JPH0126654B2 - - 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 handling depth that adjusts the culm length detection mechanism of the drawn grain culm and 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 make the handling depth appropriate. an adjustment device, and a mechanism for detecting a tip passing position of a side-down grain culm, the tip of which is received and supported, 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, which includes 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 this, the problem of detection errors due to drooping of the tip, which changes due to differences in variety, wetness, and fluctuations in the amount of grain deposited, can be solved, and the detection error can be substantially reduced. It is known that the handling depth is adjusted in a state where there is no handle (see, for example, Japanese Patent Laid-Open No. 160621/1983).

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 combine handling depth control device of the present invention detects the presence or absence of grain culm using the correction signal artificial setting means and the detection position of the ear passing position detection mechanism, and The present invention is characterized in that a switching means is provided for switching to the correction signal set by the artificial setting means when a culm is not present.

Therefore, according to the present invention, the following effects can be obtained. In other words, before starting reaping and harvesting work, the operator can check the field conditions in advance to understand the average degree of drooping of the ears, and then artificially set the amount of correction for the culm length detection results. Even when finishing a process and restarting the next process of reaping and harvesting, the culm length immediately after the start of reaping can be accurately predicted using the preset correction amount, and the culm length immediately after the start of reaping can be automatically predicted. The handling 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. Moreover, especially according to the present invention, the configuration for accurately predicting the culm length is very simple and can be easily implemented.

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

As shown in Fig. 1, the front part of this machine is equipped with a crawler traveling device 1 and a device 3 for threshing grain while holding and transporting the grain culm stock with a feed chain 2 installed on one side. , a device 4 for raising 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 backwards, and an upright position to be delivered from now on. A reaping processing section is connected thereto, which includes a rear conveyance device 7 that conveys the grain culms rearward and upward, changes the posture to a collapsed position at the end of the conveyance, and supplies the grain to the threshing device 3. Then, as the process progresses, the target grain culm is raised and harvested,
It is configured to automatically and continuously perform the work of sequentially threshing the harvested grain culms.

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 changes the support position of the grain culm delivered from the auxiliary conveyance device 6 in its longitudinal direction, and changes the grain culm supply position to the feed chain 2 in the grain culm longitudinal direction. It is configured.

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;
In addition, a culm length detection mechanism 9 is 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, 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 that are individually turned on and operated 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 from the potentiometer 8 and the voltage signal from the culm length detection mechanism 6, the conveying device maintains these voltage signals in a preset relationship in order to maintain a constant handling depth. A program control mechanism is provided for automatically swinging up and down 7.

That is, the setting relationship of the voltage signals is set to be appropriate when the difference between these signals is within the setting tolerance, and a circuit 10 for comparing both the signals is provided, and a Based on a signal, a circuit 11a that determines that the transport device 7 needs to be swung upwards and a circuit 11b that determines that the transport device 7 needs to be swung downwards are provided. A hydraulic cylinder 18 is provided for swinging the conveying device 7 upwardly when it is extended and downwardly when it is shortened, and an extension operation operating section of the electromagnetic control valve 12 that switches the operating state of the cylinder 18. 12a and the shortening operation operation section 12b are connected to the upward swing discriminating circuit 11a and the downward swing discriminating circuit 1.
It is configured to be operated by a signal from 1b.

As a grain culm that receives and supports the tip portion at a location on the upper side of the conveyance direction than the conveyance device 7,
The two switches 14A and 14B, which detect whether or not the grain tip passing position of the grain culm at 13 locations on the entrance plate of the conveying threshing device 2 are within a set range, are operated by the grain culm in a state in which the grain culm longitudinal direction is operated. These switches 14A, 14B are arranged in parallel in the direction.
However, this is incorporated into the electric circuit of the control mechanism for changing the posture of the conveying device to configure a ear passing position detection mechanism so as to suppress the deviation of the grain culm tip from the set range. Specifically, the two switches 14A and 14B are of a normally open type, and
The operation pieces 14a and 14b are configured to be operated when pressed against the grain culm, and the grain culm is located between the switch 14A located on the side of the grain tip and the switch 14B located on the side of the stock. It is installed so that the tip can pass through the appropriate range. and,
A circuit 15 for these switches 14A and 14B to generate a voltage signal to be applied to the comparison circuit 10.
When the tip passing position deviates from the set range toward the tip or the stock end, a correction means is incorporated in which a voltage signal higher or lower than that given in the proper passing state is given to the comparator circuit 10. It consists of Then, the signal obtained by adding the signal from the voltage signal generation circuit 15 and the signal from the detection mechanism 9 is compared with the signal from the potentiometer 8, and the handling depth is corrected. It is configured so that

In addition, 16 in the figure connects the comparison circuit 10 and the voltage signal generation circuit 15 when the operating valve 16a is pressed at the grain culm stock base located on the inlet plate 13, and the pressing operation is released. The voltage generating volume 17, which is a switch serving as a switching means that releases the connection when the connection is released, and which is manually operated in the disconnected state is a specific example of the artificial setting means of the present invention, and is a switch that releases the reaped grain after the start of reaping. Until the culm is conveyed to the entrance plate 13, a voltage signal is given to the comparator circuit 10 in place of the voltage signal generation circuit 15, and the setting is changed in advance by the operator.

Incidentally, although reference numerals are written in the claims section for convenient 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 installation part of the culm length detection mechanism, and FIG. 3 is a switch. The front view of the mounting part and FIG. 4 are circuit diagrams. 3... Threshing device, 7... Conveying device for adjusting handling depth, 9... Culm length detection mechanism, 14A, 14B... Ear tip passage 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 14A, 14B for side-falling grain culms in which the tip is received and supported, and the tip passing position detection mechanism 14A, 14B detects the tip from the proper passing position. In the combined handling depth control device, the combine harvester handling depth control device includes a correction means for outputting a correction signal of the culm length detection result based on the detection of deviation of the culm. A handling depth control device for a combine harvester, comprising a switching means 16 for detecting the presence or absence of a grain culm at a detection position and switching to a correction signal set by the artificial setting means 17 when a grain culm is absent. .