JPS6040802B2 - Cutting height control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cutting height control device for a mobile working machine such as a combine harvester having a divider and a cutting blade.

Conventionally, combine harvester cutting height control devices have installed sensors near the cutting blades, but the field is rough at the end of the field where the combine turns, so when the next cutting begins after turning, the cutting blades Sensors placed nearby could not quickly respond to head dips or head downs due to unevenness in the field, resulting in high mowing or the divider pushing into the field.

Additionally, by installing a sensor at the divider position at the front of the machine, it is possible to quickly raise and lower the preprocessing section depending on the field situation. Since the value is greatly amplified,
Excessive lifting and lowering may lead to hunting in the pre-processing section.
Appropriate cutting height control could not be performed. Therefore,
The present invention provides a front mowing height sensor in the divider part and a rear mowing height sensor near the cutting blade, and switches these two sensors using a grain detection sensor, so that the rear mowing height sensor is not used during normal mowing work. It is an object of the present invention to provide a cutting height control device which is configured to be controlled by a height sensor, and controlled by a front cutting height sensor when the grass is not being conveyed, thereby eliminating the above-mentioned drawbacks. That is.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.

As shown in FIG. 1, the combine 1 consists of a pre-processing section 2, a threshing section 3, a traveling section 5, and an operating section 6. Supported.

In addition, a divider frame 10 is provided in front of the preprocessing section 2.
A divider 11 is provided by the frame 1.
A cutting blade 12 is arranged behind the cutting blade 0. Furthermore, the divider frame 101 is provided with a front cutting height sensor 13a in the divider 11 portion, and a rear cutting height sensor 13b in the vicinity of the cutting blade 12. These front and rear mowing height sensors 13a and 13b have a similar configuration, as shown in detail in FIG. switches 16a, 16b and 17a,
17b. Further, the pre-processing section 2 has a grain conveying chain 18, and a grain detecting sensor 20 which is activated by the grain grains is provided in the conveyance path of the chain 18. The cereal grain detection sensor 201, as shown in FIG. ``Limit switch 2''
Activate 5. Next, based on FIG.
Explain the hydraulic circuit.

The circuit has a manual automatic changeover switch 26, and has a manually operated up switch 27a and down switch 27b on the manual side contact a side. A limit switch 25 of the grain detection sensor 20 is interposed on the automatic side contact b side, and when the switch 25 is in contact with the grain grain, the switch 25 is connected to the contact b on the rear cutting height sensor 13b side, and the switch 25 is If the cutting edge is not touched, the contact point a is switched to the front cutting height sensor 13a side. Each cutting height sensor 13a, 1
3b has up switches 16a, 16b and down switches 17a, 17b, respectively, and each up switch 2
7a, 16a, 16b are connected to the ascending side solenoid 28a of the solenoid valve 28, and each descending switch 27b, 17
a and 17b are respectively connected to the descending side solenoid 28b. The solenoid valve 28 is supplied with oil from a hydraulic pump 30' under reduced pressure by a relief valve 31, and is also pumped into a tank 32. Therefore, by switching the valve 28, pressure oil can be sent to the hydraulic cylinder device 7 or oil can be discharged from the hydraulic cylinder device 7. In addition, in the figure, 33 is a battery, and 35 is a filter. Since the present invention has the above-described configuration, when the combine harvester 1 is in the row and the combine harvester 1 is in the row and normal mowing work is being carried out during the automatic cutting height control operation in which the automatic changeover switch 26 is switched to the automatic side contact b. If so, cutter blade 1
The grain stalks cut in step 2 are transported by the conveyor chain 18, and therefore the grain stalks are transported by the sensor arm 22 of the grain grain detection sensor 20.
is spread in contact with the grain stalk, and the limit switch 25 is switched to contact b.

As a result, the combine harvester 1 uses the rear cutting height sensor 13b.
The ground height is detected at a position close to the cutting blade 12. That is, when the sensor arm 15b is located at the position A in FIG.
closes the switch 17 and closes the solenoid valve 28.
The descending solenoid 28b is energized to close the valve 28, the hydraulic cylinder device 7 is passed through the oil tank 32, and the pretreatment section 2 descends while discharging the oil in the cylinder due to its weight. Further, when the sensor arm 15b is located at the position shown in FIG. Pressure oil is fed by the hydraulic pump 301 to the device 7, the hydraulic cylinder device 7 is extended, and the pre-processing section 2 is raised. In this way, when the pre-processing section 2 reaches a proper height, the sensor arm 15b is located at the opening in FIG. 2, and both switches 16b and 17b are not activated, and the sensor arm 15b is maintained at that height. When the combine 1 reaches the headland, stops normal reaping work, and turns around, no grain is sent to the conveyor chain 18, so the limit switch 25 of the grain detection sensor 20
is switched to the contact a side. This state continues until the combine 1 starts reaping work and the grain is transported to the hard grain detection sensor 20 by the conveyor chain 18.
The height above the ground of the combine 1 is detected by a front cutting height sensor 13a located in the divider 11 portion at the front of the machine body. As a result, as described above, depending on the position of the sensor arm 15a, the ascending switch 16a or the descending switch 1 is activated.
7a is activated and the solenoid valve 28 is operated to control the cutting height. When the grain is brought to the grain detection sensor 20 during the reaping operation, the limit switch 25 is switched to the contact b side, and the combine harvester 1 is again controlled by the rear cutting height sensor 13b. As explained above,
According to the present invention, when the combine harvester 1 is in the middle of a row and is performing normal cutting work, the cutting height is controlled by the rear cutting height sensor located near the cutting blades 12. It is possible to obtain an appropriate cutting height, and to prevent hunting when raising and lowering the pretreatment section.

In addition, from the time of turning until immediately after the start of the next reaping operation, the front cutting height sensor located on the divider 11 at the front of the machine is controlled, so when starting the reaping work again after turning, the Even if the rear mowing height sensor 13b is positioned in a field that is rough due to turning, the front mowing height sensor 13a is located in the row, and the head or the head may be raised due to large irregularities in the field. It is possible to quickly respond to the down and control it to the appropriate position, and it is possible to prevent the divider 11 from cutting at a high height and from pushing the divider 11 into the field. Furthermore, since the above-mentioned front cutting height sensor 13a and rear cutting height sensor 13b are automatically switched by the grain stem detection sensor 20, there is no yielding operation and the switching can be performed reliably and appropriately.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a combine harvester to which the present invention is applied, Fig. 2 is a side view showing a cutting height sensor, Fig. 3 is a plan view showing a grain detection sensor, and Fig. 4 is a side view showing a combine harvester according to the present invention. This is an electrical/hydraulic circuit diagram. 1... Combine harvester, 11... Divider, 12... Cutting blade, 1
3a...Front mowing height sensor, 13b...Rear mowing height sensor, 20...Kazusa detection sensor. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. In a mobile working machine such as a combine harvester having a divider and a cutting blade, a front cutting height sensor is provided in the divider part, a rear cutting height sensor is provided near the cutting blade, and both sensors are used as a grain culm detection sensor. The mowing height is controlled by the rear mowing height sensor during normal mowing work, and by the front mowing height sensor when grain culms are not being conveyed. Device.