JPS5847127B2 - combine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION In recent years, in combine harvesters, in order to operate the threshing device with an appropriate load, a means for automatically controlling the extraction performance based on the detection result of the threshing load has been considered.

However, when performing automatic control in this way, conventional methods continuously detect the threshing load and automatically and reversibly adjust the threshing performance based on this result so that the greater the load, the easier it is to handle. Since the control was carried out continuously, even if there was a sudden small load change, the retractability control was carried out immediately. It was becoming difficult to control.

The present invention aims to solve the above-mentioned problems and provide a combine harvester that can stably control the extraction performance, and its technical feature is a culm length detection device that detects the culm length of the shell culm to be threshed. and a pullability adjustment device that changes the pullability of the shell culm supplied to the threshing device based on the culm length detection result by the culm length detection device, in which a threshing load in the threshing device is detected. In addition, the culm length detection device is provided with a plurality of detection action areas whose detection ranges are mutually different in the culm length direction, and the culm length detection device and the load detection device are The switching mechanism selects the detection area of any one of the culm length detection devices based on the detection result of the threshing load by the load detection device, and the switching mechanism selects the detection area of the threshing load detected by the load detection device. The detection area is selected in such a range that the larger the culm length is, the shorter the appropriate culm length is. , has the following effects.

In other words, since handling depth control based on the threshing load is performed in stages, even if the load suddenly changes by a small amount, handling depth control will not be performed immediately. Based on this, the handling depth can be changed and adjusted in stages to stabilize the load.

In other words, step-by-step control makes it possible to provide a dead zone effect against sudden and unexpected load fluctuations, and it is possible to perform stable control without frequent handling depth control.

Furthermore, even at each handling depth stage according to the threshing load, if a change in culm length occurs that does not significantly change the load, control is performed to maintain the handling depth within a predetermined range, resulting in an increase in broken straw due to deep handling. It has also become possible to perform good threshing processing by reducing unhandled grain due to shallow handling.

Hereinafter, embodiments of the present invention will be described in detail based on illustrative drawings. FIG. 1 shows that a reaping pre-processing section is connected to the front part of a machine in which a threshing device 2 is mounted on a crawler traveling device 1. Shows the combined harvester it will be equipped with.

The reaping pre-processing section uses a front pulling device 3 to pull up a plurality of planted stem culms, and a reaping device 4 to harvest the base end of the plant, and then
As shown in FIG. 2, the auxiliary conveyance device 5 transports the harvested stem culms in one horizontal direction while merging them, and the merging stem culms are deflected with the tip side toward the inside of the body rather than the base side. The head locking and conveying device 6a and the stock head clamping and conveying device 6b are supported in a tilted position.
After conveying the stem rearward by a vertical conveyance section 6 consisting of a vertical conveyance section 6 and changing the attitude to a sideways posture at the end of conveyance, the base of the stem culm is delivered to the feed chain 7 of the threshing device 2. .

The feed chain 7 is configured to clamp and convey the stem culm while a handling cylinder 8 installed in the threshing device 2 handles and threshes the tip of the stem culm.

The ear tip locking and conveying device 6a and the stock head clamping and conveying device 6b are pivotally connected at their rear end sides, and their front ends are supported by the auxiliary conveyance device 5 as the hydraulic cylinder 9 expands and contracts. The stem culm is configured to swing in a state of shifting along the culm length direction, and as a result, the holding position of the stem culm delivered from the auxiliary conveyance device 5 is changed in the culm length direction along with this vertical swing. The culm is configured to change the insertion amount of the culm inserted into the threshing device 2 while being pinched and conveyed by the feed chain 7, so-called handling depth adjustment.

In addition, in this combine harvester, as the load on the threshing device 2 increases or decreases from a constant value, the threshing load is stabilized by switching to the shallow handling side and the deep handling side in two stages, and in each control state, In order to maintain the handling depth within a set range, it is constructed as described below.

That is, as shown in FIG.
A curved frame 10 for supporting the stock clamping rail 6' of the stock clamping and conveying device 6b, which is disposed so as to bypass the tip of the shell culm being transported at a, is provided with a culm length of the transported shell culm. Equipped with an electrical detection mechanism.

This detection mechanism consists of a case 1 attached to the frame 10.
1 has three swing sensors 12a, 12b, 12c pivoted along the culm length direction, and when each sensor 12a swings when pressed by the culm, it is activated by a normally closed electric switch. S1. S2. It is configured to be detected at S3.

Additionally, a normally open switch S4 is also provided on the stock clamping rail 6'.
A rocking sensor 12d equipped with this is equipped.

On the other hand, as shown in FIG.
A torque detection device 14 is equipped.

Each of the switches S1... and the torque detection device 14
As shown in FIG. 4, the hydraulic cylinder 9 is connected to an electromagnetic three-position switching valve (■) that expands, contracts, and fixes the hydraulic cylinder 9, and the detected value from the torque detecting device 14 is compared by a comparison mechanism 15 to maintain a constant value. It is configured to detect whether it is smaller or larger than the value, and to switch accordingly between a deep handling state using the rocking sensors 12a and 12b and a shallow handling state using the rocking sensors 12b and 12c. ing.

In other words, in the deep handling state, when the tip of the shell culm exceeds the first sensor 12a, the switch S1 is opened and the solenoid of the changeover valve (2) is activated to perform control to the shallow handling side. 2, when the tip of the culm is removed below the sensor 12b, the solenoid of the switching valve is activated by closing the switch S2, and the deep handling side control is performed, and the tip of the culm is moved between the sensors 12a and 12b. In addition, in the shallow handling state, when switch S2 is opened, the shallow handling adjustment solenoid is activated, and when switch S3 is closed, the deep handling adjustment solenoid is activated, and the shell culm is Sensors 12b and 12c are attached to the tip of the ear.
The structure is configured to perform shallow handling control between the two.

Note that the bottom sensor 12d has a culm similar to the sensor 12a.
... is detected at the same time, and the switch S4 is closed to start the control circuit.

The present invention may be implemented by changing the handling depth to a relatively small number of stages, such as three or four stages.

In addition, when carrying out the present invention, when the handling depth reaches the limit,
A vehicle speed control mechanism may be incorporated to control the vehicle speed and change the amount of culm reaped per unit time.

[Brief explanation of drawings]

The drawings show an embodiment of the combine harvester according to the present invention, in which Fig. 1 is an overall side view, Fig. 2 is a schematic side view of a pre-reaping processing section, Fig. 3 is a rear view showing a curved frame portion, and Fig. 4. is an operating circuit diagram. 2... Threshing device.

Claims (1)

[Claims] 1. A culm length detection device 11 that detects the culm length of the shell culm to be threshed, and a culm length detection device 11 that changes the pullability of the shell culm supplied to the threshing device 2 based on the culm length detection result by the culm length detection device 11. A combine harvester equipped with an adjustment device 9 is provided with a load detection device 14 for detecting the threshing load on the threshing device 2, and the culm length detection device 11 has multiple stages with different detection ranges in the culm length direction. Furthermore, this culm length detecting device 11 and the load detecting device 14 are set to have a detection effect of any one of the culm length detecting devices 11 based on the detection result of the threshing load by the load detecting device 14. The switching mechanism 15 selects a detection action area in which the greater the threshing load detected by the load detection device 14, the shorter the appropriate culm length. A combine harvester characterized in that the rooting depth set by the extractability adjustment device 9 is set to be shallow.