swung backwards, and all sensors 9
In addition to detecting the tip passing position in four stages: a... and backward swinging, normally open electric switches Sa, Sb, and Sc are provided, which are turned on and operated separately when each sensor 9a swings backward. , and a voltage generating circuit 9d is provided which generates a higher voltage as more of these switches Sa are turned on and operated.

Based on the voltage signal as a detection result from the culm length detection mechanism 9, the conveyance device 7 is automatically moved to a preset posture corresponding to the detection value of the detection mechanism 9 in order to maintain a constant handling depth. A programmable control mechanism is provided for vertically swinging.

That is, when the difference between the voltage signal of the detection mechanism 9 and the voltage signal from the potentiometer 8 is within the set tolerance range, the conveyance device 7
A circuit 10 for comparing both signals is provided, and the transport device 7 is swung upward based on the signal from this circuit 10. A circuit 11a that determines that it is necessary to swing the conveyor device 7 downward and a circuit 11b that determines that it is necessary to swing the conveying device 7 downward are provided. The conveyance device 7
A hydraulic cylinder 12 that swings upward by its extension action and swings it downward by its contraction action.
The extension operation operating section 13a and the shortening operation operation section 13b of the electromagnetic control valve 13 for switching the operating state of the cylinder 12 receive signals from the upward swing discrimination circuit 11a and the downward swing discrimination circuit 11b. It is configured to be operated.

The entrance plate 1 of the conveying threshing device 3 serves as a grain culm in a fallen position that receives and supports the tip of the grain at a location on the upper side of the conveying direction than the conveying device 7.
A tip passing position detection mechanism 15 that detects whether the tip passing position of the grain culm at four locations is within a set range.
is provided. This detection mechanism 15 is configured such that the two normally open switches 15A and 15B are turned on and operated when the operating pieces 15a and 15b are pressed against the grain culm, and the space between them is the grain culm tip. When the grain culms are arranged side by side in the longitudinal direction in a state where the proper range of passage is achieved, and only the switch 15B next to the stock head is turned on and operated, the state of passing through the proper range is detected, and both switches 15A and 15B are turned on and operated. and is configured to detect a state in which the appropriate range is not passed.

Based on the detection result of the set range non-passing state by the ear passing position detection mechanism 15, the program state in the control mechanism for changing the posture of the conveying device is automatically corrected so as to suppress deviation of the grain culm tip from the set range. A voltage motor 16 is provided as a correction means for this purpose. This motor 16 is configured to correct the program state by operating a volume 19 for generating a voltage signal to be added to the detection mechanism 9 for the comparison circuit 10, and is configured to correct the program state. The drive relay 16a and the reverse drive relay 16b are connected to the switch 15A,
15B and the pulse signal generating circuit 17 via AND circuits 18a and 18b.
When the tip passing position gradually deviates from the set range, the motor 16 is intermittently driven in the normal direction, and the voltage generated by the volume 19 is sequentially increased.
Conversely, when the stock is out of position, the motor 16 is intermittently driven in reverse, and the voltage generated by the volume 19 is gradually reduced.

Further, a switch 20 connecting the pulse signal generating circuit 17 and the AND circuits 18a and 18b has an operating piece 20a connected to the tip passing position detecting mechanism 1.
When pressed due to the presence of the target grain culm in No. 5, the input operation is performed, and when the pressure is released due to the absence of the grain culm, the cut operation is performed. With this structure, the transmission motor 16 is operated to detect the ear passing position. Based on the presence/absence detection result of the target grain culm of the mechanism 15, it automatically switches to the operable state when the grain culm is present and to the stopped state when the grain culm does not exist, and when the grain culm is not present, the immediately preceding correction signal is activated. output (volume 1
It is configured as an error movement prevention means that maintains the generated voltage (voltage 9).

Incidentally, in carrying out the present invention, for example, the drive mechanism 1
Various changes can be made to the program state correction means, such as correcting the program state by changing the position of the entire culm length detection mechanism 9 in the grain culm longitudinal direction in step 6.

Although reference numerals are used in the claims section for convenience of comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

The drawings show an embodiment of the handling depth control device for a combine harvester according to the present invention, and FIG. 1 is a side view of the front part of the combine, FIG. 2 is a front view showing the attachment part of the culm length detection mechanism, and FIG. 3 is a threshing FIG. 4 is a front view showing the inlet plate portion of the device and a circuit diagram. 3... Threshing device, 7... Handling depth adjustment device, 9...
...Culm length detection mechanism, 15...Tip passing position detection mechanism.

Claims (1)

[Claims] 1 Culm length detection mechanism 9 of the drawn grain culm and threshing device 3
a handling depth adjustment device 7 that adjusts the tip position of the grain culm supplied to the grain culm based on the culm length detection result of the culm length detection mechanism 9 to obtain an appropriate handling depth; Near the entrance of the threshing device 3, there is provided a tip passing position detection mechanism 15 for a side-falling grain culm in which the tip is received and supported, and the tip passing position detection mechanism 15 is used to detect removal of the tip from the proper passing position. In the combine handling depth control device comprising a correction means for outputting a correction signal of the culm length detection result based on the culm length detection result, the head passing position detection mechanism 1
A handling depth control for a combine harvester, characterized in that a malfunction prevention means is provided for detecting the presence or absence of a grain culm at the detection position of No. 5 and maintaining the output of the immediately preceding correction signal when a grain culm is absent. Device.